NOPR Collection:

An Assessment of the Characteristics of Medullated and Non-medullated Wool Fibres

Mon, 01 Jun 1981 00:00:00 GMT

Title: An Assessment of the Characteristics of Medullated and Non-medullated Wool Fibres Authors: Gupta, N P; Arora, R K; Verma, G K Abstract: Study of the physical and mechano-chemical properties of pure, hetero and hairy fibres has indicated that the presence of medullated fibres in different wool breeds is the main factor responsible for the higher average micron and linear density values. The loss in strength on alkali and acid treatment is more in the case of hetero and hairy fibres than for pure fibres. Page(s): 92-95

Studies in Sublimation Transfer Print Process: Part III-Fastness Ratings of Non-ionic Dyes on Polyester

Mon, 01 Jun 1981 00:00:00 GMT

Title: Studies in Sublimation Transfer Print Process: Part III-Fastness Ratings of Non-ionic Dyes on Polyester Authors: Darye, Keshav V Abstract: Twelve commercial disperse dyes were transferred from filter paper to polyester staple fabric and polyester-cotton (66:33) blend fabric by the sublimation transfer print process. The wash fastness, light fastness and sublimation fastness of the printed samples were recorded before and after the conventional reduction clear-washing treatment. It has been found that the fastness to washing and light is not affected, while the fastness to sublimation appears to improve by the after treatment. Page(s): 90-91

Dissolution of Polyfunctional Reactive Dyed Cotton in Cadoxen Solvent

Mon, 01 Jun 1981 00:00:00 GMT

Title: Dissolution of Polyfunctional Reactive Dyed Cotton in Cadoxen Solvent Authors: Achwal, W B; Abhyankar, P N Abstract: The kinetics of dissolution of polyfunctional reactive dyeings has been studied and found to be different from that of bifunctional reactive dyeings. For cotton dyed with polyfunctional reactive dyes, the initial faster rate of dissolution was followed by an extremely slow rate and the samples did not dissolve completely even after 24 hr. The initial rate of dissolution of cotton dyed with bifunctional reactive dyes was very slow and was followed by a higher rate and completes dissolution in 24 hr. In the case of polyfunctional dyeings, the activation energy at the faster rate of dissolution was 7-8 kcal/mole, suggesting that the disruption of hydrogen bond is the governing factor for dissolving the non crosslinked fraction. At the extremely slow rate of dissolution, activation energy was 19-20 kcal/mole, which is similar to that for bifunctional dyeings, indicating that dissolution involves disruption of crosslinks. The difference in the behaviours of poly- and bifunctional reactive dyeings has been explained on the basis of higher alkali stability of the dye-fibre bond and the larger size of crosslinks in the former case. The method of application of dyes has also been found to have an effect on the extent of dissolution, as it influences the state of swelling of the fibre at the time of formation of crosslinks. Page(s): 85-89

Effect of Filament Characteristics and Processing Variables on the Characteristics of Air Textured Nylon 6 Filament Yarn

Mon, 01 Jun 1981 00:00:00 GMT

Title: Effect of Filament Characteristics and Processing Variables on the Characteristics of Air Textured Nylon 6 Filament Yarn Authors: Bose, C; Govindarajulu, R Abstract: Nylon 6 multifilament yarns were air textured in a laboratory scale air texturing unit. Parameters like pre-twist, overfeed and air pressure were varied and their effects on yarn characteristics, such as percentage increase in linear density, loop size and frequency, percentage physical bulk, percentage instability and tenacity were evaluated. The data were statistically analyzed for the effect of variables on yarn characteristics. Percentage increase in linear density, loop frequency, percentage physical bulk and percentage instability increase with increase in air pressure, while loop size and tenacity decrease. With increase in pre-twist level, percentage increase in linear density, loop frequency and percentage physical bulk increase, while loop size and tenacity decrease. Percentage instability decreases first and then increases with increase in pre-twist. Page(s): 80-84