Article having a non-absorbent resilient layer

• US 5,609,588 A
• Filed: 06/08/1994
• Issued: 03/11/1997
• Est. Priority Date: 05/29/1992
• Status: Expired due to Term

• Current Assignee: Kimberly-Clark Corporation
• Original Assignee: Kimberly-Clark Corporation
• Inventors: Gilman, Thomas H., King, David R., Finch, Valerie V., Stilp, Timothy S., DiPalma, Joseph, Couture-Dorschner, Laurie
• Primary Examiner(s): Weiss, John G.
• Assistant Examiner(s): REICHLE, KARIN M
• Application Number:
  US08/255,840
• Time in Patent Office: 1,007 Days
• Field of Search: 604/358, 604/365, 604/366, 604/368-370, 604/372-387, 604/389-390, 2/78 C, 2/401, 428/332, 428/337
• US Class Current: 604/369
• CPC Class Codes: A61F 13/15203 Properties of the article, e.g. stiffness or absorbency chemical aspects A61L15/00
• CPC Class Codes: A61F 13/4702 having a reinforcing member
• 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
• CPC Class Codes: A61F 2013/15357 Stiffness, e.g. Taber rigidity
• CPC Class Codes: A61F 2013/15365 Dimensions
• CPC Class Codes: A61F 2013/15373 Calliper, i.e. thickness
• CPC Class Codes: A61F 2013/15471 Total capacity
• CPC Class Codes: A61F 2013/530744 by the absorbency under load
• CPC Class Codes: A61F 2013/53463 with a reinforcing structure, e.g. net
• CPC Class Codes: A61F 2013/53791 being resilient or elastic
• CPC Class Codes: A61F 2013/586 on lateral flaps
• CPC Class Codes: Y10T 428/26 Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• CPC Class Codes: Y10T 428/266 of base or substrate

Abstract

An absorbent article, such as a sanitary napkin, has an absorbent and a substantially non-absorbent resilient layer adjacent to the absorbent. The absorbent is sufficiently stiff to resist twisting of the absorbent article during use. The resilient layer is sufficiently resilient to resist bunching during use. As a result, the absorbent article resists both twisting and bunching. The absorbent article has zones which vary in caliper, stiffness and absorbency. A central absorbent zone is thickest in caliper, more absorbent than the other zones and is stiffer than the other zones. An adjacent zone is less thick in caliper, less absorbent and less stiff. A peripheral zone, located near the outer side edges, is least thick in caliper, least absorbent and least stiff.

Claims

1. An absorbent article having a central longitudinal axis, a caliper of less than about 5 millimeters, and a total width adapted to span the width of a user'"'"'s labia majora, said absorbent article comprising:

a) an absorbent means having a predetermined length and width, a central longitudinal axis substantially aligned along the central longitudinal axis of said absorbent article, said absorbent means having the capacity to absorb at least 10 grams of body fluid; and

b) a substantially resilient layer comprising a closed cell, polyethylene foam having a width ranging from 60% to 100% of the total width of said absorbent article, said resilient layer being sufficiently resilient to resist bunching, as indicated by a Circular Bend Flex in the range of from about 9 to about 42 grams at a rebound resiliency of 50%.

15. The absorbent article of claim 1 wherein said absorbent means has a body-facing side and said absorbent article further comprises a transfer layer disposed on said body-facing side of said absorbent means.

2. An absorbent article adapted to receive and absorb body fluid and having a central longitudinal axis, said absorbent article comprising:

a) an absorbent means having a predetermined length and width, a central longitudinal axis substantially aligned along the central longitudinal axis of said absorbent article, said absorbent means capable of absorbing at least 10 grams of the body fluid deposited on said absorbent article; and

b) a substantially non-absorbent, substantially resilient layer positioned adjacent to said absorbent means, said resilient layer comprising a closed cell, polyethylene foam having a width greater than the predetermined width of said absorbent means and adapted to prevent bunching, as indicated by a Circular Bend Flex in the range of from about 9 to about 42 grams at a rebound resiliency of 50%, and wherein said absorbent article has a caliper of less than about 5 mm.

3. The absorbent article of claim 2 wherein said absorbent article has a body-facing side and a total width transverse to said longitudinal axis of said absorbent article defined by a distance from an outer side edge to an opposite outer side edge of the body-facing side of the absorbent article and said absorbent means has a width less than about 60% of the total width of said absorbent article.

4. The absorbent article of claim 2 wherein said substantially resilient layer has a length at least equal to the predetermined length of the absorbent means.

5. The absorbent article of claim 2 wherein said absorbent article comprises at least

a central absorbent zone and a peripheral zone, wherein said central absorbent zone is thicker in caliper, more absorbent and stiffer than zone;

and

said peripheral zone.

6. The absorbent article of claim 5 further comprising an adjacent zone located between said central absorbent zone and said peripheral zone, said adjacent zone being less thick in caliper, less absorbent and less stiff than said central absorbent zone;

said adjacent zone being thicker in caliper, more absorbent and stiffer than said peripheral zone.

