Physico-chemical Analytical Techniques for Evaluation of Polyester Heatsetting

Abstract

A polyester fabric has been heatset in an industrial plant over a wide range of temperatures (160-220°C) to study the influence of this variable in the modification of the fine structure produced hy this thermal treatment. For this purpose, the weft of (he fabric has been characterised through physico-chemical tests such as critical dissolution time, differential solubility and iodine sorption. The heatsetting effective temperature has heen determined by differential scanning calorimetry and the crystallinity calculated from density measurements in a density gradient column. Both parameters have been correlated. The fine structure parameters deduced from the above mentioned techniques have heen correlated with the effective temperatures of heatsetting.

Microstructure variations of polylactide fibres with texturing conditions

“…The more compacted (crystalline) and the more ordered (orientation) the microstructure, the lower the iodine sorption due to the decrease in the fibre free volume. The fact that iodine sorption is considerably influenced by the microstructure of the textured fibres is corroborated by the results [2][3][4][5][6][7] . Differential solubility Differential solubility increases with testing temperature.…”

“…The higher the intensity of the thermal treatment, the lower the differential solubility. Relationship between microstructure measured by iodine sorption and/or differential solubility and the different processing variables have been studied for polyester [3][4][5][6] and polyamide fibres 7,8 . In this paper, both methods are applied to textured polylactide (PLA) substrates.…”

Modification of the fine structure of heat‐set polyester on dyeing at high temperature

“…The fine structure of the substrate heat-set at different temperatures has been reported in a previous study [4]. The same thermal treatment has also been applied in the absence of dye ('blind' dyeing) in order to establish the influence of the dye on the fine structure of the dyed substrates.…”

“…In several previous papers the authors have discussed the modification of the fine structure of polyester (PET) fibre caused by heat-setting, usually the most intense of the thermal treatments applied to this fibre during its processing [1][2][3]. The fine structure of the treated fibre has been evaluated by measuring its density (crystallinity) and by differential scanning colorimetry, in order to arrive at the optimum temperature of the thermal treatment.…”

The Influence of Annealing Process on Crystallinity and Structural Properties of Cotton/Spandex Fabric

“…Heat-setting (annealing) procedure, seen as an essential issue, is undertaken during the initial phase of the textile industry, considering the fact that it proffers the appropriate product's output to make it appropriate for additional steps and for the customer to utilise it [1,2]. Heat-setting, based on the report of Karmaker can be defined as a treatment that helps in imparting shape retention and crease resistance, as well as resilience and elasticity to the fibres, and also in causing change in strength and stretchability, as well as in softness dyeability, together with in crystalline structure, and in some occasions, on the material colour [3,4].…”