초록 ▼

An extrusion blow molded container is provided comprising a closed base, a body portion extending from the closed base having a surface finish that is substantially free of striations, and an open neck portion extending from the body portion. In an embodiment, the container is comprised of polyethyl

An extrusion blow molded container is provided comprising a closed base, a body portion extending from the closed base having a surface finish that is substantially free of striations, and an open neck portion extending from the body portion. In an embodiment, the container is comprised of polyethylene terephthalate (PET); the base portion includes a support portion and a substantially elevated portion having a center and a major diameter; and the center is disposed an elevated distance above said surface that is less than about 0.05 the major diameter. A method and apparatus for extrusion blow molding an article is also disclosed.

대표청구항 ▼

1. A method for extrusion blow molding a polyethylene terephthalate container, the method comprising: providing a mold set configured to form a container having a base for supporting the container upon a surface, the base including a support portion and a substantially flat elevated portion having a

1. A method for extrusion blow molding a polyethylene terephthalate container, the method comprising: providing a mold set configured to form a container having a base for supporting the container upon a surface, the base including a support portion and a substantially flat elevated portion having a center and a major diameter; a body portion extending from the base; and an open neck portion extending from the body portion; the mold set including a plurality of pinch-offs, each pinch-off with a raised pinch, wherein the raised pinches are provided at different positions around the mold;providing an extruder including a die head, the die head including a head tooling coating;extruding a hollow tube comprised of polyethylene terephthalate;closing the mold set about the hollow tube; andinjecting a gas into the hollow tube to form the container;wherein the center of the elevated portion is disposed at an elevated distance above said surface, the elevated distance being less than about 0.05 times the major diameter. 2. The method as recited in claim 1, wherein the elevated portion of the base is non-circular. 3. The method as recited in claim 1, wherein the body portion is substantially free of striations. 4. The method as recited in claim 1, wherein the mold set includes a surface having a fine-glass-bead finish. 5. The method as recited in claim 1, wherein the hollow tube is comprised of commercial-grade polyethylene terephthalate. 6. The method as recited in claim 1, wherein the tube includes recycled polyethylene terephthalate. 7. The method as recited in claim 1, wherein the polyethylene terephthalate has an intrinsic viscosity greater than about 0.96. 8. The method as recited in claim 1, wherein the mold set includes two mold halves, each mold half including a pinch-off with a raised pinch. 9. The method as recited in claim 8, wherein the pinch-off is comprised of a metal. 10. The method as recited in claim 9, wherein the pinch-off is comprised of stainless steel. 11. The method as recited in claim 1, wherein each pinch-off includes a cavity portion. 12. The method as recited in claim 1, wherein the raised pinch of the at least one pinch-off extends substantially flat and parallel along a length at a distance of about 0.003 inches.+−.0.0005 inches above a parting line. 13. The method as recited in claim 8, the container including a handle and the mold set including raised pinches at least at the handle eye, tail flash, and outer side of the handle positions. 14. The method as recited in claim 1, including the step of spin-trimming the open neck of the container. 15. The method as recited in claim 1, wherein a surface of the mold set is mechanically blasted with a material. 16. The method as recited in claim 15, wherein one or more portions of the mold surface are selectively blasted to produce a smooth, light glass bead finish. 17. The method as recited in claim 15, wherein one or more corners of the mold surface is/are selectively blasted to produce a smooth, light glass bead finish. 18. The method as recited in claim 15, wherein the material is a fine glass bead polished to a 600 radial wipe. 19. The method as recited in claim 1, wherein the mold is configured to produce a container having a closed base with a substantially flat elevated portion. 20. The method as recited in claim 1, wherein the container has a body portion with a substantially clear surface finish. 21. The method as recited in claim 1, including the step of heat setting the container. 22. The method as recited in claim 1, wherein the die head tooling coating includes a metallic coating. 23. The method as recited in claim 22, wherein the metallic coating is a two-coat metallic coating. 24. The method as recited in claim 1, wherein the die head tooling coating includes a polymer plastic coating. 25. The method as recited in claim 1, wherein said at least one pinch-off of the plurality of pinch-offs includes one or more compression segments. 26. The method as recited in claim 25 further comprising a transition segment between the one or more compression segments and the at least one pinch-off. 27. The method as recited in claim 26, wherein the transition segment is an angled segment relative a flat of the at least one pinch-off and a flat of at least one compression land. 28. The method as recited in claim 27, wherein the angle of the angled segment relative the flat of the at least one pinch-off and the flat of the at least one compression land is approximately 45 degrees. 29. The method as recited in claim 1, wherein a neck portion of the mold includes a stainless steel insert. 30. The method as recited in claim 1, including the step of forming vent openings at one or more locations on the container produced. 31. A method for extrusion blow molding a container comprised of polyethylene terephthalate, comprising: providing a mold set configured to form a container having a base for supporting the container upon a surface, the base including a support portion and a substantially flat elevated portion having a center and a major diameter; a body portion extending from the base; and an open neck portion extending from the body portion; the mold set including a plurality of pinch-offs, each pinch-off with a raised pinch, wherein at least one raised pinch extends substantially flat and parallel along a length at a distance above a parting line;providing an extruder including a die head, the die head including a head tooling coating;extruding a hollow tube comprised of polyethylene terephthalate;closing the mold set about the hollow tube; andinjecting a gas into the hollow tube to form the container;wherein the center of the elevated portion is disposed at an elevated distance above said surface, the elevated distance being less than about 0.05 times the major diameter, and the body portion is substantially free of striations. 32. The method as recited in claim 31, wherein the elevated portion of the base is non-circular. 33. The method as recited in claim 31, wherein the mold set includes a surface having a fine-glass-bead finish. 34. The method as recited in claim 31, including the step of spin-trimming the open neck of the container. 35. The method as recited in claim 31, including the step of heat setting the container. 36. The method as recited in claim 31, including the step of forming vent openings at one or more locations on the container produced.