Anthony N Dotson

US Patent:

6454975, Sep 24, 2002

Filed:

May 31, 2000

Appl. No.:

09/584618

Inventors:

Anthony Nesbitt Dotson - Hickory NC

Assignee:

OMara Incorporated - Wayne PA

International Classification:

D01D 5088

US Classification:

264 78, 8489, 8497, 8506, 28247, 28271, 264103, 2641711, 2642108, 264211, 26421114, 264510, 264555

Abstract:

Bulk yarns having improved elasticity and recovery and methods for their manufacture are described. A first embodiment of the invention involves providing a solution-dyed multifilament yarn of polybutylene terephthalate (PBT) and a multifilament yarn of a second thermoplastic polymer to an air jet texturizer such that the PBT component forms a core and the other yarn forms a plurality of loops and coils extending outwardly from the core. In addition to a high degree of elasticity and recovery, the composite yarn also has a low amount of shrinkage, which enables the yarns to be used in the production of woven fabrics without significant losses in fabric yield. Another embodiment of the invention involves false twisting a multifilament PBT yarn and a second multifilament yarn as individual threadlines to impart crimp thereto, then entangling the two components together using an air interlacing jet, to produce a bulk yarn having high elasticity and recovery. Because the two components have different optimal draw ratios, the process involves the simultaneous drawing of the components at different draw ratios such as by running different diameter first delivery rolls for the respective components on the first delivery shaft of the machine. Alternatively, a supplemental individually-controllable first delivery shaft can be provided on the machine for feeding one of the components at a different speed from the other, to thereby draw the components at different ratios relative to each other.

US Patent:

61052248, Aug 22, 2000

Filed:

Sep 28, 1998

Appl. No.:

9/162194

Inventors:

J. Joseph O'Mara - Haverford PA
Anthony Nesbitt Dotson - Hickory NC

Assignee:

O'Mara Incorporated - Wayne PA

International Classification:

D02G 116
D02G 100

US Classification:

28271

Abstract:

Bulk yarns having improved elasticity and recovery and methods for their manufacture are described. A first embodiment of the invention involves providing a solution-dyed multifilament yarn of polybutylene terephthalate (PBT) and a multifilament yarn of a second thermoplastic polymer to an air jet texturizer such that the PBT component forms a core and the other yarn forms a plurality of loops and coils extending outwardly from the core. In addition to a high degree of elasticity and recovery, the composite yarn also has a low amount of shrinkage, which enables the yarns to be used in the production of woven fabrics without significant losses in fabric yield. Another embodiment of the invention involves false twisting a multifilament PBT yarn and a second multifilament yarn as individual threadlines to impart crimp thereto, then entangling the two components together using an air interlacing jet, to produce a bulk yarn having high elasticity and recovery. Because the two components have different optimal draw ratios, the process involves the simultaneous drawing of the components at different draw ratios such as by running different diameter first delivery rolls for the respective components on the first delivery shaft of the machine. Alternatively, a supplemental individually-controllable first delivery shaft can be provided on the machine for feeding one of the components at a different speed from the other, to thereby draw the components at different ratios relative to each other.