CN101666057B - Dust-free paper - Google Patents
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- CN101666057B CN101666057B CN 200810215792 CN200810215792A CN101666057B CN 101666057 B CN101666057 B CN 101666057B CN 200810215792 CN200810215792 CN 200810215792 CN 200810215792 A CN200810215792 A CN 200810215792A CN 101666057 B CN101666057 B CN 101666057B
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Abstract
The invention relates to dust-free paper which is prepared from the following main raw materials in percentage by weight: 5-55 percent of superabsorbent short fiber, 10-95 percent of wood pulp fluff short fiber and 0-35 percent of thermoplastic short fiber. The multiplying power of the dust-free paper for absorbing distilled water is 21-88g/g, and the multiplying power for absorbing physiological saline is 11-35g/g. The weight of the dust-free paper per square meter is 35-500g, and the tensile strength of a section of the dust-free paper with a width of 20mm is 0.11-0.87KN/m. The dust-free paper can be applied to an absorbing layer of a disposable absorbing article.
Description
Technical field
The present invention relates to a kind of dust-free paper, relate in particular to dust-free paper with super absorbent function.
Background technology
Dust-free paper claims heat seal dry method paper or the expanded paper of dry method again, and it generally is divided into glue molding dust-free paper and hot synthetic type dust-free paper.The various material compositions of glue molding dust-free paper are after disperseing, mixing, deliver on the former by seperator, adopt the wind flow forming technique, the air-flow of fibre-bearing group enters screen cylinder formula forming head with the laminar flow form, through screen cylinder, the rightabout dispersed with stirring effect of nail Kun, make fibrous mass under the stirring action of nail Kun, be dispersed into single fiber, in constantly rotating, fiber is adsorbed under the effect of vacuum draw under forming net and forms uniform paper web on the forming net by the screen cylinder eyelet.Various material compositions form the fiber bonding through spraying latex or hot melt adhesive behind air lay again.The hot synthetic type dust-free paper is general adopt with thermoplastic fibre, wood pulp fluff mixed with fibers evenly after, moulding in forming net, the fiber web that is shaped is delivered to carries out hot blast in the oven heat and penetrate, make thermoplastic fibre fusing, between the thermoplastic fibre, the hot sticky point of formation makes the bonding even moulding of fiber between thermoplastic fibre and the wood pulp fluff fiber.
In the prior art in order to improve the absorbent properties of dust-free paper, between fiber, be mixed with super water-absorbing polymer particles, and at present in containing the dust-free paper preparation technology of super water-absorbing polymer particles, super water-absorbing polymer particles in the dust-free paper drops easily, its consequence is the absorption multiplying power that can not reach expection, and causes the waste of resource.
Summary of the invention
The objective of the invention is in order to overcome the defective of prior art, a kind of dust-free paper of super absorbent function is provided, and production technology, the production equipment of this dust-free paper are simple, and product cost is lower, and its absorbent properties, permeability, mechanical performance improve, and are applicable to the absorbed layer of disposable hygienic article etc.
The invention provides a kind of dust-free paper, this dust-free paper is a main raw material with super water-absorbent staple fibre, wood pulp fluff staple fibre and thermoplastic short fiber, wherein the super water-absorbent short fibre content is 5wt%-55wt%, the wood pulp fluff short fibre content is 10wt%-95wt%, thermoplastic short fiber's content is 0-35wt%, the multiplying power that this dust-free paper absorbs distilled water is 21-88g/g, and the multiplying power that absorbs physiological saline is 11-35g/g.In moisture-holding capacity test, the moisture-holding capacity that absorbs behind the distilled water is 10-70g/g, and the moisture-holding capacity that absorbs behind 0.9% physiological saline is 4-24g/g.The every Gram Mass of described dust-free paper is 35-500g, cuts the described dust-free paper of one section 20mm width, and its tensile strength is 0.11-0.87KN/m.
Described super water-absorbent fiber is made up of at least a water-absorption fiber of water-absorption fibers such as cellulose family water-absorption fiber, polycarboxylic acid water-absorption fiber, acrylic acid series water-absorption fiber, polyacrylonitrile water-absorption fiber, modified polyvinylalcohol water-absorption fiber.This superabsorbent fiber contains-COOH ,-COONa ,-CONH2 ,-the OH group, the suction group cooperative effect that these are different makes its water absorbing capacity, the performance that especially absorbs physiological saline improves.
