Heat shrinkable film has light weight and low density

The heat shrinkable film is light in weight and low in density. The density of individual plastics is similar to that of water, about 1/6 of the density of steel and 1/2 of the density of aluminum. That is, under the same volume, plastic parts are much lighter than metal parts. Although plastic has a low density, its mechanical strength is much higher than ceramics, glass, wood, etc. Some plastics are even comparable to steel. This is of special significance for products such as vehicles, ships, airplanes, daily necessities and household appliances that require increased weight to replace steel with plastic. Excellent processing performance and obvious economic benefits. Plastics have the characteristics of easy molding and short molding processing cycle. The consumption of plastic parts requires less investment in special equipment and low energy consumption. Compared with the processing of metal parts, the molding cycle is short, the processing procedures are few, and most of the scraps in the processing process can be recycled and reused. The cost of consuming plastic parts per unit volume is only 1/10 of that of non-ferrous metals. It can be seen that the overall economic benefits of plastic parts are obvious. At present, plastics have evolved from replacing local metal, wood, leather and inorganic materials into an indispensable chemical material in various sectors. It ranks among the three traditional materials of metal, fiber material and silicate, and is indispensable in all walks of life. One of the main information. PVC can be divided into soft PVC and hard PVC. Among them, hard PVC accounts for about 2/3 of the market, and soft PVC accounts for 1/3. Simply put, an aqueous solution of salt undergoes chemical decomposition under the action of electric current. This process produces chlorine, caustic soda and hydrogen. Refining and cracking petroleum or gasoline can produce ethylene. When chlorine and ethylene are mixed, ethylene dichloride will be produced; ethylene dichloride can be converted to produce chlorinated vinyl, which is the basic component of polyvinyl chloride. The polymerization process connects chlorinated vinyl molecules together to form a polyvinyl chloride chain. The polyvinyl chloride produced in this way is in the form of a white powder. It cannot be used alone, but it can be mixed with other ingredients to produce many products. Chlorinated vinyl was first synthesized in the Justus von Liebig laboratory in 1835. The polyvinyl chloride was synthesized by Baumann in 1872. Polyvinyl chloride is flame-retardant (flame retardant value above 40), high chemical resistance (resistant to concentrated hydrochloric acid, 90% sulfuric acid, 60% nitric acid and 20% sodium hydroxide), mechanical strength And the advantages of good electrical insulation. But its heat resistance is poor, with a softening point of 80°C, it starts to decompose and change color at 130°C, and precipitate HCI. Heat shrinkable film is widely used in the outer packaging of various products such as food, medicine, sterilized tableware, stationery and sports goods, craft gifts, printed matter, hardware and plastic products, telephones, electronic appliances, etc., especially in irregularly shaped items or commodities. Combined (cluster) packaging can not only meet the functions of moisture-proof, dust-proof, touch-proof, transparent display, etc., but also increase the attractiveness of the product appearance. It can also be used to replace all kinds of cartons, which not only saves packaging costs, but also In line with packaging trends. Shrink film (bags) can be processed into special-shaped bags such as flat bags, arc-shaped bags, trapezoidal bags, and three-dimensional bags. The heat shrinkable film is a small heat shrinkable packaging equipment meticulously manufactured in accordance with international standards. It has the characteristics of simple operation, wide application range, good sealing, high transparency, low cost, and high grade. It is suitable for packaging small and medium batch products. The heat shrinkable film machine and the sleeve labeling machine are used online to form a sleeve labeling shrinking machine line, which is widely used in the fully enclosed heat shrinkable packaging of medicines, food, beverages, stationery, ceramics, daily chemicals, auto parts, knitting, electronic audio and video products, etc. , Is the sleeve label shrinking machine of the downstream packaging line. Comparison of physical properties of BOPP smoke film, POF heat shrinkable film and PE, PVC shrinkable film