Method for making random laid bonded continuous filament cloth

• US 4,209,563 A
• Filed: 06/21/1978
• Issued: 06/24/1980
• Est. Priority Date: 06/06/1975
• Status: Expired due to Term

• Current Assignee: The Procter & Gamble Company
• Original Assignee: The Procter & Gamble Company
• Inventors: Sisson, James B.
• Primary Examiner(s): Bell, James J.
• Application Number:
  US05/917,703
• Time in Patent Office: 734 Days
• Field of Search: 264/103, 264/177 F, 264/171, 264/174, 264/DIG. 75, 428/288, 428/296, 156/167, 156/181, 156/176, 156/178, 156/179, 156/209, 156/290, 156/306, 156/229
• US Class Current: 442/329
• CPC Class Codes: D04H 3/16 with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
• CPC Class Codes: Y10T 156/1023 Surface deformation only [e.g., embossing]
• CPC Class Codes: Y10T 442/602 Nonwoven fabric comprises an elastic strand or fiber material
• CPC Class Codes: Y10T 442/632 A single nonwoven layer comprising non-linear synthetic polymeric strand or fiber material and strand or fiber material not specified as non-linear

Abstract

A method of forming an elastic cloth structure comprising fibers of synthetic, organic, relatively elastomeric polymer and fibers of a synthetic, organic, elongatable, but relatively nonelastic polymer. The relatively elastomeric fibers and the elongatable but relatively nonelastic fibers are forwarded for well dispersed random lay down of an unbonded web with random fiber crossings on a porous forming surface. Some of the fiber crossings are then bonded to provide a coherent bonded cloth web and the web is stretched to elongate some of the fibers in at least one direction. The web is then released so that retraction by the relatively elastomeric fibers provides looping and bunching of the elongated relatively nonelastic fibers to thereby provide a low modulus of elasticity in the direction in which the web was worked.

Claims

1. Method of producing elastic cloth comprising, at least the steps of generally continuously forwarding synthetic organic relatively elastomeric fibers and elongatable but relatively non-elastic fibers for well dispersed random laydown of an unbonded web with random fiber crossings onto a forming surface, bonding at least some of said fiber crossings to provide a coherent bonded cloth web and mechanically working said bonded web to elongate at least some of said fibers in at least one direction so that retraction of said relatively elastomeric fibers provides looping and bunching of the elongated relatively non-elastic fibers to thereby develop a low modulus of elasticity in said at least one direction.

2. Method defined in claim 1 wherein said mechanical working comprises stretching of said bonded web in at least said one direction.

3. Method defined in claim 2 wherein said stretching comprises incremental stretching over a short span.

4. Method defined in claim 1 wherein said forming surface comprising a fabric woven to comprise generally uniform height knuckles and said bonding comprises at least the step of passing said web while still supported on said forming fabric through a bonding nip to emboss said web with the fabric knuckles to provide a pattern of spaced apart bond spots.

5. Method defined in claim 4 wherein said fabric knuckles are generally rounded to reduce edge stressing of the bond spots.

6. Method defined in claim 4 further comprising, at least the additional step of, heating said bonding nip to provide autogenous bonding of said web at said knucles.

7. Method defined in claim 1 wherein said step of fowarding comprises at least the steps of, simultaneously melt spinning separate streams of relatively elastomeric filaments and elongatable but relatively non-elastic synthetic organic polymer filaments through separate spinnerette orifices of greater than about 0.007 inch diameter and continuously simultaneously mechanically drawing said streams of filaments from said orifices to reduce them to textile denier and projecting them at high speed to the forming surface.

8. Method defined in claim 7 wherein said separate streams of filaments are mixed during forwarding to such forming surface.

9. Method defined in claim 7 wherein such separate streams of filaments are separately forwarded to such forming surface to form a laminated layered structure.

10. Method defined in claim 2 wherein said fibers comprise generally continuous melt spun filaments.

11. Method defined in claim 7 wherein said melt spinning is through generally linear spinnerettes to form generally planar separate generally uniformly distributed streams of relatively elastomeric filaments and elongatable but relatively non-elastic filaments further comprising, at least the additional step of, simultaneously separately drawing each stream of filaments to simultaneously reduce all filaments to textile denier without disturbing the stream alignment and distribution.

12. Cloth produced by the method of claim 1.

13. Method of making an elastic cloth-like laminate comprising, at least the steps of, forming a synthetic organic elastomeric polymer to define a porous cloth-like layer, forming a synthetic organic stretchable but relatively non-elastic polymer to define a porous cloth-like layer, superposing such layers one above the other, bonding said layers together at a plurality of spaced apart bond points, stretching the resultant laminate to irresversibly stretch the non-elastic layer between the bond points, and subsequently thereto releasing the laminate so that the elastomeric layer recovers to thereby develop crimp in the non-elastic layer between said bond points.