Activated composite web for absorptive devices
An activated composite web includes a nonwoven layer, and a formed film layer attached to the nonwoven layer. The formed film layer includes a plurality of first apertured protuberances having a mesh count of at least 35, and a plurality of second apertured protuberances. Each of the second apertured protuberances has a cross-sectional area larger than each of the first apertured protuberances. A plurality of first lanes are aligned in a first direction and have a first width extending in a second direction substantially perpendicular to the first direction. The first apertured protuberances are located in the first lanes. A plurality of second lanes are aligned in the first direction and have a second width, less than the first width, extending in the second direction. The first lanes and the second lanes alternate with each other in the second direction. The second apertured protuberances are located in the second lanes.
1. An activated composite web, comprising a composite web having:
a nonwoven layer; and
a three-dimensionally formed film layer attached to the nonwoven layer, the formed film layer comprising a plurality of apertured protuberances having a mesh count of at least 35;
wherein the composite web is activated by stretching with intermeshing elements to form the activated composite web comprising:
a plurality of first lanes substantially unaffected by activation aligned in a first direction and having a first width in a second direction substantially perpendicular to the first direction, wherein a first portion of the plurality of apertured protuberances forms a plurality of first apertured protuberances having a plurality of corresponding first apertures with first cross-sectional areas, the first apertured protuberances located in the first lanes; and
a plurality of second lanes aligned in a first direction and having a second width less than the first width in the second direction, the first lanes and second lanes alternating with each other in the second direction, wherein a second portion of the plurality of apertured protuberances forms a plurality of second apertured protuberances having a plurality of corresponding second apertures with second cross-sectional areas, each of the second cross-sectional areas being larger than each of the first cross-sectional areas, the second apertured protuberances located in the second lanes,
wherein each of the first apertures has a first major axis and a first minor axis with the first major axis being substantially aligned in the first direction, each of the second apertures has a second major axis and a second minor axis with the second major axis substantially aligned in the second direction.
2. The activated composite web according to claim 1 , wherein the first top surfaces of the first lanes lie in a first plane and a second top surfaces of the second lanes lie in at least one second plane, different from the first plane.
3. The activated composite web according to claim 1 , wherein the activated composite web has a basis weight less than the sum of the basis weights of its original components of nonwoven and formed film layers before activation.
4. The activated composite web according to claim 3 , wherein the basis weight of the activated composite web is at least 15% less.
5. The activated composite web according to claim 1 , wherein the formed film layer is oriented so that the first apertured protuberances and the second apertured protuberances extend away from the nonwoven layer.
6. The activated composite web according to claim 1 , wherein the nonwoven layer comprises a spun bond nonwoven material having a pattern of press-melted sites.
7. The activated composite web according to claim 6 , wherein the nonwoven layer comprises a plurality of openings located at the press-melted sites.
8. The activated composite web according to claim 6 , wherein the nonwoven layer comprises a plurality of soft broken fiber ends extending away from the formed film layer.
9. The activated composite web according to claim 1 , wherein the activated composite web is a vacuum formed laminate.
10. The activated composite web according to claim 1 , wherein the first direction is the machine direction.
11. The activated composite web according to claim 1 , wherein portions of the second activated lanes are not straight.
12. The activated composite web according to claim 11 , wherein portions of the second activated lanes are wavy.
13. The activated composite web according to claim 1 , wherein the cross-sectional areas of the second apertured protuberances are at least 150% greater than the cross-sectional areas of the first apertured protuberances.
14. The activated composite web according to claim 1 , wherein the activated composite web has a strikethrough time of less than or equal to about 2.45 seconds.
15. The activated composite web according to claim 1 , wherein the activated composite web is a topsheet in an absorptive device.
16. The activated composite web according to claim 1 , wherein the activated composite web is an acquisition distribution layer in an absorptive device.
17. A method of manufacturing an activated composite web, comprising:
laminating a three-dimensionally formed film layer comprising a plurality of apertured protuberances having a mesh count of at least 35 to a nonwoven web to form a composite web; and
passing the composite web through intermeshing gears to form an activated composite web, the intermeshing gears being constructed and arranged to form a plurality of first lanes substantially unaffected by activation aligned in a first direction and having a first width in a second direction substantially perpendicular to the first direction and a plurality of second lanes aligned in a first direction and having a second width less than the first width in the second direction in the activated composite web, the first width being greater than the second width, wherein a first portion of the plurality of apertured protuberances forms a plurality of first apertured protuberances having a plurality of corresponding first apertures with first cross-sectional areas, the first apertured protuberances are located in the first lanes, and a second portion of the plurality of apertured protuberances forms a plurality of second apertured protuberances having a plurality of corresponding second apertures with second cross-sectional areas, each of the second cross-sectional areas being larger than each of the first cross-sectional areas, the second apertured protuberances are located in the second lanes, and
wherein each of the first apertures has a first major axis and a first minor axis with the first major axis being substantially aligned in the first direction, each of the second apertures has a second major axis and a second minor axis with the second major axis substantially aligned in the second direction.
18. The method according to claim 17 , wherein the first cross-sectional areas are substantially the same before and after activation.
19. The method according to claim 17 , wherein the laminating comprises extruding a polymer melt curtain onto a vacuum forming cylinder while introducing the nonwoven web onto a laminating roller so that the nonwoven web contacts the polymer melt curtain at an impingement point between the vacuum forming cylinder and the laminating roller.
20. The method according to claim 19 , wherein the apertured protuberances in the formed film layer are formed with the vacuum forming cylinder.
21. The method according to claim 20 , wherein the vacuum forming cylinder comprises a forming screen having a pattern of apertures.
22. The method according to claim 17 , wherein the nonwoven web has an initial basis weight of about 10 gsm.
23. The method according to claim 22 , wherein the formed film layer has an initial basis weight of about 12 gsm.
24. The method according to claim 23 , wherein the activated composite web has a basis weight of less than about 19 gsm.
25. The method according to claim 17 , wherein the activated composite web has a basis weight of at least 15% less than the combined basis weights of the formed film and the nonwoven web before activation.