Started with weapons, and later used for food packaging! One minute to understand heat shrinkable film

Many things we buy or use in our lives have flexible packaging materials. For example, a circle of publicity pictures on beverage bottles, plastic paper, plastic films on supermarket purchases, transparent bags covered with electronic products, and so on. These things have a common name, called PVC heat shrinkable film. Heat-shrinkable film first appeared in Germany during World War II. PVDC was used to pack weapons after biaxial stretching to prevent rust. Therefore, heat-shrinkable films have been used in industrial packaging from the beginning of industrial production, and then heat-shrinkable films have been used for food packaging. The development of the plastic packaging film industry in my country has mainly experienced more than 20 years, during which a certain scale has been formed. The heat shrinkable film industry occupies an important position in the packaging market, and it is also an industry that has a positive role in promoting the national economy. 1. Brief introduction of heat shrinkable film Heat shrinkable film, commonly known as shrink film, is a kind of film that can shrink greatly after being heated, so it can tightly wrap objects and maintain its shape for a long time. The heat shrinkable film is designed with the principle of stretching and orientation of polymer molecular chains, and is formed by the method of quenching and setting. The physical principle is: when the plastic raw material is heated and plasticized and extruded into a master film, the polymer is forced to stretch in both vertical and horizontal directions between the glass transition temperature and the drill flow temperature, so that the molecular chain of the polymer is stretched in the direction of stretching. Orientation, and then the polymer is rapidly cooled, and the molecular orientation is frozen. When the film is reheated to the 'thawing' temperature, stress relaxation occurs due to molecular motion, and the molecules return to their original state and shrink. Classification of heat shrinkable film 2. Application of heat shrinkable film Heat shrinkable film is used in the sales and transportation of various products. Its main function is to stabilize, cover and protect the product. At present, the food industry is the largest application market for heat shrink packaging materials. Heat shrinkable film is widely used in the packaging of various fast foods, lactic acid foods, beverages, beer cans, various alcohols, agricultural and sideline products, and local specialties. In the non-food field, the application of heat shrinkable film is also increasing, such as cosmetics, daily necessities, pharmaceutical products, electronic products, toys, building materials, handicrafts, etc. 3. Development history of heat shrinkable film industry Heat shrinkable film first appeared in Germany during World War II, and then popularized in Western Europe, Japan, the United States and other countries and regions. It has gone through more than 60 years of history. Divided by product development and competition, the development process of the heat-shrinkable film industry can be roughly divided into five stages: It started with weapons and then used for food packaging! One minute to understand the heat shrinkable film 4. Heat shrinkable film market scale Heat shrinkable film is developed with the development of its application technology, the main two uses are packaging and labeling. Due to its good transparency, cleaning, anti-theft, easy to use and other characteristics, heat shrinkable film is one of the fastest growing materials for film packaging; at the same time, due to its good printability, puncture resistance, abrasion resistance, shrinkage The heat-shrinkable film has become a bright spot in the label industry. In 2009, the global heat shrinkable film market was approximately US$9 billion. Among them, the US heat shrinkable film market is the largest, with a value of 1.8 billion US dollars in 2009. my country entered the field of heat shrinkable film in the early 1970s, initially developing PVC heat shrinkable tube film. The production of POF heat shrinkable film was started by Hubei Zhongda Plastics Co., Ltd. in 1997 when it introduced Italian equipment. In 1998, the production capacity was about 1,500 tons. With the development of the plastic packaging industry, my country's heat shrinkable film products have developed rapidly from variety to quantity. In 2006, the Plastic Packaging Committee of China Packaging Federation had nearly 20 heat shrinkable film enterprise members. By 2009, my country's heat shrinkable film The market size is close to 8 billion yuan. The market scale of the main products of my country's heat shrinkable film in 2009 is as follows: Previous: Application of pvc heat shrinkable film in daily life Next: Use method of heat shrinkable film for Maotai collection dry goods