Elastic composite for a disposable absorbent garment, and a system and process for making the elastic composite and a garment having the elastic composite

• US 7,361,246 B2
• Filed: 12/23/2004
• Issued: 04/22/2008
• Est. Priority Date: 12/24/2003
• Status: Active Grant

• Current Assignee: Wells Fargo Foothill, LLC (Wells Fargo & Company)
• Original Assignee: Dsg Technology Holding Limited
• Inventors: Smid, Anne, Wright, Andrew C., Chang, Kuo-Shu Edward, Tsang, Patrick King Yu
• Primary Examiner(s): Mayes; Melvin C.
• Application Number:
  US11/021,424
• Publication Number:
  US 20050139311A1
• Time in Patent Office: 1,216 Days
• Field of Search: 156/202, 156/204, 156/226, 156/227, 156/172, 156/177, 156/259, 156/271, 156/523, 156/527, 156/161, 156/229, 156/430, 156/438, 156/439
• US Class Current: 156/177
• CPC Class Codes: A61F 13/15593 having elastic ribbons fixed thereto; Devices for applying the ribbons
• CPC Class Codes: A61F 13/15699 Forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or without additional treatment of the webs
• CPC Class Codes: A61F 13/49019 the elastic means being placed longitudinally, transversely or diagonally over the article
• CPC Class Codes: A61F 13/4902 characterised by the elastic material
• CPC Class Codes: Y10T 156/10 Methods of surface bonding and/or assembly therefor
• CPC Class Codes: Y10T 156/1008 Longitudinal bending
• CPC Class Codes: Y10T 156/101 Prior to or during assembly with additional lamina
• CPC Class Codes: Y10T 156/1011 Overedge bending or overedge folding
• CPC Class Codes: Y10T 156/1015 Folding
• CPC Class Codes: Y10T 156/1052 with cutting, punching, tearing or severing
• CPC Class Codes: Y10T 156/17 Surface bonding means and/or assemblymeans with work feeding or handling means
• CPC Class Codes: Y10T 428/24132 including grain, strips, or filamentary elements in different layers or components parallel

Abstract

A method is provided for making an elastic composite for incorporation into a disposable absorbent garment. An elastic element applicator is provided that is configured to move a section of a continuous strand of elastic element generally about a plane. A first web of material is conveyed in a first web moving direction such that the first web intersects the plane. Then, the applicator is operated to move the elastic element about the plane, thereby applying the section of elastic element onto the first web along a direction generally transverse to the web moving direction and such that the first web draws the continuous elastic strand from the elastic element applicator as the first web is conveyed away from the plane. The elastic element applicator may be in the form of a spin cylinder or bracket that is operated to spin the elastic element about the moving first web, thereby applying the elastic element on the first web.

Claims

1. A method of making an elastic composite for incorporation into a disposable absorbent garment, said method comprising the steps of:

moving a section of a continuous strand of elastic element generally about a plane;

conveying a first web of material in a web moving direction such that the first web intersects the plane;

moving the elastic element about said plane, thereby applying the section of elastic element onto the first web along a direction generally transverse to said web moving direction;

wherein said conveying step includes folding the first web along two fold lines and inwardly toward an inward surface of the first web to leave a partial section of the first web providing an exposed outward surface, such that the applying step applies the elastic element across the exposed outward surface of the first web; and

cutting the applied elastic strands proximate each fold line; and

unfolding the first web such that a resulting unfolded first web has applied thereon, a centrally located arrangement of a plurality of spaced-apart elastic strands on the partial section and a non-elasticized side region on each side of the arrangement of a plurality of spaced-apart elastic strands.

2. The method of claim 1, wherein the section of elastic element is applied onto the first web such that the section of elastic element is retained thereby and the first web draws the continuous strand of elastic element from the plane as the first web is conveyed away from said plane.

3. The method of claim 1, wherein the elastic element is spun about the first web during the step of moving the section of strand.

4. The method of claim 1, wherein the elastic element is moved about the plane in a reciprocal pattern to periodically apply the elastic onto the first web, thereby applying a plurality of elastic strands onto the first web.

