1.Line distortion of screen printing machine
Too many screens are caused by loose screen templates; the distance between the positioning loose screen and the substrate changes; the included angle between the scraper and the substrate is incorrect, or the force is uneven; the consistency of the printed material is too thin or Too dry; after cleaning the printed surface of the reworked workpiece, the solvent should not be used for dry screen printing.
2, pattern or line flower
印刷 During the scraping process, the printed materials are mixed too thin and too hard. Uneven adjustment of printing material (uneven dispersion of solvent in printing material); after wiping the screen, the solvent or cleaning agent on the screen mold does not dry, or the surface cleaning agent does not dry or clean when the workpiece is reworked; after the first scraping , The sealing force of the printing material is too large, causing a small amount of printing material to be squeezed out of the screen; during the printing process, the moving speed of the squeegee changes too much in the effective area of the substrate, and printing stops or repeats. The fineness of the printed material does not match the selected screen.
3, pattern line edge burrs, notches, cams, etc.
The surface of the substrate is not clean and oily; the printing material is too sticky, the dirt on the screen mold is not removed, the particles of the printing material are large, and the high-mesh screen cannot pass; the screen drying speed is too fast, and the screen work place twitches; quick-drying The printing material failed to seal the net in time, resulting in netting; when scraping, the force was uneven, large or small. The surface of the substrate is uneven.
4. Pitting
Printing material is too sticky with impurities and blocked holes. Or the printing material is too sticky and the scraping force is not enough; when the printing material is mixed, the maturity period is not enough, the air bubbles remaining in the printing material will not completely disappear, and the air bubbles will stick to the printing material after screen printing. The surface of the substrate is not clean and has the effects of dust, etc., and the printing force is inappropriate, light, uneven or scratched, and the strength is insufficient; the printing material on the substrate is wet, causing dust in the storage place; under the conditions of suitable printing materials, the screen The distance from the substrate is too large; the screen is not cleaned thoroughly before printing.
5. Screen sticking board for screen printing machine maintenance
There is a problem with the angle between the squeegee and the substrate. It is not a line contact, but a facet contact. The distance between the screen and the substrate is small, or the screen tension is small; when screen printing, the imprint force is too large, and the ink layer is thick and sticky. The printed material is too thick and so on.
6. Solution
Carefully analyze the reasons that affect quality and resolve them. For quality problems caused by non-scratch operations, such as screen stretching, optimal distance, screen printing template production, workpiece surface treatment, and selection of printing materials. , Will affect the quality of screen printing.
