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Water-disintegratable fibrous sheet having layered structure and wiping sheet comprising the same

  • US 6,187,141 B1
  • Filed: 09/16/1998
  • Issued: 02/13/2001
  • Est. Priority Date: 09/24/1997
  • Status: Expired due to Term
First Claim
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1. A water-disintegratable wiping sheet used in a wet state comprising two water-disintegratable fibrous sheets, whereineach of said water-disintegratable fiber sheets comprises:

  • a first fiber web comprising pulp of conifer and pulp of hardwood without a binder;

    a second fiber web comprising pulp of conifer, said second fiber web containing no pulp of hardwood and said first fiber web and second fiber web forming a layered structure; and

    a water-insoluble or water-swellable binder added to only said second fiber web;

    said second fiber web has a higher wet strength than the first fiber web, and said first fiber web is more water disintegratable than said second fiber web, and wherein said two water-disintegratable fibrous sheets have a wet strength of 75 g/25 mm or higher and are partially bonded one on the other with a water-soluble adhesive so that said second fiber web faces outside of said wiping sheet.

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