Absorbent article and method of production
View Patent ↗An absorbent article having a first liquid permeable surface layer, a essentially liquid impermeable backing layer and, located between said liquid permeable surface layer and said liquid impermeable backing layer, an absorbent body having at least one layer. The absorbent article has cavities which are essentially cone-shaped and extend at least through part of the absorbent body, said cavities having a tip part and a base, the tip part being located towards or in the liquid permeable surface layer and the base being located away from the liquid permeable surface layer. A method of production of an absorbent article with cone-shaped cavities is also provided.
1. An absorbent article comprising:
a first liquid permeable surface layer;
a substantially liquid impermeable backing layer; and
an absorbent body located between the liquid permeable surface layer and the substantially liquid impermeable backing layer, the absorbent body including at least one layer,
wherein the absorbent article includes at least one cavity which is substantially cone-shaped and extends at least through part of the absorbent body, the cavity having a tip part and a base, the tip part being located toward or in the liquid permeable surface layer and the base being located away from the liquid permeable surface layer, wherein the smallest cross section of the cavity is located closer to the liquid permeable surface layer than is the largest cross section of the cavity.
2. The absorbent article according to claim 1 , wherein the at least one cavity extends through the whole of the absorbent body.
3. The absorbent article according to claim 1 , wherein the absorbent body has a plurality of cavities in specific zones.
4. The absorbent article according to claim 1 , wherein the absorbent body has a plurality of cavities of different sizes.
5. The absorbent article according to claim 1 , wherein an envelope surface of the at least one cavity is formed entirely or partly from the backing layer.
6. The absorbent article according to claim 5 , wherein the envelope surface of the cavities is at least partly hydrophobic.
7. The absorbent article according to claim 1 , wherein an envelope surface of the at least one cavity is formed entirely or partly of a separate layer located between the absorbent body and the substantially liquid impermeable backing layer.
8. The absorbent article according to claim 7 , wherein the envelope surface of the cavities is at least partly hydrophobic.
9. The absorbent article according to claim 1 , wherein an envelope surface of the at least one cavity is formed entirely or partly of a plastic film located between the absorbent body and the substantially liquid impermeable backing layer.
10. The absorbent article according to claim 9 , wherein the envelope surface of the cavities is at least partly hydrophobic.
11. The absorbent article according to claim 1 , wherein the backing layer includes one or more agents selected from the group consisting of pH control agent, a hydrophobic agent to provide a less hydrophobic surface of a hydrophilic surface, and an odor inhibition agent.
12. The absorbent article according to claim 1 , wherein the backing layer includes one or more indicating agents to indicate a parameter selected from the group consisting of temperature, moisture content, pH, and enzyme activity.
13. The absorbent article according to claim 1 , wherein the backing layer includes a bacteria.
14. The absorbent article according to claim 13 , wherein the bacteria is lactobacteria.
15. The absorbent article according to claim 1 , wherein the at least one cavity has a height of 0.5-30 mm and a base area of 0.19-79 mm 2 .
16. The absorbent article according to claim 15 , wherein the height is 0.5-5 mm.
17. The absorbent article according to claim 15 , wherein the base area is 0.19-40 mm 2 .
18. The absorbent article according to claim 17 , wherein the base area is 0.19-4 mm 2 .
19. The absorbent article according to claim 1 , wherein a volume of the at least one cavity is described by rotating a first function Y=f(X) around the X axis in an X-Y diagram, the volume V being obtained by the formula:
V
=
∫
a
b
π
·
Y
2
·
ⅆ
X
=
π
∫
a
b
f
2
(
X
)
·
ⅆ
X
,
where
a
<
b
wherein the first function Y=f(X) has a value for Y of ≦Y (kX+m) in a first interval X=a and X=b, and Y>m in a second interval X=a and X=b, where a defines the tip part and b the base of the cavity, and
wherein Y=(kX+m) is an equation of a straight line, where k is an inclination of the straight line and m is an intersection of the straight line with the Y axis when X=0.
20. The absorbent article according to claim 1 wherein the at least one cavity is spaced from an outer surface of the liquid permeable surface layer.