초록 ▼

A method and apparatus for injection blow molding hollow plastic articles characterized by increased capacity due to back-to-back operations or stack molding and a rapid and efficient operating cycle. The process and apparatus includes back-to-back injection mold stations, back-to-back blow mold sta

A method and apparatus for injection blow molding hollow plastic articles characterized by increased capacity due to back-to-back operations or stack molding and a rapid and efficient operating cycle. The process and apparatus includes back-to-back injection mold stations, back-to-back blow mold stations located on each side of and adjacent said injection mold stations in side-by-side relationship therewith, back-to-back ejection stations located adjacent each of said blow mold stations in side-by-side relationship, and blow cores cooperating with said injection stations and blow stations, wherein the operation of said cores is facilitated by an overlapping cycle.

대표청구항 ▼

Process for injection blow molding hollow plastic articles which comprises providing back-to-back first and second injection molds each including a respective first and second mold cavity formed by a respective first and second mold wall, each of said cavities cooperating with a respective first and

Process for injection blow molding hollow plastic articles which comprises providing back-to-back first and second injection molds each including a respective first and second mold cavity formed by a respective first and second mold wall, each of said cavities cooperating with a respective first and second core, back-to-back first and second blow molds each adjacent respective first and second mold cavities in side-by-side relationship therewith, back-to-back first and second ejection stations in side-by-side relationship with said respective first and second blow molds, and first and second ejection mandrels adjacent respective first and second cores, and engageable with said first and second ejection stations, respectively, wherein said cores, mandrels, blow molds and ejection stations comprise a first set and a second set, respectively, and including the step of providing a third and fourth set of cores, mandrels, blow molds and ejection stations adjacent and in line with the first and second set, respectively, with said blow molds and ejection stations being in back-to-back relationship with each other and on opposite sides of said first and second injection molds, injecting molten plastic into said mold cavities to form first and second parisons on said cores, moving said parisons on said cores into said blow molds, expanding said parisons on said cores in said blow molds to form hollow articles, transferring said hollow articles to said ejection stations from said blow molds on said ejection mandrels and removing said hollow articles from said ejection stations, wherein said first and second cores and said first and second mandrels operate in overlapping cycles whereby said first core and first mandrel are located at said first injection mold and first blow mold, respectively, while said second core and second mandrel are located at a position spaced from said second injection mold and second blow mold, respectively and whereby said first core and first mandrel are located at said first blow mold and first ejection station, respectively, while said second core and second mandrel are located at a position spaced from said second blow mold and second ejection station, respectively, and said third and fourth sets are simultaneously in corresponding positions, including the step of providing a common platen for said first and third cores and a common platen for said second and fourth cores, with a balanced motive means for both platens and moving said common platens via said balanced motive means. An apparatus for injection blow molding hollow plastic articles which comprises back-to-back first and second injection molds each including a mold wall, opposing first and second cores each engageable with a respective injection mold to form a mold cavity with its respective mold wall, means to inject molten plastic into said mold cavities to form parisons therein, back-to-back first and second blow molds adjacent respective injection mold cavities in side-by-side relationship therewith, back-to-back first and second ejection stations adjacent respective blow molds in side-by-side relationship therewith, first and second ejection mandrels in side-by-side relationship with said first and second cores engageable with said first and second ejection stations, respectively, wherein said cores, mandrels, blow molds and ejection stations comprise a first and second set, respectively, and a third and fourth set of cores, mandrels, blow molds and ejection stations adjacent and in line with the first and second set, respectively, with said blow molds and ejection stations being in back-to-back relationship with each other and on opposite sides of said first and second injection molds, means to move said parisons from said first and second injection molds to said first and second blow molds and means to expand said parisons in said blow molds to form hollow articles therein, means to move said hollow articles on said ejection cores from said blow molds to said ejection stations for removal therefrom, and means to locate said first and second cores in overlapping cycles wherein said first core and first mandrel are located at said first injection mold and first blow mold, respectively, while said second core and second mandrel are located at a position spaced from said second injection mold and second blow mold, respectively, and wherein said first core and first mandrel are located at said first blow mold and first ejection station, respectively, while said second core and second mandrel are located at a position spaced from said second blow mold and second ejection station, respectively, and wherein said third and fourth sets are simultaneously in corresponding positions, including a common platen for said first and third cores and a common platen for said second and fourth cores, with a balanced motive means for both platens.