Packaging bags are commonly used in daily life for shopping, groceries, clothing packaging, and waste disposal... Packaging bags have a wide range of uses. However, have you ever wondered how packaging bags are made? What is the printing process for packaging printing? Below, Zhitu Packaging will introduce to you, while also hoping that everyone will cherish the environment and choose high-quality plastic packaging as much as possible. As we all know, plastic packaging bags are made from plastic film. So how is plastic film formed?

Blow molding
Blow molding is the process of using a blow molding machine to blow plastic particles purchased into plastic film.

2. The process of printing plastic packaging bags

The premise of printing plastic packaging bags is that the plastic film and plate are in place. The previous step discussed blow molding. After the film of the order specification is formed, printing should be started. According to the required printing pattern, plate making is generally synchronous with blow molding. After blow molding is completed, the plate is also made. Plate making usually takes about 4 days. Printing is classified as single-sided or double-sided, as well as color differentiation. For example, for supermarket shopping bags, single-sided or double-sided colors are common, with one color corresponding to one plate. However, it is not possible to use the same plate for double-sided colors. For example, if there are two colors on each side, four plates must be made. Plastic bag printing is generally intaglio printing, using mostly copper plates, but also rubber plates. After the printing machine is set up with the plate and the roll, ink is adjusted and printing can begin.

3. Depending on the type of plastic packaging bag, the method of making bags from printed plastic film varies. Some bags need to be folded, some need to be composite, some to be cut, some to be punched... But at this point, the production has basically taken shape.

4. The production process of plastic packaging bags is independent and cannot be guaranteed to be timely, so the production cycle of plastic bags is usually around 10 days.

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