Absorbent core with absorbent material pattern

• US 10,052,242 B2
• Filed: 05/05/2015
• Issued: 08/21/2018
• Est. Priority Date: 05/27/2014
• Status: Active Grant

• Current Assignee: The Procter & Gamble Company
• Original Assignee: The Procter & Gamble Company
• Inventors: Bianchi, Ernesto Gabriel, Jackels, Hans Adolf
• Primary Examiner(s): Ditmer, Kathryn E
• Application Number:
  US14/703,968
• Publication Number:
  US 20150342796A1
• Time in Patent Office: 1,204 Days
• CPC Class Codes: A61F 13/15634 Making fibrous pads between sheets or webs
• CPC Class Codes: A61F 13/15666 Wrapping formed fibrous webs or pads, e.g. the pads being formed by uniting pad pieces cut from fibrous webs
• CPC Class Codes: A61F 13/51108 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 Class Codes: A61F 13/5323 having absorbent material located in discrete regions, e.g. pockets
• CPC Class Codes: A61F 13/535 inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes A61F13/5323, A61F13/537 take precedence
• CPC Class Codes: A61F 13/539 characterised by the connection of the absorbent layers with each other or with the outer layers

Abstract

A substantially planar absorbent core (28) extending in a transversal direction (x) and a longitudinal direction (y), comprising a core wrap (16, 16′) enclosing an absorbent material (60), wherein the absorbent material is substantially free of cellulose fibers and forms a pattern of discrete absorbent material areas. The pattern comprises dot-shaped areas (751) and at least one of transversally-orientated areas (752) or longitudinally-orientated areas (754). The absorbent core may also comprise a pair of channel-forming areas (26).

Claims

1. A substantially planar absorbent core having a width extending in a transversal direction and a length extending in a longitudinal direction, and comprising a core wrap enclosing an absorbent material, wherein the absorbent material is substantially free of cellulose fibers and the absorbent material forms a pattern of discrete absorbent material areas, wherein the pattern comprises:

dot-shaped areas and transversally-orientated areas, wherein each of the dot-shaped areas has a longitudinal dimension as measured by projection on a line parallel to the longitudinal direction and a transversal dimension as measured by projection on a line parallel to the transversal direction, and the ratio of the longitudinal dimension to the transversal direction ranges from about 0.5 to about 2.0; and

wherein the transversally-orientated areas have a width of from 50% to 99% of the width of the absorbent core and

wherein the dot-shaped areas are separated by separation areas substantially free of absorbent material, wherein a top side of the core wrap is unattached to a bottom side of the core wrap in the separation areas; and

wherein the absorbent core further comprises at least one channel-forming area which is substantially free of absorbent material and through which the top side of the core wrap is attached to the bottom side of the core wrap by a core wrap bond, so that when the absorbent material adjacent the channel-forming area absorbs a fluid and swells, a three-dimensional channel is formed along the core wrap bond;

and wherein the channel-forming area interrupts at least some of the transversally-orientated areas to form interrupted transversally-orientated areas.

2. The absorbent core of claim 1, wherein the dot-shaped areas are aligned along a plurality of transversally-orientated parallel rows.

3. The absorbent core of claim 1, wherein at least some of the dot-like areas are comprised in a back third region of the absorbent core and some of the transversally-orientated areas are comprised in a middle third region and/or a front third region of the core.

4. The absorbent core of claim 1, comprising at least two longitudinally-orientated channel-forming areas.

5. The absorbent core of claim 4, wherein the two longitudinally-orientated channel-forming areas are mirror images of each other relative to a longitudinal axis of the core.

6. The absorbent core of claim 5, wherein the two longitudinally-orientated channel-forming areas are concave towards the longitudinal axis.

7. The absorbent core of claim 1, wherein the absorbent core comprises from about 1 g to about 8 g of absorbent material.

8. The absorbent core of claim 7, wherein the absorbent material comprises superabsorbent polymer particles.

9. The absorbent core of claim 1, further comprising a thermoplastic adhesive material to immobilize at least some of the absorbent material within the core wrap.

10. The absorbent core of claim 9, wherein the thermoplastic adhesive material comprises an auxiliary glue on the inner side of at least one of the top side and the bottom side of the core wrap.

11. The absorbent core of claim 9, wherein the thermoplastic adhesive material is a microfibrous glue.

12. The absorbent core of claim 1, wherein the core wrap comprises a first substrate and a second substrate and the substrates are C-wrap bonded along longitudinally-extending side edges of the absorbent core.

13. The absorbent core of claim 1, wherein the absorbent material is macroscopically profiled in the longitudinal direction so that the basis weight of the absorbent material is higher in a middle third region of the core than in a front third region and/or a back third region of the core.

14. An absorbent article comprising the absorbent core of claim 1.