B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
154/102
B32B 5/26 (2006.01) B01D 69/10 (2006.01) D04H 1/54 (2006.01) D06M 17/00 (2006.01)
Patent
CA 1272945
ABSTRACT Disclosed is a semipermeable membrane support and a process for making the same. The support is formed of a non-woven fabric of A laminated structure having a low density layer with an air permeability of 5 to 50 cc/cm2/sec and a high density layer with an air permeability of 0.1 cc/cm2/sec to 5 cc/cm2/sec, the non-woven fabric having an overall air permeability of 0.1 to 4.5 cc/cm2/sec. The process for preparing such a support consists of laminating a dry processed web, which comprises entirely polyester fibers containing 20 to 80% of undrawn polyester fiber or conjugate polyester fibers having an average fiber denier of 1 to 3 denier formed through a dry process, and an un-press treated wet processed web, which comprises entirely polyester fibers containing 30 to 902 of undrawn polyester fibers or conjugate polyester fibers having fiber denier of 0.1 to 1.5 denier formed through a paper making process and subsequent drying process with hot air to self-bond lightly, pressing said laminated dry processed web and wet processed web with a heated calender at a sufficient temperature for bonding firmly the laminated web.
505225
Shinjou Ietsugu
Shoji Rikuo
Borden Ladner Gervais Llp
Firma Carl Freudenberg
Freudenberg Carl
Shinjou Ietsugu
Shoji Rikuo
LandOfFree
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