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US 4,484,436 AGranted
Process for producing a twisted yarn
AssigneeToray Industries, Inc.
InventorsTakashi Nakayama, Seiichi Yamagata, Koji Kajita
Life of this patent
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Abstract
A process for producing a twisted yarn is provided. A sheaf of staple fibers is drafted and bundled to form a bundled sheaf of staple fibers having substantially zero initial twist. At least two such bundled sheaves are then twisted together to form the twisted yarn.
Claims14
A process for producing a twisted yarn comprising the steps of:
- drafting a sheaf of staple fibers;
- bundling said sheaf to form a bundled sheaf of staple fibers having substantially zero initial twist;
- twisting at least two of said bundled sheaves upon each other, and maintaining the strength of the bundled sheaf in a manner to provide a coefficient of finishing twist utilization of more than 150%.
A process for producing a twisted yarn comprising the steps of:
- drafting a sheaf of staple fibers;
- bundling said sheaf to form a bundled sheaf of staple fibers having a core having an initial twist of substantially zero and having wrapping around said core;
- and
- twisting at least two of said bundled sheaves upon each other with a coefficient of finishing twist utilization greater than 150%, said coefficient of finishing twist utilization (RF) being defined by the formula:
- ##EQU5## where STy is the strength of the twisted yarn and SUTy is the strength of the yarn after detwisting the finishing twist.
2 more elements
Dependencies are inferred from the claim text.