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The roles of polymer relaxation phenomena, aqueous dye solubility and the physical properties of water in the mechanism of adsorption of a disperse dye on poly(ethylene terephthalate) fibres : Part 4 further aspects related to polymer relaxation phenomena / Stephen M. Burkinshaw in COLORATION TECHNOLOGY, Vol. 139, N° 5 (10/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 5 (10/2023) . - p. 493-506 Titre : The roles of polymer relaxation phenomena, aqueous dye solubility and the physical properties of water in the mechanism of adsorption of a disperse dye on poly(ethylene terephthalate) fibres : Part 4 further aspects related to polymer relaxation phenomena Type de document : texte imprimé Auteurs : Stephen M. Burkinshaw, Auteur ; K. Liu, Auteur Année de publication : 2023 Article en page(s) : p. 493-506 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Adsorption Colorants -- Solubilité Colorants dispersés Catégorie de colorants très peu solubles dans l'eau, utilisés à l'origine comme colorants pour l'acétate, et qui généralement sont appliqués sous forme de suspensions aqueuses de faible concentration.Les colorants dispersés sont largement utilisés dans la teinture de la plupart des fibres manufacturées, surtout le polyester. Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Phénomènes de relaxation (matériaux) Polyamide 66 Polyéthylène téréphtalate Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : To further investigate the contribution of polymer relaxation times to the mechanism of disperse dye adsorption on poly(ethylene terephthalate) fibres, the temperature-dependent uptake of Teratop Yellow HL-G 150% on both cotton and polyamide 66 fabrics at temperatures between 30 and 130°C was compared with that on poly(ethylene terephthalate) fabric. Although uptake of the commercial grade dye on polyester fabric is governed by the thermally regulated, broad glass transition of the water-saturated poly(ethylene terephthalate) substrate, as this was not observed for either cotton or nylon 66 fabrics, the respective cellulose or polyamide 66 polymer glass transition does not present a major thermal impediment to dye uptake over the wide range of dyeing temperatures used. This is because the onset and end-set temperatures of the glass transition of the water-plasticised poly(ethylene terephthalate) material reside within the range of dyeing temperatures employed, whereas those of the water-plasticised cotton and polyamide materials occur below the lowest dyeing temperature examined (30°C). The thermal dependency of disperse dye solubility also likely makes a meaningful contribution to the temperature-dependent dye uptake observed for each type of fibre. Note de contenu : - Adherence of dye uptake on cotton and PA 66 fabrics to the free volume model of dye diffusion - Similarity of dye uptake on cotton and PA 66 fabrics - Correlation of colour strength data obtained for cotton and PA 66 with that secured for PET fabric - Influence of polymer glass transition on dye uptake - Influence of dye solubility - Table 1 : Values of Tg reported for various textile fibres/polymers,9-17 as well as corresponding values of ΔTg - Table 2 : Solubility/mg l−1 of purified disperse dyes in commercial dispersing agent and in water DOI : https://doi.org/10.1111/cote.12672 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12672 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39830 [article]

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Surfactant screening techniques for effective dispersion of carbon black pigment / Bhagyesh Chavan in COLORATION TECHNOLOGY, Vol. 139, N° 5 (10/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 5 (10/2023) . - p. 507-518 Titre : Surfactant screening techniques for effective dispersion of carbon black pigment Type de document : texte imprimé Auteurs : Bhagyesh Chavan, Auteur ; Swati Nagose, Auteur ; Elvina Rose, Auteur ; Amit Joshi, Auteur Année de publication : 2023 Article en page(s) : p. 507-518 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact Criblage Dispersions et suspensions Mouillage (chimie des surfaces) Noir de carbone Pigments Surfactants Index. décimale : 667.3 Teinture et impression des tissus Résumé : Effective dispersion of a pigment in a colour concentrate is imperative to its performance. A well dispersed pigment yields the true strength of a colour and becomes stabilised in the long run. To accomplish this, a suitable chemistry of the surfactant is a prerequisite for dispersion and stabilisation of the pigment. A plethora of surfactants are available commercially and it is very difficult to choose the right surfactant that suits the pigment chemistry. Carbon black, being difficult to disperse, was chosen in this study to provide dispersion from an effective surfactant. Simple screening processes, if available for these surfactants, can save a huge amount of time and energy compared with the conventional method of conducting individual experiments. This paper discusses the development of such simple surfactant screening techniques, which could make the selection process simpler and quicker. Note de contenu : - EXPERIMENTAL : Pigment selection - Surfactant screening techniques - Final scores of surfactants - ASSESSMENT OF SURFACTANT SCREENING METHODS : Wetting by contact angle - Particle size - Long-term stability - Surfactant adsorptio by TGA - Table 1 : Characterisation of carbon black pigment - Table 2 : Details of surfactants used in the study - Table 3 : Surfactant affiniti towards the pigment by the penetration method - Table 4 : Pigment wetting by capillary action - Table 5 : Composition for pigment - Table 6 : Dispersion check on filter paper - Table 7 : Score of surfactants on light absorption - Table 8 : Score of surfactants - Table 9 : Final scores of surfactants - Table 10 : Contact angles of carbon black pigment with the shortlisted DOI : https://doi.org/10.1111/cote.12667 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12667 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39831 [article]

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Exhaust dyeing of meta-aramid yarn at low temperature and time / Komal Kukreja in COLORATION TECHNOLOGY, Vol. 139, N° 5 (10/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 5 (10/2023) . - p. 519-526 Titre : Exhaust dyeing of meta-aramid yarn at low temperature and time Type de document : texte imprimé Auteurs : Komal Kukreja, Auteur ; Prasanta K. Biswas, Auteur Année de publication : 2023 Article en page(s) : p. 519-526 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Colorants -- Absorption Colorants cationiques Diméthylsulfoxyde Essais (technologie) Fibre aramide Fibres textiles -- Propriétés mécaniques Solidité de la couleur Teinture -- Fibres textiles synthétiques Teinture par épuisement Index. décimale : 667.3 Teinture et impression des tissus Résumé : Exhaust dyeing of aramid fibre is difficult due to its high crystalline and compact structure. In this study aramid yarn is pre-treated with solvent dimethyl sulphoxide to facilitate the dyeing process and then dyeing is achieved with a cationic dye. Pre-treatment at high temperature leads to the reduction in tensile strength of yarn which is not desirable. Therefore, in this work pre-treatment has been carried out at different temperatures and time to standardise those parameters to enhance the dye uptake with minimum reduction in strength. Further, dyeing temperature and time has been standardised keeping the standard pre-treatment parameters fixed. From the study, pre-treatment temperature of 30°C for 10 min and dyeing temperature of 100°C for 30 min are found suitable for better colour strength without much compromising on strength of yarn. The fastness properties of untreated and treated dyed yarns were comparable. Note de contenu : - MATERIAL AND METHOD - RESULTS AND DISCUSSION : Effect of pre-treatment time and temperature on mechanical properties of yarn - Characterisation of DMSO treated samples - Effect of dyeing temperature and dyeing time on colour strength - Colour fastness testing of dyed meta-aramid yarn samples - Table 1 : Meta-aramid yarn pre-treated at temperature 90°C - Table 2 : Meta-aramid yarn pre-treated for15 min - Table 3 : Meta-aramid yarn pre-treated for temperature 30°C - Table 4 : Average diameter and standard deviation of meta-aramid yarn - Table 5 : Crystallinity percentage in untreated and treated meta-aramid yarn DOI : https://doi.org/10.1111/cote.12669 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12669 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39832 [article]

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Development of polycaprolactone-based electrospun pH-sensitive sensors as instant colorimetric indicators for food packaging / Nihal Guclu in COLORATION TECHNOLOGY, Vol. 139, N° 5 (10/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 5 (10/2023) . - p. 527-543 Titre : Development of polycaprolactone-based electrospun pH-sensitive sensors as instant colorimetric indicators for food packaging Type de document : texte imprimé Auteurs : Nihal Guclu, Auteur ; Sebnem Duzyer Gebizli, Auteur ; Mehmet Orhan, Auteur Année de publication : 2023 Article en page(s) : p. 527-543 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aliments -- Emballages -- Aspect sanitaire Anthocyanes Capteurs chimiques Caractérisation Colorimétrie Electrofilature Essais dynamiques Mouillabilité Nanofibres pH -- Mesure Poly-e-caprolactone Polyéthylène glycol Solutions (chimie) Textiles et tissus synthétiques Traction (mécanique) Index. décimale : 667.3 Teinture et impression des tissus Résumé : In the present