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US 6,405,519 B1Granted
Composite, break-resistant sewing thread and method
AssigneeBurke Mills, Inc.
InventorsHumayan N. Shaikh, Robert W. Downs, Charles Rex Childers
Life of this patent
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Abstract
A composite, break-resistant sewing thread having a core of continuous multi-filament, non-stretch high-tenacity synthetic yarn and a cover of drafted staple fibers air-jet twisted around and covering the core for protecting the core from heat and friction during a sewing operation. The yarn is plied.
Claims19
A composite, break-resistant sewing thread, comprising:
- (a) a core comprising a continuous filament, non-stretch, fully oriented high-tenacity synthetic yarn;
- and
- (b) a cover comprising drafted staple fibers air-jet twisted around and covering the core for protecting the core from heat and friction during a sewing operation.
A method of producing a composite, break-resistant, non-stretch sewing thread, comprising the steps of:
- (a) feeding a sliver of staple fibers through a plurality of successive drafting zones;
- (b) introducing a continuous filament, high-tenacity synthetic yarn into the sliver downstream of the drafting zones and upstream of an air-jet spinning zone;
- and
- (c) air-jet spinning the sliver in the air-jet spinning zone around the continuous filament yarn to form a core comprising the continuous filament yarn covered with staple fibers comprising a cover for protecting the core from heat and friction during a sewing operation.
1 more element
A composite, break-resistant sewing thread, comprising:
- (a) a core comprising a continuous filament, non-stretch high-tenacity synthetic yarn;
- and
- (b) a cover comprising drafted staple fibers air-jet twisted around and covering the core for protecting the core from heat and friction during a sewing operation wherein the composite thread contains between 5 and 25 twists per inch.
Dependencies are inferred from the claim text.