Process for producing a plurality of high-strength, high...

Details Process for producing a plurality of high-strength, high... Process for producing a plurality of high-strength, high...

2011-08-16

2011-08-16

Tentoni, Leo B (Department: 1742)

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

C264S184000

Reexamination Certificate

active

07998387

ABSTRACT:
A process for producing a plurality of high strength, high modulus aromatic polyamide filaments that includes extruding an acid solution containing at least 15% by weight of an aromatic polyamide through linearly arranged orifices in a spinneret to provide a warp of filaments, passing the warp of filaments through a layer of non-coagulating fluid into a coagulation bath and subsequently passing the warp through a spin tube, the spin tube having an elongated cross section with at least two opposite sides being parallel to the filament warp with the length of these sides being at least as long as the width of the filament warp, jetting additional coagulating liquid at a constant flow rate about the filaments in a downward direction at an angle between 15° and 75° with respect to the filaments, the jetted coagulating liquid moving downward with the warp of filaments through the spin tube at a velocity of about 50% to 100% of the velocity of the filaments, the coagulating liquid being jetted through a jet channel from either one side of the spin tube which is parallel to the filament warp, and the jet channel having at least the same width as the filament warp.

REFERENCES:
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patent: 4869860 (1989-09-01), Lewis, Jr.
patent: 4898704 (1990-02-01), Luckey
patent: 4965033 (1990-10-01), Chiou
patent: A-3-113008 (1991-05-01), None
Nov. 13, 2009 International Search Report issued in International Application No. PCT/EP2009/059324.
Nov. 13, 2009 Written Opinion issued in International Application No. PCT/EP2009/059324.

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