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Innovative approach to sustainable leather tanning process using a lactic acid based agent / Malgorzata Kowalska in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 12 (12/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 12 (12/2019) . - p. 443-449 Titre : Innovative approach to sustainable leather tanning process using a lactic acid based agent Type de document : texte imprimé Auteurs : Malgorzata Kowalska, Auteur ; Anna Zbikowska, Auteur ; Magdalena Wozniak, Auteur Année de publication : 2019 Article en page(s) : p. 443-449 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Développement durable Lactique, Acide L'acide lactique est un acide organique qui joue un rôle dans divers processus biochimiques. Un lactate est un sel de cet acide. Contrairement à ce que peut laisser penser son nom, l'acide lactique n'est pas présent uniquement dans le lait, mais également dans le vin, certains fruits et légumes, et dans les muscles. L'acide lactique est un acide alpha hydroxylé, sa formule chimique est C3H6O3 et sa structure se reflète dans son nom systématique, l'acide 2-hydroxypropanoïque. Peaux brutes -- Trempe Tannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The objective of the present study was to evaluate selected properties of leather samples treated with innovative lactic acid-based agents, applied during the soaking process. The quality of leathers soaked in the baths containing agents based on the organic lactic acid was compared to the products obtained by traditional tanning, in which surfactants were used during the leather soaking process. The obtained results showed that the hides soaked using the eco-compound met the same quality requirements as those soaked in traditional surfactants. The study has proven that the surfactants, which are universally applied during the traditional leather tanning technology, can be replaced with an environmentally friendly agent which effectively reduces effluent pollution as well as its quantity. The proposed method has been successfully tested by one of the largest tanneries in Poland and is in the process of implementation, thus becoming an ecotechnology. Note de contenu : - Tanning and leather soaking process - Characteristics of new eco compounds used during soaking - Methods En ligne : https://drive.google.com/file/d/16GJFTkTEYVJ2RyNRIzSzlDGVrQ4KUZy9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33387 [article]

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Enzymatic reactions and phylogenetic analysis of haloveratile bacteria isolated from çamalti saltern salt samples used in the leather industry / Pinar Caglayan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 12 (12/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 12 (12/2019) . - p. 450-461 Titre : Enzymatic reactions and phylogenetic analysis of haloveratile bacteria isolated from çamalti saltern salt samples used in the leather industry Type de document : texte imprimé Auteurs : Pinar Caglayan, Auteur Année de publication : 2019 Article en page(s) : p. 450-461 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bactéries -- Isolement Cuirs et peaux -- Séchage Cuirs et peaux de moutons Enzymes microbiennes Sels de sodium Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Çamalti Saltern is one of the large seawater-based saltern located in Izmir, Turkey. The crude solar salt from Çamalti Saltern is used in leather industry. This type of salt may harbor viable microbial population which can spoil leather products during the curing process for hide/skins. Therefore, the objectives of this research were to isolate haloversatile bacteria from salt samples collected from Çamalti. Saltern, to identify these isolates using both conventional and molecular methods, and to determine their hydrolytic enzymes such as protease, lecithinase, cellulase, lipase, deoxyribonuclease, pullulanase, amylase, urease, caseinase, xylanase and esterase. In addition, damage caused by lipase and protease producing haloversatile bacteria to the structure of salted sheep skins was examined. The effects of different salt concentrations, pH and temperature values on the growth of haloversatile isolates were also investigated. Sixty-nine isolates of aerobic Bacteria showing different colony morphology, pigmentation, colony shape, and size were selected for characterization of the isolates. Phylogenetic analysis showed isolates belonging to the genera Staphylococcus (9 species), Exiguobacterium (3 species), Bacillus (11 species), Microbacterium (3 species), Gordonia (1 species), Kocuria (3 species), Paracoccus (2 species), Micrococcus (2 species), Acinetobacter (1 species), Brevibacterium (1 species), Pseudomonas (1 species), Agrococcus (1 species), Sanguibacter (1 species) and Virgibacillus (1 species). The haloversatile isolates were able to produce different enzymes such as catalase (100%), oxidase (80%), protease (52%), lecithinase (51%), cellulase (33%), lipase (23%), deoxyribonuclease (17%), pullulanase (10%), amylase (7%), urease (4%) and caseinase (4%). Scanning electron micrographs of sheep skins showed that catabolic activities of haloversatile bacterial species found in crude salt were responsible for decomposition of skins. When the crude salt containing haloversatile bacteria is used as a preservative for skins, these haloversatile bacteria may damage skin structure. Note de contenu : - Salt samples - Isolation of haloversatile bacteria from salt samples - Molecular identification of haloversatile isolates - Nucleotide accession number - Examination of cell morphology and pigmentation of haloversatile bacteria - Determining the effects of salt, pH and temperature on haloversatile bacterial growth - Examination of enzymatic activities of haloversatile bacteria - Sheepskin curing method and storage - Preparation of sheepskin samles for scanning electron microscope En ligne : https://drive.google.com/file/d/13mqUUdkonJ_bdMmp8izR5P9gUZXTJvtv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33388 [article]

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The suitability of leather as an alternative material for sustaining vessel production in Ghana / Baidu K. A. O. in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 12 (12/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 12 (12/2019) . - p. 462-469 Titre : The suitability of leather as an alternative material for sustaining vessel production in Ghana Type de document : texte imprimé Auteurs : Baidu K. A. O., Auteur ; Essuman E. K., Auteur ; Asubonteng K., Auteur ; Boahin J.O.B., Auteur Année de publication : 2019 Article en page(s) : p. 462-469 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir Cuir -- Séchage Cuir, Travail du Cuirs et peaux -- Industrie -- Ghana Récipients Tannage végétal Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Anecdotal evidence and a further report from leather experts show that there is close to no enlightenment of the production of leather vessels in Ghanaian leather industries. This study was, therefore, conducted as a result of the need to add leather as supplementary material to the traditional materials such as clay, metal, wood and half-gourd used for producing vessels in Ghana. The purpose of the study was to find out how Ghanaian indigenous leather could be used in the production of leather vessels. The qualitative study employed three key techniques, namely : 'Cuir bouilli' leather hardening methods, the sand pounding technique, and assemblage and construction technique. Based on the results, the baking and hot wax methods adversely affected the indigenous leather positively in the hardening of the leather. The results also show that using only one part of the leather (the back, belly or butt) affected the quality of the leather vessels, but incorporating the various parts of the hide helped improve the quality and durability of the leather vessels. The implications of the results and future research directions are also presented. This study has, therefore, expanded the usefulness of the Ghanaian indigenous vegetable tanned leather apart from the conventional usage for making shoes, bags and belts. Note de contenu : - MATERIALS AND METHODS : Source of materials - Preparation of material - Cutting leather specimen for hardening - Hardening of segmented leather parts - Construction of leather vessels using the various segmented parts (back, belly and butt) on the hide - Punching and sewing - Fill the bottle with sand (for shaping) - Sealing the bottle using 'cuir bouilli' techniques exterior 'cuir bouilli' - Interior 'cuir bouilli' - Final dressing of the leather bottle - Producing samples of the leather vessel using the part of the leather that best suit - RESULTS : Assessment of the various segmented parts of the hide's suitability for a leather bottle - Improving the quality of leather vessel making via use of butt, belly and back parts of the local leather - DISCUSSION : Hardening and stiffening technique - The suitability of different segmented leather part in moulding leather bottles - Improving the quality of the leather vessels by incorporating the back, belly or butt parts En ligne : https://drive.google.com/file/d/1IykonFDSTvr72uW1toZuKizMfUHAI7sK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33389 [article]

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Closed-loop processing : management in existing tanneries and new-builds designed for purpose / Richard Daniels in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 12 (12/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 12 (12/2019) . - p. 470-476 Titre : Closed-loop processing : management in existing tanneries and new-builds designed for purpose Type de document : texte imprimé Auteurs : Richard Daniels, Auteur ; Jiasheng Su, Auteur ; Falei Zhang ; Zhuangdou Zhang Année de publication : 2019 Article en page(s) : p. 470-476 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Industrie -- Aspect de l'environnement Cuirs et peaux de bovins Cuirs et peaux de moutons Déchets -- Réduction Déchets industriels -- Elimination Eau -- Consommation -- Réduction Eaux usées -- Recyclage Economies d'énergie Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Closed-loop processing for unhairing/liming and tannage is established technology for the processing of raw hides to the wet blue state. This approach produces a high value product and, as part of sustainable manufacture, is significant. Savings are gained in chemicals, water and energy and reductions in the wastewater load. In effluent treatment, both the sulfide oxidation stage and chrome recovery/regeneration systems are eliminated. Both sulfate and chloride are minimised, and a reduction in solid waste generation. In November 2018 new-build tanneries with radically different layouts were at an advanced stage of construction and installation of new equipment. These were designed to management and technical requirements of this specific technology. In addition, the technology had made the transition from bovine manufacture to nappa leathers production in a major sheepskin tannery. And within small scale opérations — bovine hides, bovine bellies, sheep and goat skins - chrome tannage was taking place with processing adapted around the prevailing conditions and tanners requirements. Note de contenu : - METHODOLOGY : Manufacturing procedures - Soaking and washes - The hair recovery and liming closed-loop - Limed hide movement - The deliming/bating processes - The pickle and chrome tanning closed-loop - Movement of water during process - Soalking and washes - The hair recovery and liming closed-loop - Removal of solubles and residules from process - The pickling and tanning closed-loop - An equilibrium of salts withinn processes - DISCUSSION : New-build bovine tanneries - Sheepskin manufacture - Small-scale manufacture En ligne : https://drive.google.com/file/d/1lEiqQLIsaEjlo8Cm83ljH7H91HEU8sXB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33390 [article]

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