If, after printing, the plastic ink film is peeled (punch and cast and plastic woven bags), the printed white ink ink film is pasted by the plastic braid (without adhesive strength). Improper surface treatment, and second, the white ink is not holding the sticky force (ie, adhesion strength), the third is the ink surface is dry and wet, there is water or residual solvent, or the production of the ambient temperature is too high.
The treatment method is: the ink should increase the drying speed of the white ink or adjust the gradient of the solvent volatilization of the ink system (including the printing dilution ink), use the mixed solvent as much as possible or avoid the use of a slow-drying solvent; exchange the connection of the high resin softening point in the white ink system. Material or heat-resisting mica powder; add tackifying resin or add a little thermosetting resin when designing the formula; reduce the temperature when coating (recovery) film; the substrate should be processed to 38 dyne to 42 dyne.
Q: In the past few years of use, the users generally do not have the problem of poor adhesion fastness. In recent years, the company has produced several batches of ink in a customer's yellow bag with no attachment fastness. What is the reason? ? How should I solve it?
A: Simply speaking, it is caused by excessive plasticizer or surface active dispersant in the yellow plastic bag system, followed by the excessively high crystallinity of the yellow packaging substrate system and the unprocessed printing.
Treatment methods are: First, add tackifying resin or cross-linking agent to the ink system, and secondly, select the resin with low softening point and good frost resistance as the printing ink binder.
Q: Woven bag printing ink. Can only add mixed solvents, can not use cheap gasoline or alcohol diluted ink, how to do?
A: When designing a woven bag printing ink formulation, it is only necessary to adjust the solubility of the mixed solvent to 10.5.
Q: There is no rose-red pigment, only permanent purple, pink lake, Qinglian Lake, Lisol red, how to formulate rose red ink?
Answer: First, use permanent purple and pink lakes with rose red, the second is the use of Qinglian Lake and Lisuoer Dahong test after the close.
Q: Can refined methanol be used in waterborne coatings? What is its volatilization rate?
A: The volatile rate of refined methanol is 6 and the solubility is 14.6. It can be applied to aqueous or water-soluble coating systems. Not only can improve the filming speed of the coating, but also the cost is low and the quality is stable.
Q: What is the basis for the dissolution of the resin? How to prevent ink dry?
A: The solvent is usually selected according to the solubility of the resin (the two solvents are also the reference solvent solubility). However, based solely on the solubility between the two is not enough, but also refer to the hydrogen bond between the two to design ink formulations;
The use of multiple mixed solvents is better than a single solvent, because it can achieve the balance of volatilization speed when printing ink is formed and maintain the stability of the ink, or use a variety of resins.
Q: We originally used a polyvinyl butyral resin of 5 seconds as the connecting material for the varnish. Can we use only 7 seconds of polyvinyl butyral in the warehouse?
A: It can be used, but the latter is slightly less glossy under the same viscosity conditions. Because of the high viscosity of polyvinyl butyral, the solid content in the varnish system is lower than that of the former, and the leveling property is slightly inferior.
Q: What is the problem with double-barrelled bag filters that do not filter out ink?
A: The pressure is too small, followed by the high ink level.
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