Injection/Blow Molding

"Injection molding is a cyclic process of forming plastic into a desired shape by forcing the material under pressure into a cavity." "Plastic blow molding processes are the most popular methods used to produce hollow products out of thermoplastic materials." PPI has concentrated on automotive components, and medical items. "Injection/Blow molding is the process that combines the separate injection molding and blow molding processes in the same mold assembly to produce an integrated part."

PPI's team are experts in Injection/Blow molding processes, and have been recognized by Industry peers for one of their unique processes (see article in Canadian Plastics, June 2002). This article describes the challenges, described in detail here, of molding a throttle body cuff for an automotive supplier. The part needed a precision cylindrical body that had to flex and the design mandated internal undercuts. A decision was made to manufacture the part in two phases, "Initially we going to try to do it by straight injection" said Andy Rolph President of PPI. "It looked prohibitively expensive, though, to engineer all the undercuts for the fingers, and so we decided we'd look at it as a straight sided part with injection molding and then blow molding it to create the bellows before the part had set." Another creative solution to an engineering problem!

PPI's combined experience of over 200 man-years shows: prototypes or long or short production runs on new and well maintained computer controlled machines, PPI consistently turns out precision parts.


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