US3859031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spinneret capillary metering plugs
Assignee: EIDP Inc
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Filing: 1973-05-10
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Granted: 1975-01-07
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Expires: 1993-05-10
Abstract
Abstract A spinneret for the extrusion of fiber-forming material into shaped filaments is formed from a plate that has its upper and lower surfaces connected by a passage having successive cylindrical and capillary lengths. An insert is fitted in the cylindrical length of the passage to serve as a metering orifice with a resistance to flow at least twice that of the capillary.
Inventors
- 👤 Curtis Owen Hawkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:09
CPC Classifications
D; D01; D01D; D01D4/00; D01D4/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
A spinneret for melt spinning fibers from a polymeric material comprising: a plate having upper and lower surfaces connected by a passage, said passage have successive cylindrical, tapered and capillary lengths, and an insert fitted in said passage, said insert having a central axial bore in alignment with said capillary length, there being a concentric restriction in one end of said bore, said one end being adjacent said tapered length, said restriction being sized to provide a resistance to flow of the fiber forming polymeric material which is greater than the resistance to flow of the fiber forming material by the capillary length.
Claim 2
Dependent Claim
103 words
A spinneret for melt spinning fibers from a polymeric material comprising: a plate having upper and lower surfaces connected by a passage, said passage have successive cylindrical, tapered and capillary lengths, and an insert fitted in said passage, said insert having a central axial bore in alignment with said capillary length, there being a concentric restriction in one end of said bore, said one end being adjacent said tapered length, said restriction being sized to provide a resistance to flow of the fiber forming polymeric material which is greater than the resistance to flow of the fiber forming material by the capillary length.
Claim 3
Dependent Claim
34 words
The spinneret of claim 1, said restriction being sized with respect to said capillary length to provide a resistance to flow at least twice as large the resistance to flow by the capillary length.
Claim 4
Dependent Claim
31 words
The spinneret of claim 1, said central bore in said insert being provided with tapered lengths before and after said restriction to form tapered transitions from the bore to the restriction.
References Cited (Backward Citations)
US3081519A
Cited
US3249669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |