Dépouillements

Redevelopment of medieval leathers for the curragh "Brendan's" transatlantic voyage 1976-77 / H. A. Birkin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 62, N° 3 (05-06/1978)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 62, N° 3 (05-06/1978) . - p. 55-62 Titre : Redevelopment of medieval leathers for the curragh "Brendan's" transatlantic voyage 1976-77 Type de document : texte imprimé Auteurs : H. A. Birkin, Auteur ; P. Elliott, Auteur ; C. Postles, Auteur ; A.-G. Marriott, Auteur ; R. L. Sykes, Auteur Année de publication : 1978 Article en page(s) : p. 55-62 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Archéologie Bateaux -- Conception et construction Coques (architecture navale) 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 -- Effets de la température Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés physiques Cuirs et peaux de bovins Essais de résilience Evaluation Immersion Matériaux -- Imprégnation Résistance à l'eau salée Résistance à la traction Tanins végétaux Technologie -- Moyen âge Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The paper is a descriptive account of work undertaken to re-create medieval leathers for use in an exercise in experimental archaeology—namely the Brendan voyage 1976-77. Leather for the boat's hull was made from oak-tanned ox hide impregnated with wool grease; it contained 35% dichloromethane extractables (IUC/4), had a water absorbtion (IUP/7) of 14% after 72 h, and resisted penetration by 3.5 % saline for more than 2000 h (IUP/1 1). The wooden frame was lashed together with alum tanned laces, which had a wet-breaking load of 45 kg. The transatlantic voyage of 4500 miles was completed in two stages and took 111 days (85 days at open sea), the hull leather retained its structural stability and initial water resistance. Note de contenu : - Developmment of the hull leather : Materials - Test programme - Results - Verification of performance - Table 1 : Performance of various dressed industrial leathers - Table 2 : Effects of different impregnants on the dimensional stability and water resistance of various crust leathers - Table 3 : Effect of drying sammed leagther under 10% linear extension on physical properties - Table 4 : Range of test data obtained froom leathers used construction of the hull - Table 5 : Performance of lace leathers - Table 6 : Evaluation of hull leather which had endured the transatlantic crossing - Fig. 1 : Projected route of Brendan voyage - Fig. 2 : Schematic diagram of Brendan - Fig. 3 : Effect of immersion time and temperature on apparent uptake of wool grease during static immersion. Dashed line shows fall in tensile strength with extended impregnation at 50°C - Fig. 4 : Partly constructed hull, leather laces holding the frame are in the foreground ; a line of handstitching on the hull leather can be seen top left - Fig. 5 : Brendan and crew shortly after launching En ligne : https://drive.google.com/file/d/1cgOTZjDf-45dcfFZvNyucyKSUuwzOvNo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40488 [article]

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The biodegradability of tannery chemicals / D. R. Corning in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 62, N° 3 (05-06/1978)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 62, N° 3 (05-06/1978) . - p. 63-67 Titre : The biodegradability of tannery chemicals Type de document : texte imprimé Auteurs : D. R. Corning, Auteur Année de publication : 1978 Article en page(s) : p. 63-67 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie analytique Produits chimiques -- Biodégradation Tannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Public sewage treatment authorities are often bath to accept tannery effluents because they are apprehensive either about the effects of specific components, e.g. heavy metals and sulphides on their processes, or of the high COD to BOD ratios which have been cited as indicating non-biodegradability. Real resistance to treatability is even more relevant to onsite biological treatment by the tannery. The work described below was undertaken to investigate both of these aspects. Laboratory trials were carried out, using various techniques, to examine the inherent treatability of a number of tanning materials, dyestuffs and other chemicals widely used in tannery processes. Later, one of the techniques was employed in a study of the treatment of a mixed effluent, the work subsequently being extended to pilot plant operation in a tannery. Note de contenu : - EXPERIMENTAL TECHNIQUES : Laboratory scale activated sludge plants (ASP) - Respirometry - FINDINGS : Tanning agents - Biocides - Dyestuffs - Fig. 1 : Laboratory ASP - Fig. 2 : Respirometer cell - Fig. 3 : Respirometer trials, typical growth curve - Fig. 4 : COD changes, tan/sewage mixture in ASP - Fig. 5 : BOD changes, tan/sewage mixtures in ASP - Fig. 6 : Laboratory ASP trials, treatment of sewage/tannery effluent mixtures - Fig. 6a : Effect of phosphate addition on removal efficiency - Fig. 7 : Pilot scale ASP : general arrangement - Table 1 : Respirometer trials, replacing standard nutrients with tans to maintain constant initial COD levels - Table 2 : Addition of biocides to "standard" respirometer eco-systems - Table 3 : Reduction of oxygen demands in ASP dyes (0.01 %) in domestic sewage En ligne : https://drive.google.com/file/d/15D7ZWgPlD6TJTlQc5pojaSGtrXirn8eh/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40489 [article]

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