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1

Assumptions for the Fiber Movement Model in the Drawing Mechanism Field in Modified Regulation Systems

Idzik Marek

Autex Research Journal

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2020

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Vol. 20, no. 1

11--16

EN

The paper presents assumptions for the fiber movement model in the drawing mechanism field, aiming at establishing a regulation equation with a modified operation algorithm of the short-term draft regulator of slivers made of staple fibers. The model takes into account the sliver retardation phenomena and makes it possible to increase the evenness of slivers feeding successive machines in the technological process. As a result of this, the evenness of yarn will be increased contributing to an improvement in the quality of flat textile fabrics. This model, despite simplifying assumptions, sufficiently precisely presents the phenomenon of reducing the effect of drawing waves on the distribution of the linear mass of the fiber stream.

2

Analysis of Changes in Fiber Density Distribution in a Cotton Combed Spinning System Using Modified Regulation of the Sliver Draft

Idzik Marek

Autex Research Journal

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2019

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Vol. 19, no. 1

54--59

EN

Shortening the technological spinning processes, aiming at the reduction in production costs, causes problems with keeping up a high quality of yarn. Of great significance is the use of autolevellers that not only equalize the distribution of fiber linear density but also straighten the fibers and lay them parallel to the product axis. Consequently, they replace the machines eliminated from technological lines and contribute to the improvement in the quality of intermediate products and yarns. Using an example of the cotton combed spinning system, the article presents the analysis of the possibilities of using a short-term autoleveller with a modified operation algorithm that takes into account the phenomenon of sliver retardation after the process of short-term regulation. The regulation of draft was used before and after combing. The quality parameters of slivers used for feeding roving frames or rotor spinning machines were analyzed.

3

A quick, reliable, and economic method for evaluating the properties of rotor-spun yarn

Das D., Ishtiaque S. M., Mac T., Veit D., Gries T.

Autex Research Journal

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2004

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Vol. 4, no. 3

123--128

EN

An attempt has been made to evaluate the primary and secondary properties of blended rotor-spun yarn both quickly and reliably from only a small sample of fibre. The concept of the quickspin system of yarn production is partially utilised in this research work. The natural and synthetic fibres are blended in a 50/50 ratio according to five different methods on an Uster Micro Dust and Trash Analyser 3 (MDTA 3), and the best blending method is evaluated with the help of a suitable image analysis technique. Furthermore, the reliability of rotor-spun yarns produced from MDTA 3 slivers with conventionally produced rotor-spun yarns from card and draw-frame slivers has been checked in terms of their properties.

4

Tensile Strength of Untwisted Blended Cotton/Flax Fibre Streams

Jackowski T., Chylewska B., Cyniak D., Czekalski J.

Fibres & Textiles in Eastern Europe

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2003

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Vol. 11, no. 3 (42)

21--24

EN

An estimation of the tensile strength of untwisted blended cotton/flax fibre streams with flax content from 10% up to 50% was carried out. Slivers with a linear density of 3 ktex after the second drawing machine were the objects of investigation. The tensile strength tests were carried out with the use of a tension tester by means of the static method in accordance with Polish Standard PN-88/P-04771. The results obtained were compared with the results obtained by the means of dynamic method with the use of the F 460 Stick-Slip Friction Tester apparatus.

PL

Przeprowadzono ocenę wytrzymałości na rozciąganie taśm mieszankowych bawełna/ len o udziale procentowym lnu od 10 do 50%. Przedmiot badań stanowiły taśmy po drugiej rozciągarce. Masa liniowa taśm wynosiła 3 ktex. Badanie wytrzymałości taśm przeprowadzono zgodnie z normą PN-88/P-04771 metodą statyczną na zrywarce. Otrzymane wyniki porównano z uzyskanymi z metody dynamicznej przy zastosowaniu aparatu „Stick-Slip Friction Tester F460".

5

Spectral Analysis of the Mass Irregularity of Slivers Using Uster Tester 3

Germanova-Krasteva D.

Fibres & Textiles in Eastern Europe

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2003

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Vol. 11, no. 3 (42)

25--27

EN

A method of calculation for determining the spectral characteristics of wavelengths and amplitudes of assessed sliver irregularities has been developed. Spectrograms from the Uster Tester 3 apparatus for irregularity measurement were utilised. The absolute and relative amplitude values were determined. A common formula for fast amplitude calculation is proposed.

PL

Opracowano metodę obliczeniową dla określania charakterystyki spektralnej długości fal i wielkości amplitud nierównomierności masy liniowej taśm. Dla celów metody wykorzystywane są spektrogramy pochodzące z aparatu lister Tester 3, służącego do pomiaru masy liniowej. Metoda pozwala na określanie bezwzględnych i względnych wartości amplitud. Zaproponowano postępowanie dla szybkiego obliczania wartości amplitud.

6

Factors Influencing Nep and Trash Transfer from the Sliver to the Rotor Yarn

Frydrych I., Matusiak M.

Fibres & Textiles in Eastern Europe

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2002

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Vol. 8, no. 4 (39)

16--19

EN

Färber proposed the coefficient j to describe the nep and trash number; these are transferred to the yarn and identified as neps by the Uster tester in the sliver which feeds the OE spinning frame. In the Institute of Textile Architecture we have carried out research on the rotor spinning process, whose aim was to analyse the phenomenon of nep and trash transfer from the feeding sliver to the yarn, and to identify factors which influence the coefficient j value. On the basis of an analysis of yarn characteristics from the Uster tester and sliver parameters from the AFIS system, this was stated as follows. In addition to the linear density of yarn, the manner of sliver preparation and the technical shape of the spinning points influence the value of coefficient j which describes nep and trash transfer from the feeding sliver to the yarn.

PL

Współczynnik ø został zaproponowany przez Färbera dla opisu ilości nopów i zanieczyszczeń. Są one przenoszone do przędzy i identyfikowane jako nopy przez aparat Ustera w taśmie zasilającej przędzarkę bezwrzecionową. W Instytucie Architektury Tekstyliów przeprowadzono badania procesu przędzenia rotorowego, których celem była analiza zjawiska przenoszenia nopów i zanieczyszczeń z taśmy zasilającej do przędzy i identyfikacja czynników wpływających na wartość współczynnika ø . Na podstawie analizy charakterystyk przędzy z aparatu Ustera i parametrów przędzy uzyskanych dzięki systemowi AFIS, można było stwierdzić, że nie tylko masa liniowa przędzy, ale również sposób przygotowania taśmy i konstrukcja techniczna punktów przędzących wpływają na wartość współczynnika ø, charakteryzującego przenoszenie nopów i zanieczyszczeń z taśmy do przędzy.