Disposable pull-on wearing article

• US 7,150,729 B2
• Filed: 07/01/2004
• Issued: 12/19/2006
• Est. Priority Date: 07/02/2003
• Status: Expired due to Fees

• Current Assignee: Unicharm Corporation
• Original Assignee: Unicharm Corporation
• Inventors: Shimada, Takaaki, Takada, Naoko
• Primary Examiner(s): Zalukaeva, Tatyana
• Application Number:
  US10/880,455
• Publication Number:
  US 20050004545A1
• Time in Patent Office: 901 Days
• Field of Search: 604/365, 604/366, 604/367, 604/368, 604/385.01, 60438524- 29, 604/385.101, 604/387
• US Class Current: 604/385.01
• CPC Class Codes: A61F 13/49001 having preferential bending zones, e.g. fold lines or grooves
• CPC Class Codes: A61F 13/49426 the barrier having an absorbent medium
• CPC Class Codes: A61F 13/4946 the edge leakage prevention means being an absorbent medium A61F13/49426 takes precedence
• CPC Class Codes: A61F 13/496 in the form of pants or briefs

Abstract

A disposable pull-on wearing article wherein: a body fluid absorbent assembly of a disposable pull-on wearing article is formed in a crotch region with a pair of inwardly folded portions on both sides of a longitudinal center line. The body fluid absorbent assembly comprises an hourglass-shaped core and a cover sheet used to cover this core. The core is formed its both side edges with notches and respective regions of the cover sheet lying in these notches are provided with a pair of crotch region elastic members extending in a back-and-forth direction and intersecting folding guide lines.

Claims

1. A disposable pull-on wearing article having a front waist region, a rear waist region and a crotch region, said crotch region being provided with a body fluid absorbent assembly extending over said crotch region and further into said front and rear waist regions, said body fluid absorbent assembly having a substantially rectangular shape and having inner surface, outer surface and transversely opposite side edges extending substantially parallel to each other into said front and rear waist regions, said body fluid absorbent assembly being normally curved in a U-shape with said inner surface extending in said front and rear waist regions opposed to itself and, in said crotch region, said body fluid absorbent assembly having a pair of first folding guide lines extending from a midpoint of a crossline extending across said crotch region or from two points on said crossline which are equidistant in opposite directions from said midpoint to said transversely opposite side edges of said body fluid absorbent assembly placed aside toward said front waist region at a crossing angle a with respect to said crossline and a pair of second folding guide lines extending from said midpoint or said two points to said transversely opposite side edges of said body fluid absorbent assembly placed aside toward said rear waist region at a crossing angle β

with respect to said crossline, and said body fluid absorbent assembly including a pair of sections of respective said transversely opposite side edges defined between said first folding guide line and said second folding guide line to be folded inwardly of said body fluid absorbent assembly along these first and second folding guide lines, said disposable pull-on wearing article further comprising;

said body fluid absorbent assembly comprising a body fluid absorbent core and a body fluid pervious cover sheet adapted to cover said core and to define at least said inner surface of said body fluid absorbent assembly, said core being formed on both sides of said crotch region with notches so as to have a relatively narrow width in said crotch region and a relatively large width in said front and rear waist regions and thereby to have an hourglass-like shape as a whole, said cover sheet having a width substantially in conformity with the sections of said core lying in said front and rear waist regions but having extending outward beyond said notches in said crotch region, and said extensions of said cover sheet beyond said notches or any sheet placed upon said extensions of said cover sheet being provided with crotch region elastic members attached thereto in stretched or non-stretched state so that said crotch region elastic members extend in said back-and-forth direction and intersect said first and second folding guide lines.

2. The pull-on wearing article according to claim 1, wherein said body fluid absorbent assembly is provided along said opposed side edges with leak-barrier cuffs each made of a sheet member, respective said sheet members being folded back in the transverse direction of said body fluid absorbent assembly from said outer surface onto said outer surface so as to cover said opposite side edges and respective outer side edges of said sheet members lying on said outer surface being bonded to said outer surface, longitudinally opposite ends of respective said sheet members lying in said front and rear waist regions being bonded to said outer and inner surfaces, in said notches of said core, respective said sheet members lying on said outer surface being bonded to said cover sheet and said crotch region elastic members being bonded to respective said sheet members.

3. The pull-on wearing article according to claim 1, wherein said crossing angles α

, β

are in a range of 10°

to 60° and

said crossing angle β

is in a range of 10 to 30°

.

4. The pull-on wearing article according to claim 1, wherein said pants-type wearing article is formed with a pair of leg-holes and a leg elastic members attached to upper halves of peripheral portions surrounding the respective leg-holes intersect the adjacent ends of said crotch region elastic members.