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【 uncover 】 blowing method of heat shrinkable film
摘要：Heat shrinkable film is a kind of thermoplastic film which is oriented in the longitudinal and transverse tension of the film in the production process and shrinkable by heat in the use process. The heat shrinkability of film was applied as early as 1936. At the beginning, rubber film was mainly used to shrink and package foods that are not easy to preserve.
Heat shrinkable film is a kind of thermoplastic film which is oriented in the longitudinal and transverse tension of the film in the production process and shrinkable by heat in the use process. The heat shrinkability of film was applied as early as 1936. At the beginning, rubber film was mainly used to shrink and package foods that are not easy to preserve. Nowadays, heat shrinkable technology has been developed to almost use plastic shrinkable film to package all kinds of commodities. It is widely used in food and beverage, electronic products, automotive products, daily chemicals, stationery, medicine and other fields.
The blowing method of heat shrinkable film is generally divided into single bubble method, double bubble method and three bubble method.
The double bubble method is mainly used in the production of POF films. Due to the secondary expansion of the film, the tensile ratio of the film in the longitudinal and transverse directions can be controlled, and the tensile ratio is high. Through the control of the process formula, the shrinkage of the film can reach more than 70%. The main application fields of POF film are in some small packaging products.
With the application of heat shrinkable film in food, especially in cold and fresh meat, the production technology of three bubble heat shrinkable film came into being. As fresh meat products require high thermal shrinkage stability of film packaging, low thermal shrinkage temperature and good barrier performance, the ordinary double bubble method can not produce products that meet the requirements. The three bubble method can solve this problem well
The blowing method of heat shrinkable film is generally divided into single bubble method, double bubble method and three bubble method.
The double bubble method is mainly used in the production of POF films. Due to the secondary expansion of the film, the tensile ratio of the film in the longitudinal and transverse directions can be controlled, and the tensile ratio is high. Through the control of the process formula, the shrinkage of the film can reach more than 70%. The main application fields of POF film are in some small packaging products.
With the application of heat shrinkable film in food, especially in cold and fresh meat, the production technology of three bubble heat shrinkable film came into being. As fresh meat products require high thermal shrinkage stability of film packaging, low thermal shrinkage temperature and good barrier performance, the ordinary double bubble method can not produce products that meet the requirements. The three bubble method can solve this problem well
