The aim of the research published in the paper was to study the role of the false-twister in the formation of wrap yarns on a hollow spindle machine. Three cases were investigated as follows: without use of false-twister, with single wrapping around the false-twister, and with double wrapping around the false-twister. Wrap yarn structure, geometrical characteristics, and mechanical properties were analyzed. The results obtained showed some discrepancies with former statements in literature, but demonstrated the significant importance of the false-twister for the morphology and properties of the plain wrap yarns.
AngelovaR. Wrap spinning method – present status and future perspectives. Text Cloth2003; 6: 13–18.
2.
AngelovaR. Modern spinning methods with industrial application. Text Cloth J2002, pp. 10–16.
3.
Petrulyt ėS. Analysis of structural effects formation in fancy yarn. Indian Fibre Text Res2007; 32: 21–26.
4.
Petrulyt ėS. Fancy yarns: efforts to methodize, problems and new suggestions. Mat Sci (MEDŽIAGOTYRA)2004; 10: 85–88.
5.
GrabowskaK. Characteristics of loop fancy yarn. Fibers Text East Eur2000; 8: 26–28.
6.
Petrulyt ėSPetrulisD. Forecasting of structural parameters of hollow spindle yarns. Mat Sci (MEDŽIAGOTYRA)2003; 9(3): 89–92.
7.
Petrulyt ėSPetrulisD. Comparison of different theoretical models of fancy yarns. Mat Sci (MEDŽIAGOTYRA)2004; 10(1): 293–296.
8.
XieYOxenhamWGrosbergP. Study of the strength of wrapped yarns – part I: the theoretical model. Text Inst1986; 5: 295–304.
9.
XieYOxenhamWGrosbergP. Study of the strength of wrapped yarns – part II: computation and experimental. Text Inst1986; 5: 305–313.
10.
XieYOxenhamWGrosbergP. Study of the strength of wrapped yarns – part III: the relationship between structural parameters and strength. Text Inst1986; 5: 314–326.
11.
JakowskiTGrabowskaK. Studies of structure and strength of plain wrapped yarns. Fibers Text East Eur1998; April–June 2: 26–31.
12.
ChoiK. Mechanical properties of wrapped yarns. Asian Text1991; 4: 33–37.
13.
GeorgievIKonovaH. Experimental investigation of wrap yarns. EMF scientific conference. (ed V Yordanov), Sozopol, Bulgaria, September 2006, pp. 59–71, Sofia: TU.
14.
BrydonA. Wrap spinning of woolen yarns. Text Month1987; 5: 15–21.
15.
BaoyuZOxenhamW. Influence of production speed on the characteristics of hollow spindle fancy yarns. Text Res1994; 64: 380–387.
16.
DrumevKIvanovI. Determining the slip friction coefficient of the spindles and the delivery roller of a fancy yarns spinning machine Prenomit MC on the basis of yarn twist. Text Cloth2003; 11: 2–4.
17.
AngelovaRKonovaHGeorgievI. Study on the properties cotton wrap yarns. EMF scientific conference. (ed V Yordanov), Sozopol, Bulgaria, September 2008, pp. 117–123, Sofia: TU.
18.
KonovaHAngelovaRGeorgievI. Specifics of wrap yarns with cotton core. Text Cloth2010; 1: 8–11.
19.
AngelovaRHollow spindle spinning. In: LawrenceC (ed). Advances in yarn spinning technology, 1st ed. Cornwall: Woodhead Publishing, 2010, pp. 345–446.
20.
MiaoMHawYChengK. The role of false twist in wrap spinning. Text Res1994; 64: 41–48.
21.
MitovG. A machine and technologies for production of yarns through Prenomit technology - a scientific analysis, 1st ed. Sofia: Tehnika, 1978, pp. 35–35.
22.
HearleJWOne - dimensional structures: yarn geometry. In: BackerSGrosbergPHearleJ (eds). Structural mechanics of fibers, yarns: Fabrics, New York: Wiley-Interscience, 1969, pp. 61–69.
23.
PanN. Development of Constitutive Theory for Short Fiber Yarns: Mechanics of Staple Yarn Without Slippage Effect. Text Res J1992; 62: 749–765.
24.
KřemenákováD. Methods for investigation of yarn structure and properties. Online Referencing, http://centrum.tul.cz (2005, accessed 1 July 2012).
25.
KumarAIsthiaqueSSalhotraK. Study of the effect of spinning process variables on the packing density of ring, rotor and air-jet yarns using the Taguchi method. AUTEX Res2006; 6(3): 122–135.
26.
Kumar A, Isthiaque S and Das A. Analysis of structural changes during extension in ring yarn with image processing system. In: 7th international conference TEXSCI 2010, Lieberec, Czech Republic, September 2010, Lieberec: TU.
27.
HickieTChaikinM. Some aspects of worsted yarn structure, part III: the fibre packing density in the cross-Section of some worsted yarns. Text Inst1974; 65: 433–437.
