Compression Moulding

Compression moulding is a method of molding in which the molding material, generally preheated, is first placed in an open, heated mold cavity.

The mold is closed with a top force or plug member, pressure is applied to force the material into contact with all mold areas, while heat and pressure are maintained until the molding material has cured.

The process employs thermosetting resins in a partially cured stage, either in the form of granules putty-like masses, or preforms. Compression moulding is a high-volume, high-pressure method suitable for molding complex, high-strength fiberglass reinforcements.

Advanced composite thermoplastics can also be compression molded with unidirectional tapes, woven fabrics, randomly oriented fiber mat or chopped strand.

The advantage of compression molding is its ability to mold large, fairly intricate parts. Also, it is one of the lowest cost molding methods compared with other methods such as transfer molding and injection molding.

Compression moulding is a forming process in which a plastic material is placed directly into a heated metal mold, then is softened by the heat, and forced to conform to the shape of the mold as the mold closes.

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