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Some bygone leathers and their reincarnations / Joe Dewhurst in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 6 (11-12/2014)
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Titre : Some bygone leathers and their reincarnations Type de document : texte imprimé Auteurs : Joe Dewhurst, Auteur Année de publication : 2014 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux Index. décimale : 675 Technologie du cuir et de la fourrure Note de contenu : - Himeji - Dongola - Latigo - Helvetia - Oil 'tannage' - Vellum - Parchment - Shagreen - Drumskins - Dog chews - Buffalo rawhide - Pickers - Buffalo Hammers - Scabbard leather - Sulphur in leather - Belting leather - Round banding - Textile leathers - Roller leather - Comber leather - Hydraulic leathers - Oil seal shoulders - Friction leather - Sole leather - Equestrian leathers En ligne : https://drive.google.com/file/d/1hQ_HOD1z_Fi4HDSrlqYn1YAkZiDM0iZH/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22644
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Code-barres Cote Support Localisation Section Disponibilité 16734 - Périodique Bibliothèque principale Documentaires Disponible Some investigations into methods of unhairing - I. Lime-sulphide processing / R. S. Andrews in JOURNAL OF THE SOCIETY OF LEATHER TRADES' CHEMISTS, Vol. 50, N° 6 (06/1966)
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Titre : Some investigations into methods of unhairing - I. Lime-sulphide processing Type de document : texte imprimé Auteurs : R. S. Andrews, Auteur ; Mary Dempsey, Auteur Année de publication : 1966 Article en page(s) : p. 218-245 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chaux Sulfurée
Cuirs et peaux de moutons
Epilage
Hydroxyde de sodiumL'hydroxyde de sodium, appelé également soude caustique7, est un corps chimique composé minéral de formule chimique NaOH, qui est à température ambiante un solide ionique. Fusible vers 318 °C, il se présente généralement sous forme de pastilles, de paillettes ou de billes blanches ou d'aspect translucide, corrosives et très hygroscopiques. Il est très soluble dans l'eau et légèrement soluble dans l'éthanol.
La solution d'hydroxyde de sodium, souvent appelée soude, est une solution aqueuse transparente. Concentrée, elle est corrosive et souvent appelée lessive de soude.
Les propriétés chimiques de l'hydroxyde de sodium sont surtout liées à l'ion hydroxyde HO- qui est une base forte. En outre, l'hydroxyde de sodium réagit avec le dioxyde de carbone (CO2) de l'air et se carbonate.
La solubilité de la soude caustique dans l'eau augmente avec la température, à pression constante ou ambiante.
Sulfure de sodiumIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Experimental lime-sulphide treatment has been assessed from the fibre structure of the pickled pelt (after fixing it in formalin + salt) compared with that from "normal" processing : soaking, liming, deliming, bating and pickling, or soaking, painting, liming, deliming, bating and pickling. Ease of unhairing and removal of epidermis have also been considered. The investigation included experiments on the influence of temperature, composition of the lime liquor, alkaline baths subsequent to painting, duration of piling in paint and composition of tir ; paint.
Unhairing and epidermis removal are shown to be two different process.cs under the conditions of lime-sulphide treatment, in which unhairing is only removal of hair shaft leaving the root and a short length of shaft within the grain layer. The paint, penetrating from the flesh, appeared to have passed the root, both bulb and club types, as well as newly initiated hair papillae, and begun attack on the hair at the level of the sebaceous gland. Breakdown of the hair shaft can extend both inwards towards the root and outwards along the free hair shaft: the hair cuticle was more resistant than the internai structure. Readily visible damage to the free hair shaft was caused by high amount of water in the paint or high amount of sulphide in the presence of high amount of water.
The "normal" paint used in the experiment was approximately 0-8 g Na2S + 5 g lime + 7 g water to 100 g pelt, and at the end of piling for 24 hours belly unhaired readily but butt did not. With this paint, increased time in pile did not improve the degree of unhairing, nor did raised temperature which did however, improve the removal of epidermis. Liming after painting completed unhairing and removal of epidermis, but it seems possible that caustic soda after painting might have an adverse effect on unhairing if this has not at least begun at the end of piling. Caustic soda in the paint did not improve unhairing, but where the hair was loose the removal of epidermis was seen to be easier than in its absence.
Painting opened up fibre bundles but did not open up the weave pattern, in contrast to liming or to painting followed by liming, after which fuller fibre bundles and less compactly interweaving pattern occurred. Increasing sodium sulphide in the paint increased splitting up and, especially when the pelt was piled at raised temperature, led to separation and a damaged appearance of the fibre structure. Caustic soda in a lime-sulphide paint, increased the fullness of the fibre bundles. Raised temperature had a marked effect in opening up the structure, particularly of the belly, which, at room temperature, usually appeared little opened up.
