JPH0791773B2 - Manufacturing method of tubular screen material for rotary screen printing - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a tubular screen material for rotary screen printing, which has a uniform mesh over the entire circumference.

2. Description of the Related Art The rotary screen printing method is a method of printing an object by rotating a cylindrical screen and pressing the ink provided inside the screen from the inside with a squeegee. With this method, the plate is separated at the same time as printing, so that a uniform printed film can be formed on the target object, and since it is continuous printing by rotary motion, high-speed printing is possible. There is ink inside the cylindrical screen. Therefore, the solvent is less volatile and dust is less likely to enter, which is advantageous in various points such that the ink characteristics can be kept constant.

Conventionally, as a screen used for this purpose, a screen in which a surface of a cylindrical mesh made of stainless steel is plated with nickel and the plated layer is etched so as to draw a predetermined pattern has been used.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, the above-mentioned stainless steel cylindrical mesh is expensive, and since forming a pattern by etching after performing metal plating on the same requires a high technique, the same pattern can be obtained. However, when the number of patterns is large or the amount is small, there is a problem that the plate cost is too bulky as compared with the production amount of the printed product.

In order to solve this problem, the present inventor instead of the cylindrical mesh made of stainless steel, nylon, polyester, to create a cylindrical mesh body from a plain fabric such as silk,
We tried to form a pattern on the cylindrical mesh body using a photosensitive resin, but when processing a plain woven fabric into a tubular shape, it is difficult to process the seam part, and strictly speaking, the mesh is uniform at the seam. Because the sex is impaired,
It was not immune to the loss of accuracy of the plate obtained from it.

Therefore, the present inventor has considered that a seamless tubular woven fabric is woven at once by a double-weave woven fabric, and tried to use this tubular woven fabric as a material for a rotary screen. Is obtained by a weaving method in which two plain weaves are piled up and down and knotted at both ends, it is inevitable that the texture of the weft near the knotted ends is slightly denser than other parts. As a result, it was not possible to obtain a product having a completely uniform mesh.

In view of the above situation, it is an object of the present invention to obtain a tubular screen material for rotary screen printing having a uniform mesh over the entire circumference, and to obtain it industrially advantageously. .

Means for Solving the Problems The method for producing a tubular screen material for rotary screen printing of the present invention comprises a low melting point component having a melting point of 90 to 140 ° C. for a sheath component, and a melting point of 155 to 180 ° C. for a core component and the above low temperature. A sheath-core type composite fiber, which is a high melting point component having a melting point higher than the melting point of the melting point component by 20 ° C. or a component having no melting property, is used, and a large number of the composite fibers are obliquely crossed with respect to the axial direction of the roller. Then, the roller is wound from one end side to the other end side of the roller, and a large number of the composite fibers are further obliquely crossed on the opposite side from the one side to the other end side of the roller. The composite fibers are arranged so as to intersect the roller surface by winding toward each other, and then the arranged fibers are heat-fused to each other at the intersections, and then the fusion product is cooled and then pulled out from the roller. Is characterized by

The tubular screen material obtained by the method of the present invention is not a woven fabric, but has a texture structure of uniform intervals similar to the woven fabric,
Moreover, since the fibers are firmly fused and integrated with each other at the crossing points, the mesh has a structure in which the mesh does not collapse.

The present invention will be described in detail below.

In the present invention, a sheath-core type composite fiber in which only the sheath component is formed of the low melting point component is used as the fiber material. That is, a fiber in which the core component is a high melting point component or a component having no meltability, while the sheath component is a low melting point component, and these are arranged in a concentric sheath core type or an eccentric sheath core type is used.

Here, as the low-melting point component and the high-melting point component, polyethylene, polypropylene, polyamide, polyester, polyvinyl chloride, in consideration of fiber forming property, fiber strength and the like,
Polyvinylidene chloride, polyvinyl alcohol and the like are preferably used.

Considering the overall balance of fiber strength, texture, elongation, and handleability of the obtained tubular screen material, the sheath component and core component satisfying the following conditions are used.

As the low melting point component which is the sheath component, one having a melting point in the range of 90 to 140 ° C. is highly practical, and therefore, a component having such a melting point is used. If the melting point is lower than this range, the fibers may soften during use and work may not be carried out smoothly.On the other hand, if the melting point is higher than this range, the fibers may be arranged so as to cross the roller surface. The fusing operation of can not be performed smoothly.

As the core component, a high melting point component having a melting point of 155 to 180 ° C. and a melting point higher than the melting point of the low melting point component by 20 ° C. or more, or a component having no meltability is used. Otherwise,
When the low melting point component is melted, the core component is softened or melted by heating to lose the fiber strength.

In the present invention, a large number of the composite fibers are wound around the roller obliquely with respect to the axial direction of the roller from one end side to the other end side of the roller, and a large number of the composite fibers are further provided on the roller. Is obliquely crossed to the side opposite to the above and is wound from one end side to the other end side of the roller, whereby the composite fiber is arranged so as to cross the roller surface.
The reason why a large number of conjugate fibers are wound at one time is that one filament is poor in industrial productivity.

After the placement, the placement is placed under heating conditions above the melting point of the sheath component and below the melting point of the core component, and the placed composite fibers are heated and fused together at their crossing points to integrate them, and then the fusion is performed. After cooling the kimono, pull out from the roller.

The above-mentioned arrangement, heat fusion, and drawing steps will be further described with reference to the drawings.

FIG. 1 is an explanatory view showing an example of the method of the present invention and an apparatus for carrying out the method.

FIG. 1 (a) shows a winding step, (1) is a fiber disposing roller, (2) is its shaft, (4) is a bobbin for supplying a large number of fibers, and (5) is the bobbin ( 4) A shaft for reciprocating the fiber disposing roller (1) from one end to the other.

FIG. 1 (B) shows a heating and fusing step, in which the fiber arrangement wound around the fiber arrangement roller (1) is heated in the heater (3).

FIG. 1C is a drawing process, in which the fiber arrangement integrated and fused by the previous process is drawn.

Through the above steps, the target tubular screen material is obtained. This tubular screen material has a uniform mesh over the entire circumference, and the fibers are firmly fused and integrated with each other at the intersecting points.

The tubular screen material thus obtained is extremely useful as a tubular screen material for rotary screen printing.

Action In FIG. 1, while rotating the fiber placement roller (1) around its axis (2), a large number of composite fibers fed from the bobbin (4) are applied to the fiber placement roller (1). It is wound so that it is oblique to the axial direction. On this occasion,
By reciprocating the bobbin (4) along the shaft (5) from one end of the fiber arranging roller (1) to the other end, the bobbin (4) is superposed on the composite fiber wound in the forward path, and the composite fiber in the return path is obtained. The tape is wound obliquely on the side opposite to the above.

After the winding is finished, when the fiber arrangement wound around the fiber arrangement roller (1) is heated in the heater (3), the fiber arrangement is fused at the intersection.

After cooling, by pulling out the fusion-integrated fiber arrangement from the fiber arrangement roller (1), the intended tubular screen material for rotary screen printing can be obtained.

EXAMPLES Next, the present invention will be further described with reference to Examples.

Example 1 Using an eccentric composite fiber having a thickness of 6 to 18 denier, which has polyethylene having a melting point of 130 ° C. as a sheath component and polypropylene having a melting point of 163 ° C. as a core component, and under the following conditions according to the process shown in FIG. A cylindrical screen material was manufactured.

The obtained tubular screen material had a uniform mesh over the entire circumference, and was firmly fused and integrated at the crossing points of the composite fibers, and was optimal as a tubular screen material for rotary screen printing. .

-The diameter of the fiber disposing roller (1) is 150 mm.-The number of the composite fibers fed out from the bobbin (4) is 100.-The angle of the composite fiber fed out from the bobbin (4) with respect to the axial direction of the fiber disposing roller (1) (outward path). 60 ° ・ Same (return) 120 ° ・ Temperature inside the heater (3) 145 ° C Effect of the Invention The tubular screen material for rotary screen printing obtained by the method of the present invention has a uniform mesh over the entire circumference. Moreover, since the fibers are firmly fused and integrated with each other at the crossing points, the mesh eyes are not distorted.

In addition, in the production, a method in which a large number of composite fibers are supplied and wound, and then the composite fibers are heated and fusion-bonded in an overlapping state is adopted, so that compared to the method of weaving or knitting fibers. Much more productive and industrially advantageous.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of the method of the present invention and an apparatus for carrying out the method, wherein (a) is a winding step,
(B) is a process fusion process and (C) is a drawing process. (1) ... Roller for disposing fibers, (2) ... Shaft, (3) ...
… Heating machine, (4) …… bobbin, (5) …… axis

Claims (1)

[Claims] 1. A low melting point component having a melting point of 90 to 140 ° C. as a sheath component, a high melting point component having a melting point of 155 to 180 ° C. as a core component and a melting point of 20 ° C. or more higher than the melting point of the low melting point component, or melting property. Using a sheath-core type composite fiber which is a component that does not have, while winding a large number of the composite fiber obliquely with respect to the axial direction of the roller from one end side to the other end side of the roller, Arranged so that the composite fibers intersect the roller surface by obliquely crossing the opposite side from the above and winding from one end side to the other end side of the roller. After that, the arranged fibers are heat-fused to each other at their crossing points, and the fused material is cooled and then withdrawn from the roller, thereby producing a tubular screen material for rotary screen printing.