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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Code-barres	Cote	Support	Localisation	Section	Disponibilité
008508	-	Périodique	Archives	Documentaires	Exclu du prêt

Correlation of chrome and fat content with leather strength / E. H. Bitcover in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXIII (Année 1978)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXIII (Année 1978) . - p. 121-125 Titre : Correlation of chrome and fat content with leather strength Type de document : texte imprimé Auteurs : E. H. Bitcover, Auteur ; A. L. Everett, Auteur Année de publication : 1978 Article en page(s) : p. 121-125 Note générale : Bibliogr. Langues : Américain (ame) Catégories : 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. Cuir -- teneur en chrome Cuirs et peaux -- Propriétés physiques Cuirs et peaux -- Teneur en matières grasses Cuirs et peaux de bovins Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In a previous study a variety of physical properties and sorting character-istics of combat boot leathers made from comparable bullhides and steerhides were closely compared. The cattle involved had similar genetic and management backgrounds as well as similar ages and slaughter weights. That study anticipated a possible trend towards raising young bulls for beef because of potential economic advantages. Results of the study indicated that leather from bullhide was significantly stronger by a number of standard tests than leather from steer-hide. Since the leathers had been processed in three different tannery lots, there was latex some question as to whether this had produced differences in chemical composition which could result in differences in physical properties. Note de contenu : - Table 1 : Average chemical composition of crust leathers (percent) - Table 2 : Average physical test results for crust leathers - Table 3 : Correlation of physical test results with chrome and fat content of 39 crust sides En ligne : https://drive.google.com/file/d/1t4ffoRfjm_dOE5pXSaxVgV8bDBGFBZB3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41148 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
011628	-	Périodique	Bibliothèque principale	Documentaires	Exclu du prêt

Distribution of lipid classes with respect to area and stratigraphic location in a steerhide / E. H. Bitcover in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXI (Année 1966)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXI (Année 1966) . - p. 338-350 Titre : Distribution of lipid classes with respect to area and stratigraphic location in a steerhide Type de document : texte imprimé Auteurs : E. H. Bitcover, Auteur ; Edward F. Mellon, Auteur Année de publication : 1966 Article en page(s) : p. 338-350 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bouvillon Le terme "bouvillon" est couramment utilisé pour désigner un jeune boeuf ou bovidé qui a été châtré. Cuirs et peaux de bovins Extraction (chimie) Lipides Séparation (technologie) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Variability in the lipid content from one area of a hide to another has prevented accurate comparisons of the chemical compositions of hides. Since the various lipid constituents are the result of different biological processes and serve different purposes within the hide, the contents of certain lipids vary more than others within the hide. In these studies the lipid components were determined in each of five stratigraphic layers taken from 11 areas which represented about two-thirds of the area of the right side of a steerhide. There was considerable variability in the content for each lipid class, both areawise and stratigraphically. The lipids on the coarse-clipped and fine-clipped hair were determined for nine areas, and these also showed considerable variability. Note de contenu : - Preparation of material - Extraction of lipids - Separation of lipid classes - Solvents - Table 1 : Stratigraphic composition of the lipid constituents of a steerhide En ligne : https://drive.google.com/file/d/16q8gM0F749v_Z_KfqxLyqWNoGDjSNRSA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37943 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
008496	-	Périodique	Archives	Documentaires	Exclu du prêt

Modified processing cockle defect in sheepskins / E. H. Bitcover in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXV (Année 1980)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXV (Année 1980) . - p. 49-53 Titre : Modified processing cockle defect in sheepskins Type de document : texte imprimé Auteurs : E. H. Bitcover, Auteur ; H. J. Willard, Auteur ; A. L. Everett, Auteur Année de publication : 1980 Article en page(s) : p. 49-53 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : - Dewooling - Reliming - Bating - Pickling Note de contenu : The cause of cockle defect in domestic sheepskins has been demonstrated. It is caused by keds (melophagus ovinus), which are blood-sucking parasites that live in the wool of sheep. The defect becomes apparent only after the wool is removed during processing. It appears as a scattering of dense nodules in the grain layer of sheepskins in a characteristic pattern of distribution. Affected sheepskin leathers can be seriously downgraded, depending on the severity of the defect. In addition, cockle reduces the physical strengh of both grain and suede leathers and increases their stiffness. Our earlier studies entailed special processing to expose the cockle nodules for easier counting. When subjected to certain process modifications, however, which were suggested by a cooperating tanner, sheepskins resulted that had lower apparent cockle counts and improved appearence. This paper describes certain process modifications which were found effective in attenuating some of the grosser defects in cockled sheepskins. En ligne : https://drive.google.com/file/d/1dzw6maIQs4fQ2BYG4WXDvuXXK0EXriw8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17726 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
008513	-	Périodique	Archives	Documentaires	Exclu du prêt

Pilot-plant study of flocculation of suspended solids in lime-sulfide unhairing effluents / E. H. Bitcover in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXV (Année 1980)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXV (Année 1980) . - p. 108-118 Titre : Pilot-plant study of flocculation of suspended solids in lime-sulfide unhairing effluents Type de document : texte imprimé Auteurs : E. H. Bitcover, Auteur ; J. E. Cooper, Auteur ; David G. Bailey, Auteur Année de publication : 1980 Article en page(s) : p. 108-118 Note générale : bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : We have studied that removal of suspended solids from commercial unhairing effluents by means of a pilot-plant continuous flow apparatus. effluents were obtained from tanneries which processed either fresh or salt-cured hides in paddle vats or hide processors. Approximately 80 to 85 percent of the suspended solids were removed from the effluents tested. The results subtantiate earlier laboratory studies that established the ranges of effluent compositions (pH, salt content, suspended solids, and soluble organic content) for which specific flocculation treatments are effective. Note de contenu : - Unhairing wastes - Flocculating agents - Composition variables - Analytical methods En ligne : https://drive.google.com/file/d/1DYeyr3Si9CwlyngNbbaU7PoHivAjk1FA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17730 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
008513	-	Périodique	Archives	Documentaires	Exclu du prêt

Use of TOC as an alternative to COD for monitoring the biooxidation of tannery unhairing waste / J. E. Cooper in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXV (Année 1980)  

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