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    • 4. 发明授权
    • Method of predicting yarn caterpillar length
    • 预测纱毛长度的方法
    • US4956902A
    • 1990-09-18
    • US406804
    • 1989-09-12
    • Douglas E. Turek
    • Douglas E. Turek
    • D02G1/14
    • D02G1/14
    • A method of predicting changes in caterpillar length of yarn. The process is used in systems wherein yarn is passed through a set of hot rollers to bulk the fibre and is then contacted with an air jet to pull the yarn away from the rollers and impinge it upon a rotating drum. This drum comprises an endless textured screen forming a cylindrical outer surface of the drum and a frame to support the screen. A caterpillar is thereby formed on the screen. Air is then exhausted from the centre of said drum to draw air through the screen and cool the yarn. The yarn is then pulled off of the screen using take-up rollers. The process for predicting a change in yarn caterpillar length comprises a step of measuring during a given time period: the change in temperature of the exhaust air (dT1), the change in temperature of the yarn (dT2) after it is taken up from the drum and the change in tension of the yarn (dF) after it is taken up from the drum. Caterpillar length change (dL) after this given period of time is then predicted using the correlation: ##EQU1## wherein a,b and c are weighted averages, and a+b+c=1; and wherein: ##EQU2## are all empirically determined constants.
    • 一种预测纱线毛毛虫长度变化的方法。 该方法用于其中纱线通过一组热辊以体积纤维的系统,然后与空气射流接触以将纱线从辊子拉出并将其撞击在旋转的滚筒上。 该鼓包括形成滚筒的圆柱形外表面的无端纹理屏幕和支撑屏幕的框架。 因此,屏幕上形成了一个毛毛虫。 然后从所述滚筒的中心排出空气,以通过筛网抽出空气并冷却纱线。 然后使用卷取辊将纱线从屏幕拉出。 用于预测纱毛长度变化的过程包括在给定时间段内测量的步骤:排出空气(dT1)的温度变化,纱线(dT2)从其中吸收的温度变化(dT2) 滚筒和纱线(dF)从卷筒上取下后的张力变化。 然后使用以下相关性预测该给定时间段之后的卡特彼勒长度变化(dL):其中a,b和c是加权平均值,a + b + c = 1; 并且其中:都是经验确定的常数。