Claims
- 1. A spinneret for the production of multi-grooved filaments, comprising a plate having upper and lower surfaces connected by a capillary, said capillary being defined at the lower surface by a complex orifice that comprises a plurality of apertures, said apertures having flow areas (A), said apertures being located in a row, said apertures having widths (H) in a direction that is perpendicular to said row, and said apertures being interconnected by slots that are also located in said row, said slots having flow areas (a) and widths (h), said widths (h) also being in a direction that is perpendicular to said row, wherein sizes of flow areas A and a are such that the ratio a/A for an aperture and for a slot adjacent thereto is about 0.05:1 to about 0.2:1, and widths H and h are such that the ratio h/H for an aperture and for a slot adjacent thereto is about 0.05:1 to about 0.25:1.
- 2. A spinneret as claimed in claim 1, comprising diamond-shaped apertures in said capillary orifice.
- 3. A spinneret as claimed in claim 1, wherein the width (H) of an aperture at an end of said row is less than the width (H) of an aperture between the ends of said row.
- 4. A spinneret as claimed in claim 1, wherein the slots are odd in number, resulting in filaments having central grooves.
- 5. A spinneret as claimed in claim 1, wherein the slots are even in number and symmetrically located, resulting in filaments of maximum width in the middle of the filament cross-section, there being a longitudinal groove on each side of each of the bulges that contribute to the maximum width of the filament.
CROSS-REFERENCE TO RELATED APPLICATIONS
This is a continuation-in-part of application Ser. No. 08/662,804 filed on Jun. 12, 1996, now U.S. Pat. No. 5,736,243, which is a continuation-in-part of application Ser. No. 08/497,495 filed on Jun. 30, 1995, now U.S. Pat. No. 5,591,523, and a continuation-in-part of application Ser. No. 08/642,650 filed on May 3, 1996, now U.S. Pat. No. 5,626, 961, which is a continuation-in-part of U.S. Pat. No. 08/497,499 filed on Jun. 30, 1995, now abandoned.
US Referenced Citations (13)
Foreign Referenced Citations (1)
Number |
Date |
Country |
4-119118 |
Apr 1992 |
JP |
Continuation in Parts (4)
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Number |
Date |
Country |
Parent |
08/662804 |
Jun 1996 |
US |
Child |
08/778458 |
|
US |
Parent |
08/497495 |
Jun 1995 |
US |
Child |
08/662804 |
|
US |
Parent |
08/642650 |
May 1996 |
US |
Child |
08/497495 |
|
US |
Parent |
08/497499 |
Jun 1995 |
US |
Child |
08/642650 |
|
US |