5. The method of claim 4, wherein the elastic strands are applied in generally parallel relation on the first web.

6. The method of claim 4, wherein the folding step provides a generally planar, exposed outward surface having lateral side edges defined by the fold lines, and wherein the cutting step includes cutting each applied section of elastic element at opposing ends proximate the lateral side edges of the first web, thereby separating each section from the continuous strand and creating a plurality of separate elastic elements on the first web.

7. The method of claim 4, further comprising the step of applying a second web of material onto the first web having a plurality of elastic elements applied thereon, thereby providing a web of elastic composite comprising of at least two layers of material and a plurality of elastic strands sandwiched therebetween.

8. The method of claim 7, further comprising the step of applying adhesive to second web prior to said step of applying the second web onto the first web, such that the second web and the first web subsequently adhere together.

9. The method of claim 1, further comprising the step of conveying a second web of material spaced apart from the first web and along a direction parallel with the web moving direction, whereby the step of moving the section of continuous strand applies elastic element on outward faces of the first and second webs of material.

10. The method of claim 9, wherein each of the first and second webs are moved by a pair of juxtaposed conveying platforms that intersect the plane of the moving elastic element.

11. The method of claim 10, further comprising the steps of first conveying the first and second webs on inward faces of the platforms in an initial web moving direction opposite of the first web moving direction, whereby the first and second webs are redirected to the outward faces and in the first web moving direction upon reaching one end of the platforms.

12. The method of claim 1, wherein the folding step further includes the steps of folding the first web along the two side fold lines to create a pair of folded flaps such that, in said step of applying the elastic element, the elastic element is applied across an exposed outward surface having a width defined between the fold lines.

13. The method of claim 12,

wherein the cutting step includes cutting each section of elastic element proximate each of the fold lines of the first web, thereby separating each section from the continuous strand and creating a plurality of separate elastic elements on the outward surface of the first web, whereby the lengths of the elastic elements are generally equal to the width of the outward surface;

and

wherein the unfolding step includes unfolding the folded flaps of the first web such that the resulting first web has applied thereon a plurality of centrally located elastic strands and non-elasticized side regions defined generally outward of the fold lines.

14. The method of claim 13, further comprising the step of applying a second web of material onto the first web having a plurality of elastic elements applied thereon, thereby providing a web of elastic composite comprising of at least two layers of material and a plurality of elastic strands sandwiched therebetween.

15. The method of claim 1, wherein said step of moving a section of a continuous strand includes spinning, a pair of spaced apart sections of elastic element is applied onto the first web generally simultaneously, and wherein said step of moving the elastic element is repeated to apply a plurality of pairs of elastic elements on the first web in spaced apart, generally parallel relation.

16. A method of making an elastic composite for incorporation into a disposable absorbent garment, said method comprising the steps of:

conveying a first web of material;

folding each of the side edges of the first web along a side fold line and inwardly toward an inward surface of the first web to create a pair of folded flaps adjacent the inward surface and an exposed outward surface having a width defined between the fold lines;

applying a plurality of spaced apart elastic strands across the width of the exposed outward surface;

cutting the applied elastic strands proximate each of the fold lines of the first web, such that the lengths of the elastic strands are generally equal to the width of the outward surface; and

unfolding the folded flaps of the first web such that the resulting first web has applied thereon, a plurality of centrally located elastic strands and non-elasticized side regions defined generally outward of the fold lines.

17. The method of claim 16, further comprising the step of applying a second web of material onto the first web having a plurality of elastic strands applied thereon, thereby providing a web of elastic composite including at least two layers of web material and a plurality of elastic strands sandwiched therebetween.

18. The method of claim 16, wherein said step of applying the elastic strands includes applying the strands onto the outward surface in spaced apart generally parallel relation.

19. The method of claim 16, wherein said step of applying the elastic strands includes repeatedly spinning a continuous elastic strand about the first web, and wherein said cutting step includes cutting the elastic strands to separate the elastic strands applied on the outward surface from the continuous strand and from adjacent applied elastic strands on the first web.

20. The method of claim 19, wherein said conveying step includes conveying the first web into the path of the spinning continuous strand, thereby causing the elastic strand to be applied onto the first web.

21. The method of claim 19, wherein said step of applying the elastic strands includes applying the elastic strand so as to be retained by the first web and such that the first web draws the elastic strand as the first web is conveyed away a source of the continuous strand.

