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When it comes to manufacturing large hollow plastic parts, nothing beats the process of rotomolding. Compared to other molding or casting processes like injection or blow molding, rotomolding is exceptionally cost efficient and the products produced are also of better quality.
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  Home > Different Industrial Molding Processes > Blow Molding

Blow Molding Process

Blow Molding Machine What is Blow Molding?

Blow molding also known as blow foaming, is a standard molding process for manufacturing of big hollow plastic parts such as fuel tanks, beverage bottles, etc. The concept of this process originated from the idea of glass blowing technique. First verified people to use blow molding process were- Enoch Ferngren and William Kopitke. In the blow molding process plastic polymers are melted in order to form a parison, a plastic tube like structure with a hole at one end so that compressed air can pass through it. Blow molding is also known as injection blow moulding, plastic blow moulding, extrusion blow moulding, automatic blow moulding, roto blow moulding, plastic extrusion blow moulding, bottle blow moulding, etc.

Understanding Blow Molding Process

This process is quiet similar to injection moulding & extrusion. Firstly, the plastic is fed into a hopper in granular form. The role of a motor is to turn a large thread and feed the granules through a heated section. At the third stage, the granules melt in the heated section and take a form of liquid that is fed into a mould. Afterwards, air is forced into the mould so that the plastic can take desired shape. Lastly, the mould is cooled and removed.

Different Types of Blow Molding Process

There are three kinds of Blow Molding Process – Extrusion Blow Molding, Injection Blow Molding & Stretch Blow Molding:

1. Extrusion Blow Molding: In this process, plastic resin is heated up till it melts and is extruded into tubular shape called ‘Parison’. The parison is trapped inside 2 halves of the required mould & air is forced into the mould to get desired shape product. The extrusion molding process is extensively used for manufacturing shampoo bottles, dairy containers, hoses/ pipes, and hollow industrial parts.

Further, there are 2 types of extrusion blow molding:

a. Continuous Extrusion Blow Molding:

b. Intermittent Extrusion Blow Moulding:

Which is further divided into the straight intermittent process and the accumulator process:

2. Injection Blow Molding: There are three stages in the injection blow molding process; injection, blowing and ejection. First, the material/ polymer is injected so as to form a preform & then it is blown to the desired shape. This process is mainly used for developing medical bottles.

3. Stretch Blow Molding: Stretch blow molding is extensively used to produce bottles, jars and other containers. In this process infrared heaters are used to heat the Blow Molding Machinepreforms above their glass transition temperature after which high air pressure is employed to blow them into bottles.

Advantages of Blow Molding
  • Low die cost
  • Rapid production rate
  • Low tool Cost
  • Produces recyclable parts
  • Ability to mold complex plastic products
Buying Blow Molding Machines and Equipments

In this competitive market, there are different types of blow molding machines available. You can source the blow molding machinery as per your specifications from certified manufacturers, exporters and suppliers based in different parts of India.

Contact us for details of manufacturers, suppliers and exporters all kinds of blow molding machine, injection blow molding machine, plastic blow molding machine, extrusion blow molding machine, automatic blow molding machine, roto blow molding machine, plastic extrusion blow molding machine, bottle blow molding machine from India. You can send your query regarding blow molding process or any types of blow molding machines and equipments.
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