The Properties of Polymeric Films and Their Influence on the Dimensional Stability of Woven Pile Constructions

Jhangiani, Sunder Bulchand (1963) The Properties of Polymeric Films and Their Influence on the Dimensional Stability of Woven Pile Constructions. MSc(R) thesis, University of Glasgow.

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Though it was realised that size pastes did not form true film layers on the back of the carpet, yet it was thought that evaluation of film characteristics might throw some light on the actual behaviour of protective coatings in carpet backing. For this reason, physical properties of films of various sizing mixes have been investigated. Thin films suitable for mechanical testing were obtained by evaporation of size pastes on "Perspex" trays. The methods used included the determination of tensile strength, extensibility, bending length, flexural rigidity and flexing strength of size films. In order to study the relationship between above characteristics of free films of sizing mixes and characteristics of size films when applied to carpets, various Spool Axminster structures were back-sized on a small scale back-sizing unit. The latter was especially designed and constructed in the Department to meet the requirements of the present work. The properties of the carpets investigated, as a measure of efficiency of back-sizing agents, included determination of tuft withdrawal force and stiffness characteristics in the unfinished and sized states. Determinations of these characteristics were also extended for sized worn carpets. For wear treatment of sized carpet samples "Booking Tetrapod" machine was employed. This was necessary because it was realised that true value of any sizing mix could not be evaluated until its resistance to wear was known. The property of increase in tuft withdrawal force with any particular mix after wear has been shown to have some bearing on both the tensile and flexing strength of free size films of that mix. In this respect, a new method of approach has been suggested. However, no relation has been found between stiffness characteristics of various sized carpets and those of free size films. In addition, viscosity characteristics of various sizing mixes have been studied under varied shear rate conditions and temperatures. For this purpose, "Ferranti Portable Viscometer" was employed. It has been shown that viscosity of the size mix changes with variation in shear rate conditions and temperatures. It has, therefore, been suggested that for process control, viscometer should be capable of providing reliable readings under varied shear conditions. The variation of viscosity with temperature established the importance of temperature control in the back-sizing process.

Item Type: Thesis (MSc(R))
Qualification Level: Masters
Keywords: Polymer chemistry, Textile research
Date of Award: 1963
Depositing User: Enlighten Team
Unique ID: glathesis:1963-79475
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 05 Mar 2020 09:07
Last Modified: 05 Mar 2020 09:07

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