초록 ▼

This relates to the formation of a preform for a container which is formed primarily of PET and like saturated polyesters which are to be utilized in the packaging of a hot fill liquid and like product, particularly a container wherein a metal closure is to be utilized. The preform is of a laminated

This relates to the formation of a preform for a container which is formed primarily of PET and like saturated polyesters which are to be utilized in the packaging of a hot fill liquid and like product, particularly a container wherein a metal closure is to be utilized. The preform is of a laminated construction with the body of the preform being of a five layer construction and the neck finish portion being primarily of a three layer construction including outer layers of PET or like saturated polyester and a core formed of a high Tg polymer. The same high Tg polymer would be in the form of thin layers in the body of the preform between inner and outer layers and a core.

대표청구항 ▼

A preform for forming a blow molded container particularly adapted to receive a hot fill product and be closed by a screw threaded closure, said preform having a molded neck finish including external threads for receiving a closure, said preform being of a laminated construction and including at lea

A preform for forming a blow molded container particularly adapted to receive a hot fill product and be closed by a screw threaded closure, said preform having a molded neck finish including external threads for receiving a closure, said preform being of a laminated construction and including at least five layers below said neck finish and only three layers in the area of said threads; said five layers including inner and outer layers, inner and outer intermediate layers, and a core layer; said three layers including said inner and outer layers and a core layer, said core layer of said three layers forming a major portion of the cross section of said neck finish in the area of said threads, said core layer of said three layers being formed of a plastic having a higher Tg than said outer and inner layers, and said inner and outer intermediate layers being formed of the same material as said core layer of said three layers.