What are the key points of control in the production of PVC skinning and foaming board?
What are the key points of control in the production of PVC skinning and foaming board?It is necessary to make the blisters of PVC skinned foam board dense and evenly distributed. In addition, there is a hard and dense surface layer, which is the key to be controlled in the production process:
1. The extruder and die can provide continuous high pressure to make the foaming agent dissolve in the melt. The higher the melt pressure, the higher the foaming efficiency, the denser the surface layer and the higher the melt strength;
2. The gap of setting template should be appropriate, that is to provide enough space for foaming, and to put appropriate pressure on foaming melt;
3. The melt pressure after extrusion should be very low, so that the gas can escape from the melt at the exit of the die and form a large number of bubbles immediately.
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