Columnar tube and rolling method thereof

Abstract

A winding method for forming a cylindrical shape bobbin is provided, whereby, an intersection angle (alpha) is varying while the yarn is winded. To guide yarn, a yarn intersection angle (alpha M) at the center zone in the bobbin winding process is between 15-28 degrees and the yarn intersection angle (alpha R) towards the edge zones of two ends of the winding package is larger than that of the center zone.

Description

technical field [0001] The invention relates to a cylindrical bobbin and a method for forming a cylindrical bobbin package with a guide yarn as described in the preamble of claims 1 and 7 . Background technique [0002] The yarn produced by the rotor spinning machine is different from the ring-spun yarn in terms of package structure and unwinding performance. Rotor-spun yarn has less hairiness than ring-spun yarn, so it can be unwound better (easier to lift), but it has a greater rolling tendency than ring-spun yarn, so the yarn at the edge of the package is overlapped The layers are squeezed out. This results in a cross-wound bobbin over a normal winding stroke of eg 150 mm up to a width of 170 to 180 mm. In this case, the required bobbin structure with flat end faces is no longer maintained. This phenomenon occurs in natural fiber yarns, such as cotton yarns, especially in coarse-count yarns, and the thicker the yarn counts, the more prominent the phenomenon. [0003] ...

AI Technical Summary

Problems solved by technology

Since the length of the cone circumference of the cone differs from the axis of the cone, the conical cone for winding comes into contact with the parts on the left and right of the drum drive close to the predetermined friction zone as the diameter of the cone increases. , resulting in fluctuations in the number of revolutions of the bobbin and uncontrollable

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