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Mention de date : 06/1999
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Processing of collagenic residues. Isolation of gelatin by the action of peroxochromates / Jaime Cot in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIV, N° 4 (06/1999)
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Titre : Processing of collagenic residues. Isolation of gelatin by the action of peroxochromates Type de document : texte imprimé Auteurs : Jaime Cot, Auteur ; Albert M. Manich, Auteur ; Agusti Marsal, Auteur ; Maria Fort, Auteur ; Pedro J. Celma, Auteur ; Robert Carrio, Auteur ; Rigoberto Choque, Auteur ; Luisa F. Cabeza, Auteur Année de publication : 1999 Article en page(s) : p. 115-128 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The experience of our research group with topics related to the dechroming(III) to chromium(VI) by peroxides in alkaline conditions, allowed us to know in-depth the reaction mechanisms. The formation in situ of some peroxochromates (containing up to 2,5 groups peroxo for each atom of chromium), unstable and with a great owidizing potential, is fundamental in the process of gelatin isolation. It has been demonstrated that the chromium-containing collagenic wastes that had bee previously dechromed by this method produce a gelatin with better yield, quality and in a much shorter treatment, compared with conventional methods described in the literaure. The residual chrome content in the gelatin can be eliminated using tangencial ultrafiltration and the reverse osmosis techniques. Furthermore, the chromium (VI) is recovered by ion-exchange resins and can be re-used in tanneries. Finally, physico-chemical characteristics of the isolated gelatins were evaluated. Note de contenu : - EXPERIMENTAL : First experimental design - Second experimental design - Activity of the peroxochromates generated in situ
- RESULTS AND DISCUSSION : Applications of the isolated gelatin - Future perpectivesEn ligne : https://drive.google.com/file/d/1mf5XWt0cvDqFdzZhQVdLcmbnTosrgp3h/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4455
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIV, N° 4 (06/1999) . - p. 115-128[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006974 - Périodique Bibliothèque principale Documentaires Disponible Tearing behavior of chrome-tanned leather / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIV, N° 4 (06/1999)
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Titre : Tearing behavior of chrome-tanned leather Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Michael D. Mcclintick, Auteur Année de publication : 1999 Article en page(s) : p. 129-145 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Tearing tests were performed along with tensile tests on chrome-tanned leather to clarify the difference between the teraing and tensile behaviors and their fracture mechanisms. For the tearing tests, a unique zigzag fracture pattern was observed due to the fluctuations in the tearing force, whereas the tensile tests demonstrated a uniform fracture pattern. Observations also showed that strain rate does not significantly affect tearing strength, but slightly affects tensile strength. Both strengths increase with increasing moisture content until certain levels, beyond which they start to decrease with increasing moisture content. A drastic difference between these two strengths is demonstrated in their response to sampling angle change. Tearing strength showed little variation with the change of sampling angle, whereas the tensile strength was maximum when sampled parallel to the backbone, then steadily decreased when sampling angle deviated from the backbone line. Statistical analysis showed that the tensile strength did not correlate well to tearing strength, whereas a good correlation was observed between fracture energy and tearing strength. Note de contenu : - EXPERIMENTAL : Materials - Statistical modeling - Tearing and tensile tests - Measurement of the fracture energy
- RESULTS AND DISCUSSION : Force-elongation curves - Regression model and analysis of variance - Strain rate - Moisture content - Sampling angle - Correlation between tearing strenght and fracture energy - Effects of staking and fatliquoringEn ligne : https://drive.google.com/file/d/1zE_EOB9A_Jf0oCkOA_F6jHH_GHiq4iWX/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4456
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIV, N° 4 (06/1999) . - p. 129-145[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006974 - Périodique Bibliothèque principale Documentaires Disponible Influence of power ultrasound on leather processing. Part I : dyeing / Jian-Ping Xie in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIV, N° 4 (06/1999)
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Titre : Influence of power ultrasound on leather processing. Part I : dyeing Type de document : texte imprimé Auteurs : Jian-Ping Xie, Auteur ; Timothy J. Mason, Auteur ; Geoffrey E. Attenburrow, Auteur ; Ji-Feng Ding, Auteur Année de publication : 1999 Article en page(s) : p. 146-157 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Application of power ultrasound (18kHz - 1MHz) to leather processing has become more viable due to increased commercial availability and advances of ultrasound technology, the apparent applicability of ultrasound across the whole breadth of "wet" processes in leather manufacturing, and tightened environmental legislation which demands new efficient processing technology. Thus power ultrasound (38 kHz, 1.36 W cm-2) has been employed in our systematic investigations on a number of leather processes. In this first part of a series of papers, the effects of power ultrasound on leather dyeing and the factors influencing the effectiveness of ultrasonic dyeing, such as timing, mechanical agitation, temperature, type of dyes, type of leather and dye concentration, have been investigated. It was found that ultrasonic dyeing can increase the degree of dye penetration by 50-120 %, shorten the process time by 40-70 %, facilitate low temperature dyeing or allow a reduction of the dye offer by 30 %. In addition, it can also improve the color fastness particularly to wet rubbing. This remarkable enhancing effect is attributed mainly to an increased diffusion coefficient of dyestuff in leather in the presence of power ultrasound. The results have shown that ultrasound. The results have shown that ultrasound is best applied in the initial stage of the dyeing for a short period of time and is most effective for a dyeing system which has difficulty in achieving high dye exhaustion or penetration. It was found that ultrasound is more effective than mechanical stirring and can be combined with mechanical agitation in accelerating the dyeing process. The influence of temperature is system dependent and there exists an optimal temperature for maximizing the effectiveness of ultrasonic dyeing. Note de contenu : - MATERIALS AND METHODS : Materials - Ultrasonic dyeing facilities - Dyeing experiments - Dyeing of leather powder - Color fastness to dry and wet rubbing
- RESULTS AND DISCUSSIONS : Effects of ultrasound on dye penetration and kinetics of leather dyeing - Effects of ultrasound on dye offer - Effects of ultrasound on color fastness to rubbing - Factors influencing the effectiveness of ultrasonic dyeingEn ligne : https://drive.google.com/file/d/1YWHYnnLrFtq_BE21fp6Cq92sTTJnKMhZ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4457
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIV, N° 4 (06/1999) . - p. 146-157[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006974 - Périodique Bibliothèque principale Documentaires Disponible
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Code-barres | Cote | Support | Localisation | Section | Disponibilité |
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006974 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |