What is a blow molding machine

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Blow molding machine is a kind of equipment that makes plastic pellets into hollow containers through blow molding process. At present, the more common models include hollow extrusion blowing machines that use PP and PE for one molding, and PET, PC or PP for two moldings. The injection stretch blow molding machine, as well as the newly developed multi-layer hollow extrusion blow molding and stretch blow molding.


Blow molding machines are basically divided into two categories: one-step blow molding machines and two-step blow molding machines.

One-step blow molding machine : plastic raw materials - drying - plasticizing - tube blank injection molding - temperature adjustment - stretch blow molding - demolding - inspection - finished product. The above processes are completed on the same equipment, the equipment is compact, the degree of automation is high, the product quality is stable, and the efficiency is high, but the investment in equipment and molds is large...

Two-step blow molding machine:

The first step: plastic raw material - drying - plasticizing - tube blank - injection molding - inspection - tube blank (semi-finished product);

The second step: preheating the tube blank - stretch blow molding - inspection - finished product.

The drying of the raw materials in the first step is carried out in drying equipment such as a drying oven, and the molding of the tube blank is completed by an injection molding machine. The second step of preheating the tube blank can be done in a honeycomb oven or a far-infrared rotary heater. Stretch blow molding can be done by hand picking and placing bottles with a semi-automatic blow molding machine, or with an automatic blow molding machine.

The equipment for producing plastic bottles by the two-step method, such as drying equipment, injection molding machines, blow molding machines, etc., can be produced in China, and the technology is relatively mature. The molds can also meet the requirements of product quality. The domestic models of automatic PE blow molding machines can replace imports. equipment.

Among them, the two-step blow molding machine is divided into a linear blow molding machine and a rotary blow molding machine (some small blow molding machines and semi-automatic machines are not statistically classified for the time being).

Two-step blow molding machines are widely used in the following industries:

Production of medium or high temperature filling PET bottles for beverage applications;

Fully automatic PET/PP large-mouth container production for food industry applications

Production of high temperature sterilized OPP bottles for dairy beverage applications;

Production of OPP infusion and flushing liquid bottles for pharmaceutical applications.