US3677481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for taking up fiber
Assignee: Monsanto Co
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Filing: 1970-06-09
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Granted: 1972-07-18
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Expires: 1990-06-09
Abstract
Abstract An in-line take-up apparatus and process isolate the tensional forces needed in a fiber for good packaging about a wind-up member from the portion of a fiber having very low tensile strength which occurs immediately after extrusion.
Inventors
- 👤 David J Haley
- 👤 Robert E Cunningham
- 👤 Wilbur J Privott Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:47
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/03; B; B22; B22D; B22D11/00; B22D11/005; B65; B65H; B65H59/00; B65H59/10; B65H59/12; B65H2701/00; B65H2701/30; B65H2701/31; Y; Y10; Y10S; Y10S242/00; Y10S242/92
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
137 words
Apparatus for taking up a continuous fiber moving at a velocity upsilon comprising a. a source for a continuous fiber having a low tensile strength in the upstream region. b. first tensioning means including at least one surface situated beneath said fiber source for intercepting said fiber so as to constrain said fiber to move along said surface until a tensional force of about Rho A2 is induced into said fiber, Rho and A being, respectively, the density and crosssectional area of said fiber, at which position along said surface the fiber forms an unsupported loop, and c. means for increasing the tensional force on the fiber to a value about Rho A2 including at least one convex surface engaging said unsupported loop and means for taking up said fiber under a tension greater than Rho A2.
Claim 2
Dependent Claim
137 words
Apparatus for taking up a continuous fiber moving at a velocity upsilon comprising a. a source for a continuous fiber having a low tensile strength in the upstream region. b. first tensioning means including at least one surface situated beneath said fiber source for intercepting said fiber so as to constrain said fiber to move along said surface until a tensional force of about Rho A2 is induced into said fiber, Rho and A being, respectively, the density and crosssectional area of said fiber, at which position along said surface the fiber forms an unsupported loop, and c. means for increasing the tensional force on the fiber to a value about Rho A2 including at least one convex surface engaging said unsupported loop and means for taking up said fiber under a tension greater than Rho A2.
Claim 3
Dependent Claim
52 words
The apparatus of claim 1 in which the take-up means is a rotating bobbin spaced above the point at which the tension in the fiber is about Rho A2 a vertical distance sufficient to increase the tension in the fiber to a value above Rho A2 prior to winding about the bobbin.
Claim 4
Dependent Claim
18 words
a convex region above said ascending second portion for imparting frictionally-induced tensional force to a fiber moving thereacross.
Claim 5
Dependent Claim
18 words
a convex region above said ascending second portion for imparting frictionally-induced tensional force to a fiber moving thereacross.
Claim 6
Dependent Claim
16 words
The apparatus of claim 1 in which the first tensioning means is essentially a concave surface.
Claim 7
Dependent Claim
21 words
The apparatus of claim 3 in which the concave surface intercepts the fiber at an angle of between 0* to 90*.
Claim 8
Dependent Claim
15 words
The apparatus of claim 4 in which the intercept angle is between 20* to 45*.
Claim 9
Dependent Claim
38 words
The apparatus of claim 1 in which the first tensioning means includes a plurality of surfaces positioned to constrain a moving fiber to a path which causes the fiber to have centrifugal forces in directions toward the surfaces.
Claim 10
Dependent Claim
12 words
The apparatus of claim 6 in which the surfaces are essentially flat.
Claim 11
Dependent Claim
12 words
The apparatus of claim 7 in which the surfaces are essentially concave.
Claim 12
Dependent Claim
48 words
The apparatus of claim 8 in which the concave surfaces are arranged in descending order with the bottom portion of each surface positioned adjacent to a top portion of the concave surface therebeneath so as to present a substantially downward path to the fiber moving across the surfaces.
Claim 13
Dependent Claim
39 words
A tensioning device for use in the wind-up of a continuous fiber having an upstream portion of low tensile strength comprising a. a support; b. a multiple curved upper surface supported by said support, said multiple curved surface having
Claim 14
Dependent Claim
39 words
A tensioning device for use in the wind-up of a continuous fiber having an upstream portion of low tensile strength comprising a. a support; b. a multiple curved upper surface supported by said support, said multiple curved surface having
Claim 15
Independent Claim
60 words
A method for taking-up an extruded continuous fiber having a low tensile strength in the upstream region comprising a. constraining the fiber to move in a curved path with at least one surface member so as to induce a tensional force sufficient to cause the fiber to form an unsupported loop and b. winding the fiber about a rotating member.
Claim 16
Independent Claim
60 words
A method for taking-up an extruded continuous fiber having a low tensile strength in the upstream region comprising a. constraining the fiber to move in a curved path with at least one surface member so as to induce a tensional force sufficient to cause the fiber to form an unsupported loop and b. winding the fiber about a rotating member.
Claim 17
Dependent Claim
36 words
The method of claim 11 in which the rotating member is spaced above the point at which the unsupported loop is formed a distance sufficient to cause an increase in the tensional force of the fiber.
Claim 18
Dependent Claim
31 words
The method of claim 11 in which the unsupported loop is terminated by passing the fiber over a convex surface positioned above the point at which the unsupported loop is formed.
Claim 19
Dependent Claim
68 words
A process for taking-up an extruded continuous fiber having a low tensile strength in the upstream region thereof comprising extruding the fiber against a concave surface at a velocity V1, passing the fiber across the concave surface until the fiber forms an unsupported loop, terminating the unsupported loop on a convex surface and passing the fiber across the convex surface, and winding the fiber about a rotating member.
Claim 20
Dependent Claim
68 words
A process for taking-up an extruded continuous fiber having a low tensile strength in the upstream region thereof comprising extruding the fiber against a concave surface at a velocity V1, passing the fiber across the concave surface until the fiber forms an unsupported loop, terminating the unsupported loop on a convex surface and passing the fiber across the convex surface, and winding the fiber about a rotating member.
Claim 21
Dependent Claim
21 words
The process of claim 14 wherein the angle between the concave surface and the extruded fiber is between about 0*to 90*.
Claim 22
Dependent Claim
14 words
The process of claim 14 wherein the angle is between about 20* to 45*.
Claim 23
Dependent Claim
38 words
The process of claim 14 in which the fiber is extruded as a molten stream and subsequently stabilized pending solidification wherein the fiber is wound around the rotating members at a velocity V2 lying between V1 and 1.20V1.
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |