| 摘要 |
A method for stretching a tow of filaments wherein the tow is passed under tension through a chamber, the chamber having openings at the ends thereof for passage of the tow, and streams of heated liquid are forced transversely through the tow at the chamber openings at a critical minimum rate at least as great as X = 3,000T 2ROOT (WN/h( mu / rho ) WHERE X IS THE HEATED LIQUID FLOW RATE IN GALLONS PER MINUTE THROUGH EACH OPENING, T is the thickness of the streams of heated liquid in inches at said openings, W is the width of the openings and the liquid streams in inches, h is the height or thickness in inches that the tow is free to assume in passing through the openings, N is the number of filaments in the tow, mu is the viscosity of the heated liquid in pounds per foot-second and rho is the density of the heated liquid in pounds per cubic foot.
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