WO2000065140A1

WO2000065140A1 - Ground fabric for tufted carpet and tufted carpet made using the ground fabric

Info

Publication number: WO2000065140A1
Application number: PCT/JP2000/002685
Authority: WO
Inventors: Atsushi Matsunaga; Tomoko Watanabe; Mamiko Matsunaga
Original assignee: Unitika Ltd.
Priority date: 1999-04-26
Filing date: 2000-04-25
Publication date: 2000-11-02
Also published as: JP4623833B2; DE60042394D1; EP1130149B1; EP1130149A1; EP1130149A4; KR20010053138A

Abstract

A ground fabric for use in tufted carpets; and a tufted carpet made using the ground fabric. The ground fabric is constituted of a nonwoven fabric made of long fibers of a polylactic acid polymer. The long fibers have a circular cross section and have a birefringence of 12x10-3 to 30x10-3 and a crystallinity of 15 to 25 wt. %. The long-fiber nonwoven fabric has a thermal shrinkage through 3-minute heating at 120 °C of 1 % or lower in each of the MD and the CD. In the case of using long fibers having a different cross-sectional shape, these long fibers have a crystallinity of 15 to 25 wt. % and the nonwoven fabric made of these has a thermal shrinkage through 3-minute heating at 120 °C of 1 % or lower in each of the MD and the CD.

Description

TECHNICAL FIELD The technical field of tufted carpet and the tufted carpet using this fabric

TECHNICAL FIELD The present invention relates to a base fabric for evening sleeving force made of a nonwoven fabric in which a group of long fibers are accumulated, and a tufted carpet using the base fabric. Background art

A nonwoven fabric in which a large number of long fibers are accumulated is used as a base fabric for evening carpet. A well-known tufted carpet base fabric is used as a support when tufting is performed by implanting a pile yarn into this base fabric, and is mainly made of a nonwoven fabric made of polyethylene terephthalate. Is formed.

Tufted carts become bulky garbage when they are no longer needed, making it difficult to dispose of them. In the case of disposal by incineration, the high burning power reduces the useful life of the incinerator and generates toxic gas and black smoke. If disposed of by landfill, it will not rot and will have a negative impact on the environment. When polyvinyl chloride is used as the backing material provided on the carpet, incineration generates dioxin.

In recent years, recycling of synthetic fibers has been focused. However, in the car-bet, a pile is provided on the base cloth, and this S cloth (the reverse of the pile in A backing material is provided on the side surface to prevent the pile from coming off, and there is also a structure in which the backing material is covered with a secondary backing, and each is not made of the same material. Difficult to do. Summary of the Invention

The present invention solves the above problems and provides a tufted carpet base fabric and a tufted carpet using the base fabric, which do not cause a problem in a natural environment when they are no longer needed. With the goal.

To achieve this goal, the tufted carpet ffi fabric of the present invention is composed of a long-fiber nonwoven fabric formed of a polylactic acid-based polymer, and the long fibers have a circular cross section and a birefringence. rate is ^{1 2 X 1 0- 3 ~ 3} 0 X 1 0 - 3 der Li Kui crystallinity of 1 5-2 5% by mass is, the Tafute'Dokape' preparative base fabric, 1 2 0 ° C The heat shrinkage in 3 minutes is less than 1% in both MD and CD directions.

The tufted carpet river base fabric of the present invention is composed of a long-fiber nonwoven fabric formed of a polylactic acid-based IR union, and the long fibers have an irregular cross-sectional shape and a crystallinity of 15 °. The heat-shrinkage rate of the base material for tufted carpet at 120 t: for 3 minutes is 1% or less in both MD and CD directions.

A tufted carpet of the present invention includes the above-described base cloth. Further, it is preferable that the carpet has a configuration in which a pile yarn formed of a polylactic acid-based polymer is tufted on a base fabric, and the pile yarn in the base fabric is tufted. and has a Thus the side opposite to the side, out of Roh Kkingu material formed by wood charge having biodegradability is ^provided; _t- Therefore, according to the present invention, since the base fabric of the tufted carpet is constituted by a long-fiber nonwoven fabric formed of a polylactic acid-based ffl coalescence, it has the required biodegradability and poses a problem in the natural environment. As is clear from the chemical structure of polylactic acid, the rigidity is higher than that of polyester and the like. Therefore, when tufting is performed on this base cloth, the tuft needles are used as the constituent fibers of the base cloth. The fibers are less likely to pierce directly into the needle, allowing the fibers to escape from the needle, thereby reducing the damage to the fibers and maintaining the mechanical strength of the base fabric after tufting. Further, when a tile carpet, for example, is formed as a final product, the tile carton has rigidity, and workability such as laying on the floor is improved. The long fiber has a degree of crystallinity of 15 to 25% by mass, and when the long fiber has a circular cross section, the birefringence of the long fiber is 12 × 10 10 — ^³ ~ ³ 0 X 1 0- ³ der because, while providing an appropriate rigidity, the fiber structure polymer has sufficiently molecular orientation, thus dimensional method stability was also excellent in mechanical properties Becomes In addition, since the base fabric of the present invention has excellent thermal stability, in the backing step, the heat when laminating or coating the knocking material or the heat after laminating the backing material are used. A sufficient dimensional stability can be obtained without shrinking due to heat generated when the backing material is hardened by drying in an oven. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic diagram ^ showing an example of a cross section of a multi-leaf type composite filament constituting the base fabric of the present invention ^, and

Figure 2 shows the cross section of the multi-filament composite long fiber that constitutes the S cloth of the present invention. It is the schematic diagram which showed another example. Disclosure of explanation

The backing fabric for evening foot of the present invention is composed of a long-fiber nonwoven fabric formed of a polylactic acid-based polymer. The polylactic acid-based polymer is superior to other polymers in terms of biodegradability, spinning properties, and the like. Also, as is clear from the chemical structure of polylactic acid, it has higher rigidity than polyester and the like. For this reason, when performing tufting on the base fabric, the tufted needles are less likely to pierce directly into the constituent fibers of the base fabric, and the fibers can escape from the needles. As a result, the mechanical strength of the base fabric after tufting can be maintained. Further, for example, when a tile carbet is formed as a final product, the tile force unit has rigidity, and workability such as laying on the floor is improved.

Examples of polylactic acid-based polymers include poly (D-lactic acid), poly (L-lactic acid), a copolymer of D-lactic acid and L-lactic acid, a copolymer of D-lactic acid and hydroxycarboxylic acid, and a copolymer of L-lactic acid and hydroxide Among the polymers selected from the group consisting of a copolymer of roxycarboxylic acid and a copolymer of D-lactic acid, L-lactic acid and hydroxycarboxylic acid, a polymer having a melting point of 100 or more is preferred. Thus, a blend of polymers having a melting point of 100 ° C. or more is also suitable. For example, poly (L-lactic acid) and poly (D-lactic acid), which are homopolymers of polylactic acid, have a melting point of about 180 ° C. However, when the above-mentioned co-Si union is used as a polylactic acid-based polymer, It is preferable to determine the copolymerization ratio of the monomer components so that the melting point of the copolymer is 12 Ot: or more. And, for this purpose, D lactic acid L lactic acid (copolymer molar ratio) is〗 0 It is preferably 0/0 to 90Z10, 1o, zy0 to 0Z1oo.

