Screen plate capable of local control of yarn thickness and its manufacturing method

Abstract

A screen that can locally control the thickness of the yarn, comprising: a screen frame; a screen cloth that is stretched by a predetermined tension and fixed on the screen frame and includes a plurality of metal warps and a plurality of metal wefts arranged staggered up and down, and a plurality of metal warps The warp threads and the multiple metal weft threads have a first yarn thickness; the polymer material layer covers the mesh cloth, and the polymer material layer includes a multi-opening pattern, wherein the multi-opening pattern includes a plurality of metal warp threads and a plurality of metal weft threads A plurality of mesh cloth openings, a plurality of metal warp threads and / or a plurality of metal weft threads forming a plurality of mesh cloth openings have a second yarn thickness, and the second yarn thickness is smaller than the first yarn thickness; wherein, the arrangement adjacent to the multi-opening pattern The plurality of metallic warp threads and / or the plurality of metallic weft threads also have a second yarn thickness. Furthermore, the present invention also provides a method for making a screen that can locally control the yarn thickness.

Description

technical field [0001] The present invention relates to a structure of a printing screen made of a printing mesh having a warp and weft structure and a manufacturing method thereof, in particular to a method of adjusting the opening pattern on the printing mesh, the yarn thickness and Adjacent to the opening pattern, the yarn thickness is composed of warp and latitude threads, so as to control the yarn thickness around the opening pattern to increase the ink penetration of fine circuit graphics and reduce the height difference of the printed circuit. The printing screen and its manufacturing method. Background technique [0002] With the advancement of technology, the circuit pattern design on the circuit board and the printed circuit specifications required by the circuit board are becoming more and more precise and precise, such as passive component circulation lines, finger line lines on solar cells, etc. , so the printing screen of the circuit pattern also needs a mesh s...

AI Technical Summary

Problems solved by technology

[0003] In precision screen printing, the fine-lined mesh is an important link affecting ink penetration. We know that the ink permeability of the screen is related to the opening ratio of the mesh, and the opening ratio of the mesh is related to the mesh number and wire diameter of the mesh. The following formula is shown: mesh opening ratio = mesh area (A) / screen area (B), so we know that under the same mesh number, the finer the wire diameter, the larger the mesh opening ratio and the better the ink permeability. But at the same time the cost difference will be greater

For example, taking 360 mesh (mesh) and wire diameter of 20um as an example, once the wire diameter reaches 16um, 13um...11um, the price will increase by multiples per meter. In addition to the price, the traditional drawing technology needs to achieve finer wire The threshold of yarn technology is higher, so how to reduce the cost and increase ink penetration to achieve precision printing is a problem that needs to be overcome. If the line impedance becomes larger, the efficiency will decrease instead, and it will cause material waste, so the yarn thickness is also an important factor affecting the printing result.

[0004] In addition, in the prior art, although there is a printing screen structure in which the screen is formed by electroforming or the steel plate is processed by laser to increase the opening ratio of the mesh and increase the amount of ink penetration, but the electroforming or The steel plate lacks the characteristics of warp and weft weaving mesh, the strength of the fine line screen produced by electroforming is insufficient, and the screen formed by the steel plate is insufficient in elasticity, and the required printing effect cannot be achieved in off-plate printing

Furthermore, in the screen structure formed by weaving warp and weft threads, although the warp threads and weft threads can be woven with different wire diameters, the thickness of the warp and weft threads cannot be locally controlled, so that it is impossible to achieve multiple screens on one screen. In an opening pattern, reduce the yarn thickness of its warp and weft threads to increase ink penetration and reduce the height difference of printed lines

[0005] On the other hand, in the actual application of the screen, after printing, it is often found that there is only partial ink penetration failure, such as just at the turn or right angle of the opening pattern, or the opening pattern is just at the node of the latitude and longitude lines. However, it is impossible to locally adjust the latitude and longitude line diameters of these places to increase the amount of ink penetration. In addition, the latitude and longitude nodes are also the cause of the height difference of the printed circuit.

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