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 7,740,727 B2
• Filed: 10/31/2007
• Issued: 06/22/2010
• Est. Priority Date: 12/24/2003
• Status: Active Grant

• Current Assignee: Dsg Technology Holding Limited
• Original Assignee: Dsg Technology Holding Limited
• Inventors: Smid, Anne, Wright, Andrew C., Chang, Kuo-Shu Edward, Tsang, Patrick King Yu
• Primary Examiner(s): Aftergut; Jeff H
• Application Number:
  US11/982,349
• Publication Number:
  US 20080176026A1
• Time in Patent Office: 965 Days
• Field of Search: 156/200, 156/196, 156/463, 156/176, 156/177, 156/178, 156/179
• 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:

conveying a first sheet of material on a web moving platform such that the front sheet is moved with the moving platform;

spinning a section of a continuous strand of elastic element three hundred and sixty degrees about the moving platform and the first sheet on the platform, thereby applying the section of elastic element onto the first sheet along a direction generally transverse to a moving first sheet;

cutting the section of elastic element to sever the section from the continuous strand; and

repeating the spinning and cutting steps such that a plurality of spaced apart elastic elements are applied on the first sheet.

2. The method of claim 1, further comprising the step of applying a second sheet of material onto the first sheet having a plurality of elastic elements applied thereon, thereby providing a web of elastic composite having at least two sheets of material and a plurality of elastic elements sandwiched therebetween.

3. The method of claim 1, wherein the applying step includes applying a section of tensioned elastic element onto the moving first sheet such that the section of elastic element is retained thereby and the moving first sheet draws the strand of elastic element from the spinning assembly.

4. The method of claim 1, further comprising positioning a spinning assembly relative to the platform for receiving the continuous strand and spinning an end section of the continuous strand about a plane that intersects the platform, wherein the spinning step includes operating the spinning assembly to spin the section of continuous strand about the plane.

5. The method of claim 4, further comprising the steps of:

feeding a continuous strand of the elastic element to the spinning assembly from a feed source spaced apart from the spinning assembly, whereby the spinning step draws the continuous elastic strand from the feed source.

6. The method of claim 4, wherein the spinning assembly includes a spin head positioned for spinning about the platform, said method further comprising the steps of:

positioning a feed source of the continuous elastic strand in spaced apart relation to the spin head; and

feeding a continuous strand from the feed source to the spin head, whereby the spinning step draws the section of continuous elastic strand from the feed source.

7. The method of claim 1, wherein the spinning step applies a plurality of elastic strands strictly on an outward face of the first sheet in mutual generally parallel relation and in transverse relation to the first sheet moving direction.

8. The method of claim 1, further comprising the step of conveying a second sheet of material spaced apart from the first sheet, whereby the spinning step applies the section of elastic element onto the first sheet and the second sheet along a direction generally traverse to a moving second sheet and the cutting step includes cutting the section of elastic element at two places to sever two elastic strands from the continuous elastic strand.

9. The method of claim 8, wherein each of the first and second webs are moved by a pair of juxtaposed conveying platforms that intersect a plane of about which the elastic element is spun, said method further comprising the steps of first conveying the first and second sheet on the platforms in an initial sheet moving direction opposite of the first sheet moving direction, whereby the first and second sheets are redirected in the first sheet moving direction upon reaching one end of the platforms.

10. The method of claim 1, wherein the spinning step includes spinning an end section of a continuous strand of elastic element generally about a plane, said conveying step including moving the first sheet into and generally past the plane and redirecting the first sheet in the sheet moving direction so that the first sheet returns to intersect the plane whereby the section of elastic element is applied onto the returning first sheet.

11. The method of claim 4, wherein the conveying step includes directing the first sheet of material from a first side of the plane, and wherein the feed source is positioned on a second side of the plane, spaced apart from the plane, the method further comprising the step of:

feeding a strand of the elastic element from the feed source to the spinning assembly.

12. The method of claim 11, wherein the feeding step includes drawing the elastic strand from the feed source to a spin axis of the spinning assembly.

13. The method of claim 12, wherein the conveying step includes directing the sheet of material substantially linearly toward the spin axis from the first side of the plane.

14. The method of claim 13, wherein the sheet of material and the elastic strand being drawn are both directed along a direction coincident with the axes of the spinning assembly and the plane.

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

spinning an end section of a continuous strand of elastic element generally three hundred and sixty degrees about a plane; and

conveying a first web of material, including moving the first web of material into and generally past the plane and redirecting the first web in a web moving direction such that the first web returns to intersect the plane, whereby the section of elastic element is applied onto the returning first web along a direction generally transverse to the web moving direction.

16. The method of claim 15, wherein the conveying step includes conveying the first web on a platform supported by a continuous belt moveable about a looped path, whereby the looped path intersecting the plane at two places.

17. The method of claim 15, wherein the conveying step includes directing the sheet of material from a first side of the plane toward a spin axis of the plane.

18. The method of claim 15, wherein the conveying step includes moving the first web along a first web moving direction into and generally past the plane and then redirecting the first web in a web moving direction that is a reverse of the first web moving direction.

19. The method of claim 15, further comprising the steps of:

feeding the continuous strand of the elastic element to the spinning assembly from a feed source spaced apart from the spinning assembly, whereby the spinning step draws the continuous elastic strand from the feed source.

20. The method of claim 15, wherein the conveying step includes directing the first web of material from a first side of the plane, and wherein the feed source is positioned on a second side of the plane, spaced apart from the plane, the method further comprising the step of:

feeding the continuous strand of elastic element from the feed source to the spinning assembly, whereby the spinning assembly receives the continuous strand.

21. The method of claim 20, wherein the feeding step including drawing the elastic strand from the feed source along a substantially linear path to a spin axis of the spinning assembly;

and

wherein the conveying step includes directing the sheet of material substantially linearly toward the spin axis from the first side of the plane.

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

providing a web moving platform for moving a sheet of material;

positioning a spinning assembly in space apart relation to the web moving platform, the spinning assembly being configured to spin a section of a continuous strand of elastic element generally about a plane intersecting the platform;

positioning a feed source of elastic strand at a location spaced from the spinning assembly;

feeding the spinning head assembly a continuous elastic strand from the feed source;

conveying a first sheet of material in a web moving direction such that the first sheet intersects the plane, including moving the web moving platform such that the first sheet moves therewith;

operating the spinning assembly to spin the end section of continuous elastic strand three hundred and sixty degrees about the plane and about the moving platform and web thereon, thereby applying the end section of elastic strand onto the first sheet along a direction generally transverse to the web moving direction; and

wherein the conveying step includes directing the first sheet of material from a first side of the plane toward a spin axis of the spinning assembly, and wherein the feed source is positioned on a second side of the plane, spaced apart from the plane, such that the feeding step further includes drawing the elastic strand from the feed source toward the spin axis.

23. The method of claim 22, wherein the spinning step draws a continuous elastic strand from the feed source.

24. The method of claim 22, wherein the applying step includes retaining the end section on the moving first sheet, whereby the moving first sheet draws the end section from the plane.

25. The method of claim 22, wherein the web moving platform is supported about a continuous belt and moveable with the belt about a looped path, and wherein the spinning step includes spinning the end section about the belt and about the looped path.

26. The method of claim 22,

wherein the feeding step includes drawing the continuous elastic strand from the feed source along a substantially linear path to the spin axis of the spinning assembly;

and

wherein the conveying step includes directing the sheet of material substantially linearly toward the spin axis from the first side of the plane.

27. The method of claim 22, wherein the conveying step includes moving the first sheet on the moving platform with an exposed outward planar surface and an inward planar surface opposite the exposed planar surface, the operating step including spinning the section of elastic strand about the plane and about the first web, thereby applying the section of elastic element, in tension, onto the exposed outward planar surface of the first web along a direction generally transverse to said web moving direction but spacing the elastic element from the inward planar surface, the method further comprising the steps of:

continuing to convey the first sheet away from the plane with applied sections of elastic elements retained on the exposed outward planar surface; and

cutting the applied sections of elastic element at opposing ends, thereby separating individual elastic elements from the continuous strand and providing a sheet of elastic composite having a layer of the sheet material and a plurality of spaced apart elastic elements retained only on the exposed outward planar surface.