First, the structural characteristics of the stretch film packaging machine There are two main parts: 1. Stretch forming: The main work is to pass the flat stretch film to the heating plate, increase the temperature of the film to increase the plasticity of the film, and then stretch the film into the same shape as the mold by compressing air and pumping. 2, heat-sealed packaging: the main job is to join the upper film and the lower film, the air inside the film is taken out to form a vacuum state, the upper film is in contact with the heat-sealing plate above, and the heat-heated film is heated by the heat-sealing plate, and the upper and lower films are The heat seal layer material is melted and then pressed by pressure to bond the upper and lower films together to form a whole body, ensuring that the product package does not leak. Other structures include: lower film unwinding, upper film unwinding, printed film cursor tracking, previous printing, horizontal longitudinal cutting, running chain, and the like. Second, the work situation 1, the lower film unwinding The lower membrane is mounted on the reel, and the clip on the chain clamps the side of the lower membrane, and the operation of the chain drives the lower membrane to move forward. In order to ensure the smoothness of the tension of the lower membrane during operation, the unwinding is installed at the unwinding position. Tension adjustment device. 2, stretch forming When the film is run under the stretched forming plate, the lower film is preheated by a hot plate, and then stretched. 3, the upper film unwinding The upper film is mounted on the reel, through the tension roller, the cursor tracking device and the guide roller. The heat sealing plate is heat sealed with the lower film. In order to ensure the flatness of the film tension during operation Stability, tension adjustment device is installed at the unwinding. 4, heat sealing device After the upper and lower membranes are combined, the heat sealing device first seals the upper and lower membranes, and then draws the upper and lower air into a vacuum state, and then the upper heat sealing plate heats the membrane to heat seal the upper and lower membranes under pressure to ensure that the upper and lower membranes are heat sealed together under pressure. The product does not leak after leaving the heat seal plate. 5, print date Depending on the requirements, the date of printing used is different, and the position of the device to be printed is different. The printing using the ribbon is before the heat sealing plate, and the ink is printed after the heat sealing plate. 6, cut The entire film with the product needs to be slit in both the transverse and longitudinal directions to cut the packaged product into individual products. 7, sterilization The packaged product needs to be sterilized in a sterilizer. Third, the basic parameters of the co-extrusion stretch film 1. The stretching forming temperature is generally controlled between 85-90 °C, but according to different equipment, different stretching forming effects, the temperature can be adjusted appropriately. 2, the mold required to stretch as much as possible to use a circular arc mold to ensure that the four corners after stretching have a certain thickness, reduce the amount of air leakage caused by damage after packaging, and to ensure the shelf life of internal products. 3, the heat sealing temperature is generally controlled between 125-130 ° C, in the case of ensuring the heat sealing fastness, the heat sealing temperature is required to be as low as possible to avoid the tensile deformation during the heat sealing process, and shrinkage, folding, sticking, Leakage phenomenon. Fourth, common problems and treatment measures 1, under the film Phenomenon: The lower film falls off the chain and cannot move synchronously with the chain, resulting in failure to properly stretch and package the product. Reason: (1) The width of the lower membrane is narrow. (2) The chain clamp is not tight. (3) The film is biased. Solution: (1) The slitting width of the lower film is widened to ensure matching with the width of the chain. (2) Repair the chain clip. (3) Adjust the position of the lower membrane to coincide the center of the lower membrane with the center of the chain. 2, the stretch forming effect is poor Phenomenon: the film is broken or poorly formed after stretching Reason: (1) The heating plate is not heated enough. (2) The heating temperature is not matched. When the temperature is too high, the film sticks to the heat sealing plate to increase the haze of the film, and the stretching is locally thin. 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