US3635641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spinnerette for producing hollow filaments
Assignee: Honeywell International Inc
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Filing: 1969-12-03
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Granted: 1972-01-18
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Expires: 1989-12-03
Abstract
Abstract A spinnerette for spinning hollow filaments having a maximum amount of hollow space in relation to the outer dimensions of said filaments. The filaments are extruded from a group of preferably three slots and corresponding three round openings or dots. The polymer occluding area defined by the arrangement of the slots forms substantially an equilateral triangle. The round openings are arranged near or at the ends of the slots, but not in communication with the slots. Filaments melt spun from the nested embodiment of this spinnerette consistently have above 35 percent hollow space. The spinnerette is much less subject to breakage than similar designs. Specific parameters for spinning with such an orifice configuration are set forth.
Inventors
- 👤 Garland L Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:56
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/24; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05; B29C48/09; B29C48/25; B29C48/30; B29C48/345; B29C48/04; B29C48/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
A spinnerette for extruding molten synthetic thermoplastic polymers to provide triangular-shaped hollow filaments comprising a plate containing at least one group of three slots and three dots said slots being spaced in close proximity to form a triangle, each of said dots aligned on the ends of the ends of said slots with the center of each dot directly aligned with the inside edge of said slot said slots and dots being spaced so that air is admitted to the inside of said triangle during extrusion and coalescence occurs between the streams of polymer exiting said slots and dots to form triangular-shaped hollow filaments.
Claim 2
Dependent Claim
104 words
A spinnerette for extruding molten synthetic thermoplastic polymers to provide triangular-shaped hollow filaments comprising a plate containing at least one group of three slots and three dots said slots being spaced in close proximity to form a triangle, each of said dots aligned on the ends of the ends of said slots with the center of each dot directly aligned with the inside edge of said slot said slots and dots being spaced so that air is admitted to the inside of said triangle during extrusion and coalescence occurs between the streams of polymer exiting said slots and dots to form triangular-shaped hollow filaments.
Claim 3
Dependent Claim
10 words
The spinnerette of claim 1 wherein the triangle is equilateral.
Claim 4
Dependent Claim
29 words
The spinnerette of claim 2 wherein said dots are arranged with each dot circumference within the sides of the angle described by the inside edges of the adjacent slots.
Claim 5
Dependent Claim
28 words
The spinnerette of claim 3 wherein the circumference of each dot is tangent to an imaginary line between the nearest adjacent corners of said slot, and equidistant therefrom.
Claim 6
Dependent Claim
62 words
The spinnerette of claim 2 wherein the narrowest dimension between said slots and dots is between about 1 and about 10 mils., the length of said slot is between about 30 and about 100 mils., the radius of the dot is between about 2 and about 12 mils., and the width of said slots is between about 3 and about 10 mils.
Claim 7
Dependent Claim
58 words
The spinnerette of claim 5 wherein the ratio of the length of the slot to the width of the slot is between about 10 to about 20, the radius of the dot is substantially equal to the slot width, and the thickness of the narrowest dimension between the slots and the dots is about one-half the slot width.
Claim 8
Dependent Claim
45 words
The spinnerette of claim 6 wherein said slot width is between about 4 and about 7 mils., the narrowest dimension between said slots is between about 2 and about 4 mils., and the radius of the dot is between about 2 and about 8 mils.
Claim 9
Dependent Claim
54 words
The spinnerette of claim 5 wherein the length of the slot is 0.095 inches, the width of the slot is 0.006 inches, the diameter of the Dot is 0.013 inches, the narrowest dimension between the slots and the dots is 0.0028 inches, and the distance between the centers of the dots is 0.090 inches.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |