초록 ▼

A plurality of injection cores are inserted by a movable platen into corresponding injection cavities defined by mold inserts within a stationary platen, and the cores extend through corresponding split transfer mold cavities. After hollow preforms with threaded neck portions are molded within the c

A plurality of injection cores are inserted by a movable platen into corresponding injection cavities defined by mold inserts within a stationary platen, and the cores extend through corresponding split transfer mold cavities. After hollow preforms with threaded neck portions are molded within the cavities, the preforms are removed from the mold cavities, separated from the injection cores, and then shifted transversely by the split transfer molds to cooling or blow cavities defined by blow cavity inserts within the stationary platen on opposite sides of the corresponding injection cavities. The transfer molds return to receive the injection cores, and corresponding blow core units are inserted into the preforms within the blow cavities for pressurizing and expanding the preforms into firm contact with the blow inserts. The preforms are removed from the blow cavities by the blow cores in alternate cycles of press operation and are then released by retraction of the blow cores. The split transfer molds are shifted transversely in opposite directions and are opened and closed by a cam system which includes cam tracks mounted on the movable platen and incorporating cam track switches.

대표청구항 ▼

A method of efficiently producing hollow articles having open end portions, comprising the steps of inserting a plurality of injection cores into corresponding injection cavities within a mold assembly and through corresponding transfer molds defining cavity extensions, injecting a molten plastics m

A method of efficiently producing hollow articles having open end portions, comprising the steps of inserting a plurality of injection cores into corresponding injection cavities within a mold assembly and through corresponding transfer molds defining cavity extensions, injecting a molten plastics material into the injection cavities and cavity extensions and around the injection cores to form a corresponding plurality of hollow articles having open end portions, retracting the injection cores and the transfer molds from the injection cavities to remove the articles from the injection cavities, removing the injection cores from the articles while retaining the open end portions of the articles with the transfer molds, shifting the transfer molds and articles laterally without shifting the injection cores, inserting the articles with the transfer molds into corresponding blow cavities defined by walls within the mold assembly releasing the articles from the transfer molds and returning the transfer molds into alignment with the corresponding injection cavities while the articles are held in the blow cavities, inserting a corresponding plurality of blow cores into the articles within the blow cavities, internally pressurizing the articles within the blow cavities with the blow cores to expand the articles into firm contact with the walls defining the blow cavities while another plurality of articles are molded within the injection cavities, removing the expanded articles from the blow cavities with the blow cores and the other plurality of articles from the injection cavities with the injection cores retracting the blow cores from the expanded articles removed from the blow cavities to release the expanded articles for removal from the mold assembly, retracting the injection cores from the other plurality of articles, and repeating the above steps.