Stretch Vacuum Packing Machine

The automatic stretch vacuum packing machine is an advanced packaging solution that uses stretchable, thermoplastic film to form trays or containers, which are then sealed with film under vacuum or modified atmosphere conditions after filling. It is ideal for packaging a wide range of food items and small consumer goods-such as meat, seafood, pastries, desserts, and various ready-to-eat foods.

Unlike traditional methods, this machine eliminates the need for pre-made trays. It combines multiple functions into one streamlined system, including film forming, material loading, vacuuming or air flushing, heat sealing, and cutting. This integrated design ensures greater convenience, lower energy consumption, shorter packaging cycles, and significantly improved efficiency.

Model	SL-320
Power	18kw
Voltage	380v 50hz 3 phase
Capacity	12pcs per time 3-4 time/minute customized()
Upper film width	330mm
Lower film width	365mm
Control system	Siemens PLC + touch screen
Cooling water pressure	>0.15Mpa
Air pressure	>0.6Mpa
Dimension	6250*1200*1900mm

The working principle of the stretch vacuum packing machine involves first stretching and forming the bottom film to create a cavity for the product. The product is then placed into the formed cavity. In the vacuum chamber, the product is vacuum-sealed while the top and bottom films are simultaneously heat-sealed together. After sealing, the package is cut both crosswise and lengthwise to form individual units. The finished packages are then conveyed to the next stage of processing, while the leftover film material is collected by the waste collection system.

Vacuum packaging involves removing the air from the packaging bag and sealing it, effectively isolating the food from external air and contaminants. In a vacuum environment, the growth of microorganisms slows down, while protein breakdown and fat oxidation or rancidity are significantly reduced.

Additionally, vacuum packaging promotes the activity of lactic acid bacteria and anaerobic bacteria, which lower the pH level to around 5.6–5.8. This further inhibits the growth of harmful bacteria and helps extend the product's shelf life.

To achieve optimal preservation, vacuum packaging is often used in combination with other methods such as dehydration, the addition of seasonings or preservatives, fermentation, or freezing.

1. Photoelectric tracking system enables the use of both printed and transparent film, reducing packaging costs while enhancing overall product appearance.

2. Modular mold design allows for easy replacement and multi-purpose use on a single machine. Molds are equipped with an integrated cooling system for stable operation.

3. Optional coding or printing system can be added based on user packaging requirements for date, batch, or product information.

4. Optional nitrogen or gas flushing system can be configured to replace air in the package after vacuuming, according to the product's preservation needs.

5. Built-in high-performance vacuum pump ensures strong vacuum levels, stable packaging quality, and long-term reliable operation.

6. Waste film collection system helps maintain a clean and hygienic working environment.

7. Cross-cutting and longitudinal slitting systems support digital adjustments for flexible and precise cutting.

8. Optional add-ons include double-sided forming, liquid filling systems, and fully automatic feeding systems to meet diverse production requirements.

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