Importance

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Abstract

A molding apparatus and method, such as slush or rotational molding, for forming a thermoplastic shell product. The mold assembly includes a hollow mold box provided with a metal mold shell thereon, which box and shell cooperate to define a hollow chamber which extends longitudinally of the box and is defined adjacent the back surface of the mold shell. Heated air is supplied into one end and discharged from the other end of the chamber to effect heating of the metal shell. The chamber contains a plurality of flow control devices disposed at spaced intervals within and along the chamber. The flow control devices are individually adjustable and programmable so as to divert the heated air from conventional longitudinal flow into transverse flow either toward or away from the back surface of the mold shell.

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First Claim