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Attention-based vector quantisation variational autoencoder for colour-patterned fabrics defect detection / Hongwei Zhang in COLORATION TECHNOLOGY, Vol. 139, N° 3 (06/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 3 (06/2023) . - p. 223-238 Titre : Attention-based vector quantisation variational autoencoder for colour-patterned fabrics defect detection Type de document : texte imprimé Auteurs : Hongwei Zhang, Auteur ; Guanhua Qiao, Auteur ; Shuting Liu, Auteur ; Yuting Lyu, Auteur ; Le Yao, Auteur ; Zhiqiang Ge, Auteur Année de publication : 2023 Article en page(s) : p. 223-238 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Auto-encodeurs variationnels En apprentissage automatique, un auto-encodeur variationnel (ou VAE de l'anglais variational auto encoder), est une architecture de réseau de neurones artificiels introduite en 2013 par D. Kingma et M. Welling, appartenant aux familles des modèles graphiques probabilistes et des méthodes bayésiennes variationnelles. Les VAE sont souvent rapprochés des autoencodeurs en raison de leur architectures similaires. Leur utilisation et leur formulation mathématiques sont cependant différentes. Les auto-encodeurs variationnels permettent de formuler un problème d'inférence statistique (par exemple, déduire la valeur d'une variable aléatoire à partir d'une autre variable aléatoire) en un problème d'optimisation statistique (c'est-à-dire trouver les valeurs de paramètres qui minimisent une fonction objectif). Ils représentent une fonction associant à une valeur d'entrée une distribution latente multivariée, qui n'est pas directement observée mais déduite depuis un modèle mathématique à partir de la distribution d'autres variables. Bien que ce type de modèle ait été initialement conçu pour l'apprentissage non supervisé, son efficacité a été prouvée pour l'apprentissage semi-supervisé et l'apprentissage supervisé. (Wikipedia) Détection de défauts (Ingénierie) Textiles et tissus -- Défauts Index. décimale : 667.3 Teinture et impression des tissus Résumé : Defect detection is an essential link in the fabric production process. Due to the diversity of patterns and scarcity of defect samples for colour-patterned fabrics, reconstruction-based unsupervised deep learning algorithms have received extensive attention in the field of fabric defect detection. Among them, unsupervised reconstruction models based on variational autoencoders (VAEs) have been shown to be effective. However, there is a problem of posterior collapse in the process of modelling parametric distributions of continuous variables by VAEs. Therefore, VAE-based defect detection methods for colour-patterned fabrics usually produce ambiguous reconstruction results, thereby affecting the defect detection performance. In this article, an attention-based vector quantisation variational autoencoder (AVQ-VAE) is proposed for colour-patterned fabric defect detection. The method adopts autoregressive modelling of discrete variables to avoid the posterior collapse problem of traditional VAEs, and utilises attention mechanism to enhance the feature representation ability of the model. AVQ-VAE consists of encoder, embedding space, decoder and attention mechanism. The encoder is used to map the input image into multiple feature vectors. Vector quantisation in embedding space is used for discretisation and autoregressive modelling of feature vectors. A decoder is used to decode discrete variables into images of the same size as the original input. Furthermore, an attention mechanism is used to capture channel and spatial correlations, which help the model focus on important information by adaptively recalibrating feature maps. Experimental results on public datasets demonstrate that the proposed method is robust and effective for colour-patterned fabric defect detection. Note de contenu : - RELATED WORKS : Unsupervised deep learning based fabric defect detection - VAE-based model - Attention mechanism - THE PROPOSED AVQ-VAE METHOD : AVQ-VAE and training process - Colour-patterned fabric defect detection based on AVQ-VAE - EXPERIMENT : Experimental platform - Datasets - Parameter setting - Evaluation metrics - Defect detection results on dataset YDFID-1 - Defect detection results on anomaly detection dataset MVTec AD - Table 1 : Number of selected YDFID-1 patterns - Table 2 : Defect detection results of six models on colour-patterned fabrics - Table 3 : AUROC results for the three methodsTABLE 4. AUPRO results for the three methods DOI : https://doi.org/10.1111/cote.12644 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12644 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39534 [article]

