Elasticated materials having bonding patterns used with low load force elastics and stiff carrier materials
This invention relates to an elasticated materials comprising a stiff carrier material that is satisfactorily elasticated with one or more elastic strands with a low load force, due to the use of a specific bonding pattern, with specific bonding areas. The bonding areas are typically separate bonding areas positioned on separate intervals along the length direction of the carrier material, whereby each bonding area comprises one or more separate bonding zones, extending in the width (X) direction. The invention also relates to absorbent articles comprising this elasticated material and processes for making the elasticated material.
1. An absorbent article comprising:
a backsheet;
a topsheet connected with the backsheet and having longitudinally opposing first and second waist regions, the topsheet comprising a carrier material having a bending stiffness B of at least 4 μN*m to about 12 μN*m;
a void space between the topsheet and the backsheet for receiving bodily exudates;
an opening in the topsheet providing access to the void space, the opening having longitudinally extending first and second side edges;
first and second laterally opposing elasticated regions disposed adjacent respective first and second side edges of the opening, the first and second laterally opposing elasticated regions extending from the first waist region to the second waist region, wherein the first and second laterally opposing elasticated regions are parallel to each other along the first and second side edges of the opening and laterally diverge from each other in the first and second waist regions; and
wherein the first and second laterally opposing elasticated regions each comprise an elastic material having a length defined along a direction of stretch, wherein the elastic material is bonded to the carrier material in a plurality of bonding areas spaced apart from each other along the length defined along the direction of stretch of the elastic material, wherein the elastic material has an elastic load force of less than about 2.0 N at 100% extension and wherein a distance D along the length of the elastic material defined along the direction of stretch between adjacent bonding areas is at least (0.6 mm+60 N −1 *B) to about (1.2 mm+120 N −1 *B);
2. The absorbent article of claim 1 , wherein first end portions of the first and second side edges of the opening converge toward each other to define an end point of the opening in the first waist region.
3. The absorbent article of claim 1 , wherein the carrier material comprises a nonwoven web having a basis weight of at least 10 grams per m 2 .
4. The absorbent article of claim 3 , wherein the nonwoven web has a meltblown content of at least 10 grams per m 2 .
5. The absorbent article of claim 1 , wherein the elastic material has an elastic force at 100% extension in the range of about 0.3 N to about 0.8 N.
6. The absorbent article of claim 1 , wherein the elastic material is bonded to the carrier material by applying pressure to the elastic material and the carrier material in the bonding areas.
7. The absorbent article of claim 1 , wherein the elastic material is bonded to the carrier material by applying adhesive to the elastic material and the carrier material in the bonding areas.
8. The absorbent article of claim 1 , wherein each bonding area comprises at least one bonding zone defined by repeating wave-shaped bonding units having an amplitude A that is less than about (0.5 *D).
9. The absorbent article of claim 1 , wherein each bonding area comprises a single bonding zone defined by a line extending along a width of the elastic material.
10. The absorbent article of claim 1 , wherein each bonding area comprises a plurality of dot-shaped bonding zones.
11. The absorbent article of claim 1 , wherein the elastic material comprises at least one elastic strand.
12. An absorbent article comprising:
a backsheet;
a topsheet connected with the backsheet and having longitudinally opposing first and second waist regions, the topsheet comprising a carrier material having a meltblown content M of at least about 5 grams per m 2 to about 15 grams per m 2 ;
a void space between the topsheet and the backsheet for receiving bodily exudates;
an opening in the topsheet providing access to the void space, the opening having longitudinally extending first and second side edges;
first and second laterally opposing elasticated regions disposed adjacent respective first and second side edges of the opening, the first and second laterally opposing elasticated regions extending from the first waist region to the second waist region, wherein the first and second laterally opposing elasticated regions are parallel to each other the along the first and second side edges of the opening and laterally diverge from each other in the first and second waist regions; and
wherein the first and second laterally opposing elasticated regions each comprise an elastic material having a length defined along a direction of stretch, wherein the elastic material is bonded to the carrier material in a plurality of bonding areas spaced apart from each other along the length defined along the direction of stretch of the elastic material, wherein the elastic material has an elastic load force of less than about 2.0 N at 100% extension and wherein a distance D along the length of the elastic material defined along the direction of stretch between adjacent bonding areas is at least 0.6 mm+M*0.01*(mm*m 2 /g)+M 2* 0.005* mm * (m 2 /g) 2 ) to about (1.2 mm +M*0.02*(m*m 2 /g)+M 2 *0.01* (m 2 /g) 2 ).
13. The absorbent article of claim 12 , wherein first end portions of the first and second side edges of the opening converge toward each other to define an end point of the opening in the first waist region.
14. The absorbent article of claim 12 , wherein the elastic material has an elastic force at 100% extension in the range of about 0.3 N to about 0.8 N.
15. The absorbent article of claim 12 , wherein the elastic material is bonded to the carrier material by applying adhesive to the elastic material and the carrier material in the bonding areas.
16. The absorbent article of claim 12 , wherein each bonding area comprises at least one bonding zone defined by repeating wave-shaped bonding units having an amplitude A that is less than about (0.5*D).