What is the production process of self sealing bags

The production process of self sealing bags includes a series of steps, mainly involving plastic processing and bag shaping. The following is a typical process for making self sealing bags:

1. Raw material preparation: Firstly, prepare the plastic raw materials required for making self sealing bags, such as polyethylene (PE) or polypropylene (PP) particles. These raw materials are the basis of self sealing bags, determining the flexibility and transparency of the bags.

2. Extrusion blown film: Heat plastic particles to a molten state and extrude them through an extruder to form a plastic film. This step usually uses blown film technology, which extrudes molten plastic through a circular die and then blows it into a thin film tube through an airflow.

3. Film cooling and winding: The inflated film is cooled by a cooling roller and then wound into a large roll of film material. These film materials will be used for subsequent printing and bag making.

4. Printing (optional): If you need to print patterns or text on a self sealing bag, print on a film. This is usually done using flexographic printing or gravure printing, customizing patterns according to customer needs.

5. Bag making: Feed the film roll into the bag making machine, cut it according to the set size, and add a self sealing strip at the position of the bag mouth. Self sealing strips are used to fix two interlocked plastic strips at the bag opening position through heat sealing technology.

6. Quality inspection: Conduct quality checks on finished products to ensure that the size, sealing performance, and printing quality of the bags meet the requirements.

7. Packaging and Storage: Qualified self sealing bags are sorted, packaged, and then stored or transported to the customer's designated location.

This process combines plastic processing, printing, and heat sealing technology to ensure the production of high-quality self sealing bags that meet various usage needs.