Stretchable elastic laminate having increased CD elongation zones and method of production
A stretchable elastic laminate including at least one nonwoven fabric layer, and at least one elastomeric material extruded as a melt onto a major surface of the nonwoven fabric to form an elastic layer bonded to the surface of the nonwoven fabric. The nonwoven fabric layer has first and second bonding zones formed on the surface thereof, which have first and second bonding strengths. The elastic layer is bonded to the surface of the nonwoven fabric such that the elastic layer forms a stronger bond with the first bonding zone on the surface of the nonwoven than the bond formed between the elastic layer and the second bonding zone on the surface of the nonwoven. The lightly bonded areas of the elastic laminate provide increased elongation in the cross direction and improved recovery after stretch, while the more strongly bonded areas provide adhesive strength. Also disclosed is a method of forming a stretchable laminate having increased elongation and improved recovery after stretch.
1. A stretchable elastic laminate comprising:
at least one spunlace nonwoven fabric that is stretchable in at least one direction, the nonwoven fabric having at least one first machine direction zone and at least one second machine direction zone, wherein the first machine direction zone is more compressed than the second machine direction zone; and
an elastic layer on a major surface of said nonwoven fabric,
wherein the at least one spunlace nonwoven fabric has a discontinuous embossed pattern along the bond between the elastic layer and the at least one spunlace nonwoven fabric, and
wherein the elastic layer is more strongly bonded to the surface of said nonwoven fabric at said first machine direction zone than at said second machine direction zone.
2. The stretchable elastic laminate of claim 1 , wherein the nonwoven fabric has a set of first machine direction zones and a set of second machine direction zones.
3. The stretchable elastic laminate of claim 2 , wherein the first machine direction zones alternate with the second machine direction zones.
4. The stretchable elastic laminate of claim 2 , wherein the second machine direction zones comprise at least 25% of the surface of the nonwoven fabric.
5. The stretchable elastic laminate of claim 2 , wherein the second machine direction zones comprise about 40% of the major surface of the nonwoven fabric.
6. The stretchable elastic laminate of claim 2 , wherein the second machine direction zones comprise about 50% of the major surface of the nonwoven fabric.
7. The stretchable elastic laminate of claim 6 , wherein the laminate further comprises a second nonwoven fabric and the elastic material is applied to a major surface of the second nonwoven fabric so that the elastic layer is sandwiched between and bonded to the major surfaces of the nonwoven fabric and the second nonwoven fabric.
8. The stretchable elastic laminate of claim 7 , wherein the second nonwoven fabric has an embossing pattern applied to a major surface of the second nonwoven fabric opposite the major surface receiving the elastic material.
9. The stretchable elastic laminate of claim 8 , wherein the embossing pattern comprises discontinuous discrete shapes having a depth of at least about 0.008 inches.
10. The stretchable elastic laminate of claim 1 , wherein the first and second zones are imparted to the nonwoven fabric by a grooved roll having a groove depth in the range of about 0.065 to about 0.250 inches.
11. The stretchable elastic laminate of claim 10 , wherein the grooved roll has a surface comprising a series of grooves alternating with a series of lands.
12. The stretchable elastic laminate of claim 11 , wherein the grooves on the surface of the roll have a width ranging from about 0.1 to about 0.5 inches.
13. The stretchable elastic laminate of claim 11 , wherein the lands on the surface of the roll have a width ranging from about 0.1 to about 0.5 inches.
14. The stretchable elastic laminate of claim 7 , wherein the nonwoven fabric is a spunlace nonwoven fabric and the second nonwoven fabric is a spunbond nonwoven fabric.
15. The embossed stretchable elastic laminate of claim 1 , wherein the laminate has a basis weight of about 68 gsm to about 128 gsm.
16. The embossed stretchable elastic laminate of claim 1 , wherein the spunlace fabric has a basis weight of about 20 to about 80 gsm and is stretchable in an amount of about 50% to about 200% of an initial length.
17. The embossed stretchable elastic laminate of claim 1 , wherein the spunlace fabric has a basis weight of about 30 gsm and is stretchable in the cross-direction.
18. The embossed stretchable elastic laminate of claim 1 , wherein the elastic melt layer and the nonwoven layer have zones of increased cross-direction elongation.
19. The embossed stretchable elastic laminate of claim 1 , wherein the elastic material is applied as a melt to the surface of the nonwoven layer.
20. The embossed stretchable elastic laminate of claim 1 , the nonwoven layer has a melting point greater than the melting point of the elastic material.
21. The embossed stretchable elastic laminate of claim 15 , wherein the laminate has a basis weight of about 118 gsm.
22. The embossed stretchable elastic laminate of claim 15 , wherein the laminate has a basis weight of about 121 gsm.
23. The embossed stretchable elastic laminate of claim 15 , wherein the laminate has a basis weight of about 126 gsm.
24. A component for an absorbent article comprising:
at least one spunlace nonwoven fabric that is stretchable in at least one direction, the nonwoven fabric having at least one first machine direction zone and at least one second machine direction zone, wherein the first machine direction zone is more compressed than the second machine direction zone; and
an elastic material applied as a melt onto a major surface of the nonwoven fabric, wherein the melt forms an elastic layer that is bonded to the major surface, and
wherein the elastic layer is more strongly bonded to the major surface at the first machine direction zone than at the second machine direction zone, wherein the at least one spunlace fabric has a basis weight of about 20 grams per square meter (gsm) to about 80 gsm and is stretchable in an amount of about 50% to about 200% of an initial length.
25. A stretchable elastic laminate comprising:
Two nonwoven fabrics that are stretchable in at least one direction, the fabrics have a basis weight of about 20 grams per square meter (gsm) to about 80 gsm and are stretchable in an amount of about 50% to about 200% of an initial length; and
an elastic material applied as a melt to a major surface of said nonwoven fabrics, wherein the melt forms an elastic layer bonded to the surface of the nonwoven fabrics; the surface of the nonwoven fabric having at least one first machine direction bonding zone having a first bonding strength and at least one second machine direction bonding zone having a second bonding strength,
wherein the elastic layer is between the two nonwoven fabrics, the bonding strength of the first bonding zone to the elastic layer is greater than the bonding strength of the second bonding zone to the elastic layer, the laminate has a basis weight of about 68 gsm to about 128 gsm, and the fabrics having a melting point that is greater than the temperature of the elastic material, and the spunlace nonwoven fabrics have a deep embossed pattern along the bond between the elastic layer and the spunlace nonwoven fabrics, wherein the engraving depth of an embossing roll is at least about 0.008 inches.