Plastic bag is made of plastic (commonly used plastics include polypropylene, polyester, nylon, etc.) as the main raw material. They are essential items in people’s daily lives and are often used to hold other items. They are widely used because of their cheapness, extremely light weight, large capacity, and easy storage. However, their production and use are banned in some countries due to their extremely long degradation cycle and difficulty in handling.
Now I will introduce to you the production process of plastic bag
The first step in bag making by plastic food bags manufacturers is film blowing. Film blowing is a plastic processing method that refers to a plastic processing technology that heats and melts plastic particles and then blows them into films. It is the first step in making plastic bags.
If the film is blown out of new particles, it will be bright in color, clean and hygienic, the finished product will stretch well, bear a large weight, and the quality of the plastic bag will be good, so it can be used for food packaging. If plastic particles made from recycled waste plastic are used, color masterbatch is usually added to the raw material particles during film blowing. The resulting film is prone to uneven coloring, brittleness and breakage, and the resulting plastic bag is of poor quality. , lower price. Plastic bags made of this film are unhygienic and should not come into direct contact with food.
The second step is color printing. There are many methods of color printing. Common printing methods include roller printing, gravure printing, and screen printing. Roller printing and gravure printing print the blown plastic film on a whole roll. It is mechanical printing with fast printing speed and suitable for mass production. If screen printing is used, the roll of film is first cut into individual pieces and then manually printed individually. . The printing speed is slow, but the text and pattern of the plastic bags produced in this way have thick ink and a strong three-dimensional effect.
The third step is bag making. Films printed by roller printing or gravure printing are generally ironed and cut into plastic bags using a bag making machine; individual plastic blocks printed by screen printing are ironed manually using tools such as electric soldering irons and heat sealing machines.
The above is the general bag making process of plastic bag manufacturers. You are welcome to come and buy plastic bags.
