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 Linyang - An expert in PVC tarpaulin / PVC film industry since 2002

The process of compression molding in the production of tarpaulins

At present, many products in plastic tarpaulin manufacturers are produced by molding. First, a specified amount of material is added to the mold as needed, and the amount of material added directly affects the density and size of the product. After feeding, even if the male mold and the female mold are closed, use the fast speed first when closing the mold, and change to the slow speed when the negative and male molds are in quick contact. To be cured, it is kept at the molding temperature for a period of time, so that the polycondensation reaction of the resin reaches the required degree of crosslinking, so that the product has the required physical and mechanical properties. For products with forming rods or some inserts, special tools should be used to remove the forming rods, etc., and then demolding. After demoulding, the cavity and the mold surface of the mold are usually blown with compressed air. If the fixation on the mold is tight, it can be cleaned with a copper knife or a copper brush, or even a polishing agent brush. In order to further improve the quality of the product, the tarpaulin is often post-treated at a higher temperature after demoulding, and the post-treatment can make the plastic solidify more thoroughly.

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