Importance

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Abstract

In general, the molding of tubular plastic articles such as automotive inlet manifolds with flanges thereon is a difficult and expensive procedure. A simple solution to the problem is the blow molding of the tubular article in a conventional blow molding apparatus followed by the injection molding of the flange around the tubular article in a conventional injection molding apparatus. In the case of an intake manifold, the outlet ends of the manifold pipes are placed in the injection mold, which is closed to define a cavity around the ends of the pipes, and the flange is then molded onto the pipes. Preferably, the ends of the pipes are heated for the injection molding step to ensure good adhesion between the pipes and the flange.

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First Claim