What is the most common type of blow molding process?

What is the most common type of blow molding process?

Extrusion Blow Molding
Extrusion Blow Molding Perhaps the most common type of blow molding process is extrusion. With extrusion blow molding, plastic is heated until it turns from a solid state to a liquid state. The liquefied plastic is then forced into an extrusion machine.

What are the different types of moulding?

There are 5 types of plastic moulding that is considered to be the most effective and most popular. These 5 types are extrusion moulding, compression moulding, blow moulding, injection moulding and rotational moulding.

What is the blow molding process?

Blow molding is the forming of a hollow object by inflating or blowing a thermoplastic molten tube called a “parison” in the shape of a mold cavity. The process consists of extruding or “dropping” a parison on which female mold halves are closed. The female mold halves contain the shape of the product to be produced.

What is extrusion blow Moulding?

Extrusion Blow Molding is the simplest type of blow molding. A hot tube of plastic material, called a parison, is dropped from an extruder and captured in a water cooled mold. Once the molds are closed, air is injected through the top or the neck of the container; just as if one were blowing up a balloon.

What kind of plastic is used in blow molding?

Extrusion type blow molding processes. In the extrusion type blow molding process, the parison is obtained with extrusion of plastic from tube die. When the required length parison is extruded, two-part mold is closed, and the upper side of the parison is squeezed to close by mold halves.

What’s the difference between blow molding and injection molded?

The air pressure then pushes the plastic out to match the mold. Once the plastic has cooled and hardened the mold opens up and the part is ejected. The cost of blow molded parts is higher than that of injection-molded parts but lower than rotational molded parts. The process principle comes from the idea of glassblowing.

How is blow molding used in the glass industry?

Blow molding is actually used in the glass industry to produce different types of glass containers. But also, blow molding processes are used for thermoplastic materials to produce different types of containers, bottles, drums, etc. For plastic blow molding processes, the production rate is very high.

How are hollow shaped parts produced in blow molding?

And with the application of blow inside this piece of material, which is also called a parison, hollow shaped parts in a specific size is produced. The swelling of the parison is controlled by special molds.