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Compression Molding |
Compression molding is a high-volume, high-pressure method of molding used to produce larger flat or moderately curved parts such as hoods, fenders, scoops, spoilers, lift gates and the like for automotive end-uses. Even before plastic existed, this method was widely used in the bakery industry to mold cookies and cakes.
The Process
In this method, the material (which is generally in its granular or putty like form) is first heated and placed in the oven or heated mold cavity. The mold is then closed and subjected to pressure so that the molten material is distributed evenly in the mold cavity. It has to be noted that it is very important to maintain a consistent heat and pressure till the molding materials are cured. The machines used in compression molding are found in a wide range of shapes and sizes. Generally, these presses are powered by a hydraulic ram so that sufficient force is produced.
Raw materials commonly used
- Polyester fiberglass resin systems (SMC/BMC)
- Polyester
- Polyimide (PI)
- Polyamide-imide (PAI)
- Fiber reinforced plastics
- Poly(p-phenylene sulfide) (PPS)
 Different grades of Polyetheretherketone (PEEK). A few important consideration to be kept in mind while executing the process of compression molding
- Determining the proper amount of material.
- Determining the minimum amount of energy required to heat the material.
- Determining the minimum time required to heat the material.
- Determining the appropriate heating technique.
- Predicting the required force, to ensure that shot attains the proper shape.
- Designing the mold for rapid cooling after the material has been compressed into the mold.
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