study, polycaprolactone/polyethylene glycol (PCL/PEG) electrospun nanofibres with different anthocyanin (1%, 2%, 3%, and 5%) were fabricated for the instant measurement of pH, especially for applications—such as food freshness detection—where quick response is required. The solution, surface, chemical, thermal, wettability, mechanical, and release properties of the samples were evaluated by viscosity measurements, scanning electron microscopy (SEM), Fourier-transform infrared (FTIR), contact angle measurements, and tensile tests, respectively. The colorimetric analyses were also investigated against the solutions at different pH values and bacterial solutions. Finally, the on-site performance of the sensor was evaluated. Anthocyanin addition initially lowered the solution viscosity, resulting in thinner fibres with a diameter of 288 nm. The diameters were increased up to 395 nm with the increasing anthocyanin. Anthocyanin addition enhanced the wettability and the mechanical properties, and the contact angles decreased to 43°. The highest modulus was observed for 1% anthocyanin, with a value of 6.162. The release experiments revealed that the anthocyanin-loaded samples released a large amount of anthocyanin (between ~12% and 38%) in the first 15 s. The colorimetric analyses showed that PCL/PEG nanofibre mats with 2% and 3% anthocyanin concentrations were the most capable pH-sensitive sensors for detecting pH changes from 2 to 8. As a result, it can be concluded that 3% anthocyanin is the threshold value for the production of the anthocyanin-loaded nanofibre mats, and these structures are promising for the instant detection of pH proved by the on-site application. Note de contenu : - MATERIALS AND METHODS - RESULTS AND DISCUSSION : Solution characterisation - Nanofibre characterisation - Tensile tests - Release experiments - The pH response and colorimetric analyses - The pH response against bacterial solutions - On-site application - Table 1 : Electrospinning parameters - Table 2 : Solution characterisation and average diameters of the nanofibre mats - Table 3 : Elemental analyses of the nanofibre mats - Table 4 : FTIR spectra of PCL and PEG - Table 5 : FTIR spectrum of anthocyanin - Table 6 : Mechanical properties of the nanofibre mats - Table 7 : Colour changes of the nanofibre mats depending on different pH values - Table 8 : Colour changes of the nanofibre mats depending on bacterial growth DOI : https://doi.org/10.1111/cote.12701 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12701 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39833 [article]

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Colorimetric sensing of H2PO4- using a Pb2+ complex of a pyridylazo dye in aqueous solution / Mahiro Shimizu in COLORATION TECHNOLOGY, Vol. 139, N° 5 (10/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 5 (10/2023) . - p. 544-551 Titre : Colorimetric sensing of H2PO4- using a Pb2+ complex of a pyridylazo dye in aqueous solution Type de document : texte imprimé Auteurs : Mahiro Shimizu, Auteur ; Shunichi Aikawa, Auteur ; Yasumasa Fukushima, Auteur Année de publication : 2023 Article en page(s) : p. 544-551 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Capteurs chimiques Colorants Colorimétrie Phosphate dihydrogène Le dihydrogène phosphate est un ion inorganique de formule H2PO4. Les phosphates sont largement présents dans les systèmes naturels. (Wikipedia) Produits chimiques -- Détection Solutions aqueuses (chimie) Index. décimale : 547.86 Colorants et pigments Résumé : This study develops a sensitive and selective colorimetric probe for the detection of dihydrogen phosphate (H2PO4-) based on a lead ion (Pb2+) complex of a commercially available pyridylazo dye (PAPS) in aqueous media under physiological conditions. The complex was made by adding Pb2+ to PAPS in a 1:1 stoichiometric ratio (PAPS-Pb2+), which was accompanied by the remarkable solution change from yellow to purple. The colorimetric sensing of H2PO4- over other anions with PAPS-Pb2+ occurred owing to the regeneration of original PAPS by the interaction of H2PO4- with Pb2+ in a 1:2 molar ratio. Moreover, the H2PO4- detection was less affected by the presence of other coexisting competitive anions. The colorimetric naked-eye behaviour of PAPS-Pb2+ rendered a useful and convenient probe for the detection of H2PO4- via the indicator displacement assay. Note de contenu : - Materials and instrumentation - Absorption spectral study - Table 1 : Comparison of various colorimetric chemosensors reported for dihydrogen phosphate (H2PO4) detection - Table 2 : Determination of hydrogen phosphate (HOPO4) in water samples DOI : https://doi.org/10.1111/cote.12671 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12671 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39834 [article]

