Improving the quality of PVC foam board is always the goal of PVC foam board manufacturers, which is related to the vital interests of customers, but also with peers to win the key. So how to improve the quality of PVC foam board? The following PVC foam board manufacturers GeGe technical staff to provide you with detailed answers.
Improve the quality of PVC foam board methods.
One, the process control of PVC foam board
First of all, the process control of PVC foam sheet, because plastic foam forming is divided into the following processes: ① formation of bubble nucleus ② expansion of the bubble nucleus and curing of the bubble body. PVC is a straight-chain molecule with short molecular chain and low melt strength, which is not enough to cover the bubbles during the process of expanding the bubble nucleus into bubbles, and the gas will easily overflow and merge into large bubbles, reducing the quality of the foamed sheet.
Two, improve the melt strength of PVC
The main factor to improve the quality of PVC foam sheet is to improve the melt strength of PVC. From the analysis of the processing characteristics of polymer materials, there are various ways to improve the melt strength of PVC, but the effective way is to add additives to improve the melt strength and reduce the processing temperature.
PVC is an amorphous material, the melt strength decreases as the melt temperature increases, and conversely, the melt strength increases as the melt temperature decreases, but the role of temperature reduction is limited and only plays an auxiliary role. Melt strength increases with the increase in the content of foam conditioning agent. In general, as long as the screw has sufficient dispersion and mixing ability, the addition of high viscosity foam conditioning agent to improve the melt strength effect is more obvious.
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