Y381搖黑板機可將紗線均勻地繞在黑板上，供檢查紗線的外觀評級。YG381型用于棉紡、化纖紗線。YG381M型用于毛紡紗線。黑板尺寸：
YG381型2501802mm
YG381M型3002255mm


YG381 Evenness Test Machine can wrap evenly yarn on the blackboard in order to judge the appearance grade of yarn.YG381 model is suitable for cotton spinning,chemical fibre and yarn. YG381M model is for the use of woolen yarn.