US3847524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spinnerette head assembly with porous metal filter and shear element
Assignee: Individual
•
Filing: 1973-02-01
•
Granted: 1974-11-12
•
Expires: 1993-02-01
Abstract
Abstract A spinnerette head assembly for extrusion of synthetic polymer fibers has a porous extended area filter with porous metal tubular elements extending therefrom to provide a large filtration area. Downstream from the filter or extending within each tubular filter element is a porous metal shear element which provides a desired pressure drop or shear in the liquid polymer passing through the spinnerette head. A shear element must have a larger pore size than the filter so that the shear element will not perform any filtration function. In addition, a shear element must provide a pressure drop or shear at least as great as that provided by the filter upstream of the shear element. If the shear element is a shear disk placed downstream from the filter, constrictors may be placed within or below the tubular elements of the filter to reduce the area of flow into the shear disk and thus provide increased shear.
Inventors
- 👤 L Mott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:08
CPC Classifications
D; D01; D01D; D01D4/00; D01D4/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
113 words
In a spinnerette head assembly for the extrusion of synthetic polymer fibers, said assembly having a filter cup containing a central cavity, and a spinnerette disk containing extrusion apertures, said filter cup having passages leading to the extrusion apertures of said spinnerette disk; filter and shear elements comprising, in combination, an extended area porous metal filter extending into said central cavity having a filter area greater than the cross-sectional area of said cavity, and a porous metal shear element downstream from said filter filtering larger particle sizes than said filter, said shear element providing controlled pressure drop in flow therethrough at least equal to that resulting in flow through said extended area filter.
Claim 2
Dependent Claim
113 words
In a spinnerette head assembly for the extrusion of synthetic polymer fibers, said assembly having a filter cup containing a central cavity, and a spinnerette disk containing extrusion apertures, said filter cup having passages leading to the extrusion apertures of said spinnerette disk; filter and shear elements comprising, in combination, an extended area porous metal filter extending into said central cavity having a filter area greater than the cross-sectional area of said cavity, and a porous metal shear element downstream from said filter filtering larger particle sizes than said filter, said shear element providing controlled pressure drop in flow therethrough at least equal to that resulting in flow through said extended area filter.
Claim 3
Dependent Claim
40 words
The combination according to claim 1 wherein said extended area filter has a base plate and tubular filter elements of porous metal having open ends fixed in said base plate, said tubular filter elements extending upward from said base plate.
Claim 4
Dependent Claim
24 words
The combination according to claim 2 wherein said shear control element comprises porous plugs inserted into the open ends of said tubular filter elements.
Claim 5
Dependent Claim
25 words
The combination according to claim 2 wherein said shear control element comprises a shear disk disposed below said base plate of said extended area filter.
Claim 6
Dependent Claim
36 words
The combination according to claim 4 with the addition of tubular restrictors inserted into the open ends of said tubular filter elements, said restrictors reducing the area of flow entering said shear disk to increase shear.
Claim 7
Dependent Claim
42 words
The combination according to claim 4 with the addition of a perforated plate between said base plate and said shear disk, said plate containing apertures below said tubular filter elements reducing the area of flow entering said shear disk to increase shear.
Claim 8
Dependent Claim
29 words
The combination according to claim 4 wherein said shear disk contains depressions below said tubular filter elements increasing the area of flow entering said shear disk to reduce shear.
Claim 9
Dependent Claim
33 words
The combination according to claim 4 wherein said base plate has a bottom surface containing cavities about each filter tube element increasing the area of flow entering said shear disk to reduce shear.
Claim 10
Dependent Claim
17 words
The combination according to claim 1 wherein said shear element is directly upstream from said spinnerette disk.
Claim 11
Dependent Claim
27 words
The combination according to claim 9 with the addition of a diffuser screen, said shear control element resting against said spinerette disk with said diffuser screen therebetween.
Claim 12
Dependent Claim
75 words
The combination according to claim 1 wherein said spinnerette head assembly has a breaker plate fixed below said extended area filter and said spinnerette disk is fixed below said breaker plate, said breaker plate containing said passages leading to the extrusion apertures of said spinnerette disk and said breaker plate containing a cavity adjacent to said spinnerette disk, said shear element being disposed in said cavity of said breaker plate directly above said spinnerette disk.
Claim 13
Dependent Claim
23 words
The combination according to claim 11 with the addition of a diffuser screen disposed between said spinnerette disk and said shear control element.
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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |