Dépouillements

New trends in leather dyestueffs development and classification / H. Wicki in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 133-140 Titre : New trends in leather dyestueffs development and classification Type de document : texte imprimé Auteurs : H. Wicki, Auteur Année de publication : 1976 Article en page(s) : p. 133-140 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants azoïques Cuirs et peaux -- Teinture Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A number of dyestuffs of known chemical structure have been examined with a view to ascertaining whether there is any correlation between the chemical constitution of the dyestuff and the dyeing behaviour. There are indications that some correlation could exist and, for the dyestuffs examined, the quotient of the number of azo groups and sulpho groups appears to give a reasonable measure for the affinity and behaviour of the dyestuff. En ligne : https://drive.google.com/file/d/1dww1YnzsS1mWDsY-O_z7crh37AbebAJG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20434 [article]

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Molecular sieve chromatography / David S. Robinson in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 33-36 Titre : Molecular sieve chromatography Type de document : texte imprimé Auteurs : David S. Robinson, Auteur Année de publication : 1976 Article en page(s) : p. 33-36 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie analytique Chromatographie sur gel Polymères réticulés Tamis moléculaires Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Since 1959, when cross-linked dextran gels were first prepared by Flodin and Porath, a whole new field of chromatography has become available based on differences in molecular size. The various methods and materials used for gel filtration are described and particular use is made of theoretical considerations to determine the factros which influence resolution during gel filtration. Affinity chromatography on porous media and the use of chemically modified sepharoses are briefly considered. Note de contenu : - Theoretical Considerations - Further Applications - Fig. 1 : A diagrammatic illustration of the separation of small and large molecules by gel filtration - Fig. 2 : A definition of elution parametres for gel filtration - Table 1 : The Fractionation Range of the Dextran Type Cross-linked Polymers En ligne : https://drive.google.com/file/d/1rSgqh7_yr7rO6fFt2KFb1G-lpzZnoSPP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31800 [article]

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The swelling of pelt at neutral pH as a result of the conditions of the previous pickle / M. Portavella in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 37-45 Titre : The swelling of pelt at neutral pH as a result of the conditions of the previous pickle Type de document : texte imprimé Auteurs : M. Portavella, Auteur ; M. Soldevila, Auteur Année de publication : 1976 Article en page(s) : p. 37-45 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux de moutons Gonflement (physique) Matériaux -- Epaisseur pH Picklage Le picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu. Température de retrait Volumétrie (chimie analytique) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Tanners who process pickled sheepskins which have benn stored for a long time have probaly noticed taht sometimes the pelts are liable to swell a great deal after having been returned to the pelts state (for example, after being depickled to pH 7, and thoroughly washed). The published literature covering the deterioration produced on the skin by the preserving pickle does not refer to this swelling. There are many papers which deal with the attacks of acids (without salt) on collagen, and others which treat the acid pretreatment of collagen in order to obtain gelatin. Some of them mention that this king of acidic attack has also been observed in the presence of common salt, with the consequent swelling at neutral pH. The conditions which produce this swelling have not been studied systematically as yet. In this paper, variations of both swelling at neutral pH and the shrinkage temperature of the pelts (Spanish sheepskins after a conventional beamhouse process) are investigated as a result of the conditions of the previous pickle (NaCl in the bath: 6 and 12°/Bé; H2SO4: 1.3 and 9% on pelt weight; temp.: 20 and 40°C and time 0, 1, 6, 8 and 34 days). It has been found that both the degree of swelling and the decrease of shrinkage temperature depend on the conditions of the previous pickle. Both increase when the pickle action has been more intense. Furthermore, the effects of the acidic attack produced by a strong pickle are studied specifically on: (a) variations in the percentage of swelling and shrinkage temperature at different pH values; (b) titration curves; (c) the amount of chrome taken up by the skin in a conventional tanning; and (d) physical tests of the leather obtained, measured in the Lastrometer. Accordind to the results, and relating them to the fidings of other authors, some theoretical aspects of the possible causes of this swelling are discussed. In conclusion, a simple method to assist the sheepskin tanner is presented. This method aids in establishing the degree of deterioration of the skins caused by the combined action of the beamhouse process and the preserving pickle. The method does not require specialised personnel or instrumments. Note de contenu : - Fig. 1 : Precentage of swelling at neutral pH as a function of pickle and storage conditions - Fig. 2 : Shrinkage temperature of pelts as a function of pickle and storage conditions - Fig. 3 : Precentage of swelling at different pH values - Fig. 4 : Shrinkage temperature as a function of pH. Measurements in Na2SO4 (13° Bé°) solution - Fig. 5 : Titrage curves - Table 1 : Swelling precentage and shrinkage temperature of pelts as a function of pickle and storage conditions - Table 2 : Swelling precentage as a function of pH - Table 3 : Shrinkage temperature as a function of pH - Table 4 : Titrage curves data - Table 5 : Shrinkage temperature and ash precentage oh the chrome tanned leathers - Table 6 : Thickness and physical strenght (Lastometer) En ligne : https://drive.google.com/file/d/1kVXgbu949t9Aq3hCSuO5dLUzBroZN8OU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31801 [article]

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Some thoughts on the possible mechanism of sodium sulphate conditioning for the mimosa cure process / J. H. Atkinson in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 52-54 Titre : Some thoughts on the possible mechanism of sodium sulphate conditioning for the mimosa cure process Type de document : texte imprimé Auteurs : J. H. Atkinson, Auteur ; F. Scowcroft, Auteur Année de publication : 1976 Article en page(s) : p. 52-54 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Mimosa et constituants Tannage végétal Index. décimale : 675.2 Préparation du cuir naturel. Tannage En ligne : https://drive.google.com/file/d/1AIsqmCRJKDyP_rikC6W29qxdLB3d9DA0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31802 [article]

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Locational differences in the physical properties of sole leather / P. L. Muthiah in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 63-76 Titre : Locational differences in the physical properties of sole leather Type de document : texte imprimé Auteurs : P. L. Muthiah, Auteur ; N. Ramanathan, Auteur Année de publication : 1976 Article en page(s) : p. 63-76 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés physiques Densité Eau Evaluation Humidité -- Absorption Pénétration (physique) Perméabilité Semelles Tannage au chrome Tannage végétal Vapeur d'eau Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In order to find out the locational differences of different types of sole leathers, studies were made on samples obtained from various parts of tanned hides. For this study, the most commonly used chrome and vegetable tannages were used and the leathers were tested both in the crust and in the finished state for various physical properties. Tensile strength, elongation at break, apparent density, real density, air space, water absorption, water penetration, moisture absorption, water vapour permeability, air permeability, compressibility, resiliency, abrasion resistance and flexibility were determined on samples taken from eight different locations. The effects of tanning were assessed by determining the same physical properties on acetone dehydrated limed and delimed samples obtained from various parts of the hides. Note de contenu : - EXPERIMENTAL : Vegetable tanning - Chrome tanning - EVALUATION OF PROPERTIES : Physical properties - Evaluation of results - RESULTS AND DISCUSSION : Extension at break - Apparent density, real density and air space - Water absorption and water penetration - Moisture absorption - Water vapour permeability and air permeability - Abrasion and flexibility En ligne : https://drive.google.com/file/d/1zFimkJaKgjUTRAQBxARW0y20ESbA92uy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31803 [article]

