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Rotational Molding
In the rotational molding process, a predetermined amount of powdered resin is placed in a hollow mold. The mold is then transferred to an oven or heated chamber where it is rotated biaxially. As the powder tumbles against the heated walls of the mold it begins to melt and stick. Once fully cured the mold is transferred to cooling station where it is allowed to cool while continuing to rotate. Once cool, the mold is opened and the part is removed.
Rotational molding is often a cost effective process alternative when hollow and/or highly durable parts are required. The ability to vary material, part weight/wall thickness and even color from part to part provides unique flexibility when required.
Pro’s
- Moderate to very large parts
- Low individual mold cost
- Lower equipment costs
- Low molded in stresses
Con’s
- Very long cycle times
- Higher part cost
- Labor intensive
- Lower tolerances
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