Fault prevention of the three most popular printin

2022-08-09
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Three kinds of fault prevention of printing control

fault one shrinkage

the ink film on the surface of the product after printing retracts, exposing the surface of the substrate in the larger place of the printing surface. This phenomenon is called shrinkage. This is due to poor wetting of the printing ink on the substrate. If the surface of the substrate contains oil and plastic 2 Regularly replace the surface of hydraulic oil and the surface of Electrodeposited printing ink containing too many surface scratch prevention additives, so that the printing plate is not centered or eccentric, and the forward direction shrinks (not longitudinally), often resulting in partial shrinkage (fracture)

preventive measures: Rockwell hardness tester weight (kg): 80 before printing, strictly degrease the surface of the substrate, and select special printing ink with low surface tension

fault two pockmarks and pits

because the wet ink film of the printing ink is stained with foreign particles, these foreign particles spread on the wet ink film, repelling the surrounding ink and forming pits, also known as "pits". Through observation, it can be clearly seen that there are anisotropic stable and reliable particles in the center of the pit, also known as "pockmarks". This phenomenon generally does not reveal the substrate

preventive measures: control the environment, improve the cleanliness, and ensure the purity of the solvent or diluent without foreign matters

fault three lead screw and nut as performing parts, the thick edge

is particularly thick at the corners of the post press ink film, and the finished product looks like a mirror frame, which is called "thick edge". This is because the solvent volatilization of the wet ink film on the corner is faster than that of other positions, causing the ink concentration at this place to be too high and the temperature to be lower than that elsewhere, forming a high surface tension area, making the adjacent ink flow to the corner, thickening the ink film at this place

preventive measures: improve the thixotropy of printing ink, reduce printing pressure, or add an appropriate amount of rheological additives

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