Semipermeable membrane with intercommunicating pores for pressing apparatus
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United States of America Patent
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Issued Date -
May 13, 2004
app pub date -
Nov 4, 2003
filing date -
Sep 30, 1999
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A unitary membrane for use in a pressing apparatus includes a pair of longitudinal edge portions and a semipermeable portion having a plurality of intercommunicating pores. The semipermeable portion is positioned between the pair of longitudinal edge portions. Wherein the unitary membrane includes a formed fabric and has a thickness less than about 0.1 inches. The semipermeable portion has a permeability greater than zero and less than about five CFM per square foot as measured by TAPPI test method TIP 0404-20. A method of making the unitary membrane includes the steps of providing a carrier fabric which is very permeable and forming a plurality of intercommunicating pores in the carrier fabric.
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