WO2001021403A1 - Roller screen and method for manufacturing the same - Google Patents

Roller screen and method for manufacturing the same Download PDF

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Publication number
WO2001021403A1
WO2001021403A1 PCT/KR2000/000816 KR0000816W WO0121403A1 WO 2001021403 A1 WO2001021403 A1 WO 2001021403A1 KR 0000816 W KR0000816 W KR 0000816W WO 0121403 A1 WO0121403 A1 WO 0121403A1
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WO
WIPO (PCT)
Prior art keywords
roller screen
master
framework
base
screen
Prior art date
Application number
PCT/KR2000/000816
Other languages
French (fr)
Inventor
Jeong Sik Kim
Original Assignee
K S R Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by K S R Co., Ltd. filed Critical K S R Co., Ltd.
Priority to AU61854/00A priority Critical patent/AU6185400A/en
Publication of WO2001021403A1 publication Critical patent/WO2001021403A1/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41CPROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00Forme preparation
    • B41C1/14Forme preparation for stencil-printing or silk-screen printing
    • B41C1/142Forme preparation for stencil-printing or silk-screen printing using a galvanic or electroless metal deposition processing step
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41NPRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00Printing plates or foils; Materials therefor
    • B41N1/24Stencils; Stencil materials; Carriers therefor
    • B41N1/246Stencils; Stencil materials; Carriers therefor characterised by the electroconductive means or additives
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D1/00Electroforming
    • C25D1/08Perforated or foraminous objects, e.g. sieves

Definitions

  • a sieve material 3 grows in vertical directions 'a' and 'b' from a plain of a sieve skeleton 1 , and also grows in horizontal directions 'c' and
  • a method of manufacturing a roller screen including the steps of: manufacturing a master roller screen by using a base; forming a roller screen by performing an electroforming process of dipping the master roller screen into an electroforming bath; and releasing the roller screen from the master roller screen on which the roller screen is formed.
  • the method of the present invention has such an advantage in that the roller screen can be made with a high precision without using the expensive patterning and etching apparatuses.
  • FIG. 5 is an enlarged view of a framework structure after electrolysis of the base which is used for manufacturing the roller screen according to the present invention
  • FIG. 6 is an enlarged cross-sectional view taken along a line C-C in FIG. 5 of a framework after electrolysis of the base which is used for manufacturing the roller screen according to the present invention
  • FIGs. 2 and 3 illustrate the conventional roller screen used as the base 10 and a structure of the holes 13 of the roller screen, respectively.
  • the base 10 consists of a mesh portion 12 in which a number of holes 13 are formed and a skirt portion 14 extending by a predetermined width from both circumferential edges of the mesh portion 12.
  • the mesh portion 12, as shown by FIG. 3, includes many beehive-shaped holes 13.
  • FIG. 4 is a cross-sectional view taken along a line B-B' which shows the framework 15 forming the beehive-shaped holes 13. As shown by FIG. 4, a cross-sectional shape of the framework 15 of the base is rectangular.
  • the conventional roller screen which is used as the base 10 is dipped into a electrolysis bath to perform electrolysis process. During the electrolysis, metal ions are dissolved in the electrolysis bath after being separated from the framework 15, configuring the mesh portion 12 of the conventional roller screen.
  • a thinner, acetone or toluene can be used as a polishing material.
  • a mixture of the thinner and toluene as the polishing material is preferable.
  • the master roller screen 20 which is used for manufacturing the roller screen according to the present invention can be thus obtained by the above-mentioned process.
  • a step is performed that the master roller screen 20 is dipped into the electroforming bath 30 to form a roller screen by an electroforming process.
  • FIG. 8a illustrates the electroforming bath 30 for the performance of the forming step of the roller screen 100 and a rotating apparatus 40 which functions to rotate the master roller screen 20 in the electroforming bath 30.
  • a nickel ingot 50 is further provided in the electroforming bath 30 in which the sulfamic acid nickel bath is more preferable than others.
  • the nickel ingot 50 accelerates the growth of nickel layers on the master roller screen 20.
  • the supporting frame 44 of the rotating apparatus 40 includes a plurality of supporting members which are extended radially from the central shaft with a uniform angle of arrangement and a plurality of rotating roller each of which is rotatably supported by an end portion of each of supporting members.
  • summit portions 15b of a master roller screen framework 15a are attached to the summit portions 15b of a master roller screen framework 15a, so that nickel layers can be grown vertically from every summit portion 15b.
  • the master roller screen 20 rotates itself being in contact with outer surfaces of the rotating rollers and the nickel layers of which cross-sectional shape is circular can grow. Accordingly, the roller screen 100 which grows on an outer surface of the master roller screen 20 also have a substantially circular cross-sectional shape.
  • This electroforming process is continued until the nickel layer grows to a predetermined scale to about 0.2mm in depth and about 640mm in circumference.
  • the master roller screen 20 on which the roller screen 100 is formed is taken out from the electroforming bath 30. Subsequently, after washing the master roller screen 20 with pure water, the roller screen 100 is separated from the master roller screen 20.
  • the roller screen 100 can be easily separated from the master roller screen 20 by a weak force.
  • the roller screen 100 has a roller screen mesh portion 110 having a plurality of minute hole 112; and a skirt portion 120, which is formed in a body with the roller screen mesh portion 110 along both circumferential edges of the roller screen mesh portion 110, for reinforcing the mesh portion 110.
  • the mesh portion 110 and the skirt portion 120 is obtained by performing the steps of: manufacturing the master roller screen 20 by using the base 10; forming the roller screen 100 by the electroforming process of dipping the master roller screen 20 into the electroforming bath 30; and separating the roller screen 100 from the master roller screen 20 on which the roller screen 20 is formed.
  • the master roller screen 20 is made by the manufacturing method described above.
  • the size of the mesh portion 110 and the skirt portion 120 is 0.2mm in depth and 640mm ⁇ 0.5mm in circumference, respectively, and an opening ratio of the mesh portion 110 is about 28%.

Abstract

Disclosed are a roller screen capable of being manufactured by an electroforming process with a low cost and a method of manufacturing the same. In the manufacturing method of the roller screen, a master roller screen is manufactured by using a base and then a roller screen is manufactured by growing nickel layers on a framework of the master roller screen in an electroforming bath. The master roller screen is manufactured by a process that a base is subjected to an electrolysis process to remain a framework and then the base is covered with a releasing agent so that summit portions of the base are exposed. According to the method of manufacturing the roller screen, high quality roller screens can be obtained with a low manufacturing cost without using expensive patterning and etching apparatuses.

Description

ROLLER SCREEN AND METHOD FOR MANUFACTURING THE SAME
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The present invention relates to a roller screen, and more particularly to a roller screen manufactured by an electroforming process in which a master roller screen is pre-made by using a prior roller screen as a base, and to a method for manufacturing the same.
2. Description of the Background Art
Generally, a roller screen is used for fine printing characters, graphics or patterns on textile fabrics such as chemical fiber in a rapid process. The roller screen is usually made from a conductive metal such as nickel in a shape of cylindrical thin film, and typically has a mesh portion and a skirt portion. The mesh portion has a plurality of holes forming a structure similar to beehive, while the skirt portion which is adjacent to the mesh portion integrally extends to the outer edge of the roller screen by a predetermined width from both ends of the mesh portion. Typically, the roller screen is manufactured by coating a photosensitizer on the outer surface of a thin film cylinder made in advance from a metal such as nickel. Then, a plurality of holes is patterned on the coated photosensitizer, which is then exposed to a laser beam. Thereafter, the exposed portion of the cylinder is subjected to a cleaning and etching process to obtain a roller screen having a mesh portion patterned by a plurality of holes having a certain geometrical shape. The shape of the holes on the mesh portion is typically of a beehive shape.
However, in manufacturing the roller screen by conventional methods, highly expensive patterning, exposing and etching apparatuses are required, which consequently increases the manufacturing cost of the roller screen.
Further, the problems with defective products are prevalent in the conventional methods. U.S. Patent No. 5,282,951 (issued to Stork Screens, B.V., 1994) discloses a method for forming a sieve material having a low internal resistance.
As shown by FIG. 1 , a sieve material 3 grows in vertical directions 'a' and 'b' from a plain of a sieve skeleton 1 , and also grows in horizontal directions 'c' and
'd' from a base of the sieve skeleton 1. According to the invention, the sieve skeleton which is prepared in advance is thickened in an electrolysis bath with metal to obtain the sieve material. As a result, a sieve material having a high uniformity and concentration with reduced internal stress can be obtained.
However, in the above-described method for manufacturing a sieve material, there is a drawback in that many sieve skeletons are needed for the mass production, since each sieve material requires one skeleton. In addition, because the metal layer is grown in four directions, a problem of encroaching the holes of the roller screen by the metal layer may occur.
Disclosure of Invention In view of the foregoing, it is an object of the present invention to provide a method for manufacturing a roller screen which is advantageous for the mass production of precise roller screens at a low manufacturing cost by utilizing a master roller screen, in absence of expensive patterning or etching apparatuses.
It is the second object of the present invention to provide a roller screen manufactured by the method of the present invention.
According to a preferred aspect of the present invention to accomplish the first object, there is provided a method of manufacturing a roller screen, including the steps of: manufacturing a master roller screen by using a base; forming a roller screen by performing an electroforming process of dipping the master roller screen into an electroforming bath; and releasing the roller screen from the master roller screen on which the roller screen is formed.
It is preferred that the step of manufacturing the master roller screen includes the steps of: (a) subjecting the base in an electrolytic bath; (b) forming a framework by separating metal ions from the base by electrolysis of the base in the electrolytic bath; (c) coating the framework with a releasing agent by charging the releasing agent over holes sectioned by the framework; and (d) flattening one side of the framework by removing the releasing agent from the one side of the framework.
According to another preferred aspect of the present invention to accomplish the second object, there is provided a roller screen including a roller screen mesh portion in which a number of fine holes are formed; and a skirt portion extending in a body from both circumferential edges of the roller screen mesh portion for reinforcing the roller screen mesh portion.
The roller screen according to another aspect of the present invention is manufactured by the method of the present invention.
The method of the present invention has such an advantage in that the roller screen can be made with a high precision without using the expensive patterning and etching apparatuses.
Further, according to the method of the present invention, since metal layers grow only in a vertical direction on the base framework by the master roller screen formed by the base, a stronger roller screen can be manufactured at a low cost without size reduction of the holes on the roller screen caused by encroachment of the growing metal layers.
Brief Description of Drawings
The above objects and other advantages of the present invention will O 01/21403
become more apparent by describing in detail embodiments thereof with reference to the attached drawings in which:
FIG. 1 shows a sectional view of a sieve material deposited with a metal layer according to a prior art; FIG. 2 shows a perspective view of a roller screen base used for manufacturing a roller screen according to the present invention;
FIG. 3 is an enlarged view of a portion A in FIG. 2 showing a hole structure of the base which is used for manufacturing the roller screen according to the present invention; FIG. 4 is a cross-sectional view taken along a line B-B' in FIG. 3 showing a framework of the base which is used for manufacturing the roller screen according to the present invention;
FIG. 5 is an enlarged view of a framework structure after electrolysis of the base which is used for manufacturing the roller screen according to the present invention;
FIG. 6 is an enlarged cross-sectional view taken along a line C-C in FIG. 5 of a framework after electrolysis of the base which is used for manufacturing the roller screen according to the present invention;
FIG. 7 is a cross-sectional view of a master roller screen obtained by charging a releasing agent over the framework of the base, which is used for manufacturing the roller screen according to the present invention, by exposing only summit portions thereof;
FIG. 8a shows a schematic cross-sectional view of an electroforming bath together with a rotating apparatus on which the master roller screen is mounted, according to the present invention;
FIG. 8b shows an enlarged cross-sectional view of a part of the rotating apparatus shown in FIG. 8a, in which transition paths of Ni ions deposited on the master roller screen are represented; FIGs. 9a to 9c shows enlarged cross-sectional views for describing an explanation of a series of the manufacturing procedures from the growing of Ni layers from the master roller screen within the electroforming bath of FIG. 8a to the final steps of obtaining of the roller screen according to the present invention; and
FIG. 10 shows a perspective view of a roller screen manufactured by growing Ni layer from the master roller screen according to the present invention.
Best Mode for Carrying Out the Invention
A method for manufacturing a roller screen according to the preferred embodiment of the present invention will be described in detail below with reference to drawings.
FIGs. 2 to 7 illustrate a process of manufacturing a base 10 for a master roller screen which is used for manufacturing a roller screen 100 and the master roller screen according to one aspect of the present invention. In FIGs. 2 to 7, the method of manufacturing a roller screen of the present invention includes the steps of: manufacturing a master roller screen 20 by using a base 10; forming the roller screen 100 by performing an electroforming process of dipping the master roller screen 20 into an electroforming bath 30; and releasing the roller screen 100 from the master roller screen 20 on which the roller screen 100 is formed.
The step of manufacturing the master roller screen includes the steps of: (a) subjecting the base 10 in an electrolytic bath (not shown); (b) forming a framework 15a by separating metal ions from the base 10 by electrolysis of the base 10 in the electrolytic bath; (c) coating the framework 15a with a releasing agent by charging the releasing agent over holes 13 sectioned by the framework 15a; and (d) flattening one side of the framework 15a by polishing an outer 01/21403
