Disposable absorbent articles having cuffs of improved stretch laminate structure
An absorbent article having longitudinal cuffs of improved structure is disclosed. The improved cuffs may be elasticized by a plurality of elastic strands that are substantially greater in number, closer in spacing, lower in pre-strain, and lower in decitex, or any combination of these, as compared with those in conventional articles. This combination of features results in ruffles or gathers of cuff material joined to the elastic strands that are substantially greater in machine-direction frequency and substantially lesser in z-direction amplitude, than those in conventional articles. As a result, the cuff structure lies more closely and evenly against the wearer's skin, has an improved, more cloth-like appearance, provides improved gasketing, and provides improved wearer comfort, as compared with cuff structures in conventional articles. A method for manufacturing articles with such cuff structures, utilizing a warp beam as a supply mechanism, is also disclosed.
1. A disposable absorbent article in the form of a diaper or absorbent pant, comprising a central chassis structure having a longitudinal axis, front and rear end edges and left and right side edges, and comprising:
a liquid permeable topsheet, a liquid impermeable backsheet and an absorbent core disposed between the topsheet and the backsheet;
left and right longitudinal barrier cuffs disposed respectively proximate the left and right side edges, each barrier cuff having a base portion joining to one or both of the topsheet and backsheet, a longitudinally-oriented, barrier cuff free edge, and a longitudinally elasticized band portion proximate the barrier cuff free edge, the elasticized band portion comprising:
a first plurality of at least 25 laterally-spaced elastic strands, the strands having an Average Decitex no greater than 300 decitex, with lateral Average-Strand-Spacing no greater than 3.0 mm;
the first plurality of elastic strands being joined with at least a first layer of nonwoven web material;
the first plurality of elastic strands having an Average-Pre-Strain no greater than 250 percent; and
wherein the first plurality of elastic strands is disposed between the first layer of nonwoven web material and a second layer of nonwoven web material and wherein the first and second layers of nonwoven web material are adhered together by adhesive.
2. The article of claim 1 wherein the second layer is a folded-over portion of the first layer of nonwoven web material.
3. The article of claim 1 wherein the pre-strain level of the strands is substantially uniform across a width of the elasticized first band portion.
4. The article of claim 1 wherein the elasticized first band portion has a width of 5 mm to 30 mm.
5. The article of claim 1 wherein some or all of the elastic strands are held in position laterally by adhesive.
6. The article of claim 1 wherein the first and second layers of nonwoven material are adhered together by mechanical bonds.
7. The article of claim 1 wherein the first layer of nonwoven web material comprises meltblown fibers or nanofibers.
8. The article of claim 1 , wherein the first plurality of elastic strands are free from mechanical bonds.
9. A disposable absorbent article in the form of a diaper or absorbent pant, comprising a central chassis structure having a longitudinal axis, front and rear end edges and left and right side edges, and comprising:
a liquid permeable topsheet, a liquid impermeable backsheet and an absorbent core disposed between the topsheet and the backsheet;
left and right longitudinal barrier cuffs disposed respectively proximate the left and right side edges, each barrier cuff having a base portion joining to one or both of the topsheet and backsheet, a longitudinally-oriented, barrier cuff free edge, and a longitudinally elasticized first band portion proximate the barrier cuff free edge, the elasticized first band portion comprising:
a first plurality of at least 25 laterally-spaced beamed elastic strands, the stands having an Average Decitex no greater than 300 decitex, and an Average Strand Spacing no greater than 3.0 mm;
the first plurality of elastic strands being joined with at least a first layer of nonwoven web material; and
the first plurality of elastic strands having an Average Pre-Strain no greater than 250 percent; and
left and right outer leg cuffs disposed respectively proximate the left and right side edges, each leg cuff having a proximal portion joining one or both of the topsheet and backsheet, a longitudinally-oriented, free distal edge, and a longitudinally elasticized second band portion proximate the free distal edge, the elasticized second band portion comprising:
a second plurality of laterally-spaced elastic strands, the strands having an Average Decitex no greater than 300 decitex, with lateral Average Spacing no greater than 3.0 mm;
the second plurality of elastic strands having an Average-Pre-Strain no greater than 250 percent,
the second plurality of elastic strands being disposed between first and second layers of web material forming at least a portion of the leg cuff; and
wherein the first plurality of elastic strands is disposed between the first layer of nonwoven web material and a second layer of nonwoven web material and wherein the first and second layers of nonwoven web material of the first band portion are adhered together by adhesive.
10. The article of claim 9 wherein the second layer of the first band portion is a folded-over portion of the first layer of nonwoven web material.
11. The article of claim 9 wherein the pre-strain level of the strands is substantially uniform across a width of the elasticized first band portion.
12. The article of claim 9 wherein the elasticized first band portion has a width of 5 mm to 30 mm.
13. The article of claim 9 wherein some or all of the elastic strands of the first band portion are held in position laterally by adhesive.
