Abstract
The paper addresses issues related to the selection of individual indicators to estimate the shape quality of cross-wound packages, as well as the construction of algorithms to determine them automatically. We have developed a method for evaluating the quality of shape of cross-wound packages based on the integrated indicator. To substantiate individual indicators, an expert poll was performed to rank defects in the shape of packages according to the degree of their influence on the suitability of packages for processing at subsequent technological transitions. To quantify each of the specified defect in the shape of a bobbin, we defined individual indicators that make it possible to quantify their impact. We have developed decisive rules and algorithms to calculate them based on the earlier obtained array of data on the coordinates of points at the bobbin’s surface. We have determined a score-based estimate of the influence of each indicator, which characterizes defects in winding, on the suitability of packages for processing at subsequent technological transitions. A comprehensive assessment of the package shape could be obtained using a method of weighted index. The mean weighted index is constructed as a dependence whose arguments are the individual quality parameters and their weighted parameters. Given this, we derived a dependence to calculate the integrated quality indicator of the bobbin’s shape. The higher the value for this indicator, the higher the quality of the controlled package. We have assessed the applicability of the constructed integrated quality indicator to analyzing the shape of packages. To this end, we analyzed a batch of packages, which confirmed the reproducibility of the process of analysis of the package shape using the proposed integrated indicator; as well as correspondence between estimates, derived using the proposed procedure, and visual assessments. A method for the integrated quantification of package shape makes it possible to conduct optimization experiments and to assign, based on them, such adjustable parameters for winding mechanisms that would ensure that packages of the required quality are received. The process of designing new winding equipment could be based on the necessary means to regulate a winding process
Highlights
One of the most common types of textile packages are the cross-wound packages [1]
Considering coefficient K1 to be an argument, and the number of threads in a plait to be the function, it becomes possible, following the approximation of values given in Table 1, to derive a dependence to determine the number of threads in a plait on the height of structures formed by threads when they go beyond the end side of the package
Based on an expert survey, we devised a system of six individual indicators for evaluating the shape of cross-wound packages:
Summary
That is explained by the fact that they meet a wide range of requirements that technologists put forward to them These requirements include: a compact flow of threads when processing at subsequent transitions, uniform permeability when treated with solutions, suitabi lity for long-term storage and transportation without loss of quality. Meeting these requirements is ensured by the corresponding properties of the cross-wound package: its shape, structure, and the stressed-deformed state of a package’s body. Maintaining them at the required level is a criterion for choosing rational structural parameters for winding mechanisms and technological modes of winding The indicators characterizing these properties shall be adjusted in accordance with the requirements to a particular package. It is a relevant task to conduct a study aimed at developing algorithms in order to automatically determine individual indicators for estimating the shape of cross-wound packages
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