1. membrane washing: before replacing the mould, cut the bottom membrane with scissors at the membrane roller position, clean all the membranes on the membrane clamp, and then remove the material holder;

2. Bleeding: Check whether the molding and vacuum studio of the packaging machine are in a lower position. If it is in the low position, press the gas source master valve button in the main screen of the touch screen, and turn the key to the off position to release the gas in the equipment; If the two studios are not in the low position, it is necessary to manually lower the two studios to the low position, and then let off the gas in the equipment. The gas in the equipment must be prevented from being removed to ensure the safety when replacing the mold;

3. Replace the vacuum chamber mold: take the vacuum chamber mold out of the vacuum chamber with both hands and put it into the mold matched with the molding chamber. Wear protective gloves when taking and placing the mold to prevent the heating plate of the upper studio from being burnt;

4. Adjustment of longitudinal cutter of stretch film vacuum packaging machine.