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Dependence of Structural Characteristics of Polyamide Textured Yarns on the Parameters of the False Twist Yarn Texturing Process

Trajković D., Savic M., Kostic M., Majstorovic D., Stojanovic P., Stepanovic J.

Fibres & Textiles in Eastern Europe

2017

Vol. 25, no. 3 (123)

79--85

In the false twist texturing process, due to the action of mechanical forces and heat, a disorientation of structural elements happens at all levels of the supramolecular structure. These changes are related to changes in the texturing parameters and mechanical properties of yarn. In this paper, investigated is the effect of technical-technological texturing parameters in the false twist texturing process on the structure of PA6.6 yarns. POY multifilament PA6.6 with a fineness of 22f07x1 dtex was used as experimental material. The yarn was textured on a friction texturing machine - ICBT model FT 15 E3. The exiting yarn speed (Vi) changed as 600, 700, 800 and 900 m/min; the heater temperature (T) was 200, 210 and 220 °C, and the ratio of the disk surface speed to the linear yarn speed (D/Y) was 1.9 and 2.1. The values of strain were kept constant at 1.305 (tension in texturing zone) and 0,954 in the winding zone. Analysed were the density, degree of crystallinity, degree of orientation, single filament diameter, the content of -NH2 and -COOH end groups, and the total content of end groups. From the results obtained it can be seen that the effect of the heater temperature is more significant than that of Vi and D/Y on the structural characteristics analysed. Analysing the experimental results it was found that linear positive correlations were established between the texturing speed and end (-NH2) groups, the texturing speed and end (-COOH) groups and the texturing speed and the total content of end groups. The correlation factor between the process parameters and yarn structural characteristics analysed is determined.

W procesie teksturowania, w wyniku działania sił mechanicznych i wysokich temperatur, ma miejsce dezorientacja elementów strukturalnych. W pracy zbadano wpływ parametrów technicznych i technologicznych procesu teksturowania na strukturę przędzy poliamidowej. Jako materiał doświadczalny zastosowano multifilamentowy PA6.6 POY. Zastosowano trzy prędkości wyjściowe przędzy: 600, 700, 800 i 900 m/min, a temperatura ogrzewania wynosiła 200, 210 i 220 °C. Analizowano gęstość, stopień krystaliczności, stopień orientacji, średnicę poszczególnych filamentów, zawartość grup końcowych -NH2 i -COOH oraz całkowitą zawartość grup końcowych. Na podstawie uzyskanych wyników stwierdzono, że na analizowane właściwości strukturalne ma większy wpływ temperatura, niż prędkości wyjściowych przędzy. Po analizie wyników badań określono współczynnik korelacji między parametrami procesu a analizowanymi cechami strukturalnymi przędzy.

Fibrous systems with programmed biological-activity and their application in medical practice

Skundric P., Medovic A., Kostic M.

Autex Research Journal

2002

Vol. 2, no. 2

78--84

An effective two-stage method for obtaining both biologically activated fibres with antibacterial and anaesthetic activity and biologically activated complex fibres -insulin as an artificial store of insulin has been developed. The first stage involves the formation of reactive functional groups by chemical modification, followed by the second stage where the fibres are modified with chemotherapeutic agent solutions. This paper presents the results of obtaining biologically activated fibres with antibacterial and anaesthetic activity as well as an artificial store of insulin in the form of complex ion-exchanged fibre-insulin. The level of immobilisation of the drug in the antibacterial fibre amounts to 140 mg of gentamicin sulphate per 1 g of fibres, in the anaesthetic fibre 180 mg of procaine hydrochloride per 1 g of fibres, and in the fibrous store of insulin 800 mg of insulin per 1 g of fibres.