Page 418 - Handbook of Properties of Textile and Technical Fibres

The chemistry, manufacture, and tensile behavior of polyamide fibers 391

0.60 3.96

0.50 Draw ratio
Stress, N/tex 0.40 3.09 2.46

0.30

0.20 1.91
1.00
0.10
0
50 100 150 200 250 300 350 400
Elongation, %
Figure 12.26 Stressestrain diagram of nylon-6 filaments drawn at different draw ratios
(Schultze-Gebhart, 1977).

Elongation (%)

9
8
150
Tenacity (cN/dtex) 6 100 Tenacity
7

5
4
3
50
2
1
0
1 2 3 4 5 6 7
Draw ratio
Figure 12.27 Change of tenacity and elongation of the PA 66 filament as a function of the
draw ratio.

500e1000 m/min and a drawing ratio of 2.6e3.3 is used. For technical PA fibers, the
hot-drawing process, (at temperatures over T g and without neck formation) at speeds
up to 400 m/min, and the draw ratio of 5 in two stages, is adopted (Puffr and Kubanek,
1991b). Practical adjustment of drawing parameters for different types of technical PA
fibers is described in a book by Fourné (1999). It is interesting that the hydrogen bonds