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Locational differences in the physical properties of upper leather / P. L. Muthiah in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 77-85 Titre : Locational differences in the physical properties of upper leather Type de document : texte imprimé Auteurs : P. L. Muthiah, Auteur ; N. Ramanathan, Auteur Année de publication : 1976 Article en page(s) : p. 77-85 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés physiques Evaluation Humidité -- Absorption Perméabilité Tannage au chrome Tannage végétal Vapeur d'eau Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Systematic work has been done on the locational differences in the physical properties of upper leathers produced by vegetable and chrome tanning. This study was made on samples obtained from eight different locations, viz. neck, shoulder, front shank, belly, butt, official butt, back shank and tailend of tanned hides. The important properties of upper leather, viz. tensile strength, elongation at break, percentage set, stitch tear strength and tongue tear strength, moisture absorption, and water vapour permeability were studied and the results are presented in this paper. The effects of tanning were assessed by determining the same physical properties on acetone dehydrated hides. The significance of results is assessed using standard statistical methods. Note de contenu : - EXPERIMENTAL : Tanning - Deliming - Dehydration - Evaluation of properties - Physical properties - RESULTS AND DISCUSSION : Tensile strength - Elongation at break - Percentage set - Stitch tear strength and tongue tear strength - Moisture absorption - Water vapour permeability En ligne : https://drive.google.com/file/d/1DpG9-czDMYM0dAe5zcu4E0yy0JeabC7Z/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31804 [article]

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Drum salting hides and skins / G. W. Vivian in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 149-155 Titre : Drum salting hides and skins Type de document : texte imprimé Auteurs : G. W. Vivian, Auteur ; M. B. Rands, Auteur Année de publication : 1976 Article en page(s) : p. 149-155 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux -- Conservation Cuirs et peaux -- Propriétés physiques Cuirs et peaux -- Teneur en matières grasses Cuirs et peaux de veaux Essais (technologie) Evaluation Peaux brutes -- Salage Polymérisation Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : This paper discusses preservation of calfskins and hides by drumming in dry salt. Pack tanning trials are reported that compare leather yield and quality from stack and drum cured hides. To eliminate yield deficiency and distribution of grease in the hair and the flesh, hides should be fleshed prior to drum salting, the temperature should not exceed 25°C during drumming (3h for calfskins ; 6h for hides) and the hides should be adequately spread out after curing. In New Zealand, six large plants use 4 rev/min. drums or mixers for curing hides and calfskins; 30% w/w salt, 0.5% w/w boric acid and 0.25% w/w naphthalene is the mixture used for each load. Note de contenu : - EXPERIMENTAL : Preliminary investigations - MAIN INVESTIGATION : Leather quality and yield from stack and drum cured hides - The effect of temperature during drum curing hides - Table 1 : Analysis of salted calfskins - Table 2 : Rate of curing of calfskins - Table 3 : Weight shrinkage tests - Table 4 : Hide weights at various stages - Table 5 : Hide areas before and after curing - Table 6 : Assessment of leathers before correction - Table 7 : Physical properties of finished leathers - Table 8 : Leather yields - Table 9 : Leather yields for hide types - Table 10 : Leather yields for individual packs - Table 11 : Greasiness of drum cured hides related to curing temperatures - Table 12 : Assessment of grain cleanliness En ligne : https://drive.google.com/file/d/1KH5VZKVknQ87NtbsGl5IHOVEv1h99ix8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31840 [article]

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Colour changes in wet blue leathers / J. R. Barlow in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 156-162 Titre : Colour changes in wet blue leathers Type de document : texte imprimé Auteurs : J. R. Barlow, Auteur Année de publication : 1976 Article en page(s) : p. 156-162 Langues : Anglais (eng) Catégories : Colorimétrie Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Wet-blue leathers were prepared in a factorial experiment, designed to study the effects of varying the type, concentration, basicity, and level of basification of the chromium complex on the initial colour and rate of colour change during storage. None of the variables affected the rate of colour change, over 45 days' storage at 0°C. Between-sample variability of colour remained constant during storage, was slightly reduced by a common rechroming and approximately halved by dyeing. Good correlation was found between colour differences in wet-blue leathers and shade variations in the dyed leathers. Note de contenu : - EXPERIMENTAL : Processing details - Colour measurement - RESULTS : Colour changes En ligne : https://drive.google.com/file/d/15MpYnIBBZEc6dhi4w3cJQB49KXJr8Kce/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31841 [article]

