Blow moulding in plastics processing

Blow moulding

For bottles and containers. Reliable conveying, dosing and mixing systems for high-volume production of bottles and other containers.

Process description

Blow moulding is either a continuous or a discontinuous, multi-stage manufacturing process for producing hollow thin walled parts from thermoplastic plastic materials. 

Typical end products

High volume end-consumer products. For example: bottles and containers. It is a part manufacturing process and is not based on lot sizes i.e. weight. 


The two main types are extrusion or injection blow molding. The raw material is fed into a heated barrel, and with screw is mixed and either extruded or injected to form a tube-like piece of plastic called a parison. The parison is then clamped into a mould air is then introduced so blowing the plastic out to match the mold. Once the plastic has cooled and hardened the mould opens and the part is ejected. 

Typical materials being processed

Most raw and compounded polymers in granular form. In addition regrind materials and additives. 

Description of motan system/equipment used

Reliable centralised or stand alone conveying, dosing & mixing systems for high-volume production of bottles and other containers. 

Typical dosing & mixing units

Gain-in-weight blenders (GRAVICOLOR, ULTRABLEND).