초록 ▼

Apparatus for tri-injecting a plurality of thermoplastic materials to mold an article having a layered wall structure using thermoplastic materials having different optimum processing temperatures including the maintenance of the optimum temperatures in flow paths individual to each material from it

Apparatus for tri-injecting a plurality of thermoplastic materials to mold an article having a layered wall structure using thermoplastic materials having different optimum processing temperatures including the maintenance of the optimum temperatures in flow paths individual to each material from its source at least to the injection nozzle.

대표청구항 ▼

A tri-injection molding apparatus for molding articles and preforms having multi-layered walls comprising: at least one mold cavity, said cavity having a nozzle individual thereto, a hot runner system including conduit means for supplying at least three thermoplastic materials to said mold cavity, e

A tri-injection molding apparatus for molding articles and preforms having multi-layered walls comprising: at least one mold cavity, said cavity having a nozzle individual thereto, a hot runner system including conduit means for supplying at least three thermoplastic materials to said mold cavity, each material originating from a separate source, in which the conduit means defines separate and individual channels for each thermoplastic material from said source through separate nozzle channels to said mold cavity, heating means associated with the apparatus for maintaining at least two of said materials at their appropriate temperature from its source through the hot runner system and through the separate nozzle channels to the mating mold cavity, insulating means in said nozzle separating at least two of said nozzle channels, said insulating means being substantially co-extensive with said nozzle and being operative to block heat transfer from one nozzle channel to the other, and heating means associated with the apparatus for maintaining the third of said materials at the appropriate process temperature from its source to the nozzle.