Disposable diaper having excellent migration speed and satisfactory feeling

Patent metadata

Field	Value
Publication number	US-9237974-B2
Application number	US-201113824519-A
Country	US
Kind code	B2
Filing date	Sep 26, 2011
Priority date	Sep 30, 2010
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

A disposable diaper includes a liquid-permeable top sheet, a liquid-impermeable back sheet and an absorber between the top sheet and back sheet, and having a front body waist region, a crotch region and a back body waist region. The top sheet is a nonwoven fabric having on the skin contact surface a plurality of ridges and a plurality of recesses extending in the lengthwise direction of the disposable diaper, and alternating in the widthwise direction perpendicular to the lengthwise direction. The top sheet has point-like compressed sections at a prescribed density in the front body waist region and/or back body waist region, the ridges in prescribed zones having different heights than the adjacent ridges at the same location in the lengthwise direction.

First claim

The invention claimed is:

1. A disposable diaper comprising a liquid-permeable top sheet, a liquid-impermeable back sheet and an absorber between the top sheet and back sheet, and having a front body waist region, a crotch region and a back body waist region,
wherein the top sheet is a nonwoven fabric having on the skin contact surface a plurality of ridges and a plurality of recesses extending in the lengthwise direction of the disposable diaper, and alternating in the widthwise direction perpendicular to the lengthwise direction,
the top sheet has point-like compressed sections, formed by compressing the ridges and/or recesses on the front body waist region and/or the back body waist region, at a density in the range of 4.0-7.0/cm 2 , and
zones of ridges are present in the front body waist region and/or the back body waist region, sandwiched by two point-like compressed sections, the ridges in those zones have different heights than the adjacent ridges at the same location in the lengthwise direction.

2. The disposable diaper according to claim 1 , wherein the top sheet has point-like compressed sections in both the front body waist region and the back body waist region.

3. The disposable diaper according to claim 1 , wherein the top sheet has point-like compressed sections formed by compressing ridges and/or recesses on the crotch region, at a density of no greater than 4.0/cm 2 and zones of ridges are present between two point-like compressed sections in the crotch region, the ridges in those zones have different heights than the adjacent ridges at the same location in the lengthwise direction.

4. The disposable diaper according to claim 1 , wherein the proportion of fibers oriented in the lengthwise direction of the ridges is higher than the proportion of fibers oriented in the lengthwise direction of the recesses.

5. The disposable diaper according to claim 1 , wherein the point-like compressed sections are formed by continuous compressing of ridges and/or recesses at a fixed spacing, and create a point-like compressed groove.

6. The disposable diaper according to claim 5 , wherein the point-like compressed groove is roughly linear, and is crossing with the lengthwise direction at an angle of θ(0°<θ≦90°).

7. The disposable diaper according to claim 6 , wherein a lattice is formed by a plurality of point-like compressed grooves.

8. The disposable diaper according to claim 6 , wherein the spacing of the point-like compressed sections in the widthwise direction is equal to or shorter than the pitch of irregularities formed by the ridges and recesses.

9. The disposable diaper according to claim 1 , wherein the lengths of the point-like compressed sections in the widthwise direction are shorter than the widths of the ridges.

10. The disposable diaper according to claim 1 , wherein the ridges in the zones have different heights than their two adjacent ridges in the same location in the lengthwise direction.

11. The disposable diaper according to claim 1 , wherein the point-like compressed sections have areas in the range of 0.2-9 mm 2 .

12. The disposable diaper according to claim 1 , wherein the spacings between the point-like compressed sections are in the range of 2.0-4.0 mm.

13. The disposable diaper according to claim 1 , wherein the point-like compressed sections are all formed by compressing of ridges.

14. The disposable diaper according to claim 1 , wherein the ridges in the zones of ridges have different distances between the two point-like compressed sections of the ridge than those of the adjacent ridges.

15. The disposable diaper according to claim 1 , wherein the point-like compressed sections are point compressed sections.

16. The disposable diaper according to claim 1 , wherein the point-like compressed sections are circular compressed sections.

17. The disposable diaper according to claim 1 , wherein the point-like compressed sections are compressed sections within the boundaries of respective ridges.

18. A disposable diaper comprising a liquid-permeable top sheet, a liquid-impermeable back sheet and an absorber between the top sheet and back sheet, and having a front body waist region, a crotch region and a back body waist region,
wherein the top sheet is a nonwoven fabric having on the skin contact surface a plurality of ridges and a plurality of recesses extending in the lengthwise direction of the disposable diaper, and alternating in the widthwise direction perpendicular to the lengthwise direction,
the top sheet has compressed sections having a diameter that is within the diameter of the ridges normal to the lengthwise direction of the ridges, formed by compressing the ridges and/or recesses on the front body waist region and/or the back body waist region, at a density in the range of 4.0-7.0/cm 2 , and
zones of ridges are present in the front body waist region and/or the back body waist region, sandwiched by two point-like compressed sections, the ridges in those zones have different heights than the adjacent ridges at the same location in the lengthwise direction.

19. The disposable diaper according to claim 18 , wherein the compressed sections are point compressed sections.

20. The disposable diaper according to claim 18 , wherein the compressed sections are circular compressed sections.

21. The disposable diaper according to claim 18 , wherein the ridges in the zones of ridges have different distances between the two point-like compressed sections of the ridge than those of the adjacent ridges.

Assignees

• Ohashi Naoto
• Yago Toshiya
• Unicharm Corp

Inventors

• Ohashi Naoto
• Yago Toshiya

Classifications

• A61F13/49 Primary

  specially adapted to be worn around the waist, e.g. diapers, nappies · CPC title

• A61F13/514

  Backsheet, i.e. the impermeable cover or layer furthest from the skin {(A61F13/15211, A61F13/15252 take precedence)} · CPC title

• A61F13/53

  characterised by the absorbing medium (A61F13/20 takes precedence) · CPC title

• A61F13/51108 Primary

  the top sheet having corrugations or embossments having one axis relatively longer than the other axis, e.g. forming channels or grooves in a longitudinal direction · CPC title

• A61F13/511

  Topsheet, i.e. the permeable cover or layer facing the skin · CPC title