Here we will make an analysis on the causes of frothing and the ways to avoid it:

1、It is likely that the product is coated with glue, which has poor heat resistance！

2、Poor initial setting of adhesive coating；

3、Do not cover the glue, dissolve in；

4、Leave the hardener and glue unmixed for a while to allow them to react properly；

5、When the glue is thick, the PVC film is corroded and foamed, resulting in dense long vesicles. In other cases, if there is a bubble, you can see it at that time. When the glue is thick, you cannot see it at that time！

5、The raw material of plastic wave plate is the kind of recycled plastic steel material reprocessing, the surface of the plate is very smooth, not easy to cover, with a large amount of glue, covering machine speed can not open fast, otherwise it is very easy to blister。

6、Cold paste theory should also prepare a constant greenhouse! The coated product should be placed in a constant temperature chamber for 24 hours！

Avoid the use of PVC film coated hot sol-coated aluminum, aluminum alloy, PVC wood-plastic board, wavy board without foaming method：

1、After the product is ready, it should be left to cool for two to three days, and it should not be exposed to the sun or baked at a high temperature；

2、Aluminum is better, material surface can not have garbage dirt oil；

3、Try to choose high molecular weight coated hot sol water。