Method of making a disposable cassette with negative head height fluid supply
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United States of America Patent
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-
Aug 29, 2000
Grant Date -
N/A
app pub date -
Sep 10, 1996
filing date -
May 1, 1992
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method of radio frequency (RF) welding of a flexible PVC sheet to a rigid copolyester carrier by holding a flexible PVC sheet and a rigid copolymer carrier together between heated RF dies. A predetermined temperature differential is maintained between the RF dies, with the flexible sheet side at a higher temperature than the rigid carrier side and adjusted so that a weld plane is established along the interface between the PVC and the copolyester. An RF weld signal is passed through the first and second RF dies and the PVC and copolyester therebetween, so that the flexible PVC sheet and the copolyester rigid carrier partially melt and become welded together at the weld plane.
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