Comparative physical properties of leather from young bull hides and steerhides / E. H. Bitcover in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXIX (Année 1974)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXIX (Année 1974) . - p. 508-522 Titre : Comparative physical properties of leather from young bull hides and steerhides Type de document : texte imprimé Auteurs : E. H. Bitcover, Auteur ; A. L. Everett, Auteur ; W. E. Palm, Auteur ; W. Windust, Auteur ; J. Naghski, Auteur Année de publication : 1974 Article en page(s) : p. 508-522 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Boeufs domestiques 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 -- Propriétés mécaniques Cuirs et peaux -- Propriétés physiques Cuirs et peaux de bovins Etudes comparatives Taurillon Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The potential economic advantage of raising young bulls for beef may soon result in a significant increase in the proportional numbers of such hides on the market. A detailed study was therefore undertaken to indicate whether any important differences in leather properties might be expected from this new material compared with conventional steerhides. A total of 38 bull sides and 30 steer sides in the crust were evaluated by means of five different test procedures at each of 12 anatomical locations. The buil sides were found to be significantly stronger by every test except the experimental penetrometer test, which showed no real difference. Distribution of strength by location was essentially similar in all cases. Sorting of finished sides revealed a trend towards visible neck wrinkles in the bull hide leather. Since the experimental hides came from an inbred line of Hereford cattle, the incidence of the vertical fiber defect, which is thought to be genetically controlled, was of special concern. Six hides from bulls and vine from steers were definitely defective and were excluded from the strength comparisons. This is the first known report of the defect in bulls. Note de contenu : - EXPERIMENTAL : Hide source - Leather processing - Physical testing - Statistical analysis - RESULTS AND DISCUSSION : Sorting characteristics - Physcal properties - Statistical interpretation - Strength distribution - Incidence of vertical fiber defect En ligne : https://drive.google.com/file/d/1bkc85ko90spJ5qJbgKN8w095Ic9eJkVk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41373 [article]

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Prediction of leather strength from needle penetrometer measurements on wet blue stock after splitting / A. L. Everett in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXI (Année 1976)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXI (Année 1976) . - p. 448-464 Titre : Prediction of leather strength from needle penetrometer measurements on wet blue stock after splitting Type de document : texte imprimé Auteurs : A. L. Everett, Auteur ; W. E. Palm, Auteur ; E. H. Bitcover, Auteur ; Henri J. Scherr, Auteur ; G. V. Metzger, Auteur Année de publication : 1976 Article en page(s) : p. 448-464 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Propriétés mécaniques Mesure -- Instruments Pénétration (physique) Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The previously described ERRL penetrometer was applied to butt samples from 185 blue sides, after splitting for grain upper leather, to evaluate its accuracy in selecting the weak sides in the lot at an intermediate stage of processing. Two new types of needles were compared with the one previously used ; these evaluations were supplemented by microscopic and ball-burst tests. Corresponding samples were similarly tested at the crust and finished stages. Scoring of the composite data identified 34 weak sides in the lot, many with vertical fiber defect. Using appropriate cutoff points as a basis for sorting, each of the three needles gave acceptable results, but the one with a 100 taper was superior for several reasons. It improved the concentration of strong sides from the original 82 percent to a final 94 percent in the strong sort while segregating a weak group with 71 percent accuracy, which compared reasonably with experimental sorting in the crust by the destructive hall-burst or microscopie tests. Good correlation was also shown statistically between penetrometer measurements in the blue and hall-burst in the crust. This good predictability, coupled with its sorting performance and nondestructive nature, makes the penetrometer test a useful and practical tool for sorting blue stock after splitting. Other comparisons of test values with the ball-burst, within and between different stages of processing, were also evaluated in the form of correlation coefficients. Note de contenu : - EXPERIMENTAL : - Sampling of test sides - Testing procedure - Needle variations - Evaluation of measurements - RESULTS AND DISCUSSION : - Exploratory needle tests - Average test values - Cutoff points - Sorting results - Hair color vs. strength - Correlation with ball-burst - Correlation with thickness En ligne : https://drive.google.com/file/d/1-MyDbIsNhO2LSEJ5TA3n9DBR2sPu-tU0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41496 [article]

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