Dépouillements

The effect of splitting and shaving upon some physical characteristics of side upper leather / D. Geoff Hawthorne in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 56-65 Titre : The effect of splitting and shaving upon some physical characteristics of side upper leather Type de document : texte imprimé Auteurs : D. Geoff Hawthorne, Auteur ; Ross G. Donovan, Auteur Année de publication : 1975 Article en page(s) : p. 56-65 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Propriétés physiques Fendage Opérations mécaniques Rasage Résistance à la déchirure Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The stitch-tear strength of regular side leather production was evaluated (a) hefore splitting, (h) after shaving, and (c) in the "crust" state. Mullen strength (to grain crack) was ohtained on the same leathers in the "crust" state. The results were evaluated statistically and a number of significant relationships estahlished. The correlations of primary interest are: - (a) Thickness hefore splitting vs. stitch-tear strength. - (b) Thickness after shaving vs. stitch-tear strength. - (c) Stitch-tear strength after shaving vs. stitch-tear strength in the "crust." - (d) Mullen strength (crust) vs. stitch-tear strength (crust). On the basis of these results, estimates can he made regarding the strength of regular tannery production and decisions can be made regarding the disposition of chrome-tanned stock into various types of leather. Note de contenu : - 1. Before splitting - 2. After shaving - 3. In the crust state En ligne : https://drive.google.com/file/d/16vu_ymxS9zE9NSot-7Oj6nvIkQD-aAcW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38779 [article]

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008509	-	Périodique	Archives	Documentaires	Exclu du prêt

Comparative instrumental evaluation of water-resistant upper leathers / Ludwig Seligsberger in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 66-75 Titre : Comparative instrumental evaluation of water-resistant upper leathers Type de document : texte imprimé Auteurs : Ludwig Seligsberger, Auteur ; Richard F. Lacerte, Auteur Année de publication : 1975 Article en page(s) : p. 66-75 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse Evaluation Mesure -- Instruments Résistance à l'humidité:Résistance à l'eau Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The Dow Corning Tester w•as introduced as an alternative for measuring water resistance in leather hecause the number of flexes to produce a leak was found to he approximately one quarter of the number required on the Maeser Tester. An investigation was conducted to determine how three possible ways of mounting specimens in the Dow Corning 'l'ester would affect water penetration. The results show that w•ater penetration is achieved faster with the Dow Corning Tester than with the Maeser Tester only when the specimens are mounted with their walls parallel tu each other during maximum extension. The gaskets prescrihed for use with the Dow Corning Tester are not essential and need not be used. When a four-by-four inch specimen is mounted to form a pouch with a middle fold before the machine is turned on, the specimens are compressed, slowing down the rate of water penetration to the extent that no saving in time is realized, compared to the Maeser Tester. In fact, with some of the leathers tested in this manner flexing had tu he terminated after 100,000 cycles because no leakage occurred, as is frequently ohserved on the Maeser Tester. The precision of the methods in which end points were reached with unahraded samples was hetter than expected, with the coefficients of variation ranging from 29 to 67 percent, compared with 100 percent termed "not unusual" in the description of the standard method issued by the American Society of Testing and Materials. Final tabulation shows that for the water-resistant upper leathers examined the mean ratio of the number of flexes till leakage in the Maeser Tester to the number of flexes till leakage in the Dow Corning l'ester was in the vicinity of 2.5, which is somewhat lower than previously reported. Note de contenu : - Equipment - Procedure - Table 1 : Water resistance of flesh out upper leather - Table 2 : Water resistance of abraded flesh out upper leather - Table 3 : Water resistance of flesh out upper leather - Table 4 : Water resistance of grain out upper leather - Table 5 : Ratio of results on maeser and dow corning tester En ligne : https://drive.google.com/file/d/17kLLzNdF9Pdhyl6ES0QrYuI0lErjfoYT/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38780 [article]

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008509	-	Périodique	Archives	Documentaires	Exclu du prêt

Water vapor permeability of leather and leatherlike sheet materials : a new approach / Ludwig Seligsberger in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 98-113 Titre : Water vapor permeability of leather and leatherlike sheet materials : a new approach Type de document : texte imprimé Auteurs : Ludwig Seligsberger, Auteur Année de publication : 1975 Article en page(s) : p. 98-113 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir Cuir synthétique Cuirs et peaux -- Analyse Essais (technologie) Perméabilité Vapeur d'eau Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Water vapor permeability can be determined by establishing a gradi-ent from zero to near 50 percent relative humidity using a desiccant like calcium chloride, or a gradient from almost 50 percent to 100 per¬cent relative humidity using water. New variants of water vapor trans¬mission methods were investigated. Common to these is the use of a turntable to control the airflow near the assembly with the specimen. The desiccant method was improved by making the hygroscopie surface next to the specimen renewable. In the method using water, a hydrophobic microporous barrier was placed between water and specimen, and the passage of water vapor through this barrier simulating the skin was accelerated by raising the water temperature through an external electric heating system. Experiments were conducted on several types of leather and on sheet materials used as leather substitutes. Water vapor transmission was measured in dynamic tests using the turntable and in static tests in which the assembly with the specimen was stationary. In additional static and dynamic tests the rate of evaporation of water in the presence or absence of the barrier material and the water pickup of the desiccant itself were determined. The results are summed up in five tables. It is concluded that the rates of water vapor transmission found at 21°C. by the new variant of the desiccant method and by the method using water next to a microporous barrier are not substantially different. Raising the water temperature to 39°C., on the other hand, raised transmission rates for three types of leather 3.3 to 8.6 times and for expanded or perforated vinyl 35 to 65 times. These unexpected differences point out the importance of simulating actual wear conditions in the assessment of water vapor permeability as a comfort factor. Note de contenu : - APPARATUS : For the desiccant method - For the method using water at 21°C - For the method using water at 390°c - Properties of FHLP filters - Equipment for additional tests - METHODS OF TEST AND REPORTING RESULTS : Deiccant method - Dynamic method using water at 21°C - Dynamic method using water at 39°C - "Blank" determinations - RESULTS : Desiccant method - Method using water at 21°C and 39°C - DISCUSSION : Desiccant method - Method using water - Table 1 : Water vapor permeability with calcium chloride as desiccant in absence or presence of leather and other sheet materials - Table 2 : Evaporation and transmission of water vapor in absence and presence of a hydrophobic microporous barrier - Table 3 : Water vapor permeability of leather and other sheet materials in presence of a hydrophobic microporous barrier - Table 4 : Comparative values for water vapor permeability on turntable and in test chamber - Table 5 : Ratios obtained by measuring evaporation, absorption, and water vapor transmission by different methods En ligne : https://drive.google.com/file/d/1DzSHvfxCdVUe6aUUqjmCmgz80erh4M8E/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38781 [article]

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008509	-	Périodique	Archives	Documentaires	Exclu du prêt

Scanning electron microscopy of hides, skins, and leather / John R. Barlow in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 114-128 Titre : Scanning electron microscopy of hides, skins, and leather Type de document : texte imprimé Auteurs : John R. Barlow, Auteur Année de publication : 1975 Article en page(s) : p. 114-128 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse Microscopie électronique à balayage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study outlines techniques that have been found reliable in preparing leather and wet pelt for examination by scanning electron microscopy (SEM). The use of camphene as an embedding material is proposed as a means of minimizing fiber distortion during sectioning. Osmic acid vapor has been found to be helpful in pre-treating very rough surfaces (e.g., suedes) for gold-palladium coating, which is necessary to minimize build-up of electric charge during examination at 7.5 kV. Some examples of the information which can be obtained by the use of scanning electron microscopy, and which is helpful in solving industrial problems, are also recorded in this paper. Note de contenu : - EXPERIMENTAL : A. Dry samples - B. Wet samples - using pickled sheepskin - C. Effect of camphene on finish binders - RESULTS : Effect of camphene - Nomenclature - Dry samples - Wet samples En ligne : https://drive.google.com/file/d/1fxxGbdKLg-xyReg5T0oO9EHVRX8Yy9r1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38782 [article]

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008509	-	Périodique	Archives	Documentaires	Exclu du prêt

Rotogravure printing on leather / Jordan Katzarov in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 149-161 Titre : Rotogravure printing on leather Type de document : texte imprimé Auteurs : Jordan Katzarov, Auteur Année de publication : 1975 Article en page(s) : p. 149-161 Langues : Américain (ame) Catégories : Cuir -- Décoration Impression sur cuir Rotogravure Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The art of finishing or decorating leather in one form or another has been practiced for countless centuries. As far back as the records go man has treated his tanned skins and hides with many kinds of materials, first to make them more durable, and later to make them more decorative and attractive. In the fashion-conscious world today different and unusual effects on leathers are very much in vogue and in demand, and these effects have been created and carried out in the tanneries in many ways. Some of the methods are laborious, costly, and slow, but nevertheless have been practiced extensively because it was necessary to satisfy the demand for leathers finished with these effects. For example, the stained goat look is made hy a wash-off process on embossed kid grain, while the inlay effect is accomplished either by the wash-off or flow-in techniques on embossed grains such as the Crusho Kid print. Antique appearances have been created hy ecrase spraying wrinkled or crunched leathers. The "blotchy aniline" effect is produced hy a special spraying set-up. There is the antique "worn" look ‘vhich is produced by dry-milling, and the brush-off appearance which is made in the shoe f actory. There are many other techniques with innumerable variations used to embellish leathers, but it is beyond the scope of this paper to deal with such procedures in detail. Rather, we are con¬cerned with the "fashion finishing" of leathers hy rapid tannery production methods, yielding uniform reproducible results. En ligne : https://drive.google.com/file/d/1xUzCNkhUA78Q4QlFh21aJaO7yrT0WlPK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38783 [article]

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008509	-	Périodique	Archives	Documentaires	Exclu du prêt

The mechanics of spray finishing leather / Richard J. Quinn in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 162-168 Titre : The mechanics of spray finishing leather Type de document : texte imprimé Auteurs : Richard J. Quinn, Auteur Année de publication : 1975 Article en page(s) : p. 162-168 Langues : Américain (ame) Catégories : Cuirs et peaux -- Appareils et matériels Cuirs et peaux -- Finition Dépôt par pulvérisation Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : It may be of interest to you to know that the first mechanically operated spray finishing machine used for finishing leather was invented 46 years ago, in the year 1927. This new machine was designed and developed by A. C. Lawrence Leather Co., in Peabody, Mass. It was described in the patent, which was later issued in July, 1934, as "An Apparatus for Applying Coating Material to Leather or Hides for the Manufacture of Patent Leather." It was the intent of the inventor to use this device to improve the method of applying the varnish finish coats on patent leather. At the time this material was being applied by hand brushing or swabbing, a method which was slow and expensive. The original machine was semiautomatic in operation and was arranged so that the spray gun carriage could travel continuously up and down in a vertical transverse motion. The leather to he sprayed was supported by rope toggles in a wooden frame which was suspended from an overhead monorail conveyor track. The frame was advanced horizontally by a motorized conveyor chain with an intermittent indexing movement and it remained stationary for each stroke of the spray gun carriage. En ligne : https://drive.google.com/file/d/1ByRzmF-hDafSnj5PyT5Gx7IX2C3s39G_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38784 [article]

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008509	-	Périodique	Archives	Documentaires	Exclu du prêt

Urethane polymers in leather finishing / John J. McCarthy in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) Titre : Urethane polymers in leather finishing Type de document : texte imprimé Auteurs : John J. McCarthy, Auteur Année de publication : 1975 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Finition Polyuréthanes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : As a class of polymers, the polyurethanes are unsurpassed in their versatility, in that products are available covering a wide range of processing and property variations. They are produced today in considerably different physical states and possessing substantially dissimilar physical properties. They can be divided into three broad classes consisting of foams, coating systems, and millable systems. The millable types can be further divided into groups as cross-linkable rubbers, and thermoplastic and thermosetting polymers. For adhesive and coating formulating, the thermoplastic types are most useful ; and it bas been our experience that the polyester urethanes give better adhesion than the polyether types. These polymers are compatible with a wide range of resins, making it possible to increase adhesion, abrasion, and plating or embossing properties. Note de contenu : - Urethane chemistry - Raw materials - Two-component systems - Elastomers - Advantages of elastomers in leather finishing - Urethane aqueous emulsions - Need for urethanes in leather finishing En ligne : https://drive.google.com/file/d/1Xah58GI5m4VDixPy4VE7JpxlXjAwD-tH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38785 [article]

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008509	-	Périodique	Archives	Documentaires	Exclu du prêt

A study of freeze branding : influence of branding conditions on legibility and leather damage / A. L. Everett in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 188-205 Titre : A study of freeze branding : influence of branding conditions on legibility and leather damage Type de document : texte imprimé Auteurs : A. L. Everett, Auteur ; N. W. Hooven, Auteur ; J. Naghski, Auteur ; Robert G. Koeppen, Auteur Année de publication : 1975 Article en page(s) : p. 188-205 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Animaux -- Marquage Azote Cuirs et peaux -- Détérioration Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Traditional hot-iron branding of cattle produces large economic losses of leather, marginal legibility for ranchers, and excessive cruelty to animals. Substitution of irons chilled in a dry ice-alcohol mixture or liquid nitrogen produces permanent, white-haired brands that are relatively painless and show greatly improved legibility. Furthermore, when properly performed, freeze branding induces minimal scarring of hide tissue and therehy reduces the leather wastage produced hy conventional branding. To provide further guidelines for improving the technique of freeze branding, a comprehensive, three-year test was performed on 23 dairy cattle and nine beef animals at three geographic locations. The two refrigerants mentioned above were compared in parallel on opposite sides of each animal to evaluate three other primary variables : age at branding, anatomical area, and exposure time. Legibility of each brand was scored after regrowth of hair. Cuttability (usability) of resultant leathers was judged mostly in corrected grain finish, but partially in full grain and in splits after close inspection of crusted sides. It was shown that exposure time, age at branding, and breed type are all critical variables. Although both refrigerants gave equally good legibility, liquid nitrogen (as used after clipping) produced many more bald brands and too much tissue damage for acceptability in leather. Cuttability of the dry-ice hrands ranged from about 25 percent in grain leather to over 50 percent in splits. Note de contenu : - EXPERIMENTAL : Test design - Test cattle - Branding procedures - Legibility scores - Leather scores - Acceptable brands - RESULTS AND DISCUSSION : Brand legibility - Bald brands - Leather effects - Minor factors - Optimum branding conditions - Table 1 : Controlled variables in freeze brand test - Table 2 : Test cattle used at each location - Table 3 : Influence of time and refrigerant on baldness and legibility of freeze brands on 22 dairy cattle En ligne : https://drive.google.com/file/d/1sbMCEUuTMHwhV0n-340pPke6ChSD05K0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38786 [article]

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008509	-	Périodique	Archives	Documentaires	Exclu du prêt

Preservation of hides with sulfite. I. Concentration and application effects on small-scale experiments with cattlehides / William J. Hopkins in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 248-2260 Titre : Preservation of hides with sulfite. I. Concentration and application effects on small-scale experiments with cattlehides Type de document : texte imprimé Auteurs : William J. Hopkins, Auteur ; David G. Bailey, Auteur Année de publication : 1975 Article en page(s) : p. 248-2260 Langues : Américain (ame) Catégories : Acétique, Acide L'acide acétique (du latin acetum) ou acide éthanoïque est un acide carboxylique de formule chimique : C2H4O2 ou CH3COOH. L'acide acétique pur est aussi connu sous le nom d'acide acétique glacial. C'est un des plus simples des acides carboxyliques. Son acidité vient de sa capacité à perdre le proton de sa fonction carboxylique, le transformant ainsi en ion acétate CH3COO-. C'est un acide faible. L'acide acétique pur est un liquide très faiblement conducteur, incolore, inflammable et hygroscopique. Il est naturellement présent dans le vinaigre, il lui donne son goût acide et son odeur piquante (détectable à partir de 1 ppm21). C'est un antiseptique et un désinfectant. L'acide acétique est corrosif et ses vapeurs sont irritantes pour le nez et les yeux. Il doit être manipulé avec soin. Quoi qu'il n'ait pas été jugé cancérigène ou dangereux pour l'environnement, il peut causer des brûlures ainsi que des dommages permanents à la bouche, au nez, à la gorge et aux poumons. À certaines doses et en co-exposition chronique avec un produit cancérigène, son caractère irritant en fait un promoteur tumoral de tumeurs (bénignes et malignes)21. Ceci a été démontré expérimentalement chez le rat. Bactéries -- Comptage Cuirs et peaux -- Analyse Cuirs et peaux -- Conservation Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de bovins Essais dynamiques Résistance à la traction Sulfate de sodium Le sulfate de sodium est un composé chimique courant formé d'un ion sulfate et de deux ions sodium. Lorsqu'il est anhydre, il prend l'apparence d'un solide cristallin blanc de formule chimique Na2SO4. La forme déca-hydratée, Na2SO4·10H2O, est connue sous le nom de sel de Glauber ou mirabilite. Parmi un grand nombre d'usages différents, les principales utilisations du sulfate de sodium concernent la fabrication des détergents et dans le procédé de Kraft de traitement de la pâte à papier. La moitié environ de la production mondiale provient de l'extraction de la forme naturelle décahydratée, et l'autre moitié de productions secondaires dans des procédés de l'industrie chimique. sulfite de sodium Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study examines the effects on the length of hide preservation of (a) sulfite concentration, (b) sodium bisulfate and acetic acid as acidulants, (c) sodium bisulfite alone, and (d) various methods of handling and storing the treated hide samples. Small-scale studies indi-cated that short-term (six days) preservation could be accomplished at concentrations of 0.25 percent sodium sulfite and that 0.5 percent sulfite in combination with one percent acetic acid resulted in long-term (30 days) preservation. The need to containerize the treated side was demonstrated. Sides that were preserved with sulfite, drained, and stored in closed containers for six days at ambient temperatures were made into acceptable leather. An estimated cost of materials for the sulfite preservation compared favorahly with the material costs for brine curing. Note de contenu : - Initial experiments - Effect of treatment on leather quality - matched side experiment - Treatment costs - Table 1 : The effects of sulfite concentration and various sulfite treatments on hide preservation as jusged by bacterial count and sample odor - Table 2 : The effect of various storage methods on treated hide pieces as judged by bacterial count - Table 3 : The effect of various storage methods on treated hide pieces as judged by bacterial counts - Table 4 : The effect of sulfite concentration and float on preservation of hide pieces as judged by baterial counts - Table 5 : The effect of sulfite concentration and float on preservation of hide pieces as judges by bacterial counts - Table 6 : Bacterial counts on matched sides comparing brined sides and acid sulfite treated sides after six days of storage - Table 7 : A matched side comparison of the tensile strengths of leather prepared from brine cured and acid sulfite treated hides - Table 8 : A comparison of the costs of material for salt and sulfite treatments on 100 LBS. fresh hide En ligne : https://drive.google.com/file/d/1BYflZaYySpT9U1YXujNCKkYIxeOMNKQ1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38787 [article]

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008509	-	Périodique	Archives	Documentaires	Exclu du prêt

Glutaraldehyde retannage of chrome leather. Effect of ambient storage on selected properties of the leather / Edward H. Harris in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 269-272 Titre : Glutaraldehyde retannage of chrome leather. Effect of ambient storage on selected properties of the leather Type de document : texte imprimé Auteurs : Edward H. Harris, Auteur ; E. M. Filachione, Auteur Année de publication : 1975 Article en page(s) : p. 269-272 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir cabretta Cuirs et peaux de moutons Glutaraldéhyde Résistance à la transpiration Retannage Tannage au chrome Tannage synthétique Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Our previous studies amply demonstrated the valuable properties that glutaraldehyde imparted to leather, especially when used in combination with chrome in the tanning of hides and skins. One of the properties imparted to leather by glutaraldehyde was a markedly improved resistance to perspiration. This was true whether glutaraldehyde was used as the only tanning agent or in combination with chrome or other conventional tanning agents. We found that glutaraldehyde was used to its hest advantage following chrome tanning of leather, since many tanners sort in the blue. However, our previous publications have also shown that applying the glutaraldehyde before, or even simultaneously with, the chrome was at least equally effective. In one of our earlier studies we investigated the effect of elevated temperatures on glutaraldehyde retannage of chrome-tanned sides. In that study the temperature was initially 63°C. and ended at 47°C. As expected, the effect of elevated temperature was to increase the rate of uptake of glutaraldehyde by the chrome-tanned side leather. We now report the results obtained using chrome-tanned cabretta skins in a thermostatted Meissner mill. Because many post-tanning processes, such as retannage, coloring, and fat liquoring, are carried out at about 50°C., we chose this temperature for our studies on retannage of chrome leather with glutaraldehyde. The objective of this study was to determine the quantity of glutaraldehyde and the time of retannage required to attain perspiration-resistance in the chrome leather. Note de contenu : - Substrates - Tannage - Shrink temperatures - Perspiration resistance - Table 1 : Effect of storage time on selected properties of glutaraldehyde retanned chrome skins En ligne : https://drive.google.com/file/d/10dgZ8zuYKVbKwT8R-oAoUgE3yAQ4j0OW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38788 [article]

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008509	-	Périodique	Archives	Documentaires	Exclu du prêt

A very rapid liming and tanning process / E. Heidemann in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 299-315 Titre : A very rapid liming and tanning process Type de document : texte imprimé Auteurs : E. Heidemann, Auteur Année de publication : 1975 Article en page(s) : p. 299-315 Langues : Américain (ame) Catégories : Chaulage Cuirs et peaux Echarnage Fendage Peaux brutes -- Trempe Tannage Tannage au chrome Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In spite of the considerable progress made in the technical development of leather manufacture, there are still many problems as far as liming and tanning are concerned. Labor is hard and dirty for the worker. Therefore, tanners are working in one drum or mixer, from soaking to chrome tannage, without changing the vessel. The tanner bypasses mechanical treatment, such as fleshing, splitting, and cleaning the grain side, although even today these processes are of great importance and should be placed after liming, where they are there better situated than in soaking or after chrome tannage. However, the beamhouse processes create the most problems with respect to the effluent. This contains large amounts of proteins, sulfide, and lime, and the volume is still very large today. I would like to present to you a process which has been published in an initial form in JALCA in the December, 1973, issue. In the meantime, some improvements have been made. The process can be divided into three parts. The first part is a painting step from the hair side, performed in the manner of a conveyer belt process, and lasting 1/2 hour. The second part is a treatment with ten percent sodium peroxide solution to open up the hide structure. It takes one hour. This treatment is stopped by neutralization with acid. The third part covers the following processes : fleshing, splitting, pickling, and chrome tanning. En ligne : https://drive.google.com/file/d/1vYssc2b77hMKEgph5tzX5Hd1Vb0hMiA2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38789 [article]

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008509	-	Périodique	Archives	Documentaires	Exclu du prêt

Preservation of hides with sulfite. II. A matched side comparison of leathers from hides preserved with sodium sulfite or brine curing / David G. Bailey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 372-379 Titre : Preservation of hides with sulfite. II. A matched side comparison of leathers from hides preserved with sodium sulfite or brine curing Type de document : texte imprimé Auteurs : David G. Bailey, Auteur ; William J. Hopkins, Auteur Année de publication : 1975 Article en page(s) : p. 372-379 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bactéries -- Comptage Bain de saumure 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. Cuir d'ameublement Cuirs et peaux -- Conservation Cuirs et peaux de bovins Essais dynamiques sulfite de sodium Tige de la chaussure Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A matched side experiment was carried out to corroborate small scale studies on the effectiveness of an acidified sulfite solution" as a short-term preservation system for fresh hides. One side of each hide was conventionally sait cured and the other was treated with a 20 percent float containing 1.5 percent sodium sulfite and one percent acetic acid (on hide weight). Using six matched sides for each storage period, the sides were held six, 14, and 28 days at ambient temperatures. The leathers prepared from the preserved hides were tested for tensile strength, suitabilitv for lasting, and shrinkage temperature. The preservation was also monitored hy using microbial counts and noting the odor of the bides. The leathers made from sides held for all three storage periods were considered commercially acceptable. The results demonstrated that acidified sulfite provides an alternative to salt curing for the short-term preservation of hides. The new method reduces the dissolved solids in tannery effluents, an identified pollution problern caused hy the use of salt cured hides. In addition, the reduction of the microbial load in the preserved bides provides more sanitary conditions for hide handling. Note de contenu : - Table 1 : Microbial counts on preserved cowsides - Table 2 : Physical test data on garment light shoe upper leather (from sides preserved for 6 days) - Table 3 : Physical test data on upholstery leather in the crust (from sides preserved for 14 days) - Table 4 : Physical test data on finished garment light shoe upper leather (from sides preserved for 28 days) - Table 5 : Shrink temperatures of crust leathers (°C) En ligne : https://drive.google.com/file/d/181glFLUG0sckHdP3A7ygugRLm-fMB1k9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38790 [article]

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008509	-	Périodique	Archives	Documentaires	Exclu du prêt

Studies on the influence of certain hide constituents on growth and chromogenesis of sarcina sp. / K. Padmini in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 397-402 Titre : Studies on the influence of certain hide constituents on growth and chromogenesis of sarcina sp. Type de document : texte imprimé Auteurs : K. Padmini, Auteur ; R. Bhaskaran, Auteur ; V. S. Krishnamurthi, Auteur Année de publication : 1975 Article en page(s) : p. 397-402 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bactéries -- Croissance Bactéries à gram positif Chromogenèse Cuirs et peaux -- Dégraissage Cuirs et peaux de bovins Pigments bactériens Sarcina litoralis Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Hide extract containing salt-soluble interfibrillary substances was found to influence the growth and pigment production of a halophilic strain of Sarcina litoralis isolated from wet-salted goat skins. At 20 percent sodium chloride concentration, growth was inhibited in the basal medium but the addition of bide extract enhanced growth and pigmentation. The removal of fat from the hide extract affected growth and pigmentation significantly. Note de contenu : - EXPERIMENTAL : Preparation of extract and fat-free extract of cow and buffalo hides - RESULTS : Effect of hide extract on the growth and pigmentation of S. litoralis - Effect of fat-free hide extract on growth and pigmentation of S. litoralis - Table 1 : Pigment per standard turbidity - Fig. 1 : Effect of hide extract on the growth and pigmentation of S. litoralis En ligne : https://drive.google.com/file/d/1Hrqtrv7ydwEnDaZFl21mUJQNi3qjRnCU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38791 [article]

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008509	-	Périodique	Archives	Documentaires	Exclu du prêt

A matched-side comparative study of the unsplit blue stock and crust leather made from uncured and pit-cured hides / Stephen H. Feairheller in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 464-480 Titre : A matched-side comparative study of the unsplit blue stock and crust leather made from uncured and pit-cured hides Type de document : texte imprimé Auteurs : Stephen H. Feairheller, Auteur ; A. L. Everett, Auteur ; J. Naghski, Auteur ; F. J. Poats, Auteur ; D. F. Holloway, Auteur Année de publication : 1975 Article en page(s) : p. 464-480 Note générale : Bibliogr. Langues : Américain (ame) Catégories : 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 de bovins Echantillonnage Essais dynamiques Etudes comparatives Microscopie Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A matched-side study of 300 heavy steerhides was conducted jointly by Spencer Foods, Inc. and two agencies of the USDA to reexamine the economics of processing fresh, uncured hides into side upper leather in the light of efforts being made to eliminate salt from tannery and packing house effluents. In this report we present a comparison of the chemical and physical properties of leather made from uncured vs. cured sides at the wrung, unsplit blue stage and again at the dry crust stage, designed to indicate any potential quality advantage of one type of product over the other. A further effort was made to determine whether any other commercially important differences occurred, in response to processing, between the two types of stock. Analysis of the blue stock revealed that the uncured sides had a significantly higher chrome and ash content and a higher shrinkage temperature, while microscopic examination showed no difference in chrome distribution or extent of opening up of the fibers. Physical tests showed a higher tensile strength and penetrometer strength for the uncured sides but a lower ball burst extension value. The crust leather from uncured sides was equivalent to that from cured sides in sorting characteristics but had a significantly higher tensile strength. Processing differences were noted at the liming and chrome-tanning steps that appear advantageous to the processing of fresh hides. Furthermore, there was a slightly higher yield of crust leather from the uncured sides. it was concluded that it is possible, and perhaps economically advantageous, to process uncured hides by conventional processes into quality leather that is essentially indistinguishable from leather made from cured hides. Note de contenu : - Processing - Blue sort - Sampling - Chemical analysis - Microscopical evaluations - Physical tests - Crust sort - Table 1 : Pack and averge side weights at different stages of processing - Table 2 : Blue sort results - Table 3 : Chemical analyses and shrinkage temperature measurements - Table 4 : Results of physical tests on wrung unsplit blue stock - Table 5 : Results of physical tests on 5 1/2 oz. crust stock En ligne : https://drive.google.com/file/d/1IUHYNcE1Jh9veK6vuRuzeA7agnLkmK0X/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38792 [article]

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008509	-	Périodique	Archives	Documentaires	Exclu du prêt

Acrylic syntans - versatile tanning materials / William C. Prentiss in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 481-497 Titre : Acrylic syntans - versatile tanning materials Type de document : texte imprimé Auteurs : William C. Prentiss, Auteur ; Charles R. Sigafoos, Auteur Année de publication : 1975 Article en page(s) : p. 481-497 Note générale : Appendix - Bibliogr. Langues : Américain (ame) Catégories : Chaussures Cuirs et peaux de porcs pH Polyacryliques Prétannage Quebracho Le quebracho est un arbre à écorce ligneuse, mesurant 30 mètres de haut, à feuilles tannées et à fleurs tubulées blanches. Quebracho est l'un des noms communs, en espagnol, d'au moins trois espèces similaires d'arbres originaires du Gran Chaco, en Amérique latine : Schinopsis lorentzii (quebracho colorado santiagueño), de la famille des Anacardiaceae ; Schinopsis balansae (quebracho colorado chaqueño), de la même famille ; Aspidosperma quebracho-blanco (quebracho blanc), de la famille des Apocynaceae. Ces trois espèces sont riches en tanin et fournissent un bois très dur, particulièrement résistant. Leur nom provient de l'espagnol quiebrahacha, qui signifie brise-hache. Retannage Syntans Tannage au chrome Tannage combiné Le tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en Å“uvre par exemple Chrome-Végétal ou Chrome-Synthétique Tannage synthétique Tannage végétal Tige de la chaussure Vêtements Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Acrylic resins have been utilized for decades in the finishing of leather, and literature references are available for their use in finishing and in retanning processes. There is little in the current literature, however, on acrylic syntans for use in tanning or retanning, although such products have been available commercially since the early 1960's. In 1966, a Netherlands patent and, in 1969, a United States patent were issued covering the basic composition and use of an acrylic polymer prepared in the presence of a sulfated oll for use in the preparation of leather. A paper read at the Northampton group of the SLTC covered the known properties of one of these novel retanning materials. More recently, a patent was issued to cover copolymers of unsaturated acids and quaternized tertiary amines, although products of this type are not normally available. Note de contenu : - USE OF ACRYLIC SYNTAN WITH CHROME TANNING : As a chrome exhaust aid - As a pretannage - USE OF ACRYLIC SYNTAN IN RETANNING OF CHROME LEATHER : Review of precious work - Effect of pH to control deposition - Buffered retannages - Combination retannages with vegetable extract - CURRENT RETANNAGES FOR VARIOUS LEATHERS - Table 1 : Acrylic syntan - typical values - Table 2 : Syntan influence on chrome exhaustion - Table 3 : Acrylic syntan compared as pretan or retan - Table 4 : Acrylic syntan pretan in salt-free pickle chrome content of leathers - Table 5 : Effect of pH of retannage on leather properties - Table 6-A : Effect of buffers on leather properties - Table 6-B : Effect of buffers on leather properties - Table 7 : Acrylic syntan in combination with vegetable - Table 8 : Buffered acrylic plus quebracho retannage - Table 9 : Buffered retannage for white, full grain side leather - Table 10 : Soft pigskin for garment leather - Table 11 : Retannage for white pigskin - Table 12 : Retannage for shoe side upper leather - Table 13 : Retannage for softy shoe or boot En ligne : https://drive.google.com/file/d/1tJOg67zIbIoqEV2WZUuL8IAHhtGEvESE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38793 [article]

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008509	-	Périodique	Archives	Documentaires	Exclu du prêt

Fluorescence polarization of dye-labeled collagen : local flexibility in the nonhelical region / D. Quimby in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 510-518 Titre : Fluorescence polarization of dye-labeled collagen : local flexibility in the nonhelical region Type de document : texte imprimé Auteurs : D. Quimby, Auteur ; Lee P. Witnauer, Auteur Année de publication : 1975 Article en page(s) : p. 510-518 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène -- Analyse Colorants Fluorescence Matériaux -- Coloration Mesure Polarisation (lumière) Pronase Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The fluorescent dye derivatives fluorescein isothiocyanate (FI) and 5-dimethylamino-1-naphthalene sulfonyl chloride (DNS) have been covalently bound to collagen. Fluorescence from the FI conjugate is depolarized primarily hy rotation of the dye molecule about the covalent bond joining it to the protein. DNS on the other hand binds tightly to the helical regions of collagen and fluorescence from the DNS conjugate is depolarized hy rotatory diffusional motion in the nonhelical regions of the protein. Variation in pH between 3 and 10.5 has little effect on the degree of fluorescence polarization of the DNS conjugate, indicating that the degree of flexibility in the nonhelical regions remains unchanged in this pH range. Ca2+ ion induces local flexibility in the helical regions of collagen, and removal of the nonhelical regions by pronase treatment seems to render the helical regions more susceptible to perturbation by Ca2+ ions. Note de contenu : - Materials - Dye coupling - Pronase treatement - Equipment and measurements En ligne : https://drive.google.com/file/d/1cQMpUdRnNhm7Rah6-R0GtJ1Ly4TohNlV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38794 [article]

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008509	-	Périodique	Archives	Documentaires	Exclu du prêt