Injection molding manifold system having balanced bridging manif

Details Injection molding manifold system having balanced bridging manif Injection molding manifold system having balanced bridging manif

1987-04-21

1988-08-02

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means to heat or cool

2643288, 26432814, 425549, 425570, 425571, 425588, B29C 4522

Patent

active

047613432

ABSTRACT:
This invention relates to an improved manifold system for a multi-cavity injection molding system. The manifold system has one elongated bridging manifold which extends transversely across a number of spaced elongated support manifolds. Each of the support manifolds, in turn, extend across a number of heated probes or nozzles, each of which leads to a gate to a cavity. The bridging manifold has a portion of the hot runner passage extending through it from a single inlet to receive melt from the molding machine to a number of spaced outlets. Each of the support manifolds also has an inlet which is in alignment with one of the outlets from the bridging manifold and a number of spaced outlets. Each of the outlets of the support manifolds is in alignment with an inlet to one of the probes or nozzles. Each of the manifold has two way junctions at which a larger diameter portion of the hot runner passage joins two smaller diameter downstream portions. In the bridging manifold, the hot runner passage extends along the same plane as the inlet and outlets, whereas in the support manifold the portion connecting the junctions extends in a transverse plane. Forming the manifold system of separate composite plate bridging and support manifolds with different melt passage orientations improves streamlined and uniform flow and reduces pressure drop while allowing flexibility of system design for different applications.

REFERENCES:
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patent: 3951375 (1976-04-01), Lovell
patent: 4212626 (1980-07-01), Gellert
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patent: 4333629 (1982-06-01), Roy
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patent: 4576567 (1986-03-01), Gellert
patent: 4620958 (1986-11-01), Wiechard
Ewikon Brochure 01799 entitled, "Heisskanalsystem".
Plastics Mold Engineering Handbook, Van Nostrand Reinhold Company, 3rd Ed. 1978, pp. 197,360,362-364.

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