A system and method for hydraulic blow molding a plastic preform into a container. The system includes a nozzle having a nozzle body with a main bore extending therethrough and an outlet for ejecting molding medium into a preform positioned within a mold. A minimum internal diameter is defined withi
A system and method for hydraulic blow molding a plastic preform into a container. The system includes a nozzle having a nozzle body with a main bore extending therethrough and an outlet for ejecting molding medium into a preform positioned within a mold. A minimum internal diameter is defined within the body of the preform, which is bound on opposing ends between an open end and a closed end. To form the container, a liquid stream is injected into the preform. The liquid stream is defined by the outlet so as to have an external diameter that is less than the minimum inner diameter of the preform, allowing the stream to impinge upon the close end of the preform without impinging upon a transition of the preform, where the minimum inner diameter of the preform is reduced from the diameter of the finish.
대표청구항▼
1. A method of forming a container from a preform made of plastic, the method comprising the steps of: positioning a preform within a mold having interior surfaces defining a cavity in the shape of the container, the preform having a body bounded by a closed end and an open end, the body defining a
1. A method of forming a container from a preform made of plastic, the method comprising the steps of: positioning a preform within a mold having interior surfaces defining a cavity in the shape of the container, the preform having a body bounded by a closed end and an open end, the body defining a preform minimum diameter;injecting a molding medium into the preform, the molding medium being a liquid;axially stretching the preform within the mold;radially expanding the preform into conformity with the interior surfaces of the cavity defining the shape of the container, radial expansion being effectuated by the injected molding medium;the injecting step further including the steps of forming the molding medium into a stream having an outer diameter that is less than the minimum diameter of the preform, and directing the stream downward into the preform to initially only impinge upon the preform at the closed end and to initially avoid impingement upon the preform in areas of the preform other than the closed end. 2. The method of claim 1, wherein the preform includes a transition extending between a finish and a body of the preform, the transition reducing in diameter from the finish to the body of the preform, the step of injecting the molding medium further including the step of forming the stream and injecting the stream such that the stream does not impinge upon the transition. 3. The method of claim 2, wherein the step of injecting the molding medium further including the step of forming the stream and injecting the stream such that the stream does not impinge upon the body of the preform. 4. A method of forming a container from a preform made of plastic, the method comprising the steps of: positioning a preform within a mold having interior surfaces defining a cavity in the shape of the container, the preform having a body bounded by a closed end and an open end, the body defining a preform minimum diameter;injecting a molding medium into the preform axially stretching the preform within the mold;radially expanding the preform into conformity with the interior surfaces of the cavity defining the shape of the container, radial expansion being effectuated by the injected molding medium;the injecting step further including the steps of forming the molding medium into a stream having an outer diameter that is less than the minimum diameter of the preform, and directing the stream into the preform to initially impinge upon the preform at the closed end and to initially avoid impingement upon the preform in areas of the preform other than the closed end; andwherein the step of axially stretching the preform includes moving a stretch rod to an extended position where the stretch rod is extended within and contacts the preform. 5. The method of claim 4, wherein the step of injecting liquid occurs while the stretch rod is extended within the preform. 6. A method of forming a container from a preform made of plastic, the method comprising the steps of; positioning a preform within a mold having interior surfaces defining a cavity in the shape of the container, the preform having a body bounded by a closed end and an open end, the body defining a preform minimum diameter;injecting a molding medium into the preform axially stretching the preform within the mold;radially expanding the preform into conformity with the interior surfaces of the cavity defining the shape of the container, radial expansion being effectuated by the injected molding medium;the injecting step further including the steps of forming the molding medium into a stream having an outer diameter that is less than the minimum diameter of the preform, and directing the stream into the preform to initially impinge upon the preform at the closed end and to initially avoid impingement upon the preform in areas of the preform other than the closed end; andwherein the step of injecting liquid occurs after the step of axially stretching the preform. 7. The method of claim 1, wherein the step of axially stretching the preform includes axially stretching the preform as a result of a force exerted on the preform by the molding medium being injected into the preform. 8. The method of claim 1, wherein the step of injecting the molding medium includes the step of forming the stream with a diameter of at least 2 mm less than the minimum diameter of the body of the preform. 9. The method of claim 1, further comprising the steps of extending a centering rod into the cavity, engaging an exterior surface of the closed end of the preform with the centering rod, and retracting the centering rod during axial stretching of the preform. 10. A molding system for hydraulic blow molding a preform made of plastic into a container, the molding system comprising: a mold having interior surfaces defining a mold cavity in the shape of the container, the mold being configured to receive a preform therein, the preform having a body extending between a closed end and an open end, the body defining a minimum inner diameter of the preform;a nozzle having a main bore extending therethrough, the nozzle body including an inlet into the main bore and an outlet from the main bore, the outlet defining an outlet diameter;a seal pin moveable with respect to the nozzle between a closed position and the open position, in the closed position the seal pin closing off the outlet from the main bore and in the open position the seal pin not closing off the outlet;a source of molding medium, wherein the molding medium is a liquid that is to be retained in the container, the source being the coupled to the nozzle; andthe outlet diameter being less than the minimum internal diameter of the preform whereby during molding the molding medium is injected as a stream into the preform from the outlet such that the stream does not impinge the body of the preform. 11. The system of claim 10, wherein the body of the preform includes a transition extending from the open end toward the closed end, the transition reducing in diameter as it progress from the finish toward the closed end. 12. The system of claim 11, wherein the outlet diameter is at least 2 mm less than the minimum inner diameter of the preform. 13. The system of claim 10, further comprising a stretch rod, the stretch rod being located in a central bore of the seal pin and being moveable between a retracted position and an extended position, in the extended position the stretch rod extending into the preform. 14. The system of claim 13, wherein the stretch rod extends centrally through the outlet. 15. The system of claim 13, further comprising a centering rod, the centering rod being moveable between a retracted position and an extended position, in the extended position the centering rod contacting the closed end of the preform on an exterior surface thereof. 16. The system of claim 10, further comprising a centering rod, the centering rod being moveable between a retracted position and an extended position, in the extended position the centering rod contacting the closed end of the preform on an exterior surface thereof and during axial stretching of the preform. 17. The system of claim 10, the outlet includes a terminal portion defining a spray angle. 18. The system of claim 17, wherein the spray angle is defined relative to a central longitudinal axis extending through the outlet and is in the range of 0° to 5°. 19. The system of claim 17, wherein the spray angle is defined relative to a central longitudinal axis extending through the outlet and is about 0°. 20. The system of claim 10, wherein the minimum inner diameter of the preform is defined by a transition of the preform.
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이 특허에 인용된 특허 (3)
Hirota, Norihisa; Watanabe, Kazunobu; Asano, Yutaka; Nagao, Jotaro, Method of feeding composite molten resin and apparatus for feeding the same.
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