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Auxiliary agents with non-swelling capacity used in pickling-tanning processes. Part 1 / Ramón Palop in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 4 (07-08/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 4 (07-08/2002) . - p. 139-142 Titre : Auxiliary agents with non-swelling capacity used in pickling-tanning processes. Part 1 Type de document : texte imprimé Auteurs : Ramón Palop, Auteur ; Agusti Marsal, Auteur Année de publication : 2002 Article en page(s) : p. 139-142 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents anti-gonflement Couleur Cuir teint Cuirs et peaux Epaisseur -- Mesure Humidité -- Absorption:Eau -- Absorption 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. Post-tannage Tannage Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The aim of this study is the development of a salt-free pickling-tanning process and, as a consequence, the reduction of the total conductivity of waste waters. In the first part of the work, a comparative study was carried out to determine the capacity of four commercial products to prevent swelling : - polyacrylic acid - naphthol 3-6-disulphonic acid - p-hydroxydiphenyl sulphonic acid - a blend of naphthalene and naphthol sulphonic acids (Chemical A) Note de contenu : - Aims of the Work - Experimental procedure - Results : Percentage of absorbed water after pickling - Thickness after pickling - Thickness and shrinkage temperature after tannage - Intensity of colour of dyed samples - Table 1 : Treatments with the specified products - Table 2 : Water absorption(%) after pickling as a function of the auxiliary agent and salinity - Table 3 : Thickness (mm) after pickling as a function of the auxiliary agent and salinity - Table 4 : Thickness (mm) after tanning as a function of the auxiliary agent and salinity - Table 5 : Shrinkage temperature (oc) as a function of the auxiliary agent and salinity - Table 6 : Post-tanning processes - Table 7 : Intensity of colour (l*) of dyed samples (grain side) as a function of the auxiliary agent and pickle salinity En ligne : https://drive.google.com/file/d/1wHSOfUeCdi27SGXxuRRe6MLiNVEFl0tz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39902 [article]

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Investigation of the influence of tanning fatliquoring preparations on collagen by infrared spectroscopy / Anita Przepiórkowska in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 4 (07-08/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 4 (07-08/2002) . - p. 143-147 Titre : Investigation of the influence of tanning fatliquoring preparations on collagen by infrared spectroscopy Type de document : texte imprimé Auteurs : Anita Przepiórkowska, Auteur Année de publication : 2002 Article en page(s) : p. 143-147 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants Composés chimiques bi-fonctionnels Cuirs et peaux -- Teinture Cuirs et peaux de veaux Huiles et graisses Produits de nourriture du cuir Tannage Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A topic of our investigative works for several years has been simultaneous compact tanning and fatliquoring using compounds possessing the dual functions of tanning and fatliquoring of skins and hides in one single operation. Material for uppers such as calf, bovine, pig and rabbit skins tanned and fatliquored by means of the aforementioned operations possesses good hydrothermal (Ts) properties and have a soft and full handle. The surface of compact tanned skins has a positive electrical charge but its magnitude is lower than in case of classically chrome tanned material. A higher degree of masking of the chrome (III) complexes by organic ligands in the compact tanned skins permits us to obtain better and deeper penetration of dyestuffs in garment leathers. It has been shown that the introduction of the combined bifunctional tanning agent (i.e. tanning agents chemically bound with fatliquoring compounds) into the skin tissue produces leather containing 5.4% to 6.1% non-extractable fat. The introduction of such bifunctional compounds into the skin during tanning gives the leather desirable properties such as resistance to aqueous and organic solvent based cleaning agents such as are commonly used to clean leather garments. Based on the results of the investigations into compact and simultaneous tanning and fatliquoring processes we appear to be dealing with quite a different process mechanism from that applicable to clasical tanning and fatliquoring. The aim of this study is to investigate by infrared spectroscopy the mutual influence of model preparations and tanning- fatliquoring compounds on the one hand on gelatine (which could be considered as a model of skin tissue) and calf skin on the other. En ligne : https://drive.google.com/file/d/11mIMMOVCX_T6cfGwTltc_r4Q1MesGDWt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39903 [article]

