Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container
Patent
1990-02-22
1991-06-25
Terrell, William E.
Manufacturing container or tube from paper; or other manufacturi
Container making
Pliable container
493213, 493929, B31B 2584, B31B 4184
Patent
active
050263390
ABSTRACT:
A fluid bladder including a check valve inturned within the bladder. The bladder is formed of two thin sheets of plastic material sealed together around the periphery of the bladder. The check valve is formed of an extended mating pair of strips of the same two sheets of plastic overlying one another and heat bonded together by a high frequency electric field along two substantially parallel lines to form a central flow channel with a closed gap-free configuration. In forming the check valve, at least one pair of electrodes are employed, and insulating material is used to enclose the electrodes so that the two sheets of plastic material are maintained parallel and in contact with one another during welding and the subsequent cool-down interval, thereby assuring reliable check valve operation.
REFERENCES:
patent: 3230663 (1966-01-01), Shabram
patent: 4287920 (1981-09-01), Johnson
patent: 4645482 (1987-02-01), Yoshida
Royce Medical Company
Terrell William E.
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