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Screen printing common malfunction analysis

66 Published by admin May 28,2018

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In screen printing, due to ink selection, printing substrate characteristics, printing environmental factors uncertainty ect, easily lead to a variety of printing problems,affecting production cycle and product quality, bring losses to users and suppliers. How to avoid these losses?

1F.Print design is not clear.
Causes:
1, Inappropriate choice of ink or ink itself has quality problems;
2,Ink dry is too fast, so that make printing pattern or lines are not clear, resulting in pattern defects or line breakage phenomenon;
3, Ink viscosity is too high, when printing will generate pattern defects or broken line phenomenon;
4, When printing appears plug version phenomenon,it’ll affect the normal ink over ink;
5, when printing scraper pressure is not enough or uneven, resulting in uneven ink;
6, Substrate surface is uneven.

Approach:
1, Replace the appropriate ink;
2,Using a slower dry solvent dispatch ink;
3, Dilute ink or add thixotropic agent to reduce viscosity;
4,Correct choose slow drying solvent dilution ink, and pay attention to screen printing ink performance;
5, When printing increase the scraper force, while paying attention to scraper uniformity;
6, Handling substrate surface (such as printing rough substrate can be first used varnish or after other material backing then printing).

2F:Printing often happen plug version, affecting the normal use.
Causes:
1,Ink itself is dry too fast or in high temperature printing environment using fast drying solvent dilution ink;
2,Ink viscosity is too high, in the printing small text or lines easy caused plug board;
3,When adjusting ink added improper solvent (such as adding solvent solubility is not enough to cause ink back to crude, etc.);
4, Ink itself is too thick particles, and use plate network is too high,ink can not be normal network.

Approach:
1, Replace slow-drying ink or according to printing environment using a slower dry solvent blend ink;
2, Dilute ink or add thixotropic agent to reduce viscosity;
3, Using specified solvent dilution ink, so that the ink can be dissolved or dispersed normally;
4, Replace the higher fineness ink.

3F, Printed products have obvious textured.
Causes:
1,Ink is dry too fast;
2, Ink viscosity is too high, liquidity is not enough;
3, Use mesh is too thick.

Approach:
1, Using a slower dry solvent dispatch ink;
2, Dilute ink or add thixotropic agent to reduce viscosity ,to improve ink flow properties;
3, Using a higher mesh net yarn.

4F,Printing occur obvious water ripples.
Causes:
Ink is too thin or viscosity is too low, when printing network distance is too low, when printing produce ink stick back;
Exclusion method: Reduce ink added amount of solvent,maintain ink viscosity while properly increasing network distance,so that when printing can naturally rebound.

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