Are carcinogens a chronic health hazard in the tannery workplace ? / Robert M. Lollar 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. 510-525 Titre : Are carcinogens a chronic health hazard in the tannery workplace ? Type de document : texte imprimé Auteurs : Robert M. Lollar, Auteur Année de publication : 1980 Article en page(s) : p. 510-525 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Three clinical studies have associated employment in the leather and leather products industries with cancer, but they have not identified tanning and finishing operations specifically. The dust that is characteristically created in the manufacture of leather goods is most often suggested as a significant factor. However, many of the chemicals used in the leather tanning industry are classified as carcinogenic. An analysis of the potential risks of exposure to these chemicals is presented in this paper, along with suggestions for proper practices of handling them. The classes of materials are nitrosamines, benzidine-based direct dyestuffs, chromate pigments, aromatic organic solvents, and tannins. Note de contenu : - NATIONAL OCCUPATIONAL HEALTH SURVEY - CASE HISTORY STUDIES - CHEMICAL CARCINOGENS : Nitrosamines - Benzidine-based dyestuffs - Chromate pigments - Aromatic organic solvents - Tannin En ligne : https://drive.google.com/file/d/1rW-iHqgra-wOKqAxOeYeaaVtaA_wTjeA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17802 [article]

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Chromium management for tanneries / Robert M. Lollar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIV (Année 1989)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXIV (Année 1989) . - p. 272-277 Titre : Chromium management for tanneries Type de document : texte imprimé Auteurs : Robert M. Lollar, Auteur Année de publication : 1989 Article en page(s) : p. 272-277 Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : As many of you know chromium compounds and their environmental management have been a major focus of my activities during the past fifteen years. I have been requested by Paul Finnegan to present an overview of chromium and its environmental management as it pertains to our industry today. En ligne : https://drive.google.com/file/d/1wbSML5N-XbvdIZMjXywgoQr-9qORK5tF/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17363 [article]

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Halophilic bacteria thrive in seasonal cycles / Waldo E. Kallenberger in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXI (Année 1986)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXI (Année 1986) . - p. 248 - 264 Titre : Halophilic bacteria thrive in seasonal cycles Type de document : texte imprimé Auteurs : Waldo E. Kallenberger, Auteur ; Robert M. Lollar, Auteur Année de publication : 1986 Article en page(s) : p. 248 - 264 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Extremely halophilic bacteria are physiologically unique bacteria. Such unique halophilic bacteria are probably common seasonally on cured hides and in curing brines. The halophiles have been associated with bright pink, red and purple discolorations on salt-cured hides for many years but have not been definitively linked to hide substance deterioration. Several extremely halophilic bacterial types were isolated from cured hides and hide curing brines for study. Several of these isolates were found to be capable of digesting hide protein. A high correlation between collagenolytic activity and gelatinolytic activity was noted, thus indicating a simple and quick potential test for hide damaging halophiles. One of the more potent hide damaging halophiles was studied more closely. This halophile is similar in many major characteristics to Halobacterium salinarium. The one significant dissimilarity is that this halophile, as well as all other halophilic isolates, grew well in nutrient broth supplemented with a small amount of gelatin in solution as well as in brines with hide pieces. Halobacterium salinarium is not believed capable of strong growth in liquid media. It is suggested that gelatin or collagen are critical substrates for liquid media. It is suggested that gelatin or collagen are critical substrates for liquid media growth. Growth is very slow in liquid media. In laboratory test and raceway trials hexavalent chromium proved to be an effective control agent for collagenolytic extreme halophiles. As little as 10ppm hexavalent chromium was effective in controlling halophiles in laboratory experiments, but dirty raceway brines required higher chromium concentration. Use of chromium in commercial operation may be regulated by local, state, or federal agencies, therefore such regulations and laws applicable to any particular operation should be considered before use. Other promising control measures include temperature control. These halophiles required high temperatures (greater than 30°C) to grow well and are destroyed by moderately higher temperatures (greater than 60°C). En ligne : https://drive.google.com/file/d/1pQsgKMAr7cuXf8tw5atm95ilfCYs1evk/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9178 [article]

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Potential uses of tanned collagen / Robert M. Lollar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XXVII (Année 1982)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XXVII (Année 1982) . - p. 311-320 Titre : Potential uses of tanned collagen Type de document : texte imprimé Auteurs : Robert M. Lollar, Auteur Année de publication : 1982 Article en page(s) : p. 311-320 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène Tannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The U.S. leather tanning and finishing industry converts about 175,000 tons of collagen each year in making leather. However, an estimated 60,000 to 70,000 tons of this collagen is not converted into consumer leather goods; this portion becomes offal products such as chrome-in-the blue trimmings and shavings, and buffing dust and trimmings from crust and finished leather at tanneries or leather products manufacturing plants. Fiber uses ( e.g., leatherboard ), glue and feed and fertilizer utilize a significant share of this offal tanned collagen. However, a growing share is disposed of in landfill sites which are becoming increasingly costly and difficult to secure. New uses for this tanned collagen being disposed of at landfills are therefore needed. This paper will be a status report on the developmental efforts. Energy and chromium recovery by incineration or pyrolysis are potential procedures. Chromium recovery is especially desirable since sources for U.S. chromite ores are primarily foreign. Since about 17 percent of the total U.S. demand for sodium dichromate is used by the tanning industry, recovery of the underutilized chromium would lessen our ore import level as weel as avoid landfill utilization. The value of recovering the energy would depend on the establishment of a more direct relationship to the needs of the industry. This paper will analyze techno-economic limitations which must be resolved before these potential resource recovery concepts can become commercial. Note de contenu : - Chromium-tanned leather offals - Wastewater sludge - Chromium values in tannery offals En ligne : https://drive.google.com/file/d/1hdkjEiXrswWoKlO9V-Qi8cc_RJjHniYg/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17461 [article]

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Rapid determination of moisture in cured hides by microwave oven / Waldo E. Kallenberger in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXIV (Année 1979)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXIV (Année 1979) . - p. 454-468 Titre : Rapid determination of moisture in cured hides by microwave oven Type de document : texte imprimé Auteurs : Waldo E. Kallenberger, Auteur ; Robert M. Lollar, Auteur Année de publication : 1979 Article en page(s) : p. 454-468 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Séchage Cuirs et peaux -- Teneur en humidité Micro-ondes Statistique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Moisture content is important for cured bides, both in terms of raw stock quality and cost. Using a microwave oven and minimal sample preparation, determination of the moisture in cured hides can be made in less than one-half hour ; other methods require hours or days. Analytical data on the moisture in cured hides determined by the usual vacuum oven method correlate very well with the microwave oven determinations. The microwave oven method is fast, easy, and reliable. Note de contenu : - Experimental methods and data - Statistical evaluation - Table 1 : Vacuum oven drying method : A. Hair left on samples - Table 2 : Vacuum oven drying method : B. Hair removed from samples - Table 3 : Microwave oven drying method : A. Hair left on samples - Table 4 : Microwave oven drying method : B. Hair removed from samples - Table 5 : Regression values En ligne : https://drive.google.com/file/d/1iAIPnMWOoWIAy4ehaZQlaF9UNOQU2afV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37226 [article]

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The chemistry leather manufacture, volume I / Fred O'Flaherty / New York [Etats-Unis] : Reinhold Publishing Company (1956)

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The chemistry leather manufacture, volume II / Fred O'Flaherty / New York [Etats-Unis] : Reinhold Publishing Company (1958)

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The chemistry leather manufacture, volume III / Fred O'Flaherty / New York [Etats-Unis] : Reinhold Publishing Company (1962)

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