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Problems And Solutions Encountered In Flat Screen Printer Silk Printing

Data:2020-08-26
Abst:...

   1 Distorted lines

  Too many silkscreens are caused by the slack of the screen stencil; the distance between the loose positioning screen and the substrate changes; the angle between the squeegee and the substrate is incorrect, or the force is uneven; the thickness of the printing material is too thin or too dry; the workpiece is reworked After the surface of the printing plate is cleaned, the solvent will not be able to dry and screen printing.

  2 Patterns or lines are flowered

  The printing material is mixed too thinly, and the scraping is too strong; the printing material is unevenly adjusted (the solvent in the printing material is unevenly dispersed); the solvent or cleaning agent on the screen is not dry after the screen is wiped, or the surface of the workpiece is cleaned when rework The agent is not dry or clean; after the first squeegee, the sealing force of the printing material is too large, causing a small amount of printing material to squeeze out the mesh; the squeegee movement (moving) speed during printing is too different in the effective area of ​​the substrate, Pause or repeat printing, etc.; the fineness of the printed material does not match the number of screen meshes selected.

  3 Pattern edge burrs, gaps, cams, etc.

  The surface of the substrate is not clean and oily; the printing material is too sticky, there is dirt on the screen mold that has not been removed, the printing material has large particles, and the high-mesh screen cannot pass; the screen printing drying speed is too fast, and the screen printing workplace is exhausted; fast-drying The printing material fails to be sealed in time, resulting in netting; uneven force during scraping, large or small; the uneven surface of the substrate, etc.

  4 pits

  The printing material is too sticky, with impurities and blocked holes; or the printing material is too sticky, and the scraping force is insufficient; the maturity period of the printing material is not enough when the printing material is mixed, the residual bubbles in the printing material are not cleaned, and the bubbles are stuck on the substrate after screen printing. The surface of the substrate is not clean, affected by dust, etc., improper force during printing, light unevenness or scratching, insufficient force; the printing material on the substrate is not dry, caused by dust in the storage place; under the proper conditions of the printing material, the screen The distance between the substrates is too large; the pre-press screen is not cleaned thoroughly.

  5Silk screen sticky screen

  There is a problem with the angle between the squeegee and the substrate. The contact between them is not a line, but a small surface; the distance between the screen and the substrate is small, or the tension of the screen is small; when the screen printing, the imprinting force is too large, The ink layer is thick and sticky; the printing material is too thick, etc.

  6 solution

  Carefully analyze the reasons that affect the quality of flat screen printer, and solve them. As for the quality problems that occur in non-scratch printing operations, such as screen stretch problems, optimal distance problems, silkscreen template making problems, workpiece surface treatment problems and printing materials Matching and so on will affect the quality of silk screen printing.