Absorbent pad having zones with different flexibilities

• US 7,547,815 B2
• Filed: 09/26/2005
• Issued: 06/16/2009
• Est. Priority Date: 09/30/2004
• Status: Expired due to Fees

• Current Assignee: Unicharm Corporation
• Original Assignee: Unicharm Corporation
• Inventors: Kamiyama, Ryuichi, Oku, Tomomi, Ohashi, Naoto, Kawakami, Hikari
• Primary Examiner(s): KIDWELL, MICHELE M
• Application Number:
  US11/234,155
• Publication Number:
  US 20060069371A1
• Time in Patent Office: 1,359 Days
• Field of Search: 604/385.01, 604/367, 604378-380, 604/385.101
• US Class Current: 604/378
• CPC Class Codes: A61F 13/4704 having preferential bending zones, e.g. fold lines or grooves
• CPC Class Codes: A61F 13/4752 the means being an upstanding barrier
• CPC Class Codes: A61F 13/4756 the means consisting of grooves, e.g. channels, depressions or embossments, resulting in a heterogeneous surface level
• CPC Class Codes: A61F 13/476 characterised by encircling the crotch region of the undergarment
• CPC Class Codes: A61F 13/533 having discontinuous areas of compression
• CPC Class Codes: A61F 13/536 having discontinuous areas of compression

Abstract

A disposable absorbent pad includes an absorbent fibrous structure having a longitudinal axis, a transverse axis, and front and rear regions aligned with each other in a direction along the longitudinal axis. The pad has a flexibility of the front region higher than in rear region.

Claims

1. An absorbent pad, comprising:

an absorbent fibrous structure having a longitudinal direction, a transverse direction perpendicular to the longitudinal direction, a first surface, a second surface opposite to said first surface, and front and rear regions successively arranged in the longitudinal direction, and

a flexibility of said front region being higher than that of said rear region and defined at least by a first flexible region about which the absorbent fibrous structure is bendable,

wherein

the first flexible region comprises a through hole or groove which is longitudinally and continuously elongated along the longitudinal direction and which is present in the front region only, without extending into the rear region,

the rear region defines about half of an entire length of the absorbent pad and is free of through-holes or grooves,

the first flexible region is a central flexible region elongated along and located on a longitudinal center axis of the absorbent fibrous structure,

the higher flexibility of said front region is further defined by second and third flexible regions about which the absorbent fibrous structure is bendable, and which are positioned exclusively in said front region on opposite sides of the first flexible region, and longitudinally and continuously elongated in the longitudinal direction without extending into the rear region, and

said first flexible region comprises a linear through-hole extending through an entire thickness of said absorbent fibrous structure, and said second and third flexible regions comprise grooves depressed into the absorbent fibrous structure without extending through the entire thickness of said absorbent fibrous structure.

2. The absorbent pad as defined by claim 1, wherein the entire thickness of said absorbent fibrous structure is from 1 to 10 mm and said linear through-hole has a width in a range of 5 to 25 mm as measured in the transverse direction.

3. The absorbent pad as defined by claim 1, wherein an entire length of said linear though-hole as measured in the longitudinal direction corresponds to a range of 10 to 60% of an entire length of said absorbent fibrous structure as measured in the longitudinal direction.

4. The absorbent pad as defined by claim 3, wherein an entire length of each of said grooves as measured in the longitudinal direction corresponds to a range of 10 to 50% of the entire length of said absorbent fibrous structure as measured in the longitudinal direction.

5. The absorbent pad as defined by claim 1, wherein said grooves are depressed into the absorbent fibrous structure only from said second surface which is adapted to face away from a wearer'"'"'s body, in use.

6. An absorbent pad, comprising:

an absorbent fibrous structure having a longitudinal direction, a transverse direction perpendicular to the longitudinal direction, a first surface, a second surface opposite to said first surface, and front and rear regions successively arranged in the longitudinal direction, and

a flexibility of said front region being higher than that of said rear region and defined at least by a first flexible region about which the absorbent fibrous structure is bendable,

wherein

the first flexible region comprises a through hole or groove which is longitudinally and continuously elongated along the longitudinal direction and which is present in the front region only, without extending into the rear region,

the rear region defines about half of an entire length of the absorbent pad and is free of through-holes or grooves,

the first flexible region is a central flexible region elongated along and located on a longitudinal center axis of the absorbent fibrous structure,

the higher flexibility of said front region is further defined by second and third flexible regions about which the absorbent fibrous structure is bendable, and which are positioned exclusively in said front region on opposite sides of the first flexible region, and longitudinally and continuously elongated in the longitudinal direction without extending into the rear region, and

said second flexible region and third flexible region are spaced from each other, in the transverse direction, by a dimension in a range of 60 to 90 mm.

7. An absorbent pad, comprising:

an absorbent fibrous structure having a longitudinal direction, a transverse direction perpendicular to the longitudinal direction, a first surface, a second surface opposite to said first surface, and front and rear regions successively arranged in the longitudinal direction, and

a flexibility of said front region being higher than that of said rear region and defined at least by a first flexible region about which the absorbent fibrous structure is bendable,

wherein

the first flexible region comprises a through hole or groove which is longitudinally and continuously elongated along the longitudinal direction and which is present in the front region only, without extending into the rear region,

the rear region defines about half of an entire length of the absorbent pad and is free of through-holes or grooves,

the first flexible region is a central flexible region elongated along and located on a longitudinal center axis of the absorbent fibrous structure,

the higher flexibility of said front region is further defined by second and third flexible regions about which the absorbent fibrous structure is bendable, and which are positioned exclusively in said front region on opposite sides of the first flexible region, and longitudinally and continuously elongated in the longitudinal direction without extending into the rear region, and

said first flexible region comprises a through-hole extending through an entire thickness of said absorbent fibrous structure, and each of said second and third flexible regions comprises at least one groove depressed into the absorbent fibrous structure without extending through the entire thickness of said absorbent fibrous structure.

8. The absorbent pad as defined by claim 7, wherein said at least one groove is depressed only from said second surface which is hydrophobic and adapted to face away from a wearer'"'"'s body, in use.