Vacuum packaging machines
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Vacuum packaging machines (Fig. 1) are used most often for meat packaging. The finished bag (usually welded on three sides) is used for packing a layer product.
The bag with the product is placed in a chamber with a hermetically sealed lid. The open side of the bag is placed between the welding plate and the rubber band on the clamping lever. After closing the lid, air is sucked out through the vacuum line. When the machine's vacuum gauge shows the required air vacuum, the current is applied and the bag holes are welded. 
Forming a closed package can be done by immersing it in hot water. At high throughput, closed bags are passed through a forming tunnel, a closed chamber where the product moves on a conveyor. Heated air is supplied to the chamber. At the inlet and outlet, rubber curtains prevent warm air from escaping the chamber.
Vacuum packaging of products
Vacuum packaging machines are widely used in various types of designs. In two-chamber machines, one chamber is used for vacuuming and sealing the product, while the other chamber is used to place the product in a bag.
In a semi-automatic continuous machine, the product is fed on a conveyor to a chamber with an opening and closing lid. After closing the bag, the conveyor takes the packaged product out of the chamber.
In a vacuum packaging machine, the bags are made by the machine itself. The bags are formed by the movement of two straps of packaging film (lower and upper). Only the product needs to be manually placed on the lower film.
