Processing performance of PVC in vacuum forming machine

Therefore, for some processing molding (such as injection molding), it is necessary to appropriately reduce the molecular weight of the resin. According to the size of the molecular weight, domestic suspended polyvinyl chloride resin is divided into 1-7 grades, the larger the serial number, the smaller the molecular weight. XJ-4 (XS-4) to XJ-7 (XS-7) resins are often used in the manufacture of hard pipes, hard boards, etc. Other types of resins with lower molecular weight and higher molecular weight need to add a lot of plasticization due to higher Tf The agent reduces Tf, so it is often used in the manufacture of soft products. Polyvinyl chloride with an average degree of polymerization below 1000 is called low degree of polymerization polyvinyl chloride, which has good processing performance. Less plasticizer can be added during processing, so that the product will not be accelerated due to the migration of plasticizer. Ageing. Polyvinyl chloride products with low degree of polymerization have good transparency and are widely used in building materials, food and drug packaging materials and as substitutes for plexiglass products.