Disposable elastic structure

• US 4,977,011 A
• Filed: 09/19/1988
• Issued: 12/11/1990
• Est. Priority Date: 09/19/1988
• Status: Expired due to Fees

• Current Assignee: Paragon Trade Brands, LLC (Medtronic Plc)
• Original Assignee: Weyerhaeuser Company (Weyerhauser)
• Inventors: Smith, Carol L.
• Primary Examiner(s): Bell, James J.
• Application Number:
  US07/245,492
• Time in Patent Office: 813 Days
• Field of Search: 428/231, 428/286, 428/288, 428/293, 428/105, 428/107, 428/109, 428/110, 428/152, 428/181, 428/292, 428/294, 428/284
• US Class Current: 428/152
• CPC Class Codes: A41D 20/00 Wristbands or headbands, e.g. for absorbing sweat
• CPC Class Codes: A41D 31/145 using layered materials
• CPC Class Codes: A41D 31/185 using layered materials
• CPC Class Codes: A61F 13/08 Elastic stockings; for contracting aneurisms
• CPC Class Codes: A61F 13/085 Openable readjustable
• CPC Class Codes: A61F 15/006 Bandage fasteners
• CPC Class Codes: A61F 2013/00119 elastic
• CPC Class Codes: A61F 2013/00251 with macroscopic openings
• CPC Class Codes: B32B 2307/51 Elastic
• CPC Class Codes: B32B 2307/724 Permeability to gases, adsorption
• CPC Class Codes: B32B 2437/00 Clothing
• CPC Class Codes: B32B 2535/00 Medical equipment, e.g. bandage, prostheses or catheter
• CPC Class Codes: B32B 5/022 Non-woven fabric
• CPC Class Codes: B32B 5/04 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 Class Codes: B32B 5/26 another layer next to it also being fibrous or filamentary relative arrangement of fibres or filaments of different layers B32B5/12
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: Y10T 428/24446 Wrinkled, creased, crinkled or creped
• CPC Class Codes: Y10T 428/24686 Pleats or otherwise parallel adjacent folds

Abstract

This invention teaches a low cost, breathable, light weight, soft, disposable elastic structure with surface properties that are characterized by a controlled irregularity of the pleats or shirrs that make up the broad surfaces of the structure. The structure is a layered structure with outer layers of low basis weight breathable material, a central elastic layer, and an adhesive layer that serves to join all the layers together to form a unitary elastic structure.

Claims

1. A breathable elastic structure comprising;

(a) a nonwoven low basis weight first outside breathable layer,

(b) a nonwoven low basis weight second outside breathable layer parallel to the first outside breathable layer,

(c) at least one elastic layer having a multiplicity of elastic strands positioned between the first breathable outside layer and the second breathable outside layer,

(d) at least one adhesive layer bonding the elastic layer and the first outside breathable layer and the second outside breathable layer to form a substantially unitary structure, and

(e) at least one of the layers is configured to introduce into a surface of the elastic structure a controlled irregularity of pleating.

2. The elastic structure of claim 1 wherein the structure is formed by;

(a) stretching a layer of nonintersecting elastic strands,

(b) positioning the layer of elastic strands between the first outside breathable layer and the second outside breathable layer,

(c) adhering the first outside breathable layer and the second outside breathable layer to form a substantially unitary structure, and relaxing the stretching of the elastic layer to cause the elastic layer to contract and to draw the breathable outside layers into pleats having a controlled irregularity and the pleats, when drawn apart, have elastic properties.

3. The elastic structure of claim 2 wherein the controlled irregularity of the surface properties of the elastic structure is achieved by means of a controlled irregularity of the basis weight and a controlled irregularity of the bonding of the breathable outside layers.

4. The elastic structure of claim 2 wherein the controlled irregularity of the surface of the elastic structure is achieved by means of positioning the nonintersecting strands of the elastic out of parallel.

5. The elastic structure of claim 2 wherein the controlled irregularity of the surface of the elastic structure is achieved by means of differential tensioning of adjacent strands of elastic in the elastic layer.

6. The elastic structure of claim 2 wherein the controlled irregularities of the surface of the elastic structure is achieved by means of a controlled irregularity introduced into the adhesive layer of the elastic structure.

7. The elastic structure of claim 2 wherein the controlled irregularity of the surface of the elastic structure is achieved by means of a combination of controlled irregularities in at least one layer of the group of layers consisting of the first outside breathable layer, the second outside breathable layer, the elastic layer and the adhesive layer.

8. The elastic structure of claim 2 wherein the outside breathable layers have a nominal basis weight of less than 40 grams per square meter.

9. The elastic structure of claim 1 wherein the structure is provided with more than one elastic layer and the strands of each elastic layer intersect the strands of an adjacent elastic layer so as to form an elastic structure having elastic properties in more than one direction.

10. The elastic structure of claim 2 wherein the structure is a strap.

11. The elastic structure of claim 2 wherein the structure is a sweat band.

12. The elastic structure of claim 8 wherein the elastic structure forms part of an undergarment.

13. The elastic structure of claim 8 wherein the elastic structure forms part of a support for a body member.

14. The elastic structure of claim 8 wherein the elastic structure forms part of a bandage.

15. A disposable, breathable elastic strap structure comprising;

(a) a first breathable layer,

(b) a second breathable layer,

(c) an elastic layer having a multiplicity of nonintersecting elastic strands located between the first breathable layer and the second breathable layer, and

(d) an adhesive layer by means of which the first breathable layer and the second breathable layer and the elastic layer are joined to form a substantially unitary pleated structure, and the elastic layer consists of between 6 and 10 nonintersecting strands of elastic per lateral inch and the first breathable layer and the second breathable layer are formed of a nonwoven material having a nominal basis weight of between 10 and 40 grams per square meter, and the stretched length of the elastic structure is approximately three times the relaxed length of the elastic structure.

16. A breathable multi-directional elastic structure comprising:

first and second low basis weight nonwoven outside breathable layers;

an adhesive layer sandwiched between and bonding together the first and second breathable layers, the adhesive layer having a first group of substantially parallel bands of adhesive and a second group of substantially parallel bands of adhesive which intersect the first group of adhesive bands, at an intersection angle;

first and second elastic layers sandwiched between the first and second breathable layers, each elastic layer comprising plural elastic strands, the strands of the first and second elastic layers configured to conform to and bond with the respective first and second bands of adhesive; and

the bands and low basis weight cover layers interacting to form a pleated surface.

17. The elastic structure of claim 16 wherein at least one of the layers is configured to introduce into a surface of the elastic structure a controlled irregularity of pleating.

18. The elastic structure of claim 16 wherein the structure is formed by:

tensioning the elastic strands of the first elastic layer;

tensioning the elastic strands of the second elastic layer;

the first and second elastic layers each tensioned in a configuration with the strands conforming to the respective first and second bands of adhesive;

positioning the tensioned first and second elastic layers between the first and second breathable layers;

adhering the first and second breathable layers with the adhesive layer to form a substantially unitary structure; and

releasing the tensioning of the elastic strands of the first and second elastic layers to cause the first and second elastic layers to contract and to draw the outside breathable layers into pleats to form soft and breathable opposing outer surfaces.

19. The elastic structure of claim 18 wherein the tensioning of the elastic strands of the first elastic layer is unequal to the tensioning of the elastic strands of the second elastic layer to produce a multi-directional elastic structure having differing elastic properties in different directions along the outer surfaces of the structure.

20. The elastic structure of claim 16 in which the elastic structure comprises a sheet having first and second opposing edges;

and

the structure also including first and second elastic straps positioned along and secured to the respective first and second opposing edges, each strap comprising an elastic layer having plural elastic strands sandwiched between the first and second nonwoven breathable layers.