Injection blow molding process and apparatus
AssigneeCanada Cup, Inc.
InventorsTommy Thomas, John W. West
Life of this patent
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Abstract
A method and apparatus for injection blow molding hollow plastic articles characterized by a rapid and efficient operating cycle. The injection mold includes a mold cavity and the blow mold is located adjacent the mold cavity in side-by-side relationship. The parison is injection molded into the mold cavity onto a core. The parison on the core is separated from the mold cavity by moving the parison on the core axially in a straight path away from the mold cavity, followed by movement in a substantially arcuate path into axial alignment with the blow mold, followed by axial movement in a straight path into said blow mold.
Claims21
A process for injection blow molding hollow plastic articles which comprises:
- providing an injection mold including a mold cavity formed by a mold wall and a core;
- injecting molten plastic into said cavity to form a parison on said core;
- separating said parison from said mold wall by moving said parison on said core axially in a straight path away from said mold wall;
- providing a blow mold adjacent said mold cavity in side-by-side relationship therewith;
- moving said parison on said core in a substantially arcuate path into axial alignment with said blow mold;
- moving said parison on said core axially in a straight path into said blow mold;
- expanding said parison on said core in said blow mold to form said hollow article;
- separating said core from said hollow article in said blow mold and leaving said hollow article in said blow mold by moving said core axially in a straight path away from said blow mold, followed by moving said core in a substantially arcuate path into axial alignment with said mold wall and moving said core axially on a straight path into said mold wall for repeat of the cycle;
- providing a plane defined by the axes of the injection mold cavity and of said blow mold, wherein said arcuate path is coplanar with said plane and includes an arcuate section in which a change of velocity of said core takes place and a linear section of constant velocity.
Apparatus for injection blow molding hollow plastic articles which comprises:
- an injection mold including a mold wall;
- a core engageable with said injection mold to form a mold cavity with said mold wall;
- means to inject molten plastic into said mold cavity to form a parison therein;
- a blow mold adjacent said mold cavity in side-by-side relationship therewith;
- means to separate said parison from said mold wall operative to move said parison on said core axially in a straight path away from said mold wall followed by movement in a substantially arcuate path into axial alignment with said blow mold, followed by axial movement in a straight path into said blow mold;
- and means to expand said parison on said core in said blow mold to form said hollow article;
- means for separating said core from said hollow article in aid blow mold and leaving said hollow article in said blow mold by moving said core axially in a straight path away from said blow mold, followed by moving said core in a substantially arcuate path into axial alignment with said mold wall and moving said core axially on a straight path into said mold wall for repeat of the cycle;
- the axes of the injection mold and of the blow mold defining a plane that is coplanar with the plane of said arcuate path including an arcuate section during which a change of velocity of said core takes place and a linear section of constant velocity.
Dependencies are inferred from the claim text.