22. The method of claim 16, further comprising the steps of:

providing a conveyor assembly for conveying the first web material, the conveyor assembly having two web moving platforms, each having a first platform side and a second platform side disposed opposite of the first platform side and capable of reciprocal motion, the platform being juxtapositioned such that a platform side of each web platform face one another and provide an interface therebetween;

feeding the first web and a second web of the web material into the conveyor assembly so as to be directed in a first web moving direction between and along said interface from one end of the conveyor assembly to an opposite end;

feeding a third web of the web material and a fourth web of the web material onto the conveyor assembly on an exposed side of a web moving platform, such that each of the third web material and fourth web material are directed along the exposed platform side in a direction opposite of the direction of travel of the first and second web material through the interface;

directing each of the first and second web material onto the exposed side of a web moving platform such that the first or second web material is moved in a second direction opposite the first direction, whereby the step of applying a plurality of elastic strands applies elastic strands onto both the first and second web materials, as the first and second web material is moved along the second direction by the web moving platforms; and

applying the third and fourth web material onto the first and second material, respectively, after the continuous elastic strands are applied thereto.

23. The method of claim 16, wherein said step of applying the elastic strands includes spinning a continuous strand about the first web.

24. A method of making an elastic composite for incorporation into a disposable absorbent garment, said method comprising the steps of:

conveying a first sheet of material, including folding the first sheet inwardly along each of two side fold lines to create a pair of folded flaps and an exposed outward surface having a width defined between the fold lines;

spinning a section of a continuous strand of elastic element about the first sheet, thereby applying the section of elastic element onto the exposed outward surface along a direction generally transverse to a web moving direction of the first sheet;

cutting the applied elastic strands proximate each of the fold lines of the first sheet; and

unfolding the folded flaps of the first sheet such that the resulting first sheet has applied thereon, a plurality of centrally located elastic strands and non-elasticized side regions defined generally outward of the elastic strands.

25. The method of claim 24, further comprising the step of applying a second sheet of material onto the first sheet having a plurality of elastic strands applied thereon, thereby providing a web of elastic composite including at least two layers of sheet material and a plurality of elastic strands sandwiched therebetween.

26. The method of claim 24, wherein said step of applying the elastic strands includes applying the strands onto the outward surface in spaced apart generally parallel relation, and wherein said spinning step includes repeatedly spinning a continuous elastic strand about the first sheet, and wherein said cutting step includes cutting the elastic strands to separate the elastic strands applied on the outward surface from the continuous strand and from adjacent applied elastic strands on the first sheet.

27. A system for making an elastic composite for incorporation into a disposable absorbent garment, said system comprising:

a source of a first web of material;

a web conveyor assembly including a first web moving platform for moving said first web thereon, said platform being adapted for reciprocal motion such that the first web is initially moved in a first direction then moved in a second direction opposite of the first direction motion;

a folding assembly operatively positioned between said source of said first web and said web conveyor assembly, said folding assembly being adapted to folding side edges of said first web to create folded flaps prior to the first web being directed to the conveyor assembly; and

a spinning head assembly for applying a continuous elastic strand about said web conveyor assembly and a first web being moved thereon, said spinning head assembly being positioned such a first web being conveyed on said platform is moved into the path of elastic strand being spun by the spinning head assembly.

28. The system of claim 27, wherein said web moving platform includes a continuous movable belt.

29. The system of claim 27, further comprising:

an input source of a second web of material; and

a conveying assembly for conveying the second web toward the web conveyor assembly and interfaced therewith such that the second web is applied onto the first web after elastic strands are applied thereon.

30. The system of claim 29, further comprising an adhesive applicator positioned between said input source of the second web and the web conveyor assembly, said adhesive applicator being operatively associated with said conveying assembly to apply adhesive to a surface of the second web prior to application of said surface to the first web.

31. The system of claim 27, further comprising a source of a second web of material;

wherein the web conveyor assembly includes a first web moving platform and a second web moving platform, said platforms being juxtapositioned so as to provide an interface therebetween for moving said first and second web materials therealong, said first and second web moving platforms being adapted for reciprocal motion; and

wherein said web moving platforms are positioned relative to the spinning head assembly such that spinning head assembly is adapted to applying a continuous elastic strand about said first and second web moving platforms.