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**Stretch Film Automatic Vacuum Packaging Machine: An 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 system in various industries. It is commonly applied in the food sector for frozen meat, dried tofu, soy-based products, seafood such as drunk fish, octopus, sea cucumbers, chicken feet, chicken wings, and roasted sweet potatoes. Additionally, it is utilized in pharmaceuticals, medical equipment, electronic components, and industrial tools for vacuum or modified atmosphere packaging.
This type of packaging machine operates using a forming mold. The process begins by heating the stretch film, which is then shaped into a container form using the mold. Once formed, the product is placed into the lower cavity of the film, and the vacuum sealing process starts.
The operation of the stretch film vacuum packaging machine involves several key steps:
1. **Vacuuming**: The vacuum chamber is sealed, and the vacuum pump activates to remove air from both the packaging bag and the chamber. The vacuum level is controlled by a time relay (ISJ) until it reaches the desired level. At this point, the vacuum pump stops, and the solenoid valve (IDT) seals the heat-sealing chamber, keeping the hot press frame in place.
2. **Heat Sealing**: After the vacuum is complete, the IDT valve deactivates, allowing atmospheric pressure to enter the heat-sealing chamber. This pressure difference causes the chamber to inflate, pushing the upper heat press frame down to seal the bag's opening. Simultaneously, the transformer initiates the sealing process, and the time relay (2SJ) controls the duration of the sealing.
3. **Gas Return**: The two-way solenoid valve (2DT) opens, allowing air to re-enter the vacuum chamber. This action brings the vacuum pointer back to zero, and the hot press frame resets via a spring mechanism. The vacuum chamber cover is then opened.
4. **Cycle**: The vacuum chamber moves to the next position, initiating the next cycle. The left and right chambers operate alternately, ensuring continuous and efficient production.
This machine is an essential tool in modern packaging lines, offering high precision, speed, and reliability. Its ability to create airtight and protective environments makes it ideal for preserving product quality and extending shelf life across multiple industries. Whether for food, medicine, or electronics, the stretch film vacuum packaging machine plays a crucial role in maintaining product integrity and safety.