Plastics Processes: Compression Moulding (DMC)

Compression moulding process used to mould Dough Moulding Compound (DMC)

Materials used for compression moulding are either in the form of a dough-like substance or in sheet form.  Both forms are composed of resin, chopped glass fibres, a catalyst and a release agent. 

The dough like substance is called Dough Moulding Compound (DMC). 

A measured amount of Dough Moulding Compound (DMC) is placed into the heated female mould, (the yoke). The heated male side of the mould (the plug) closes forcing the Dough Moulding Compound into the mould cavities. 

The heat from the mould cures and hardens the compound. When the DMC has cured and hardened sufficiently, the plastic moulded product is ejected from the mould.

Click on the link to view an animation of the compression moulding process using Sheet Moulding Compound (SMC).

Learn about Plastics

Multimedia Design and Technology Education uses animations and supporting technology notes to teach about plastics and plastics processes.

Animations describe plastics processes in probably the most clear way possible, making plastics processes easy to understand, learn and remember.

All the plastics processing technology notes and animations can be found in the plastics section of our Key Stage 3 Design and technology software and in the Plastics Notes and Animations software package.

Click on a link below to view animations of plastics processes.

• Line Bending
• Expanded Polystyrene
• Injection Moulding
• Extrusion Blow Moulding
• Blown Film
• GRP
• Resin Transfer
• Pultrusion Process
• Moulding SMC

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Together, the KS3 Design and Technology and our original KS4 Design and Resistant Materials Technology software make a very useful and economical D&T teaching and learning package, giving students and teachers D&T information, exercises and tests.

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