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Usability of cellulose-based binder in water-based flexographic ink / Sinan Sonmez in COLORATION TECHNOLOGY, Vol. 139, N° 3 (06/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 3 (06/2023) . - p. 239-247 Titre : Usability of cellulose-based binder in water-based flexographic ink Type de document : texte imprimé Auteurs : Sinan Sonmez, Auteur ; Abdus Salam, Auteur ; Paul D. Fleming III, Auteur ; Alexandra Pekarovicova, Auteur ; Qingliu Wu, Auteur Année de publication : 2023 Article en page(s) : p. 239-247 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules. Encre flexographique Formulation (Génie chimique) Liants en phase aqueuse Index. décimale : 667.3 Teinture et impression des tissus Résumé : Packaging must have a good commercial appearance and is generally obtained by ink transferred to its substrate. It is important that the ink used in packaging printing is produced from environmentally friendly and sustainable raw materials as well as being suitable for the printing system. The increasing demand in the field of printed packaging and the scarcity of resources to meet this demand have accelerated the search for new sources for inks. For this purpose, inks produced in the laboratory using a modified cellulose-based binder, a commercial acrylic resin and a commercial soybean protein were compared with a commercial ink. As a result of the study, it was determined that the printability properties of the ink obtained by using the modified cellulose-based binder were better than the ink obtained with commercial soybean protein. It was determined that it showed printability properties close to the ink produced with commercial acrylic binders. By using modified cellulose-based water-based flexographic ink instead of other commonly used binders, more environmentally friendly sustainable inks can be produced. Note de contenu : - METHODOLOGY AND MATERIAL : Ink formulation - Printing conditions - RESULTS AND DISCUSSION : Print density - Print contrast - Specular gloss - The CIE L*a*b* colour values and ΔE - Tone value increases (TVIs) - Dot roundness - Print topography and mottle - Table 1 : Optical and physical properties of a commercial SBS board - Table 2 : Pigment dispersion physical and chemical properties - Table 3 : ProSoy powders physical and chemical properties - Table 4 : Soy vehicle formulation - Table 5 : A standard water-based flexographic ink formulation - Table 6 : Print density of test samplesTABLE 7. Print contrast of test samples - Table 8 : Specular gloss of test samples - Table 9 : The CIE L*a*b* colour values of test samples - Table 10 : Dot measurements of 15% screen dots - Table 11 : Print topography and mottle properties of test samples DOI : https://doi.org/10.1111/cote.12643 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12643 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39535 [article]

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A contrastive learning-based attention generative adversarial network for defect detection in colour-patterned fabric in COLORATION TECHNOLOGY, Vol. 139, N° 3 (06/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 3 (06/2023) . - p. 248-264 Titre : A contrastive learning-based attention generative adversarial network for defect detection in colour-patterned fabric Type de document : texte imprimé Année de publication : 2023 Article en page(s) : p. 248-264 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Apprentissage contrastif Détection de défauts (Ingénierie) Textiles et tissus -- Défauts Textiles et tissus teints Index. décimale : 667.3 Teinture et impression des tissus Résumé : The pattern style of colour-patterned fabrics is varied. Defective fabric samples are scarce in the production of small batches of colour-patterned fabrics. Therefore, the unsupervised defect-detection method for colour-patterned fabric has attracted wide attention. Several unsupervised defect-detection methods for colour-patterned fabrics based on convolutional neural networks have been proposed. However, convolutional neural network methods cannot learn long-range semantic information interaction well because of the intrinsic locality of convolution operations. Besides, as the number of layers in the convolutional neural network increases, the feature maps become more and more complex. Convolutional neural networks experience difficulties in coordinating numerous parameters and extracting key features from complex feature maps. Both these problems reduce the accuracy of the model for detecting defects in colour-patterned fabrics. In this paper, we propose a Contrastive Learning-based Attention Generative Adversarial Network (CLAGAN) for defect detection in colour-patterned fabrics. The CLAGAN possesses two important parts: contrastive learning and a channel attention module. Contrastive learning captures long-range dependencies by calculating the cosine similarity between different features. The channel attention module assigns different weights to each channel of the feature maps, and it enables the model to extract key features from those feature maps. The experimental results verified the effectiveness of the CLAGAN. It obtained values of 38.25% for intersection over union and of 51.67% for the F1-measure on the YDFID-2 public dataset. Note de contenu : - RELATED WORKS : Fabric defect-detection methods based on deep learning - Contrastive learning - Attention mechanism - THE PROPOSED CLAGAN MODEL : An overview of the CLAGAN - Defect detection in colour-patterned fabric based on the CLAGAN - RESULTS AND DISCUSSION : Datasets - Evaluation metric - Implementation detail - Experimental results and analysis - Table 1 : The number of colour-patterned fabric samples - Table 2 : Quantitative detection results for different methods on the YDFID-1 dataset - Table 3 : Quantitative detection results for different methods on the ZJU-Leaper dataset - Table 4 : Experimental results for the noise fraction - Table 5 : Experimental results for the ablation study DOI : https://doi.org/10.1111/cote.12642 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12642 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39536 [article]

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Natural weathering of spruce wood chemically modified by re-used e-caprolactone solution / Merve Cambazoglu in COLORATION TECHNOLOGY, Vol. 139, N° 3 (06/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 3 (06/2023) . - p. 265-275 Titre : Natural weathering of spruce wood chemically modified by re-used e-caprolactone solution Type de document : texte imprimé Auteurs : Merve Cambazoglu, Auteur ; Eylem Dizman Tomak, Auteur ; Mahmut A. Ermeydan, Auteur Année de publication : 2023 Article en page(s) : p. 265-275 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse morphologique Bois -- Conservation Colorimétrie Epicéas et constituants Hydrophobie Poly-e-caprolactone Rugosité Index. décimale : 674.1 Texture, propriétés, types de bois de Résumé : Increasing environmental pressures over the last few years have led to attention for non-biocide treatments in the wood protection field. The ε-caprolactone modification of wood by substitution or blocking of hydroxyl groups with hydrophobic poly(ε-caprolactone) (PCL) is one of the novel modification methods developed in recent years. In this study, ring-opening polymerisation of ε-caprolactone in wood cell walls was evaluated by the third and sixth re-use of recovered monomer and by oven-curing method. Spruce samples were modified by re-used ε-caprolactone and exposed to the natural weathering agents for 12 months. After weathering, the colour change, surface roughness measurements, and macroscopic and ultra-microscopic observations revealed that the modified wood had better surface properties than reference wood. Fourier-transform infrared (FTIR) analysis proved that PCL could be found on the weathered surface up to the sixth month, but very little amount was detected on the surfaces with a longer weathering period. The results clearly showed that the efficiency of PCL modification with re-use of the monomer solution was sufficient during the initial weathering periods, but efficiency was reduced after a prolonged exposure period. Note de contenu : - MATERIALS AND METHODS : Materials - Poly(ε-caprolactone) (PCL) modification - Natural weathering - Colour and surface roughness measurement - Fourier-transform infrared (FTIR) analysis - Morphological analysis by scanning electron microscopy (SEM) - RESULTS AND DISCUSSION : Weight percentage gain (WPG) and volume change (VC) of the samples - Colour changes after the natural weathering test - Surface chemistry analysis after the natural weathering test - Surface roughness changes after the natural weathering test - Table 1 : Weight percentage gain (WPG) and volume change (VC) of samples after the modification process - Table 2 : Intensity ratio of cellulose (899 cm−1) and lignin (1508 cm−1) related bands during weathering DOI : https://doi.org/10.1111/cote.12645 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12645 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39537 [article]

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The effects of heat treatment temperatures on photocatalytic activity of cobalt ferrite nanoparticles synthesised by microwave-assisted combustion method / Ibrahim Hakki Karakas in COLORATION TECHNOLOGY, Vol. 139, N° 3 (06/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 3 (06/2023) . - p. 276-293 Titre : The effects of heat treatment temperatures on photocatalytic activity of cobalt ferrite nanoparticles synthesised by microwave-assisted combustion method Type de document : texte imprimé Auteurs : Ibrahim Hakki Karakas, Auteur ; Zeynep Karcioglu Karakas, Auteur Année de publication : 2023 Article en page(s) : p. 276-293 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Colorants -- Oxydation Eaux usées -- Epuration Eaux usées -- Teneur en colorants Ferrite de cobalt Nanoparticules Photocatalyse Traitement thermique Index. décimale : 667.3 Teinture et impression des tissus Résumé : In this study, the effects on the photocatalytic activities of particles after heat treatment has been applied to cobalt ferrite