1, the printing pattern should be the 70% largest diameter of the screen, otherwise there will be difficulties and four image deformation overprint. In general, the tension is balanced, except for fabric printing.
2, the correct sizing method:
* * * sizing to try to slow, the edges of the sizing try to choose a blunt edge, blunt edge angle and screen for right angle of 90 degree, this point out of the screen the smoothness of the best, but not too thin.
* * * slow sizing purpose is to let light-sensitive agent fully to fill the screen hole, too fast sizing will will appear to be compressed air to the mesh inside cause trachoma.
* * * on the precision of the screen for the first time in plasma after dry, must in the patch surface again at a sharp angle shave one to three photosensitive slurry, in order to ensure the smoothness of the screen.
The printed surface of the emulsion layer is lower than the general * * * screen printing ink layer thickness, as the dielectric layer of ink.
* * * the cleaned screen must be sealed to prevent further processing, dust.
* * * on goodwill light slurry screen must be as soon as possible exposure, such as temporarily unable to use must be used when black tape covered and sealed storage to prevent sticky dust staining and again damp or pre exposure etc. problems and to affect the printing effect.
3, select the appropriate exposure time:
The screen will not always * * * underexposed hardening in the developing process, the face scraping photosensitive milk rinse.
The sensitive emulsion layer is rough and fuzzy, which is the exact symbol of the exposure. Flushing is not sufficient, some dissolved emulsion viscosity in the screen of the through hole area, after drying, leaving only visible slag, appear uneven phenomenon hinders ink liquidity and appear jagged.
* * * underexposed screen printing ink solvent resistance and wear resistance is poor. Photographic exposure and not fully screen hard film.
How to calculate the correct exposure time * * *
Take an idle screen, good light on pulp after exposure to the test section as the optimum exposure time.
1, record the use of the light source, in order to replace the light source according to the exact time.
2, regular cleaning rubber skin, glass, shade, reflective cover.
3, regular cleaning and maintenance network in the real machine, printing machines and other equipment net.