What is the blow molding process

Simply put, the blow molding process is a method of producing a plastic hollow product by using gas pressure to inflate a molten plastic parison in a closed mold.


Classification of blow molding processes
Extrusion blow molding, injection blow molding, stretch blow molding


Extrusion blow molding is the extrusion of the parison from the die into the interior of the mold to complete the molding process.


Injection blow molding is to inject the parison into the mold to complete the molding process.


Stretch blow molding is to first form a parison by extrusion or injection molding. After the parison reaches a suitable stretching temperature, it is longitudinally stretched by internal or external mechanical force, and gas is introduced into the interior while stretching. , to complete the production of plastic products.

Here, we take the extrusion blow molding process as an example. blow molding process
Granular plastic raw materials are automatically added into the barrel by the blow molding machine, and
after high temperature heating and screw mixing, the plastic parisons in the molten state are
extruded through the die head, and the mold is closed and the fixture is closed. Clamp
the blowing holes at the bottom of the blow molding machine and blow gas into the parison, so that the parison expands and adheres to the inner wall of the mold to
complete the molding. Enter the cooling stage, the
mold is opened, the product is demolded, and the production is completed.
What raw materials are used in the blow molding process
Almost all thermoplastic materials can be used as raw materials for blow molding, such as high density polyethylene (HDPE), polypropylene (PP) , etc.

These two are recommended for everyone to use, whether it is material properties or other, they are ideal choices. Of course, there are other raw material options available for the blow molding process .


Advantages of the blow molding process
The molding process is fast, the product quality is stable, the production process
is closed, and there will be no pollution .

What products can be produced by blow molding
The blow molding process can produce not only small-capacity plastic bottles of a few milliliters, but also large-capacity plastic buckets and water storage tanks of thousands of liters. In addition to containers, the blow molding process can also produce floats, barricades, pallets, ton barrels, double ring barrels and kayaks, among others. The introduction of the blow molding process is the above content. For more relevant information, please continue to browse on other interfaces of the official website of Yankang. We will continue to update more content.