ISSN:
1435-1536
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Description / Table of Contents:
Summary The properties of textiles from PET fibres are decisively depending on the stresses set within the material. According to the thermal stability of molecular interactions these stresses can be released by thermal treatments at different temperatures. As a consequence of stress release the material shrinks. Informations on the stresses built in can be achieved by following up the development of contraction force (shrinkage force) as a function of temperature when heating the fibres under constant length. By variation of heating rates retarded stress development and stress relaxation are observed. In this case the real set tensions due to prior treatments are not recorded. A new modified technique of measuring shrinkage forces provides in certain intervals of temperature an alteration of the clamped lengths by a minute stretching or shrinking of the fibres in a manner resulting a zero force deviation. So at each temperature we have an equilibrium of the released inherent stresses of the fibres and the recorded ones. These socalled equilibrium-shrinkage-force-curves are capable of describing the state of order of PET-fibres in a better way than other methods do. It will be shown that the formerly developed parameters of a heat treatment „effective temperature” and “effective tension” (8) can be derived from these curves as well as those tensions which had been set up in the fibres during cooling and processing or relaxed during storage.
Notes:
Zusammenfassung Es wird eine modifizierte Schrumpfkraft-Meßmethode, die sog. Gleichgewichtsschrumpfkraft-Messung, vorgestellt, die sich besonders informativ und schnell zur vollständigen Beschreibung des inneren Spannungszustandes von Fasern und Garnen eignet. An zwei praktischen Beispielen aus dem Bereich der Struktur-Eigenschafts-Beziehungen von PES-Fasern werden einige mit dieser neuen Meßtechnik gewonnene Versuchsergebnisse diskutiert. Eine Automatisierung des Meßablaufes ist durchaus möglich, was z. Z. realisiert wird.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01404170
Permalink
