Heated nozzle bushing with fixed spiral blade

Details Heated nozzle bushing with fixed spiral blade Heated nozzle bushing with fixed spiral blade

B - Operations, Transporting

29

C

18/702

B29C 45/30 (2006.01)

Patent

CA 1165525

ABSTRACT OF THE DISCLOSURE This invention relates to a nozzle bushing for a sprue gated injection molding system. The elongated nozzle bushing has a hollow stainless steel inner core portion through which extends the runner passage from the molding machine to the cavity gate and around which is located a helical electric heating element. A highly conductive copper portion is cast over the heating element and the inner core portion, and covered by a stainless steel outer sleeve. A steel spiral blade member is fixed in the runner passage to impart a curving or swirling motion to the melt as it flows from the gate into the cavity. This provides the advantage of improving product strength by reducing unidirectional molecular orientation of the melt, as well as reducing stringing of the melt when the mold opens to eject the product.

370734

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