Disposable wearing article

Patent metadata

Field	Value
Publication number	US-9592316-B2
Application number	US-201113812186-A
Country	US
Kind code	B2
Filing date	Jul 19, 2011
Priority date	Aug 10, 2010
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

A disposable wearing article adapted to prevent indicators from being transferred to a liquid-absorbent structure and to make the indicators develop the color reaction quickly in response to a discharge of body exudates. A disposable diaper has a topsheet, a backsheet and a liquid-absorbent structure interposed between these top- and backsheets. A surface of a first backsheet facing the liquid-absorbent structure is formed with indicators. The indicators contain a hot-melt polymer, an indicator agent adapted to develop a color reaction and a plasticizing oil. The liquid-absorbent structure has a liquid-absorbent core, a liquid-diffusive wrapping sheet adapted to wrap the core. A hydrophilic bottom sheet is interposed between a bottom surface of the core and a bottom surface region of the wrapping sheet. A dimension in the transverse direction of the bottom sheet is larger than a dimension of a region in which the indicators are formed and smaller than a dimension in the transverse direction of the core.

First claim

The invention claimed is:

1. A disposable wearing article having a longitudinal direction and a transverse direction, including:
a skin-facing side;
a non-skin-facing side opposite to the skin-facing side;
front and rear waist regions;
a crotch region extending between the front and rear waist regions;
a liquid-permeable topsheet lying on the skin-facing side a liquid-impermeable backsheet lying on the non-skin-facing side and;
a liquid-absorbent structure interposed between these top- and backsheets and placed at least in the crotch region, wherein
the backsheet is formed on the surface thereof facing the liquid-absorbent structure with at least one indicator adapted to develop a color reaction when the at least one indicator comes in contact with at least one of moisture and body exudates, wherein:
the liquid-absorbent structure includes a liquid-absorbent core and a liquid-diffusive wrapping sheet adapted to wrap the skin-facing surface and the non-skin-facing surface of the core and being continuous outboard of the core in the transverse direction; and
a bottom sheet formed of a hydrophilic fibrous nonwoven fabric is provided between the non-skin-facing surface of the core and the wrapping sheet so that the bottom sheet positionally corresponds to the at least one indicators wherein a dimension in the transverse direction of the bottom sheet is smaller than that of the core, so as to allow a surplus of urine discharged on the core to flow around the bottom sheet and the at least one indicator contains a hot-melt polymer, an indicator agent adapted to develop a color reaction and a plasticizing oil, and the at least one indicator is adapted to put in direct contact with the wrapping sheet, wherein an oil absorbency of the wrapping sheet is higher than that of the bottom sheet.

2. The disposable wearing article according to claim 1 , wherein a Klemm's water absorbency of the wrapping sheet is higher than that of the bottom sheet.

3. The disposable wearing article according to claim 1 , wherein most of fibers of the bottom sheet has a fiber orientation along one of the longitudinal direction and the transverse direction and a region formed with the at least one indicator extends along the fiber orientation of the bottom sheet.

4. The disposable wearing article according to claim 3 , wherein most of fibers of the wrapping sheet have a fiber orientation extending in one of the longitudinal direction and the transverse direction, and the wrapping sheet and the bottom sheet are layered on each other so that the fiber orientations of these two sheets coincide with each other.

5. The disposable wearing article according to claim 1 , wherein the core contains at least superabsorbent polymer particles and a content percentage of the superabsorbent polymer particles is in a range of 35 to 70% by mass of a total mass of the core.

6. The disposable wearing article according to claim 1 , wherein a center region of the topsheet is formed of a fibrous nonwoven fabric in which most of fibers of the topsheet has a fiber orientation extending along one of the longitudinal direction and the transverse direction, and the region formed with the at least one indicator extends in one of the longitudinal direction and the transverse direction so that the direction in which the region formed with the indicators extends is coincident with the fiber orientation of the topsheet.

Assignees

• Ichihara Keiko
• Yago Toshiya
• Ohashi Naoto
• Suekane Makoto
• Ishikawa Hiroki
• Unicharm Corp

Inventors

• Ichihara Keiko
• Yago Toshiya
• Ohashi Naoto
• Suekane Makoto
• Ishikawa Hiroki

Classifications

• A61L15/56 Primary

  Wetness-indicators or colourants · CPC title

• A61F13/42 Primary

  with wetness indicator or alarm · CPC title

• A61F2013/5312

  with structure resisting compression · CPC title

• A61F2013/422

  the alarm being a colour change · CPC title

• A61F13/15

  Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators · CPC title