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Water vapour absorption by full chrome leather / R. G. Mitton in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 54, N° 7 (07/1970)
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Titre : Water vapour absorption by full chrome leather Type de document : texte imprimé Auteurs : R. G. Mitton, Auteur Année de publication : 1970 Article en page(s) : p. 248-266 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption
Cuir
Humidité -- Absorption
HystérésisL'hystérésis (ou hystérèse) et signifiant "après" ou "plus tard", est la propriété d'un système qui tend à demeurer dans un certain état quand la cause extérieure qui a produit le changement d'état a cessé.
Vapeur d'eauIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Absorption and desorption isotherms for water vapour in full chrome leather at 5, 20 and 35°c are given. They agree satisfactorily with those previously found by the author and by Kanagy, but uptakes are higher than obtained by most other investigators, probably because they allowed insufficient time for complete equilibrium. The moisture content at 65% r.h. is far higher than usually assumed in leather analysis. At high humidities, regains exceed 70 %.
Although the outline of the hysteresis cycle was measured by slow approach to equilibrium (years), this period was only necessary because of slow diffusion of moisture through air; the equilibrium values obtained by rapid equilibration in a vacuum are little different. At humidities up to about 60%, the shape of the ascending humidity isotherm is different if the specimens are heated to 100°c beforehand. The descending branch is little changed.
The usual hysteresis cycle defines an area which is crossed by isotherms descending from points on the rising boundary curve, or ascending from points on the descending boundary curve. A number of these isotherms are shown.
Data are given for absorption and desorption at 20°c, 65 % r.h. of leathers with different chrome contents. The width of the hysteresis cycle under these conditions increases with chrome content, probably because crosslinking by chromium reduces swelling during absorption, and reduces shrinking during desorption.Note de contenu : - Leathers used for the experiments
- Measurements of dry weights
- Method of conditioning
- Times to reach equilibrium
- The hysteresis loop
- The hysteresis loop for chrome leather dried without heating
- The hysteresis loop for chrome leather dired at 105°C
- States within the boundary hysterisis loop
- Absorption and desorption at other temperatures
- Application of the brunauer, Emmett and Teller equation
- TABLE 1 : Values estimated from the B.E.T. equation for ascending and descending isothermsEn ligne : https://drive.google.com/file/d/1jvvQhHqMDmm-ON4XBuVrqOcWHHNNKhLO/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37017
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 54, N° 7 (07/1970) . - p. 248-266[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007084 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Water within the skin structure Type de document : texte imprimé Auteurs : Richard Daniels, Auteur ; Walter Landmann, Auteur Année de publication : 2005 Article en page(s) : p. 30 Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse
Cuirs et peaux -- Teneur en eauIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Water plays a major role within the living skin, in making leather, and the manufacture and behaviour of the final product. Nevertheless, the way that water is held within the structure, and the changes that take place in chemical processing, drying and ageing are not understood in fine detail. Note de contenu : - Water in the living skin
- The effects of removing water
- Replacing water as a lubricant
- The role of water within physical changeEn ligne : https://drive.google.com/file/d/1Af8eIItOYRBLyILtIoJX3VsxQyq57_dC/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32462
in WORLD LEATHER > Vol. 18, N° 3 (05/2005) . - p. 30[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006183 - Périodique Bibliothèque principale Documentaires Disponible Waterborne coatings based on different film forming polymers / Dietrich Lach in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIII (Année 1988)
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Titre : Waterborne coatings based on different film forming polymers Type de document : texte imprimé Auteurs : Dietrich Lach, Auteur ; Karl Fischer, Auteur ; Ivo Knoll, Auteur Année de publication : 1988 Article en page(s) : p. 87-94 Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : For about 20 years, the problems of environmental protection have been intensively discussed at the congresses of the leather industry in all parts of the world. In the seventies, the effluent problems were of topical interest. In the heighties, the discussions have concentrated more and more on subjects concerning air pollution. The problems of environmental protection have thus shifted from the beamhouse to the finishing department. Requirements of the government agencies are,to a great extent, already in existence. Enforcement of these regulations will make the use of lacquers based on oganic solvent difficult in the future. This means that the traditional finishing system has to be changed completely. Waterborne coatings have therefore to be used for finishing and top coating leather. However, the question is whether this will be possible without impairing the physical properties and the appearance of the finished leather.
