A method and apparatus for blow molding an article wherein a parison is positioned between substantially opposed mold closures. The opposed mold closures and at least one other mold closure are advanced, wherein the at least one other mold closure is advanced into abutment with at least one of anoth
A method and apparatus for blow molding an article wherein a parison is positioned between substantially opposed mold closures. The opposed mold closures and at least one other mold closure are advanced, wherein the at least one other mold closure is advanced into abutment with at least one of another of the substantially opposed mold closures, and another of the at least one other mold closure. Thereafter, a gas may be injected within the interior of the parison to form a molded article, the mold closures retracted along their respective axes, and the molded article removed.
대표청구항▼
1. A method of blow molding an article from a parison in a cavity of a blow mold comprising the steps of: providing a first pair of mold closures, each having a mold cavity surface and movable in the direction of a first axis between open and closed positions;providing a second pair of mold closures
1. A method of blow molding an article from a parison in a cavity of a blow mold comprising the steps of: providing a first pair of mold closures, each having a mold cavity surface and movable in the direction of a first axis between open and closed positions;providing a second pair of mold closures, each separate from the first pair of mold closures, each having an abutment surface and a separate mold cavity surface, and each being carried by the same one closure of the first pair of mold closures;providing a third pair of mold closures, each separate from both the first pair and the second pair of mold closures, each having an abutment surface constructed for engagement with the abutment surface of a respective one of the mold closures of the second pair of mold closures, each having a separate mold cavity surface, and each being carried by the same other closure of the first pair of mold closures;positioning a molten plastic parison with a plurality of layers including a fuel vapor barrier layer between the first, second, and third pairs of mold closures before the mold is closed;advancing the first pair of mold closures in the direction of the first axis to close the first pair of mold closures without pinching the parison and prior to blow molding the parison;advancing the second pair of mold closures and the third pair of mold closures into engagement of the abutment surfaces of the second pair of mold closures with the abutment surfaces of the third pair of mold closures without pinching the parison; andadvancing relative to the first pair of mold closures the second pair of mold closures in the direction of a second axis and the third pair of mold closures in the direction of a third axis parallel to the second axis in order to close the blow mold and position their mold cavity surfaces to form a closed mold cavity,wherein the mold is closed without the abutment surfaces engaging the parison and without pinching the parison between any of the entirety of the abutment surfaces as a result of closing the blow mold and before blow molding the parison in the closed mold cavity so that the parison is blow molded in the closed mold cavity without forming any heavy flash and without rupturing the fuel vapor barrier layer,wherein the first, second, and third axes are separate from one another, andwherein the first axis is perpendicular to the second and third axes. 2. The method of claim 1 further comprising the step of providing a carrier assembly within an interior of said parison. 3. The method of claim 2 further comprising the steps of: mounting said carrier assembly to a blow pin; andextending said blow pin with said carrier assembly mounted thereto into the interior of said parison. 4. The method of claim 3 further comprising the step of injecting a pressurized gas within the interior of said parison to expand said parison outwardly within said mold closures. 5. The method of claim 1 wherein both the second and third pairs of mold closures are closed before blowing the parison into engagement with the second and third pairs of mold closures to produce a blow molded article without pinching the parison along any of at least three parting lines resulting from interfaces of said mold closures extending along the article on each of opposite sides of the article. 6. The method of claim 1 further comprising the step of providing a carrier assembly within an interior of the parison before blow molding the parison into engagement with the closed mold closures. 7. The method of claim 1 further comprising the steps of: mounting a carrier assembly to a blow pin; andextending the blow pin with the carrier assembly mounted thereto into the interior of the parison before blow molding the parison into engagement with the closed mold closures. 8. The method of claim 6 further comprising the steps of: injecting a pressurized gas within the interior of the parison;retracting the first pair of mold closures along the first axis; andremoving a molded article formed from the parison. 9. The method of claim 8 further comprising the steps of advancing the first pair of mold closures in the direction of said first axis transverse to said second and third axes into abutment with each other and to engage the abutment surfaces of the second pair of mold closures with the abutment surfaces of the third pair of mold closures before blowing the parison into engagement with the mold closures to produce a blow molded article without pinching the parison along any of at least three parting lines resulting from interfaces of said mold closures and extending along the article on each of opposite sides of the article. 10. A method of blow molding comprising the steps of: providing left and right side mold segments movable in the direction of a first axis;providing left and right rear mold segments, each having a mold surface and a separate abutment surface, and each respectively slidably carried by the left and right side mold segments;providing left and right front mold segments, each having a mold surface and a separate abutment surface, and each respectively slidably carried by the left and right side mold segments;positioning a molten plastic parison with a plurality of layers including a fuel vapor barrier layer between the left and right side, rear, and front mold segments before the mold is closed;advancing the left side mold segment and the right side mold segment toward each other in the direction of the first axis to engage the side mold segments without pinching the parison between the side mold segments;advancing the abutment surfaces of the front and rear left mold segments into engagement with the respective abutment surfaces of the front and rear right mold segments without pinching the parison by the abutment surfaces of these front and rear mold segments;advancing the rear left mold segment toward the front left mold segment in the direction of a second axis substantially perpendicular to the first axis;advancing the rear right mold segment toward the front right mold segment in the direction of a third axis separate from and substantially parallel to the second axis and substantially perpendicular to the first axis in order to form a closed mold, wherein the parison is not pinched between any of the entirety of the mold segments as a result of closing the mold;injecting a pressurized gas into the interior of the parison after closing the mold so that the parison is blow molded in the closed mold cavity without forming any heavy flash, without pinching the parison between any of the entirety of the mold segments, and without rupturing the fuel vapor barrier layer;retracting the side mold segments in the direction of the first axis; andremoving the molded article formed from the parison. 11. The method of claim 10 further comprising the step of providing a carrier assembly within an interior of said parison. 12. The method of claim 11 further comprising the steps of: mounting said carrier assembly to a blow pin; andextending said blow pin with said carrier assembly mounted thereto into the interior of said parison. 13. The method of claim 10 further comprising the steps of advancing said side mold segments along said first axis into abutment with each other and to engage the abutment surfaces of the left rear and front mold segments with the right rear and front mold segments respectively before blowing the parison into engagement with the mold segments to produce a blow molded article without pinching the parison along any of at least three parting lines extending along the molded article on each of opposite sides of the molded article and resulting from interfaces of said mold segments. 14. The method of claim 10 further comprising the step of: providing a pressurized gas into said parison to expand said parison into engagement with said mold segments in order to form a blow molded article, wherein said parison undergoes a stretch ratio of about one-to-one to form a narrower portion of said blow molded article and another stretch ratio of about two-to-one to form a larger flange portion of said blow molded article. 15. A method of blow molding an article from a parison having a vapor barrier layer within a cavity of a blow mold, said method comprising the steps of: providing a first pair of opposed mold closures each having a mold surface, a second pair of mold closures each having a mold surface and a separate abutment surface and each carried by the same one mold closure of said first pair of mold closures, and a third pair of mold closures each having a mold surface and a separate abutment surface and each carried by the same other mold closure of said first pair of mold closures, wherein said third pair of mold closures is substantially opposed to said second pair of mold closures;positioning said parison between said first pair of mold closures before the mold is closed;advancing said first pair of mold closures substantially toward one another along a first axis in a first axial direction; andadvancing at least one of said second or third pairs of mold closures relative to the other of said second or third pairs of mold closures independently of advancing the first pair of mold closures toward one another,wherein the abutment surfaces of the second pair of mold closures are engaged with the abutment surfaces of the third pair of mold closures as a result of closing the mold and without any of the abutment surfaces engaging the parison,wherein the parison is not pinched between any of the entirety of the abutment surfaces as a result of closing the mold and before blow molding the parison in the closed mold cavity,wherein the parison is blow molded in the closed mold cavity without forming any heavy flash and in order to form an article therefrom,wherein said advancing step further includes advancing one of said second pair of mold closures substantially toward one of said third pair of mold closures along a second axis that is substantially parallel to said first axis and advancing the other of said second pair of mold closures substantially toward the other of said third pair of mold closures along a third axis that is substantially parallel to said first and second axes, andwherein the first, second, and third axes are separate from one another. 16. The method of claim 15 wherein said advancing step includes advancing the abutment surfaces of said second pair of mold closures substantially into engagement with the abutment surfaces of said third pair of mold closures substantially in the first axial direction. 17. The method of claim 15 further comprising the steps of: injecting a pressurized gas into the interior of said parison;retracting said first, second, and third pairs of mold closures; andremoving said article formed from said parison. 18. The method of claim 17 further comprising the step of providing a carrier assembly within the interior of said parison. 19. The method of claim 18 further comprising the steps of: mounting said carrier assembly to a blow pin; andextending said blow pin with said carrier assembly mounted thereto into the interior of said parison. 20. The method of claim 15 further comprising the step of: providing a pressurized gas into said parison to expand said parison into engagement with said mold closures in order to form a blow molded article, wherein said parison undergoes a stretch ratio of about one-to-one to form a narrower portion of said blow molded article and another stretch ratio of about two-to-one to form a larger flange portion of said blow molded article. 21. The method of claim 15 further comprising the steps of advancing said first pair of mold closures in said first axial direction into abutment with each other and to engage the abutment surfaces of the second pair of mold closures with the abutment surfaces of the third pair of mold closures before blowing the parison into engagement with the mold closures to produce a blow molded article without pinching the parison along any of at least three parting lines extending along the article on each of opposite sides of the article and resulting from interfaces of said mold closures. 22. The method of claim 15 further comprising the steps of advancing said first pair of mold closures in said first axial direction into abutment with each other and to engage the abutment surfaces of the second pair of mold closures with the abutment surfaces of the third pair of mold closures before blowing the parison into engagement with the mold closures to produce a blow molded fuel tank without pinching the parison along any of at least three parting lines extending along the fuel tank on each of opposite sides of the fuel tank and resulting from interfaces of said mold closures. 23. The method of claim 15 wherein the second and third pairs of mold closures are advanced into engagement of their respective abutment surfaces with one another and subsequently the first pair of mold closures is advanced toward one another. 24. The method of claim 15 further comprising the steps of advancing the second and third pairs of mold closures into engagement of their respective abutment surfaces with each other before blowing the parison into engagement with the mold closures to produce a blow molded article without pinching the parison along any of at least three parting lines extending along the article on each of opposite sides of the article and resulting from interfaces of said mold closures.
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이 특허에 인용된 특허 (13)
Lee Norman C. (Greensboro NC), Apparatus for blow molding an article with compression molded areas.
Linss Gerhard (Weissenburg DEX) Ossberger Karl (Weissenburg DEX), Apparatus for manufacturing a blown synthetic hollow body with a closed bottom portion.
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