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1) The surface finish of the mould cavity is too high, and the air is trapped on the smooth mould surface, which causes the product surface to produce spots. The surface of the cavi

(1) The thickness of the sheet is uneven. It is necessary to adjust the technological conditions of production and control the thickness uniformity of the sheet. When hot forming, it should be heate

PVC spot market atmosphere followed weakness, the mainstream prices have been loose. Due to the relatively tight supply of spot goods, the adjustment range of PVC spot price is not large, and it is

In December, the domestic polypropylene aggregate market continued to decline. The continuous high level of the supply side made the market more worried, while the follow-up strength of the demand s