Before we discuss this question, let us first take a look at the improvements we can achieve with existing technology. Let us consider a tannery finishing 2000 sides a day using two top coats based on nitrocellulose. These top coats can be applied to the leather in four different ways. They can be sprayed or printed as a nitrocellulose lacquer or they can be sprayed or printed as a lacquer emulsion. Table I shows the approximated amounts of solvents emitted.En ligne : https://drive.google.com/file/d/1WXdsQbn9fi4T8LAzh9MlsKftJEp-5T5D/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8846
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXIII (Année 1988) . - p. 87-94[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 008088 - Périodique Bibliothèque principale Documentaires Disponible Waterborne polyurethane/O-MMT nanocomposites for flame retardant leather finishing / Zhang Xiuli in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 2 (03-04/2010)
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Titre : Waterborne polyurethane/O-MMT nanocomposites for flame retardant leather finishing Type de document : texte imprimé Auteurs : Zhang Xiuli, Auteur ; Chen Yi, Auteur ; Haojun Fan, Auteur ; Bi Shi, Auteur Année de publication : 2010 Article en page(s) : p. 77-83 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Cetyltrimethylammonium bromide (CTAB) and 3-aminopropyltriethoxy-silane (APTES) were used as modifiers to prepare a reactive and organophilic montmorillonite (O-MMT), then from this waterborne polyurethane (WPU/O-MMT nanocomposite dispersions for leather flame retardant finishing were prepared through in-situ intercalation polymerization. Qualitative evidence of the presence of chemically-attached APTES on O-MMT is confirmed by FT-IR and an exfoliated structure of O-MMT in WPU matrix is confirmed by X-ray diffraction (XRD). The SEM analysis reveals that the O-MMT platelets are homogeneously dispersed throughout the polymer matrix when the O-MMT content is lower than 4wt%, whereas over 4wt%, inhomogeneous dispersion of the O-MMT platelets is observed. Performance study indicates that the incorporation of O-MMT,on one hand, is capable of enhancing the thermal stability and mechanical properties of WPU efficiently ; on the other hand, enhancing the flame retardancy of finished leathers. From the analysis of vertical flame and oxygen index (OI) test,the nanocomposite with 4wt% O-MMT loading shows the optimum flame retardant effect, the OI value increases by 3.6 units. En ligne : https://drive.google.com/file/d/1x0drpUMfrC-nn_fURNs-hjm2CrVZqRPh/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9184
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 94, N° 2 (03-04/2010) . - p. 77-83[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012127 - Périodique Bibliothèque principale Documentaires Disponible Waterproof leather for high performance footwear / C. D. Hey in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 67 (Année 1983)
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Titre : Waterproof leather for high performance footwear Type de document : texte imprimé Auteurs : C. D. Hey, Auteur Année de publication : 1983 Article en page(s) : p. 136-139 Langues : Anglais (eng) Catégories : Chaussures
Cuir
Cuirs et peaux -- Finition
Essais (technologie)
ImperméabilisationIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Discussion today centres around consumer benefit at the retail level. Waterproof leather and waterproof shoes are one particular topic in this category and in this paper, background work from K. Shoemakers-one of the shoe, manufacturers at the forefront of this area- is reviewed. Note de contenu : - Shoe performance
- Leather performance
- Testing methods
- Finished leathers
- Shoe room systems
- Current trendsEn ligne : https://drive.google.com/file/d/1WGd8KH2hEnPusYvotWPETsD7dgHW1LXg/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34191
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 67 (Année 1983) . - p. 136-139[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007130 - Périodique Bibliothèque principale Documentaires Disponible Waterproof leather technologies and processes / James J. Hodder in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXX, N° 3 (03/1995)
PermalinkWaterproofing of leather : State of the art and new concepts / M. Kleban in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 12 (12/2002)
PermalinkWaterproofing of sole leather / P. L. Muthiah in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 54, N° 5 (05/1970)
PermalinkPermalinkA way to reduce injury to skin in enzymatic unhairing / Jian Song in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 3 (05-06/2015)
PermalinkWealth from tannery waste ? / Graham Lampard in LEATHER INTERNATIONAL, Vol. 214, N° 4826 (11-12/2012)
PermalinkWet blue enzymes - new treatment for area gain / Lars Rasmussen in WORLD LEATHER, Vol. 15, N° 1 (02-03/2002)
PermalinkWet-blue leather microflora and its growth / K. J. Bienkiewicz in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 66 (Année 1982)
PermalinkWet process technology I. determination of precision for various analytical procedures / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXI (Année 1986)
PermalinkWet process technology II. the effect of process variations on hides and effluents + / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXI (Année 1986)
PermalinkWet process technology III. development of a standard process / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXI (Année 1986)
PermalinkWet processing upholstery enhancement through technique / R. Kraus in WORLD LEATHER, Vol. 7, N° 1 (02/1994)
PermalinkWet-white based on an amphoteric polymer / Bi Shi in LEATHER INTERNATIONAL, Vol. 215, N° 4829 (04/2013)
PermalinkWet-white leather processing : a new complex combination tannage / Luo Jianxun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 95, N° 3 (05-06/2011)
PermalinkWhat are enzymes or bates ? / Karl Flowers in INTERNATIONAL LEATHER MAKER (ILM), N° 43 (09-10/2020)
PermalinkPermalinkWhat do tanners know about soaking ? / George Stockman in LEATHER INTERNATIONAL, Vol. 213, N° 4808 (04/2011)
PermalinkWhat do we mean by 'Green washing' ? / Karl Flowers in INTERNATIONAL LEATHER MAKER (ILM), N° 49 (09-10/2021)
PermalinkWhat is an eco leather / BLC Leather Technology Centre in LEATHER INTERNATIONAL, Vol. 212, N° 4804 (10/2010)
PermalinkWhat is different in leather dyeing today / H. Wachsmann in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXII (Année 1987)
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