In the case of a copolymer of lactic acid and hydroxycarboxylic acid, the hydroxycarboxylic acids include glycolic acid, hydroxybutyric acid, hydroxyvaleric acid, hydroxypentanoic acid, and hydroxycaproic acid. And hydroxyheptanoic acid, hydroxyoctanoic acid and the like. Among them, it is particularly preferable to use hydroxycaproic acid or glycolic acid from the viewpoint of low cost.

In the present invention, the long fibers of polylactic acid polymer is cross而形shape when a circular birefringence ^{1 2 X 1 0- 3 ~ 3} 0 X 1 0 - crystallized with a ³ The degree is 15 to 25% by mass. Here, “circular” means a circle whose birefringence can be measured.

While birefringence shows a degree of molecular orientation, which is less than 1 2 X 1 0- ^3, also the degree of crystallinity is less than 1 5% by weight, the molecular orientation of the polylactic acid constituting the fiber Is not enough, and the crystallinity is too low, so the residual affinity of this fiber increases. As a result, the obtained nonwoven fabric, that is, the base fabric, tends to have poor dimensional stability and mechanical properties. In addition, since it lacks heat stability, it cannot withstand the high temperature of the backing process in the later-described car- tet manufacturing process, and the base fabric shrinks, resulting in excellent dimensional stability. You will not be able to get a car. Therefore, if the above properties are not satisfied, it is not suitable as a base fabric for evening carpet.

On the other hand, if the birefringence exceeds ³⁰ X 10-3 and the crystallinity exceeds 25% by mass, the resulting nonwoven fabric has excellent dimensional stability, mechanical properties and thermal stability, but the fiber Stiffness is too high, And For this reason, damage by the tufting needle in the tufting process ignites, and the strength retention after tufting decreases. Further, for example, when thermoforming is required for the tufted carpet of the present invention, it becomes difficult to perform molding.

If the cross section of the long fiber is irregular, the birefringence cannot be measured, so only the crystallinity is specified. The range is 15 to 25% by mass as described above. The significance of this category is the same as above.

In the present invention, the birefringence is measured using a polarizing microscope equipped with a Berek compensator and using tricresyl phosphate as an immersion liquid.

The crystallinity is measured by the following method. That is, the long fiber to be measured is powdered and filled into an A1 sample frame (20 × 18 × 0.5 mm) to form a sample. Then, the sample held in the vertical direction is irradiated with a Cu—Κα ray from a right angle direction by a RAD-rB type X-ray generator manufactured by Rigaku Corporation. A curved graph-eye monochromator is used on the light-receiving side. Then, scanning is performed in the range of 2Θ = 5 to 125 degrees, and the crystallinity is calculated as a mass percentage by the Ru1aId method.

The base fabric of the present invention is required to have a heat shrinkage rate at 120 C for 3 minutes of 1% or less for both MD (machine direction) and CD (direction perpendicular to machine direction). This is because, as described later, the tufted carbet has a pile thread tufted on a base cloth, and a backing material is provided for fixing the tufted pile thread on the base cloth. Usually involves extruding a hot, molten backing material A process such as laminating the base fabric is performed, and then the backing material is put into an oven to dry it and dried.However, when the heat shrinkage exceeds 1%, the base fabric is dried. However, it is because it is not possible to withstand high heat when performing the process of providing the backing material as described above, and it is not possible to obtain a force unit having good dimensional stability due to contraction. When a post-dyeing process is applied to a carpet, heat of 100 ° C or more is applied by steam in the dyeing process at that time. This is because it is not possible to obtain a cartridge having good dimensional stability.

The form of the long fibers of the nonwoven fabric constituting the base fabric of the present invention may be a base phase composed of a single polylactic acid-based polymer or a composite form composed of a plurality of polymers. Examples of the composite form include a core-sheath type, a side-by-side type, a sea-island type, and a multi-leaf type. Among them, the single-phase type, the core-in-sheath type, the side-by-side type, and the sea-island type can adopt both circular and irregular cross-sections due to their cross-sectional structures. On the other hand, the multi-leaf type can take only an irregular cross-section due to its cross-sectional structure.

Since single-phase long fibers do not have a low-melting-point β complex which is one component of a binder described later, a base fabric having a low heat shrinkage can be obtained.

The long fibers in the composite form are formed by a low-melting polymer and a high-melting ffi-copolymer, and the high-melting polymer has a melting point 20 ° C or more higher than the melting point of the low-melting polymer, and a low-melting polymer. It is preferred that some of these are present on the fiber surface. In the case of such a composite-form long fiber, the low-melting-point polymer softens or melts during the heat treatment for forming the nonwoven fabric, and the constituent fibers are fused and joined. Maintains fiber morphology unaffected. As a result, the obtained long-fiber nonwoven fabric has the form Retains mechanical properties such as retention and tensile strength, and is excellent in flexibility.During tufting of pile yarn, the resistance when the tuft needle penetrates the heat-sealed part becomes small and easy to penetrate. .

The composite ratio of the high-melting polymer and the low-melting polymer of the composite fiber is (high-melting polymer) Z (low-melting polymer) = 90 Z 10-] 0/90

(Mass ratio) is preferred. If the composite ratio of the high melting point polymer is less than _! 0%, the low melting point component is too large.For example, when forming into a nonwoven fabric by hot pressing, depending on the hot welding temperature, the hot pressing process may not be possible. There is a possibility that meltability of the fibers will adhere to the hot pressing rolls and other parts of Ushikawa and significantly impair operability. If the composite ratio of the high-melting point IE is less than 10% and the low-melting-point component is too large, the ratio of the low-melting-point polymer in the hot-press junction becomes too large, and the adhesion between fibers becomes strong. Too low fiber freedom. Then, at the time of tufting, the fiber is cut without being able to follow the tufted needle, and the mechanical strength of the tufted carpet base fabric is inferior, and the performance required for the carpet base fabric cannot be satisfied. There is a risk. On the other hand, if the composite ratio of the high-melting polymer exceeds 90%, the low-melting component is too small and the adhesion between fibers is insufficient. For this reason, the mechanical properties of the obtained nonwoven fabric are inferior, and the effect that the fiber has a low melting point ffi coalescence cannot be obtained. For this reason, it is more preferable that (melting point ffi merging) Z (low melting point polymer) = 70/30 to 30 Z 70 (mass ratio).

It is preferable that the low-melting-point polymer and the melting-point polymer have compatibility. For example, D-lactic acid and ZL-lactic acid are copolymers having different molar ratios. The combination and the high melting point polymer are polylactic acid and the low melting point IT (the union is a combination of lactic acid and hydroxycarboxylic acid). Stringing, which is united, is exemplified.

Optional addition of an anti-glazing agent, a pigment, a flame retardant, an antifoaming agent, an antistatic agent, an antioxidant, an ultraviolet absorber, etc. to the above-mentioned polylactic acid-based polymer as long as the object of the present invention is not impaired. Things may be added.

In the case of the core-in-sheath type composite form, the high-melting-point ffi-combined material is disposed on the core portion, and the low-melting-point polymer which becomes one component of the binder during the heat treatment for forming the nonwoven fabric is disposed on the sheath portion. Is done. With such a configuration, only the sheath portion is melted or softened to bond the constituent fibers together during the heat bonding process for forming a nonwoven fabric. At this time, since the core portion retains the fiber form, even in the subsequent tufting step, even when the tufted needle hits the heat-bonded portion of the sheath portions and the bonded state is released, the base cloth is not damaged. The strength does not decrease much. When the tufted needle hits the constituent fibers, the sheath on the fiber surface is damaged, but the core inside the fiber is not damaged. For this reason, the damage is smaller than that of the single-phase fiber, and the strength of the base fabric is less reduced.

Among the composite form long fibers, the multi-lobed type is described in detail below.

The cross-sectional shape of this multi-leaf conjugated long fiber is a multi-leaf cross section in which a high-melting-point union is arranged on the core and two or more low-melting-point polymers are arranged on the leaves. Two or more leaf parts exist as a plurality of convex parts on the fiber surface. With such a configuration, the metaphysical volume of the low-melting-point polymer, which is the adhesive component, increases, so that the number of contact points between fibers constituting the nonwoven fabric increases. Therefore, for example, when a non-woven fabric is formed by hot pressing, a sufficiently high adhesive strength can be obtained without applying high pressure, and as a result, a fabric with high tensile strength and intermediate tension can be obtained. . In addition, low melting point Since the body protrudes from the fiber surface in a convex shape, the melted or softened low-melting polymer easily enters the gaps between the fibers during the heat-welding process, and the low-melting ffi-merged substance is embedded in the fiber interstices. In addition to the strength of the nonwoven fabric in the vertical and horizontal directions, the strength of the nonwoven fabric in the thickness direction is also improved. When the strength in the thickness direction of the nonwoven fabric forming the base fabric is improved in this way, a tufted carton base fabric free from delamination in the evening step can be obtained.

The degree of protrusion and the shape of the leaves (convex portions) made of the low-melting polymer are determined by appropriately selecting the composite ratio of the high-melting polymer / low-melting ίβ-combination and the melt viscosity ratio. And can be changed.

The number of leaves of the multi-leaf type composite long fiber needs to be 2 or more, preferably 3 to 10, and more preferably 3 to 6. If the number of leaves is too large, the degree of protrusion of the protrusions on the leaves, that is, the fiber surface, becomes low, and the effect tends to be weakened.

FIG. 1 is a schematic diagram showing an example of a cross section of a multi-beam type composite long fiber constituting the base fabric of the present invention. The composite long fiber 1 has the high melting point polymer 2 in the core and the low melting point: coalescing 3 as two or more leaves. Both the high melting point polymer 2 and the low melting point polymer 3 are alternately exposed on the surface of the fiber 1. With such a cross-sectional structure, it is possible to adopt a configuration in which the high-melting point ffi coalescence 2 having a melting point considerably higher than the hot pressing temperature for forming a nonwoven fabric is partially exposed on the surface of the fiber 1, This has the advantage that even when the temperature at the time of hot pressing is raised to near the melting point of the low melting polymer 3, the softened or melted polymer is unlikely to adhere to the roll for hot pressing.

Figure 2 shows the cross section of the multi-lobed composite filament that constitutes the base fabric of the present invention. It is the schematic diagram which showed another example. In the example of FIG. 2, a leaf portion, which is a convex portion, is formed so as to surround the entirety of the low-melting point coalescing three-force high-melting point polymer 2.

The long-fiber nonwoven fabric can be prepared by a known method, for example, a spunbond method. In the second spunbonding method, long fibers are taken up by a melt spinning method, and the long fibers are deposited on a moving capture conveyor; Specifically, the polylactic acid ffi-combined is melt-spun from a normal spinneret, and the spun yarn is cooled, then towed by air soccer, and then spread by a known method. The web is deposited as a web on a mobile deposition device. The take-up speed at the time of towing by the air sucker is preferably, for example, about 300 to 600 mZ. If it is less than 300 mZ, the molecular orientation of the polylactic acid constituting the long fiber is not sufficiently large, and the tensile strength of the obtained long fiber becomes insufficient. The mechanical strength of the fabric tends to be poor. On the other hand, if it exceeds 600 mZ, the spinnability during melt spinning tends to decrease. When a fiber (unrolled intermediate yarn) having a molecular weight of less than 300 m / min and polylactic acid is not sufficiently oriented is obtained, the fiber is subjected to a rolling treatment or a heat treatment to obtain a fiber. By sufficiently distributing lactic acid, it is possible to obtain a long-fiber nonwoven fabric having a birefringence and a degree of yield according to the present invention.

Long-fiber nonwoven fabrics include single-phase long fibers composed of a single polymer, non-woven fibers composed of multiple long fibers composed of multiple polymers, and composite fibers composed of single-phase long fibers. Non-woven fabric mixed with long fibers, single-phase form; hi-fibers are composed of a polymer different from the polymer constituting the single-phase form fi fibers. If Can be

The fineness of the long fibers forming the nonwoven fabric is preferably 2 to 14 dtex. If the fineness is less than 2 decitex, the obtained long-fiber nonwoven fabric has a low strength, and the long fiber is cut when applying a needle punch to the nonwoven fabric or tufting the pile yarn as necessary. This tends to reduce the tensile strength of the base fabric at the time of forming a tufted carpet, even if it is compounded with a long fiber having a higher fineness. On the other hand, if it exceeds 14 decitex, the number of constituent fibers per base weight decreases, and the number of bonding points between fibers in the nonwoven fabric decreases, and the mechanical performance of the obtained long-fiber nonwoven fabric is impaired. In addition, the bonding points of the fibers in the nonwoven fabric are easily displaced, and the base fabric itself becomes rough and rigid, which may hinder the tufted force—the flexibility of the kit. As a result, the required performance cannot be satisfied.

The apparent density of the base fabric in the present invention is preferably 0.4 g Z cm ³ or less. If the apparent density exceeds 0.4 g Z cm ³ , the base fabric becomes very hard, and the resistance when the tufted needle penetrates the base fabric becomes large, making it difficult to penetrate. The lower limit of the apparent density, of the base fabric basis weight, considering the thickness, 0. Is preferably 0 8 g Z cm ³ approximately. If the apparent density becomes too small, the thickness of the base fabric becomes too large and the pile height required is increased in order to obtain a zero-weight base fabric that can hold tuft yarns sufficiently. The amount of pile to obtain is increased. For this reason, the force tends to be heavy, and the cost tends to be high. Good more preferable seen Kakemitsu degree, is 0. 1 ~ 0. 3 5 g Z cm 3.

The base fabric in the wood invention has fibers 同士 by needle punching. However, it is preferable that the entangled needle punched nonwoven fabric is used. Since the constituent fibers of the needle punched non-woven fabric are entangled not only in the two-dimensional direction but also in the thickness direction, the fabric does not peel between layers during tufting, and has good shape retention. Can be

The needle density at the time of needle punching is appropriately set depending on the kind and needle depth of the needle used, but it is generally preferable to be 20 to 100 times Z cm ² . If the needle density is less than ²⁰ times Z cm ² , the degree of entanglement between long fibers is low, and the effect of needle punching is not exhibited. On the other hand, when the needle density exceeds 100 times / cm ² , the force that intensifies the entanglement between the long fibers is severely damaged by the $ 21 needle, and the fibers themselves have extremely low strength. Therefore, the mechanical strength of the base fabric tends to be inferior.

In order to improve the stress at the time of elongation and the tensile strength, it is preferable to provide a fused portion in which constituent fibers are heat-fused to the base fabric which has been subjected to the needle punching treatment or not. As a method for heat-sealing the constituent fibers, a portion that passes through a hot embossing device consisting of a pair of embossing rolls or a hot embossing device consisting of an embossing roll and a flat roll and comes into contact with the convex portion of the embossing roll is used. The method of melting and fusing the constituent fibers of the base fabric, the method of passing between a pair of flat rolls, and the method of thermally fusing only the constituent fibers existing on the surface of the base fabric, or the intersection of the constituent fibers by blowing hot air And the like. Of the above methods, the method that passes the π-rule can adjust the thickness of the base fabric.

When the embossing roll is used, the constituent fibers are partially heat-pressed to each other. However, in this heat treatment, the press-contact temperature and the press-bonding ratio are overlapped. A factor.

The hot pressing temperature, that is, the set temperature of the roll, determines the melting point of the low melting point polymer.

As T m, (T m — 50) t: 〜 (T m — 5) ° C. If the heat-welding temperature is set to a value less than (T m — 50) X: the melting point of the low-melting polymer will be insufficient, and the adhesive strength between the fibers will decrease. When such a nonwoven fabric is used as a base fabric for a tufted carpet, the mechanical performance of the base fabric is inferior, and the bonding points between the fibers are easily detached by the impact of the tufted needle. As a result, delamination tends to occur in the base fabric, and only a base fabric having inferior performance can be obtained. On the other hand, if the heat welding temperature is set to a temperature exceeding (Tm-5) ° C, the molten low-melting polymer is fused to the heat welding rolls such as embossing rolls and flat rolls, resulting in marked operability. Be impaired. In addition, the set temperature of the roll is too high, and the high-melting polymer is melted or softened, and the obtained nonwoven fabric becomes too hard and coarse and rigid. Needle penetration resistance increases.

The pressed area ratio is 4 to 40%. The pressure contact area ratio refers to the ratio of the ffi contact portion to the entire area of the nonwoven fabric. If the press-contact area ratio is less than 4%, the area of the press-contact portion is too small with respect to the entire area of the non-woven fabric, so that the strength of the base fabric cannot be expected to be improved, and secondary such as tufting, dyeing, and backing is performed. The strength against the tensile stress acting on the base fabric during heating cannot be obtained. On the other hand, if the press-contact area ratio exceeds 40%, the degree of freedom of the fiber between the same tenths of the thermal pressure junctions decreases, and the fiber is cut without being able to follow the movement of the tuft needle at the time of tufting. The strength of the base cloth at the time of the deck cut will be inferior.

Heat) The part of the web that comes into contact with the It becomes a pressure contact part. Therefore, an embossing roll is used in which the height of the projections is 4 to 40% of the entire surface of the roll. The shape of the tip of the protrusion is the shape of the heat-pressed portion of the nonwoven fabric. The shape is not particularly limited, and may be a shape such as a round shape, an elliptical shape, a diamond shape, a triangular shape, a T shape, a well shape, an i-rectangle shape, and a square shape. The volume of the tip of each projection is preferably about 0.1 to 1.0 mm ² .

It is preferable that the linear pressure of the press roll during the heat press treatment is about 100 to 900 N / cm.

In the base fabric of the present invention, in order to improve the stress and tensile strength at the time of elongation β, a binder resin is adhered to the base fabric, and the contact points of the constituent fibers are adhered by the binder resin. This is preferred. It is preferable that the amount of the binder resin adhered (solid content adhered) is 2 to 15% by mass based on the total quality fi of the tufted carpet base fabric. If the resin adhesion amount is less than 2% by mass, the effect of providing the binder resin cannot be exhibited. On the other hand, if the adhesion amount exceeds 15% by mass, the amount of resin existing between the long fibers becomes too large, and when tufting the pile yarn, the degree of freedom of the fibers is lost, and the tufting needle is not used. It becomes difficult to penetrate the base cloth, and the flexibility of the obtained tufted carpet tends to be inferior. As such a binder resin, the polylactic acid-based polymer used for the base fabric described above can be suitably used. Further, polyvinyl alcohol, polysaccharides such as starch which is a natural product, protein, chitosan and the like may be used. Methyl acrylate, ethyl acrylate, butyl acrylate, methyl methyl acrylate, methyl methacrylate, ethyl methacrylate, butyl acrylate, acrylate Monomers such as lonitrile and styrene can be used. The total mass of Tafutetsu Dokape' preparative base fabric of the present invention, as appropriate; them Bayoi is arbitrarily generally preferred that that it is a 5 0 ~ 1 5 0 g Z m 2 in basis weight. If the basis weight of the base fabric is less than ⁵⁰ g / mz, the mechanical strength of the base fabric is reduced, and the holding power of the evening thread to the base fabric is reduced due to the small amount of fiber indigo in the base fabric. Te, while the easy tough bets yarn omission in Tufte ring, the basis weight is greater than 1 5 0 g / m ^2, with many fibers of the base fabric, irregular is tough Bok interval may become Pairu height uneven Easy to be. Also, it is not economical because of excessive performance.

In the tufted carpet of the present invention, a biodegradable tuft yarn is planted on the base fabric by tufting. Examples of the biodegradable fiber constituting the tuft yarn include a fiber made of a polylactic acid-based polymer, a fiber made of an aliphatic polyester, a natural fiber, a regenerated fiber, and the like, which are used in the above-described base fabric. Examples of natural fibers include cotton, wool, hemp, and the like, and examples of regenerated fibers include rayon, acetate, and solvent-spun rayon. When water absorption or touch is required, it is preferable to use cotton, wool, or regenerated fiber. Further, from the viewpoint of recycling, it is preferable to use the same material as the base fabric, that is, a polylactic acid-based polymer, and a bulky continuous yarn is particularly preferable as the tuft yarn.

In the tufted carpet of the present invention, the backing material is bonded to the backing of the base cloth in which the pile yarn is implanted, for the purpose of fixing the pile yarn and for the purpose of holding and reinforcing the carpet. More provided. As this backing material, well-known bitumen, ethylene vinyl acetate resin, polyurethane resin, and the like are preferable, and from the viewpoint of biodegradability, polyacid milk used in the above-mentioned base cloth is preferred. System or aliphatic Preferred are esters and the like. Examples of the method of providing the knocking material include a method of coating or impregnating the molten resin liquid on the base cloth, a method of applying a foamed resin liquid to the base cloth, and a method of foaming by drying. For example, a powder-dispersion method in which a resin is dispersed on the surface of a base fabric, and the resin is melted by heat and simultaneously fixed to the surface of the nonwoven fabric. Example

Hereinafter, embodiments of the present invention will be described in detail. However, the present invention this is. Al examples are not intended to be limited _u

The measuring method of each physical property value in the following examples is as shown below.

(1) Melting point (° C): Melting endotherm obtained by measuring the sample weight with a differential scanning calorimeter DSC-7 manufactured by PerkinElmer Model 5 with a heating rate of 20 as Z minutes. The temperature giving the maximum value of the curve was defined as the melting point (in). (2) Melt flow rate of polylactic acid (gZIO content): According to the method described in ASTMD 1238, a load of 21.17 N was applied under the condition of 210: The melt discharge amount when applied was measured, and the value was defined as the melt mouth rate (hereinafter, referred to as “MFR j”).

(3) MFR of polypropylene (gZ10 min): A 21.17 N load was applied at 230 ° C according to the method described in ASTMD 1238. The melt discharge amount at that time was measured, and the value was used as the MFR.

(4) Yarn production: The spun yarn was drawn by air soccer and evaluated in the following three stages.

〇: Thread break 0 问 ./Spindle per spindle · 1 hour △: Thread break less than 3 times / Spindle per spindle · 1 hour

X: Thread breaks 3 times or more Z per spindle weight · 1 hour

(5) Fineness (Decitex): The fiber diameter in the web state was measured with a 50-line microscope, and the average value obtained by density correction was defined as fineness (Decitex).

(6) With (g / m ^2): a longitudinal 1 0 cm X Horizontal] 0 cm sample piece from the standard state samples created 1 0 point, after the equilibrium moisture content, ¾ amount of each test piece (g ) were weighed, and the weight per unit area in terms of Ri per unit area and the average value of the obtained value (g Z m ^2).

(7) Crystallinity (% by mass): The long-fiber nonwoven fabric to be measured is powdered and filled into an aluminum sample frame (20 mm x 18 mm x 0.5 mm), and then this sample frame is placed vertically. And used as a sample. Then, the sample was irradiated with Cu—K rays from a right angle direction by a RAD—rB type X-ray generator manufactured by Rigaku Corporation. A curved graphite monochrome was used for the light-receiving side. Scanning was performed in the range of 26 = 5 to L25 degrees, and the degree of consolidation was determined as a mass percentage by the Ru1and method.

(8) Birefringence index (X 1 0- ^3): using a pair polarizing microscope equipped with a REC compensation Isseki one was measured Shikawa me re click Rejiruhosufue one Bok as the immersion liquid.

(9) KGSM strong (N / 5cm width): Using a constant speed medium length tester Tensilon RTM—50 mm manufactured by Toyo Ball Duin Co., Ltd., a rectangular shape with a width of δ cm and a length of 3 cm. The test pieces were measured at a grip distance of 20 (: m) according to the stripping method described in JISL 1106. The average value of 10 test pieces was determined, and this average value was calculated. Appendix 1 0 () gm ^The value converted per ² was defined as KGSM strength. The KGSM strength was measured for each of the MD direction (macliinedirection) and the CD force direction (cross clirection) of the base fabric.

(10) Heat shrinkage (%) of the base fabric: Five samples of 20 cm × 20 cm were prepared, and the lengths of three places were measured in each of the MD direction and the CD direction. The average value of the length in the MD direction is LM. The average value of the length in the CD direction is L C. And Then, heat treatment was performed in a hot air dryer at 120 ° C for 3 minutes under a constant length, and the dimensions of the sample after heat treatment were three places in the MD and CD directions in the same way as before heat treatment. Was measured. The average value of the length in the MD direction at that time was (LM,) The average value of the length in the CD direction was (LC,), and the thermal shrinkage of the base fabric was determined by the following equation.

M D heat shrinkage (%) = (L M. One L M,) / L Mo

Heat shrinkage in the CD direction (%) = (LC. One LC,) / LC

(11) Stiffness of base fabric (c c · cm Z cm ² ): Measured by the compression characteristics of the KES-FB test system. Specifically, five samples of 20 cm x 20 cm were prepared, the maximum load was first set, and the samples were placed on the sample stage. Then, the sample was compressed with a pressure plate at a speed of 1 mm Z 50 seconds, and the compression hardness obtained in this measurement was defined as the rigidity of the base fabric.

(12) Strength retention after tufting: Pile the tuft on the base fabric, measure the KGSM strength (N / 5 cm) of the tufted base fabric by the above method, and measure the strength after tufting. The strength retention was calculated by the following equation.

Strength retention rate (%) = (KGSM strength of base fabric after tuft) / (KGSM strength of base fabric before tuft) X 100

The strength retention of the base fabric was evaluated in the following three stages. ：: Good when the retention of strength after sunset is 80% or more △: Normal when the retention of strength is 55 to less than 80%

X: The strength retention was less than 55%

(13) Backing workability: Evaluated in the following three stages.

〇: The pile fabric is uniformly backed without floating from the backing layer

Δ: The pile fabric is slightly floating.

X: The pile fabric is floating and a gap is formed between the pile fabric and the backing layer.

(14) Hetering resistance: Prepare a circular pressurizer with a smooth surface with an area of 180 cm ² , compress it with a compressive stress of 40 kPa for 5 seconds, and repeat it for 500 times. The settling of the pile when repeated was evaluated as settling resistance.

良好: Good without change in appearance

X: The pile at the compressed location is loose or defective

(15) Cattle degradability: ISOZ] was evaluated according to 485.

良好: Good with biodegradation of 70% or more

X: Biodegradation is less than 70% and defective.

Melting point 170: polylactic acid having a number average-average molecular weight of 5400, MFR of 50 g and a copolymerization molar ratio of D-lactic acid and Z-L-lactic acid of〗 Z99 in the following:

“PLA-1”) was melted at a temperature of 2 I 0 V, and discharged from a single-phase spinning metal to perform melt spinning. Next, the spun yarn is cooled by a known cooling device; the 1: 1 yarn is cooled, and the spun yarn is placed below the spinning wire. With the installed air soccer, it is towed at a drawing speed of 5500 ϋ in Z minute, opened using a known opening device, and collected and deposited on a moving collection tube to obtain long fibers. Web. The single fiber fineness of this long fiber was 3 decitex.

Using a hot embossing roll for this long fiber web, the pattern: the point, the area of each press-contact area: 0.6 mm ² , the processing temperature: 115 t :, the press-contact area ratio: 10% Partial heat welding was performed under the conditions to obtain a single-phase long-fiber nonwoven fabric. Further, 0.5 mass% of dimethylpolysiloxane emulsion is added to the constituent fibers as a solid content, and a binder composed of an aqueous solution of polylactic acid is impregnated with 12 mass% of the entire base fabric. Thus, a base cloth for tufted carpet having a thickness of H; ^ 100 g / m ² was obtained.

On the other hand, polylactic acid having a melting point of 170 ° C, a number average molecular weight of 6900, an MFR of 30 g / 10 min, and a copolymerization molar ratio of D-lactic acid / L-lactic acid of 1 Z99 was converted to a temperature of 21 It is melt-spun at 0 ° C, discharged from a single-phase spinneret, melt-spun via a take-off roll, and the yarn is rolled between the take-up roll and a roll extending below it. I got along. Subsequently, the drawn yarn is guided to a heated and humidified crimper placed below the drawing roll and subjected to a relaxation heat treatment, and the polylactic acid of the 144-decitix Z64 filament is produced. The resulting pile yarn was obtained.

Next, using a tufting machine, the pile yarn made of polylactic acid described above was placed on a base fabric for evening carpet made of polylactic acid as described above, with a gauge of 1Z10 and a stitch of 10 pieces of Z2.5. Tufting was performed under the conditions of 4 cm, loop noise 6 nm.

In addition, the polylactic acid resin is extruded into a film shape, and after laminating on the back of the tufted cloth, knocking is performed and the tufted force is reduced. I got it.

Table 1 shows the physical properties of the obtained base fabric and carpet.

Example 1 Example 2 Example 3 Example 3 Example 4 Example 5 Example 6

PLA-1 Shi / D (Mole!; Dani) 99/1

MFR (g / 10 minutes) 50

Melting point (° C) 1 70 *-

P then A-2 L / D (molar ratio)--one-one

MFR (g / 10 minutes)------Melting point (° c)------Yarn cross section Single phase-*-Spinning / drawing composite ratio (PLA / PLA-2)-1-1-Conditions ¾ ^ l¾Slm / minj 5500 5000 6000 5500

Stretching ratio 1--1-Yarn production 〇〇 o 〇〇〇 ii) g (T "tex) 3.3 6.6 ― ―

Raw yarn Double bean loaf X 10 " ³ ) 1 7.9 17.5 16.4 18.6 1 7.5

Crystallinity (mass%) 18.2 18.3 1 7.7 1 9.2 1 8.3

Processing method Enho's sroll <-processing temperature C) 1 15 —- *-*-Binder Polylactic acid--*-Polyacrylic rooster § Ester 2-dolha

Weight (g / m ² ) 100

Primary fabric KGSM strong (N / 5cm width) (MD / CD) 218/156 207/148 187/133 227/1 62 210/150 210/151 Heat shrinkage (%) (MD / CD) 0.2 / 0.1 0.3 /0.1 0.4 / 0.2 0.2 / 0.1 0.3 / 0.1 0.3 / 0.1 Rigidity (cN 'cm m ² ) 0.271 0.302 0.288 0.310 0.345 0.306 Strength retention 〇〇 O △ 〇〇 Force unit Backing workability 〇〇 O 〇〇へ Hetering resistance 〇〇〇〇〇生 Biodegradable 〇 0 〇〇〇〇

Example 2

The history of PLA-1 discharge from the spinneret was changed and adjusted so that the single-filament fineness of long fibers became 6.6 decitex. The other conditions were the same as in Example 1 to obtain a tufted carpet base fabric and an evening carpet.

Table 1 shows the physical properties of the obtained base cloth and carpet.

Example 3

Change the discharge M of PLA-1 from spinning U gold, and change the pulling speed of the air force to 5ϋ0mZ so that the single fiber fineness of the fiber becomes 6.6 decitex. Was adjusted. The other conditions were the same as in Example 1 to obtain a tufted carpet base fabric and a tufted force packet.

Table 1 shows the physical properties of the obtained base cloth and carpet.

Example 4

The discharge amount of PL Α-1 from the spinneret was changed, and the pulling speed of the air sucker was changed to 600 mZ so that the single-fiber fineness of the long fibers became 6.6 decitex. It was adjusted. Other than that, under the same conditions as in Example 1, a piece of evening foot carton] base cloth and a piece of evening foot power were obtained.

Table 1 shows the physical properties of the obtained base fabric and power pipe.

Example 5

The single-phase & fiber non-woven fabric of Example 1 was impregnated with 12% by mass of a nodule composed of the aqueous solution of polylactic acid of Example 1 and a nodder composed of an aqueous solution of polyvinyl alcohol in place of the binder. Evening A base fabric for a carpet was obtained. Other than that, the same as in Example 1. —Put ffi fabric and tufted carpet were obtained.

Table 1 shows the physical properties of the obtained base cloth and carpet.

Example 6

The biphasic d-fiber nonwoven fabric of Example 1 was impregnated with 6 masses of a binder composed of an aqueous solution of acrylate and instead of the binder composed of the aqueous solution of polylactic acid of Example 1, and the mass was impregnated. basis weight was obtained base fabric for Tafute' de carpets of l OO g / m ^2. Other than that, the same conditions as in Example 1 were used.Table 1 shows the physical properties of the obtained base fabric and carpet for the evening foot carpet and the fabric for evening foot carpet. .

Example 7

A tufted carpet was obtained by making the following differences from Example 1. That is, the processing temperature of the embossing roll was set to 80 ° C., and the S-fiber nonwoven fabric was manufactured by temporary welding. Then, through the RPD 3 6 # Needle punching machines this nonwoven yelling planting of Needle needle, the needle density 6 0 times Z cm ² at paragraph shall knee Dorupanchi, mechanically entangled structure fibers of the nonwoven fabric And punch punch dueb. Further, the punched web was heat-sealed at a press-contact temperature of 110 ° C. Then, a binder made of a polylactic acid aqueous solution was adhered to the mass at a temperature of 110 ° C. Then, a base cloth for a tufted carpet was attached. Was manufactured.

The base cloth thus obtained and the carpets obtained using this base cloth are shown in the table.

Example 8

A nonwoven fabric was manufactured using long fibers having a core-sheath structure as synthetic fibers. In detail, PLA-: 1 of Example 1 is disposed on the core, and the sheath has a melting point of 150, a number average molecular weight of 5150, an MFR force of 50 g / 10 minutes, At a temperature of 210 ° C, each polylactic acid is melted so that polylactic acid having a copolymerization molar ratio of D-lactic acid-L-lactic acid of 5 Z95 (hereinafter referred to as “PLA2”) is arranged. The spinning of the double core-sheath type was performed by spinning the composite ratio (PLA-1 ZPLA-2) from the metal under the condition of 70 Z30 mass%, and the melt spinning was performed. Next, the spun yarn is cooled by a known cooling device, and then allowed to flow at a drawing speed of 530 m / min by a air soccer installed below the spinneret; The fiber was opened using a fiber opening device, and the fiber was collected and deposited on a moving collection surface to form a long fiber web. The single fiber fineness of this long fiber web was 6.6 decitex. Then, using a hot embossing roll for this long fiber web, pattern: point, area of each press-contact area: 0, 6 mm ² , application temperature: 105 ° C, press-contact area ratio: 10% Partial heat welding was performed under the following conditions. Et al of the Emarujiyo emissions of dimethylpolysiloxane to the fibers constituting the solid content 0. Impart to 5 wt%, basis weight 1 0 0 g, of 'm ^2, was produced core-sheath composite long-fiber nonwoven fabric. This nonwoven fabric was used as a base fabric for a tough carpet.

Next, using this base cloth, a tufted force-cut was obtained under the same conditions as in Example 1.

Table 2 shows the physical properties of the obtained base fabric and carpet.

Example 9

The spinning rate of P-sulfur-1 and PLA-2 from 1 gold was adjusted for spinning, and the composite ratio (PLA-) / PLA-2) was set at 50/50% by mass. Soshi Otherwise, under the same conditions as in Example 8, a base fabric and a tufted carpet were obtained.

Table 2 shows the physical properties of the obtained base fabric and carpet.

