rotational molding

American  

noun

1. a method for molding hollow plastic objects by placing finely divided particles in a hollow mold that is rotated about two axes, exposing it to heat and then to cold.

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Example Sentences

These plastic forms, like those in children’s playground equipment and durable toys, are produced by a 1960s process called rotational molding: Resins are entered into a heated mold that rotates slowly on the vertical and the horizontal.

From Los Angeles Times

The designer and the manufacturer discussed the cost advantages of making the base using rotational molding and whether Magis could guarantee the plastic would be distortion-free when it cooled.

From New York Times