Blow Molding Process

In supermarkets, it is increasingly hard to find items packed in glass and jars . A packaging of soft drinks, health care and beauty products, household chemicals and medicines and many other products, have switched from conventional ones to plastics. As the Blow Molding industry has expanded from simple plastic containers to gas tanks, plastic drums, automobile parts and toys in various shapes and sizes.

Blow Molding (BM) process makes it possible to yield molded products economically, in unlimited quantities, with virtually no finishing required. The blow molding process includes a softened thermoplastic tubular form which is inflated against the cooled surface of a sealed mold. The expanded plastic then solidifies into a hollow product.

There are basically four types of blow molding used in the production of plastic jugs, bottles and jars. These four types are:

1) Extrusion blow molding

2) Injection blow molding

3) Stretch blow molding

4) Reheat and blow molding.

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

Injection Blow Molding has very limited and specific applications like making small medicine plastic bottles etc. Extrusion blow molding is the most simple form of blow molding. A tube of plastic material which is generally maintained hot is dropped from an extruder and gets captured in a water cooled mold. Once the molds are sealed, air is injected via the top of the container and the tube is inflated just like a balloon. When the hot plastic material is blown up and touches the walls of the mold the material is then cooled and the container now maintains a solid, rigid shape.

The advantages are many like the tooling costs are very less as compared to injection molding, the part performance is excellent under pressure. The products have awesome environmental stress crack resistance. The products perform great in high-speed impact strength than even the metal components the process can be automatically used in mass production.

The disadvantages mainly increase environmental concerns.

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