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Modern researches in leather dyeing / Samir Dasgupta in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 163-168 Titre : Modern researches in leather dyeing Type de document : texte imprimé Auteurs : Samir Dasgupta, Auteur Année de publication : 1976 Article en page(s) : p. 163-168 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Teinture Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The colour of the leather is the most important factor for its acceptance to the customer. Leather has other important characteristics such as water vapour permeability which are difficult to demonstrate convincingly to the customer. Recent developments in dyeing have contributed considerably towards producing serviceable leather in anticipation of the changing demand of the customer. Constant efforts should be made in the future to develop dyes with improved fastness properties, in particular dry-cleaning and perspiration fastness. Developments in the manufacturing technique of leather with better hydrothermal resistance would contribute towards improvements in continuous through-put dyeing systems. All these would further improve the competitive position of leather against synthetic materials. Note de contenu : - IMPROVEMENTS OF FASTNESS OF DYED LEATHER : Auxiliaries - Newer types of dyes - High temperature dyeing - NEWER TECHNIQUES OF DYEING : Dyeing through graft-polymerisation - Dyeing through tanning - Solvent-aided dyeing - Transfer printing - Continuous and newer processes of dyeing En ligne : https://drive.google.com/file/d/1kWryEkGectco3cQ2M_ifMAJPy8Q3WeR8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31843 [article]

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Introduction of intra- and inter-molecular cross-bonds by mono and bifunctional sulphonyl chlorides in soluble collagen / M. S. Olivannan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 12-15 Titre : Introduction of intra- and inter-molecular cross-bonds by mono and bifunctional sulphonyl chlorides in soluble collagen Type de document : texte imprimé Auteurs : M. S. Olivannan, Auteur ; Y. Nayudamma, Auteur Année de publication : 1976 Article en page(s) : p. 12-15 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de sulfonyle Collagène Dissolution (chimie) Electrophorèse Réticulation (polymérisation) Viscosité Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Collagen was treated with different sulphonyl chlorides and some of the physico-chemical properties of the modified collagen such as viscosity, dissolution temperature and polyacrylamide disc electrophoretic pattern were studied. The monofunctional sulphonyl chlorides increased the viscosity of the collagen solution, probably due to aggregation of molecules facilitated by hydrophobic bonds. However, the very high viscosity observed in the case of disulphonyl chlorides with collagen indicates that inter-molecular cross-links are formed with these reagents. From dissolution temperatures and polyacrylamide gel electrophoretic patterns, it is considered that disulphonyl chlorides can introduce intra- and inter-molecular cross-links in collagen under suitable conditions. Note de contenu : - EXPERIMENTAL : Preparation of soluble collagen - Treatment of soluble collagen with various sulphonyl chlorides - Viscosity measurements - Dissolution temperature - Acrylamide gel electrophoresis - RESULTS AND DISCUSSION : Viscosity - Dissolution temperature - Polyacrylalide gel electrophoresis - Table 1 : Relative viscosity of collagen treated with sulphonyl chlorides - Table 2 : Dissolution temperature of collagen treated with sulphonyl chlorides - Fig. 1 : Disc electrophoresis sub-unit patterns of collagen - Fig. 2 : Dis electrophoresis and sub-unit patterns of collagen - Fig. 3 : Disc electrophoresis sub-unit patterns of collagen En ligne : https://drive.google.com/file/d/1E2O7vmxkPNuTmBItAYrXh0FY7EQJ677n/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35259 [article]

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The lasting behaviour of shoe upper leather / J. A. J. Luijten in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 16-20 Titre : The lasting behaviour of shoe upper leather : Some experiments in connection with draft IUP/32 (TNO lastability tester) Type de document : texte imprimé Auteurs : J. A. J. Luijten, Auteur Année de publication : 1976 Article en page(s) : p. 16-20 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chaussures Cuirs et peaux -- Propriétés mécaniques Durée de vie (Ingénierie) Essais de résilience Essais dynamiques Résistance à la traction Tige de la chaussure Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Investigations into the effect of some factors on the results of the lastablity test have shown that a good reproducibility can be obtained. Comparing the results of the lastability test and those at grain crack of other tests (lastometer and tensile test) a moderate relationship was found in one comparison only. With the aid of the lastability test one will obtain more useful information about the lasting behaviour of the leather than with the lastometer and the tensile test. Note de contenu : - METHODS TO PREDICT THE BEHAVIOUR OF LEATHER DURING LASTING : TNO lastability tester (Draft IUP/32) - Lastometer (IUP/9) - Tensile strength (IUP/6) - AIM of the experiments - EXPERIMENTAL : Determination of the influence of the physical strength of the operator on ther esults of the lastability test - Determination of the influence of the experience of the operator on the results of the lastability test - Comparison of the results of lastabilty and lastometer tests within three hides of one batch - Comparison of the results of lastability and lastometer tests obtained in routine tests - Comparison of the results of lastability and tensile tests obtained in routine tests - Comparison of the behaviour during actual lasting with the results of lastability and lastometer tests - Comparison of the behaviour during actual lasting with the results of lastability and tensile tests - Table 1 : Results of lastability tests carried out by operators with different physical strength - Table 2 : Analysis of variance of the result of lastability tests carried out by operators with different experience with this test - Table 3 : Comparison of the results of lastability (Draft IUP/32) and lastometer tests (IUP/9) within two hides of one batch - Table 4 : Correlation coefficients of the results given in table 3 - Table 5 : Comparison the results of lastability and lastometer tests within three hides of one batch - Table 6 : Correlation coefficients of the results of table 5 - Table 7 : Comparison of the results of lastability and lastometer tests obtained in routine tests - Table 8 : Comparison of the results of lastability and tensile tests obtained in routine tests group - Table 9 : Results of lastability and lastometer tests carried out in shoe upper leathers which show grain cracks during lasting - Table 10 : Results of lastability and tensile tests carried out in shoe upper leathers which show grain cracks during latsing En ligne : https://drive.google.com/file/d/1Wmx05mXmKXxYfA7rfjGlzp-B-G8TmvY_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35260 [article]

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On the shrinkage kinetic of collagen / Guillermo O. Sarli in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 113-114 Titre : On the shrinkage kinetic of collagen Type de document : texte imprimé Auteurs : Guillermo O. Sarli, Auteur ; J. Raùl Grigera, Auteur Année de publication : 1976 Article en page(s) : p. 113-114 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène Cuirs et peaux Température de retrait Thermocinétique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The shrinkage kinetic of collagen was first used by Weirl to measure the activation enthalpy and entropy of the fibre-random coil transition of collagen. The early results shown a relative simple kinetic, characterised by a single parameter, namely the half time of the process. Later on, a more sophisticated intepretation of the kinetic was suggested. The curves shown in these works are very simple. The stability of collagen fibres is widely measured by means of the shrinkage temperature. This parameter is very easy to measure and, if the process is as simple as was described, it may well characterise the transition with enough accuracy. It is probable that on this account there have not been many new works published on shrinkage kinetic. Note de contenu : - Fig. 1 : Diagram of the apparatus - Fig. 2a : Shrinkage kinetic of rat tail tendon hydrated 24 h in distilled water, a) Shrunk inwater - Fig. 2b : Shrunk in aqueous solution of dioxane 4:11 molal. En ligne : https://drive.google.com/file/d/1NBQSXEFcgv_cWRfShkCnoB3elCrpObb0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35261 [article]

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The successful practice of leather dyeing / J. B. Knapton in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 128-132 Titre : The successful practice of leather dyeing Type de document : texte imprimé Auteurs : J. B. Knapton, Auteur ; H. E. Nursten, Auteur Année de publication : 1976 Article en page(s) : p. 128-132 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants Cuirs et peaux -- Teinture Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The aim here is to help make better leather, in particular to be able to dye it better. The difficulties in dyeing can be attributed in part to the leather, in part to the dyes, and in part to the process itself. Relevant points about dyes and about the substrate are therefore first reviewed briefly, and then the process of dyeing is considered, stress being laid particularly on the need to standardise the process as far as possible. Standardising does not mean that ail leather should be the same, but that, when a particular type of leather is being produced, variations between batches and between individual pieces within batches are reduced as far as possible. Note de contenu : - The dyes - Leathers - Standardisation of the dyeing process : Standardisation of equipment - Standardisation of load - Standardisation of dyes - Choice of dyes - Quality of the water supply - Standardisation of dyeing process - Washing off - Post-dyeing operations - Control of standardisation - Fig. 1 : Stereoscan electron micrograph of the surface of wet chrome leather En ligne : https://drive.google.com/file/d/1u4GZG4qlhlY7L_a7MBXWqwERXdhQ9Chn/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35262 [article]

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A simple approach to leather process investigation / P. Laight in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 1-11 Titre : A simple approach to leather process investigation : Part 1 - The introduction of variants in the liming, conditioning/staking and retannage/fatliquoring sub-processes Type de document : texte imprimé Auteurs : P. Laight, Auteur ; A. G. Ward, Auteur ; S. Wolstenholme, Auteur Année de publication : 1976 Article en page(s) : p. 1-11 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chaulage Conditionnement Cuirs et peaux Palissonnage Produits de nourriture du cuir Retannage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The process, already described in J. Soc. Leather Tech. Chem. (1974), 58, 88, for making standard segments of chrome tanned upper leather, has been modified by the introduction of selected variants. The subprocesses which have been varied are: (i) liming; (ii) staking and conditioning; (iii) retannage and fatliquoring. Control segments made by the unmodified standard process have been included as a part of each pack. In addition to measurements made during processing, the leathers produced have been assessed for their main mechanical properties, using both subjective and objective methods. The results show the exceptional reproducibility of the standard process itself and so enable the effects of the variants to be reliably assessed. The marked effect of increased duration of liming on subjective properties is not reflected in all the physical test results. The degree of staking employed (Mollisa) resulted in significant differences in subjective properties and in the stress/strain properties for low strains. The use of glutaraldehyde retannage and of a higher level of fatliquor produced significant differences in certain of the mechanical properties which were measured or assessed. Statistical analyses have been applied to the results of the factorial designs employed. Note de contenu : - The standard process and the leathers produced from it (Packs 1-5) - The liming variant - The conditioning/staking variant - Table 1 : Water content as a percentage of dry fat free solids of pelt equilibriated with pH 3-72 buffer - Table 2 : Variants introduced in the standard chrome side leather process - Table 3 : Test results on completion of sub-process. Standard process II. Means, ranges and range of admissible variation (RAV) packs 4 and 5 - Table 4 : Mean values of test results for leathers front packs 1 and 2 (standard process I), pack 3 (standard process I with delays in brine and chrome pile), packs 4 and 5 (standard process II). For tensile specimens AI, M4, P4 perpendicular to backbone, M2 parallel to backbone - Table 5 : Standard process H, packs 4 and 5. Mean values and the confidence limits for packs and sub-packs of two or four segments. (mean ± A gives the confident limits) - Table 6 : Overall average values (packs 1 to 9) of 72 segments for weight and area during processing. Area values for sub-processes prior to drying are compared (as %) with the original area, for drying and after estimates are used, correcting for trimming of one end. Weights are related to the appropriate stages at which material was removed (original, lime splitting, shaving, end trimming) - Table 7 : Comparison of standard (mean packs 4, 5), and lime variant (mean packs 1, 2) leathers. student's "t" test (30 degrees of freedom). Calculated "t" values - Table 8 : Comparison of standard (mean packs 4, 5) and lime variant (mean packs 1, 2) leathers. student's "t" test (30 degrees of freedom), calculated "t" values - Table 9 : Conditioning/dtaking bariant. Allocation of degments 41-48 were collected from slaughter house one week before 49-56 - Table 10 : Overall treatment means for the Pairs of segments receiving identical conditioning/staking levels - Table 11 : Two-way table of means for whole Segment subjective break values. Conditioning/staking variant - Table 12 : Two-Way Table of means for stress at 10% extension (kg cm-2). Conditioning/staking variant - Fig. 1 : Location of segment and test squares on the side En ligne : https://drive.google.com/file/d/1vj-qu2LdEERKvqdUQgzHaRr0le_y0-qW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35263 [article]

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