nanoparticles produced by microwave-assisted combustion method were observed. The heat treatment applied to the samples was produced with only the microwave effect, at temperatures ranging from 300 to 1000°C. Thermogravimetric analysis was performed on the precursor sample in air atmosphere. During this analysis, the gases released up to 1200°C were identified with a Fourier-transform infrared (FTIR) spectrometer integrated into a thermogravimetric analysis system. Then, the cobalt ferrite nanoparticles produced with heat treatments applied at various temperatures were used as a photocatalyst to remove the dyestuff content in synthetic wastewaters prepared by using Astrazon Red GTL textile dye by photocatalytic oxidation, and their photocatalytic activities were compared. In these experiments, the operational parameters for photocatalysis processes were applied as 400 rpm for stirring speed, 50 mg/L for initial contaminant concentration, 0.5 g/L for catalyst dosage, 25°C for temperature, and 4400 μW/cm2 for light intensity. As a result of the experiments, it was observed that the crystal structure of the cobalt ferrite nanoparticles produced with the increase of the applied heat treatment temperature improved significantly. The obtained data show a strong relationship between the structural properties of materials and their photocatalytic activities. In addition, it was determined that the dyestuff in the solution was completely degraded in the experiments, and it was determined that all processes were compatible with the pseudo-first-order kinetic model. Note de contenu : - EXPERIMENTAL : Preparation of materials - Synthesis method - General properties of Astrazon Red GTL textile dye - Characterisation of the samples - RESULTS AND DISCUSSION : Effects on structural properties of the heat treatment temperature - Evaluation of thermal stability of cobalt ferrite nanoparticles - Effects on morphological properties of the heat treatment temperature - Effects on magnetic properties of the heat treatment temperature - Effects on photocatalytic activities of the heat treatment temperature - The effect of UV irradiation on removal efficiency - Reaction kinetics - Table 1 : Average particle sizes and lattice parameters calculated from X-ray diffraction (XRD) results for cobalt ferrite nanoparticles subjected to heat treatment at various temperatures - Table 2 : Various magnetic characteristics calculated from the hysteresis curves of cobalt ferrite nanoparticles prepared with heat treatment applied at different temperatures - Table 3 : Calculated removal efficiencies and rate constants for photocatalysis experiments performed with samples produced by heat treatments applied at different temperatures DOI : https://doi.org/10.1111/cote.12647 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12647 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39538 [article]

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Colorimetric sensor based on polymeric thin film for arsenic quantitation using colour response calibration / Saowanee Toonchue in COLORATION TECHNOLOGY, Vol. 139, N° 3 (06/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 3 (06/2023) . - p. 294-305 Titre : Colorimetric sensor based on polymeric thin film for arsenic quantitation using colour response calibration Type de document : texte imprimé Auteurs : Saowanee Toonchue, Auteur ; Nakara Bhawawet, Auteur ; Apichat Imyim, Auteur Année de publication : 2023 Article en page(s) : p. 294-305 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse quantitative (chimie) Capteurs chimiques Chimie analytique Colorimétrie Etalonnage Index. décimale : 545 Analyse quantitative Résumé : A simple, low-cost and portable sensor for colorimetric determination of As(III) was developed. The sensing is carried out using a microcentrifuge tube as a mini-reactor, where an Fe(III)-1,10-phenanthroline doped polyvinyl alcohol thin film is cast on the underside of the cap. Once Fe(III)-1,10-phenanthroline is reduced by arsine gas generated in situ from As(III), yielding the Fe(II)-1,10-phenanthroline complex, the red coloured product can be detected using colour analysis software. The As(III) content is then determined based upon the colour intensity of Fe(II)-1,10-phenanthroline on the film. Experimental conditions were optimised, and parameters affecting the complex formation and arsenic speciation were investigated. The method developed proved to be a selective colorimetric sensor for As(III). More significantly, the device could be directly used to detect As(III) in the field without any sample preparation requirements. The recovery for industrial wastewater and groundwater was found to be 97.5%-104.0%. Hence, the thin film-based test kit is easy to operate, portable and practical for the measurement of As(III) in the field. Note de contenu : - EXPERIMENTAL : Materials and apparatus - Film preparation and characterisation - Sensing system and colour parameter processing - Optimisation of the sensing system - Precision study - Colour response calibration - Interference study and real sample analysis - RESULTS AND DISCUSSION : Film characterisation - Optimisation of the sensing system - Precision study - Colour response calibration - Interference study and real samples analysis - Table 1 : Results of determination of spiked As(III) in water samples using the proposed method compared with the standard method - Table 2 : Comparison of the proposed method with alternative methods for on-site colorimetric detection for arsenic DOI : https://doi.org/10.1111/cote.12646 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12646 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39539 [article]

