The plastic resin pellets are melted and two sets of molds are needed to form the part. First, plastic is injected into the preform mold which injection molds a contoured pre-form. The pre-form is then transferred on the core rod and inserted into a blow mold cavity and inflated. (Stretch blow molding uses the same procedures as injection blow molding, but prior to inflation, a stretch rod enters the preform and stretches it at the same time the compressed air blows the plastic to the sidewalls.) The mold opens and a fully-formed part is removed from the core rod. There is no flash in the IBM or SMB process.
A two-stage process of plastic bottle manufacturing where a preform or parison is injection molded. The bottle finish is formed at this time. The preform is then transferred to a blow mold where the bottle takes its final shape.
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