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Maszyny dziewiarskie na INTERMASZ 2002

100%

Grębowski J.

tom nr 5

16-17

Szydełkarki płaskie nowej generacji

100%

Grębowski J.

tom nr 12

47-49

Nowości w dziewiarstwie osnowowym

100%

Grębowski J.

tom nr 4

25-26

Dynamics of yarn tension on knitting machines

80%

Pusch T. , Wünsch I. , Offermann P.

Autex Research Journal

1999/2000

tom Vol. 1, no. 2

54--63

The submitted paper reports a study of investigation of the dynamics of yarn tension, i.e. to the time dependence of the yarn tension on large-diameter circular knitting machines (LCKM). The special feature of this study is the fact that predictions are made for the course of the yarn tension during a single stitch-forming process. Only the yarn tension in the area of the yarn feeder and the yarn guide eye can be measured. Some results of such experimental investigations have already been published [1,2]. In this paper, additional results of theoretical model calculations are presented. In particular, by these calculations it will be possible to determine the structure of the yarn tensile force at the knitting point, i.e. in the region between knitting needles. The calculation of the yarn tension required a numerical solution of a system of non-linear differential equations. The special difficulty lies in the formulation of the non-equilibrium state of the running yarn, especially in the formulation of the robbing-back effect.

Identification of the Process of Dynamic Stretching of Threads in Warp-Knitting Technology

41%

Prążyńska A. , Mikołajczyk Z.

Autex Research Journal

2017

tom Vol. 17, no. 4

334--343

The publication presents a theoretical study of the susceptibility of rheological models of threads to dynamic stretching in the context of modern, highly efficient textile technologies. Input parameters of the four analyzed models, the Kelvin-Voigt model, the Maxwell model, Standard model 2, and the Zener model, corresponded to the actual values of the coefficients of viscosity, elasticity, kinematic and dynamic loading, and stretching speed for the analyzed polyester silk threads produced in a knitting process, with knitting speeds from 700 to 1,600 courses/min. The research proves that the tested thread models behave differently in the stretching process-the Kelvin-Voigt model is sensitive to both the increases in kinematic loading and viscosity coefficient, Standard model 2 is only susceptible to dynamic stiffness, and the Zener model is significantly sensitive to kinematic loading. All responses of the models increase with the increase in stretching speeds. The obtained results indicate substantial “accuracy tolerance” in setting input parameters while identifying dynamics of the knitting process on warp-knitting machines.