Methods of making laminates for absorbent articles

Patent metadata

Field	Value
Publication number	US-11607351-B2
Application number	US-202016868944-A
Country	US
Kind code	B2
Filing date	May 7, 2020
Priority date	May 15, 2012
Publication date	Mar 21, 2023
Grant date	Mar 21, 2023

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:
providing the first substrate and the second substrate the second substrate being undeformed;
mechanically deforming regions in only the first substrate, wherein a perimeter of each of the deformed regions is larger than a perimeter of each of the primary fiber bonds, and wherein the deformed regions together form a pattern of deformed regions in the first substrate;
joining the elastic elements to portions of the first substrate and the undeformed second substrate; 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 deformed regions.

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

3. The method of claim 1 , comprising:
applying a patterned adhesive to the first substrate or the second substrate; and
attaching the elastic elements to the portions of the first substrate or the second substrate using the patterned adhesive.

4. The method of claim 1 , wherein a perimeter of at least some of the deformed regions is greater than 2 mm.

5. The method of claim 1 , wherein an aspect ratio of at least some of the deformed regions is greater than 5.

6. The method of claim 1 , comprising joining the elastic elements to the portions of the first substrate and the second substrate in a direction transverse to a direction of extension of a longest dimension of the deformed regions.

7. 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:
providing the first nonwoven substrate and the second nonwoven substrate;
mechanically forming a pattern of first deformed regions in the first nonwoven substrate, wherein a perimeter of each of the first deformed regions is larger than a perimeter of each of the primary fiber bonds in the first nonwoven substrate;
mechanically forming a pattern of second deformed regions in the second nonwoven substrate, wherein a perimeter of each of the second deformed regions is larger than a perimeter of each of the primary fiber bonds in the second nonwoven substrate, and wherein the pattern of second deformed regions differs from the pattern of first deformed regions;
applying a patterned adhesive to the first or second nonwoven substrate;
attaching the elastic elements, in a prestrained state, to the first and second nonwoven substrates using the patterned adhesive, wherein the elastic elements are attached to the first and second nonwoven substrates in areas of the first and second nonwoven substrates that are free of the deformed regions; and
forming a plurality of rugosities in the laminate by allowing the elastic elements to at least partially contract, wherein a structure of the rugosities is related to the pattern of the first deformed regions and the pattern of the second deformed regions.

8. The method of claim 7 , wherein the primary fiber bond pattern is substantially the same in the first and second nonwoven substrates.

9. The method of claim 7 , wherein at least one of the first deformed regions is continuous.

10. The method of claim 7 , wherein at least one of the first deformed regions is nonlinear.

11. The method of claim 7 , wherein at least one of the first deformed regions is linear.

12. The method of claim 7 , wherein the plurality of rugosities are nested rugosities formed of portions of the first and second nonwoven substrates.

13. 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:
providing the first nonwoven substrate and the second nonwoven substrate the second substract being undeformed;
mechanically deforming regions in only the first nonwoven substrate, wherein a perimeter of each of the deformed regions is larger than a perimeter of each of the primary fiber bonds, and wherein the deformed regions together form a pattern of deformed regions in the first nonwoven substrate;
joining the elastic elements to portions of the first nonwoven substrate and the undeformed second nonwoven substrate in areas free of the deformed regions; 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 deformed regions.

14. The method of claim 13 , comprising:
applying a patterned adhesive to the first nonwoven substrate or the second nonwoven substrate; and
attaching the elastic elements to the portions of the first nonwoven substrate and the second nonwoven substrate using the patterned adhesive.

15. The method of claim 13 , wherein a perimeter of each of the deformed regions is greater than 2 mm.

16. The method of claim 13 , wherein an aspect ratio of each of the deformed regions is greater than 5.

17. The method of claim 13 , 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

• B32B5/26

  another layer {next to it} also being fibrous or filamentary {(relative arrangement of fibres or filaments of different layers B32B5/12)} · CPC title

• B32B3/30

  characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)} · CPC title

• D06N1/00

  Linoleum {, e.g. linoxyn, polymerised or oxidised resin} · CPC title