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US 4,376,743 AGranted
Melt spinning process
AssigneeFiber Industries, Inc.
InventorJohn R. Dees
Life of this patent
Estimating the term…
Abstract
A spinneret has a number of combined orifices having different nominal dimensions. Yarns spun from such spinnerets have less doff-to-doff average standard deviation of yarn bulk.
Claims6
In a spinneret comprising a plurality of combined orifices having corresponding parts in corresponding arrangement, said parts and arrangement including two or more individual capillaries disposed in angular relationship, separated by a land and arranged to spin a variable denier filament, the improvement comprising, said combined orifices having different nominal dimensions such that either,
- a. corresponding capillary lengths differ by at least 0.0007 inch;
- b. corresponding capillary transverse dimensions differ by at least 0.0002 inch;
- c. the included angles between the corresponding capillaries differ by at least 1 degree;
- or
- d. the land widths between corresponding capillaries differ by at least 0.0006 inch,
- said different nominal dimensions of said combined orifices being selected to reduce doff to doff property variations of yarns spun from said spinneret.
3 more elements
In a spinning process, comprising:
- a. Extruding molten polymer streams of fiber-forming molecular weight through a spinneret having a plurality of combined orifices having corresponding parts in corresponding arrangement, said parts and arrangement including two or more individual capillaries disposed in angular relationship, separated by a land and arranged to spin a variable denier filament:
- and
- b. solidifying said molten streams into filaments having variable deniers along their lengths, the improvement comprising, said combined orifices having different nominal dimensions such that either
- corresponding capillary lengths differ by at least 0.0007 inch;
- corresponding transverse dimensions differ by at least 0.0002 inch;
- the included angles between corresponding capillaries differ by at least 1 degree;
- or the land widths between corresponding capillaries differ by at least 0.0006 inch,
- said different nominal dimensions of said combined orifices being selected to reduce doff to doff property variations of yarns spun from said spinneret.
5 more elements
Dependencies are inferred from the claim text.