US3896764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion apparatus for coating both surfaces of tubular material
Assignee: Hoechst AG
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Filing: 1973-07-18
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Granted: 1975-07-29
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Expires: 1993-07-18
Abstract
Abstract This disclosure relates to a process and apparatus for the continuous coating of a tube of fiber material with viscose, the process comprising conveying the tube so that its wall traverses a cylindrical zone of a width of 0.3 to 1.0 mm, defined by external and internal elements, and in its progress through said zone is coated with viscose first on the exterior and then on the interior thereof.
Inventors
- 👤 Erwin Kindl
- 👤 Gunter Gerick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:45
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/15; B29C48/151; B29C48/152; B29C48/153; B29C48/03; B29C48/09
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
196 words
An apparatus for use in the continuous coating of a tube of fiber material with viscose which comprises a cylindrical passage having a width of about 0.3 to 1.0 mm, first annular slot die means having the slot thereof directed inwardly toward said cylindrical passage and in open communication therewith, second annular slot die means having the slot thereof directed outwardly toward said cylindrical passage and in open communication therewith, said first and second slot die means being offset from one another along said cylindrical passage such that a tube of fiber material conveyed through said cylindrical passage is coated with viscose, first on the exterior thereof and then on the interior thereof, first viscose feed means in open communication with said first slot die means and second viscose feed means in open communication with said second slot die means, the distance between the first and the second slot die means, the distance of said first slot die means from the entry opening of the cylindrical passage for the tube and the distance of said second slot die means from the exit opening of said cylindrical passage for said tube being not more than 50 mm.
Claim 2
Independent Claim
196 words
An apparatus for use in the continuous coating of a tube of fiber material with viscose which comprises a cylindrical passage having a width of about 0.3 to 1.0 mm, first annular slot die means having the slot thereof directed inwardly toward said cylindrical passage and in open communication therewith, second annular slot die means having the slot thereof directed outwardly toward said cylindrical passage and in open communication therewith, said first and second slot die means being offset from one another along said cylindrical passage such that a tube of fiber material conveyed through said cylindrical passage is coated with viscose, first on the exterior thereof and then on the interior thereof, first viscose feed means in open communication with said first slot die means and second viscose feed means in open communication with said second slot die means, the distance between the first and the second slot die means, the distance of said first slot die means from the entry opening of the cylindrical passage for the tube and the distance of said second slot die means from the exit opening of said cylindrical passage for said tube being not more than 50 mm.
Claim 3
Dependent Claim
64 words
An apparatus as claimed in claim 1 in which the distance between the entry opening of the cylindrical passage for the tube and the first slot die means and the distance between the exit opening of the cylindrical passage for said tube and the second slot die means are at least 2 mm and at least three times the width of said cylindrical passage.
Claim 4
Dependent Claim
80 words
An apparatus as claimed in claim 2 in which the distance of the first slot die means from the entry opening of the cylindrical passage for the tube and the distance of the second slot die means from the exit opening of said cylindrical passage for said tube are at least 2 mm, but not less than 5 w2 and not more than 50 w2, where w is the numerical value of the width of said cylindrical passage in millimeters.
Claim 5
Dependent Claim
62 words
An apparatus as claimed in claim 1 in which the distance of the first slot die means from the entry opening of the cylindrical passage for the tube and the distance of the second slot die means from the exit opening of said cylindrical passage are 3 to 15 mm and the width of said cylindrical passage is 0.4 to 0.8 mm.
References Cited (Backward Citations)
CA536602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |