Patent US3907957A successfully refreshed from Google Patents.
US3907957A
Expired / Lapsed
US
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Quenching process for melt extruded filaments
Assignee: EIDP Inc
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Filing: 1974-04-18
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Granted: 1975-09-23
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Expires: 1994-04-18
Abstract
Abstract Oxidative deposits on a spinneret in a melt spinning process can be reduced by introducing a small amount of a noncondensible inert gas, such as nitrogen, below the steam blanketed zone, but above the point at which quenching air is first directed toward the extruded filaments.
Inventors
- 👤 Donald Edward Shaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:27
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/08; D01D5/088; D01D5/092; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05; B29C48/25; B29C48/27; B29C48/272; D01D5/084; D01F; D01F6/00; D01F6/58; D01F6/60
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
48 words
A PROCESS FOR QUENCHING A MELT EXTRUDED FILAMENT ISSUING FROM A SPINNING PACK WHICH COMPRISES INTRODUCING IMMEDIATELY BELOW THE SPINNING PACK IN SUCCESSIVE FIRST, SECOND AND THIRD ZONES STEAM, NONCONDENSIBLE INERT GAS, AND AIR RESPECTIVELY, AND PASSING THE MELT EXTRUDED FILAMENT THROUGH SAID ZONES TO QUENCH THE FILAMANT.
Claim 2
Dependent Claim
48 words
A PROCESS FOR QUENCHING A MELT EXTRUDED FILAMENT ISSUING FROM A SPINNING PACK WHICH COMPRISES INTRODUCING IMMEDIATELY BELOW THE SPINNING PACK IN SUCCESSIVE FIRST, SECOND AND THIRD ZONES STEAM, NONCONDENSIBLE INERT GAS, AND AIR RESPECTIVELY, AND PASSING THE MELT EXTRUDED FILAMENT THROUGH SAID ZONES TO QUENCH THE FILAMANT.
Claim 3
Dependent Claim
31 words
The process as defined in claim 1, wherein said noncondensible inert gas is nitrogen and amounts to from about 5 to about 20 percent of the volume of air being introduced.
Claim 4
Dependent Claim
15 words
The process as defined in claim 1, said process being a radial cocurrent quenching process.
Claim 5
Dependent Claim
19 words
The process as defined in claim 1, said inert gas being preheated prior to introduction into said second zone.
Claim 6
Dependent Claim
74 words
In a process for quenching a melt extruded filament issuing from a spinning pack that includes the steps of introducing immediately below the spinning pack in successive zones steam and air and passing the filament through the zones to quench the filament, the improvement comprising: replacing a portion of said air being introduced with noncondensible inert gas; and introducing said noncondensible inert gas into a zone between the zones for introducing steam and air.
Claim 7
Dependent Claim
74 words
In a process for quenching a melt extruded filament issuing from a spinning pack that includes the steps of introducing immediately below the spinning pack in successive zones steam and air and passing the filament through the zones to quench the filament, the improvement comprising: replacing a portion of said air being introduced with noncondensible inert gas; and introducing said noncondensible inert gas into a zone between the zones for introducing steam and air.
Claim 8
Dependent Claim
23 words
The process as defined in claim 5, about 5 to about 20 percent of said air being replaced by said noncondensible inert gas.
Claim 9
Dependent Claim
13 words
The process as defined in claim 6, said noncondensible inert gas being nitrogen.
Claim 10
Dependent Claim
16 words
The process as defined in claim 5, said quenching process being a radial cocurrent quenching process.
Claim 11
Dependent Claim
29 words
The process as defined in claim 5, said inert gas being preheated prior to introducing said inert gas into said zone between the zones for introducing steam and air.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |