Claims
- 1. A method of developing bulk in a strand of synthetic yarn comprising feeding said yarn continuously in a generally downward direction and in a substantially tensionless condition, providing an obstruction under said generally downwardly feeding yarn to cause said yarn to be substantially completely relaxed, applying heat and moisture to said obstructed relaxed yarn for substantially complete development of bulk therein, and allowing said bulked yarn to fall downwardly in a free condition without substantial loss of the bulk developed therein.
- 2. A method of developing bulk in a strand of synthetic textile yarn according to claim 1 and characterized further in that said partially obstructing said downward feeding of said yarn obstructs said yarn feeding sufficiently to cause said yarn to curl haphazardly and form an accumulation of relaxed yarn for enhanced bulk development by said applied heat and moisture.
- 3. A method of developing bulk in a strand of synthetic textile yarn according to claim 2 and characterized further in that said partially obstructing said generally downwardly feeding of said yarn is performed at a plurality of successively spaced locations between and from which said yarn is allowed to fall and at at least one of which said yarn accumulation occurs.
- 4. A method of developing bulk in a strand of synthetic textile yarn according to claim 3 and characterized further in that said yarn is accumulated in progressively greater amounts at each successive obstructing location.
- 5. A method of drveloping bulk in a strand of synthetic textile yarn according to claim 4 and characterized further in that said means for applying heat and moisture to said relaxed yarn applies steam to the yarn accumulation at the last of said successive obstructing locations.
- 6. A method of developing bulk in a strand of synthetic textile yarn according to claim 5 and characterized further by imposing an upward draft on said applied steam to cause it to flow upwardly through said successive obstructing locations.
- 7. A method of developing bulk in a strand of synthetic textile yarn according to claim 1 and characterized further by adjusting the generally downward direction of feeding of said yarn to obtain optimum relaxation of said yarn by said obstructing of said yarn.
- 8. A method of developing bulk in a strand of synthetic textile yarn according to claim 1 and characterized further by collecting said bulked yarn in a free-falling condition for subsequent heat-setting treatment without further direct handling of said collected yarn.
- 9. A method of developing bulk in a strand of synthetic textile yarn according to claim 1 and characterized further by imparting repetitious lateral motion to said bulked yarn before completion of said allowing it to fall downwardly, thereby loosening said bulked yarn to minimize entanglements therein.
- 10. A method of developing bulk in a strand of synthetic textile yarn according to claim 9 and characterized further in that said imparting repetitious lateral motion imparts a reciprocating lateral motion to said yarn.
- 11. A method of developing bulk in a strand of synthetic textile yarn according to claim 9 and characterized further by partially obstructing said yarn while imparting said repetitious lateral motion thereto.
- 12. A method of developing bulk in a strand of synthetic textile yarn according to claim 9 and characterized further in that said imparting repetitious lateral motion is performed after said applying heat and moisture.
CROSS-REFERENCES TO RELATED APPLICATIONS
This application is a continuation of U.S. patent application Ser. No. 310,476, filed Nov. 29, 1972, which is abandoned concurrently with the filing of the present application, and which was a continuation-in-part of U.S. patent application Ser. No. 169,001, filed Aug. 4, 1971, now abandoned.
US Referenced Citations (8)
Continuations (1)
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Number |
Date |
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Parent |
310476 |
Nov 1972 |
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Continuation in Parts (1)
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Number |
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169001 |
Aug 1971 |
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