Processing Method

ROTOMOLDING

Rotational molding (rotomolding) is a very popular process and is widely used to obtain usually hollow products. It is used for the manufacturing of small quantities of very large products. Products that can be manufactured by this process include toys, balls and garden furniture

Rotomolding uses plastisol (a somewhat viscous paste obtained by dispersion of PVC in plasticizer) in a very fluid state. It is introduced in the mould. The mould is closed, put in an oven and turned vertically and horizontally. The mould, that is kept spinning, distributes nearly melting plastisol over its walls by centrifugation, forming a film. After a determined period of time, the mould is taken out of the oven and carefully cooled to prevent shrinkage or torsion.

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