Patent ID: 7051508
Filing Date: 2006-05-30
Classification: D01H

Abstract:
1. Yarn withdrawal device for open-end spinning arrangements, comprising: a yarn withdrawal nozzle, which contains a curved contact surface for guiding yarn which is to be withdrawn and which yarn simultaneously rotates in a crank-like manner, said contact surface graduating from a front surface into an axial channel, a balloon-breaking insert which extends said axial channel, an inner wall of the balloon-breaking insert being provided with raised areas/and or recesses with which the yarn comes into contact, and a channel section between the yarn withdrawal nozzle and the balloon-breaking insert, wherein the contact surface of the yarn withdrawal nozzle is a smooth steel surface, wherein an inner diameter of the channel section is smaller than a smallest inner diameter of the balloon-breaking section, and wherein the inner wall of the balloon-breaking insert is provided with blunted raised areas and/or recesses in such a way that a hairiness of the yarn is achieved in the range of 3 mm, while at the same time values regarding the spinning stability, tear-resistance and evenness of the yarn are achieved as is normally the case with notched contact surfaces of standard yarn withdrawal nozzles without balloon-breaking inserts.