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)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 6 (11-12/2004) Titre : Auxiliary agents with non-swelling capacity used in pickling-tanning processes - Part 4 Type de document : texte imprimé Auteurs : Agusti Marsal, Auteur ; Ramón Palop, Auteur ; V. Frias, Auteur ; M. D. de Castellar, Auteur ; Pedro J. Celma, Auteur ; Albert M. Manich, Auteur Année de publication : 2004 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents anti-gonflement Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de moutons 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 Résistance à la déchirure Résistance à la traction Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The reduction in the use of salt in pickling due to the application of different chemicals with non-swelling capacity - polyacrylic acid, naphthol 3-6-disulphonic acid, p-hydroxydiphenyl sulphonic acid and a blend of naphthalene and naphthol sulphonic acids- has been studied in previous papers.1-3 These chemicals were applied in the pickling process either alone or with small amount of salt. In Part I1, it was confirmed that the blend of naphthalene and naphthol sulphonic acids at an offer of 3% (on pelt weight) and at a salinity of 2°Bé could be a valid alternative since it adequately prevented the swelling of hides. Tanning treatments with conventional chromium salts yielded the correct shrinkage temperatures. In Part II2 it was observed that the conventional tanning process of hides pickled with sulphuric acid and 3% (on pelt weight) of the blend of naphthalene and naphthol sulphonic acids at a salinity of 2°Bé yielded leathers that could be acceptable as far as physical properties and handle were concerned. However; these leathers showed an irregular stratigraphic distribution of Cr2O3 and a marked colour difference between grain and flesh sides. Optimization of the tanning process of these hides confirmed that the best results were obtained with a strongly masked chromium salt with a very low basicity. In Part III3, the possible application of chemicals with non-swelling capacity to reduce the use of salt in the pickling process of sheepskins was studied. In this case, the use of a strongly masked chromium salt with a very low basicity in the tanning process was not necessary since conventional tanning salts were adequate. The best results in terms of non-swelling capacity, shrinkage temperature of the tanned hides, conductivity and Chemical Oxygen Demand of the residual baths were achieved under the following conditions: 2% p-hydroxydiphenyl sulphonic acid (salinity 2°Bé); 2% naphthol 3-6-disulphonic acid (salinity 2°Bé) and 4% polyacrylic acid (salinity 2°Bé). Note de contenu : - AIM OF THE WORK - EXPERIMENTAL PROCEDURE : Pickle and tannage - Process evaluation - RESULTS : Swelling of the pickled/tanned skins - Evaluation of the pickling and tanning residual baths - Leather characteristics - APPENDIX : Chemicals utilized in this work - Table 1 : Comparative study between pickling processes - Table 2 : Post-tanning processes - Table 3 : Thickness variation (%) after pickling/tanning in relation to bating - Table 4 : Evaluation of the pickling and tanning residual baths - Table 5 : Leather characteristics as a function of the pickling process - Table 6 : Tensile strength (IUP 6) - Table 7 : Tear Resistance (IUP 8) - Table 8 : Measurement of distension and strength of the grain by the Ball Burst Test (IUP 9) En ligne : https://drive.google.com/file/d/1KGJNb1N6N3BJ-enzwHjtuzRzbeI92kqw/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39617 [article]

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Influence of finishing formulations on static charge dissipation of leather / Agusti Marsal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 82, N° 2 (03-04/1998)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 82, N° 2 (03-04/1998) . - p. 59-63 Titre : Influence of finishing formulations on static charge dissipation of leather Type de document : texte imprimé Auteurs : Agusti Marsal, Auteur ; L. Labastida, Auteur ; Albert M. Manich, Auteur ; M. D. de Castellar, Auteur ; R. Sauri, Auteur ; J. Cot, Auteur Année de publication : 1998 Article en page(s) : p. 59-63 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7866 [article]

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Stretching and stress-relaxation of leather / Albert M. Manich in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 3 (05-06/2006)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 90, N° 3 (05-06/2006) . - p. 102-107 Titre : Stretching and stress-relaxation of leather Type de document : texte imprimé Auteurs : Albert M. Manich, Auteur ; M. D. de Castellar, Auteur ; B. Gonzàlez, Auteur ; M. Ussman, Auteur ; Agusti Marsal, Auteur Année de publication : 2006 Article en page(s) : p. 102-107 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de bovins Densité Etirement (mécanique) Matériaux -- Epaisseur Relaxation des contraintes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Four bovine leathers subjected to five stretching procedures in water at temperatures between 60 and 80°C with drawing ratios between 1.20 and 1.40 were analyzed to demonstrate the suitability of Nutting’s model to fit the stress-relaxation of samples strained at 20%. The influence of the specimen direction and the mechanical conditioning (subjected to two cycles of straining at different pre-loading level from 0.5 to 10daN) were considered. Nutting’s model gives estimators of the initial stress and the relaxation rate. The initial stress is influenced by stretching treatments, specimen direction and mechanical conditioning. The influence of the stretching treatments on the relaxation rate depends on the stretching ratio, temperature and type of leather. Note de contenu : - MATERIALS AND METHODS : Samples - Stretching procedure - Leather thickness and apparent density - Fitting Nutting's Relaxation Model - - RESULTS AND DISCUSSION : Thickness and Apparent Density - Stress relaxation - Table 1 : Drawing ratio, thickness and apparent density of the original and stretched samples - Table 2 : Initial Stress, Nutting’s law coefficients and correlation coefficients of Sample 1 and samples stretched by treatments A1 and A according to the pre-loading level and specimen direction - Table 3 : Initial Stress, Nutting’s law coefficients and correlation coefficients of Sample 2 and sample stretched by Treatment B according to the pre-loading level and specimen direction - Table 4 : Initial Stress, Nutting’s law coefficients and correlation coefficients of Sample 3 and sample stretched by Treatment C according to the pre-loading level and specimen direction - Table 5 : Initial Stress, Nutting’s law coefficients and correlation coefficients of Sample 4 and sample stretched by Treatment D according to the pre-loading level and specimen direction En ligne : https://drive.google.com/file/d/1iFSUUqLpfmPQZYO3i3qIQDfzVWW7ReQP/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39141 [article]

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Study of the dissipation of the electrostatic charge of leather / Agusti Marsal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 79, N° 4 (07-08/1995)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 79, N° 4 (07-08/1995) . - p. 115-118 Titre : Study of the dissipation of the electrostatic charge of leather Type de document : texte imprimé Auteurs : Agusti Marsal, Auteur ; Albert M. Manich, Auteur ; M. D. de Castellar, Auteur ; J. Cot, Auteur Année de publication : 1995 Article en page(s) : p. 115-118 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This work is focused on the influence of tanning, the type of finishing, presence of carbon black and humidity on the electric conductivity of leather measured as semi-discharge time using a Rothschild Static Voltmeter. It isobserved that the presence of humidity is the determining factor in the electrical conductivity of leather and that the influence of the other factors (tanning, type of finishing and carbon black) must be measured on dry leather. Chrome tanning and carbon black improve the electric conductivity of leather as does mixed and cationic finishing. En ligne : https://drive.google.com/file/d/1F00iYVME2gqhvdxxHWvgM_UgxfcTOPsp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8215 [article]

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