According to dust-free paper provided by the invention, do not include granular super absorbent polymer, reach in process of production in the follow-up reprocessing process and can avoid the graininess super-absorbent polymer to drop.Simultaneously, the super water-absorbent staple fibre is applied to help in the dust-free paper increasing dried, the wet tensile (strength) of dust-free paper, prevents simultaneously because of the imbibe of dust-free paper intermediate layer, and product produces slippage relatively between levels because of layering.The synergistic action effect of super water-absorbent staple fibre and wood pulp fluff staple fibre is better, and super water-absorbent stability of fiber, uniformity are better.This dust-free paper has globality preferably after moisture absorption, even also be difficult for taking place the phenomenon of levels slippage under the effect of external force.The dust-free paper of the present invention preparation is applied to the absorbed layer of disposable adsorption object, can satisfies the high absorbent function of disposable adsorption object.
The specific embodiment
According to dust-free paper provided by the invention, with super water-absorbent staple fibre, wood pulp fluff staple fibre and thermoplastic short fiber is main raw material, the super water-absorbent short fibre content is 5wt%-55wt%, the wood pulp fluff short fibre content is 10wt%-95wt%, thermoplastic short fiber's content is 0-35wt%, the multiplying power that this dust-free paper absorbs distilled water is 21-88g/g, and the multiplying power that absorbs physiological saline is 11-35g/g.The fiber number of super water-absorbent staple fibre is 2-15dtex, and fracture strength is 1.0-4.0g/d.Being fit to super water-absorbent staple fibre of the present invention can be made up of at least a water-absorption fiber of cellulose family water-absorption fiber, polycarboxylic acid water-absorption fiber, acrylic acid series water-absorption fiber, polyacrylonitrile water-absorption fiber, modified polyvinylalcohol water-absorption fiber or the like.This superabsorbent fiber contains-COOH ,-COONa ,-CONH2 ,-the OH group, the suction group cooperative effect that these are different makes its water absorbing capacity, the performance that especially absorbs physiological saline improves.Thermoplastic short fiber of the present invention can be at least a composition in the fibers such as PE, PET, PE/PP and PE/PET, and length is 5-12cm, and fiber number is 1.7-3.3dtex, and tensile strength is 3.0-3.1cN/dtex.
1, test absorbs the method for distilled water (or 0.9% physiological saline) multiplying power:
(1) used instrument: (a) balance (can be accurate to 0.001g), (b) filter bag (63 μ m nylon wire), (c) 2L beaker, (d) stopwatch
(2) step: (a) in the 2L beaker, pour 1000ml distilled water (or 0.9% physiological saline) into, the example weight (being designated as W1) of the accurate described dust-free paper of weighing, the Nylon Bag of packing into; (b) Nylon Bag is soaked in the distilled water (or 0.9% physiological saline) of 1000ml, makes its fully absorb water (or 0.9% physiological saline); (c) Nylon Bag that will comprise dust-free paper after 60 minutes hangs liquid level, drips (or 0.9% physiological saline) naturally after ten minutes, and the weight of weighing this moment dust-free paper is W2; (d) get 5 sample tests, average, be accurate to a decimal point as test result.
(3) computational methods: the multiple (g/g) of absorption distilled water (or 0.9% physiological saline)=(W2-W1)/W1
2, in the present invention, the method for testing of moisture-holding capacity: the Nylon Bag that dust-free paper is housed that will finish absorption multiplying power mensuration claims its weight A after carrying out the centrifugal dehydration of 90s in the Water Extraction Machinery (1600u/min, diameter 100mm).Test 3 samples, average, be accurate to a decimal as measurement result.Moisture-holding capacity C (g/g)=(A-B)/S, wherein A is Nylon Bag and gelinite weight, and B is the weight after the Nylon Bag dehydration, and C is a moisture-holding capacity, and S is a samples weighed.
