초록 ▼

A generally hollow preform for making a stretch blow-molded container may include a threaded finish portion; a neck portion depending from the finish portion; a transition portion depending from the neck portion; a main portion depending from the transition portion; and a closed, generally rounded t

A generally hollow preform for making a stretch blow-molded container may include a threaded finish portion; a neck portion depending from the finish portion; a transition portion depending from the neck portion; a main portion depending from the transition portion; and a closed, generally rounded tip portion depending from the main portion. The preform may include stretch ratios with respect to the container including an axial stretch ratio of about 3.0 to 3.5, a hoop stretch ratio of about 5.0 to 5.5, and a total stretch ratio of about 15 to 19.25. In some embodiments, high stretch ratios may be achieved with less material, yielding substantial cost savings.

대표청구항 ▼

1. A generally hollow PET preform for making a stretch blow-molded container, comprising: a threaded finish portion;a neck portion depending from said finish portion and including substantially cylindrical walls;wherein said substantially cylindrical walls of said neck portion have a thickness of ab

1. A generally hollow PET preform for making a stretch blow-molded container, comprising: a threaded finish portion;a neck portion depending from said finish portion and including substantially cylindrical walls;wherein said substantially cylindrical walls of said neck portion have a thickness of about 1.73 mm to about 1.67 mm;a transition portion depending from said neck portion and including a first substantially conical wall section having a first taper of wall thickness;a main portion depending from said transition portion and including a second substantially conical wall section having a second taper of wall thickness, the second taper of wall thickness being lesser than said first taper of wall thickness; anda closed, generally rounded tip portion depending from said main portion, said tip portion having a third taper of wall thickness;wherein said tip portion includes walls that taper between a maximum wall thickness and a minimum wall thickness;wherein said maximum wall thickness is about 4.1 mm to about 3.9 mm;wherein said minimum wall thickness is about 2.5 mm to about 2.3 mm;wherein said preform is made of a poly (ethylene terephthalate) resin and has a mass of between about 18.6 grams and about 19.5 grams;wherein said container has a volume of 20 oz+/−5%;wherein said container is configured for use with a carbonated beverage and includes a barrier property for carbon dioxide suitable to allow storage of said carbonated beverage for a period of at least 7 weeks without significant loss of said carbon dioxide;wherein said preform comprises stretch ratios with respect to said container including an axial stretch ratio of about 3.0 to 3.5, a hoop stretch ratio of about 5.0 to 5.5, and a total stretch ratio of about 16 to 18. 2. The preform of claim 1 wherein said first taper of wall thickness includes a percentage taper of between about 54% and about 58%. 3. The preform of claim 1 wherein said second taper of wall thickness includes a percentage taper of between about 2% and about 5%. 4. The preform of claim 1 wherein said third taper of wall thickness includes a percentage taper of between about 38% and about 45%. 5. The preform of claim 1 wherein said preform has a mass of between about 18.6 grams and about 19.0 grams. 6. The preform of claim 1 wherein said total stretch ratio is about 17 to about 18. 7. The preform of claim 1 wherein said main portion is about 2 times the length of said transition portion. 8. The preform of claim 1 wherein said main portion is about 3 times the length of said tip portion. 9. A generally hollow PET preform for making a stretch blow-molded container, comprising: a threaded finish portion;a neck portion depending from said finish portion, said neck portion including substantially cylindrical walls;a transition portion depending from said neck portion, said transition portion including a first substantially conical wall section and having a percentage taper of about 54% to about 58%;a main portion depending from said transition portion, said main portion including a second substantially conical wall section and having a percentage taper of about 2% to about 5%; anda closed, generally rounded tip portion depending from said main portion, said tip portion having a percentage taper of about 38% to about 45%;wherein said preform is made of a poly (ethylene terephthalate) resin and has a mass of between about 18.6 grams and about 19.5 grams;wherein said container has a volume of 20 oz+/−5%;wherein said container is configured for use with a carbonated beverage and has a gas barrier property with an average rate of loss of carbon dioxide of about 7 cc/day;wherein said preform comprises stretch ratios with respect to said container including an axial stretch ratio of about 3 to 3.5, a hoop stretch ratio of about 5 to 5.5, and a total stretch ratio of about 16 to 18. 10. The preform of claim 9 further comprising a first curved wall region, a second curved wall region, and a third curved wall region; wherein said first curved wall region provides a smooth transition between said substantially cylindrical walls of the neck portion and said first substantially conical wall section;wherein said second curved wall region provides a smooth transition between said first substantially conical wall section and said second substantially conical wall section; andwherein said third curved wall region provides a smooth transition between said second substantially conical wall section and said tip portion. 11. The preform of claim 9, wherein said substantially cylindrical walls of said neck portion have a thickness of about 1.73 mm to about 1.67 mm. 12. The preform of claim 9 wherein said tip portion includes walls that taper between a maximum wall thickness and a minimum wall thickness; wherein said maximum wall thickness is about 4.1 mm to about 3.9 mm;wherein said minimum wall thickness is about 2.5 mm to about 2.3 mm. 13. The preform of claim 9 wherein said preform has a mass of between about 18.6 grams and about 19.0 grams. 14. The preform of claim 9 wherein said total stretch ratio is about 17 to about 18. 15. The preform of claim 9 wherein said main portion is about 2 times the length of said transition portion. 16. The preform of claim 9 wherein said main portion is about 3 times the length of said tip portion.