Quality and uniformity control of fiber web by roller card system. Part I: dynamic modeling formulation and experimental identification

Abstract

This paper focuses on the uniformity of fiber web output by roller cards, because control of uniform carded fiber webs becomes very important when we want faster and more accurate textile spinning. It will theoretically build the model of the dynamic system, and experimentally verifies the model with an implemented sensor. The system analysis, according to working properties and the active region, is divided into three parts: feed input, main carding, and doffer output. The system input is the mass flow rate of the fiber web per unit area. Firstly, the mathematical model of fibers at the main carding will be obtained, and then the mathematical models of the mass flow rate of fiber web at the input and output will be deduced. The mathematical model of the entire roller card system is finally derived by integrating the aforementioned three parts. The computer simulation confirms that the roller card is a stable system, as was shown in the real system. In the experimental verification, this paper measures the output of fiber web at the doffer with an infrared ray sensor, finds the relationship between the sense signals and mass flow rate of the fiber web, and compares the simulated output of the mathematical model with actual output, in order to verify the accuracy of the theoretical modeling of this system. This theoretic model of the roller card system will be used to control the quality and uniformity of the fiber web, as shown in the subsequent parts of this series of papers.