Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Description of Figure 1
| n = number of crimp waves per unit length of fibre | L = n l = crimped length of fibre |
| φ = crimp angle | λ = 2l = wave length of crimped fibre |
| lo = side length of one crimp bow | A = crimp amplitude |
| Lo = 2n lo = extended length of fibre | α = angle between crimp leg, fibre axis |
| l = width of one crimp bow |
Parameters of a crimp for different numbers of crimps per unit length
| Number of crimps per 2.54 cm | Width of one crimp bow l (mm) | Crimp length of fibre L (mm) | Crimp angle (φ) |
|---|---|---|---|
| 3 | 8.83 | 26.49 | 145.03° |
| 4 | 6.87 | 27.48 | 136.67° |
| 5 | 5.63 | 28.15 | 126.16° |
Correlation and regression between the number of crimps, crimp length and crimp angle
| S.N | Relation between | Correlation (r) | Regression (p) |
|---|---|---|---|
| 1. | Number of crimps per unit length (2.54 cm) and crimp length of fibre (mm) | r = 0.9976 | p = 0.0440 |
| 2. | Number of crimps per unit length (2.54 cm) and crimp angle (φ) | r = −0.9978 | p = 0.0418 |
Materials used in this research
| Raw material | Yarn count (Tex) | Number of crimps per (2.54 cm) | Yarn twist per 2.54 cm |
|---|---|---|---|
| 100 % jute fibre | 218 | 3 | 4.5 |
| 258 | 4 | ||
| 311 | 5 |
Breaking force, single yarn strength or tenacity and elongation percentage of yarns with different numbers of crimps per unit length
| Breaking force (N) | Yarn strength or tenacity (cN/Tex) | Elongation % | |||||||
|---|---|---|---|---|---|---|---|---|---|
| 3 crimps/2.54 cm | 4 crimps/2.54 cm | 5 crimps/2.54 cm | 3 crimps/2.54 cm | 4 crimps/2.54 cm | 5 crimps/2.54 cm | 3 crimps/2.54 cm | 4 crimps/2.54 cm | 5 crimps/2.54 cm | |
| 1 | 25.67 | 32.56 | 46.96 | 119.60 | 128.06 | 153.50 | 1.39 | 1.51 | 1.97 |
| 2 | 26.26 | 33.24 | 45.32 | 122.35 | 130.74 | 148.11 | 1.19 | 1.58 | 1.72 |
| 3 | 25.89 | 31.96 | 45.01 | 120.49 | 125.70 | 147.13 | 1.49 | 1.71 | 1.87 |
| 4 | 24.91 | 33.87 | 46.59 | 116.06 | 133.22 | 152.29 | 1.48 | 1.36 | 2.27 |
| 5 | 26.58 | 32.04 | 44.91 | 123.46 | 126.02 | 146.80 | 1.68 | 1.41 | 2.47 |
| Avg | 25.86 | 32.71 | 45.75 | 120.46 | 128.74 | 149.56 | 1.44 | 1.51 | 2.06 |