Absorbent article comprising an elastic web material

Patent metadata

Field	Value
Publication number	US-9271880-B2
Application number	US-57649708-A
Country	US
Kind code	B2
Filing date	Oct 4, 2004
Priority date	Oct 4, 2004
Publication date	Mar 1, 2016
Grant date	Mar 1, 2016

Abstract

A pant type absorbent article such as a pant diaper, a sanitary pant or incontinence pant, said article having a core region ( 3 ) comprising an absorbent core ( 2 ) and a chassis region ( 4 ) surrounding the core region. The chassis comprises front, back and waist regions ( 5, 6 and 7 ). The article in at least a part of the chassis region ( 4 ) comprises an outer coversheet ( 10 ) in the form of an elastic web material ( 11 ) constituting the sole component of the chassis ( 4 ) in at least 20% of the total surface area of the article ( 1 ), said elastic laminate having an opacity of at least 40% and a basis weight of no more than 100 g/m 2 .

First claim

The invention claimed is:

1. A pant type absorbent article, said article comprising a core region with an absorbent core and a chassis surrounding the core region, said chassis comprising front, back and waist regions, while the core region is located at least in a crotch portion of the article, a liquid impermeable backsheet is arranged at least in the core region on the garment-facing side of the absorbent core and a liquid permeable topsheet is arranged at least in the core region on the wearer-facing side of the absorbent core, said article having a longitudinal and a transverse direction,
wherein said article in at least a part of the chassis region comprises an outer coversheet in the form of an elastic web material constituting the sole component of the chassis in at least 20% of the total surface area of the article, said elastic web material having an opacity of at least 40% and a basis weight of no more than 100 g/m 2 ,
wherein the elastic web material is a laminate composed of first and second layers of fibrous material and an elastic film layer located between said first and second fibrous layers, and
wherein at least one of the layers of fibrous material has an elongation at maximum load greater than the elasticity of the elastic laminate.

2. The absorbent article as claimed in claim 1 , said elastic web material has an opacity of at least 50%.

3. The absorbent article as claimed in claim 1 , wherein said elastic film layer contains an opacifying filler.

4. The absorbent article as claimed in claim 3 , wherein the opacifying filler is selected from the group consisting of organic and inorganic dyes, colouring agents and whitening agents.

5. The absorbent article as claimed in claim 3 , wherein the opacifying filler is selected from the group consisting of titanium dioxide, inorganic carbonates, synthetic carbonates, talc, nepheline syenite, magnesium hydroxide, aluminum trihydrate diatomaceous earth, mica, natural or synthetic silicas, calcinated clays and mixtures thereof.

6. The absorbent article as claimed in claim 1 , wherein both layers of fibrous material have an elongation at maximum load greater than the elasticity of the elastic laminate.

7. The absorbent article as claimed in claim 1 , wherein at least one of the layers of fibrous material have an elongation at maximum load of at least 10% greater than the elasticity of the elastic laminate.

8. The absorbent article as claimed in claim 1 , wherein said elastic film layer is breathable.

9. The absorbent article as claimed in claim 8 , wherein said elastic laminate has a Water Vapour Transmission Rate according to ASTM E96-00 Procedure D of at least 1500 g/m 2 24 h.

10. The absorbent article as claimed in claim 8 , wherein the elastic film layer has an open area of at least 5%.

11. The absorbent article as claimed in claim 1 , wherein the first and/or the second layers of fibrous material comprise a mixture of polypropylene and polyethylene polymers.

12. The absorbent article as claimed in claim 1 , wherein said elastic laminate comprises first and second fibrous layers of spunbond material, each having a basis weight of between 10 and 35 g/m 2 , and a breathable elastic film layer having a basis weight between 20 and 80 g/m 2 , said elastic laminate having a Water Vapour Transmission Rate according to ASTM E96-00 Procedure D of at least 1500 g/m 2 24 h.

13. The absorbent article as claimed in claim 1 , wherein the elastic web material has a basis weight of no more than 90 g/m 2 .

14. The absorbent article as claimed in claim 1 , wherein the elastic web material has an opacity (%)/basis weight (g/m 2 ) ratio of at least 0.4.

15. The absorbent article as claimed in claim 1 , wherein the elastic web material constitutes the sole component of the chassis in at least 25% of the total surface area of the article.

16. The absorbent article as claimed in claim 1 , wherein said elastic web material has an elasticity in the transverse direction of the article of at least 30% when measured according to the elasticity test specified in the description.

17. The absorbent article as claimed in claim 16 , wherein the elastic web material has an elasticity in the longitudinal direction of the article of at least 20% when measured according to the elasticity test specified in the description.

18. The absorbent article as claimed in claim 1 , wherein said elastic web material has Softness (S) according to Kawabata of at least 20.

19. The absorbent article as claimed in claim 1 , wherein said elastic web material has a Formability (F) according to Kawabata of no more than 50.

20. The absorbent article as claimed in claim 1 , wherein said elastic web material has a Drapability (D) according to Kawabata of no more than 40.

21. The absorbent article as claimed in claim 1 , wherein a part of the crotch portion of the article is free from said elastic web material.

22. The absorbent article as claimed in claim 1 , wherein the waist region of the chassis is free from said elastic web material.

23. The absorbent article as claimed in claim 1 , wherein the surface area of the absorbent core amounts to no more than 30% of the total surface area of the article, as measured in a flat state of the article.

24. The absorbent article as claimed in claim 1 , wherein the article is a pull-up pant product comprising an elasticized waist region, which is free from said elastic web material, a crotch portion which is also free from said elastic web material and wherein the elastic web material is arranged as a sole component of the chassis in at least a substantial part of the front region of the article, which in use is intended to be applied over the stomach of the wearer.

25. The absorbent article as claimed in claim 1 , wherein at least one of the layers of fibrous material have an elongation at maximum load of at least 20% greater than the elasticity of the elastic laminate.

26. The absorbent article as claimed in claim 8 , wherein said elastic laminate has a Water Vapour Transmission Rate according to ASTM E96-00 Procedure D of at least 3000 g/m 2 24 h.

27. The absorbent article as claimed in claim 8 , wherein the elastic film layer has an open area of at least 8%.

28. The absorbent article as claimed in claim 1 , wherein said elastic laminate comprises first and second fibrous layers of spunbond material, each having a basis weight of between 15 and 25 g/m 2 , and a breathable elastic film layer having a basis weight between 20 and 60 g/m 2 , said elastic laminate having a Water Vapour Transmission Rate according to ASTM E96-00 Procedure D of at least 3000 g/m 2 24 h.

29. The absorbent article as claimed in claim 1 , wherein the elastic web material has an opacity (%)/basis weight (g/m 2 ) ratio of at least 0.6.

30. The absorbent article as claimed in claim 1 , the elastic web material constitutes the sole component of the chassis in at least 40% of the total surface area of the article.

31. The absorbent article as claimed in claim 1 , said elastic web material has an elasticity in the transverse direction of the article of at least 70% when measured according to the elasticity test specified in the description.

32. The absorbent article as claimed in claim 1 , wherein said elastic web material has Softness (S) according to Kawabata of at leas

Assignees

• Karlson Tomas
• Gustafsson Anders
• Widlund Urban
• Wastlund-Karlsson Jan
• Wennerback Margareta
• Sca Hygiene Prod Ab

Inventors

• Karlson Tomas
• Gustafsson Anders
• Widlund Urban
• Wastlund-Karlsson Jan
• Wennerback Margareta

Classifications

• A61F13/51462

  being defined by a value or parameter · CPC title

• A61F13/5146

  having apertures of perforations · CPC title

• A61F13/51464 Primary

  being stretchable or elastomeric · CPC title

• A61F13/51484

  being inhomogeneous in the plane of the sheet, i.e. having zones of different properties or structures · CPC title

• A61F13/51401

  characterised by the material · CPC title