Packaging method of shrink packaging machine
The main types of shrink packaging machines are horizontal shrink packaging machines, L-type shrink packaging machines, four-side sealing shrink packaging machines, and other types of shrink packaging machines. The horizontal shrink packaging machine is similar to the horizontal filling packaging machine in structure and process, but the packaging materials used are different, and the heat sealing parameters are different. The type and the vertical sealing type are often used in small automatic packaging machines. L-type shrink packaging machine, the packaging material is a double-layered film folded in the middle, and the packaged items are sent between the two layers of film, and then moved with the film to the L-shaped sealer for three-side heat sealing and cut off, and finally sent to After the heat shrinking chamber, the sealing method of the L-type shrink packaging machine generally adopts the pulse sealing method. The sealing blade is mostly made of round or flat round nickel-chromium wire bent into an 'L' shape and embedded in the sealer. The L-type shrink packaging machine has a simple structure and is convenient to operate and replace the film. The size of the package depends on the size of the machine. The small machine is suitable for the package of 300*300mm, and the package size of the large machine can reach about 500*1200mm. Four-side sealing shrink packaging machine, which is to cover the pushed items with upper and lower layers of film, and then seal the front and back and both sides to form a four-side sealed package. Generally, bar type cutting tools are used for heat sealing, and side sealing can be rod type or roller type. When the length of the packaged item is short, the sealing rod can be used, but when the length of the item is long, the technology of making a long sealing rod becomes difficult, and it is more suitable to use a roller type heat sealing device. When the side sealing is performed, the pulling speed of the film is not a constant value. Before the film reaches the tension state, the pulling speed is faster (higher than the conveying speed of the item, and increases with the height of the item); and when the film is tensioned, the pulling speed is faster. The pulling speed must be automatically synchronized with the speed of the article conveyor. This requirement is generally realized by the variable speed motor and the corresponding speed control device separately provided on both sides. This type of model is most suitable for box packaging, the size of the package is 200~500mm wide and 250~1500mm long. The packaging capacity varies with the length of the product. When the length is 1000mm, it can pack 8~10 pieces per minute. Other types of shrink wrapping machines, sleeve wrapping machines are mainly used for wrapping relatively regular items and not completely sealed. The packaging principle and process flow can be seen in Figures 6~35. The width of the packaging material used is larger than that of the four-side sealing packaging machine. The structure and packaging process of the long-sized article packaging machine are similar to those of the horizontal packaging machine. The difference is that the horizontal sealing device is controlled according to the detection signal to adapt to the horizontal sealing and cutting of articles of different lengths. Large-weigherpackaging machines are mainly used for the cumulative packaging of multiple items or boxes (often with trays or pallets). Packing speed varies depending on item size. The allowable packaging height and width are generally more than one meter. In this type of machine, part of the packaging and heat shrinking are done at one time in the heat shrinking chamber, and the packaging speed can reach 100 pallets/hour.
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