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3 Zeszyty Naukowe. Włókiennictwo / Politechnika Łódzka

3 2000

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Tensile behaviour of acrylic fibres and yarns: influence of the textile manufacturing process

Manich A. M., Ussman M., Bosch T., Castellar de M. D.

Zeszyty Naukowe. Włókiennictwo / Politechnika Łódzka

2000

z. 59

135-143

Vonnel Acrylic fibres from FISIPE were submitted to textile manufacturing from row material to dyed yarns. Changes on tensile behaviour along the manufacturing process have been monitorised through viscoelastic modelling using the modified Vangheluwe model. Sonic Modulus on yarns has been also measured and differences from raw to dyed acrylic yarns can be seen and they are in accordance with changes in the model parameters.

Measuring flax elementarisation

Castellar de M. D., Ussman M., Bosch T., Manich A. M.

Zeszyty Naukowe. Włókiennictwo / Politechnika Łódzka

2000

z. 59

211-217

Flax fibres from Celitex have been obtained using a conventional line in Spain. Measurements have been made after tearing and carding. The same fibre has been processed in the Technical University of Lodz and measurements have been made also after tearing, carding and cottonized fibre. Values of fineness and length measured using Image analysis, water absorption and thermal behaviour by DSC are reported on this paper. Some relationships are studied.

Characterisation of polyacrylonitrile yarns by thermal analysis

Bosch T., Manich A. M., Ussman M., Carilla J.

Zeszyty Naukowe. Włókiennictwo / Politechnika Łódzka

2000

z. 59

145-152

Six polyacrylonitrile yarns of different linear density were characterised by both differential scanning calorimetry and thermomechanical analysis. The DSC technique, when working with a sealed pan, showed a step-like change around 80°C, which was associated with a glass-transition temperature, and a small cold crystallisation peak around 200°C. The DSC thermograms, when working with perfored pans, showed a single glass transition temperature around 95°C in the cooling scan (210 -0°C) and two breaks of the slope in the range 85-105°C in the reheating curve (0-210°C). The TMA scan exhibited two thermal transitions at ≈ 95°C and ≈ 160 °C. The former was very reproducible and was identified with the step-like change observed in the DSC scan. The latter was not very reproducible and, as with the DSC exothermic peak, seemed to be affected by the linear density of the yarn.