Method for making thin walled, closed-ended, tubular articles of

Details Method for making thin walled, closed-ended, tubular articles of Method for making thin walled, closed-ended, tubular articles of

1995-05-31

1997-02-04

Brown, Michael A.

Surgery

Male reproductory tract shields or birth control devices

123844, 123918, A61F 602

Patent

active

055988504

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: 4399160 (1982-11-01), Myers et al.
patent: 4552717 (1985-11-01), Murley
patent: 4576156 (1986-03-01), Dyck
patent: 5098755 (1992-03-01), Tanquary
patent: 5176152 (1993-01-01), Wheeler
patent: 5199444 (1993-04-01), Wheeler
patent: 5351698 (1994-10-01), Wheeler

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