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compression molding 1-9-08 - Compression Molding Douglas J...

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1 Compression Molding Douglas J. Gardner Professor Wood-Polymer Hybrid Composites Introduction to Compression Molding What is compression molding? Typical products Advantages and disadvantages of compression molding Basic factors in compression molding of SMC
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2 What is Compression Molding? Compression molding was specifically developed for replacement of metal components with composite parts. The molding process can be carried out with either thermosets or thermoplastics. However, most applications today use thermoset polymers. In fact, compression molding is the most common method of processing thermosets. Typical Products Automobile parts – Hoods – Roofs – Scoops – Fenders – Spoilers Air deflectors Lift gates Wood composites
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3 Advantages and Disadvantages Advantages: Short cycle time (typically 1-6 minutes) High volume production Class A (high quality) surfaces Disadvantages: High initial capital investment Labor intensive Secondary operations are sometimes required Basic Factors in Compression Molding • Geometry: Wall thickness of part Charge area vs. mold area Charge placement (location) Single or multiple charges • Manufacturing Mold wall heating Closing rate Maximum clamping force Gel time (Mold filling should be complete before the resin gels) De-molding time
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