Multi-layer blow molded container and process for preparation th

Details Multi-layer blow molded container and process for preparation th Multi-layer blow molded container and process for preparation th

1975-02-21

1978-03-21

Dixon, Jr., William R.

Bottles and jars

Ejecting

Siphon type

264 97, 264 98, 264 99, 264173, 428 35, 428174, 428474, 428483, 428516, B65D 2300, B29C 1706

Patent

active

040798500

ABSTRACT:
In a multi-layer blow molded container having a joint portion at least in the bottom portion thereof, barrier characteristics to gases such as oxygen and water vapor and liquids such as water, solvents, aqueous ammonia and salt water and interlaminar strength characteristics such as interlaminar adhesion strength, peel strength and impact strength in the content-filled state can be highly improved by blow molding a parison of a laminate structure of two or more polymer layers in which the polymer composition is different with respect to the thickness direction of the container wall but substantially identical with respect to the plane direction and each of the polymer layers is continuous with respect to the plane direction, in such a manner that a tapered projection protruding outwardly in the thickness direction of the container wall is formed in the joint portion so that each of the polymer layers is substantially continuous in this joint portion. This improved container can easily be prepared according to the customary blow molding technique by using a pair of split molds having such a configuration that a tapered concave groove is formed in the section pinching off the parison when the molds are registered with each other.

REFERENCES:
patent: 2710987 (1955-06-01), Sherman
patent: 3457337 (1969-07-01), Turner
patent: 3561629 (1971-02-01), Turner
patent: 3847728 (1974-11-01), Hirata et al.
patent: 3869056 (1975-03-01), Valyi
patent: 3892828 (1975-07-01), Weatherly et al.

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