US3778208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the manufacture of eccentric core/sheath conjugate filaments
Assignee: Imperial Chemical Industries Ltd
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Filing: 1972-06-19
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Granted: 1973-12-11
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Expires: 1992-06-19
Abstract
Abstract Apparatus for the manufacture of sheath/core conjugate filaments in which the sheath component flows into a channel containing a dilobate end portion formed in a plateau on the surface of a spinneret plate and is extruded through an extrusion orifice contained in a counter-bore communicating with the dilobate channel, the core forming material being injected through a Dshaped orifice into the same counter-bore to yield a filament having an eccentrically located D-shaped core.
Inventors
- 👤 D Bisset
- 👤 K Pugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:18
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/28; D01D5/30; D01D5/34
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
186 words
A spinneret assembly for the manufacture of a sheath/core conjugate filament having an eccentrically located D-shaped core, comprising a spinneret plate having an upper and lower face, at least one plateau located on the said upper face in which plateau is formed a channel having a closed end portion surrounding an extrusion orifice counter-bore communicating with an extrusion orifice formed in the lower face of the spinneret plate, a back plate positioned above the spinneret plate and having a lower surface in contact with the said plateau to define a space between the lower surface of the back plate and the upper face of the spinneret plate, which space includes the said channel formed in the plateau, means within the back plate adapted to supply sheath forming polymer to the said space between the lower surface of the back plate and the upper face of the spinneret plate and further means within the back plate located above the spinneret counter-bore for injecting a core forming polymer into the said counter-bore, which means includes a D-shaped orifice formed in the lower surface of the said back plate.
Claim 2
Dependent Claim
186 words
A spinneret assembly for the manufacture of a sheath/core conjugate filament having an eccentrically located D-shaped core, comprising a spinneret plate having an upper and lower face, at least one plateau located on the said upper face in which plateau is formed a channel having a closed end portion surrounding an extrusion orifice counter-bore communicating with an extrusion orifice formed in the lower face of the spinneret plate, a back plate positioned above the spinneret plate and having a lower surface in contact with the said plateau to define a space between the lower surface of the back plate and the upper face of the spinneret plate, which space includes the said channel formed in the plateau, means within the back plate adapted to supply sheath forming polymer to the said space between the lower surface of the back plate and the upper face of the spinneret plate and further means within the back plate located above the spinneret counter-bore for injecting a core forming polymer into the said counter-bore, which means includes a D-shaped orifice formed in the lower surface of the said back plate.
Claim 3
Dependent Claim
15 words
A spinneret assembly according to claim 1, wherein the channel has a dilobate end portion.
Claim 4
Dependent Claim
28 words
A spinneret assembly according to claim 2, wherein the D-shaped orifice has its flat portion perpendicular to the horizontal axis of the channel and in the horizontal plane.
Claim 5
Dependent Claim
26 words
A spinneret assembly according to claim 2, wherein the diameter of the D-shaped orifice is equal to or less than the diameter of the spinneret counter-bore.
Claim 6
Dependent Claim
45 words
A spinneret assembly according to claim 1, wherein the said assembly contains a plruality of channels and the back plate contains an equivalent number of means for supplying sheath and core forming polymer, and means supplying the sheath forming polymer being located adjacent the channels.
Claim 7
Dependent Claim
60 words
A spinneret assembly according to claim 1, wherein the plateau located on the upper face of the spinneret plate Is not in contact with the lower surface of the back plate in the area surrounding the channel formed in the said plateau to allow the sheath polymer to flow into the channel in a very limited amount from all directions.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |