Synthetic resin biaxial oriented blow formed preform for forming bottle body

1. An extrusion blow molded synthetic resin preform for molding a bottle by a biaxially stretching and blow molding means, said preform comprising a mouth portion, a cylindrical barrel portion from which the barrel is molded, a bulging shoulder portion to be molded into the shoulder, said portion existing between the mouth portion and the cylindrical barrel portion and having a diameter that widens slightly in the downward direction; a bottom shell portion for molding the bottom, which has been blow molded from the corresponding bottom portion of a parison so as to have a widened and deformed shape, an inner overhang wall portion in any position starting from the opposite side of the neck ring, which is disposed circumferentially around the lower part of the mouth portion, and ending at the upper portion of the bulging shoulder portion, with said inner wall portion having a diameter that widens in the downward direction; and the wall of the preform in certain laminated structures.

2. The preform according to Claim 1 for molding a bottle by a biaxially stretching and blow molding means, wherein the bottom shell portion, from which the bottom is molded, has an almost spherical shape.

3. An extrusion blow molded synthetic resin preform for molding a bottle by a biaxially stretching and blow molding means, said preform comprising a mouth portion, a cylindrical barrel portion from which the barrel is molded, a bulging shoulder portion to be molded into the shoulder, said portion existing between the mouth portion and the cylindrical barrel portion and having a diameter that widens slightly in the downward direction, a bottom shell portion for molding the bottom, said bottom shell portion having been blow molded from the corresponding bottom portion of a parison so as to have a widened and deformed shape, a radially widened connecting portion connecting the lower part of the cylindrical barrel portion with the bottom shell portion, with the radially widened connecting portion having a larger diameter than the barrel portion, and the wall of the preform in certain laminated structures.

4. The preform according to Claim 3 for molding a bottle by a biaxially stretching and blow molding means, wherein the bottom shell portion, from which the bottom is molded, has an almost spherical shape and wherein the radially widened connecting portion is provided by widening the diameter downward at the lower part of the cylindrical barrel portion where this portion is connected to the bottom shell portion.

5. The preform according to Claim 3 or Claim 4, for molding a bottle by a biaxially stretching and blow molding means, wherein the preform comprises an inner overhang wall portion in any position starting from the opposite side of the neck ring, which is disposed circumferentially around the lower part of the mouth portion, and ending at the upper portion of the bulging shoulder portion, with said inner wall portion having a diameter that widens in the downward direction.

6. The preform according to any one of Claims 1 to 5, for molding a bottle by a biaxially stretching and blow molding means, wherein at least one of the bulging shoulder portion, the cylindrical barrel portion, and the bottom shell portion has a reduced shape similar to the shoulder, the barrel, or the bottom of the bottle.

7. The preform according to any one of Claims 1 to 6, for molding a bottle by a biaxially stretching and blow molding means, wherein a reinforcing rib is projected from under the downside of the pinch-off portion in the bottom shell portion.

8. The preform according to any one of Claims 1 to 7, for molding a bottle by a biaxially stretching and blow molding means, wherein the preform has the laminated wall structure consisting of at least the polyethylene terephthalate resin layer and the polyethylene naphthalate resin layer.

9. The preform according to any one of Claims 1 to 7, for molding a bottle by a biaxially stretching and blow molding means, wherein the preform has the laminated wall structure consisting of at least the outer and inner layers of polyethylene terephthalate and the middle layer of a gas barrier resin.

10. The preform according to any one of Claims 1 to 7, for molding a bottle by a biaxially stretching and blow molding means, wherein the preform has the laminated wall structure comprising at least the outer layer of polyethylene or polypropylene and the inner layer of an ethylene vinyl alcohol copolymer or the polyethylene terephthalate resin.

1 1. The preform according to any one of Claims 1 to 7, for molding a bottle by a biaxially stretching and blow molding means, wherein the preform has the laminated wall structure consisting of at least the outer layer of polyethylene or polypropylene, the middle layer of a gas barrier resin, and the inner layer of polyethylene or polypropylene.

12. The preform according to any one of Claims 1 to 7, for molding a bottle by a biaxially stretching and blow molding means, wherein the preform has the laminated wall structure consisting of at least the outer layer of nylon and the inner layer of polypropylene or polyethylene.

13. The preform according to any one of Claims 1 to 7, for molding a bottle by a biaxially stretching and blow molding means, wherein the preform has the laminated wall structure consisting of at least the outer and inner layers of a virgin resin material and the middle layer of a regenerated resin material.

14. The preform according to any one of Claims 1 to 7, for molding a bottle by a biaxially stretching and blow molding means, wherein the outer layer of the laminated wall contains an antistatic additive.

15. The preform according to any one of Claims 1 to 7, for molding a bottle by a biaxially stretching and blow molding means, wherein the outer layer of the laminated wall contains a UV-absorbing agent.

16. The preform according to any one of Claims 1 to 7, for molding a bottle by a biaxially stretching and blow molding means, wherein the preform has the laminated wall structure consisting of at least the outer layer of a synthetic resin and the inner layer of another synthetic resin having low compatibility with the synthetic resin used in the outer layer.

17. The preform according to Claim 16, for molding a bottle by a biaxially stretching and blow molding means, wherein the preform has the laminated wall structure consisting of the above-described outer and inner layers and the bottom adhesive layer to adhere these layers over the entire length of the pinch-off portion, which is formed when the portion of a parison corresponding to the bottom shell portion is forced to flatten by the pinch-off section of the split blow mold.

18. The preform according to Claim 16 or Claim 17, for molding a bottle by a biaxially stretching and blow molding means, wherein the preform has the laminated wall structure consisting of the outer layer and the inner layer and also comprising at least an adhesive layer of a vertical slip to adhere these layers over the entire height of the preform.

19. An extrusion blow molded synthetic resin preform for molding a bottle by a biaxially stretching and blow molding means, said preform comprising a mouth portion; a cylindrical barrel portion from which the barrel is molded; a bulging shoulder portion to be molded into the shoulder, said portion existing between the mouth portion and the cylindrical barrel portion and having a diameter that widens slightly in the downward direction; a bottom shell portion of a roughly spherical shape, from which the bottom is molded; and an inner overhang wall portion in any position starting from the opposite side of the neck ring, which is disposed circumferentially around the lower part of the mouth portion, and ending at the upper portion of the bulging shoulder portion, with said inner wall portion having a diameter that widens in the downward direction.

20. An extrusion blow molded synthetic resin preform for molding a bottle by a biaxially stretching and blow molding means, said preform comprising a mouth portion; a cylindrical barrel portion from which the barrel is molded; a bulging shoulder portion to be molded into the shoulder, said portion existing between the mouth portion and the cylindrical barrel portion and having a diameter that widens slightly in the downward direction; a bottom shell portion of a roughly spherical shape, from which the bottom is molded; and a radially widened connecting portion connecting the lower part of the cylindrical barrel portion with the bottom bulb portion, with said connecting portion of an arced shape having a larger diameter than the barrel portion.

21. The preform according to Claim 20, for molding a bottle by a biaxially stretching and blow molding means, wherein the preform comprises an inner overhang wall portion in any position starting from the opposite side of the neck ring, which is disposed circumferentially around the lower part of the mouth portion, and ending at the upper portion of the bulging shoulder portion, with said inner wall portion having a diameter that widens in the downward direction.

22. The preform according to any one of Claims 19, 20, or 21, for molding a bottle by a biaxially stretching and blow molding means, wherein a reinforcing rib is projected from under the downside of the pinch-off portion in the bottom shell portion.

23. An extrusion blow molded synthetic resin preform for molding a bottle by a biaxially stretching and blow molding means, substantially as hereinbefore described with reference to the accompanying drawings.

Dated 17 July, 2006 Yoshino Kogyosho Co. Ltd Patent Attorneys for the Applicant/Nominated Person SPRUSON & FERGUSON