Cold sprue injection molding device with integral sprue chamber and injection nozzle

Abstract

Abstract There is provided a cold sprue injection molding device with a sprue chamber integral with the nozzle, together with suitable temperature controlling means, such as a liquid jacket, to maintain temperature in the sprue chamber sufficiently low so that with a thermosetting resin, the resin does not cure before injection at the parting line of a two-part split mold. Specifically, the device comprises a ram-type injection feeder means and means for maintaining a predetermined temperature in said feed means, said device being in contact with a split mold with means for maintaining molding temperatures therein. More specifically, the device comprises a plasticizing and sprue chamber and an injection nozzle as a single unit positioned to direct molding composition feed through the nozzle terminating at the parting line of a sprue chamber-free split mold, said sprue chamber-injection nozzle unit being positioned independent of the mold and being detachably removable therefrom, wherein the tip of the nozzle of said unit terminates at the parting line of the split mold; means for maintaining non-curing molding temperatures in said plasticizing and sprue chamber-injection nozzle unit, said means extending to a point from about one-eighth inch to one-half inch from the nozzle tip; and a split mold in which one of the two sections thereof contains partially positioned therein the said detachably removable sprue chamber-injection nozzle unit, said mold having means therein for maintaining curing temperatures for the molding composition.

Inventors

• 👤 J Yago
• 👤 R Haas
• 👤 G Rheinfrank

Bibliographic Details