Abstract
We section interlaced yarns, take microphotographs and input positions of every filament into a computer using a digitizer. The yarn cross sectional area, the average distance and the average intersectional angle between filaments are defined. It is examined how these quantities and the positions of filaments vary in the yarn axial direction. Furthermore, making a comparison with a raw yarn and a false-twist textured yarn, we clarify quantitatively the structure of interlaced yarns. All test yarns are made of polyester multi-filament yarns (150d/48f).
(1) A raw yarn is composed of linear filaments which lie parallel to each other and has the average intersectional angle of 2°. A false-twist textured yarn is of bulky crimp structure with the cross sectional area of 0.17mm2, the average distance of 0.23mm and the average intersectional angle of 27°.
(2) An interlaced yarn processed of a false-twist textured yarn has the cross sectional area of 0.25mm2, the average distance of 0.28mm, the average intersectional angle of 30° in the opening part and in the tangling part 0.04mm2, 0.11 mm, 30°, respectively. The length of a tangling part is short and the average intersectional angle is almost equal to that of a false-twist textured yarn because of the large effect of false-twist texturing.
Filaments tangle with each other in the tangling part, and in the opening part the yarn shows bulky crimp structure similar to a false-twist textured yarn.
(3) An interlaced yarn processed of a raw yarn has the cross sectional area of 0.35mm2, the average distance of 0.3mm, the average intersectional angle of 8° in the opening part and in the tangling part 0.02mm2, 0.08mm, 17°, respectively. There are remarkable differences of these quantities between opening and tangling parts unlike an interlaced yarn processed of a false-twist textured yarn. In the tangling part filaments tangle with each other, and in the opening part the yarn has the same structure as a raw yarn.
