Method for making thin walled closed ended tubular articles of t

Details Method for making thin walled closed ended tubular articles of t Method for making thin walled closed ended tubular articles of t

1995-05-31

1997-02-11

Brown, Michael A.

Surgery

Male reproductory tract shields or birth control devices

Condoms

128918, A61F 604

Patent

active

056010923

ABSTRACT:
A process for drawing, with plug assist, thin walled, closed-ended, tubular articles of thermoplastic elastomer is disclosed as well as a thermoplastic elastomer and apparatus therefor. According to the process, a plug, extensible into the mold cavity, is employed concurrently with a varying air pressure differential across the faces of the preform to bias the flow of the drawn article axially along the length of the tubular mold and away from the mold walls. At a point where the article is drawn substantially the length of the tubular mold, the mold is evacuated and the article finally formed against the mold walls. Such articles are usefully employed as condoms or finger cots.

REFERENCES:
patent: D246118 (1977-10-01), Okamoto
patent: 2577345 (1951-12-01), McEwen
patent: 4359160 (1982-11-01), Myers et al.
patent: 4552717 (1985-11-01), Murley et al.
patent: 4869723 (1989-09-01), Harmon

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