The Effect of Winding Angle on Unwinding Yarn

Pušnik, Nace; Praček, Stanislav

doi:10.21278/tof.40303

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…In the realm of winding dynamics research, several models have been proposed to elucidate various facets of the process. Pušnik et al, in their study [45], explored the effect of winding angle on yarn unwinding, emphasizing the optimization of boundary conditions influencing balloon formation. They developed a mathematical model describing yarn motion during unwinding, incorporating balloon theory, Coriolis force, and the effects of gravity and tangential air drag.…”

Section: Winding Modelsmentioning

confidence: 99%

Analysis and Modeling of the System Boundaries of a High-Speed Direct-Yarn-Placement System for In Situ Impregnation of Carbon Fibre Heavy Tows as Textile Reinforcements for Concrete Parts

Knoch,

Rittner,

Holschemacher

2024

Fibers

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This study investigates a novel approach in modeling the system limits of a braked, high-speed yarn-laying process with in situ impregnation. Special attention is paid to the investigation of the yarn spool overrun after the robot has come to a standstill. This phenomenon occurs at low yarn tensions in combination with high traversing speed and/or acceleration. The modeling of the yarn spool overrun is carried out using physical equations, taking into account the travel speed, acceleration of the robot, and braking force of the spool brake. Previous research has confirmed various operating points of the yarn-laying process, but a comprehensive and complete analysis of the system limits at different operating points and speeds up to 2 m/s is missing. The result of the study is a novel model that describes the system boundaries of the direct-yarn-placement. Furthermore, models for robot braking time, carbon spool diameter, and spool mass are developed. The proposed models have an R2 > 0.9674. Regarding the system stability boundaries, the calculations reveal that, as acceleration rises, the minimum tension requirement also increases. The same trend is found for system velocity. At a=12.5%, a minimum tension of 16 N suffices, compared to 23 N and 32 N at a=25% and 50%, respectively. The impact on tension of quadrupling the speed outweighs that of acceleration, with tension increasing by factors of up to 22.5 and 2, respectively.

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Section: Winding Modelsmentioning

confidence: 99%

Analysis and Modeling of the System Boundaries of a High-Speed Direct-Yarn-Placement System for In Situ Impregnation of Carbon Fibre Heavy Tows as Textile Reinforcements for Concrete Parts

Knoch,

Rittner,

Holschemacher

2024

Fibers

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“…There are more theoretical and experimental research publications in the literature related to balloon theory of yarn unwinding from bobbins, motion of yarn and yarn tension variations during unwinding. They are given in the reference list (Niederer, 2000;Stojilijkovic et al, 1997;Popova and Efmerov, 1970;Ma et al, 2001;Booth, 1957;Isakov, 1961;Alekseenko et al, 1972; 496 IJCST 31,4 Koryagin, 1972;Pusnik and Pracek, 2016;Fraser, 1992;Fraser et al, 1992;Ghosh et al, 2001;Wu et al, 2000;Spleiss, 2001;Clark et al, 2001;Pracek, 2007). Despite the practical importance, amount of experimental research investigating the effect of balloon length (or bobbin frontyarn guide distance) on yarn tension bobbin diameter relation was found to be limited as most of the research was conducted with only three different bobbin diameter and with limited yarn numbers and yarn types.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of effect of balloon length on yarn tension during unwinding

Çelik

Eren

2019

IJCST

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Purpose Yarns of different types are unwound from bobbins in different processes like warping, weaving, doubling and re-winding. It is required that yarn tension remains constant during unwinding in all these processes. Otherwise, it ends with product quality and process efficiency problems. The purpose of this paper is to investigate experimentally the effect of balloon length on yarn tension change with respect to bobbin diameter during unwinding in an attempt to obtain a minimum yarn tension variation. Design/methodology/approach An experimental set up was built. Bobbin diameter was measured by a laser sensor and yarn tension was measured by a single yarn tension sensor. Both sensor outputs were interfaced to a PC via a DAQ cad. A software program was developed in C programming language to read and record the tension and bobbin diameter simultaneously. Experimental study was conducted with three different balloon lengths for both continuous filament and spun yarns of four different yarn numbers and five different unwinding speeds. Findings Results showed that yarn tension change with bobbin diameter was affected in different ways with balloon length depending on yarn number, unwinding speed and yarn type. Originality/value Available literature on the effect of balloon length on yarn tension bobbin diameter relation is limited and measurements were generally conducted for three different bobbin diameters. Yarn tension bobbin diameter relation is obtained in this research for at least eight different diameters and more for three different balloon lengths covering practical application ranges. The results obtained can be used in the design of tension control system for warping and winding machines as well as for setting these machines for optimum efficiency.

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