7. The absorbent article of claim 6 wherein said central absorbent zone has a Gurley stiffness in the range of from about 782 milligrams to about 2526 milligrams, said adjacent zone has within it a center adjacent zone, said center adjacent zone has a Gurley stiffness in the range of from about 99 mg. to about 345 mg. and said center adjacent zone has a caliper in the range of from about 0.5 mm. to about 3.0 mm.

8. The absorbent article of claim 2 wherein said foam has a thickness of less than 1/8 inch.

9. The absorbent article of claim 2 wherein said resilient layer has a garment facing side and said absorbent article further comprises a baffle disposed on the garment facing side of said resilient layer.

10. The absorbent article of claim 2 further comprising a liquid-pervious cover sheet.

11. The absorbent article of claim 2 further comprising at least one tissue layer that extends beyond the absorbent means.

12. The absorbent article of claim 11 wherein said absorbent means has a garment-facing side and said at least one tissue layer is disposed on said garment-facing side of said absorbent means.

13. The absorbent article of claim 11 wherein said absorbent means has a body-facing side and said at least one tissue layer is disposed on said body-facing side of said absorbent means.

14. The absorbent article of claim 11 wherein said absorbent means has a body-facing side and a garment-facing side and said at least one tissue layer includes two tissue layers, said two tissue layer disposed on both said garment-facing side and said body-facing side of said absorbent means, respectively.

16. A sanitary napkin having a garment-facing side, a caliper of less than about 5 millimeters, and a central longitudinal axis, said sanitary napkin comprising:

a) a liquid-impermeable baffle disposed on said garment-facing side of said sanitary napkin, said baffle having a body-facing side;

b) a substantially non-absorbent, resilient layer comprising a closed cell, polyethylene foam and being disposed on said body-facing side of said baffle, said resilient layer adapted to prevent bunching, as indicated by a Circular Bend Flex in the range of from about 9 to about 42 grams at a rebound resiliency of 50%, said resilient layer having a body-facing side; and

c) an absorbent means disposed adjacent to said body-facing side of said resilient layer, said absorbent means having a central longitudinal axis substantially aligned along the central longitudinal axis of said napkin, said absorbent means adapted to resist twisting and capable of absorbing at least 10 grams of body fluid deposited on said napkin.

17. The sanitary napkin of claim 16 wherein said napkin comprises at least

a central absorbent zone and a peripheral zone, wherein said central absorbent zone is thicker in caliper, more absorbent and stiffer than the

peripheral zone and wherein said peripheral zone is located at an outer side edge of the napkin.

18. The sanitary napkin of claim 17 further comprising an adjacent zone located between said central absorbent zone and said peripheral zone, said adjacent zone being less thick in caliper, less absorbent and less stiff than said central absorbent zone;

said adjacent zone being thicker in caliper, more absorbent and stiffer than said peripheral zone.

19. The sanitary napkin of claim 17 wherein said central absorbent zone has a Gurley stiffness in the range of from about 782 milligrams to about 2526 milligrams.

20. A sanitary napkin having a central longitudinal axis, a body-facing side and a total width transverse to said longitudinal axis defined by a distance from an outer side edge of the body-facing side of the sanitary napkin to an opposite outer side edge of the body-facing side, said sanitary napkin comprising:

a. a liquid pervious cover sheet;

b. an absorbent means having a central longitudinal axis substantially aligned along the central longitudinal axis of said napkin, said absorbent means capable of absorbing at least 10 grams of body fluid deposited on said napkin and being sufficiently stiff to resist twisting of the sanitary napkin during use; and

c. a substantially resilient layer comprising a closed celled polyethylene foam having a width ranging from 60% to 100% of the total width of said body-facing side of the sanitary napkin and being sufficiently resilient to resist bunching as indicated by a Circular Bend Flex in the range of from 9 to about 42 grams at a rebound resiliency of about 50% and wherein said sanitary napkin has a caliper of less than about 5 mm.

21. The sanitary napkin of claim 20 wherein said absorbent means has a width less than 60% of the total width of said sanitary napkin.

22. The sanitary napkin of claim 21 wherein said napkin comprises at least a central absorbent zone and a peripheral zone, wherein said central zone is thicker in caliper and stiffer than said peripheral zone and wherein said peripheral zone is located at an outer side edge of the napkin.

23. The sanitary napkin of claim 22 further comprising an adjacent zone located between said central absorbent zone and said peripheral zone, said adjacent zone being less thick in caliper and less stiff than said central absorbent zone.

24. The sanitary napkin of claim 23 wherein said central absorbent zone has a Gurley stiffness in the range of from about 782 milligrams to about 2526 milligrams, said adjacent zone has within it a center adjacent zone, said center adjacent zone has a Gurley stiffness in the range of from about 99 mg. to about 345 mg., said center adjacent zone has a caliper in the range of from about 0.5 mm. to about 3.0 mm., and the ratio of the average stiffness of the central absorbent zone to the average stiffness of the central adjacent zone is in the range of from about 3.7:

1 to about 10.3;

1.