Some effects of calendering on the fabric structure are reported. A cotton broad, nylon 6 taffeta and polyester taffeta were selected for this study. The results are as follows:
(1) The decrease in fabric thickness caused by calendering is mainly due to the closepacking of fibers and flattening of yarns for cotton broad and polyester taffeta, and in addition to these, due to crimpinterchange and decrease of crimp ratio for nylon taffeta.
(2) Furthermore, the change for cotton broad is to spread out to both directions of warp and weft, which also leads to decrease the fabric thickness.
(3) By using the shear-deformation theory developed by Kawabata et al., a contact area, a compressive force and the effect of mechanical entanglement of fibers at an intersection of warp and weft yarns are examined. These values are considerably increased by calendering. This is more evident under higher bowl pressure, and more evident in nylon taffeta than in polyester taffeta.
The influences of frictional calendering on the structural change in fabric are similarly investigated.
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