Absorbent core wrap with a low basis weight nonwoven in the bottom layer

Patent metadata

Field	Value
Publication number	US-10857255-B2
Application number	US-201815907374-A
Country	US
Kind code	B2
Filing date	Feb 28, 2018
Priority date	Mar 9, 2017
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

An absorbent article includes an absorbent core having an absorbent material enclosed in a core wrap having a top layer and a bottom layer. The bottom layer of the core wrap comprises a nonwoven comprising synthetic fibers, which has a basis weight from about 6 g/m2 to about 10 g/m2 and the nonwoven has a static coefficient of friction as measured in cross-machine direction of no more than 0.40.

First claim

What is claimed is:

1. An absorbent article comprising:
a liquid permeable topsheet;
a liquid impermeable backsheet; and
an absorbent core at least partially between the topsheet and the backsheet,
wherein the absorbent core comprises an absorbent material enclosed in a core wrap comprising a top layer and a bottom layer, wherein the top layer comprises a surfactant to increase hydrophilicity of the top layer, wherein the bottom layer of the core wrap comprises a nonwoven comprising synthetic fibers, wherein the nonwoven has a basis weight from about 6 g/m 2 to about 10 g/m 2 , wherein the fibers of the nonwoven comprise a slip agent that reduces a static coefficient of friction of the nonwoven, and wherein the static coefficient of friction of the nonwoven matches a static coefficient of friction of the top layer.

2. The absorbent article according to claim 1 , wherein the slip agent is a melt additive.

3. The absorbent article according to claim 2 , wherein the melt additive is a fatty acid amide.

4. The absorbent article according to claim 3 , wherein the fatty acid amide is selected from Oleamide, Erucamide, Stearamide and mixtures thereof.

5. The absorbent article according to claim 3 , wherein the nonwoven comprises more than 0.05% of the fatty acid amide, by weight of the nonwoven.

6. The absorbent article according to claim 5 , wherein the nonwoven comprises more than 0.1% of the fatty acid amide, by weight of the nonwoven.

7. The absorbent article according to claim 3 , wherein the nonwoven comprises less than 1% of the fatty acid amide, by weight of the nonwoven.

8. The absorbent article according claim 7 , wherein the nonwoven comprises up to 0.6% of the fatty acid amide, by weight of the nonwoven.

9. The absorbent article according to claim 3 , wherein the nonwoven is a multilayer nonwoven comprising at least one spunbond layer and at least one meltblown layer, and wherein the spunbond layer comprises the fatty acid amide.

10. The absorbent article according to claim 9 , wherein the nonwoven is a SMS or SMMS nonwoven.

11. The absorbent article according to claim 1 , wherein the nonwoven comprises from about 0.2% to about 0.5% of erucamide, by weight of the nonwoven.

12. The absorbent article according to claim 1 , wherein the top layer of the core wrap is a second nonwoven having a second basis weight from about 6 g/m 2 to about 10 g/m 2 .

13. A process for making an absorbent core, wherein the process comprises:
adding a melt additive to a plastic melt, wherein the melt additive is a coefficient of friction reduction agent;
making a nonwoven comprising fibers from the plastic melt;
converting the nonwoven in a continuous process on a converting line into a portion of the absorbent core, wherein the nonwoven is used to form a bottom layer of a core wrap of the absorbent core, the absorbent core comprising an absorbent material and a top layer, the top layer and the bottom layer forming the core wrap around the absorbent material; and
treating the top layer with a surfactant to increase a hydrophilicity of the top layer and such that a static coefficient of friction of the nonwoven matches a static coefficient of friction of the top layer.

14. The process according to claim 13 , comprising:
heat treating the nonwoven so that diffusion of the melt additive at a surface of the fibers of the nonwoven is accelerated and the coefficient of friction is further reduced.

15. An absorbent article having a wearer-facing surface, the absorbent article comprising:
a liquid permeable topsheet;
a liquid impermeable backsheet; and
an absorbent core at least partially between the topsheet and the backsheet,
wherein the absorbent core comprises an absorbent material enclosed in a core wrap comprising a first layer and a second layer, wherein the first layer is positioned more proximate to the wearer-facing surface than the second layer, wherein the second layer of the core wrap comprises a nonwoven comprising synthetic fibers, wherein the nonwoven has a basis weight from about 6 g/m 2 to about 10 g/m 2 , wherein the first layer and the nonwoven have a static coefficient of friction as measured in cross-machine direction of no more than 0.40, as measured according to ASTM D1894-01, and wherein at least some of the fibers of the nonwoven comprise a slip agent that reduces the static coefficient of friction of the nonwoven.

16. The absorbent article according to claim 15 , wherein the slip agent is a melt additive.

17. The absorbent article according to claim 16 , wherein the nonwoven is a SMS or SMMS nonwoven.

18. The absorbent article according to claim 17 , wherein the first layer of the core wrap is a second nonwoven having a basis weight from about 6 g/m 2 to about 10 g/m 2 and comprises a surfactant to increase its hydrophilicity.

Assignees

• Procter & Gamble

Inventors

• Flöter Stefan
• Gratzel Geeske
• Lindner Torsten

Classifications

• A61F13/53704 Primary

  the layer having an inhibiting function on liquid propagation · CPC title

• A61F13/15674

  by wrapping webs or pads between webs moving in their longitudinal direction · CPC title

• A61F13/53756

  the layer facing the back-sheet · CPC title

• D04H5/00

  Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length · CPC title

• A61F2013/5315

  with a tissue-wrapped core · CPC title