The working principle of a vacuum packaging machine is very simple. After placing items in a vacuum bag, the air in the packaging bag is extracted through the vacuum packaging machine to reach a certain vacuum degree (in a designated space, the state of gas below one atmospheric pressure is collectively referred to as vacuum, and the degree of gas dilution in a vacuum state is referred to as vacuum degree, usually expressed by pressure value). After completing the door sealing process, the principles of vacuum packaging machines with different structures also vary. The vacuum packaging production line includes a Parallel Seam Welding Machine and a Vacuum Reflow Oven.

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