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Waterless dyeing of polylactic acid with disperse dyes using decamethylcyclopentasiloxane as medium / Jianguo Wu ; Guojie Ma ; Qufu Wei in COLORATION TECHNOLOGY, Vol. 139, N° 3 (06/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 3 (06/2023) . - p. 306-313 Titre : Waterless dyeing of polylactic acid with disperse dyes using decamethylcyclopentasiloxane as medium Type de document : texte imprimé Auteurs : Jianguo Wu, Auteur ; Guojie Ma, Auteur ; Qufu Wei, Auteur Année de publication : 2023 Article en page(s) : p. 306-313 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Décaméthylcyclopentasiloxane Fibres textiles -- Propriétés mécaniques Fibres textiles -- Propriétés tinctoriales Polylactique, Acide L'acide polylactique (anglais : polylactic acid, abrégé en PLA) est un polymère entièrement biodégradable utilisé dans l'alimentation pour l'emballage des Å“ufs et plus récemment pour remplacer les sacs et cabas en plastiques jusqu'ici distribués dans les commerces. Il est utilisé également en chirurgie où les sutures sont réalisées avec des polymères biodégradables qui sont décomposés par réaction avec l’eau ou sous l’action d’enzymes. Il est également utilisé pour les nouveaux essais de stent biodégradable. Le PLA peut-être obtenu à partir d'amidon de maïs, ce qui en fait la première alternative naturelle au polyéthylène (le terme de bioplastique est utilisé). En effet, l'acide polylactique est un produit résultant de la fermentation des sucres ou de l'amidon sous l'effet de bactéries synthétisant l'acide lactique. Dans un second temps, l'acide lactique est polymérisé par un nouveau procédé de fermentation, pour devenir de l'acide polylactique. Ce procédé conduit à des polymères avec des masses molaires relativement basses. Afin de produire un acide polylactique avec des masses molaires plus élevées, l'acide polylactique produit par condensation de l'acide lactique est dépolymérisé, produisant du lactide, qui est à son tour polymérisé par ouverture de cycle. Le PLA est donc l’un de ces polymères, dans lequel les longues molécules filiformes sont construites par la réaction d’un groupement acide et d’une molécule d’acide lactique sur le groupement hydroxyle d’une autre pour donner une jonction ester. Dans le corps, la réaction se fait en sens inverse et l’acide lactique ainsi libéré est incorporé dans le processus métabolique normal. On obtient un polymère plus résistant en utilisant l'acide glycolique, soit seul, soit combiné à l’acide lactique. Résistance à la traction Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : Polylactic acid (PLA) fibre as a new generation of eco-friendly polyester fibre is expected to substitute polyethylene terephthalate (PET) fibre to be an important textile fibre raw material. However, there exist severe strength loss and light dyeing colour by the traditional water bath dyeing method, which seriously affect the promotion and application of PLA fibre in the textile fields. Therefore, it is necessary to study waterless dyeing method for PLA. Decamethylcyclopentasiloxane (D5) possesses excellent physical and chemical properties with the characteristics of odourless, non-flammable, and stable to various chemicals, which has been studied to be used as a waterless dyeing medium for PET fabric. In this study, D5 was selected as the medium to study the waterless dyeing process and properties for PLA. The effects of disperse dye dosage, dyeing temperature, dyeing time and liquor ratio on the dyeing properties of PLA fabric were investigated. The results showed that the optimal dyeing process conditions were as follows: the dye dosage was 4%, dyeing temperature and time were 120°C and 40 min, respectively, and the liquor ratio was 1:10. Then PLA was dyed by three different colour disperse dyes using the optimal process which were compared with the traditional water bath. The results showed that the properties of dyed PLA fabrics with D5 could reach the dyeing effect of the traditional water bath method, while causing less influence on its mechanical property. Therefore, this research proved that D5 can be used as a dyeing medium for PLA fabric to substitute the traditional water bath dyeing. Note de contenu : - EXPERIMENTS : Materials - Dyeing process - Characterisation - RESULTS AND DISCUSSION : Effect of the dye dosage on PLA dyeing properties - Effect of the dyeing temperature on PLA dyeing properties - Effect of dyeing time on PLA dyeing property - Effect of the liquor ratio on PLA dyeing properties - Comparison of PLA dyeing in D5 and traditional water bath - Table 1 : Dyeing properties and tensile strength of polylactic acid (PLA) zipper tapes with different dye dosages - Table 2 : Dyeing properties and tensile strength of polylactic acid (PLA) zipper tapes with different dyeing temperatures - Table 3 : Dyeing properties and tensile strength of polylactic acid (PLA) zipper tape with different dyeing times Effect of the liquor ratio on PLA dyeing properties - Table 4 : Dyeing properties and tensile strength of polylactic acid (PLA) zipper tapes with different liquor ratios Comparison of PLA dyeing in D5 and traditional water bath - Table 5 : Dyeing properties and tensile strength of polylactic acid (PLA) zipper tape using decamethylcyclopentasiloxane (D5) medium and water bath DOI : https://doi.org/10.1111/cote.12652 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12652 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39540 [article]

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Prediction of the photofading of 1-H or 1-ethyl derivatives of 3-cyano-6-hydroxy-4-methyl-5-(p-X-phenylazo)-2-pyridone dyes and their azo-hydrazone tautomerism: A theoretical study / Krzysztof Wojciechowski in COLORATION TECHNOLOGY, Vol. 139, N° 3 (06/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 3 (06/2023) . - p. 314-329 Titre : Prediction of the photofading of 1-H or 1-ethyl derivatives of 3-cyano-6-hydroxy-4-methyl-5-(p-X-phenylazo)-2-pyridone dyes and their azo-hydrazone tautomerism: A theoretical study Type de document : texte imprimé Auteurs : Krzysztof Wojciechowski, Auteur ; Lucjan Szuster, Auteur Année de publication : 2023 Article en page(s) : p. 314-329 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Détérioration Colorants azoïques Orbitales moléculaires Photodétérioration Prévision, Théorie de la Index. décimale : 667.3 Teinture et impression des tissus Résumé : The lightfastness calculations for photofading of monoazo pyridone dyes were performed. For this purpose, all-valence molecular orbital method PM3 was applied. Frontier electron density distribution on the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) was examined. The obtained parameters seem to reflect the tendency for an electrophilic attack with a singlet oxygen (1O2) atom or a nucleophilic attack with superoxide anion (O2●─) on a particular atom in a molecule. Reactivity indicators for superdelocalisability ( ) and electron density distribution in ground and excited state were calculated. Superdelocalisabilities enable the fastness values to be explained in different chemical molecules depending on tautomeric forms in which they may occur. DOI : https://doi.org/10.1111/cote.12649 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12649 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39541 [article]

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Effects on print quality of varying acrylic binder types in water-based flexographic ink formulations / Sinan Sonmez in COLORATION TECHNOLOGY, Vol. 139, N° 3 (06/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 3 (06/2023) . - p. 330-337 Titre : Effects on print quality of varying acrylic binder types in water-based flexographic ink formulations Type de document : texte imprimé Auteurs : Sinan Sonmez, Auteur ; Dania Alsaid, Auteur ; Alexandra Pekarovicova, Auteur ; Paul D. Fleming III, Auteur ; Matthew T. Stoops, Auteur Année de publication : 2023 Article en page(s) : p. 330-337 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cyan Le cyan est, par définition, la couleur primaire complémentaire du rouge, dans la synthèse soustractive des couleurs utilisée en photographie argentique en couleurs et en imprimerie. Encre en phase aqueuse Encre flexographique Formulation (Génie chimique) Liants en phase aqueuse Polyacryliques Index. décimale : 667.3 Teinture et impression des tissus Résumé : The ink industry is one of the world's largest markets due to the increasing demand for printing inks for the packaging industry. Flexography printing is a well-known promising technology for large-area printing due to its high printing speed and roll-to-roll capability to print economically on a variety of surfaces and is used in nearly in all areas of packaging printing. Water-based inks are considered non-toxic, odourless, and more environmentally friendly options compared to solvent-based inks. Therefore, in this article, the goal was to develop new water-based ink formulation with different acrylic binders for flexographic printing on commercial solid bleached sulphate (SBS) board. Five inks were formulated with four different acrylic binders and compared to a commercially available ink to study their