What are the commonly used plastic bag production equipment?

Plastic bags are roughly divided into industrial product packaging bags (including food packaging bags, clothing packaging bags) and shopping bags (supermarket shopping bags, advertising bags, gift bags, the style is not much different, can not distinguish). Plastic bag production equipment includes plate making equipment, blow molding machine (also known as blown film machine), plastic printing machine (variety of gravure printing machine, plate printing machine, roller printing machine, screen printing machine), laminating machine, plastic bag making machine (Generally divided into two types: cutting machine, hot cutting machine).

Plastic bag production equipment

Plastic bag production equipment includes: mixing machine, proofing machine, punching machine, punching machine, baler, if you want to produce recycled plastic bags, you need granulator and pelletizer. Plastic bag production also has some less important equipment, which is rather cumbersome. In the production of plastic bags, it is generally not necessary to launch all of these equipments. It is also common to participate in a link. For example, these industries can be roughly divided into four types: packaging design, blown film, color printing, and bag making.

Plastic bag production process:

The first step of blowing film Blowing film is a plastic processing method, which refers to a plastic processing process of heating and melting plastic particles into a film, which is the first step in the production of plastic bags.

If it is a film blown out with new particles, the color is bright, clean, the finished product is stretched well, the weight is large, and the quality of the plastic bag is good, and it can be used for food packaging. If plastic granules made of recycled waste plastics are used, color masterbatches are usually added to the raw material granules during blown film, and the resulting film is prone to uneven coloration, brittleness and brittleness, and the quality of the produced plastic bags is poor. The price is lower. The plastic bag made of this film is unsanitary and cannot be in direct contact with food.

The "plastic granules" here account for most of the cost of finished plastic bags, and the price of plastic granules fluctuates with the price of oil. In recent years, international crude oil prices have risen all the way, and the production cost of plastic bags has also soared.

The second step of color printing There are many ways of color printing, common printing methods are roller printing, gravure printing, screen printing. Roller printing and gravure printing are full-volume printing of blown plastic film. It is mechanical printing. It has fast printing speed and is suitable for mass production. If screen printing is used, the roll film must be cut into single pieces and then manually print. The printing speed is slow, but the plastic bag text pattern thus produced is thick and has a strong three-dimensional effect.

The color printing here involves a "plate making" problem, each color needs to be a version, each version is a steel drum, and the production of public welfare is also more complicated. Ordinary customers are looking for Xi'an Jiuzhi Industry and Trade to do plastic bags when they can talk about the version of the fee can not be cheaper, we have no way cheap, because the "version fee" is charged by the plate-making company, not that we can decide.

The third step of bag making roller printing, gravure printing film is generally used in the bag making machine to burn, cut into plastic bags; screen printing of a single plastic block must be artificially baked, tools such as electric iron, heat sealing machine.