The history of rotational molding began somewhere between 1940 and 1950 in the USA when the process was developed for a small number of plastics. By the late 1950s, when the rotational molding process was better understood, applications for other industries were developed including road cones, marine buoys, and car armrests. A process was developed in Europe in the early 1960s that enabled large hollow containers to be created in low density polyethylene (LDPE) by rotating (or rocking) a mold on a chassis, houses open gas jets, through 30 degrees which coated the inside of the mould with the polymer…
The history of plastic injection molding has seen steady industry growth since its beginnings in the late 1800s. The technique has evolved from the production of combs and buttons to major consumer, industrial, medical, and aerospace products. In 1868, John Wesley Hyatt invented a way to make billiard balls by injecting celluloid into a mould.From Website
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