Patent US3227794A successfully refreshed from Google Patents.
US3227794A
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Process and apparatus for flash spinning of fibrillated plexifilamentary material
Assignee: EIDP Inc
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Filing: 1963-09-13
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Granted: 1966-01-04
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Expires: 1983-09-13
Abstract
No abstract record available.
Inventors
- 👤 Anderson Ronald Dean
- 👤 Romano John Emilio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:38
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/11; D01D1/00; D01D1/06; D01D1/09; D01D5/04; D01F; D01F6/00; D01F6/02; D01F6/04; Y; Y10; Y10S; Y10S264/00; Y10S264/47
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
196 words
A CONTINUOUS PROCESS FOR THE FLASH SPINNING OF FIBRILLATED PLEXIFILAMENTARY MATERIAL BY THE STEPS OF CONTINUOUSLY SUPPLYING UNDER PRESSURE INTO A DISSOLUTION ZONE MOLTEN, SYNTHETIC CRYSTALLIZABLE, ORAGNIC POLYMER OF FILAMENT-FORMING MOLECULAR WEIGHT AND A SOLVENT FOR THE POLYMER, THE CONCENTRATION OF POLYMER BEING 2 TO 20% BY WEIGHT OF THE SOLUTION, DISSOLVING THE POLYMER AND FORMING A POLYMER SOLUTION HAVING A TEMPERATURE OF AT LEAST THE SOLVENT CRITICAL TEMPERATURES MINUS 45*C. AND A PRESSURE ABOVE THE TWO-LIQUID-PHASE PRESSURE BOUNDARY FOR THE SOLUTION, FORWARDING THE SOLUTION THROUGH A TRANSFER ZONE, PASSING THE SOLUTION INTO A PRESSURE LET-DOWN ZONE FOR LOWERING THE PRESSURE OF THE SOLUTION TO BELOW THE TWO-LIQUID-PHASE PRESSURE BOUNDARY FOR THE SOLUTION, MAINTAINING A CONSTANT PRESSURE IN THE TRANSFER ZONE PRECEDING THE PRESSURE LET-DOWN ZONE BY KEEPING THE HEAT BALANCE IN THE TRANSFER ZONE AT SUBSTANTIALLY THE SAME LEVEL AS IN THE DISSOLUTION ZONE AND BY REGULATING THE SUPPLIES OF POLYMER AND SOLVENT TO THE DISSOLUTION ZONE INVERSELY IN RELATION TO THE PRESSURE IN THE TRANSFER ZONE AND IN A FIXED RATIO TO ONE ANOTHER, AND DISCHARGING THE SOLUTION THOROUGH A SPINNERET ORIFICE OF RESTRICTED SIZE TO AN AREA OF SUBSTANTIALLY ATMOSPHERIC PRESSURE AND TEMPERATURE.
Claim 2
Dependent Claim
196 words
A CONTINUOUS PROCESS FOR THE FLASH SPINNING OF FIBRILLATED PLEXIFILAMENTARY MATERIAL BY THE STEPS OF CONTINUOUSLY SUPPLYING UNDER PRESSURE INTO A DISSOLUTION ZONE MOLTEN, SYNTHETIC CRYSTALLIZABLE, ORAGNIC POLYMER OF FILAMENT-FORMING MOLECULAR WEIGHT AND A SOLVENT FOR THE POLYMER, THE CONCENTRATION OF POLYMER BEING 2 TO 20% BY WEIGHT OF THE SOLUTION, DISSOLVING THE POLYMER AND FORMING A POLYMER SOLUTION HAVING A TEMPERATURE OF AT LEAST THE SOLVENT CRITICAL TEMPERATURES MINUS 45*C. AND A PRESSURE ABOVE THE TWO-LIQUID-PHASE PRESSURE BOUNDARY FOR THE SOLUTION, FORWARDING THE SOLUTION THROUGH A TRANSFER ZONE, PASSING THE SOLUTION INTO A PRESSURE LET-DOWN ZONE FOR LOWERING THE PRESSURE OF THE SOLUTION TO BELOW THE TWO-LIQUID-PHASE PRESSURE BOUNDARY FOR THE SOLUTION, MAINTAINING A CONSTANT PRESSURE IN THE TRANSFER ZONE PRECEDING THE PRESSURE LET-DOWN ZONE BY KEEPING THE HEAT BALANCE IN THE TRANSFER ZONE AT SUBSTANTIALLY THE SAME LEVEL AS IN THE DISSOLUTION ZONE AND BY REGULATING THE SUPPLIES OF POLYMER AND SOLVENT TO THE DISSOLUTION ZONE INVERSELY IN RELATION TO THE PRESSURE IN THE TRANSFER ZONE AND IN A FIXED RATIO TO ONE ANOTHER, AND DISCHARGING THE SOLUTION THOROUGH A SPINNERET ORIFICE OF RESTRICTED SIZE TO AN AREA OF SUBSTANTIALLY ATMOSPHERIC PRESSURE AND TEMPERATURE.
Claim 3
Dependent Claim
166 words
APPARATUS FOR CONTINUOUSLY PRODUCING STRAND MATERIAL FROM A SYNTHETIC CRYSTALLINE ORGANIC POLYMER COMPRISING: FEED DEVICES FOR ADVANCING RESPECTIVELY SAID POLYMER IN FLUID FORM AND A HEATED SOLVENT THEREFOR UNDER PRESSURE INTO A DISSOLUTION CHAMBER HAVING AN AGITATION MEANS AND PROVIDING A STREAM OF POLYMER SOLUTION, SLASH SPINNING APPARATUS COMPRISING A SPINNERET ASSEMBLY, SAID SPINNERET ASSEMBLY COMPRISING STRUCTURE WHICH DEFINES A SPINNING ORIFICE AND A CONSTRICTION FOR LOWERING THE PRESSURE OF THE STREAM UPON FLOW THERRETHROUGH PRIOR TO DISCHARGE THROUGH THE SPINNING ORIFICE, A FLOW LINE OPERATIVELY CONNECTING THE DISSOLUTION CHAMBER TO THE SPINNING ORIFICE, MEANS FOR MAINTAINING A CONSTANT TEMPERATURE WITHIN THE FLOW LINE BETWEEN THE DISSOLUTION CHAMBER AND THE CONSTRICTION, PRESSURE CONTROL MEANS FOR INVERSELY VARYING IN A FIXED RATIO THE OUTPUT OF SAID FEED DEVICES DEPENDENT ON THE PRESSURE IN THE FLOW LINE, AND A PRESSURE SENSOR COUPLED WITH THE FLOWING BETWEEN THE DISSOLUTION CHAMBER AND THE CONSTRICTION, SAID PRESSURE SENSOR BEING CONNECTED TO SAID PRESSURE CONTROL MEANS FOR TRANSMITTING A PRESSURE INDICATION THERETO.
Claim 4
Dependent Claim
166 words
APPARATUS FOR CONTINUOUSLY PRODUCING STRAND MATERIAL FROM A SYNTHETIC CRYSTALLINE ORGANIC POLYMER COMPRISING: FEED DEVICES FOR ADVANCING RESPECTIVELY SAID POLYMER IN FLUID FORM AND A HEATED SOLVENT THEREFOR UNDER PRESSURE INTO A DISSOLUTION CHAMBER HAVING AN AGITATION MEANS AND PROVIDING A STREAM OF POLYMER SOLUTION, SLASH SPINNING APPARATUS COMPRISING A SPINNERET ASSEMBLY, SAID SPINNERET ASSEMBLY COMPRISING STRUCTURE WHICH DEFINES A SPINNING ORIFICE AND A CONSTRICTION FOR LOWERING THE PRESSURE OF THE STREAM UPON FLOW THERRETHROUGH PRIOR TO DISCHARGE THROUGH THE SPINNING ORIFICE, A FLOW LINE OPERATIVELY CONNECTING THE DISSOLUTION CHAMBER TO THE SPINNING ORIFICE, MEANS FOR MAINTAINING A CONSTANT TEMPERATURE WITHIN THE FLOW LINE BETWEEN THE DISSOLUTION CHAMBER AND THE CONSTRICTION, PRESSURE CONTROL MEANS FOR INVERSELY VARYING IN A FIXED RATIO THE OUTPUT OF SAID FEED DEVICES DEPENDENT ON THE PRESSURE IN THE FLOW LINE, AND A PRESSURE SENSOR COUPLED WITH THE FLOWING BETWEEN THE DISSOLUTION CHAMBER AND THE CONSTRICTION, SAID PRESSURE SENSOR BEING CONNECTED TO SAID PRESSURE CONTROL MEANS FOR TRANSMITTING A PRESSURE INDICATION THERETO.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |