Why does the PU synthetic leather recently produced by our factory always have pinholes in the coating?

In general, impregnated polyurethanes appear pinholes on the surface of the coating during the production process. The reasons are as follows: 1. The amount of antifoaming agent is not enough, and the amount of antifoaming agent needs to be increased at this time; The quality of the foaming agent is too bad. At this time, the defoamer needs to be replaced. 3. The viscosity of the slurry is too high and should be adjusted to between 0.2~0.4Ps. 4. The static degassing time of the slurry is not enough. when the need to extend the slurry bubble standing off time; 5 mass difference fabric itself, can be solved by a method of replacing a base fabric;. impregnation tank 6 hours, irrational structure, then impregnating tank must be replaced.
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