US3659989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for improving spinnability and property of composite filament
Assignee: Kanegafuchi Spinning Co Ltd
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Filing: 1970-06-19
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Granted: 1972-05-02
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Expires: 1990-06-19
Abstract
Abstract Method and apparatus for spinning a composite filament wherein two polymers having different melt viscosities are melted separately and the temperature of each maintained so that the melt viscosity ratio of the molten polymers is 0.4 to 2.5 until extrusion. The apparatus includes means for controlling the temperatures of the two spinning melts separately and retarding transmission of heat between the melts until they are extruded together.
Inventors
- 👤 Toru Uraya
- 👤 Shusuke Kageyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:13
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D01D; D01D5/00; D01D5/28; D01D5/30; D01D5/32; D01D5/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
38 words
A spinneret as claimed in claim 1, wherein the means for controlling temperature are jackets to heat each half spinneret divided into two parts by heat insulating means independently from the outside, in which heating media are circulated.
Claim 2
Dependent Claim
33 words
A spinneret as claimed in claim 2, wherein the means for controlling temperature are electric heaters to heat each half spinneret divided into two parts by heat insulation means independently from the outside.
Claim 3
Dependent Claim
105 words
A spinneret for producing a composite filament, which comprises a filter block provided with two melt reservoirs connecting to separate tubes for transferring the spinning melts, a nozzle plate provided with at least one orifice, a distributor plate provided between said filter block and said nozzle plate and provided with two channels to introduce two spinning melts from said melt reservoirs to the rear of the same orifice separately, means for controlling the temperatures of the two spinning melts separately which surround the filter block, the breaker plate, and the nozzle plate, and heat insulating means for retarding transmission of heat between the spinning melts.
Claim 4
Dependent Claim
21 words
A spinneret as claimed in claim 4, wherein the heat insulating means include heat insulators provided between the two melt reservoirs.
Claim 5
Dependent Claim
21 words
A spinneret as claimed in claim 4, wherein at least one row of ventilating holes are provided in the heat insulator.
Claim 6
Dependent Claim
21 words
A spinneret as claimed in claim 4, wherein the means for controlling temperature are electric heaters to heat each half spinneret.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |