Textiles: spinning – twisting – and twining – Apparatus and processes – Stapilizing
Reexamination Certificate
2011-05-10
2011-05-10
Hurley, Shaun R (Department: 3765)
Textiles: spinning, twisting, and twining
Apparatus and processes
Stapilizing
C019S035000
Reexamination Certificate
active
07937924
ABSTRACT:
A method for forming yarn provides for forming an intermediate product being a fire retardant and heat resistant cohesive elongated network of fibers in a single operation by stretching and breaking filaments of a ribbon like tow starting material of longitudinally aligned filaments. The intermediate product may be wool-like with wavy and randomly oriented fibers formed by from the fragmented filaments. The single drafting operation includes directing the tow through first and second pairs of rollers, the second pair rotating faster than the first. The intermediate product may be spun directly into yarn in one spinning/twisting operation. The fire retardant and heat resistant yarn so produced may include 100% oxidized polyacrylonitrile fibers having an average length greater than about 15 cm. The yarn may be knitted or otherwise formed into fire-retardant and heat resistant fabrics or other products used in various applications.
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“PANOX-oxidized textile fiber” by SGL Carbon Group, 2004.
“Flame Resistant Fiber (Pre-oxidized Acrylic Fiber) Lastan” by Asahi Chemical Industry Co., Ltd, prior to 2005.
Panchanan Pramanik & Ruby Chakraborty, The Unique Story of a High-Tech Polymer, Jun. 2004.
Hurley Shaun R
Lorica International, Inc.
Michaud-Kinney Group LLP
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