US3773453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the manufacture of crimped bulky filaments
Assignee: Teijin Ltd
•
Filing: 1971-03-23
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Granted: 1973-11-20
•
Expires: 1991-03-23
Abstract
Abstract Improved apparatus by which a variety of crimped bulky filaments of uniform quality having desired crimp characteristics can be prepared with great operational advantages regardless of variations of the amount of the shrinkage of the filaments that cannot be avoided during the operation, by making it possible to fix in a stationary manner the point of separating crimped filaments from the screen at a desired and optional point without necessitating any performance of operational controls which are practically difficult or impossible, and various disadvantages in respect of the quality of the product and of the process operation that are inevitable in the known process because of the variations of the amount of the shrinkage of the filaments can be overcome.
Inventors
- 👤 H Hino
- 👤 M Saki
- 👤 Y Maezawa
- 👤 T Nakamura
- 👤 N Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:12
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/16
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
117 words
In apparatus for preparing crimped bulky filaments including a feed roll for feeding thermoplastic synthetic continuous filaments to a nozzle for projecting a heated jet stream accompanying the filaments fed to said nozzle, a moving screen upon which the heated jet stream impinges and which allows the heated jet stream to pass through while leaving the filaments of said screen, and a take-up roll for separating the crimped filaments from said screen at a separation point, the crimped filaments having been cooled according to movement of the screen between the impingement point and the separation point, the improvement comprising means holding the filaments on said screen at the separation point to prevent movement of the separation point.
Claim 2
Dependent Claim
117 words
In apparatus for preparing crimped bulky filaments including a feed roll for feeding thermoplastic synthetic continuous filaments to a nozzle for projecting a heated jet stream accompanying the filaments fed to said nozzle, a moving screen upon which the heated jet stream impinges and which allows the heated jet stream to pass through while leaving the filaments of said screen, and a take-up roll for separating the crimped filaments from said screen at a separation point, the crimped filaments having been cooled according to movement of the screen between the impingement point and the separation point, the improvement comprising means holding the filaments on said screen at the separation point to prevent movement of the separation point.
Claim 3
Dependent Claim
101 words
The apparatus described in claim 1 wherein said nozzle includes a housing having a chamber defined therein to receive a heated and compressed gaseous fluid and a tubular passage communicating with said chamber for projecting the fluid; and a hollow guide needle for receiving the filaments, said guide needle being disposed coaxially with said passage to penetrate said housing, said guide needle extending through said chamber and extending into said passage a distance less than one-half of the entire length of said passage to form an annular passage for the fluid between said needle and the inner wall of said passage.
Claim 4
Dependent Claim
28 words
The apparatus described in claim 1 wherein said means for preventing movement of the separation point includes a conical pressing roll contacting said screen at the separation point.
Claim 5
Dependent Claim
84 words
The apparatus described in claim 1 wherein said moving screen is an assembly screen including at least a perforated upper screen and a perforated lower screen, the plane perforation area of each portion of said lower screen overlapping each perforation of said upper screen being smaller than the plane area of each perforation of said upper screen, said portion of said lower screen having an open space sufficient for the jet stream to pass through said portion and freely escape from the assembly screen.
Claim 6
Dependent Claim
35 words
The apparatus described in claim 4 wherein said upper and lower screens are sPaced by a distance of up to 2mm. and said assembly screen has a perforation ratio of from 20 to 70 percent.
Claim 7
Dependent Claim
68 words
The apparatus described in claim 1 wherein said feed roll for feeding the thermoplastic synthetic continuous filaments is a roller having a first portion receiving the filaments and a second portion feeding the filaments to said jet, said first portion having a surface with a coefficient of friction of at least 0.3 and said second portion having a surface with a coefficient of friction of less than 0.2.
Claim 8
Dependent Claim
59 words
The apparatus described in claim 6 wherein said first portion has a surface with a coefficient of friction in the range of 0.3 to 0.4 and said second portion has a surface with a coefficient of friction in the range of 0.15 to 0.2, and the ratio of the latter coefficient to the former coefficient is less than 0.5.
Claim 9
Dependent Claim
35 words
The apparatus described in claim 1 wherein said nozzle has an end portion composed of, or coated with, a material having a thermal conductivity of less than 3.0 X 10 2 cal/cm. sec. * C.
Claim 10
Dependent Claim
20 words
The apparatus described in claim 8 wherein said material is selected from the group consisting of polytetrafluoroethylene resins and ceramics.
Claim 11
Dependent Claim
46 words
The apparatus described in claim 1 and further comprising an additional nozzle projecting a heated jet stream on the filaments on said moving screen at a position where the filaments are maintained at a temperature above the glass transition temperature of a polymer constituting the filaments.
Claim 12
Dependent Claim
28 words
The apparatus described in claim 1 wherein said means for preventing movement of the separation point includes a cylindrical pressing roll contacting said screen at the separation point.
Claim 13
Dependent Claim
30 words
The apparatus described in claim 1 wherein said means for preventing movement of the separation point includes suction means disposed on a side of said screen opposite the take-up roll.
References Cited (Backward Citations)
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US3143784A
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US3169296A
Cited
US3305910A
Cited
US3457611A
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US3543358A
Cited
US3656214A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |