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Microbial degradation of horn mean with bacillus subtilis and its application in leather processing : a two fold approach / S. Balaji in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 3 (03/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 3 (03/2008) . - p. 89-93 Titre : Microbial degradation of horn mean with bacillus subtilis and its application in leather processing : a two fold approach Type de document : texte imprimé Auteurs : S. Balaji, Auteur ; M. Senthil Kumar, Auteur ; Chandra Babu Narasimhan Kannan, Auteur ; Praveen Kumar Sehgal, Auteur Année de publication : 2008 Article en page(s) : p. 89-93 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Horn meal hydrolysate, obtained by high steam pressure treatment of raw horns and hoofs of cattle and buffalo, yields a mixture of water soluble peptides by microbial degradation using native strain of bacillus subtilis. It is designated as bacterial degraded horn meal hydrolysate (BDHH). BDHH sotres well and does not putrefy when left at ambient conditions of temperature (31 +-3°) and relative humidity (40-80% RH). This material is employed with great success in leather tanning process to improve the exhaustion of chrome and to fill the void within the tanned collagen fibers during retanning operation. Use of BDHH in leather processing could cut down consumption of chromium salts in chrome tanning by considerably reducing the discharge of chromium in the waste liquor from 30-35% to less than 10%, thus saving cost on chromium salts and reducing the pollution load in commercial tanning operations. Filling of tanned leather with BDHH in retanning operation upgrades the crust leather. En ligne : https://drive.google.com/file/d/1s2r3Bkx00sWM3DJGeVdF7jTg91IyGX7W/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2576 [article]

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New acoustic methods for nondestructive evaluation of leather quality / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 3 (03/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 3 (03/2008) . - p. 94 - 102 Titre : New acoustic methods for nondestructive evaluation of leather quality Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Nicholas P. Latona, Auteur Année de publication : 2008 Article en page(s) : p. 94 - 102 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Currently, there is no on-line test method to monitor the physical properties of semi-products such as wet blue or crust during the leather-making processes. Inferior leather semi-products, such as wet blue, cannot be downgraded earlier or removed before going through many expensive processes (including retanning, fatliquoring, dyeing, drying, staking, milling and finishing). Therefore, developing a nondestructive tester to perform on-line testing of the physical properties of semi-products is very desirable. Recently ARS transferred its knowledge gained over the years to Physical Acoustics Corporation (PAC) and collaborated with the leather industry in order to produce an on-line nondestructive acoustic emission tester. This paper discusses the activities performed by PAC, ARS, and Seton Company during the Small Business Innovative Research (SBIR) Phase I project ¿Acoustic Emission for the Characterization of Leather.¿ The main objective of this project was to demonstrate the feasibility of using AE and Airborne UT to assess, characterize, and classify the quality level of various types of leather. The results obtained in this project show that it is feasible to use AE for the evaluation of leather quality during the manufacturing process. A newly designed AE system for the evaluation of leather quality is discussed in this paper. This system, which combines a handheld AE instrument with a rolling sensor probe, offers the potential for testing entire hides in the manufacturing plant. Data could be gathered from different sections of the hide, along different directions with respect to the backbone, and during different stages in the manufacturing process. Finally, we reported a simple method using a mechanical stopwatch as an acoustic wave source. Hits rate were collected when sound traveled though the leather samples. Results show a strong correlation between tensile strength and cumulative hits. En ligne : https://drive.google.com/file/d/1Q1RgHbXfeSuf10r5bwbPD3ljYa5Vm2d_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2577 [article]

