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**Stretch Film Automatic Vacuum Packaging Machine: A Comprehensive Overview**
The stretch film automatic vacuum packaging machine, also known as the automatic plastic box thermoforming vacuum packaging machine, is a highly efficient and widely used equipment in various industries. It is commonly applied for vacuum or modified atmosphere packaging of frozen meats, seafood such as dried bean curd, dried soy products, drunk fish, octopus, sea cucumbers, chicken feet, chicken wings, roasted sweet potatoes, and other snack foods. In addition, it is also used in the pharmaceutical, medical equipment, electronics, and hardware industries for packaging sensitive and high-value products.
The working principle of this machine involves the use of a forming mold. The process begins by heating the stretch film, which is then shaped using the forming mold to create the desired container structure. Once the film is properly formed, the product is placed into the lower cavity of the formed film, and the vacuum sealing process begins.
The operation process of the stretch film vacuum packaging machine typically includes several key steps:
1. **Vacuuming**: The vacuum chamber is sealed, and the vacuum pump starts operating. As the vacuum level inside the packaging bag reaches the desired degree (controlled by a time relay), the vacuum pump stops. During this phase, a two-position three-way solenoid valve activates, sealing the heat-sealing air chamber and keeping the hot-pressing frame in place.
2. **Heat Sealing**: After the vacuum is completed, the solenoid valve deactivates, allowing atmospheric pressure to enter the heat-sealing air chamber. This creates a pressure difference that causes the chamber to inflate, pushing the upper heat press frame down to seal the package. At the same time, the transformer initiates the heat-sealing process, which is controlled by a time relay and lasts for a few seconds before completion.
3. **Gas Return**: A second two-way solenoid valve is activated, allowing air to re-enter the vacuum chamber. This brings the vacuum pointer back to zero, and the hot-pressing frame resets via a spring mechanism. Finally, the vacuum chamber cover is opened.
4. **Cycle Operation**: The vacuum chamber moves to the next position, entering the next cycle. The left and right chambers work alternately, ensuring continuous and efficient operation.
This advanced packaging technology not only enhances product preservation but also improves production efficiency and reduces labor costs. Whether for food, medical, or industrial applications, the stretch film vacuum packaging machine plays a crucial role in modern packaging solutions. Its reliability, precision, and adaptability make it an essential tool in today's manufacturing environment.