초록 ▼

This relates to the packaging of a hot liquid product in a container having little resistance to internal vacuum wherein immediately after the container has been filled, the container is internally pressurized and closed. This particularly relates to an injection molded preform formed of a suitable

This relates to the packaging of a hot liquid product in a container having little resistance to internal vacuum wherein immediately after the container has been filled, the container is internally pressurized and closed. This particularly relates to an injection molded preform formed of a suitable polyester resin which is of a configuration related to an intended blow mold cavity whereby the desired biaxial orientation is obtained in the various portions of the resultant container and the wall thickness of the container base is increased so as to prevent undue stress enlargement and creep at high internal pressurization. Internal pressurization on the order of 40-45 psig is envisioned.

대표청구항 ▼

[ We claim:] [1.] An intermediate product comprising:an expanded biaxially-oriented polyester preform container, the contains including a neck finish, a body portion and a base portion;the body portion having a moderately high degree of biaxial orientations with orientation induced crystallinity bas

[ We claim:] [1.] An intermediate product comprising:an expanded biaxially-oriented polyester preform container, the contains including a neck finish, a body portion and a base portion;the body portion having a moderately high degree of biaxial orientations with orientation induced crystallinity based on a planar stretch ratio of 9 to 12, said orientation providing both thermal stability and a high resistance to internal pressurization of the container;the base portion being substantially thicker than the body portion to provide both thermal stability and a high resistance to internal pressurization of the container; andthe container having been filled with a hot product at a temperature of 185.degree.-190.degree. F., sealed by application of a closure to the neck finish and internally pressurized at a pressure of 40 to 45 psig.