For high-quality extrusion molding manufacturers, chlorinated polyvinyl chloride resin must be dried before being put into production. It must be dried in an oven at 80 ℃ for 2 ~ 4H. If necessary, the raw materials after high-speed mixing shall be screened once with a 40 mesh screen, and then put into the hopper of the extruder for production (Note: it is not suitable to heat up the mixture of high-speed mixer). The extruder for CPVC pipe extrusion is selected.
High quality extrusion molding suppliers should pay attention to the performance conditions such as exhaust and process temperature control stability during the operation of the extruder barrel. If these two conditions fail to meet the production requirements, the extrusion molding of CPVC pipe will increase great difficulty or even cannot be produced. When the inner wall of the formed pipe is uneven, acrylate processing aids (or methyl methacrylate copolymer) should be added or appropriately added to the raw material formula to improve the melting temperature of the mixing of CPVC and PVC resins.
At the same time, pay attention to the stability control of mandrel temperature. Extrusion blow molding is a main blow molding method, which is mainly used for parison processing. According to the blank feeding mode, extrusion blow molding can be divided into continuous extrusion blow molding and discontinuous extrusion blow molding.