Three kinds of printing failure prevention
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Fault one
The ink film on the surface of the printed product is retracted, so that the printed surface is exposed to a large area, which is called shrinkage. This is due to poor wetting of the substrate by the printing ink. If the surface of the substrate contains oil stains, plastic surfaces and surface of electrodeposited printing inks containing excessive surface anti-scratch aids, the printing plate is not fluent or eccentric, and the direction of advancement is not (longitudinally absent), often causing partial shrinkage (fracture). ).
Precautions: Before printing, the surface of the substrate should be strictly degreased, and special printing ink with low surface tension should be selected.
Fault two pitting and pit
Since the wet ink film of the printing ink adheres to the foreign matter particles, the foreign matter particles spread on the wet ink film, repelling the surrounding ink to form a pit shape, which is also called a "cavity". Observed, it can be clearly seen that there are foreign matter particles in the center of the pit, which is also called "pitting". This phenomenon generally does not reveal the substrate of the substrate.
Precautions: Control the environment, improve cleanliness, ensure the purity of solvent or diluent, no foreign matter.
Fault three thick edge
The corners of the ink film are particularly thick after printing, and the finished product looks like a frame, called a "thick side." This is because the solvent of the wet ink film on the corners is faster than other places, causing the ink concentration to be too high, and the temperature is lower than elsewhere, forming a high surface tension zone, causing the adjacent ink to flow to the corners, thickening the ink there. membrane.
Precautions: Improve the thixotropy of printing inks, reduce printing pressure, and add appropriate rheological additives.