A matched-side comparative study of the unsplit blue stock and crust leather made from uncured and pit-cured hides / Stephen H. Feairheller in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 464-480 Titre : A matched-side comparative study of the unsplit blue stock and crust leather made from uncured and pit-cured hides Type de document : texte imprimé Auteurs : Stephen H. Feairheller, Auteur ; A. L. Everett, Auteur ; J. Naghski, Auteur ; F. J. Poats, Auteur ; D. F. Holloway, Auteur Année de publication : 1975 Article en page(s) : p. 464-480 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie analytique Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux de bovins Echantillonnage Essais dynamiques Etudes comparatives Microscopie Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A matched-side study of 300 heavy steerhides was conducted jointly by Spencer Foods, Inc. and two agencies of the USDA to reexamine the economics of processing fresh, uncured hides into side upper leather in the light of efforts being made to eliminate salt from tannery and packing house effluents. In this report we present a comparison of the chemical and physical properties of leather made from uncured vs. cured sides at the wrung, unsplit blue stage and again at the dry crust stage, designed to indicate any potential quality advantage of one type of product over the other. A further effort was made to determine whether any other commercially important differences occurred, in response to processing, between the two types of stock. Analysis of the blue stock revealed that the uncured sides had a significantly higher chrome and ash content and a higher shrinkage temperature, while microscopic examination showed no difference in chrome distribution or extent of opening up of the fibers. Physical tests showed a higher tensile strength and penetrometer strength for the uncured sides but a lower ball burst extension value. The crust leather from uncured sides was equivalent to that from cured sides in sorting characteristics but had a significantly higher tensile strength. Processing differences were noted at the liming and chrome-tanning steps that appear advantageous to the processing of fresh hides. Furthermore, there was a slightly higher yield of crust leather from the uncured sides. it was concluded that it is possible, and perhaps economically advantageous, to process uncured hides by conventional processes into quality leather that is essentially indistinguishable from leather made from cured hides. Note de contenu : - Processing - Blue sort - Sampling - Chemical analysis - Microscopical evaluations - Physical tests - Crust sort - Table 1 : Pack and averge side weights at different stages of processing - Table 2 : Blue sort results - Table 3 : Chemical analyses and shrinkage temperature measurements - Table 4 : Results of physical tests on wrung unsplit blue stock - Table 5 : Results of physical tests on 5 1/2 oz. crust stock En ligne : https://drive.google.com/file/d/1IUHYNcE1Jh9veK6vuRuzeA7agnLkmK0X/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38792 [article]

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