Remedial Measure to Improve Tear Strength of Cellulosic Material

摘要

The utility function that fabrics should fulfil depends first of all on their end use. Woven/knitted fabrics have a very wide range of applications. Such a wide range of application means that, during their lifetime, fabrics undergo actions from different forces and strains, depending on their end use. They can be stretched in one direction or many directions, torn or compressed. An important feature of cellulosic fibres is chemical stability, enabling them to withstand degradation, with its consequential loss of strength, under normal conditions of processing. Even a slight deviation in processing may lead to unacceptable loss of strength and other undesirable effects. In general, different treatments that may lead to degradation are: exposure to acids, alkalis, oxidizing agents, resins, enzymes, heat and radiation. Under certain circumstances, cellulose can also be degraded mechanically. The degradation of cellulose by aqueous acid results in hydrolysis of glycosidic linkages, which varies with acid concentration, temperature and time of treatment. The glycosidic linkages in cellulose can also be attacked during kier boiling, where a temperature as high as 140℃ can cause a loss of tensile strength.