Method for manufacturing filaments from an optically...

Details Method for manufacturing filaments from an optically... Method for manufacturing filaments from an optically...

2003-01-18

2011-12-20

Wollschlager, Jeffrey (Department: 1742)

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

C264S172160, C264S17800F, C425S066000, C425S067000, C425S071000, C425S072200, C425S464000

Reexamination Certificate

active

08080197

ABSTRACT:
The invention pertains to a method for manufacturing filaments from an optically anisotropic spinning solution in which the spinning solution is extruded through a spinneret including a spinning field with a plurality of spinning orifices into a coagulation bath through a slot or diaphragm, the edges thereof being formed by plates with upper and lower sides. The upper sides of the plates are defined as the sides having the shortest distance to the spinning field, wherein the line through the center of the spinning field and perpendicular to the upper sides is located a distance (d) from a parallel line through the center of the slot or diaphragm. The projection of the slot or diaphragm has about the same size and shape as the projection of the spinning field. The plane of the upper side of one plate has a shorter distance to the center of the spinning field than the plane of the upper side of the other plate, and the line has a smaller distance to the edge of plate than to edge of plate. Furthermore, the invention pertains to an air gap spinning device for performing the method.

REFERENCES:
patent: 4193962 (1980-03-01), Roberts
patent: 4320081 (1982-03-01), Lammers
patent: 4702876 (1987-10-01), Ebregt et al.
patent: 5945054 (1999-08-01), Meerman et al.
patent: 0 168 879 (1986-01-01), None
patent: 02 112409 (1990-04-01), None
patent: WO 97/15706 (1997-01-01), None

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