Artificial neural networks for colour prediction in leather dyeing on the basis of a tristimulus system / Malathy Jawahar in COLORATION TECHNOLOGY, Vol. 131, N° 1 (02/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 1 (02/2015) . - p. 48-57 Titre : Artificial neural networks for colour prediction in leather dyeing on the basis of a tristimulus system Type de document : texte imprimé Auteurs : Malathy Jawahar, Auteur ; Chandra Babu Narasimhan Kannan, Auteur ; Mehta Kondamudi Manobhai, Auteur Année de publication : 2015 Article en page(s) : p. 48-57 Langues : Anglais (eng) Catégories : Couleur Couleur -- Analyse Echantillonnage Essais (technologie) Prévision, Théorie de la Qualité -- Contrôle Réseaux neuronaux (informatique) Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Computer-assisted colour prediction and quality control have become increasingly important to the dyeing process in many consumer goods manufacturing industries, including textile and leather. The most challenging aspect concerns dye recipe prediction for the production of the required shade on a given substrate. Computer recipe prediction based on the conventional and widely used Kubelka–Munk model often fails under a variety of conditions. In the present investigation, an attempt has been made to develop an artificial neural network model to predict colour in terms of tristimulus values (X, Y, Z) given the concentration of dyes. An artificial neural network model was trained with 300 pairs of known input vectors, i.e. dye concentrations, and output vectors, i.e. colour parameters, using a backpropagation algorithm. The artificial neural network topology consists of three neurons in the input layer to represent the concentration of dyes, three neurons in the output layer to represent the tristimulus values X, Y, and Z, and five neurons in the hidden layer with a log-sigmoid transfer function. The artificial neural network results showed a good level of colour prediction during the training and testing phase. The results also indicate that the artificial neural network has the potential to give better predictive performance than the conventional Kubelka–Munk model. Note de contenu : - INTRODUCTION : Conventional colour prediction model (the Kubelka-Munk model) - Neural network and colour prediction - EXPERIMENTAL : Materials - Leather sample preparation - Colour analysis - Database generation for the Kubelka-Munk model - Artificial neural network design - RESULTS AND DISCUSSION : Conventional colour prediction using the Kubelka-Munk model - ANN design optimisation - Artificial neural network training - Validation of the Kubelka-Munk and artificial neural network models DOI : 10.1111/cote.12123 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12123 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22983 [article]

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Biocolorant for leather dyeing applications : an eco-benign evaluation of natural coloring agent / C. Kurinjimalar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 9 (09/2021)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 9 (09/2021) . - p. 322-331 Titre : Biocolorant for leather dyeing applications : an eco-benign evaluation of natural coloring agent Type de document : texte imprimé Auteurs : C. Kurinjimalar, Auteur ; Gladstone Christopher Jayakumar, Auteur ; A. Tamil Selvi, Auteur ; Rajangam Venba, Auteur ; Malathy Jawahar, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2021 Article en page(s) : p. 322-331 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale Caractérisation Colorants végétaux Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Teinture Extraction (chimie) Garance et constituants Granulométrie Solidité de la couleur Stabilité thermique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Exploration of biocolorant in leather industry is explored widely owing to its environmental limitation. Besides, employing synthetic dyes in leather process requires high end of pipe treatment due to their complex chemical structure. Therefore, an attempt has been made on exploiting madder root dye (Rubia cordifolia L.) for leather dyeing application. The effect of varying pretreatment regimen on madder colorant extraction, chemical characterizations (including UV-Vis, IR, particle size, zeta potential value, and thermal studies) and optimum operating leather dyeing conditions are studied. The results revealed dissolving medium pH 5, 100oC, and 60 min duration of extraction is optimum. Thus, obtained dye characteristics showed maximum absorption peak at 460 nm, with an average particle size of 166 nm. It also shows a negative zeta potential value of -5.31 which is indicative for dyeing application. The optimum leather dyeing is found at leather pH 5.5, 10% dye concentration and 4 h duration. At optimum dyeing parameters it shows good fastness, perspiration, organoleptic properties without affecting the physical characteristic. Novelty of the present research would lead to develop eco-dyeing method in leather manufacture. Moreover, the study unravels a new application of eco-benign dye to achieve sustainable process. Note de contenu : - Graphical abstract - MATERIALS AND METHODS : Materials - Optimization on madder dye extraction - Preparation and characterization of madder dye - Spectral characteristics - Thermal property analysis - Leather dyeing application and analysis - RESULTS AND DISCUSSION : Optimization on madder dye extraction - Spectral characteristic analysis - Particle size and stability analysis - Thermal stability analysis - Leather dyeing optimization trials - Effect of concentration (Trial 1) - Effect of pH (Trial 2) - Effect of time (Trial 3) - Effect of mordants (Trial 4) - Grain surface analysis - Characterization of dyed leather - Color fastness analysis - Organoleptic properties analysis - Table 1 : Post-tanning procedure for dyeing using madder dye - Table 2 : Color value analysis of crust leather dyed using madder dye - Table 3 : Organoleptic and fastness properties of crust leather dyed using madder dye DOI : https://doi.org/10.34314/jalca.v116i9.4397 En ligne : https://drive.google.com/file/d/1rlk3HayVEXpRVU8p3Wop0diFyOqa6Xfd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36404 [article]

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Correlation of visual and instrumental color measurements to establish color tolerance using regression analysis / Malathy Jawahar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 12 (12/2015)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 12 (12/2015) . - p. 409-419 Titre : Correlation of visual and instrumental color measurements to establish color tolerance using regression analysis Type de document : texte imprimé Auteurs : Malathy Jawahar, Auteur ; Swarna Vinodh Kanth, Auteur ; R. Venba, Auteur ; Chandra Babu Narasimhan Kannan, Auteur Année de publication : 2015 Article en page(s) : p. 409-419 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorimétrie Couleur -- Analyse Cuirs et peaux -- Teinture Evaluation visuelle Statistique vision des couleurs Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Color is one of the important parameter considered in the determination of quality for fashion materials like leather. The color variation in each piece of leather sample in a batch should be within the acceptable range. Visual assessment is currently used in leather industry for quality control and color sorting. The current method used is subjective and often leads to disagreement between buyer and seller. Color measurement using reflectance spectrophotometer evaluates color consistently and is an objective assessment system. However, there is always an apprehension that the instrumental color assortment may not agree with the human perception of color difference. Hence, in the present investigation, an attempt was made to screen four color difference formulae, viz., CIELAB76, CMC (2:1), CIE94 and CIE2000 for their suitability in obtaining pass/fail decisions, which would be in conformity with that of the average human observer. Regression analysis was performed to find a correlation between visual and instrumental color assessments and the results indicate that CM (2:1) formula may be the most suited for the purpose. A detailed analysis of visual and instrumental color values revealed visual non uniformity towards sensitivity to hue, chroma and lightness. This difference in sensitivity was also taken into consideration in instrumental color sorting and pass/fail tolerance was established that led to closer conformity between visual and instrumental methods. Note de contenu : - MATERIALS AND METHODS : Materials - Methods : Visual assessment of color tolerance - Instrumental color analysis - Curve fitting and statistical analysis - RESULTS AND DISCUSSION : Statistical color analysis - Analysis on instrument and visual color perception - Color sorting with two dimensional grouping En ligne : https://drive.google.com/file/d/1XyT_llW7hzfrkDAGx7oDogTiBBBGc40h/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25051 [article]

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Dry colour prediction of leather from its wet state / Malathy Jawahar in COLORATION TECHNOLOGY, Vol. 129, N° 4 (08/2013)  

[article]  inCOLORATION TECHNOLOGY > Vol. 129, N° 4 (08/2013) . - p. 252–258 Titre : Dry colour prediction of leather from its wet state Type de document : texte imprimé Auteurs : Malathy Jawahar, Auteur ; Rajangam Venba, Auteur ; Govindhan Jyothi, Auteur ; Swarna Vinodh Kanth, Auteur ; Mallinath Jinandra Doss, Auteur ; Chandra Babu Narasimhan Kannan, Auteur Année de publication : 2013 Article en page(s) : p. 252–258 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Cuir -- Séchage Cuirs et peaux -- Teinture Spectroscopie de réflectance Tags : 'Cuir  sec'  mouillé'  'Modèle  régression'  'Teinture  cuir'  Séchage  'Spectroscopie  réflectance' Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The present investigation describes the development of a regression model for dry colour prediction based on the colour of wet leather. Such a prediction will be useful in the colour matching of leather – the time delay in drying of wet leather and determination of the final colour can be avoided. The use of computer technology interfaced with a reflectance spectrophotometer provides a novel approach to the prediction of dry colour from wet colour. In this study, five different regression models, i.e. linear fit, log fit, quadratic fit, log quadratic fit and cubic fit, were developed, with the dry reflectance of the leather sample as a dependent variable and the wet reflectance of the leather as an independent variable. The relationship between moisture content and surface leather colour, a prerequisite for enabling prediction, was studied. The obtained log quadratic model can be used for accurate prediction of dry colour from wet colour. DOI : 10.1111/cote.12033 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12033/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19036 [article]

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Instrumental assessment of levelness of dyed materials / Malathy Jawahar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 6 (06/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 6 (06/2004) . - p. 233-241 Titre : Instrumental assessment of levelness of dyed materials Type de document : texte imprimé Auteurs : Malathy Jawahar, Auteur ; G. Jyothi, Auteur ; R. Venba, Auteur ; M. Jinandra Doss, Auteur ; Chandra Babu Narasimhan Kannan, Auteur Année de publication : 2004 Article en page(s) : p. 233-241 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Levelness in dyeing is assessed traditionally in leather industry by subjective visual method or grading using a grey scale. In the present investigation, an attempt has been made to develop a reliable objective method for the assessment of levelness based on instrumental techniques. Three methods based on Mean Delta ECIE (color difference based on method of Commission International de I'Eclairage), Mean Delta ECMC (color difference based on method of Color Measurement Committee of the Society of Dyers and Colorists, U.K) and Relative Unlevelness Index (RUI) were screened for use on leather substrate and compared with the visual assessment method. The study was carried out for 13 shades on goat upper leathers. Results show that the method based on Mean Delta ECMC is the most suitable for all the shades and has a good correlation with the visual assessment rating. En ligne : https://drive.google.com/file/d/1H-JxLuux1DgvA8DJeZOqVgnd2G7GBhJd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4196 [article]

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Interaction of aldehyde developed from amino acids of tannery waste in a lower - chrome tannage an eco-friendly approach / James Kanagaraj in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 1 (01-02/2005)  

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Leather species identification based on surface morphological characteristics using image analysis technique / Malathy Jawahar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 8 (08/2016)  

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Machine vision inspection system for detection of leather surface defects / Malathy Jawahar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 1 (01/2019)  

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A novel approach for enhanced color intensity and uniformity in leather dyeing / Sujata Mandal in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 6 (06/2018)  

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Studies on solubilized sulfur dyes for coloring leather / R. Venba in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 6 (06/2015)  

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Studies on the influence of proteolytic enzymes in leather dyeing / Swarna Vinodh Kanth in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 12 (12/2006)  

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Study on compatibility of acid dyes : assessment using a computer colour matching system / Chandra Babu Narasimhan Kannan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 3 (05-06/1997)  

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