Abstract
The purpose of this article is to consider the behavior and physical properties of the sewing thread during sewing motion in relation to the sewability.
The auther examined the relation between the Sewability and the statical properties of some sewing thread and found no relation between them.
To investigate the reason, the dynamic behavior and the change of physical properties of a sewing thread during Sewing motion is considered with some experiments.
As the results, it is cleared that the dynamic hebavior of a sewing thread are characterized by the condition of high speed extension under high temperature.
And initial modulus, thoughness index, and breaking stress etc., under such conditions are shown, and their influenced on the sewability are considered.
