A simple approach to leather process investigation / P. Laight in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 1-11 Titre : A simple approach to leather process investigation : Part 1 - The introduction of variants in the liming, conditioning/staking and retannage/fatliquoring sub-processes Type de document : texte imprimé Auteurs : P. Laight, Auteur ; A. G. Ward, Auteur ; S. Wolstenholme, Auteur Année de publication : 1976 Article en page(s) : p. 1-11 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chaulage Conditionnement Cuirs et peaux Palissonnage Produits de nourriture du cuir Retannage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The process, already described in J. Soc. Leather Tech. Chem. (1974), 58, 88, for making standard segments of chrome tanned upper leather, has been modified by the introduction of selected variants. The subprocesses which have been varied are: (i) liming; (ii) staking and conditioning; (iii) retannage and fatliquoring. Control segments made by the unmodified standard process have been included as a part of each pack. In addition to measurements made during processing, the leathers produced have been assessed for their main mechanical properties, using both subjective and objective methods. The results show the exceptional reproducibility of the standard process itself and so enable the effects of the variants to be reliably assessed. The marked effect of increased duration of liming on subjective properties is not reflected in all the physical test results. The degree of staking employed (Mollisa) resulted in significant differences in subjective properties and in the stress/strain properties for low strains. The use of glutaraldehyde retannage and of a higher level of fatliquor produced significant differences in certain of the mechanical properties which were measured or assessed. Statistical analyses have been applied to the results of the factorial designs employed. Note de contenu : - The standard process and the leathers produced from it (Packs 1-5) - The liming variant - The conditioning/staking variant - Table 1 : Water content as a percentage of dry fat free solids of pelt equilibriated with pH 3-72 buffer - Table 2 : Variants introduced in the standard chrome side leather process - Table 3 : Test results on completion of sub-process. Standard process II. Means, ranges and range of admissible variation (RAV) packs 4 and 5 - Table 4 : Mean values of test results for leathers front packs 1 and 2 (standard process I), pack 3 (standard process I with delays in brine and chrome pile), packs 4 and 5 (standard process II). For tensile specimens AI, M4, P4 perpendicular to backbone, M2 parallel to backbone - Table 5 : Standard process H, packs 4 and 5. Mean values and the confidence limits for packs and sub-packs of two or four segments. (mean ± A gives the confident limits) - Table 6 : Overall average values (packs 1 to 9) of 72 segments for weight and area during processing. Area values for sub-processes prior to drying are compared (as %) with the original area, for drying and after estimates are used, correcting for trimming of one end. Weights are related to the appropriate stages at which material was removed (original, lime splitting, shaving, end trimming) - Table 7 : Comparison of standard (mean packs 4, 5), and lime variant (mean packs 1, 2) leathers. student's "t" test (30 degrees of freedom). Calculated "t" values - Table 8 : Comparison of standard (mean packs 4, 5) and lime variant (mean packs 1, 2) leathers. student's "t" test (30 degrees of freedom), calculated "t" values - Table 9 : Conditioning/dtaking bariant. Allocation of degments 41-48 were collected from slaughter house one week before 49-56 - Table 10 : Overall treatment means for the Pairs of segments receiving identical conditioning/staking levels - Table 11 : Two-way table of means for whole Segment subjective break values. Conditioning/staking variant - Table 12 : Two-Way Table of means for stress at 10% extension (kg cm-2). Conditioning/staking variant - Fig. 1 : Location of segment and test squares on the side En ligne : https://drive.google.com/file/d/1vj-qu2LdEERKvqdUQgzHaRr0le_y0-qW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35263 [article]

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