| 摘要 |
An automated system for casting hollow fiber membranes. A coextrusion die (10) is rotated over a stationary coagulation bath. A computer (3) is used to control the motion of the die (10) to make a membrane of desired shape. The nozzle is oriented in a manner that will compensate for distortions that occur in wall thickness in the area of a bend. The nozzle's annulus is offset to make the leading portion of the annulus slightly thicker and the trailing portion thinner at the point where the fluids exit the nozzle, which results in a uniformly symmetric wall thickness. The system includes sercomotors (1A, 1B, 1C), each of which is coupled to an associated position encoder (2A, 2B, 2C). The motors (1A, 1B, 1C) are controlled by a computer (3) via servodrivers (4) and an associated interface card. ALco included in the system are a tub (5) for holding a coagulation bath, bearings (6), carriage (7), screw drive (8) and rotary table (9).
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