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A novel and eco-friendly approach for dyeing polyester / Manman Zheng in COLORATION TECHNOLOGY, Vol. 139, N° 5 (10/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 5 (10/2023) . - p. 552-564 Titre : A novel and eco-friendly approach for dyeing polyester Type de document : texte imprimé Auteurs : Manman Zheng, Auteur ; Yi Sun, Auteur ; Changlong Li, Auteur ; Yinhui Lu, Auteur ; Yingqi Dai, Auteur ; Zongqian Wang, Auteur Année de publication : 2023 Article en page(s) : p. 552-564 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bleu (couleur) Caractérisation Chlorure de choline Colorants dispersés Catégorie de colorants très peu solubles dans l'eau, utilisés à l'origine comme colorants pour l'acétate, et qui généralement sont appliqués sous forme de suspensions aqueuses de faible concentration.Les colorants dispersés sont largement utilisés dans la teinture de la plupart des fibres manufacturées, surtout le polyester. Ethylène glycol Eutectiques Un eutectique est un mélange de deux corps purs qui fond et se solidifie à température constante, contrairement aux mélanges habituels. Il se comporte en fait comme un corps pur du point de vue de la fusion. C'est aussi le point du diagramme (mélange avec une proportion donnée) pour lequel le mélange est à sa température minimale en phase liquide. Cette température est propre à chaque mélange. Fibres polyesters Résistance à l'abrasion Rouge (couleur) solvants Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : Disperse dyes do not contain water-soluble groups and are difficult to dissolve in water, so they cannot be directly formulated into dyeing liquor. In the current dyeing process, the solubility of disperse dyes is mainly improved by adding dispersants. However, dispersants are not absorbed by fibres and survive in the dyeing effluent, aggravating the pollution of water bodies and causing difficulties in treatment. Therefore, the development of a novel, eco-friendly dyeing approach is important to overcome these problems. Herein, for the purpose of improving the solubility of disperse dyes and reducing the dosage of dispersants, a deep eutectic solvent consisting of choline chloride/ethylene glycol was employed instead of dispersant to dissolve CI Disperse Blue 79 and CI Disperse Red 343, thus forming liquid disperse dyes. The results show that both CI Disperse Blue 79 and CI Disperse Red 343 were well dissolved in choline chloride/ethylene glycol with excellent stability, and the dissolution behaviour was strongly associated with the dissolution temperature and time. Moreover, polyester fabrics can be dyed successfully with liquid disperse dyes, and it was observed that the K/S value and rubbing fastness were evidently improved at the same dyeing temperature with unchanged colour characteristics, and a higher K/S value could still be obtained by lowering the dyeing temperature. This work establishes a green dyeing process, which reduces dyeing costs and meets the demand for environmental protection. It is also expected to realise the liquid state of disperse dyes, which will help to promote the further development of textile dyeing. Note de contenu : - EXPERIMENTAL : Materials - Preparation of choline chloride/ethylene glycol - Preparation of liquid disperse dyes - Dyeing of polyester fabrics - Micromorphology and size of the dye particles - Fourier Transform-infrared spectroscopy of dyes - Absorption spectrum and stability of liquid disperse dyes - Permeability of dyes - Dyeing spectrum and rubbing fastness - RESULTS AND DISCUSSION : Synthesis and characterisation of choline chloride/ethylene glycol - Dissolution behaviour of disperse dyes in choline chloride/ethylene glycol - Effects of choline chloride/ethylene glycol dissolution on the particle size and micromorphology of dyes - Effects of choline chloride/ethylene glycol dissolution on the chemical structure of disperse dyes - Effects of choline chloride/ethylene glycol dissolution on the dyeing properties of disperse dyes - Proposed dyeing process and mechanism of liquid disperse dyes - Table 1 : Colour uniformity and rubbing fastness of dyed polyester fabrics DOI : https://doi.org/10.1111/cote.12673 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12673 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39835 [article]

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Study of the dyeing properties of saffron and ultrafiltrated saffron powders, as colourants for natural and synthetic fibres / Panagiotis Naidis in COLORATION TECHNOLOGY, Vol. 139, N° 5 (10/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 5 (10/2023) . - p. 565-577 Titre : Study of the dyeing properties of saffron and ultrafiltrated saffron powders, as colourants for natural and synthetic fibres Type de document : texte imprimé Auteurs : Panagiotis Naidis, Auteur ; Smaro Lykidou, Auteur ; Magdalini Mischopoulou, Auteur ; Evangelia Vouvoudi, Auteur ; Nikolaos F. Nikolaidis, Auteur Année de publication : 2023 Article en page(s) : p. 565-577 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Propriétés tinctoriales Colorimétrie Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Isotherme d'adsorption Laine Polyamide 66 Polyesters Safran et constituants Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : There is a noticeable growing interest in the use of natural dyes in contemporary textile dyeing, motivated by the requirements imposed, in favour of environmental prosperity. The use of natural dyes reduces significantly both the energy requirements and the environmental impact of the process. In the present work natural and synthetic fibres were dyed with the dyestuff isolated from Crocus sativus L., after aqueous extraction of the dried stigmas of the plant. Additionally, part of the powder was purified by using ultrafiltration technology. The saffron extract and the ultrafiltrated saffron retentate were used to dye cotton, wool, nylon and polyester, in various depths of shade and temperatures. Both saffron and ultrafiltrated saffron successfully dyed not only the natural substrates, but also the synthetic ones, while higher dyeing temperatures produced level dyeing with all substrates used. Ultrafiltrated saffron powder produced brighter and much stronger dyeing to the original saffron powder, due to the elimination of extraction by-products. Isothermal adsorptions for both colourants were performed on all substrates in order to investigate their adsorption mechanism. It was found that saffron and ultrafiltrated saffron follow a Freundlich-type adsorption isotherm on cotton, wool and nylon which is a typical mechanism for a planar-directed dye of big molecular weight. Nernst-type adsorption was found to occur on polyester which again is typical for the adsorption of disperse dyes on polyester. Thus, saffron can be claimed as a universal dye, able to successfully dye natural and synthetic substrates. Note de contenu : - EXPERIMENTAL PART : Material preparation - Ultrafiltration (UF) - Dyeing procedure - Determination of dye exhaustion - Colour measurements - Spectral recordings - RESULTS AND DISCUSSION : FTIR and UV-visible characterisation - Study of the dyeing behaviour of saffron and UF-saffron - Influence of dyeing temperature on the exhaustion of saffron and UF-saffron - Adsorption isotherms of saffron and UF-saffron - Essential perspectives in saffron dyeing - Table 1: Colorimetric indicators for all four substrates dyed with saffron and UF-saffron at 4% owf DOI : https://doi.org/10.1111/cote.12670 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12670 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39836 [article]

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Investigation of the clean patterning possibilities on cotton socks through laser technology / Riza Atav in COLORATION TECHNOLOGY, Vol. 139, N° 5 (10/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 5 (10/2023) . - p. 578-595 Titre : Investigation of the clean patterning possibilities on cotton socks through laser technology Type de document : texte imprimé Auteurs : Riza Atav, Auteur ; Sevda Köksal Daban, Auteur ; Erdogan Cetin, Auteur Année de publication : 2023 Article en page(s) : p. 578-595 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption Chaussettes Collants (textile) Colorants réactifs Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Elasthanne Fibres polyesters Lasers -- Applications industrielles Teinture -- Fibres textiles Index. décimale : 667.9 Revêtements et enduits Résumé : The aim of this research is to reveal the effect of laser treatment at different resolutions (10, 20 and 30 dpi) and pixel times (80, 100 and 120 μs) on reactive dye uptake of cotton fabrics and the fastness values obtained. Yellowness index, Fourier Transform–infrared analysis, scanning electron microscopy analysis and bursting strength tests were applied to samples. The samples treated with laser were dyed in lighter shades than the untreated ones, with all three of the reactive dyes used in the experiments. In general, colour yield values decreased when the resolution and pixel time increased. However, no significant change was observed in washing, rubbing, light and perspiration fastness values. The possibilities of obtaining various patterns on cotton socks dyed with reactive dyes by laser treatment at different resolutions and pixel times were also investigated. According to the results, it was determined that if laser treatment was not applied to some parts of reactive dyed cotton socks, and 10 dpi 100 μs and 20 dpi 100 μs laser was applied to other parts of those socks, then it was possible to obtain patterns with different shades of the same colour on the socks. On the other hand, laser application after dyeing does not have a negative effect on fastness values. After determining the optimum conditions for the laser process, non-see-through tights were produced with cotton yarn on the front and polyester/elastane yarn on the back, and patterns were obtained by applying laser treatment before or after dyeing via sample scale industrial production. Note de contenu : - MATERIALS AND METHODS : - Effect of laser treatment on the dyeability of cotton socks with reactive dyes - Obtaining patterns on reactive dyed cotton socks with laser - Obtaining patterns on tights produced by the sock knitting technique with a laser before or after reactive dyeing in sample scale industrial production - Tests and analysis - RESULTS AND DISCUSSION : - Results regarding the effect of laser treatment on the dyeability of cotton socks with reactive dyes - Results related to obtaining patterns on reactive dyed cotton socks with a laser - Results related to obtaining patterns on tights produced by the sock knitting technique with laser treatment before or after reactive dyeing in sample scale industrial production DOI : https://doi.org/10.1111/cote.12668 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12668 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39837 [article]

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Colour stability during production of printed ocular prostheses / Ethan Bunker in COLORATION TECHNOLOGY, Vol. 139, N° 5 (10/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 5 (10/2023) . - p. 596-609 Titre : Colour stability during production of printed ocular prostheses Type de document : texte imprimé Auteurs : Ethan Bunker, Auteur ; Algy Kazlauciunas, Auteur ; Thimothy Zoltie, Auteur ; Emma Walshaw, Auteur ; Paul Bartlett, Auteur ; Tom Archer, Auteur ; Taras Gout, Auteur Année de publication : 2023 Article en page(s) : p. 596-609 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse de variance En statistique, l'analyse de la variance (terme souvent abrégé par le terme anglais ANOVA : ANalysis Of VAriance) est un ensemble de modèles statistiques utilisés pour vérifier si les moyennes des groupes proviennent d'une même population. Les groupes correspondent aux modalités d'une variable qualitative (p. ex. variable : traitement; modalités : programme d'entrainement sportif, suppléments alimentaires ; placebo) et les moyennes sont calculés à partir d'une variable continue (p. ex. gain musculaire). Ce test s'applique lorsque l'on mesure une ou plusieurs variables explicatives catégorielles (appelées alors facteurs de variabilité, leurs différentes modalités étant parfois appelées "niveaux") qui ont de l'influence sur la loi d'une variable continue à expliquer. On parle d'analyse à un facteur lorsque l'analyse porte sur un modèle décrit par un seul facteur de variabilité, d'analyse à deux facteurs ou d'analyse multifactorielle sinon. (Wikipedia) Colorimétrie Couleurs -- Stabilité Impression numérique Polyacryliques Prothèses oculaires Statistiques Index. décimale : 535.6 Couleur Résumé : Ocular prostheses have been used for centuries to restore patient confidence, psychosocial relationships and to improve quality of life. Methodology for producing accurate prostheses has improved with technological discoveries. Recently, hand painting ocular prostheses has been the go-to method for creating life like prostheses. However, digital printing a print to envelope around an acrylic prosthesis has been shown to decrease treatment and rehabilitation times, whilst still producing high-definition ocular prostheses. Despite these improvements, little is known about the colour stability of digitally printed ocular prostheses. To better understand the colour stability of digital prostheses 30 samples simulating ocular prostheses were created, containing 10 with blue iris, 10 combination/green iris and 10 with sepia (brown) irises. Colour measurements were taken using a data spectrophotometer, from two defined points, the iris and sclera for both pre-polymerisation and post-polymerisation to assess colour variance. Colour coordinate data was gathered and was analysed using a one-way analysis of variance test and a paired t-test, both with alpha = 0.05. Significant colour variations were found for each iris colour and for the sclera. The sclera showed the largest colour variation with a ΔE of 4.75, followed by the brown irises, the green irises and then blue irises with ΔE values of 3.29, 2.47 and 1.82, respectively. This is a significant decrease compared to current hand painting methods which have an average colour variance of ΔE = 20. This shows a large increase in colour stability which can drastically improve patient satisfaction and quality of life. Note de contenu : - INTRODUCTION : History of ocular prostheses - Hand-painted acrylic ocular prostheses (HPAOP) - Digitally-printed acrylic ocular prostheses (DPAOP) - Production of acrylic ocular prostheses - RESEARCH OBJECTIVES - SCOPE OF STUDY - PROCEDURES : Participants - Simulated ocular prosthesis synthesis - Colour measurement procedure - Statistical analysis - RESULTS AND DISCUSSION : Reflectance data - Grayscale - Colour analysis-CIELab - Paired t-test analysis - Literature comparison - ANOVA - Table 1 : Grayscale mean ratings given for the sclera, brown iris, green iris and blue iris. These ratings are means across all prostheses - Table 2 : Table showing mean CIELab colour coordinates for each iris colour and the mean sclera - Table 3 : The t stat values for the paired t-test used to determine statistical significance pre-polymerisation and post-polymerisation - Table 4 : The total colour difference for each iris colour and the sclera. The data is expressed as the mean (standard deviation) - Table 5 : The ANOVA test results DOI : https://doi.org/10.1111/cote.12674 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12674 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39838 [article]

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Investigation into the development of novel lanthanide-based luminescent colorants for application to textiles and paper materials / David M. Lewis in COLORATION TECHNOLOGY, Vol. 139, N° 5 (10/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 5 (10/2023) . - p. 610-620 Titre : Investigation into the development of novel lanthanide-based luminescent colorants for application to textiles and paper materials Type de document : texte imprimé Auteurs : David M. Lewis, Auteur ; Peter J. Broadbent, Auteur ; M. L. A. Rigout, Auteur ; C. M. Carr, Auteur ; C. C. Seaton, Auteur ; T. Swift, Auteur Année de publication : 2023 Article en page(s) : p. 610-620 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bleu (couleur) Colorants -- Synthèse Impression jet d'encre Impression sur étoffes Impression sur papier Luminescence Luminophores Métaux des terres rares Rouge (couleur) Structure chimique Vert Index. décimale : 667.3 Teinture et impression des tissus Résumé : This article describes the synthesis and application of lanthanide-based luminophores for visualisation under short wavelength ultraviolet (UV) activation (typically 254 nm). Luminophores are chemical compounds which re-emit light of longer wavelength than typical fluorescence and phosphorescence, following photoexcitation, because of efficient energy transfer from the ligands to the lanthanide ion emission levels. The luminophores described in this article are all derived from europium and terbium metal complexes and cover the complete colour gamut. Selection of appropriate ligands allows for water solubility or water insolubility (if required pigment or disperse “dye” applications). Similar to dyeing or printing processes, the anionic complexes can be applied to polyamide fibres or to cellulosic fibres, whereas dispersions of the non-ionic complexes are suitable for polyester or cellulose acetate fibre application. The water-soluble derivatives are also suitable for ink-jet printing and the water-insoluble derivatives are suitable for lithographic or intaglio paper printing. The novel complexes are excited by radiation below 300 nm and thus cannot be activated by sunlight (the earth's atmosphere prevents light below about 300 nm reaching the surface). Accordingly, the photo-stability of the dyed materials and prints obtained is excellent. These materials could be used in security marking applications, for example bank-notes and passports, where they could replace the current fluorophores that are rendered visible under near UV light (typically 365 nm) illumination but exhibit relatively poor photo-stability. The development of an RGB (red, green and blue) colour palette for inkjet printing based on these innovative luminophores will significantly support the design of digitally printed security features. Note de contenu : - EXPERIMENTAL : Materials - Long-liquor application methods - Ink-jet printing with water-soluble luminophores - K-Bar imaging and offset printing - Luminescence viewing - Light-fastness assessment - Chemical structure analysis - RESULTS AND DISCUSSION : Preparation of red water-soluble europium complex luminophores - Preparation of water-soluble green terbium(III) complex luminophores - Preparation of blue water-soluble europium(III) complex luminophores - Synthesis of water insoluble red luminophore pigment - Synthesis of water insoluble green luminophore pigment - Synthesis of water insoluble blue luminophore pigment - Structures of luminophores - Application of luminophores to textile substrates - Paper printing DOI : https://doi.org/10.1111/cote.12675 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12675 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39839 [article]

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