![]() Profiles cooling channels facilitate efficient heat transfer from the preform spherical radius and gate area to minimize crystallinity. One-piece cavities eliminate parting line coolant leaks, eliminate nozzle gate inserts, and allow for water cooling channels to be profiles to the shape of the preform. This alignment ensures concentric material distribution from the nozzle into the injection cavity resulting in less leverage on the cores during injection therefore, more accurate control of preform wall thickness variation. Preform mold cavities, nozzle housings and nozzles are also located by the same jig-ground bore diameters in the mold bases. To achieve concentricity between core and cavity mold halves, final mold base bore diameters are jig-ground.
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