Example 10

By adjusting the amount of PLA-1 and PLA-2 discharged from the spinneret, the composite ratio (PLA-1 / PLA-2) was set at 30/70 mass%. Then, under the same conditions as in Example 8, a base fabric and a piece of tufted force were obtained.

Table 2 shows the physical properties of the obtained base cloth and pliers.

Example 1 1

As compared with Example 8, the far-coupling of the sheath portion of the long fiber having the core-sheath structure was changed. In detail, for the sheath of long fiber, the melting point is 1.35 ° C, the number average molecular weight is 490,000, and the MFR is 50 g / 10 min. A polylactic acid having a ratio of 8 to 92 (hereinafter referred to as “PLA-3”) was melted at a temperature of 210 ° C., and the core polymer was the same as in Example 8; It discharged more. At this time, the composite ratio (PLA-1 / PLA-3) was set to 50Z50% by mass. In addition, the towing speed of the air sucker was set to be 500 m minutes, and the heating temperature of the hot emboss mouth was set to 90 ° C. The other conditions were the same as those in Example 8 to obtain a cloth and a tufted carpet under the 问 -condition.

Table 2 shows the physical properties of the obtained base cloth and power pipe.

Example 1 2

The cross-sectional structure of the long fiber is multi-lobed. In detail, the PLA-1 used in Example 配置 is arranged in the core, and the PL Λ2 used in Example 8 is arranged in six parts. ^ ^ Then From the spinneret, the composite ratio (PLA-1 ZPLA-2) is set to 50/50 mass%, and the yarn having the cross-sectional structure of the 6-leaf composite type shown in Fig. 1 is obtained. It was melt spun. Next, after cooling the spun yarn by a known cooling device, the spun yarn is towed and thinned by an air sucker provided below the spinneret at a drawing speed of 5300 mZ, The fiber was opened using a known fiber opening device, and was captured and deposited on a moving capturing surface to obtain an S fiber web. The single-fiber fineness of the long fibers constituting this web was 6.6 decitex.

Next, using a hot embossing roll for this long fiber web-pattern: point, area of each pressure welding area: 0.6 mm ² , heating temperature: 105 ° C, pressure welding area ratio:] perform partial thermal pressure at 0% for 0 to fibers constituting the Emarujo emissions of Jimechirupo polysiloxane in solids. 5 wt% giving to give a basis weight l OO g Zm ² core-sheath composite long fiber nonwoven fabric This was the base fabric. Next, a tufted doka-pet was obtained under the same conditions as in Example 8.

Table 2 shows the physical properties of the obtained base fabric and carpet.

Example 13

The PL Λ—1 of Example 1 and the PL Λ—2 of Example 8 were melted at 2.10 "C, and the fiber mixture ratio (PL Λ-1 / PL The melt spinning was carried out by setting Λ-2) to 70 / '30 quality if% .The spun yarn was cooled by a known cooling device, and subsequently, it was placed below the spinneret. At the installed air sucker, the yarn is drawn and thinned at a drawing speed of 5300 OmZ, and the yarn is spread using a known spreader, and collected and deposited on a moving trapping surface. The long fiber web of PLA-1 and the long fiber Mi of PLA-2 are respectively (;. There was decitex.

For this long fiber web, using a hot embossing roll, the pattern: the point, the area of each press-contact area: 0.6 mm ² , the heating temperature: 105, and the H ^: . Partial heat welding under 接% conditions, and addition of dimethylpolysiloxane emulsion to the constituent fibers in a solid content of 0.5 quality; giving a composite fiber with a basis weight of 100 g Zm ² Using this as a base cloth, a tufted carpet was obtained under the same conditions as in Example 8.

Table 3 shows the physical properties of the obtained base cloth and carpet.

Example 13 Example 14 Example 15 Comparative Example 1 Comparative Example 2 Comparative Example 3

PLA-1 L / D (molar ratio) 99/1 Polypropylene

MFR (g / 10 min) 50 ― 1 40 Melting point (° C) 170 ⁴ 160

P then A-2 L / D (molar ratio) 95/5 1 ― ― ―

MFR ( _g / 10min) 50 ― ― ― ― Melting point (° c) 150 1 ― 1 ― Yarn cross section Mixed fiber composite Core-sheath composite Single phase

Spinning / drawing composite ratio (PLA-1 / PLA-2) 70/30 50/50 ― one ― one

Conditions Towing speed (m / min) 5300 1200 2300 7200 3800 Stretching ratio ― ― 2.5 ― Threading property 0 〇 O 〇 X 〇 Fineness (decitex) 6.6 ―

Yarn birefringence ^{(X 10 3) 17.0 / 16.6} * 16.9 28.3 10.4

Crystallinity (mass ¾) 18.2 / 17.3 * 18.0 24J 12.1

Machining method Enho's rolls through through Enho's mouths ⁴ Enho's Rolling Processing temperature (° c) 105 155 125 115 135 Binder polishing US $ Acrylic thread

Weight (g / m ² ) 100 100 Primary base cloth KGSM strong (N / 5cm width) (MD / CD) 192/136 148/140 275/196 93/88 247/224 Heat shrinkage (%) (MD / CD ) 0.4 / 0.2 0.1 / 0 0/0 38/31 0.1 / 0 Rigidity cN 'cm / cm ² ) 0.292 0.270 0.414 0J39 0.211 Strong retention 〇〇 0 X 〇 Power unit backing workability 〇〇〇 XO resistance Settling 性〇〇〇 X Biodegradable 〇 OO 〇 X

*: Example 13 is PLA-1 / PLA-2

Example 14

The fibrous web obtained in Example 8 was introduced into a continuous heat treatment device at a temperature of 1550 to perform thermal through treatment. Then, 0 to constituent fibers to Webu after this heat treatment the Emarujo emissions of dimethyl polysiloxane solids. With 5 mass% ^, and basis weight 1 0 0 g Z m ² of core-sheath composite long fiber nonwoven fabric I got Then, using this as a base cloth, an evening foot kit was obtained under the same conditions as in Example 8.

Table 3 shows the physical properties of the obtained cloth and carpet.

Example 15

Using PLA-1 of Example 1, a base fabric for a tufted cart made of spin draw yarn was manufactured. In detail, PLA-1 was melted at a temperature of 210 ° C, discharged from a single-phase spinneret and melt-spun. Then, the spun yarn was cooled by a known cooling device. After that, the yarn was led to a first roll (speed: 200 mZ, at a temperature of 80) placed below the spinneret, and further placed below the first roll and below. At a speed of 300 mZ / min with the second roll at a temperature of 100 m and a speed of 300 m / min. Then, a 2.5-fold stretched Nobu middle yarn was sucked by air soccer, and then spread using a known spreader. Then, it was collected and deposited on the moving collection ρ'π to form a long-fiber web made of Nakanobu, and the single-fiber fineness of this long fiber was measured at 6.6 Tetex.

A hot embossing roll is applied to this long fiber weave, 枘: point, ίιί の in each press-contact area: 0.6 mm ^z , force temperature: 1 て 2, 、, joint volume ratio:】 Partial heat) at 0%, and 0 to the fibers constituting the Emarujo emissions of siloxane solids. 5 mass% grant, basis weight was obtained 1 0 0 g Z m ² of single-phase type long-fiber nonwoven fabric.

