1. When the room packaging machine is packaging, the plastic bag containing the item is placed in the vacuum chamber, closed and evacuated. After reaching the predetermined vacuum degree, the heat sealing device is closed and the bag mouth is sealed. If vacuum inflation packaging is required, gas should be injected before sealing. This type of vacuum packaging machine has a high vacuum degree and can be adjusted according to needs, making it one of the most widely used types at present.
2. Thermoforming packaging machine, also known as continuous or deep drawing vacuum packaging machine. It adopts the method of hot forming sheet materials in the model, making packaging containers on the packaging, and then completing processes such as filling, capping, vacuuming, inflation, transverse cutting, and longitudinal cutting until the finished product is output.
3. The external suction packaging machine inserts an exhaust pipe into the opening of the bag, opens the suction valve, and the vacuum pump starts to extract air before sealing. To inflate, the required gas can be filled through the inflation valve after pumping, and then sealed. This mechanical structure is simple, but the vacuum degree is not too high. If breathing is used, a more ideal effect can be achieved.
4. Mechanical extrusion type, vacuum packaging machine uses sponge like items on both sides of the bag to remove air from the bag before sealing the bag opening, and then heat seals the bag opening. This mechanical vacuum pumping method is simple, but the vacuum degree is low.
The above four devices are classified according to the packaging method of vacuum packaging machines, and the overall working principle is similar. We can choose different types of products according to their packaging, which is very convenient.
