After the PVC plastic sheet and the preservative are mixed and melted, a three-roll or four-roll calender is used to make a fully transparent or colored film that requires a thin thickness. The processed film is produced in this way and becomes an injection film. It can also produce and process packaging bags, ponchos, tablecloths, curtain cloths, inflatable toys, etc. according to cutting and hot melting. The large-format fully transparent film can be used for greenhouses, vegetable greenhouses and agricultural mulching films. The double-stretched film has the characteristics of shrinking when it encounters heat, which can be used for shrinking packaging.
When soft plastic PVC is mixed, an appropriate amount of styrofoam is added to make a plastic sheet, which is formed into a plastic foam by polyurethane foaming. It can also be used to basically form low-polyurethane foamed rigid PVC sheets and pvc profiles with an extruder, which can be used instead of wood. It is a new type of engineering construction raw material.