The other conditions were the same as in Example 1, and Jinbu and Evening Carts were obtained.

Table 3 shows the physical properties of the obtained cloth and carpet. As is clear from Tables 1 to 3, the base fabrics obtained in Examples 1 to 15 were excellent in mechanical stability and thermal stability, and also excellent in curability as a carpet. . In particular, the woven fabrics composed of the composite-form long fibers of Examples 8 to 14 had good maneuverability and were able to stably obtain a base fabric. In addition, the fibers were firmly adhered to each other, and nevertheless, the degree of freedom of the base fabric was retained, so that the fibers had excellent strength retention after tufting. Further, the tufted carpet made of these base fabrics had very good biodegradability. Example 16

The base cloth obtained in Example 8 was coated with a 144-decitix / '64 filament Nylon 6-forced iririle yarn, and a tufting machine was used to measure the gauge 1/1. (), Stitching 1 ◦ This Z 2.54 cm, the loop bleed length was 6 mm, and the evening was settled. Next, the polyethylene resin was extruded in a film shape, and the backing was performed by laminating the back surface of the tufted cloth to obtain an evening foot-force.

As a result, the tenacity retention after the tufting was 8% or more, the pile fabric having the no '(lining) did not float, and the base fabric was uniformly backed. Note that the pile yarn and backing material of the obtained carpet do not biodegrade, so when discarding this carpet, each member (backing material, pile yarn, base cloth) ), And only the biodegradable base fabric can be biodegraded. Comparative Example 1

The discharge amount of PLA · 1 from the spinneret was changed, and the pulling speed of air soccer was changed to 230 mZ, so that the fineness of the single yarn was adjusted to 6.6 decitex. Then, under the same conditions as in Example 1, a base cloth and a tufted cart were obtained.

Table 3 shows the physical properties of the obtained base cloth and carpet.

Comparative Example 2

The amount of PLA-1 discharged from the spinneret was changed, and the pulling speed of air soccer was changed to 720 mZ, so that the fineness of the single yarn was adjusted to 6.6 dtex. Other than that, the melt spinning was attempted under the same conditions as in Example 1, but the yarn breakage occurred frequently, and a long fiber nonwoven fabric could not be obtained.

Table 3 shows the production conditions and the spinning properties at this time.

Comparative Example 3

Melting point force 160. C, MFR force of 40 g / '] 0-minute polypropylene was melted at a temperature of 230 ° C, and this was discharged from a single-phase spinneret to perform melt spinning. Next, the spun yarn is cooled by a known cooling device, and the spun yarn is drawn into the spinning yarn at a drawing speed of 3800 m / min by an air soccer installed below the I-gold.を、、、、、、、 -3 δ-Captured and deposited on the moving collecting surface to obtain a long fiber web. The single fiber fineness of this long fiber was 6.6 decitex.

For this long fiber web, using a hot embossing roll, pattern: point, each ffi contact area | area: 0.6 mm ² , processing temperature: 135,) joint rate: 10% in performs partial thermal pressure, 0.5 and quality% imparted to constituent fibers in the solid content Emarujo emissions of Jimechirupo polysiloxane La, the basis weight 1 0 0 g / m ² of the single-phase type long-fiber nonwoven fabric Obtained. Further, the non-woven fabric of the long-phase long fiber was impregnated with a binder composed of the aqueous solution of acrylate ester used in Example 6 so that the amount of the acrylate ester binder attached was 6% by mass. Fabric was manufactured.

On the other hand, the melting point force of 160 ° C and the MFR force of 20 g / 10 minutes is melted at a temperature of 230 V and discharged from a single-phase spinneret. Then, the yarn was drawn between the JI stripper and a drawing roll disposed below the roll. Subsequently, the drawn yarn is guided to a heated-humidified crimper arranged below the drawing roll to perform a relaxation heat treatment, and a high-density polypropylene of 144 dtex / ^ 64 filament is applied. A pile yarn made of pyrene was obtained.

The pile yarn was tufted into a base cloth made of a pyrene filament long fiber. Otherwise, a tufted carpet was obtained under the conditions of Example 1 and M.

Table 3 shows the obtained base fabric and carbureted material.-As is clear from Table 3, in Comparative Example 1, the spinning speed was too low, the birefringence rate, and the finished husk was wood.下 ^ The thermal characteristics and thermal stability were poor. In addition, the strength retention after toughness and the backing ability were good.

Comparative Example 2 was inferior in spinnability due to high-speed spinning and frequently caused thread breakage, so that a base fabric for a tufted force per pet could not be obtained.

The tufted carbet of Comparative Example 3 was not biodegradable, and therefore had a problem in disposal. In addition, due to the repeated compression, the pile became dull and the appearance was poor.

Claims

The scope of the claims

1. A base fabric for a tufted carpet, which is drawn by a long-fiber non-woven fabric formed of a polylactic acid-based II composite, wherein the long fibers have a cross-section.

5 shapes Ri birefringence ^{1 2 X 1 0- 3 ~ 3} 0 X 1 0- 3 der Li Kui crystallinity of 1 5-2 5% by mass with circular, the Tafutetsu cathodic one pet The base fabric has a heat shrinkage rate of 1% or less in the direction of 120 ° (in 3 minutes, MD and CI).

] 0

2. The base fabric according to claim 1, wherein the fiber constituting the nonwoven fabric is one of a single-phase type, a side-by-side type, a sea-island type, and a core-sheath type.

3. A base fabric for tufted carpet, comprising a long-fiber nonwoven fabric formed of a polylactic acid-based polymer, wherein the long fibers have an irregular cross-sectional shape and a degree of crystallinity of 15. The heat shrinkage of the tufted carpet base fabric at 120 ° C. for 3 minutes is 1% or less in both MD and CD directions. 0

4. The base fabric according to claim 3, wherein the cross-sectional shape of the fiber constituting the nonwoven fabric is any of a single-phase type, a side-by-side type, a sea-island type, a core-sheath type, and a multi-leaf type. .

5. The base fabric described in claim 1 in any one of claims 1 to 4, wherein a fiber m, which is a non-woven fabric, is thermonucleated.

6. The base fabric according to claim 5, wherein the fibers constituting the nonwoven fabric are partially heat-bonded to each other, or these fibers are thermally bonded to each other at a contact point between the fibers.

7. The base fabric according to claim 5, wherein the fibers constituting the non-woven fabric are three-dimensionally entangled with each other, and a force at which these fibers are partially heat-pressed to each other; or The fibers are thermally bonded to each other at the points of contact between the fibers.

8. The base cloth according to any one of claims 5 to 7, wherein the contacts between the fibers are bonded with a binder resin.

9. The base fabric according to claim 8, wherein the binder resin is a polylactic acid-based polymer.

10. A tufted carpet, including the base fabric according to any one of claims 1 to 9].

11. The tufted car according to claim 10, wherein a pile yarn is tufted on a base fabric, and the pile yarn is formed of a polylactic acid-based polymer.

1 2. Requested time 1 1: The tufted carpet of this description, wherein the pile yarn is formed of a bulky continuous yarn. 13. A tufted carpet according to claim 1, wherein the backing material has a backing material on a surface of the base fabric opposite to a side on which the pile yarn is tufted. The knocking material is formed of a biodegradable material.