| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that seams of a finished product are monochroic and the product lacks individuality and has a limitation to express diversity, since a sewing yarn that is used for seams of a leather industrial product finished by hand-sewing is always one color.SOLUTION: The sewing yarn is subjected to a processing for dyeing in two colors from a center of the entire length so that seams after sewing is completed are finished to have two colors alternately without fail. |
