What are the factors affecting the quality of PVC advertising board
Insufficient stability will affect the entire board surface, the board surface will be yellow, and the foamed sheet will be brittle. Insufficient melt strength will cause the foamed sheet to have large cells and long longitudinal section.
. Lubricants, lubricants are divided into external lubricants and internal lubricants. The external slip is good for demoulding, which is good for the surface finish of the sheet. The external slip is too little, the temperature of the extruder zone is not easy to control, and it is easy to heat up. The temperature of the confluence core is high, and there are problems such as large bubbles, string bubbles and yellowing in the middle of the plate, and the surface of the plate is not smooth
. Poor dispersion will cause the surface of the sheet to be non-smooth. For screws with poor dispersion, uneven dispersion sometimes occurs.
The more foaming agent, the better the foaming, the lower the density and the lighter.
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