14. The article of claim 9 wherein the first and second layers of nonwoven web material of the first band portion are adhered together by mechanical bonds.
15. The article of claim 9 wherein the first layer of nonwoven web material of the first band portion comprises meltblown fibers or nanofibers.
16. The article of claim 9 , wherein the first plurality of elastic strands are free from mechanical bonds.
17. A method for manufacturing the disposable absorbent article of claim 9 , comprising the step of unwinding all of the first plurality of elastic strands, or all of a sub-plurality thereof, simultaneously from a single warp beam, and incorporating them into a stretch laminate.
18. A disposable absorbent article in the form of a diaper or absorbent pant, comprising a central chassis structure having a longitudinal axis, front and rear end edges and left and right side edges, and comprising:
a liquid permeable topsheet, a liquid impermeable backsheet and an absorbent core disposed between the topsheet and the backsheet;
left and right longitudinal barrier cuffs disposed respectively proximate the left and right side edges, each barrier cuff having a base portion joining to one or both of the topsheet and backsheet, a longitudinally-oriented, barrier cuff free edge, and a longitudinally elasticized band portion proximate the barrier cuff free edge, the elasticized band portion comprising:
a first plurality of at least 25 laterally-spaced elastic strands, the strands having an Average Decitex no greater than 300 decitex, with lateral Average-Strand-Spacing no greater than 3.0 mm;
the first plurality of elastic strands being joined with at least a first layer of nonwoven web material;
the first plurality of elastic strands having an Average-Pre-Strain no greater than 250 percent; and
wherein the first plurality of elastic strands is disposed between the first layer of nonwoven web material and a second layer of nonwoven web material and wherein some or all of the elastic strands are held in position laterally by adhesive.
19. The article of claim 18 wherein the second layer is a folded-over portion of the first layer of nonwoven web material.
20. The article of claim 18 wherein the pre-strain level of the strands is substantially uniform across a width of the elasticized first band portion.
21. The article of claim 18 wherein the elasticized first band portion has a width of 5 mm to 30 mm.
22. The article of claim 18 wherein some or all of the elastic strands are held in position laterally by adhesive.
23. The article of claim 18 wherein the first and second layers of nonwoven material are adhered together by mechanical bonds.
24. The article of claim 18 wherein the first layer of nonwoven web material comprises meltblown fibers or nanofibers.
25. The article of claim 18 , wherein the first plurality of elastic strands are free from mechanical bonds.
26. A disposable absorbent article in the form of a diaper or absorbent pant, comprising a central chassis structure having a longitudinal axis, front and rear end edges and left and right side edges, and comprising:
a liquid permeable topsheet, a liquid impermeable backsheet and an absorbent core disposed between the topsheet and the backsheet;
left and right longitudinal barrier cuffs disposed respectively proximate the left and right side edges, each barrier cuff having a base portion joining to one or both of the topsheet and backsheet, a longitudinally-oriented, barrier cuff free edge, and a longitudinally elasticized first band portion proximate the barrier cuff free edge, the elasticized first band portion comprising:
a first plurality of at least 25 laterally-spaced beamed elastic strands, the strands having an Average Decitex no greater than 300 decitex, and an Average Strand Spacing no greater than 3.0 mm;
the first plurality of elastic strands being joined with at least a first layer of nonwoven web material; and
the first plurality of elastic strands having an Average Pre-Strain no greater than 250 percent; and
left and right outer leg cuffs disposed respectively proximate the left and right side edges, each leg cuff having a proximal portion joining one or both of the topsheet and backsheet, a longitudinally-oriented, free distal edge, and a longitudinally elasticized second band portion proximate the free distal edge, the elasticized second band portion comprising:
a second plurality of laterally-spaced elastic strands, the strands having an Average Decitex no greater than 300 decitex, with lateral Average Spacing no greater than 3.0 mm;
the second plurality of elastic strands having an Average-Pre-Strain no greater than 250 percent,
the second plurality of elastic strands being disposed between first and second layers of web material forming at least a portion of the leg cuff; and
wherein the first plurality of elastic strands is disposed between the first layer of nonwoven web material and a second layer of nonwoven web material and wherein some or all of the elastic strands of the first band portion are held in position laterally by adhesive.
27. The article of claim 26 wherein the second layer of the first band portion is a folded-over portion of the first layer of nonwoven web material.
28. The article of claim 26 wherein the pre-strain level of the strands is substantially uniform across a width of the elasticized first band portion.
29. The article of claim 26 wherein the elasticized first band portion has a width of 5 mm to 30 mm.
30. The article of claim 26 wherein some or all of the elastic strands of the first band portion are held in position laterally by adhesive.
31. The article of claim 26 wherein the first and second layers of nonwoven web material of the first band portion are adhered together by mechanical bonds.
32. The article of claim 26 wherein the first layer of nonwoven web material of the first band portion comprises meltblown fibers or nanofibers.
33. The article of claim 26 wherein the first plurality of elastic strands are free from mechanical bonds.