METHOD AND APPARATUS FOR THE MANUFACTURE OF DUCKBILL VALVES

摘要

PCT No. PCT/GB95/01910 Sec. 371 Date May 14, 1997 Sec. 102(e) Date May 14, 1997 PCT Filed Aug. 14, 1995 PCT Pub. No. WO96/05458 PCT Pub. Date Feb. 22, 1996A method and apparatus for manufacture of duckbill valves in which the opposed lips of the valve are split by applying a high fluid pressure inside the valve. This pressure causes the valve to balloon and burst. Preferably, the valve is supported over all of its outer surface except the end to be split by a die. The system is particularly suited to duckbill valves made of thermoplastic elastomer.