Which PVC resin raw material should be used to produce PVC heat shrink film?

The choice of PVC resin is the key to the production of pvc heat shrink film, should choose the resin that is easy to plasticize and has good comprehensive performance. In terms of the molecular mass of the resin, the general molecular mass increases, the thermal stability of the product, blown film calendering, tensile strength, impact strength and other properties will be improved to varying degrees, that is shrink film, the physical properties of the plastic product is improved.

But the pvc heat shrink film molecular mass is not the bigger the better, if the molecular mass is too large, it will cause the plasticizing temperature to increase, the fluidity of the resin, ductility deterioration, the heat stabilization system, the second blowing and expansion will cause difficulties. According to the experience, the shrink film selection of PVC-SG5, PVC-SG6 type resin can meet the requirements of the products on the heat shrinkage. Requirements for PVC resin whiteness, the film uniform particle size distribution. Before feeding the PVC resin and high mixing materials were sifted 2 times to reduce the crystal point of the product, impurities.