Quality enhancement of low grade wet blue leathers : up-grading of thin substance in the wet end process / K. Gowthaman in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 9 (09/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 9 (09/2012) . - p. 292-301 Titre : Quality enhancement of low grade wet blue leathers : up-grading of thin substance in the wet end process Type de document : texte imprimé Auteurs : K. Gowthaman, Auteur ; S. Vikram, Auteur ; N. N. Fathima, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2012 Article en page(s) : p. 292-301 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Qualité -- Contrôle Tannage Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Various factors control the quality of the raw materials (hides/skins) used for leather processing. Leathers made from such varied quality of raw materials also have very varied grading. Leathers of higher grades are processed conventionally and finished to the desired effect and the required end product. However, processing and manufacturing of lower grade leathers and improving their properties to make them more useful for high quality products is a big challenge for the leather industry. Conventional up-grading of low quality leathers is brought about by surface modifications. However, such surface modifications significantly affect the natural look of the leathers and hence find use in products applications of low value. This study attempted to improve the grade of the leathers by suitably modifying the post tanning operations without affecting the natural feel of the leathers. One of the major defects, thin substance, has been selected for up-grading. The post tanning auxiliaries have been selected so as to enhance the substance of the leather. Different types of leathers (upper, glove and lining) were made from thin substance raw material. The physical strength properties of these leathers match that of the conventionally processed leathers. The organoleptic properties of the leathers made in this study are also on par with that of the conventional leathers. The cost of chemicals can be easily offset with the additional value realized by following this process of up-grading. Note de contenu : - EXPERIMENTAL : Post tanning operations - Physical testing of leather samples - Evaluation of organoleptic properties - Wet and dry rub fastness - Scanning electron microscopic analysis - RESULTS AND DISCUSSION : Syntans - Fatliquors - Up-grading in thin substance - Physical strenght characteristics, organoleptic properties and rub fastness measurements - TABLE I : Process recipe for upper leather from wet blue this substance - TABLE II : Process recipe for lining leather from wet blue thin substance - TABLE III : Process recipe for glove leather from wet blue thin substance - TABLE IV : Comparison of post tanning chemicals for conventional and experimental upper leathers from wet blue thin substance - TABLE V : Comparison of post tanning chemicals for conventional and experimental lining leathers from this substance - TABLE VI : Comparison of post tanning chemicals used for conventional and experimental glove leathers from wet blue thin substance - TABLE VII : Up-grading achieved for different types of leathers from wet blue thin substance - TABLE VIII : Physical strength characteristics of various leathers made from wet blue thin substance - TABLE IX : Rub fastness characteristics of various leathers made from wet blue thin substance En ligne : https://drive.google.com/file/d/15fJ2XqIbS4KAmKqlT25tLn-FTj0ZMQJR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16060 [article]

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Solving vein marks defects problem through wet end process / K. Gowthaman in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 9 (09/2014)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIX, N° 9 (09/2014) . - p. 278-283 Titre : Solving vein marks defects problem through wet end process Type de document : texte imprimé Auteurs : K. Gowthaman, Auteur ; S. Vikram, Auteur ; N. N. Fathima, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2014 Article en page(s) : p. 278-283 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Défauts Cuirs et peaux -- Finition Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Défaut de veine (cuir) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather grading is done on the basis of number of defects found on the leather. Defects either ante mortem or post mortem thus affect the final quality and price of the leather. In this study, we have investigated one of the ante mortem defects namely vein marks and have developed a process for upgrading leathers with this defect. SEM studies clearly depict the groove or indentation due to the vein marks. Upgradation using finishing often results in affecting the breathability of leathers. Hence, we have adopted a strategy of changing the post tanning recipe for upgradation of leathers with vein marks. The optimized post tanning recipe resulted in upper leathers with visibly reduced vein marks and the strength and organoleptic properties are on par with that of control leathers. Thus, this study shows that vein marks defect in leathers can be overcome by suitable post tanning process modifications. Note de contenu : - EXPERIMENTAL : Post tanning operations - Physical testing of leather samples - Evaluation of organoleptic properties - Wet and dry rub fastness - Scanning electron microscopic analysis - RESULTS AND DISCUSSION : Strategy followed for optimization of the post-tanning recipe - Upgradation in vein marks leathers - Physical strength characteristics, organoleptic properties and rub fastness measurements En ligne : https://drive.google.com/file/d/1iUAdqD0l62TdRRaqH20vDDq9OAGcz1RB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21865 [article]

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