Plastics Process Selection - Process Features

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Process selection is extremely important with plastics processing. Generally the features of the desired article or product define the process and the process then starts to define the materials that can be used. The elimination of some materials from the possible range starts the materials selection process.

Consult a plastics technologist when in doubt!

Process

Feature

Extrusion

 

Injection Moulding

 

Blow Moulding

 

Rotational Moulding

 

Thermo-forming

 

Equipment Cost

High

High

High

Moderate

Moderate

Tooling Cost

Moderate

High

Moderate

Low

Low

Cycle Time

Continuous

<1 min

<1 min

>3 min

1-3 min

Economic Quantity

>5Km

>10K

>10K

100 - 10K

100 - 10K

Precision

Good

Good

Moderate

Moderate

Low

Wall Thickness Control

Yes

Yes

No

No

No

Open-ended Hollows

No

Yes

Yes

Yes

Yes

Enclosed Hollows

No

No

Yes

Yes

No

Very Small Items

No

Yes

No

No

No

Complicated / Intricate Shapes

Yes

Yes

Yes

No

No

Large Enclosed Volumes

No

No

Yes

Yes

No

Inserts

No

Yes

No

Yes

No

Moulded-in Holes

No

Yes

No

No

No

Threads

No

Yes

Yes

No

No

 

Last edited: 11/03/10

  Tangram Technology Ltd. 1998

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