Assessment of vegetable tannin extracts by colorimetry / Timothy D. Stilwell in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 6 (06/2001)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 6 (06/2001) . - p. 192-204 Titre : Assessment of vegetable tannin extracts by colorimetry Type de document : texte imprimé Auteurs : Timothy D. Stilwell, Auteur ; Bruce W. Buehrig, Auteur ; Robert J. Harvey, Auteur ; L. Shepley Hermann, Auteur ; Jean J. Tancous, Auteur Année de publication : 2001 Article en page(s) : p. 192-204 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Spray-dried, untreated wattle and treated quebracho extracts were tested for color by four laboratories equipped with Lovibond Tintometers. A comparison of color readings was conducted at the U.S.H.S.L.A. Laboratory where more reasonably priced meters, a Jenway Colorimeter and a Milton-Roy Spectrophotometer, were used. Time for testing was shortened considerably because preliminary tannin analyses were not done and the meters were simpler to operate. Samples of extracts were weighed, dissolved in distilled water, heated to 82oC, cooled and read immediately. A ratio, constructed by dividing yellow readings by red readings, was found to be a valuable method for understanding factors that influence color such as pH and addition of reagents. En ligne : https://drive.google.com/file/d/149LW5NP9yrPYRBQMilRHVQ4FIsZpsm8H/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4371 [article]

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A comparative investigation of sperm oil analogs and sulfated sperm oil / Jean J. Tancous in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXVI (Année 1981) . - p. 60-73 Titre : A comparative investigation of sperm oil analogs and sulfated sperm oil Type de document : texte imprimé Auteurs : Jean J. Tancous, Auteur ; Brian McBane, Auteur Année de publication : 1981 Article en page(s) : p. 60-73 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather test results for slit tear strength, hardness of the grain surface and stiffness gave no evidence that sulfated sperm oil analogs produced leather significantly different from sulfated sperm whale oil in these physical properties. Degree of sulfation of the oils and type of mordant used, however, had significant effects on physical properties. Penetration of oil into the kidney location was affected by type of fatliquor used, degree of sulfation and type of mordant used; and the amount of oil taken up by the leather was influenced by neutralization level. Note de contenu : - EXPERIMENTAL : Fatliquoring - Drying and conditioning - Physical testing - Chemical testing - Histological evaluations - Statistical evaluations - RESULTS : Physical testing - Chemical testing of the eight fatliquors - Chemical testing of the leather - Histological evaluations - Correlation coefficients En ligne : https://drive.google.com/file/d/1GdsGmRMzDPWJl0w7H41BBPhlcuUo56YK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17577 [article]

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Conservation of chromium in the tanning industry / Jean J. Tancous in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXVI (Année 1981) . - p. 164-175 Titre : Conservation of chromium in the tanning industry Type de document : texte imprimé Auteurs : Jean J. Tancous, Auteur ; R. Bellingham, Auteur ; Waldo E. Kallenberger, Auteur ; A. McDonell, Auteur Année de publication : 1981 Article en page(s) : p. 164-175 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chromium can be recovered from wet-blue offal trimmings and shavings with substantial saving in chemicals by incineration at 600°C for 5 hr. Pretreating the offal with 0.5 M Na2CO3 and air-drying prior to incineration produced CrO4(2-). The ash obtained by simply incinerating the offal, without pretreatment, contained water-insoluble Cr2O3, which was purified by leaching with water. Chromium and crude protein were extracted efficiently from offal using 5 percent NaIO3, 5 percent H2SO4, and 3 percent NaCl at 40°C. This procedure was effective but expensive. Leather satisfactory as to odor, appearance, and shrinkage temperature was made with chromium recovered from wet-blue offal by incineration and by extraction. Chromium conservation is possible by recycling chromium liquors and by precipitating the chromium from spent tanning liquors before they are combined with other tannery wastes. If the wastes are combined first, other contaminants are introduced that make chromium recovery and reuse difficult. Leaching sludges with H2SO4 produced marginal chemical cost gains. Leather tanned with these solutions had satisfactory shrinkage temperature, but the sludge odors and iron contamination were objectionable. Note de contenu : - Material balance data for offal - Recovery of chromium from offal by extraction - Recovery of chromium from offal by incineration - Recovery of chromium from wastewater sludges by extraction En ligne : https://drive.google.com/file/d/1pEyRiFVYnS10c-FDaW1wehFc1MPdF7rF/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17599 [article]

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Pratical evaluation of ethylenediaminetetra-acetic acid for controlling iron stains on vegetable tanned leather / Timothy D. Stilwell in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 12 (12/2001)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 12 (12/2001) . - p. 481-490 Titre : Pratical evaluation of ethylenediaminetetra-acetic acid for controlling iron stains on vegetable tanned leather Type de document : texte imprimé Auteurs : Timothy D. Stilwell, Auteur ; Mark W. Armstrong, Auteur ; Jean J. Tancous, Auteur ; L. Shepley Hermann, Auteur ; W. Buehrig, Auteur Année de publication : 2001 Article en page(s) : p. 481-490 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Tanners of vegetable tanned leather have observed that when iron contacts moist or wet leather it causes gray to black stains. For years, the chelating agent, ethylenediaminetetraacetic acid (EDTA), has been added to dry tannin extracts and to tanning liquors to prevent iron stains. This study was conducted to find out how much iron is present in tannins and in tan liquors and to find out how much iron, in the absence of EDTA, would be needed to cause iron stains. Analytical analyses and color determinations, using sheepskin skivers and colorimetry, showed that EDTA, an expensive chemical, did not need to be added during tanning and retanning of vegetable tanned leather. En ligne : https://drive.google.com/file/d/1Zchpl1gke9tqq6d_aIsFmVsiVU6Zxp7U/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4347 [article]

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Purification of collagenous tissue of the epidermal area during beamhouse processing / Jean J. Tancous in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIV, N° 1 (01/1999)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIV, N° 1 (01/1999) . - p. 20-32 Titre : Purification of collagenous tissue of the epidermal area during beamhouse processing Type de document : texte imprimé Auteurs : Jean J. Tancous, Auteur ; Robert J. Harvey, Auteur ; Bruce W. Buehrig, Auteur Année de publication : 1999 Article en page(s) : p. 20-32 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Purification of collagenous tissue of the epidermal area during beamhouse processing has been studied by using a fractionation technique. The epidermal area to the base of the hair pockets was isolated and separated into a residue fraction, a coagulable protein fraction , and a gelatin fraction. The gelatin fraction represented collagenous tissue. Collagenous tissue of the epidermal area of bated stock supplied by thirteen different tanneries varied from 78.6 to 91.3%. Collagenous tissue of the epidermal area of unbated, delimed stock, processed at a tannery, was 83.7%, it was purified by bating, in the laboratory, to 88.4% with a 1-hour bate and to 91.3% with a 3-hour bate. Collagenous tissue of the epidermal area of unbated, delimed stock, processed at another tannery, was 87.9%, it was purified by bating at this tannery to 90.5%. A wash after bate did not improve purification but pickling (or acidification) gave futher purification over bating. Note de contenu : - TANNERY SAMPLES - U.S.H.S.L.A LABORATORY PROCEDURES: Preparation of two, two-inch squares samples - Preparation of epidermal-area samples - Fractionation of samples - Residue fraction - Gelatin fraction - Coagulable protein fraction - Method of processing laboratory control samples - Laboratory bating studies - RESULTS AND DISCUSSION: Comparison of two-inch squares samples with epidermal area samples - Comparison of laboratory processing and tannery processing - Laboratory bating of tannery-processed, steerhide samples - Vegetable-tanned leather processing - Chrome-tanned leather processing - Improvement of purification of epidermal area by bating over deliming - Effect of washing after bating on purification - Effect of pickling after bating on purification - Effect of lowering pH after bating on purification - Appearance of residue - Coagulable protein fraction En ligne : https://drive.google.com/file/d/1YCs6WUep2BxEhb4KzAau9IEq2U0o6vK0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4492 [article]

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Studies of beamhouse swelling for brine-cured hides given an enzyme soak / Jean J. Tancous in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXXI, N° 11 (11/1996)  

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A study of fat spew by gas chromatography / Jean J. Tancous in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXIX (Année 1974)  

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A study of various types of soaks on the rehydratation of brine cured hides used for vegetable tanned leather / Jean J. Tancous in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIX, N° 8 (08/1994)  

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