How is pvc shrink film made?

How is pvc shrink film made? Hello everyone, do you know shrink film? The author explains to everyone. 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. Forming processing extrusion flat blow method. The extruder used is an ordinary equal-distance unequal-depth gradual single-screw extruder with a screw diameter of Φ30mm, a length to diameter ratio of 25:1, a compression ratio of 3:1, and a cross-type flat blow head. The main process conditions are: the temperature of the back section of the extruder is 170~175℃, the temperature of the middle and front sections is 180~185℃, the temperature of the die head is about 180℃; the temperature of the hot water for heating and stretching is 85~95℃; The cooling water temperature is natural temperature. PVC heat shrinkable film is widely used in the food industry, such as the packaging of various fast food, lactic acid, beverage, dry food, native products, mineral water, cans and other products. PVC heat-shrinkable film bag is the most commonly used heat-shrinkable material in heat-sealing packaging. Through the hot air blow, the high-transparency heat-shrinkable film can be close to the surface of the article to improve the product grade, dust and moisture, and let the article show a new and perfect packaging effect. If you want to know more about the latest industry information about shrink film, please log in to our official website and we will bring you more practical tips.