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Rotational Molding Process
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Rotational molding is a cost-effective method to produce large
plastic parts. Resins are added into a mold that’s heated and
rotated slowly, both vertically and the horizontally. This simultaneous
heating and rotation distributes and fuses the resin on the inner
surfaces of the mold. Rotational molding produces seamless parts
with uniform wall thickness and more material in corners, to absorb
shocks and stresses where they occur most.
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The four-phase Rotomolding process:
- Loading - Pre-measured plastic resin is loaded into the
mold (Polyethylene¹s and plastisols) are the most common materials
- Heating - the molds are placed into an oven, and slowly
rotated on two axes. The heat penetrates the molds, melting resin
adheres to the mold’s inner surface until it’s fused
and evenly coats the entire surface
- Cooling - during this phase, the mold continues to be
rotated to maintain even walls as air, water spray, or a combination
of the two gradually cools the mold
- Unloading - the mold is opened, the finished part removed,
and the mold is ready for its next cycle
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