What is the production process of plastic packaging bags?

Plastic packaging bags are a common packaging material widely used in modern life. It is mainly made of plastic raw materials and processed through a series of production processes. Plastic packaging bag manufacturers will introduce the production process of plastic packaging bags in detail below.

Preliminary: Raw material preparation

The main raw material of plastic packaging bags is plastic particles, usually polyethylene (PE), polypropylene (PP), etc. These raw materials need to be cleaned and screened before production to remove impurities and unqualified particles to ensure product quality.

Step Two: Plastic Melting

After the raw materials are cleaned and screened, they are heated and melted through special plastic melting equipment. After the plastic particles are heated to a certain temperature, they are melted into plastic liquid through the action of the spiral stirrer.

Step 3: Extrusion molding

The molten liquid of plastic is extruded through the extrusion machine and passes through the die. The die is a metal mold with a specific shape that is used to squeeze plastic liquid into a long film tube with air.

Step 4: Cooling and Stretching

The extruded film tube is cooled to solidify quickly and stretched through a stretching machine to the required thickness and width. Stretching can improve the transparency and strength of the plastic film and make it more uniform.