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Alternative treatments for footwear industry liquid effluents - Part 3 - Pressure wet hydrogen peroxide / M. J. Ferreira in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 4 (07-08/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 4 (07-08/2002) . - p.148-152 Titre : Alternative treatments for footwear industry liquid effluents - Part 3 - Pressure wet hydrogen peroxide Type de document : texte imprimé Auteurs : M. J. Ferreira, Auteur ; M. F. Almeida, Auteur ; S. Pinho, Auteur ; A. Neves, Auteur Année de publication : 2002 Article en page(s) : p.148-152 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Industrie -- Aspect de l'environnement Eaux usées -- Epuration Peroxyde d'hydrogène Le peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales. Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Footwear industry finishing operations generate non-biodegradable liquid effluents having a high organic load, mainly due to dyes, organic acids and organic solvents. Coagulation/flocculation followed by carbon adsorption is one option for treating these effluents, since it may allow the discharge of the final effluent to sewage systems but not to water courses. The process is of dubious utility due to the sludge produced and the required adsorbent amount. Such limitations pushed the research towards wet oxidation (WO) already tested with oxygen as oxidant. The reduction of effluent chemical oxygen demand (COD) with this treatment at 200 °C ranges from 50 - 80%, depending on the conditions and the initial COD of the wastewaters. However, residual COD values are too high for discharging the effluent to public sewage systems. Therefore, WO using hydrogen peroxide is the alternative method tested here. The experiments carried out evaluated the influence of temperature, time, H2O2 dose and pH on the reduction of effluent chemical oxygen demand (COD) and other characteristics of the wastewaters. The catalytic effect of iron on the WO treatment efficiency was also evaluated. Note de contenu : - Influence of H2O2 dose and pH - Influence of time of the reaction - Influence of temperature - Influence of iron as catalyst - Influence of filtration - Table 1 : Influence of H2O2 dose in the COD, BOD5 and TOC at different pH - Table 2 : Influence of time on the COD, BOD5 and TOC at 200 ̊C and pH2 - Table 3 : Influence of temperature on the COD, BOD5 and TOC at pH2 for 30 minutes - Table 4 : Influence of iron on the COD, BOD5 and TOC at 150 ̊C, pH3 and 30 minutes - Table 5 : Wet oxidation using H2O2 on non-filtered effluents of finishing footwear operations En ligne : https://drive.google.com/file/d/1vg8J_9NzQGt6eXQSzQz89J4nHZ5E8NFK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39904 [article]

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Characterisation of peroxide value in natural oils and fats by Fourier Transform Spectroscopy / Zhou Hualong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 4 (07-08/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 4 (07-08/2002) . - p. 153-156 Titre : Characterisation of peroxide value in natural oils and fats by Fourier Transform Spectroscopy Type de document : texte imprimé Auteurs : Zhou Hualong, Auteur ; Minghua Liu, Auteur ; Junshu Zhang, Auteur ; Zhang Xinshen, Auteur Année de publication : 2002 Article en page(s) : p. 153-156 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Fourier, Spectroscopie infrarouge à transformée de Huile de colza Huiles et graisses -- Analyse Huiles et graisses -- Oxydation Huiles et graisses de poissons Indice de peroxyde Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A primary Fourier transform infrared (FTIR) spectroscopic method was applied here to characterise the peroxide value (PV) in natural oils and fats such as refined rapeseed oil, fish and also rape oil with partial ester exchange so that the changes after the catalysed oxidation of the above three kinds of oils and fats could be studied. It can be concluded that the changes in the oxidised oils and fats can be characterised by FTIR spectroscopy directly and quantitatively. R - OOH which can react with sulphites is the main oxidation product. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Instruments and apparatus - Preparation of samples - RESULTS AND DISCUSSION : Synthesis mechanism - Spectrum analysis and discussion - Table 1 : PV of pure rapeseed oil - Table 2 : PV of rapeseed oil with partial ester exchange En ligne : https://drive.google.com/file/d/1bVlxzKL1zRnlKy5AZzxZc3viFQiAV5-O/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39905 [article]

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Deer leather as a material for outerwear / S. Lange in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 4 (07-08/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 4 (07-08/2002) Titre : Deer leather as a material for outerwear Type de document : texte imprimé Auteurs : S. Lange, Auteur ; R. M. Laing, Auteur ; B. E. Niven, Auteur ; D. R. Scobie, Auteur ; S. R. Young, Auteur ; S. E. Gore, Auteur Année de publication : 2002 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés physiques Cuirs et peaux de cerfs Statistique Vêtements en cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The objective of this work was to identify the critical physical properties of garment leather, the optimal sampling position on the hide, and the recommended number of hides required from one source to adequately describe selected physical properties relevant to garment manufacture. Hides from deer of known origin were processed to finished garment leather and selected properties of the finished leather relevant to garment manufacture were measured. Variability in these properties across any one hide, and among hides from different animals was determined and was less than that reported for ovine leather and similar to that reported for woven textiles used in outerwear. The extension of deer leather exceeded that recommended for woven garment materials, and was greater than that observed on ovine leather. The location on a hide, and the number of hides to be sampled from each batch in order to obtain representative results were determined (near the backbone at approximately the fore leg position ; and three, respectively). Note de contenu : - METHODS : Deer hides - Measurement and statistical analysis of properties - Representative location and optimum number of hides - RESULTS : Sampling site, and number of hides required - Table 1 : Differences from different groups (age and month of kill) and position on the hide - Table 2 : Estimated number of hides required for sampling, and the 'ideal location' for sampling En ligne : https://drive.google.com/file/d/1eAt0o2ScccHR5G6q0lSWzpKon1S4lq1J/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39906 [article]

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A survey of current bookbinding leathers : Part 1 : Chemical an physical properties / M. S. Thomson in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 4 (07-08/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 4 (07-08/2002) . - p. 163-170 Titre : A survey of current bookbinding leathers : Part 1 : Chemical an physical properties Type de document : texte imprimé Auteurs : M. S. Thomson, Auteur ; Geoffrey E. Attenburrow, Auteur ; I. Ionnadis, Auteur ; S. Jeyapalina, Auteur ; T. Lochmuller, Auteur Année de publication : 2002 Article en page(s) : p. 163-170 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés chimiques Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés physiques Essais de résilience Essais dynamiques Lastomètre Reliure Résistance à la déchirure Résistance à la traction Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Many books spend most of their lives, unused, on library shelves. However, when their owner or the library subscriber wishes to read them they expect the bindings to be in perfectly sound condition. Unlike the majority of products made from leather, bookbindings are expected to last almost indefinitely. That is why when, in the middle of the nineteenth century, it was discovered that large numbers of new bindings were deteriorating rapidly, an explanation was sought. That is also why, over the next century and a half, investigations were made into methods for producing bookbinding leathers with increased resistance to the various agents of deterioration. Care had to be taken, however, to ensure that the materials produced retained the physical characteristics which had made leather the premier choice of bookbinders for hundreds of years. These include ease of paring, easeof moulding, lack of springiness and ability to be tooled. Note de contenu : - CHEMICAL PROPERTIES : Moisture content - Total ash - Loss by washing - Organic loss by washing - Water insoluble salts - Total nitrogen/skin substance - Aluminium content - Aluminium content - CONCLUSIONS - PHYSICAL PROPERTIES : tensile strength - Tear strength - Lastometer test - Resistance To flexing whilst under strain - Softness - Table 1 : Représentative european bookbinding leathers - Table 2 : Chemical test results - Table 3 : Physcal test results En ligne : https://drive.google.com/file/d/1i9PQwHVQSeUY9AaifF5Q-sgM70k8nv87/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39907 [article]

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