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Understanding the Process:
In compression molding, a premeasured amount of molding material or “charge” is placed in the open mold cavity. The top portion of the mold is lowered by a hydraulic ram and pressure is applied to distribute the molding material which is held under pressure until the part is cured. The mold is then opened and the part is removed.
Applications well suited for Compression Molding include those requiring a combination of physical properties in the final part. Compression Molding fills a small but important niche where both thermoset and thermoplastic resins and compounds may be needed.
Pro’s
- Low equipment costs
- Low to moderate mold costs
- Broad range of reinforcement options
- Low molded in stress
- Wall thickness variation
- Short lead time
Con’s
- Limited part geometry
- Lower tolerances
- Longer cycle times
- Higher material and part cost
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