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Changes to surface flaws on deer hides during processing to garment leather / S. E. Gore in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 5 (09-10/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 5 (09-10/2002) . - p. 183-187 Titre : Changes to surface flaws on deer hides during processing to garment leather Type de document : texte imprimé Auteurs : S. E. Gore, Auteur ; R. M. Laing, Auteur ; S. Lange, Auteur ; D. R. Scobie, Auteur ; S. R. Young, Auteur Année de publication : 2002 Article en page(s) : p. 183-187 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Défauts Cuirs et peaux de cerfs Surfaces -- défauts Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The objective of this work was to describe surface flaws and defects visible at each of three stages of processing deer hides to garment leather (fellmongered, wet blue, and finished leather). Hides (n=60) from deer of known origin were examined visually at three stages of production. Visible surface faults were identified and recorded at each of the three stages. Some flaw (a bruise, scar, grain de-lamination, hole) was apparent on almost every hide (95.0% - 100.0% depending on the stage of processing), and with ‘new’ flaws becoming apparent with processing. The most common type of flaw visible in finished leather was the scratch, with many scratches evident at each processing stage. Reducing the incidence of scratches would improve the appearance of the leather. Note de contenu : - METHODS : Deer hides - Recording of flaws - RESULTS AND DISCUSSION : Number of flawed hides (and changes with processing), and flaw location - Types, size, shape of flaws, and changes with processing - Table 1 : Site on hides at which flaws were evident, and incidence of flaws of three processing stages - Table 2 : Incidence of flaw types at each of three processing stages - Table 3 : Size and shape of flaws at various stages of processing (number of observations) En ligne : https://drive.google.com/file/d/1BjQIzqVBtACkjSkPSxHtlJbCjQcEOReA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39857 [article]

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Chrome free tannages : Part 1 - Preliminary studies / Samir Dasgupta in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 5 (09-10/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 5 (09-10/2002) . - p. 186-194 Titre : Chrome free tannages : Part 1 - Preliminary studies Type de document : texte imprimé Auteurs : Samir Dasgupta, Auteur Année de publication : 2002 Article en page(s) : p. 186-194 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux d'agneaux Douceur (toucher) Mimosa et constituants Oxazolidine Résistance à la déchirure Sels d'aluminium Sulfate de tétrakis hydroxyméthyl phosphonium Le sulfate de tétrakis hydroxyméthyl phosphonium est un myxobactéricide qui offre une prévention efficace contre les biofilms microbiens dans les eaux de traitement, et ce, pour une vaste gamme de micro-organismes formant des biofilms. Le sulfate de tétrakis (hydroxyméthyl) phosphonium agit principalement en augmentant la perméabilité de la membrane externe de l'enveloppe de la cellule microbienne, ce qui entraîne la libération rapide de protéines et d'autres substances cellulaires par les cellules. En outre, le sulfate de tétrakis (hydroxyméthyl) phosphonium inhibe le processus de sulfatoréduction dans les bactéries réductrices de sulfate. Tannage chrome free Tannage combiné Le tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en œuvre par exemple Chrome-Végétal ou Chrome-Synthétique Tannage minéral Tannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium Tannage synthétique Tannage végétal Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The object of this study was to look afresh at the basic nature of a number of already established tanning agents, like aluminium chloride, aluminium sulphate, basic aluminium formate, basic aluminium acetate, and examine their tanningactivity alone or in combination with oxazolidines, tetrakishydroxy methyl phosphonium sulphate (THPS) andvegetable tanning agents. Note de contenu : - METHODOLOGY : 1) Studies on aluminium salts - 2) Tannages with aluminium salts - 3) Treatment of vegetable tanned lambskins with THPS and oxazolidine - 4) Vegetable tanned lambskins retanned with aluminium salt - RESULTS AND DISCUSSION : 1) Separation of various aluminium salts - 2) Tannages with aluminium salts - 3) Combination tannages with aluminium salts with other agents - 4) Combination with vegetable tanning agent (Mimosa Extract Powder ME) - Table 1 : Effect of aluminium retannage on the shrinkage temperature of vegetable tanned lambskin - Table 2 : Effect of aluminium retannage on the tear strength of vegetable tanned lambskin - Table 3 : Effect of oxazolidine offer on the shrinkage temperature of vegetable tanned lambskin (final pH 6.5; temperature – 45°C) - Table 4 : Effect of THPS offer on the shrinkage temperature of vegetable tanned lambskin (final pH 5.5; temperature – 45°C) - Table 5 : Effect of temperature on shrinkage temperature of vegetable/oxazolidine combination tanned skins - Table 6a : Effect of THPS/oxazolidine E retannages on the tear strength of vegetable tanned lambskin processed at 45C - Table 6b : Effect of THPS/oxazolidine E retannages on the tear strength of vegetable tanned lambskin - Table 7 : Effect of THPS/oxazolidine E retannage on the softness of vegetable tanned lambskin En ligne : https://drive.google.com/file/d/14NvgDGrpGo8I4x_2mpV1A04aUX3r50_V/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39858 [article]

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Collagen hydrolysate : Soluble skin applied in post-tanning processes : Part 2 - Interaction with acyrlic retanning agents / Carlos S. Cantera in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 5 (09-10/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 5 (09-10/2002) . - p. 195-202 Titre : Collagen hydrolysate : Soluble skin applied in post-tanning processes : Part 2 - Interaction with acyrlic retanning agents Type de document : texte imprimé Auteurs : Carlos S. Cantera, Auteur ; J. Martegani, Auteur ; G. Esterelles, Auteur ; Jorge A. Vergara, Auteur Année de publication : 2002 Article en page(s) : p. 195-202 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : acrylique, Acide L'acide acrylique ou acide acroléïque ou acide prop-2-énoïque est un composé organique de formule brute C3H4O2 et de formule semi-développée CH2=CHCOOH. C'est un acide carboxylique et un alcène vinylique, et se présente comme un liquide incolore à l'odeur âcre. L'acide acrylique et ses esters, les acrylates, sont utilisés dans la fabrication de matières plastiques, dans les peintures acryliques et dans divers autres polyacryliques qui ont de multiples usages. Agents de tannage Copolymères Cuir pleine fleur Cuirs et peaux de bovins Hydrolysat de collagène Post-tannage Tannage synthétique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In the upgrading of tannery solid wastes, the commercial application of the by-products obtained is the key to attractive technological alternatives. In the particular case of chrome shavings hydrolysed by an alkaline-enzyme process, the uses of collagen hydrolysate (CH) are the driving force for the start-up of a project when consideration is given to the amounts generated and to the diversity of applications, in addition to the fact that basic chrome salts -obtained from the dissolution of the chrome cake - may be used as trouble-free assistants to the fresh tanning agent. The present paper, which follows the Part I of this study ; "Collagen Hydrolysate : ‘soluble skin’ applied in post-tanning processes I. Characterisation” (JSLTC, 2000, 84,29) shows the experimental results obtained from the manufacture of various types of bovine leathers carried out at the CITEC pilot plant and in tanneries using CH in the post-tanning processes. In addition, the interactions of CH with acrylic retanning agents, studied at laboratory scale, are included. CH performs in a synergistic fashion with various retanning agents. In addition to its cosmetic-lubricating effect which enhances the leather grain properties and provides greater softness improving the resistance of the fibrous tissue, there is also a ‘restoring effect’ upon the grain surface of the semi-finished leather, masking preservation defects and damage marks on the skin. The interaction with dyes is evident from the intensified colours and improved homogeneity of the dyeing. CITEC has developed, besides CH, a copolymer CH-acrylic acid : "acrylic-protein" retanning agent MCH-106, that shows good properties in the development of full grain leather and splits. The application of the CH and the acrylic-protein MCH-106 in processing full-grain leather generates leathers of similar or higher quality to the standard one. The application of CH in leather manufacture is an attractive response to the question of how to use the by-products derived from the treatment of the chrome shavings. Note de contenu : - EXPERIMENTAL DEVELOPMENT : Experiments at CITEC - ANALYSIS OF THE RESULTS : CH application trials at the tannery - Table 1 : Reduction in formic acid consumption in the 'mixture solutions' With regard to the sum of the individual values (expressed in %) - Table 2 : Reduction in the salt KCr (SO4)2.12H2O consumption in the ‘mixture solutions’ with regard to the sum of the individual values (expressed in %) - Table 3 : Physical properties of the upper leather prepared with acrylic-protein retanning agent MCH106 and CH En ligne : https://drive.google.com/file/d/1ApP8ftPrxBi4iuQPgF3ZwC9qWN4r9ckE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39859 [article]

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Auxiliary agents with non-swelling capacity used in pickling-tanning processes. Part 2 / Ramón Palop in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 5 (09-10/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 5 (09-10/2002) . - p. 203-211 Titre : Auxiliary agents with non-swelling capacity used in pickling-tanning processes. Part 2 Type de document : texte imprimé Auteurs : Ramón Palop, Auteur ; Agusti Marsal, Auteur Année de publication : 2002 Article en page(s) : p. 203-211 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents anti-gonflement Cuirs et peaux Picklage Le picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu. Sulfoniques, Acides Tannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The use of different types of aromatic sulphonic acids, known as "non-swelling acids" has been suggested by many authors in order to avoid swelling when the pickling operation is completed with sulphuric and/or formic acid. G.Otto studied the influence of 16 aromatic sulphonic acids and their salts on the swelling of hides during the pickling process. He found that the acid swelling of the leather diminishes in sulphonic acids containing only one ring and an increased dipolar activity. Sulphonic acids with two rings and a high dipolar activity repress swelling in an even more remarkable way. In a previous paper, we studied the capacity of four commercial products to prevent acid swelling: polyacrylic acid ; naphthol 3-6-disulphonic acid; p-hydroxydiphenyl sulphonic acid and a blend of naphthalene and naphthol sulphonic acids (chemical A). On the basis of the results obtained, we concluded that an offer of 3% (on pelt weight) of the four products studied reduced swelling after pickling at salinity values of 0 ̊, 1 ̊ and 2 ̊ Bé. However, after tanning and dyeing, Chemical A provided the best results since, at a salinity of 2 ̊Bé, it prevented swelling sufficiently, gave rise to a good shrinkage temperature and did not reduce the colour too much when compared with the standard pickling process(L* = 50 against 42). In this part of the work, the application conditions for chemical A which were determined in the previous paper with hide pieces are here optimised for whole hides. First of all, a pickling process with chemical A is compared to a standard pickling process. Subsequently, the tanning process of hides treated with Chemical A and subsequently pickled is more deeply studied. Note de contenu : - EXPERIMENTAL PROCEDURE : Optimisation of application conditions of chemical A - RESULTS : Standard pickling process vs a pickling process with chemical A - Improvement of the tanning process - Variations in the process with chemical A and chemical C - Comparative study between the process with chemicals A and C and the standard (Reference) process - Table 1 : Process using a blend of naphthalene and naphthol sulphonic acids (chemical A) compared with a standard process - Table 2 : Process using chemical A and a strongly masked chromium salt (chemical C) - Table 3 : Process using chemicals A and C compared with a standard process - Table 4 : Evaluation of the residual bath and the wet-blue leather obtained with the standard process and the process with chemical A - Table 5 : Evaluation of the organoleptic and mechanical properties of leathers obtained with the standard process and the process with chemical A - Table 6 : Evaluation of the residual bath and the wet-blue leather obtained with the standard process and the process using chemicals A and C - Table 7 : Evaluation of the organoleptic and mechanical properties of leathers obtained with the standard process and the process with chemical A and C En ligne : https://drive.google.com/file/d/1efWw-7m3HRsXP5cXmGwNrwsK7EWQmS_C/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39860 [article]

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Studies on water dispersible products based on sulphitation of wool wax by trichlorosilyl sulphite agent / El-Shahat H. A. Nashy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 5 (09-10/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 5 (09-10/2002) . - p. 212-218 Titre : Studies on water dispersible products based on sulphitation of wool wax by trichlorosilyl sulphite agent Type de document : texte imprimé Auteurs : El-Shahat H. A. Nashy, Auteur ; N. H. El-Sayed, Auteur ; S. S. Elmorsy, Auteur Année de publication : 2002 Article en page(s) : p. 212-218 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Composition chimique Huiles et graisses synthétiques Lanoline Sulfitation Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Wool wax is an industrial by-product which has been investigated for further use in the leather industry. It was treated with trichlorosilyl sulphite (TCSS) as a new reagent to obtain an oil having sulphite groups. Trichlorosilyl sulphite (TCSS) can be generated in situ by the interaction of tetrachlorosilane with sodium sulphite or sodium bisulphite. This forms a basic raw material stock for the development of a range of synthetic fatliquors which can be used in the leather industry equivalent to those based on sulphochlorinated oils. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - Scanning Electron Microscopy - RESULTS AND DISCUSSION : A) - Wool wax acids - B) - USM Composition - 3) - FT-IR - Visual properties of fatliquored leather - Visual properties of fatliquored leather - Scanning Electron Microscopy (SEM) - Table 1 : The physical and chemical characteristics of El-Bieda wool wax. - Table 2 : Composition of wool wax fatty acids - Table 3 : Composition of wool wax USM - Table 4 : Sulphitation of wool wax under different conditions - Table 5 : Visual properties of fatliquored leather En ligne : https://drive.google.com/file/d/1UJnqRYet2KTiIFwP-tsp67_sdpHjdYa-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39861 [article]

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