Stack injection molding melt transfer apparatus

Details Stack injection molding melt transfer apparatus Stack injection molding melt transfer apparatus

1989-11-01

1991-05-07

Heitbrink, Timothy

Plastic article or earthenware shaping or treating: apparatus

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

With means between charger and mold to cut off flow of...

137861, 137869, 2642972, 2643288, 425570, 425572, 425588, B29C 4522

Patent

active

050132350

ABSTRACT:
A stack molding apparatus wherein the injection nozzles are disposed in pairs of coaxial nozzles in a housing between two sets of injection molds. The reciprocable valving elements of the injection nozzles of each pair are coaxial with each other and are connected with pistons which are reciprocable by compressed air. The pistons are mounted in cylinders of discrete melt supplying members which receive melt from an additional melt supplying member. The housing has two mirror symmetrical sections which can be parted in a plane between pairs of coaxial pistons to afford access to the melt supplying members, to the pistons, to the nozzles and to a device which serves to supply compressed air for reciprocation of the pistons. The melt supplying members have melt conveying channels which register with each other in assembled condition of the housing sections, and the air supplying device has passages which can admit air directly between pairs of coaxial pistons or into the cylinders of the melt supplying members which carry the pistons and the associated nozzles.

REFERENCES:
patent: 3037245 (1962-06-01), Darnell
patent: 4212626 (1980-07-01), Gellert
patent: 4662837 (1987-05-01), Anderson
patent: 4832593 (1989-05-01), Brown

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