Embodiment 1
55wt% super water-absorbent staple fibre, 45wt% wood pulp fluff staple fibre after disperseing, mixing, are pressed 35g/m
2Deliver on the former by seperator.Adopt the wind flow forming technique, the air-flow of fibre-bearing group enters screen cylinder formula forming head with the laminar flow form, through screen cylinder, the rightabout dispersed with stirring effect of nail Kun, make fibrous mass under the stirring action of nail Kun, be dispersed into single fiber, in rotation constantly, fiber is adsorbed under the effect of vacuum draw under forming net and forms the uniform fibers net on the forming net by the screen cylinder eyelet.Staple fibre forms the fiber bonding through spraying latex or hot melt adhesive behind air lay again.In the experiment, it is 82g/g that this dust-free paper absorbs the distilled water multiplying power, and moisture-holding capacity is 62g/g; Absorbing the physiological saline multiplying power is 32g/g, and moisture-holding capacity is 24g/g.Cut the described dust-free paper of one section 20mm width, its tensile strength is 0.11KN/m.
Embodiment 2
55wt% super water-absorbent staple fibre, 45wt% wood pulp fluff staple fibre after disperseing, mixing, are pressed 500g/m
2Deliver on the former by seperator.Adopt the wind flow forming technique, the air-flow of fibre-bearing group enters screen cylinder formula forming head with the laminar flow form, through screen cylinder, the rightabout dispersed with stirring effect of nail Kun, make fibrous mass under the stirring action of nail Kun, be dispersed into single fiber, in rotation constantly, fiber is adsorbed under the effect of vacuum draw under forming net and forms the uniform fibers net on the forming net by the screen cylinder eyelet.Staple fibre makes through spraying latex or hot melt adhesive that bonding forms between the fiber again behind air lay.In the experiment, it is 88g/g that this dust-free paper absorbs the distilled water multiplying power; Moisture-holding capacity is that 67g/g absorption physiological saline multiplying power is 34g/g, and moisture-holding capacity is 23g/g.Cut the described dust-free paper of one section 20mm width, its tensile strength is 0.67KN/m.
Embodiment 3
After 55wt% super water-absorbent staple fibre, 10wt% wood pulp fluff staple fibre and 35wt% thermoplastic short fiber measured shredding, the three entered pulverizer and pulverizes, evenly mixes.The above-mentioned raw materials composition is delivered on the former by seperator after disperseing, mixing.Adopt the wind flow forming technique, the air-flow of fibre-bearing group enters the horizontal forming head through gas port, stir through two groups of homodromal dispersed with stirring devices, make most fibrous mass be dispersed into single fiber, under the effect of dispersed single fiber vacuum draw under forming net, be adsorbed to formation uniform fibers net on the forming net by the circular hole flat vibrating screen by every square metre 300 grammes per square metre that restrains.Fiber web after being shaped is delivered to carries out hot blast in the oven heat and penetrate, make low melting point thermoplastic fibres fusing, between the low melting point thermoplastic short fiber, between low melting point thermoplastic short fiber and the wood pulp fluff staple fibre, low melting point thermoplastic short fiber absorbs water with super that the hot sticky point of formation makes products with adhesive even between the staple fibre.According to the quantitative performance requirement that waits that contains super water-absorbent fiber dust-free paper, regulate hot blast temperature and be controlled at 140-145 ℃, under this temperature, production process can reduce the dust-free paper top layer and fall a mao phenomenon, and the low melting point thermoplastic fibres is melted fully.In the experiment, it is 66g/g that this dust-free paper absorbs the distilled water multiplying power, and moisture-holding capacity is 52g/g; Absorbing the physiological saline multiplying power is 25g/g, and moisture-holding capacity is 19g/g.Cut the described dust-free paper of one section 20mm width, its tensile strength is 0.49KN/m.
Embodiment 4
40wt% super water-absorbent staple fibre, 60wt% wood pulp fluff staple fibre after disperseing, mixing, are pressed 50g/m
2Carding sprays latex or hot melt adhesive the fiber bonding is formed on the fiber web that carding forms.In the experiment, it is 62g/g that this dust-free paper absorbs the distilled water multiplying power, and moisture-holding capacity is 45g/g; Absorbing the physiological saline multiplying power is 28g/g, and moisture-holding capacity is 18g/g.Cut the described dust-free paper of one section 20mm width, its tensile strength is 0.18KN/m.
Embodiment 5
After 40wt% super water-absorbent staple fibre, 40wt% wood pulp fluff staple fibre and 20wt% thermoplastic short fiber measured shredding, the three entered pulverizer and pulverizes, evenly mixes.The above-mentioned raw materials composition is delivered on the former by seperator after disperseing, mixing.Adopt the wind flow forming technique, the air-flow of fibre-bearing group enters the horizontal forming head through gas port, stir through two groups of homodromal dispersed with stirring devices, make most fibrous mass be dispersed into single fiber, under the effect of dispersed single fiber vacuum draw under forming net, be adsorbed to formation uniform fibers net on the forming net by the circular hole flat vibrating screen by every square metre 100 grammes per square metre that restrains.Fiber web after being shaped is delivered to carries out hot blast in the oven heat and penetrate, make low melting point thermoplastic short fiber fusing, and form hot sticky point with super suction staple fibre, wood pulp fluff dimension and make products with adhesive even.According to the quantitative performance requirement that waits that contains super water-absorbent fiber dust-free paper, regulate hot blast temperature and be controlled at 140-145 ℃, under this temperature, production process can reduce the dust-free paper top layer and fall a mao phenomenon, and the thermoplastic fibres of sandwich layer is melted fully.In the experiment, it is 66g/g that this dust-free paper absorbs the distilled water multiplying power, and moisture-holding capacity is 53g/g; Absorbing the physiological saline multiplying power is 25g/g, and moisture-holding capacity is 18g/g.Cut the described dust-free paper of one section 20mm width, its tensile strength is 0.49KN/m.
Embodiment 6
For after 40:25:35 metering, the shredding, the three enters pulverizer and pulverizes, evenly mixes by weight for super water-absorbent staple fibre, wood pulp fluff staple fibre and thermoplastic short fiber.By the grammes per square metre lapping of every square metre 200 gram, by the heat pressure adhesive moulding, described hot pressing temperature is 140-150 ℃.In the experiment, the absorption distilled water multiplying power of this dust-free paper is 59g/g, and moisture-holding capacity is 48g/g; Absorbing the physiological saline multiplying power is 23g/g, and moisture-holding capacity is 17g/g.Cut the described dust-free paper of one section 20mm width, tensile strength is 0.83KN/m.
Embodiment 7
For after 15:50:35 metering, the shredding, the three enters pulverizer and pulverizes, evenly mixes by weight for super water-absorbent staple fibre, wood pulp fluff staple fibre and thermoplastic short fiber.Various material compositions are delivered on the former by seperator after disperseing, mixing.Adopt the wind flow forming technique, the air-flow of fibre-bearing group enters the horizontal forming head through gas port, stir through two groups of homodromal dispersed with stirring devices, make most fibrous mass be dispersed into single fiber, under the effect of dispersed single fiber vacuum draw under forming net, be adsorbed to formation uniform fibers net on the forming net by the circular hole flat vibrating screen by every square metre 70 grammes per square metre that restrains.Fiber web after being shaped is delivered to carries out hot blast in the 140-145 ℃ of oven heat and penetrate, make low melting point thermoplastic staple fibers fusing, between the low melting point thermoplastic short fiber, between low melting point thermoplastic short fiber and the wood pulp fluff staple fibre, form hot sticky point between low melting point thermoplastic short fiber and the super suction staple fibre and make the bonding even and formation dust-free paper of fiber web.In the experiment, the absorption distilled water multiplying power of this dust-free paper is 31g/g, and moisture-holding capacity is 22g/g; Absorbing the physiological saline multiplying power is 15g/g, and moisture-holding capacity is 8g/g.Cut the described dust-free paper of one section 20mm width, its tensile strength is 0.62KN/m.
Embodiment 8
For after 15:60:25 metering, the shredding, the three enters pulverizer and pulverizes, evenly mixes by weight for super water-absorbent staple fibre, wood pulp fluff staple fibre and thermoplastic short fiber.Grammes per square metre lapping by every square metre 170 gram, fiber web after being shaped is delivered to carries out hot blast in 140-145 ℃ the oven heat and penetrate, make low melting point thermoplastic fibres fusing, between the low melting point thermoplastic short fiber, between low melting point thermoplastic short fiber and the wood pulp fluff staple fibre, form hot sticky point between low melting point thermoplastic short fiber and the super suction staple fibre and make the bonding even and formation dust-free paper of fiber web.In the experiment, it is 34g/g that this dust-free paper absorbs the distilled water multiplying power, and moisture-holding capacity is 24g/g; Absorbing the physiological saline multiplying power is 18g/g, and moisture-holding capacity is 11g/g.Cut the described dust-free paper of one section 20mm width, its tensile strength is 0.58KN/m.
Embodiment 9
Wood pulp fluff staple fibre, super water-absorbent staple fibre enter pulverizer and pulverize, evenly mix by weight for after 5:95 metering, the shredding.By the grammes per square metre lapping of every square metre 80 gram, on the fiber web that carding forms, spray latex or hot melt adhesive the fiber bonding is formed.In the experiment, it is 21g/g that this dust-free paper absorbs the distilled water multiplying power, and moisture-holding capacity is 9g/g; Absorbing the physiological saline multiplying power is 14g/g, and moisture-holding capacity is 6g/g.Cut the described dust-free paper of one section 20mm width, its tensile strength is 0.12KN/m.
Embodiment 10
For after 5:80:15 metering, the shredding, the three enters pulverizer and pulverizes, evenly mixes by weight for wood pulp fluff staple fibre, super water-absorbent staple fibre and thermoplastic short fiber.By the grammes per square metre lapping of every square metre 80 gram, on the fiber web that carding forms, spray latex or hot melt adhesive the fiber bonding is formed.In the experiment, it is 28g/g that this dust-free paper absorbs the distilled water multiplying power, and moisture-holding capacity is 18g/g; Absorbing the physiological saline multiplying power is 11g/g, and moisture-holding capacity is 5g/g.Cut the described dust-free paper of one section 20mm width, its tensile strength is 0.87KN/m.
The heat seal dust-free paper glues together dust-free paper and has more excellent physical property, but the heat seal dust-free paper exists a mao phenomenon, limited its range of application, can adopt the mixed-forming technology, on the basis of hot synthetic type, in a small amount of latex of fibroreticulate upper and lower surface sprinkling or hot melt adhesive, fall a mao phenomenon on a small quantity with what improve that paper web exists.
According to the invention provides a kind of dust-free paper, this dust-free paper is a main raw material with super water-absorbent staple fibre, Time of Fluff Slurry staple fibre and thermoplastic short fiber, wherein the super water-absorbent short fibre content is 5wt%-55wt%, the wood pulp fluff short fibre content is 10wt%-95wt%, thermoplastic short fiber's content is 0-35wt%, the multiplying power that this dust-free paper absorbs distilled water is 21-88g/g, and the multiplying power that absorbs physiological saline is 11-35g/g.In moisture-holding capacity test, the moisture-holding capacity that absorbs behind the distilled water is 10-70g/g, and the moisture-holding capacity that absorbs behind 0.9% physiological saline is 4-24g/g.The every Gram Mass of described dust-free paper is 35-500g, cuts the described dust-free paper of one section 20mm width, and its tensile strength is 0.11-0.87KN/m.
This dust-free paper utilizes conventional production process and the production equipment in this area to produce, and it can be used as the absorbed layer of disposable sanitary articles, satisfies super absorbent function.Though reference several preferred implementations wherein show the present invention and describe, but design concept of the present invention is not limited thereto, and can carry out various changes, deletion and increase to its form and details without departing from the spirit and scope of the present invention.But should be noted that some possible modification still fall in the protection domain of claim.
Claims (12)
1.
A kind of dust-free paper, this dust-free paper is a raw material with super water-absorbent staple fibre, wood pulp fluff staple fibre and thermoplastic short fiber, it is characterized in that the super water-absorbent short fibre content is 20wt%-55wt%, the wood pulp fluff short fibre content is 20wt%-60wt%, and thermoplastic short fiber's content is 20wt%-35wt%; The multiplying power that this dust-free paper absorbs distilled water is 21-88g/g, and the multiplying power that absorbs physiological saline is 11-35g/g; This dust-free paper is in moisture-holding capacity test, and the moisture-holding capacity that absorbs behind the distilled water is 10-70 g/g, and the moisture-holding capacity that absorbs behind 0.9% physiological saline is 4-24g/g.
2.
Dust-free paper as claimed in claim 1 is characterized in that the every Gram Mass of described dust-free paper is 35-500g.
3.
Dust-free paper as claimed in claim 2, the tensile strength that it is characterized in that described dust-free paper is 0.11-0.87 kN/m.
4.
Dust-free paper as claimed in claim 1 is characterized in that described super water-absorbent staple fibre is made up of at least a water-absorption fiber of cellulose family water-absorption fiber, polycarboxylic acid water-absorption fiber, acrylic acid series water-absorption fiber, polyacrylonitrile water-absorption fiber, polyvinyl alcohol water-absorption fiber, modified poly ethylene alcohols water-absorption fiber.
5.
Dust-free paper as claimed in claim 4 is characterized in that described super water-absorbent staple fibre is made up of at least a water-absorption fiber in acrylic acid series water-absorption fiber, polyvinyl alcohol water-absorption fiber and the polyacrylonitrile water-absorption fiber.
6.
Dust-free paper as claimed in claim 1 is characterized in that described thermoplastic short fiber is at least a composition in PP, PE, PE/PP and the PE/PET fiber.
7.
As the described dust-free paper of the arbitrary claim of claim 1-6, it is characterized in that this dust-free paper be described fiber behind carding, spray in web surface that latex or hot melt adhesive typing form.
8.
Dust-free paper as claimed in claim 1, after it is characterized in that described super water-absorbent staple fibre, wood pulp fluff staple fibre and thermoplastic short fiber are by described mixed carding, hot blast penetrates in 140-150 ℃ baking oven, thermoplastic short fiber's fusing, thereby make between the thermoplastic short fiber, between thermoplastic short fiber and the super water-absorbent staple fibre, form hot sticky point between thermoplastic short fiber and the wood pulp fluff staple fibre, and then make that bonding even moulding obtains described dust-free paper between the staple fibre.
9.
Dust-free paper as claimed in claim 1, it is characterized in that described super water-absorbent staple fibre, wood pulp fluff staple fibre and thermoplastic short fiber are by described mixed carding after, form by the heat pressure adhesive moulding.
10. dust-free paper as claimed in claim 9 is characterized in that described hot pressing temperature is 140-150 ℃.
11. as the described dust-free paper of the arbitrary claim of claim 8-10, it is characterized in that this dust-free paper be described fiber through after the heat bonding, spray in web surface that latex or hot melt adhesive moulding form.
12. the purposes as the described dust-free paper of above-mentioned arbitrary claim is characterized in that described dust-free paper is used for the absorbed layer of disposable adsorption object.
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| CN 200810215792 CN101666057B (en) | 2008-09-04 | 2008-09-04 | Dust-free paper |
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| CN 200810215792 CN101666057B (en) | 2008-09-04 | 2008-09-04 | Dust-free paper |
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| CN101666057B true CN101666057B (en) | 2011-05-18 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102337702A (en) * | 2010-07-28 | 2012-02-01 | 南宁侨虹新材料有限责任公司 | Production technology of composite nonwoven fabric-film dust-free paper |
| CN102094362B (en) * | 2010-12-10 | 2013-04-10 | 揭阳市洁新纸业股份有限公司 | Method for producing synthetic paper by adopting dry steam jet and synthetic paper thereof |
| CN103071184A (en) * | 2013-02-05 | 2013-05-01 | 福建恒安集团有限公司 | Disposable hygienic product containing short fiber with super water-absorbing property and thermoplastic fiber and manufacturing method thereof |
| CN103255669B (en) * | 2013-04-11 | 2015-11-25 | 金红叶纸业集团有限公司 | Paper and preparation method thereof |
| CN104674605A (en) * | 2015-03-06 | 2015-06-03 | 深圳市尚初科技有限公司 | Making method of glued airlaid paper |
| CN106012309B (en) * | 2016-06-06 | 2018-05-29 | 厦门源创力科技服务有限公司 | A kind of one-time formed absorptive core wrapping layer compound dust-free paper of low grammes per square metre |
| CN107714306A (en) * | 2017-10-18 | 2018-02-23 | 福建恒安卫生材料有限公司 | A kind of preparation method of neonate's air-permeable leakproof type urine pants and Absorbent Nonwovens |
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Effective date of registration: 20180613 Address after: 362261 Heng an industrial town, Anhai Town, Jinjiang City, Quanzhou, Fujian Patentee after: Fujian HengAn Saitary Material Co., Ltd. Address before: 362261 Jinjiang City, Fujian, Anhai Town Heng an industrial city Co-patentee before: Fujian Hengan Hygiene Material Co., Ltd. Patentee before: Group Co., Ltd. Tai An in Fujian Co-patentee before: Fujian HengAn Saitary Material Co., Ltd. |
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