Methods of making laminates for absorbent articles

Patent metadata

Field	Value
Publication number	US-10695233-B2
Application number	US-201313893735-A
Country	US
Kind code	B2
Filing date	May 14, 2013
Priority date	May 15, 2012
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

A method of making a laminate for an absorbent article is provided. The laminate comprises elastic elements disposed at least partially intermediate two substrates. The first substrate has a primary fiber bond pattern formed therein and comprising a plurality of primary fiber bonds. The method comprises forming densified regions in the first substrate. A perimeter of each of the densified regions is larger than a perimeter of each of the primary fiber bonds. The densified regions together form a pattern of densified regions in the first substrate. The method comprises adhesively attaching the elastic elements to the first substrate, joining the second substrate to the first substrate or to some of the elastic elements, and forming a plurality of rugosities in the first substrate by allowing the elastic elements to at least partially contract. The frequency and amplitude ranges of the rugosities result from the pattern of the densified regions.

First claim

What is claimed is:

1. A method of making a laminate configured to form a portion of an absorbent article, wherein the laminate comprises a plurality of elastic elements disposed at least partially intermediate a first substrate and a second substrate, and wherein the first substrate has a primary fiber bond pattern formed therein that comprises a plurality of primary fiber bonds, the method comprising:
forming densified regions in the first substrate, wherein a perimeter of each of the densified regions is larger than a perimeter of each of the primary fiber bonds, and wherein the densified regions together form a pattern of densified regions in the first substrate;
adhesively attaching the elastic elements to portions of the first substrate;
joining the second substrate to the first substrate or to some of the elastic elements; and
forming a plurality of nested rugosities in the first and second substrates by allowing the elastic elements to at least partially contract, wherein frequency and amplitude ranges of the nested rugosities result from the pattern of the densified regions.

2. The method of claim 1 , wherein the first and second substrates comprise nonwoven materials.

3. The method of claim 1 , wherein the second substrate has a second primary fiber bond pattern comprising a plurality of primary fiber bonds formed therein, the method comprising:
forming densified regions in the second substrate, wherein a perimeter of each of the densified regions in the second substrate is larger than a perimeter of each of the primary fiber bonds in the second substrate, and wherein the densified regions together form a second pattern of densified regions in the second substrate; and
forming the plurality of the nested rugosities in the first and second substrates by allowing the elastic elements to at least partially contract, wherein frequency and amplitude ranges of the nested rugosities result from the second pattern of the densified regions.

4. The method of claim 3 , wherein the pattern of densified regions in the first substrate is the same as the second pattern of densified regions in the second substrate.

5. The method of claim 1 , comprising:
applying a patterned adhesive to the first substrate; and
attaching the elastic elements to the portion of the first substrate using the patterned adhesive.

6. The method of claim 1 , comprising forming the densified regions in the first substrate by any of calendering, embossing, mechanical deformation, and thermal bonding.

7. The method of claim 1 , wherein a perimeter of each of the densified regions is greater than 2 mm.

8. The method of claim 1 , wherein an aspect ratio of each of the densified regions is greater than 5.

9. The method of claim 1 , comprising adhesively attaching the elastic elements to the portion of the first substrate in a direction transverse to a direction of extension of the longest dimension of the densified regions.

10. A method of making a laminate for an absorbent article, wherein the laminate comprises a plurality of elastic elements disposed at least partially intermediate first and second nonwoven substrates, and wherein the first and second nonwoven substrates each have primary fiber bond patterns formed therein, each primary fiber bond pattern comprising a plurality of primary fiber bonds, the method comprising:
forming a pattern of first densified regions in the first substrate, wherein a perimeter of each of the first densified regions is larger than a perimeter of each of the primary fiber bonds in the first substrate;
forming a pattern of second densified regions in the second substrate, wherein a perimeter of each of the second densified regions is larger than a perimeter of each of the primary fiber bonds in the second substrate;
applying a patterned adhesive to one of the substrates;
attaching the elastic elements, in a prestrained state, to one of the substrates using the patterned adhesive, wherein the elastic elements are attached to the one of the substrates in areas of the one of the substrates that are free of the densified regions;
joining the second substrate to the first substrate or to some of the elastic elements; and
forming a plurality of rugosities in the laminate by allowing the elastic elements to at least partially contract, wherein the structure of the rugosities is a result of the pattern of the first densified regions and the pattern of the second densified regions.

11. The method of claim 10 , wherein the pattern of the first densified regions is the same as the pattern of the second densified regions.

12. The method of claim 10 , wherein the primary fiber bond pattern is the same in the first and second substrates.

13. The method of claim 10 , comprising forming the first and second densified regions through any of calendering, embossing, thermal bonding, and mechanical bonding.

14. The method of claim 10 , wherein at least one of the densified regions is continuous.

15. The method of claim 14 , wherein at least one of the densified regions is nonlinear.

16. The method of claim 10 , wherein at least one of the densified regions is linear.

17. A method of making a laminate configured to form a portion of an absorbent article, wherein the laminate comprises a plurality of elastic elements disposed at least partially intermediate a first nonwoven substrate and a second nonwoven substrate, and wherein the first nonwoven substrate has a primary fiber bond pattern formed therein that comprises a plurality of primary fiber bonds, the method comprising:
forming densified regions in the first nonwoven substrate, wherein a perimeter of each of the densified regions is larger than a perimeter of each of the primary fiber bonds, and wherein the densified regions together form a pattern of densified regions in the first nonwoven substrate;
adhesively attaching the elastic elements to portions of the first nonwoven substrate in areas free of the densified regions;
joining the second nonwoven substrate to the first nonwoven substrate or to some of the elastic elements; and
forming a plurality of rugosities in the first nonwoven substrate by allowing the elastic elements to at least partially contract, wherein frequency and amplitude ranges of the rugosities result from the pattern of the densified regions.

18. The method of claim 17 , comprising:
applying a patterned adhesive to the first nonwoven substrate; and
attaching the elastic elements to the portion of the first nonwoven substrate using the patterned adhesive.

19. The method of claim 18 , wherein a perimeter of each of the densified regions is greater than 2 mm.

20. The method of claim 19 , wherein an aspect ratio of each of the densified regions is greater than 5.

21. The method of claim 1 , wherein the elastic elements are adhesively attached to the portions of the first substrate in areas of the first substrate that are free of the densified regions.

22. The method of claim 10 , wherein the plurality of rugosities are nested rugosities formed of portions of the first and second substrates.

23. The method of claim 17 , wherein the first nonwoven substrate is nested with the second nonwoven substrate in the plurality of rugosities.

Assignees

• Procter & Gamble

Inventors

• Zink Ronald Joseph
• Wade Sarah Marie
• Lavon Gary Dean
• Ishihara Kaoru

Classifications

• B32B5/04

  characterised by a layer being specifically extensible by reason of its structure or arrangement {, e.g. by reason of the chemical nature of the fibres or filaments} · CPC title

• A61F2013/1591

  via adhesive · CPC title

• A61F13/515

  characterised by the interconnection of the topsheet and the backsheet · CPC title

• A61F2013/49023

  being textured, e.g. corrugated · CPC title

• A61F13/64

  Straps, belts, ties or endless bands ({A61F13/5605, A61F13/5622}, A61F13/66 take precedence) · CPC title