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Auteur Hiroshi Okamura |
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Ions eluted from leathers and their corrosiveness to metals / Yasumasa Chonan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVII, N° 11 (11/1992)
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Titre : Ions eluted from leathers and their corrosiveness to metals Type de document : texte imprimé Auteurs : Yasumasa Chonan, Auteur ; Hiroshi Okamura, Auteur ; Keiji Yoshimura, Auteur Année de publication : 1992 Article en page(s) : p. 409-418 Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : It is well known that metals annexed to leathers are easily corroded and various kinds of troubles come from this corrosion. However, the reasons for this corrosion have not been clarified.
The present study has been made only for chrome-plated steel pipes.
In the corrosion of steel annexed to leather, chloride ion eluted from leather is considered to be the main factor for the corrosion except in a few cases. In addition to chloride ion, eluted sulfate ion is thought to be the secondary factor although its effect on corrosion was observed although much chloride ion was eluted.
This may be explained by the fact that there is no contact between a steel pipe and eluted chloride ion due to limited water vapor permeability of a leather surface in contact with a steel pipe or there is a painted surface on a pipe.
If a different kind of metal is annexed to leather, different kinds of eluted ions may be considered to be responsible for corrosion of the metal.
En ligne : https://drive.google.com/file/d/18E_G0g4h7a0lfM_iHu4ZUIpsPJIp9pv0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8268
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXVII, N° 11 (11/1992) . - p. 409-418[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006899 - Périodique Bibliothèque principale Documentaires Disponible Observation of skins, hides and leathers with scanning electron microscope, IV. Changes in pig skins during bating process / Kohkichi Uehara in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXII (Année 1987)
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Titre : Observation of skins, hides and leathers with scanning electron microscope, IV. Changes in pig skins during bating process Type de document : texte imprimé Auteurs : Kohkichi Uehara, Auteur ; Harukazu Toyoda, Auteur ; Yasumasa Chonan, Auteur ; Hiroshi Okamura, Auteur Année de publication : 1987 Article en page(s) : p. 33-40 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The changes of the grain structure in pig skins during the bating process were observed with the scanning electron microscope. In addition, the amount of hydroxyproline released from pig skins during the bating process was determined and some physical properties of the bated skin pieces were measured.
The humps of dermal papillae in the delimed skins were slight and the surface of papillae was flat. When the delimed skin was incubated with buffer solutions at pH 7.5 for 4 hr, the papillae swelled and the shapes of the surface were spherical, depresed or wrinkled. At a magnification of below 1,000 times, a new network structure was frequently observed in the surface of papillae of the skin pieces treated with pancreatin of Bacillus subtilis (B. sub) protease. This network was composed of the bundled grain fibrils.
The grain fibrils in the delimed skin coalesced with each other and were surrounded with some amorphous substances. When treated with pancreatin, the grain fibrils were clearly exposed and separated from each other as shown by the micrographs only at high magnification.
The amount of hydroxyproline released from the skin pieces during the enzyme treatment for 4 hr was less than 1%. The values of surface elongation and strain measured with a Tensometer decreased in the pieces treated with pancreatin or sub. protease.En ligne : https://drive.google.com/file/d/1hLnma872R1W2Xo1wBrRU-eaWWik1yXVB/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8962
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXII (Année 1987) . - p. 33-40[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 008087 - Périodique Bibliothèque principale Documentaires Disponible Studies on incineration of chrome leather waste / Tetsuo Imai in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVI, N° 8 (08/1991)
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Titre : Studies on incineration of chrome leather waste Type de document : texte imprimé Auteurs : Tetsuo Imai, Auteur ; Hiroshi Okamura, Auteur Année de publication : 1991 Article en page(s) : p. 281-294 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : For incineration of chrome leather wastes by non-polluting methods, we installed an experimental dry distillation furnace consisting of primary and secondary incinerating chambers with an alkaline scrubber and a water-warming boiler. Investigation were performed on incinerating conditions to reduce the toxic gas components, and on the effect of the scrubber on removing them; the incinerated residue including chrome was roasted for chrome recovery. SO2 was removed completely by the alkaline scrubber. By step-wise raised temperature incineration NOx and dust were suppressed to acceptable levels of pollution control.
It was ascertained that the recovered ashes could be applied to the process of reparing bichromate as a raw material.En ligne : https://drive.google.com/file/d/1dpHWvR91ofg3n9HTQ7A5PY4qgAduqcnQ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8477
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXVI, N° 8 (08/1991) . - p. 281-294[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006883 - Périodique Bibliothèque principale Documentaires Disponible