ミシン針の貫通力と布の物性

概要

論文の詳細を見る
The penetration force of sewing needle has been estimated using fabric properties. The penetration force was measured by Simple Compression Tester with a sewing needle and a specimen holder attached to it. Many kinds of woven fabrics were used and the needle diameters were varied four times. As a result, the penetration force, W_<p,2> increases exponentially with r/R (r; the radius of needle blade, R; the radius of throat plate hole), which is shown by a following formula; W_<p,2>=K(r/R)^n. While n is constant; n=3, K depends on the sample fabrics and is estimated from the fabric property value, X_i, using the following formula, K=C・X_1^<a1>・X_2^<a2>・X_3^<a3>…X_i^<ai>. C and a_i are constant, and a_i is determined by X_i. The formula was derived by the stepwise residual regression method. X_i is determined on the four fabric properties of shear stiffness, weave density, weight and compression energy. The exponential coefficient of shear stiffness is the largest of the four properties and shear stiffness affects greatly the penetration force of sewing needles. The values of the penetration force calculated using the formula agreed well with those measured in this experiment.