surface of the base 10 with a polishing material to remove the releasing agent from the framework so that only the summit portions of the framework 15a is exposed.
A conventional roller screen can be used as the base 10, and FIGs. 2 and 3 illustrate the conventional roller screen used as the base 10 and a structure of the holes 13 of the roller screen, respectively. As shown by FIGs. 2 and 3, it can be seen that the base 10 consists of a mesh portion 12 in which a number of holes 13 are formed and a skirt portion 14 extending by a predetermined width from both circumferential edges of the mesh portion 12. The mesh portion 12, as shown by FIG. 3, includes many beehive-shaped holes 13.
FIG. 4 is a cross-sectional view taken along a line B-B' which shows the framework 15 forming the beehive-shaped holes 13. As shown by FIG. 4, a cross-sectional shape of the framework 15 of the base is rectangular. In the manufacturing step of the master roller screen, the conventional roller screen which is used as the base 10 is dipped into a electrolysis bath to perform electrolysis process. During the electrolysis, metal ions are dissolved in the electrolysis bath after being separated from the framework 15, configuring the mesh portion 12 of the conventional roller screen. The electrolysis process is continued until the framework 15 configuring the mesh portion 12 of the conventional roller screen has a predetermined depth and shape, and thereby obtaining the master roller screen which is used for manufacturing the roller screen 100 according to the present invention (the steps (a) and (b)).
FIG. 5 and 6 illustrates a framework 15a of a base 10a obtained from the electrolysis of the conventional roller screen and a cross-section of the framework 15a, respectively. In FIG. 5, it should be noted that the framework 15a has a summit portion 15b and slant surfaces originating from the summit portions 15b. In FIG. 6, it can be seen that the framework 15a of the base 10a has a lozenge shaped sectional view. The framework 15a of the base 10a is gradually lowered and reduced to a predetermined height and width due to the separation of the metal ions from the framework 15a during the electrolysis process. That is, the framework 15a of the base 10a after the electrolysis process can be reduced in its height and width as small as half of the framework.
The master roller screen 20 can be made by using the base 10a which is obtained from the above-described electrolysis process. At first, the base 10a is coated with a releasing agent 16 as shown by FIG. 7. A synthetic resin such as silicon resin can be used as the releasing agent 16. When coating the base 10a with the releasing agent 16, it is preferable that the holes 13a formed by the framework 15a of the base 10a should be filled with the releasing agent 16 so that the base 10a is fully coated with the releasing agent 16.
Next, the releasing agent 16 is removed from an outer surface of the base 10a on which the releasing agent 16 is coated. When removing the releasing agent 16, it should be noted that the releasing agent filled within the holes 13a of the base. In order that only the summit portions of the framework 15a is exposed, the releasing agent 16 is removed by polishing an outer surface of the base 10 with a polishing material until the outer surface of the base 10a is flattened (step (d)).
In the step (d) of flattening the base 10a filled with the releasing agent 16, a thinner, acetone or toluene can be used as a polishing material. Using a mixture of the thinner and toluene as the polishing material is preferable.
The master roller screen 20 which is used for manufacturing the roller screen according to the present invention can be thus obtained by the above-mentioned process.
After the preparing of the master roller screen 20, a step is performed that the master roller screen 20 is dipped into the electroforming bath 30 to form a roller screen by an electroforming process.
FIG. 8a illustrates the electroforming bath 30 for the performance of the forming step of the roller screen 100 and a rotating apparatus 40 which functions to rotate the master roller screen 20 in the electroforming bath 30. In the step of manufacturing the roller screen 100 by using the master roller screen 20, one is selected from a watt bath, a chloride nickel bath, brom-fluoride nickel bath, or sulfamic acid nickel bath can be utilized as the electroforming bath 30, in which the sulfamic acid nickel bath is more preferable than others. In the electroforming bath 30 a nickel ingot 50 is further provided. The nickel ingot 50 accelerates the growth of nickel layers on the master roller screen 20.
In reference to FIG. 8a, the rotating apparatus 40 has a driving shaft 42, on which a first sprocket 42a is mounted, for transmitting a driving force from a driving power source (not shown); a supporting frame 44, wherein a second sprocket 44b is mounted thereon and is detachably arranged across the electroforming bath 30, for supporting the master roller screen; a chain 46, which chains the first sprocket 42a of the driving shaft 42 with the second sprocket 44a of the supporting frame 44, for transferring a rotating force of the driving shaft 42 to the supporting frame 44; and a guide (not shown), which one end thereof is connected to the driving shaft 42 so as to surround the first sprocket 42a and the other end thereof is connected to the supporting frame 44 so as to surround the second sprocket 44a, for protectively guiding the chain 46.
The driving shaft 42 is supported by a supporting member (not shown) which is installed outside of the electroforming bath 30 and receives the driving force from the driving power source. The first sprocket 42a is fixed to the driving shaft 42 with a key (not shown).
The supporting frame 44 is detachably mounted in the electroforming bath 30. The second sprocket 44a is mounted on one end of a central shaft of 01/21403
the supporting frame 44. The supporting frame 44 of the rotating apparatus 40 includes a plurality of supporting members which are extended radially from the central shaft with a uniform angle of arrangement and a plurality of rotating roller each of which is rotatably supported by an end portion of each of supporting members.
A bearing member is applied to respective end portion of the supporting members and is passed through by a shaft of the rotating roller. Accordingly, the rotating roller can be rotated on its shaft. On the other hand, one end of a shaft among all the shafts of the rotating rollers is connected with the central shaft of the supporting frame 44 so as to be rotated by a driving force therefrom. As a driving force transmission device between the supporting frame 44 and the shafts of the rotating rollers, one can be selected from a set of chain and sprocket, a set of V-type belt and pulley, or a pair of gears.
Meanwhile, in FIG. 8a the supporting frame 44 of the rotating apparatus is illustrated to have a rectangular form, but any other polygonal forms such as a hexagonal form or an octagonal form except a circular form can be employed if the form can allow the nickel ions to be imported obliquely to the summit portion 15b of the master roller screen rotated to be grown vertically.
In the rotating apparatus as described above, the master roller screen 20 is mounted on the supporting frame 40 so that the master roller screen can be supported by the rotating roller of the supporting frame and the rotating roller is rotated by a transferred force through the central shaft of the supporting frame 44 from the driving shaft 42.
Accordingly, as the rotating roller rotates on the shaft thereof, the master roller screen 20, being supported by the rotating roller, turns the central shaft of the supporting frame 44. As such, during the rotation of the master roller screen 20 by the rotating roller, nickel ions dissolved in the electroforming bath 30 and newly ionized nickel ions from the nickel ingot 50 in the electroforming bath 30 O 01/21403
are attached to the summit portions 15b of a master roller screen framework 15a, so that nickel layers can be grown vertically from every summit portion 15b.
After the nickel layers grow to a predetermined height and width, every nickel layer grows only in upward direction and horizontal growth of each of nickel layers is prevented by so-called a screen effect of other nickel layers grown at its neighboring master roller screen framework 15a due to the rotation of the master roller screen 20 (refer to FIG. 8b).
For the acceleration of vertical growth of the nickel layer by obliquely introducing the nickel ions to the summit portion 15b, not only the rotating roller is rotated on its shaft but also the supporting frame 44 is rotated on the central shaft 44a.
If both the supporting frame and the rotating roller of the supporting frame rotate simultaneously, the master roller screen 20 rotates itself being in contact with outer surfaces of the rotating rollers and the nickel layers of which cross-sectional shape is circular can grow. Accordingly, the roller screen 100 which grows on an outer surface of the master roller screen 20 also have a substantially circular cross-sectional shape.
As described above, if the master roller screen 20 is installed on the rotating apparatus 40 and the rotating apparatus 40 is rotated in the electroforming bath 30, the master roller screen can be prepared which has nickel layers vertically grown with a predetermined depth on the outer surface thereof. The step of forming the rolling screen 100 according to the present invention is performed by using this master roller screen.
In a state when the master roller screen 20 is mounted on the rotating apparatus 40 as described above and the rotating apparatus 40 is dipped into the electroforming bath 30 so that the rotating apparatus 40 is positioned between two nickel ingots 50 in the electroforming bath 30, a negative terminal of a power source is connected to the master roller screen 20 and a positive O 01/21403
terminal of the power source is connected to the nickel ingot 50 in the electroforming bath 30. when the power source is turned on, current flows to the nickel ingot 50 by way of the master roller screen 20 and the electroforming bath 30, while nickel ions separated from the nickel ingot 50 and the nickel ions resolved in the electroforming bath 30 move into the master roller screen 20 through the electroforming bath 30.
During the electroforming process for manufacturing the roller screen 100 in the electroforming bath 30, the nickel in ion state in the electroforming bath 30 and the nickel ionized from the nickel ingot 50 are deposited on the summit portion 15b of the master roller screen framework 15a to make a densely deposited nickel layers (refer to FIGs. 9a to 9c). Particularly, during the rotation of the rotating apparatus 40 in the electroforming bath 30, every nickel layers which is grown by oblique introduction against the framework 15a of the master roller screen 20 has a vertically grown shape on the master roller screen 20. Furthermore, the nickel layers do not encroach the space in the holes of the mesh portion and thus the roller screen 100 obtain the same shape as the master roller screen 20.
This electroforming process is continued until the nickel layer grows to a predetermined scale to about 0.2mm in depth and about 640mm in circumference.
After the completion of forming the roller screen 100 with the master roller screen 20 by the electroforming process, the master roller screen 20 on which the roller screen 100 is formed is taken out from the electroforming bath 30. Subsequently, after washing the master roller screen 20 with pure water, the roller screen 100 is separated from the master roller screen 20. The roller screen 100 can be easily separated from the master roller screen 20 by a weak force.
By the method of manufacturing the roller screen as described above, it 01/21403
becomes possible to make the roller screen 100 which has the same scale as a conventional roller screen used as the base 10 and, furthermore, the mass-production of the roller screen 100 can also be realized by repetitively using the master roller screen 20. Roller screens thus obtained have the same whole-shape, height, depth and openness of hole as the conventional rolles screens.
Herein below another embodiment of roller screen will be described with reference to the accompanying drawing.
The roller screen 100, as shown in FIG. 10, has a roller screen mesh portion 110 having a plurality of minute hole 112; and a skirt portion 120, which is formed in a body with the roller screen mesh portion 110 along both circumferential edges of the roller screen mesh portion 110, for reinforcing the mesh portion 110. The mesh portion 110 and the skirt portion 120 is obtained by performing the steps of: manufacturing the master roller screen 20 by using the base 10; forming the roller screen 100 by the electroforming process of dipping the master roller screen 20 into the electroforming bath 30; and separating the roller screen 100 from the master roller screen 20 on which the roller screen 20 is formed.
The master roller screen 20 is made by the manufacturing method described above.
Preferably, in the roller screen 100, the size of the mesh portion 110 and the skirt portion 120 is 0.2mm in depth and 640mm ± 0.5mm in circumference, respectively, and an opening ratio of the mesh portion 110 is about 28%.
Industrial Applicability
As described above, a high quality roller screen having a mesh portion with well-defined openness can be obtained without using costly conventional patterning and etching apparatuses. As a result, the method of the present O 01/21403
invention makes it possible to realize a low manufacturing cost for the roller screens.
While the present invention has been particularly shown and described with reference to particular embodiments thereof, it is understood that the present invention should not be limited to this preferred embodiment, but various changes and modifications can be made by one skilled in the art within the spirit and scope of the invention as hereinafter claimed.

