Disposable wearing article

• US 8,945,081 B2
• Filed: 11/25/2010
• Issued: 02/03/2015
• Est. Priority Date: 11/30/2009
• Status: Active Grant

• Current Assignee: Unicharm Corporation
• Original Assignee: Unicharm Corporation
• Inventors: Takino, Shunsuke
• Primary Examiner(s): Hand, Melanie
• Assistant Examiner(s): HAIRELL, AUNDRIA C
• Application Number:
  US13/508,146
• Publication Number:
  US 20120226254A1
• Time in Patent Office: 1,531 Days
• Field of Search: 604/385.3, 604/396, 604/385.24
• US Class Current: 604/396
• CPC Class Codes: A61F 13/49014 the elastic means is located at the side panels
• CPC Class Codes: A61F 13/49061 the diaper having one or two waist members forming the diaper waist region and an independent absorbent structure attached to the one or two waist members forming the crotch region
• CPC Class Codes: A61F 13/496 in the form of pants or briefs
• CPC Class Codes: A61F 2013/49028 with different tensile stress

Abstract

A disposable wearing article having a rear waist region which includes a rear waist main section facing a front waist region and a buttocks-covering section lying adjacent to a crotch region. The rear waist main section is divided into an upper area lying adjacent to a waist-opening and a lower area lying adjacent to the crotch region wherein a tensile stress per unit width dimension in the buttocks-covering section is lower than a tensile stress per unit width dimension in the lower area of the rear waist main section.

Claims

1. A disposable wearing article comprising:

a longitudinal direction;

a transverse direction orthogonal to said longitudinal direction;

a front waist region;

a rear waist region;

a crotch region extending between said front and rear waist regions;

a waist-opening;

a pair of leg-openings;

annular elastic waist panels defining said front and rear waist regions; and

a liquid-absorbent structure attached to the inner surface of said elastic waist panel to define at least a part of said crotch region;

side edges of the front and rear waist regions being put flat together and joined to each other at seam spots extending in the longitudinal direction;

said rear waist region comprising a rear waist main section joined to the front waist region through the seam spots and a buttocks-covering section lying adjacent to said crotch region below the seam spots;

said rear waist main section being divided into an upper area lying adjacent to said waist-opening and a lower area lying adjacent to said crotch region;

a tensile stress per unit width dimension in said buttocks-covering section being lower than a tensile stress per unit width dimension in said lower area of said rear waist main section;

said front waist region being divided into an upper area lying adjacent to said waist-opening and a lower area lying adjacent to said crotch region; and

said lower area of said front waist region and said lower area of said rear waist main section being contiguous between said front and rear waist region;

wherein a tensile stress per unit width of said lower area of said front waist region is equal to a sum of a tensile stress per unit width of said lower area of said rear waist main section and a tensile stress per unit width of said buttocks-covering section,

said front waist region includes a plurality of elastic elements associated therewith arranged to extend in said transverse direction and spaced one from another in said longitudinal direction;

said rear waist section includes a plurality of elastic elements associated therewith arranged to extend in said transverse direction and spaced one from another in said longitudinal direction;

said buttocks-covering section includes a plurality of elastic elements each in a form of a string or a strand associated therewith arranged to extend in said transverse direction and spaced one from another in said longitudinal direction; and

a spacing among said elastic elements associated with said buttocks-covering section is larger than a spacing among said elastic elements associated with said front waist region and said rear waist main section.

2. The wearing article defined by claim 1, wherein said buttocks-covering section is divided into an upper portion lying adjacent to said rear waist main section and a lower portion lying adjacent to said crotch region wherein a tensile stress per unit width dimension at least in said upper portion is lower than a tensile stress per unit width dimension in said lower area of said rear waist main section.

3. The wearing article defined by claim 2, wherein said buttocks-covering section includes, between said upper portion and said lower portion, a middle portion provided with none of said elastic elements associated therewith.

4. The wearing article defined by claim 2, wherein said elastic elements associated with said upper area for said front waist region comprising four elastic elements located in a vicinity of said waist-opening each having a diameter in a range of 450 to 500 dtex and an elongation ratio in a range of 2.4 to 2.8 and eleven elastic elements each having a diameter in a range of 450 to 500 dtex and an elongation ratio in a range of 1.8 to 2.4 wherein each pair of said adjacent elastic elements is spaced from each other by a range of 5.0 to 6.0 mm and said elastic elements associated with said lower area of said front waist region comprising five elastic elements each having a diameter in a range of 450 to 500 dtex and an elongation ratio in a range of 1.8 to 2.4 wherein each pair of said adjacent elastic elements is spaced from each other by a range of 5.0 to 6.0 mm and a distance dimension R1 between a lower most one of said elastic elements associated with a lower area of said front waist region and a lower end of said front waist region is in a range of 5.0 to 20.0 mm.

5. The wearing article defined by claim 1, wherein said elastic elements associated with said buttocks-covering section are inactivated in a region occupied by said liquid-absorbent structure.

6. The wearing article defined by claim 1, wherein said wearing article has a total length of said diaper in said longitudinal direction in a range of 470 to 510 mm, length dimensions of said front waist region and said rear waist main section in said longitudinal direction in a range of 95 to 125 mm and a length dimension of said buttocks-covering section in said longitudinal direction Y in a range of 45 to 65 mm.

7. The wearing article defined by claim 1, wherein said elastic elements associated with said upper area of said rear waist main section comprising five elastic elements allocated to said side of said waist-opening each having a diameter in a range of 450 to 500 dtex and an elongation ratio in a range of 2.4 to 2.8 and eleven elastic elements each having a diameter in a range of 450 to 500 dtex and an elongation ratio in a range of 1.8 to 2.4 wherein a distance dimension between said adjacent elastic elements is in a range of 5.0 to 6.0 mm, said elastic elements associated with said lower area of said rear waist main section comprising five elastic elements each having a diameter in a range of 450 to 500 dtex and an elongation ratio in a range of 1.8 to 2.4 wherein a distance dimension between said adjacent elastic elements is in a range of 5.0 to 7.0 mm.

8. The wearing article defined by claim 1, wherein said elastic elements associated with said buttocks-covering section comprising four elastic elements each having a diameter in a range of 450 to 500 dtex and an elongation ratio in a range of 1.8 to 2.6 wherein a distance dimension between said lowermost elastic element in an upper portion of said buttocks-covering section and said elastic element allocated in a middle portion of said buttocks-covering section as well as a distance dimension between said elastic element allocated in said middle portion of said buttocks-covering section and said elastic element allocated in a lower portion of said buttocks-covering section is in a range of 15.0 to 25.0 mm wherein a distance dimension between said elastic element allocated in said lower portion of said buttocks-covering section and said lower end of said buttocks-covering section is in a range of 5.0 to 20.0 mm.