performance. The developed inks were investigated with regard to their print qualities and print characteristics. It was found that the binder type influenced some print quality while the effect was not significant for others. Using flexography printed cyan inks, the ink formulated with the highest molecular weight had the lowest print density and the largest tonal value increase (TVI) observed between 40 and 60 tone values. The same ink had the largest mottle values and variation in topography. For values of print contrast and delta gloss at 75°, although differences were observed between average values, data had inconclusive variation and spread around averages, where no conclusive trends or effects of acrylic binder type on these response factors were observed. Print chroma and dot roundness results were equally close for all printed samples. Note de contenu : - Ink formulation - Printing conditions - Table 1 : The optical and physical properties of solid bleached sulphate (SBS) board - Table 2 : The physical and chemical properties of pigment dispersion - Table 3 : The chemical properties of acrylic resins used in ink formulations - Table 4 : A standard water-based flexographic ink formulation - Table 5 : The CIE L*a*b* colour values of printed test samples - Table 6 : Print topography and mottle properties of printed test samples - Table 7 : Dot measurements of 15% screen dots of printed test samples - Table 8 : Print rub resistance properties of printed test samples DOI : https://doi.org/10.1111/cote.12650 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12650 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39542 [article]

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Mechanism and application of ozone fading: Oxidative decolorisation of disperse dyes and waste-dyed polyester fabrics / Jiangfei Lou in COLORATION TECHNOLOGY, Vol. 139, N° 3 (06/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 3 (06/2023) . - p. 338-349 Titre : Mechanism and application of ozone fading: Oxidative decolorisation of disperse dyes and waste-dyed polyester fabrics Type de document : texte imprimé Auteurs : Jiangfei Lou, Auteur ; Lamei Ren, Auteur ; Jiugang Yuan, Auteur ; Jing Xu, Auteur ; Zhengbiao Gu, Auteur ; Xuerong Fan, Auteur Année de publication : 2023 Article en page(s) : p. 338-349 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bleu (couleur) Caractérisation Colorants -- Oxydation Décoloration Fibres textiles -- Surfaces Mesure Orange (couleur) Ozone Polyesters Textiles et tissus teints Index. décimale : 667.3 Teinture et impression des tissus Résumé : As the most common synthetic fibre, polyester has consistently been in high demand and usage, but its recycling has always been a problem for the textile industry. The decolorisation of dyed polyester is the key to expanding its recycling use, and there is no rapid, effective and simple decolorisation method. In this study, ozone was used to decolorise dispersed dyes developed for polyester. Ozone was effective in decolorising CI Disperse Orange 30 and CI Disperse Blue 60, and the process was extended to the decolorisation of dyed polyester fabric. Based on single factor analysis, the optimum decolorisation technological conditions were: an ozone feed rate of 130 mg L−1 min−1, treatment time of 2 hours, wet pick-up of 100% and pH value of 3, with which the decolorisation rate and colour difference values could exceed 45% and 6%, respectively. The changes in dye structure during the process of ozone decolorisation were analysed using scanning electron microscopy, X-ray diffraction and Fourier Transform–infrared spectroscopy, and the mechanism of ozone decolorisation was also investigated. The results showed that the crystallinity decreased from 41.18% to 36.30% with a strength retention rate of above 80%, and demonstrated that ozone can be used on polyester fabric and dye simultaneously. The aim of entering the fibre was achieved by etching the polyester and decolorisation was achieved by oxidising the chromaticity groups. Note de contenu : - EXPERIMENTAL : Materials and chemicals - Dyeing of the PET fabrics - Monitoring of the ozone feed rate - Optimum decolorisation technological conditions - Exploration of the decolorisation mechanism - Characterisation and measurement - RESULTS AND DISCUSSION : Optimum decolorisation technological conditions - Application of the optimum decolorisation technological conditions - Surface morphology of PET fabrics treated with ozone - Decolorisation of dispersed dye with ozone - Table 1 : Names, classes and structures of the dyes used in this study - Table 2 : Ozone feed rates used in this study - Table 3 : Dyeing conditions of treated samples - Table 4 : CIElab values of the ozone-treated and reference-dyed PET DOI : https://doi.org/10.1111/cote.12654 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12654 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39543 [article]

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