초록 ▼

An injector for molding machine capable of operation with a simple mold having few cavities at a total cycle of as little as one to five seconds, thereby accomplishing high speed production with a minimum number of mold cavities; the injector having a nozzle structure so arranged as to minimize heat

An injector for molding machine capable of operation with a simple mold having few cavities at a total cycle of as little as one to five seconds, thereby accomplishing high speed production with a minimum number of mold cavities; the injector having a nozzle structure so arranged as to minimize heat transfer to the mold whereby the mold may be maintained at a temperature to effect rapid cooling and ejection of the molded part, while the molding material in the nozzle is maintained in a fluid condition; the rapid cycle of operation serving to maintain the desired nozzle temperature, also.

대표청구항 ▼

A molding machine comprising: a. a mold unit having a mold cavity, means for cooling the mold cavity, an exposed wall surface, and an entrance bore intersecting the exposed wall surface and the mold cavity; b. a heated nozzle structure having a supply bore and an external surface tapering into close

A molding machine comprising: a. a mold unit having a mold cavity, means for cooling the mold cavity, an exposed wall surface, and an entrance bore intersecting the exposed wall surface and the mold cavity; b. a heated nozzle structure having a supply bore and an external surface tapering into close proximity to the periphery of the supply bore to form a nozzle tip of minimum area confronting the exposed wall surface in closely spaced relation thereto, thereby to minimize heat transfer from the nozzle structure to the mold unit and avoid axial compressional load on the nozzle tip; c. the tapered external surface and confronting wall surface diverging radially outward thereby further minimizing heat transfer from the nozzle structure to the mold unit; d. means for supplying molding material in a fluid state to the supply bore for transfer to the mold cavity; e. the extremity of the supply bore forming with the contiguous portion of the wall surface a zone entrapping sufficient molding material to form an internal transistion surface merging into the surface of the entrance bore; f. the closely spaced relation between the wall surface and the nozzle tip permiting limited discharge of molding material between the diverging end surfaces of the nozzle structure and confronting wall surface while maintaining a seal.