US3785136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and process for producing torque controlled voluminous set yarn and yarn and fabric produced thereby
Assignee: Leesona Corp
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Filing: 1971-05-10
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Granted: 1974-01-15
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Expires: 1991-05-10
Abstract
Abstract Disclosed is a method and apparatus for producing a torquecontrolled voluminous set yarn. False twisting means are employed to impart a relatively low number of twists per inch to a torque stretch yarn passed under low tension in the region of a yarn heater. The covering power of the yarn, i.e., the bulk or voluminosity of the yarn, thus produced is enhanced and residual torque in the yarn is controlled. Also disclosed is a set yarn with high bulk and reduced torque characteristics and a fabric produced therefrom.
Inventors
- 👤 F Tecce
- 👤 C Dudzik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:42
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/0206
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
138 words
Apparatus for modifying torque in thermoplastic yarn comprising a first and a second yarn heating zone, a first and a second yarn cooling zone, means for false twisting yarn in the region of said first zones to produce torque stretch yarn, means for overfeeding said torque stretch yarn within a range of from 5 to 25 percent through said second heating zone and said second cooling zone so that crimp deformations are present in the yarn but pigtail deformations caused by torque are not permitted to form, and means to reverse twist said yarn in said second zones to an extent that the twist per unit length is no more than 25 percent of the twist per unit length employed in the torque stretch yarn producing process whereby the torque of the set yarn thus produced is reduced.
Claim 2
Dependent Claim
138 words
Apparatus for modifying torque in thermoplastic yarn comprising a first and a second yarn heating zone, a first and a second yarn cooling zone, means for false twisting yarn in the region of said first zones to produce torque stretch yarn, means for overfeeding said torque stretch yarn within a range of from 5 to 25 percent through said second heating zone and said second cooling zone so that crimp deformations are present in the yarn but pigtail deformations caused by torque are not permitted to form, and means to reverse twist said yarn in said second zones to an extent that the twist per unit length is no more than 25 percent of the twist per unit length employed in the torque stretch yarn producing process whereby the torque of the set yarn thus produced is reduced.
Claim 3
Independent Claim
128 words
A method for modifying torque in thermoplastic yarn comprising passing said yarn through a first heating zone and a first cooling zone, false twisting said yarn in the region of said first zones to produce torque stretch yarn, overfeeding said torque stretch yarn within a range of from 5 to 25 percent through a second heating zone and a second cooling zone so that crimp deformations are present in the yarn but pigtail deformations caused by torque are not permitted to form, and reverse twisting said yarn in said second zones to an extent that the twist per unit length is no more than 25 percent of the twist per unit length employed in the torque stretch yarn producing process whereby the torque of the yarn is reduced.
Claim 4
Independent Claim
128 words
A method for modifying torque in thermoplastic yarn comprising passing said yarn through a first heating zone and a first cooling zone, false twisting said yarn in the region of said first zones to produce torque stretch yarn, overfeeding said torque stretch yarn within a range of from 5 to 25 percent through a second heating zone and a second cooling zone so that crimp deformations are present in the yarn but pigtail deformations caused by torque are not permitted to form, and reverse twisting said yarn in said second zones to an extent that the twist per unit length is no more than 25 percent of the twist per unit length employed in the torque stretch yarn producing process whereby the torque of the yarn is reduced.
Claim 5
Independent Claim
131 words
A method for modifying torque in thermoplastic yarn comprising passing said yarn through a first heating zone and a first cooling zone, false twisting said yarn in the region of said first zones to produce torque stretch yarn, overfeeding said torque stretch yarn within a range of from 5 to 25 percent through a second heating zone and a second cooling zone so that crimp deformations are present in the yarn but pigtail deformations caused by torque are not permitted to form, and reverse twisting said yarn in said second zones to an extent that the twist per unit length is no more than 25 percent of the twist per unit length employed in the torque stretch yarn producing process whereby the torque of the set yarn thus produced is modified.
Claim 6
Independent Claim
131 words
A method for modifying torque in thermoplastic yarn comprising passing said yarn through a first heating zone and a first cooling zone, false twisting said yarn in the region of said first zones to produce torque stretch yarn, overfeeding said torque stretch yarn within a range of from 5 to 25 percent through a second heating zone and a second cooling zone so that crimp deformations are present in the yarn but pigtail deformations caused by torque are not permitted to form, and reverse twisting said yarn in said second zones to an extent that the twist per unit length is no more than 25 percent of the twist per unit length employed in the torque stretch yarn producing process whereby the torque of the set yarn thus produced is modified.
Claim 7
Dependent Claim
12 words
A yarn with modified torque produced by the method of claim 3.
Claim 8
Dependent Claim
9 words
A fabric produced from the yarn of claim 4.
Claim 9
Independent Claim
152 words
A method for producing textured thermoplastic yarn comprising the steps of passing a yarn through a first heated zone, false twisting said yarn iN said first heated zone, cooling said yarn and untwisting said yarn whereby a torque stretch yarn is produced exhibiting both crimp deformations and torque induced pigtail deformations if fully relaxed, overfeeding said torque stretch yarn from a fully stretched condition, said overfeeding being with a range of 5 to 25 percent so that said torque stretch yarn passes through a second heated zone with crimp deformations but with torque induced pigtail deformations being prevented from forming, false twisting said yarn in said second heated zone in a direction opposite to the first false twisting and to an extent of not more than 25 percent of the amount of the first false twisting, cooling said yarn and untwisting said yarn whereby a set yarn with reduced torque is produced.
