The production method of PVC heat shrinkable film

The production method of PVC heat shrinkable film Release time: 2017-11-21 　　 PVC heat shrinkable film has good transparency. The shrinkage rate is higher, between 40% and 60%, and its cost is lower. The tensile strength is large, The temperature shrinkage range is large, and the heat source is not high. The main processing heat is air, infrared or a combination of the two.　　Pvc heat shrinkable film can be produced by extrusion flat blowing method. Take the PVC heat shrinkable film for coating dry battery as an example. Its typical formula is: 100 parts of PVC-SG4 or PVC-SG5 resin; 4 parts of MCS; 4 parts of DOP; 3 parts of DCP; 2 parts of organic tin stabilizer; epoxy 2 parts of ester; 0.5 part of chelating agent; 0.2 part of stearic acid; 0.2 part of calcium carbonate. The above-mentioned materials are kneaded, plasticized, extruded, stretched and cooled to form a finished product.　　PVC heat-shrinkable film is made of PVC resin mixed with more than ten kinds of auxiliary materials and then inflated twice. Its characteristics are good transparency, easy shrinkage, high strength, shrinkage rate can be adjusted freely according to user needs, and strong operability. PVC shrink film can be made into tubular film, L-shaped half-fold film according to requirements, and can be processed into tube bags, flat bags, etc. The advantages are as follows: 　　 stretch packaging saves raw materials than shrink packaging, and does not require a heat shrink packaging machine, which saves energy; 　 high strength, large elastic tension, can be tightly wrapped in any geometric shape of goods, and can avoid damage to goods caused by strapping , It has good anti-loosening, rainproof, dustproof, anti-theft and other effects; 　　 can use high-performance resin and auxiliary materials, which can meet the needs of different users to the greatest extent; 　　PVC resin for PVC heat shrinkable film is mixed with more than ten kinds of auxiliary materials. It is made by secondary inflation, which is characterized by good transparency, easy shrinkage, high strength, and the shrinkage rate can be adjusted freely according to user needs, and it has strong operability. Its water resistance, flame retardancy, relatively low cost and high output are also favored by manufacturers, sellers and users.　　 At present, the annual demand for heat-shrinkable film in the four industries of beverages, cosmetics, and pharmaceuticals in my country is about 1 million tons, which shows that the market is unprecedentedly broad. Previous: Ops heat shrinkable film label expert teaches: how to use plastic bag with plastic wrap is the safest