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Reverse osmosis support substrate and method for its manufacture

  • US 5,851,355 A
  • Filed: 11/27/1996
  • Issued: 12/22/1998
  • Est. Priority Date: 11/27/1996
  • Status: Expired due to Term
First Claim
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1. A method of manufacturing a nonwoven web made from a furnish comprising:

  • 5 to 40 wt. % of polymer staple fibers having a denier greater than 0.2 but less than 1.0;

    0to 60 wt. % of polymer staple fibers having a denier greater than 1.0 but less than 3.0;

    15 to 50 wt. % of co-polymer/polymer bicomponent fibers having a first co-polymer sheath material which melts at a first melting temperature less than the melting temperature of said polymeric staple fibers; and

    1 to 10 wt. % of co-polymer/polymer bicomponent fibers having a second co-polymer sheath material which melts at a second melting temperature less than the first melting temperature, comprising the steps of;

    wet-laying a mat of fibers from said furnish using a papermaking machine;

    drying said wet-laid mat at a drying temperature greater than said second melting temperature and less than said first melting temperature; and

    calendaring said web at a calendering temperature greater than said first melting temperature and less than said melting temperature of said polymeric staple fibers.

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