Patent ID: 9663878
Date: 2017-05-30
CPC Classifications: D01H

Claim:
1. A method to operate an air jet spinning machine having a spinning unit with a spinning nozzle for manufacturing a yarn, comprising: feeding a fiber strand to the spinning nozzle through an inlet during operation of the spinning unit; imparting a twist to the fiber strand inside a vortex chamber of the spinning nozzle by means of a swirled air current so that a yarn is formed from the fiber strand that leaves the spinning nozzle through an outlet; with an additive dispenser, feeding an additive to a location either within the spinning nozzle or upstream of the spinning nozzle while the air jet spinning machine is operating, the additive applied to any combination of the fiber strand, the yarn, or on sections of the spinning nozzle; monitoring a physical parameter of the yarn leaving the outlet with a sensor system; and based on a measured value of the sensor system correlated to the physical parameter, determining if or how much of the additive was applied to the fiber strand or the yarn.