Filaments having alternate S-twisted and Z-twisted helical sections produced by crimping filaments provided with an eccentric anisotropy of shrinkable property by a preferential cooling on one side upon extrusion thereof through a spinneret

• US 4,254,181 A
• Filed: 03/20/1978
• Issued: 03/03/1981
• Est. Priority Date: 03/18/1977
• Status: Expired due to Term

• Current Assignee: Solutia Incorporated (Eastman Chemical Company)
• Original Assignee: Monsanto Company (Bayer AG)
• Inventors: Yu, Jing-Peir, Bromley, James E.
• Primary Examiner(s): Cannon, James C.
• Application Number:
  US05/888,280
• Time in Patent Office: 1,079 Days
• Field of Search: 264/177 F, 428/362, 428/371
• US Class Current: 428/371
• CPC Class Codes: D01D 5/22 with a crimped or curled structure; with a special structure to simulate wool producing crimped or curled effects in filaments or threads after formation D02G1/00
• CPC Class Codes: D01D 5/253 with a non-circular cross section; Spinnerette packs therefor D01D5/38 takes precedence
• CPC Class Codes: Y10T 428/2909 Nonlinear [e.g., crimped, coiled, etc.]
• CPC Class Codes: Y10T 428/2925 Helical or coiled

Abstract

A textured melt-spun filament having alternate S-twisted and Z-twisted helical sections connected by twist reversal regions, the filament having a cross-section comprising a spiral wherein the outer portion of the spiral lies at the inside of the helical sections.

Claims

1. A filament having crimp comprising alternating S-twisted and Z-twisted helically coiled regions connected by twist reversal regions, said filament having a cross-section comprising a spiral wherein the outer portion of said spiral lies at the inside of the coils of said helically coiled regions and having a crimp of at least 8%.

2. The filament defined in claim 1, wherein said spiral cross-section is closed at its inner end.

3. The filament defined in claim 1, wherein said spiral cross-section is open at its inner end.

4. The filament defined in claim 1, wherein said filament has a denier of between about 1.5 and 20.

5. The filament defined in claim 1, wherein said filament is formed from polyester.

6. The filament defined in claim 1, wherein said spiral extends over more than 360 degrees.

7. The filament defined in claim 1, wherein said filament has a crimp of at least 12%.