Claims

O 01/21403CLAIMS
1. A method of manufacturing a roller screen, comprising the steps of: manufacturing a master roller screen by using a base; forming a roller screen by performing an electroforming process of dipping the master roller screen into an electroforming bath; and releasing the roller screen from the master roller screen on which the roller screen is formed.
2. The method as claimed in claim 1, wherein the step of manufacturing the master roller screen comprises the steps of: (a) subjecting the base in an electrolytic bath; (b) forming a framework by separating metal ions from the base by electrolysis in the electrolytic bath; (c) coating the framework with a releasing agent by charging the releasing agent over holes sectioned by the framework; and (d) flattening one side of the framework by polishing one side of the base to remove the releasing agent from the framework so that only the summit portions of the framework is exposed.
3. The method as claimed in claim 2, wherein the releasing agent is silicon resin.
4. The method as claimed in claim 2, wherein a polishing material used for the polishing in the step (d) is one selected from a group of thinner, acetone and toluene.
5. The method as claimed in claim 4, wherein the polishing material used for the polishing in the step (d) is a mixture of the thinner and toluene. O 01/2140
6. The method as claimed in claim 1, wherein metal ions are introduced obliquely to the summit portions of the master roller screen and are vertically grown by deposition.
7. The method as claimed in claim 1 , wherein in the step of forming the roller screen, the roller screen is manufactured by growing nickel layers on the summit portions of the master roller screen while rotating the master roller screen.
8. The method as claimed in claim 7, wherein in the step of forming the roller screen, the master roller screen is rotated by a rotating roller.
9. The method as claimed in claim 7, wherein in the step of forming the roller screen, the master roller screen is rotated by a rotating roller and a supporting frame.
10. The method as claimed in claim 9, a cross-sectional shape of the master roller screen mounted on the supporting frame is a polygonal shape.
11. The method as claimed in claim 10, the cross-sectional shape of the master roller screen mounted on the supporting frame is a rectangular shape.
12. The method as claimed in claim 7, wherein in the step of forming the roller screen, a nickel ingot is further provided in the electroforming bath for accelerating growth of the nickel layers.
13. The method as claimed in claim 1, wherein in the step of forming the roller screen, the electroforming bath is one selected from a group of a watt bath, a chloride nickel bath, a brom-fluoride nickel bath, or a sulfamic acid nickel bath.
14. A roller screen, comprising: a roller screen mesh portion being formed with a plurality of minute holes thereon; and a skirt portion extending in a body from both circumferential edges of the roller screen mesh portion, for reinforcing the roller screen mesh portion, wherein the mesh portion and the skirt portion are manufactured by a process includes the steps of: manufacturing a master roller screen by using a base; forming the roller screen by an electroforming process of dipping the master roller screen in the master roller screen; and separating the roller screen from the master roller screen.
15. The roller screen as claimed in claim 14, the step of manufacturing the master roller screen comprising the steps of: (a) subjecting the base in an electrolytic bath; (b) forming a framework by separating metal ions from the base by electrolysis of the base in the electrolytic bath; (c) coating the framework with a releasing agent by charging the releasing agent over holes formed on the base; and (d) flattening one side of the framework by polishing an outer surface of the base with a polishing material to remove the releasing agent from the framework so that only the summit portions of the framework is exposed.
16. The roller screen as claimed in claim 15, wherein the releasing agent is silicon resin.
17. The roller screen as claimed in claim 15, wherein in the step (d), the polishing material is one selected from a group of thinner, acetone and toluene. O 01/21403
18. The roller screen as claimed in claim 17, wherein in the step (d), the polishing material is a mixture of the thinner and the toluene.
19. The roller screen as claimed in claim 14, wherein in the step (b) of forming the roller screen, metal ions are introduced obliquely to summit portions of the framework of the master roller screen to be vertically grown.
20. The roller screen as claimed in claim 14, wherein in the step (b) of forming the roller screen, the roller screen is manufactured by growing nickel layers on the summit portions of the master roller screen while rotating the master roller screen.
21. The roller screen as claimed in claim 20, wherein in the step (b) of forming the roller screen, the master roller screen is rotated by a rotating roller.
22. The roller screen as claimed in claim 20, wherein in the step (b) of forming the roller screen, the master roller screen is rotated by a rotating roller a supporting frame.
23. The roller screen as claimed in claim 20, wherein a cross-sectional shape of the master roller screen mounted on the supporting frame is a polygonal shape.
24. The roller screen as claimed in claim 20, wherein a cross-sectional shape of the master roller screen mounted on the supporting frame is a rectangular shape. O 01/21403
25. The roller screen as claimed in claim 14, wherein in the step (b) of forming the roller screen, the electroforming bath is one selected from a group of a watt bath, a chloride nickel bath, a brom-fluoride nickel bath, or a sulfamic acid nickel bath.
26. A roller screen manufactured by one manufacturing method selected from claims 1 to 13.
PCT/KR2000/000816 1999-09-04 2000-07-27 Roller screen and method for manufacturing the same WO2001021403A1 (en)

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KR19990038220 1999-09-04
KR1999/38220 1999-09-04
KR19990042439 1999-09-28
KR1999/42439 1999-09-28

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Publication number Priority date Publication date Assignee Title
KR101673139B1 (en) * 2014-04-15 2016-11-22 이여형 Desolving tube using mesh screen with venturi-structured sectional area

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5641398A (en) * 1979-09-10 1981-04-18 Taiyo Kogyo Kk Manufacture of nickel sylinder for rotary screen printing
JPS59185339A (en) * 1983-04-07 1984-10-20 Konishiroku Photo Ind Co Ltd Photosensitive body of screen
US4772540A (en) * 1985-08-30 1988-09-20 Bar Ilan University Manufacture of microsieves and the resulting microsieves
US4913783A (en) * 1988-05-02 1990-04-03 Piolat Industrie Process for the manufacture of a perforated nickel frame by electroforming
US5282951A (en) * 1990-12-24 1994-02-01 Stork Screens, B.V. Method for forming a sieve material having low internal stress and sieve material so obtained

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8005427A (en) * 1980-09-30 1982-04-16 Veco Beheer Bv METHOD FOR MANUFACTURING SCREEN MATERIAL, SCREENING MATERIAL OBTAINED AND APPARATUS FOR CARRYING OUT THE METHOD

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5641398A (en) * 1979-09-10 1981-04-18 Taiyo Kogyo Kk Manufacture of nickel sylinder for rotary screen printing
JPS59185339A (en) * 1983-04-07 1984-10-20 Konishiroku Photo Ind Co Ltd Photosensitive body of screen
US4772540A (en) * 1985-08-30 1988-09-20 Bar Ilan University Manufacture of microsieves and the resulting microsieves
US4913783A (en) * 1988-05-02 1990-04-03 Piolat Industrie Process for the manufacture of a perforated nickel frame by electroforming
US5282951A (en) * 1990-12-24 1994-02-01 Stork Screens, B.V. Method for forming a sieve material having low internal stress and sieve material so obtained

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KR100373056B1 (en) 2003-02-25
KR20010029849A (en) 2001-04-16

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