Bactericides for pre-treatment in suspension drying of hides and skins : 1981 field trials in the Gambia / J. C. Barrett in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 67 (Année 1983)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 67 (Année 1983) . - p. 74-85 Titre : Bactericides for pre-treatment in suspension drying of hides and skins : 1981 field trials in the Gambia Type de document : texte imprimé Auteurs : J. C. Barrett, Auteur Année de publication : 1983 Article en page(s) : p. 74-85 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antibactériens Borique, Acide 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 -- Conservation Cuirs et peaux -- Séchage Fluorure de silicium Fluorures Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Protection against development of putrefaction during suspension drying of hides during the West African wet season was investigated. Hides were dipped for 60 min in a saturated solution of sodium silicofluoride or boric acid or sprayed with a 10% solution of Vantocil IB immediately after flaying and fleshing. Both boric acid and silicofluoride treatments gave effective protection without adverse effect on leather-making quailties of the treated stock. The Vantocil spray treatment gave a significant improvement in preservation compared to untrerated hides but was not as effective as the boric acid or silicofluoride dip treatments. At present the use of silicofluoride is promising as the most cost-effective treatment. Note de contenu : - METHODS : Preservation treatment - Selection, preparation and handling of raw material - Drying rates and moisture content - Development of staleness during drying - Evaluation of quality of cure - Evaluation of hide quarters during tannery processing - Evaluation of the crust leathers - RESULTS : Moisture content and drying raies - Development of staleness during drying - Observations during tannery processing - Observations on the crust leathers - DISCUSSION : Preservative effect of the different treatments - Comments on the TTC and gelatin film test results - Comments on chemical analysis - Effects on leather-making properties - Cost-effectiveness En ligne : https://drive.google.com/file/d/1pUVjUIBhypPOBOJWEr22I5A_2VepoRRw/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34189 [article]

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Bactericides for pre-treatment in suspension drying of hides and skins : a review / J. C. Barrett in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 67 (Année 1983)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 67 (Année 1983) . - p. 31-40 Titre : Bactericides for pre-treatment in suspension drying of hides and skins : a review Type de document : texte imprimé Auteurs : J. C. Barrett, Auteur Année de publication : 1983 Article en page(s) : p. 31-40 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antibactériens Cuirs et peaux -- Conservation Cuirs et peaux -- Séchage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the tropical wet season, for example in West Africa, putrefaction of hides and skins during suspension drying is significant but may be reduced by pre-treatment of the raw stock with a bactericide. A suitable chemical must be cost-effective, have no adverse effects on leather-making qualities and acceptable with respect to health, safety and the environment. For application in less developed countries and small throughputs, a simple method of application with minimum expertise in process control is required. The chemical must remain effective during drying. The purpose of this paper is to review chemicals which have been used previously either as salt additives or for salt-free short-term preservation of hides and skins, with a view to potential application in suspension drying. Among inorganic chemicals, boric acid and sodium silicofluoride appear most promising and zinc compounds may have limited potential. Sulphites, chlorites, hypochlorites and sodium carbonate are less attractive. Among organic and proprietary chemicals, Vantocil IB presently offers most potential. Phenol and cresol type preservatives have several disadvantages, although sodium pentachlorophenate may have value as an auxiliary in spray treatment. Naphthalene and derivatives, quaternary ammonium compounds (benzlkonium chloride) and various proprietary chemicals of current interest for salt-free short-term preservation also have disadvantages. The use of antibiotics and medicinal compounds is discouraged. Note de contenu : - Factors in assessment of bactericides - Inorganic chemicals : Boric acid - Sodium silicofluoride - Zinc compounds - Sulphites, bisulphites and metabisulphites - Chlorites and hypochlorites - Sodium carbonate - Organic chemicals : Phenols, cresols and derivatives - Naphthalene and derivatives - Quaternary ammonium slts - Antibiotics and medicinal compounds - Miscellaneous proprietary compounds - Table 1 : Miscellaneous proprietary products investigated for hide and skin preservation En ligne : https://drive.google.com/file/d/1cxLVwXR1U1uMUzCMMxtF1QfT3HIrPApc/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34186 [article]

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Short-term preservation of hides in Zimbabwe / J. C. Barrett in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 70 (Année 1986)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 70 (Année 1986) . - p. 83-89 Titre : Short-term preservation of hides in Zimbabwe Type de document : texte imprimé Auteurs : J. C. Barrett, Auteur Année de publication : 1986 Article en page(s) : p. 83-89 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The Cold Storage Commission produces some 450 000 hides per year wich at present are preserved by salting. This is causing effluent problems at abbatoirs and tanneries and there is great interest in alternative preservation systems, particularly for those hides destined for the local tanning industry where short-term preservation would be adequate. This paper reviews the scope for salt-free preservation of hides in Zimbabwe by improved drying methods, chemical reduction of water activity, radiation sterilisation, chilling, freezing and treatment with bactericides. The overall conclusion is that prospects appear good for developing a short-term hide preservation system appropriate to the needs of the Cold Storage Commissionin Zimbabwe. The most promising systems are based on chilling or treatment with bactericides such as benzalkonium chloride, boric acid Vantocil IB (ICI plc), Busan 30 and Busan 52 (Buckman Laboratories). Each system has different implications for capital costs, operating costs and flexibility in production, storage and marketing. Laboratory studies and field trials comparing selected treatments will be described in subsequent papers. En ligne : https://drive.google.com/file/d/11Z349xH_S5Mf5CzvlcsXJIo4ea1TErEr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9211 [article]

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The recycling of silicofluoride and boric acid liquors for hide preservation / J. C. Barrett in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 68 (Année 1984)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 68 (Année 1984) . - p. 146-149 Titre : The recycling of silicofluoride and boric acid liquors for hide preservation Type de document : texte imprimé Auteurs : J. C. Barrett, Auteur ; I. B. Leach, Auteur ; M. R. Ascough, Auteur Année de publication : 1984 Article en page(s) : p. 146-149 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bain de trempe -- Recyclage Borique, Acide Cuirs et peaux -- Conservation Fluorure de silicium Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Suspension drying is a long-established method of curing hides and skins still practised today in many parts of the world, but a major disadvantage is that adverse climatic conditions can cause major Tosses. For example, in West Africa during the wet season putrefaction of hides caused by delayed drying is extensive. Barrette reviewed bactericidal chemicals potentially suitably for treatment of hides and skins prior to drying to avoid this problem and selected methods were evaluated in field trials in the Gambia in 1981. The immersion of cattle hides in a saturated solution of either sodium silicofluoride (SSF) or boric acid for 60 min after flaying and fleshing prior to conventional suspension drying was found to give effective protection against putrefaction during drying periods of up to six days. No adverse effects on leather-making qualities of the raw stock could be attributed to the bactericidal pre-treatments. A practical system for pre-treating hides with bactericides will benefit from recycling of dip liquors to achieve economy in chemical usage. This paper describes experiments carried out in the Gambia in 1982 to investigate the scope for recycling SSF and boric acid liquors for hide preservation. Experiments were also carried out to investigate the scope for reducing the period of immersion of hides while retaining effective preservation. Note de contenu : - Raw material - Preliminary experiments on reduced treatment time - Experiments on receiving unreplenished bactericide liquors : Results with SSF - Results with boric acid - Experiments on recycling replenished SSF liquors - Investigation of the "exhaustion" of recycled SSF liquors - Table 1 : Assessment of hide quality in unreplenished SSF liquor recycling experiments - Table 2 : Assessment of hide quality in unreplenished boric acid liquor recycling experiments - Table 3 : Assessment of hide quality in unreplenished boric acid liquor recycling experiments En ligne : https://drive.google.com/file/d/1xqamOshukt7PNwdxPWvhdu4ixPXuqhni/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34151 [article]

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