1998 Volume 39 Issue 4 Pages 246-253
High temperature pressing techniques, such as ironing or calendering, changes the surface structure and luster of fabric as well as the shape and properties of fiber and yarn, and results in a change of fabric properties. The effect of high temperature pressing on the thickness and air permeability of fabrics is studied in this paper.
Cotton and wool fabrics were chosen as the experimental materials. Significant differences in the change of those properties were observed among them.
In relatively heavy cotton fabrics, both properties, the thickness and the air resistance, were varied nearly in proportion to the experimental parameters, that is, finishing temperature, pressure and time. However, temperature among parameters was most effective. The strong negative correlation was observed between thickness and air resistance, that is to say, the air resistance varied inversely with decrease of thickness, which shows the graph of quadratic equation.
In wool fabrics, little corelation between the air resistance and the thickness was observed, although the air resistance was changed with the experimental parameters. This is considerd to show that a complicated variation of the fiber shape and the yarn cross section occurs during the finishing.
In the case of the calendering treated under very high pressure, air resistance is approximately in direct proportion to the temperature even in light fabrics such as cotton broad or nylon taffeta.