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Transformation plant for converting chromium waste into chemical products for the leather industry / Jaime Cot in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 3 (03/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 3 (03/2008) . - p. 103 - 113 Titre : Transformation plant for converting chromium waste into chemical products for the leather industry Type de document : texte imprimé Auteurs : Jaime Cot, Auteur ; J. Cot-Gores, Auteur ; F. Fernandez-Hervas, Auteur ; Pedro J. Celma, Auteur ; Albert M. Manich, Auteur ; Agusti Marsal, Auteur Année de publication : 2008 Article en page(s) : p. 103 - 113 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The experience gained by our research team in recent years has led to the optimization of a quick and effective procedure for the complete dechromation of chromium waste. This procedure is based on the oxidation of chromium (III) to chromium (VI) through the action of hydrogen peroxide in an alkaline medium. The highly toxic chromium (VI) is stored in a stainless steel tank before being subsequently reduced to chromium (III), which can be reused in the tanning process. The oxidation reaction, at room temperature, leads to the formation of peroxochromates that have great oxidizing power and which significantly accelerate the pre-hydrolysis; corresponding to the maceration stage in the gelatine production process. In this way, gelatine or any other type of collagen biopolymer can be obtained in a single stage and with an excellent yield. We have designed an industrial transformation plant for chromium waste in chemical products used by the tanning industry. This plant consists of the following equipment: defibering machine, hydroextractive centrifuge, two reactors (dechromation and for obtaining biopolymers), tank for storage and reduction of chromium (VI), atomizer (optional), simple equipment for heating concentrated biopolymer solutions, transportation truck. Given that the overall investment has a payback back in five years, the cost of the plant can easily be borne by the tanner. This project has two objectives: firstly, to help solving an important environmental problem faced by the leather industry, which incurs significant costs in managing this type of waste; and secondly, to enable acceptable financial gains in terms of obtaining chemical products designed for the tanning industry. These products are: basic chromium (III) salts from the chromium waste, collagen biopolymers suitable for retanning, filling, basifying, deliming and glazing finishes that can partially and/or totally replace casein. Our proposed transformation plant for chromium waste was designed in such a way as to be adaptable to the individual circumstances of all interested leather industries, thus avoiding the need to build a communal plant, where the costs of transporting waste would have a negative effect on final savings. The plant is designed to process all types of chromium waste produced during the tanning process and in the subsequent stages of manufacture (fatliquoring, retanning, dyeing and finishing), and includes chromium waste with wool/hair (double-face). A financial study of the overall installation and the corresponding cost in obtaining the new chemical products was also been carried out and reveals significant savings for the tanner. En ligne : https://drive.google.com/file/d/1YMEn_JJMYoQ1bS88gsP7UcK8UX5vP8rl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2578 [article]

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New antimicrobial complex of copper (II) with benzothiazole derivative : synthesis and application in leather industry / Haibin Gu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 3 (03/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 3 (03/2008) . - p. 114 - 118 Titre : New antimicrobial complex of copper (II) with benzothiazole derivative : synthesis and application in leather industry Type de document : texte imprimé Auteurs : Haibin Gu, Auteur ; Xia Hao ; Changqing Zhao ; Wuyong Chen, Auteur Année de publication : 2008 Article en page(s) : p. 114 - 118 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather goods, especially leather shoes, are often damaged by microorganism and their antimicrobial performances are increasing demanded. However, the normal leather fungicides can not meet the requirement to the antimicrobial agents used in the leather goods; it is significant to develop an effective, harmless and broad-spectrum antimicrobial compound for leather goods. In this study, a novel ligand, 4-[(2-benzothiazolylimino) methyl] phenoxyacetic acid (HL), was prepared by 2-amino benzothiazole and 4-formyl phenoxyacetic acid in absolute ethyl alcohol and the copper complex was synthesized by HL and copper acetate in ethanol at 65℃. The chemical structures of the ligand and copper complex were characterized by elementary analysis, UV, IR, and 1H NMR. Results show that the copper ion coordinate with two oxygen atoms of phenoxyl and carboxyl in the ligand and two stable pentagonal rings are formed. The antimicrobial activity of the complex against representative species of bacteria and fungi isolated from leather shoes was assessed by the determination of minimal inhibitory concentrations (MICs). Results show that MICs of the copper complex were 100-200 mg L-1 to bacteria, 1-50 mg L-1 to moulds and 1 mg L-1 to yeasts, respectively. The copper complex with the concentration of 0.5-7.5 g L-1 in acetone was applied to shoe lining, and the inhibitory effects of the treated shoe lining were evaluated by inhibition zone method, plate culture medium method and inhibition ratio method. Results indicate that the shoe lining fabric containing more than 27.03 g kg-1 of the antimicrobial compound can form clear inhibition zones with diameters of 25-55 mm, inhibit the growth of microorganism after inoculated on plate culture mediums and achieve more than 90% inhibition ratio. So, the new complex is a potential compound as a leather antimicrobial agent. En ligne : https://drive.google.com/file/d/1K-T0iSwLq8C4bsR1vTFuFDv9oWWt8PCS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2579 [article]

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