Abstract
Knit products are widely used in our daily lives because of their excellent elasticity and warmth retention properties. Among such knit products, many of the products we wear on a daily basis are usually composed of flat knitted fabric, which is the basic structure of knitted fabric. This unique structure of flat knitting gives knit products a high degree of elasticity. However, a defect called Yotari often occurs during the creation of flat knitting. Since the appearance of knit products are impaired by this defect, there is a need to predict the occurrence of such defects and to investigate their causes. The purpose of this study is to predict the occurrence and determine the cause of the problem by dynamically analyzing the yarns knitted on a knitting machine. In this paper, we examine the hypothesis of the cause of Yotari. First, we formulate the yarn based on physical constraints. Next, we formulate the contact and friction between the yarn and the knitting parts. Finally, we dynamically simulate the behavior of the yarn as it is woven by the knitting parts.
