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Analysis of the Working Process of Automatic Stretch Film Packaging Machine
The automatic stretch film packaging machine heats the film, and then uses the molded mold to fill the shape of the container, and then the product needs to be loaded into the molded lower mold cavity, and then vacuum packaged. The equipment mainly has four working processes, vacuum, heat sealing, return gas and circulation, which are introduced separately below.
Vacuum: the vacuum chamber of the stretch film vacuum packaging machine is closed, the vacuum pump works, the vacuum chamber starts to vacuum, the packaging bag is vacuumed at the same time, the pointer of the vacuum gauge rises, and the rated vacuum degree is reached (controlled by the time relay ISJ). The vacuum pump stops working and the vacuum stops. At the same time of vacuum work, the two-position three-way solenoid valve IDT works, the heat sealing air chamber is vacuum, and the hot pressing frame remains in place.
Heat sealing: IDT is broken, the outside atmosphere enters the heat sealing air chamber through its upper air inlet hole, and the heat sealing air chamber is inflated and expanded by using the pressure difference between the vacuum chamber of the stretch film vacuum packaging machine and the heat sealing air chamber, so that the upper heat pressing frame moves down and presses the bag mouth; At the same time, the heat sealing transformer works and starts sealing. At the same time, the time relay 2SJ works. After a few seconds, the heat sealing ends.
Air return: the two-position two-way solenoid valve 2DT is open, the atmosphere enters the vacuum chamber, the vacuum gauge pointer returns to zero, the hot pressing frame is reset by the return spring, and the vacuum chamber is opened. Cycle: Move the vacuum chamber of the above-mentioned stretch film vacuum packaging machine to another vacuum chamber, that is, enter the next working process, the left and right chambers work alternately, and the cycle goes back and forth.
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