The process of making plastic bags

What is the process of making plastic bags?

Simply put, plastic bags are formed from granular raw materials through a film blowing machine into film materials, and then printed and then bagged.

The general flow chart is as follows: 

plastic particles→plastic film→printed plastic film→finished bag

What are plastic pellets? How did it become a plastic film?

Plastic pellets are by-products of petroleum refining. They are usually polymer materials. The most commonly used ones are PE polyethylene and PP polypropylene.

How did the plastic pellets become plastic films?

First, the plastic particles and some plastic additives are uniformly mixed and then added to the film-blowing machine. The film-blowing machine melts the plastic particles into a liquid state and then extrudes it through an extruder, and then the liquid plastic is cooled and awakened by a blower. The pinch rod squeezes the air out of the cylinder to make a barrel-shaped plastic film.

How are plastic bags printed? How is the bag made?

Some people may mistakenly think that plastic bags are made into bags first and then printed, but this is not the case. The plastic bag is made by printing the plastic film first and then carrying out the bag-making process.

So how are plastic bags printed?

The printing machine attaches the ink through the small pits on the plate roller and then prints it on the plastic film. It is quickly dried by the air duct of the oven so that the ink will not fade. The adhesion of the ink also depends on the film-blowing process. Layer electrons, if there are not enough electrons, it may fade.

After the plastic film is printed, it can be used to make bags on the bag-making machine. The bag-making machine cuts the plastic film into plastic packaging bags one by one through a punching machine, a hot cutting knife, or a cold cutting knife.