Claim 10
Independent Claim
152 words
A method for producing textured thermoplastic yarn comprising the steps of passing a yarn through a first heated zone, false twisting said yarn iN said first heated zone, cooling said yarn and untwisting said yarn whereby a torque stretch yarn is produced exhibiting both crimp deformations and torque induced pigtail deformations if fully relaxed, overfeeding said torque stretch yarn from a fully stretched condition, said overfeeding being with a range of 5 to 25 percent so that said torque stretch yarn passes through a second heated zone with crimp deformations but with torque induced pigtail deformations being prevented from forming, false twisting said yarn in said second heated zone in a direction opposite to the first false twisting and to an extent of not more than 25 percent of the amount of the first false twisting, cooling said yarn and untwisting said yarn whereby a set yarn with reduced torque is produced.
Claim 11
Dependent Claim
188 words
In a method of making set yarn by the double heater process wherein a thermoplastic yarn is first subjected to a false twisting process to produce a yarn having torque therein which, upon full relaxation of the yarn, causes both crimp deformations and pigtail deformations, said false twisted yarn then being overfed within a range of 5 to 25 percent into the post treating stage so that crimp deformations are present in the yarn but pigtail deformations caused by torque are not permitted to form, said yarn being annealed by heating and subsequent cooling to produce a set yarn having a reduced torque therein which upon relaxation of the yarn causes crimp deformations only, the improvement comprising twisting the yarn being annealed in a reverse direction and to an extent that the twist per unit length is no more than 25 percent of the twist per unit length employed in the earlier false twisting process to avoid the formation of torque induced pigtails in said reverse direction, and then cooling and untwisting the yarn to produce a set yarn having a torque therein less than said reduced torque.
Claim 12
Dependent Claim
188 words
In a method of making set yarn by the double heater process wherein a thermoplastic yarn is first subjected to a false twisting process to produce a yarn having torque therein which, upon full relaxation of the yarn, causes both crimp deformations and pigtail deformations, said false twisted yarn then being overfed within a range of 5 to 25 percent into the post treating stage so that crimp deformations are present in the yarn but pigtail deformations caused by torque are not permitted to form, said yarn being annealed by heating and subsequent cooling to produce a set yarn having a reduced torque therein which upon relaxation of the yarn causes crimp deformations only, the improvement comprising twisting the yarn being annealed in a reverse direction and to an extent that the twist per unit length is no more than 25 percent of the twist per unit length employed in the earlier false twisting process to avoid the formation of torque induced pigtails in said reverse direction, and then cooling and untwisting the yarn to produce a set yarn having a torque therein less than said reduced torque.
Claim 13
Dependent Claim
198 words
In a method of making set yarn by the double heater process wherein a thermoplastic yarn is first subjected to a false twisting process to produce a yarn having torque therein which, upon full relaxation of the yarn, causes both crimp deformations and pigtail deformations, said false twisted yarn then being overfed within a range of 5 to 25 percent into the post treating stage so that crimp deformations are present in the yarn but pigtail deformations caused by torque are not permitted to form, said yarn being annealed by heating and subsequent cooling to produce a set yarn having a reduced torque therein of a given level which upon relaxation of the yarn causes crimp deformations only, the improvement comprising twisting the yarn being annealed in a reverse direction and to an extent that the twist per unit length is no more than 25 percent of the twist per unit length employed in the earlier false twisting process, and then cooling and untwisting the yarn so that the torque in the yarn will be reduced below said given level but the crimp in the yarn will be retained at least at the level obtained by annealing alone.
Claim 14
Dependent Claim
198 words
In a method of making set yarn by the double heater process wherein a thermoplastic yarn is first subjected to a false twisting process to produce a yarn having torque therein which, upon full relaxation of the yarn, causes both crimp deformations and pigtail deformations, said false twisted yarn then being overfed within a range of 5 to 25 percent into the post treating stage so that crimp deformations are present in the yarn but pigtail deformations caused by torque are not permitted to form, said yarn being annealed by heating and subsequent cooling to produce a set yarn having a reduced torque therein of a given level which upon relaxation of the yarn causes crimp deformations only, the improvement comprising twisting the yarn being annealed in a reverse direction and to an extent that the twist per unit length is no more than 25 percent of the twist per unit length employed in the earlier false twisting process, and then cooling and untwisting the yarn so that the torque in the yarn will be reduced below said given level but the crimp in the yarn will be retained at least at the level obtained by annealing alone.
Claim 15
Dependent Claim
9 words
A yarn produced by the method of claim 8.
Claim 16
Dependent Claim
9 words
A fabric produced from the yarn of claim 9.
Claim 17
Dependent Claim
17 words
The method of claim 8 wherein said reverse twisting and said untwisting is accomplished by false twisting.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |