US4285892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for tapering synthetic fibers at the end portion thereof
Assignee: Shinwa Seisakusho Co Ltd
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Filing: 1980-02-22
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Granted: 1981-08-25
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Expires: 2000-02-22
Abstract
Abstract A process for tapering synthetic fibers at the end portion thereof comprising the steps of inserting synthetic fibers into a supersonic vibration-given etching liquid to an extent that only the end portion of the fibers is immersed therein, withdrawing the fibers from the supersonic vibration-given etching liquid and then washing the treated fibers in a supersonic vibration-given washing liquid, the insertion and withdrawal being alternately repeated each at a predetermined velocity. In one embodiment, the etching liquid has abrasive particles suspended therein or an abrasive brush provided therein.
Inventors
- 👤 Yasuhiro Betsuda
- 👤 Yoshio Taguchi
- 👤 Yasuo Takashashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:11
CPC Classifications
D; D06; D06M; D06M23/00; D06M23/16; D06M23/18; A; A46; A46D; A46D1/00; A46D1/04; A46D1/05; A46D9/00; A46D9/02; D01; D01G; D01G3/00; D06M10/00; D06M10/02
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
98 words
A process for tapering synthetic fibers at the end portion comprising the steps of: inserting the end portions of synthetic fibers at a predetermined velocity into an etching liquid capable of etching or dissolving the fibers while effecting supersonic vibration to the etching liquid, withdrawing the synthetic fibers at a predetermined velocity from the etching liquid while effecting supersonic vibration thereto, the insertion and withdrawal being alternately repeated to taper the fibers at said end portions, and then immersing the thus tapered synthetic fibers in a washing liquid while effecting supersonic vibration thereto to wash said tapered fibers.
Claim 2
Dependent Claim
98 words
A process for tapering synthetic fibers at the end portion comprising the steps of: inserting the end portions of synthetic fibers at a predetermined velocity into an etching liquid capable of etching or dissolving the fibers while effecting supersonic vibration to the etching liquid, withdrawing the synthetic fibers at a predetermined velocity from the etching liquid while effecting supersonic vibration thereto, the insertion and withdrawal being alternately repeated to taper the fibers at said end portions, and then immersing the thus tapered synthetic fibers in a washing liquid while effecting supersonic vibration thereto to wash said tapered fibers.
Claim 3
Dependent Claim
24 words
A process according to claim 1, wherein the etching liquid has abrasive particles suspended therein thereby to promote the tapering of the synthetic fibers.
Claim 4
Dependent Claim
26 words
A process according to claim 1, wherein the etching liquid is provided therein with an abrasive brush thereby to promote the tapering of the synthetic fibers.
Claim 5
Dependent Claim
28 words
A process according to claim 1, 2 or 3, wherein the synthetic fibers are polyamide fibers, polyester fibers, polyacrylic fibers, polyvinyl fibers, polyvinyl chloride fibers or polyurethane fibers.
Claim 6
Dependent Claim
33 words
A process according to claim 1, 2 or 3, wherein the etching liquid is a solution of calcium chloride and m-cresol in methanol in the case where the synthetic fibers are polyamide fibers.
Claim 7
Dependent Claim
29 words
A process according to claim 1, 2 or 3, wherein the etching liquid is a solution of sodium hydroxide in the case where the synthetic fibers are polyester fibers.
Claim 8
Dependent Claim
25 words
A process according to claim 1, 2 or 3, wherein the etching liquid is dimethylformamide in the case where the synthetic fibers are polyacrylic fibers.
Claim 9
Dependent Claim
30 words
A process according to claim 1, 2 or 3, wherein the etching liquid is hot pyridine or hot phenol in the case where the synthetic fibers are polyvinyl alcohol fibers.
Claim 10
Dependent Claim
37 words
A process according to claim 1, 2 or 3 wherein the etching liquid is hot cyclohexanone, hot dioxane or the mixture of acetone and carbon disulphide in a case where the synthetic fibers are polyvinyl chloride fibers.
Claim 11
Dependent Claim
28 words
A process according to claim 1, 2 or 3, wherein the etching liquid is phenol or chloral hydrate in a case where the synthetic fibers are polyurethane fibers.
Claim 12
Dependent Claim
27 words
A process according to claim 1, 2 or 3, wherein the washing liquid is methanol or water alone, or methanol and water in separate and successive use.
Claim 13
Dependent Claim
25 words
A process according to claim 2, wherein the abrasive particles are particulate calcium carbonate, glass microbeads, glass microbaloons, boron carbide, metal microbeads or metal microbaloons.
Claim 14
Dependent Claim
31 words
A process according to claim 3, wherein the abrasive brush is one consisting of slender stainless steel, brass or glass rods the lower end of which is secured to a support.
Claim 15
Dependent Claim
118 words
A process for tapering synthetic fibers at the end portions thereof comprising the steps of: inserting the end portions of synthetic fibers into an etching liquid capable of etching or dissolving the fibers while effecting supersonic vibration of the etching liquid, withdrawing the synthetic fibers from the etching liquid while effecting supersonic vibration of the etching liquid, the insertion and withdrawal being alternately repeated to taper the fibers at said end portions, said supersonic vibration of said etching liquid promoting said etching and dissolving of said fibers and diffusing the portion of the etching liquid in which the dissolved fibers are highly concentrated, and immersing the thus tapered synthetic fibers in a washing liquid to effect washing thereof.
Claim 16
Dependent Claim
118 words
A process for tapering synthetic fibers at the end portions thereof comprising the steps of: inserting the end portions of synthetic fibers into an etching liquid capable of etching or dissolving the fibers while effecting supersonic vibration of the etching liquid, withdrawing the synthetic fibers from the etching liquid while effecting supersonic vibration of the etching liquid, the insertion and withdrawal being alternately repeated to taper the fibers at said end portions, said supersonic vibration of said etching liquid promoting said etching and dissolving of said fibers and diffusing the portion of the etching liquid in which the dissolved fibers are highly concentrated, and immersing the thus tapered synthetic fibers in a washing liquid to effect washing thereof.
Claim 17
Dependent Claim
21 words
A process according to claim 1 comprising effecting said supersonic vibration of said etching liquid to promote etching of said fibers.
Claim 18
Dependent Claim
21 words
A process according to claim 1 comprising effecting said supersonic vibration of said etching liquid to promote dissolution of said fibers.
Claim 19
Dependent Claim
31 words
A process according to claim 1 comprising effecting said supersonic vibration of said etching liquid to diffuse the portion of the etching liquid in which the dissolved fibers are highly concentrated.
Claim 20
Dependent Claim
23 words
A process according to claim 1 comprising effecting said supersonic vibration of said etching liquid to inhibit the bending tendency of said fibers.
Claim 21
Dependent Claim
24 words
A process according to claim 1 comprising effecting said supersonic vibration of said etching liquid to facilitate formation of minute cavities in said fibers.
Claim 22
Dependent Claim
35 words
A process according to claim 1 comprising adjusting the characteristics of the taper on said synthetic fibers by adjusting the velocity of the insertion and withdrawal of said fibers into and from said etching liquid.
Claim 23
Dependent Claim
26 words
A process according to claim 1 wherein said supersonic vibration imparted to said etching liquid is generated at a frequency of from 10 to 50 KHz.
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) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |