Acoustic emission studies for leather using dual sensors / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 4 (04/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 4 (04/2010) . - p. 109-115 Titre : Acoustic emission studies for leather using dual sensors Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Nicholas P. Latona, Auteur ; Joseph Lee, Auteur Année de publication : 2010 Article en page(s) : p. 109-115 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Capteurs (technologie) Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Emission acoustique Rigidité (mécanique) Rupture (mécanique) Traction (mécanique) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Since leather is sold by the square foot, destructive tests lessen the square footage of the material and infringe on the leather manufacturer's total profit. Therefore there is a need for developing an instrument to perform nondestructive testing of the physical properties of leather. In this investigation, experiments were designed to pass leather test samples through a pair of rotational acoustic sensors, thereby enabling the collection of acoustic emission (AE) signals from both the grain and corium and provide a more accurate assessment of the quality of leather. Observations showed a strong correlation between the mechanical properties of leather and the corresponding cumulative acoustic energy. We also used this dynamic method to characterize the grain break of leather. Results showed that the difference in grain break could be determined form the amount of acoustic hits collected from moving the AE sensors over a leather sample. Observations showed the poorer the grain break ; the more AE energy was detected. Data also demonstrated that thicker samples tended to have poorer grain break. In short, this study demonstrated that the tensile strength, stiffness, toughness ans grain break could be nondestructively determined by measuring acoustic quantities with a pair of rotational sensors. Note de contenu : - EXPERIMENTAL : Materials - AE methods and apparatus - Tensile property measurements - RESULTS AND DISCUSSION : Correlation between AE quantities and physical properties - Leather stiffness - AE evaluation of break En ligne : https://drive.google.com/file/d/1wnXpDZQhYpMFyJR0RdXJp95cXy-G6hX1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9075 [article]

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Adding value to sheep leather via coating with green synthesised zinc oxide nanoparticles approaches for advanced leather products / M. A. Habib in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 6 (11-12/2022)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 6 (11-12/2022) . - p. 264-270 Titre : Adding value to sheep leather via coating with green synthesised zinc oxide nanoparticles approaches for advanced leather products Type de document : texte imprimé Auteurs : M. A. Habib, Auteur ; Neha Mulchandani, Auteur Année de publication : 2022 Article en page(s) : p. 264-270 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Allongement à la rupture Caractérisation Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de moutons Nanoparticules Oxyde de zinc Traction (mécanique) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Natural leather is the oldest fibre which has been used by man since early times. In recent times, interest has increased in introducing smart properties to natural leather, giving it practical and economic importance. Recently, finishing, the purpose of which is to produce different leather types to meet consumer requirements has become focused on giving the leather properties that make it an advanced material with smart applications. The aim of this work is to produce superior quality leather that would upgrade its value in performance via nano metal oxide treatment. This aim has been followed by synthesising zinc oxide nanoparticles via green chemistry which is then loaded into sheep leather. The structural and morphological properties of the synthesised zinc oxide nanoparticles have been investigated by SEM and XRD. The SEM, EDX, infrared spectroscopy (FTIR) study, and tensile properties determination were undertaken, to see if any significant structural or chemical differences could be detected between ʻuntreatedʼ and ʻtreatedʼ leather. From the various analyses, it was ascertained that the nanoparticles were successfully deposited on the leather surface. The study thus provides an eco-friendly method for zinc oxide nanoparticle synthesis which can then be utilised for finishing sheep leather for creating functional properties. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - Incorporation of zinc oxide nanoparticles onto the leather surface - Leather characterisation - RESULTS : X-ray diffraction spectroscopy (XRD) analysis of zinc oxide nanoparticles - Scanning electron microscopy (SEM) analysis and EDX analysis - Fourier transform infrafred spectroscopy (FTIR) analysis - Tensile strength and elongation at break measurements - Table 1 : The functional groups in leather En ligne : https://drive.google.com/file/d/1MtOaZZGQq5HajPmRh9kzeIO8XijBc0qR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38519 [article]

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Adding value to tannery fleshings : Part I - Oils and protein hydrolysates - Production and application / I. Bragança in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 2 (03-04/2013)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 97, N° 2 (03-04/2013) . - p. 62-67 Titre : Adding value to tannery fleshings : Part I - Oils and protein hydrolysates - Production and application Type de document : texte imprimé Auteurs : I. Bragança, Auteur ; A. Crispim, Auteur ; A. Sampaio, Auteur ; E. Ramalho, Auteur ; F. Crispim, Auteur ; N. S. Caetano, Auteur ; P. C. Silva, Auteur Année de publication : 2013 Article en page(s) : p. 62-67 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Déchets -- Recyclage Cuirs et peaux -- Propriétés mécaniques Déchets -- Valorisation Echarnage Extraction (chimie) Glutaraldéhyde Huiles et graisses Hydrolysats de protéines Hydrolyse Produits de nourriture du cuir Protéines Sulfates Le sulfate est le sel de l'acide sulfurique H2SO4. La formule de l'ion sulfate est SO42-. Tannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The tanning industry generates a high quantity of solid wastes. Therefore, there is a need to create valorization [added value] options for these wastes. The present work had as its main objective creating added value by production of fat and hydrolyzed protein. To this end, fleshings were treated by hydrolysis with regard to the influence of various factors. The best result was found for a temperature of 60°C, 4 hours of hydrolysis, 2% of enzyme and 100% of water, with a fat extraction yield of 93%. The fat obtained through the hydrolysis process was used to produce sulphated oils. The protein hydrolysate was concentrated to about 40% of solids content and used to prepare co-products of protein hydrolysage and glutaraldehyde. Sulphated oils were applied in leather fatliquoring and the different protein hydrolysates were tested in leather retannage. The leather samples obtained were evaluated by physical-mechanical tests and the results were compared to those obtained through a standard process. the results were very satisfactory and, in some cases better than the specified standard. The process of adding value to this waste results in a double advantage for the leather industry, reducing the environmental impact and allowing production of alternative products for leather fatliquoring and retannage. Note de contenu : - MATERIALS AND METHODS : Fat extraction - Oil production - Hydrolysate treatment - Leather treatment and evaluation - Fat extraction - Oil production - Hydrolysate treatment - Leather treatment and evaluation En ligne : https://drive.google.com/file/d/1L81N_8EBYtQFg4_VzHytHtl0U2zipgd1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18143 [article]

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Aliphatic anionic polyurethane microemulsion leather filling-retanning agent / Bao Lihong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 2 (03-04/2007)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 91, N° 2 (03-04/2007) . - p. 73-80 Titre : Aliphatic anionic polyurethane microemulsion leather filling-retanning agent Type de document : texte imprimé Auteurs : Bao Lihong, Auteur ; Lan Yunjun, Auteur ; Shufen Zhang, Auteur Année de publication : 2007 Article en page(s) : p. 73-80 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Caractérisation Charges (matériaux) Chimie analytique Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Formulation (Génie chimique) Imperméabilisation Microémulsions Poids moléculaires Polymères aliphatiques Polyuréthanes Retannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The retanning process plays an important role in optimizing the leather’s colour, levelness, softness, fullness, and hydrophobicity. Polymer retanning agents are important materials for this process. The present study used maleic anhydride modified castor oil (MCO), PEG1000 (polyethylene glycol) and IPDI (isophorone diisocyanate) as main materials to synthesize polyurethane microemulsions (MC-PURs) and employed them to retan chrometanned leathers. The hydroxyl functionality of MCO was investigated by chemical and 1HNMR analysis, and confirmed to be about 2.0. The chemical structures of MCO, prepolymer and MC-PUR were characterized by IR. The optimized synthesis formulation and polyurethane microemulsion MC-PUR3 for MC-PURs as retanning agent was selected by comparing the properties of retanned leathers, such as softness, fullness, grain tightness, tensile strength, extension at break, depth of shade, waterproof properties et al. Then, MC-PUR3 was characterized by means of DSC, TG/DTG and TEM techniques. SEM microgram of MC-PUR3 retanned leather shows that the fibres are well dispersed. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of maleic anhydride modified castor oil (MCO) - Preparation of microemulsions of polyurethane filling retanning agents (MC-PURs) - Determination of molecular weight - H n.m.r. spectroscopy - Purification - FT-IR spectroscopy - Differential scanning spectroscopy - Thermo-gravimetric analysis - Transmission electron microscope analysis - Measurement of final dyebath exhaustion - Physical and waterproofness properties of leathers - Organoleptic properties of the final leathers - Scanning electron microscopic analysis - RESULTS AND DISCUSSION : Determination of the average molecular weight, hydroxyl number and average hydroxyl functionality (Fn(OH)) of MCO - Determination of the average hydroxyl functionality of MCO by chemical analysis - Determination of the average hydroxyl functionality of MCO by 1HNMR - Chemical structure analysis by IR - OPTIMIZATION OF RETANNING AGENT : Effect of MCO/PEG1000 mass ratio on the properties of retanned leathers - Effect of carboxyl content of MC-PUR on the properties of retanned leathers - Effect of NCO/OH molar ratio on the properties of retanned leathers - Thermal properties of MC-PUR3 - Table 1 : Basic formulations of MC-PURs - Table 2 : Filling, retanning and wet finishing processes - Table 3 : Effect of MCO/PEG1000 mass ratio on the properties of retanned leathers - Table 4 : Effect of carboxyl content of MC-PUR on the properties of retanned leathers - Table 5 : Effect of NCO/OH molar ratio on the properties of retanned leathers En ligne : https://drive.google.com/file/d/19ti2BicD3kfHFF4Z4QLX1cSWPC0J39gs/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39037 [article]

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An acrylic resin retanning agent with a reinforcing effect - Synthesised by hihg solids content microemulsion copolymerization / Wang Xuechuan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 4 (07-08/2005)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 4 (07-08/2005) . - p. 164-168 Titre : An acrylic resin retanning agent with a reinforcing effect - Synthesised by hihg solids content microemulsion copolymerization Type de document : texte imprimé Auteurs : Wang Xuechuan, Auteur ; An Huari, Auteur ; Sun Ming, Auteur ; Luo Yanhong, Auteur ; Feng Jianyan, Auteur Année de publication : 2005 Article en page(s) : p. 164-168 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Caractérisation Copolymères en émulsion 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 mécaniques Cuirs et peaux de porcs Granulométrie laser Haut extrait sec Latex Microémulsions Polyacryliques Polymérisation en émulsion Retannage Tannage organique Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : An acrylic resin nano-size latex whose colloidal particle size was about 20nm and solids content about 25% was prepared by a high solids content semicontinuous microemulsion copolymerization. The experimental product was employed in retanning drop [bottom] splits of pigs aiming to reinforce the leather. The offer of cross-linking agent and functional monomer were varied in the copolymerization experiment and their effect on the reinforcing function was investigated. The effect of colloidal particle size and dosage of nano-size latex on the reinforcing function also was verified. The particle size of the latex was tested with a laser particle size analyzer, and the composition of the copolymer was analyzed by infrared spectrometry. Multifunction material test equipment was used in the physical testing of the retanned leather. The result of the experiment showed: when the dosage of divinylbenzene (DVB) was 1.2% and the dosage of acrylic acid (AA) 0.8%, the reinforcing performance was the highest. When the colloidal particle size decreased from 64.2nm to 16.3nm, the reinforcing effect was also enhanced. The tensile strength increased by 68%, and the tear strength improved 44% after the drop splits of pigs were retanned with 2% acrylic resin nano-size latex (with respect to the shaved wet blue weight). The effect of the dosage of sodium lauryl sulphate (SLS), n-pentanol (PA), ammonium persulfate (ASP) and AA on the colloidal particle size was also studied. Note de contenu : - EXPERIMENTAL DETAILS : Materials - Synthesis - APPLICATION OF NANO-SIZE LATEX IN RETANNING CHROME TANNED PIG DROP SPLITS : Characterization - RESULTS AND DISCUSSION : Colloidal particle size of the microemulsion copolymer - The IR spectra of BA/MMA/DVB copolymers prepared by microemulsion copolymerization - The effect of functional monomer on the reinforcing function - The effect of cross-linking agent on the reinforcing function - The effect of colloidal particle size on the reinforcing function - The relationship between dosage of retanning agent and reinforcing effect - Table 1 : Recipes used in the series of experiments and average particle size of synthesized latexes - Table 2 : Process details for the retanning applications of nano-size latex on wet blue pig drop splits En ligne : https://drive.google.com/file/d/1GoIENUWkqhu85g-LTxdP-0cZzXD-IvPo/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39249 [article]

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An effective and harmless recycling technology for hazardous chrome-tanned leather wastes / Minghui Li in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 108, N° 2 (03-04/2024)  

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An experimental comparative study of the effect of skin type on the stability of vegetable leather under acidic condition / Alireza Koochakzaei in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 11 (11/2018)  

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An experimental comparative study on silicone oil and polyethylene glycol as dry leather treatments / Alireza Koochakzaei in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 10 (10/2016)  

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An innovative new application of hydrogen peroxide to accelerate chamois leather tanning. Part II : Effect of oxidation times on the quality of chamois leather / Ono Suparno in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 5 (05/2013)  

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An optimization study of the graft polymerization of HEMA onto leather / R. A. Masoud in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 4 (07-08/2003)  

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Anomalies of pigskin structure / R. Monastyrska-Przybylak in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 66 (Année 1982)  

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Antimicrobial activity of chrome-tanned leathers treated with chitosan formate / B. Ocak in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 5 (09-10/2015)  

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Application of acrylic resin coating agent modified by nano SiO2 / Ma Jianzhong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 5 (09-10/2006)  

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Application of carboxyl-functionalized epoxy resin in the leather tanning process / Bin Lyu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 7 (07/2018)  

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Application of nonionic gemini aliphatic polyurethane surfactant for improving the performance of vegetable tanned leather / Shuangquan Lai in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 11 (11/2019)  

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Application of titanium metal oxide nanoparticles for leather coating / Sivaraj Sudhahar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 3 (03/2013)  

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Application of Y-shaped polyurethane and polyacrylic acid as a complex retanning agent in aldehyde-tanned goat leather / Shuangquan Lai in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 11 (11/2017)  

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Atmospheric pollutants and the deterioration of leather / H. V. Piltingsrud in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 2 (03-04/2022)  

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Auxiliary agents with non-swelling capacity used in pickling-tanning processes - Part 4 / Agusti Marsal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 6 (11-12/2004)  

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Base line : amphoteric implications / Olga Ballùs in LEATHER INTERNATIONAL, Vol. 217, N° 4861 (06/2016)  

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