Water-disintegratable fibrous sheet having layered structure and wiping sheet comprising the same
AssigneeUni-Charm Corporation
InventorsNaohito Takeuchi, Takayoshi Konishi, Daisuke Yamada
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Abstract
A water-disintegratable fibrous sheet having a layered structure comprising: (a) at least one first fiber web comprising pulp of conifer and pulp of hardwood; (b) at least one second fiber web comprising pulp of conifer, having a content of pulp of hardwood less than that in said first fiber web or containing no pulp of hardwood, said first and second fiber webs forming said layered structure; and (c) a water-insoluble or water-swellable binder being added to at least one of said first and second fiber webs. The fibrous sheet excellent in water-disintegratability and strength can be obtained.
Claims8
A water-disintegratable wiping sheet used in a wet state comprising two water-disintegratable fibrous sheets, wherein
- each 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.
Dependencies are inferred from the claim text.