Working process: first close the cover, and the vacuum pump extracts air from the working room. When the predetermined vacuum degree is reached, the vacuum pump stops working, the pressurizing valve is opened, the air bag is inflated, the pressure strip is pressed down on the sealing place, and the power is applied for heating. After the packaging bag is sealed, the vent valve is energized and opened, and the automatic gas is discharged and the cover is opened to complete a working cycle.
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