How to choose heat shrinkable film during packaging of heat shrink packaging machine
The heat shrinkable packaging of the heat shrink packaging machine is also called shrink packaging or heat shrink packaging; it uses a heat shrinkable plastic film as a packaging material, which is directly wrapped on the food or covered on the inlet of the packaged container when heat shrinks. When the plastic film package passes through a box heating chamber or a heat shrink tunnel, it is subjected to a certain temperature, and the heat shrinkable plastic film shrinks by itself, thereby achieving the purpose of closely adhering to the packaged article.
In the normal working process of heat shrink packaging machine, the selection of heat shrinkable film material is very important. Firstly, the film is required to have a certain shrinkage rate in both the longitudinal and transverse directions. The shrinkage rate = (L1-L2) / L1 * 100%, L1 is The original length, L2 is the shrinkage length after immersion of 1 to 2S in water at 120 ° C. According to the heat-reducible plastic film having a heat-recovering property, when a film is formed from a raw material. The film is heated and stretched in advance, and is cooled to become a shrink film. When the film is reheated, it shrinks and recovers. Therefore, the film is required to have a shrinkage ratio of about 50% in the longitudinal and lateral directions, and has sufficient heat seal strength and tensile strength, impact strength, tear strength, proper moisture resistance and oil resistance. At present, the shrink film used in many applications is polyvinyl chloride (PVC), polyethylene (PE) and polypropylene (PP), followed by polyvinylidene chloride (pvdc), polyester (PET), polystyrene (EPS). ), ethylene-vinyl acetate copolymer (EVA) and the like. The relationship between shrinkage temperature and shrinkage of the main film is shown in the figure below.
The heat-shrinkable plastic film has better strength, transparency and elongation than ordinary plastic films. When the temperature is extended, the elongation of the film is increased to 1:4 to 1:7 before condensation, while the elongation of the ordinary film is only 1:2. There are two types of heat shrinkable films, one of which is a biaxial type extended heat shrinkable film, which has almost the same axial and lateral axial extension. This film can be used to package fresh food, food tray packaging and container closures. The other type is a one-axis type extended heat shrinkable film that extends in only one direction and is suitable for shrink packaging and label packaging of tubular films, such as label packaging for wine containers, sealed packaging for plastic bottles, glass bottles and lids, fresh Casing packaging of foods such as fruits and vegetables.
The heat shrinkable film packaging of the heat shrink packaging machine is characterized by rapid packaging, quick work efficiency, low cost, convenient operation, convenient transportation and sales of the product, and is widely used in the food processing industry.
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