Abstract
The process of winding is one of the principal processes in the textile industry. Quality of the formed packages largely defines the quality of the finished product in the textile industry, as well as labor productivity and equipment performance. Therefore, attention to analysis of processes of package formation, construction of new promising methods and designs of winding mechanisms, has been growing for many decades. We address issues related to the analysis of control methods over the structure of the cross-wound winding used in spinning production. The structure of winding is understood in the present work as the mutual arrangement of threads when they are laid on the surface of the package. Thus, the parameters of the structure include such quantities as a turn lifting angle, a distance between the points of turn reversal, a step in turns, etc. It is known that the mutual arrangement of turns on the winding body when packages are frictionally driven is not homogeneous. Under certain ratios between rotation speed of the bobbin and motion frequency of the thread guide, the threads are laid on the same place. In this case, the so-called braid formations are observed. If motion frequencies of the bobbin and the thread guide differ slightly from the multiple ones, turns are placed close to each other, in this case, a tape winding is formed. The braid winding is accompanied by a number of phenomena, which negatively affect quality of the formed packages. In this case, the shear and displacement parameters are determined based on empirical data. To substantiate the approach to choosing the technological parameters for such mechanisms, we performed a theoretical analysis of the process of braid structures formation in terms of the force interactions between threads. To make such a choice, it is necessary to have an instrumental procedure for quantifying the winding structure parameters, which is why we have in detail investigated methods for their registration.
Highlights
The relevance of the further development of issues related to forming the cross-wound packages for spinning machines is predetermined by the increased requirements to the qua lity of packages
The filament winding is the winding at which the distance between the turns of a thread is smaller than its diameter dt, that is: Δ ≤ dt
The tape winding is the winding at which the distance between the turns of a thread is less than three diameters of the thread: 2. Literature review and problem statement
Summary
The relevance of the further development of issues related to forming the cross-wound packages for spinning machines is predetermined by the increased requirements to the qua lity of packages. If one finds that any of the turn reversal points А1, А2, ..., Аn exactly matches one of the points В1, В2,..., Вn, which are at a distance multiple to the length of the bobbin’s circumference, it would mean that the turn is laid at the same place, thereby forming the filament winding This will occur in any case if: mL = πDn,. To determine the reasons for breakages that are categorized in technological practice as breakages due to a violation of the shape of a bobbin and the flyoffs of turns, we monitored the breakage at warping machines In this case, we controlled a diameter of the winding that experienced a breakage.
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