Working Principle Of Producing Plastic Packaging Bags - plastic bag,trash bag,garbage bag - WX Pack
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Working Principle Of Producing Plastic Packaging Bags

Raw material preparation

Raw materials: mainly plastic particles such as polyethylene (PE) and polypropylene (PP).

Additives: such as antioxidants, stabilizers, colorants, etc., added as needed.


Extrusion molding

Extruder: The plastic particles are melted into a molten state by heating, and then extruded and molded through the screw of the extruder.

Blowing film: The molten plastic is extruded into a film through the die head, and it is blown into a film tube by blowing.

Cooling and shaping: The blown film is cooled by the cooling ring to form a preliminary film shape.

Tractive winding: The cooled film is pulled to the winder by the traction roller and wound into a roll to form a preliminary plastic film roll.

Printing: If you need to print patterns or texts, you can print on a special printing press, usually using flexographic printing or gravure printing.


Bag making

Cutting: Cut the film roll according to the required size.

Edge sealing: The edge of the bag is sealed by heat sealing or ultrasonic sealing technology.

Punching: If you need a handle or hanging hole, you can punch it in this step.


Quality inspection and packaging

Quality inspection: Check the quality of the finished plastic bags, including size, printing effect, sealing firmness, etc.

Packaging: Qualified plastic bags are stacked and packaged for easy transportation and sales.

Each step has corresponding equipment and process parameters, which need to be strictly controlled to ensure the quality of the final product. The whole process involves knowledge and technology in multiple fields such as machinery, chemicals, and printing.