Immersion and movement in lime liquor containing a low concentration of sodium sulphide satisfactorily unhaired the pelt, and, especially at raised temperature, opened up the fibre structure.Note de contenu : - Materials and methods
- Alkaline treatment subsequent to painting : Unhairing
- Experiments on flesh side painting : Duration of piling in paint - Composition of the Paint - Microscopical observations
- Composition of the lime liquor : Unhairing and Epidermis Removal - Fibre structure
- Table 1 : Experimental treatments and scores for hair removal
- Table 2 : Flesh-painting experiments
- Table 3 : Scores for hair removal after piling in paint
- Table 4 : Composition of the paint : Amount of sodium sulphide or caustic soda scores for unhairing and removal of epidermis
- Table 5 : Hair and epidermis : Scores
- Table 6 and 7 : Hair and epidermis removalPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35679
in JOURNAL OF THE SOCIETY OF LEATHER TRADES' CHEMISTS > Vol. 50, N° 6 (06/1966) . - p. 218-245[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007071 - Périodique Bibliothèque principale Documentaires Disponible Some observations on industrial leathers / T. Waite in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 70 (Année 1986)
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Titre : Some observations on industrial leathers Type de document : texte imprimé Auteurs : T. Waite, Auteur ; P. Elliott, Auteur Année de publication : 1986 Article en page(s) : p. 129-134 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The background and activities of the once thriving industrial leather production of the United Kingdom is described, with reference to the history of a typical small company engaged in this field. Some reasons are proposed for the over-decline of the industry, together with a plea for increased recognition of the capabilities of the remaining producers and their relevance to the leather industry as a whole. En ligne : https://drive.google.com/file/d/1M6tUDRdWdB8UBo49nkebSpHTSztUixk0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9229
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Code-barres Cote Support Localisation Section Disponibilité 007133 - Périodique Bibliothèque principale Documentaires Disponible Some peculiarities of processing leather from short term preserved hide / Kestutis Beleska in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 6 (11-12/2017)
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Titre : Some peculiarities of processing leather from short term preserved hide Type de document : texte imprimé Auteurs : Kestutis Beleska, Auteur ; V. Valeikienè, Auteur ; S. Mikulytè, Auteur ; Virgilijus Valeika, Auteur Année de publication : 2017 Article en page(s) : p. 290-295 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Conservation Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Salt curing is a method that is Widely used for the preservation of raw hides/skins worldwide and this load to the enhanced pollution load of tannery by chlorides. The application of alternative short term preservation methods can leed to a Substantial decrease in materials consumption. Unfortunately, the application of new methods of short term preservation has not proceeded due to two main reasons : the complication of the-preposed preservation method used and unfamiliarity with new chemicals. In this study, attempts have been made to show some peculiarities which occur when processing hide subjected to short term preservation by sprinkling with a dry mixture containing 5% NaCl and 1% (salt-less method). Dehydration and rehydration of the short term preserved hides was investigated, and it was established that simple washing for 2 hours is appropriate to rehydrate preserved hide qualltatively end to remove surplus sodium chloride.
Short term preserved hide is more susceptible to the action of the unhairing-liming process, and collagen and non-collagen proteins of short term preserved hide are affected more during liming than are proteins of a conventionally salted one. The preservation method has an influence on chromed leather ares yield..Wet-blue leather processed from short term preserved hides has 1.4% higher area yield than that produced from salted hide. The shoe upper leather produced from short term preserved hide contained slightly more chromium and fatliquor but the method of preservation had no influence oh strength and organoleptic properties of the shoe upper leather produced.Note de contenu : - EXPERIMENTAL PROCEDURES : Raw material - Equipment - Chemicals
- PARAMETERS OF HIDE PROCESSING
- ANALYTICAL METHODS
- RESULTS AND DISCUSSION : Dehydration and rehydration of preserved hide - Influence of liming on hide proteins - Influence of preservation method on area yield of wet-blue leather - Industrial trialsEn ligne : https://drive.google.com/file/d/1ejuSZzwV6W54Zgux22CJz0FGTLEcSQdY/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29667
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Code-barres Cote Support Localisation Section Disponibilité 19446 - Périodique Bibliothèque principale Documentaires Disponible Some properties of pickled hides / Betty M. Haines in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 57 (Année 1973)
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Titre : Some properties of pickled hides Type de document : texte imprimé Auteurs : Betty M. Haines, Auteur ; R. L. Sykes, Auteur Année de publication : 1973 Article en page(s) : p. 153-165 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Conservation
Cuirs et peaux de moutons
PicklageLe 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.
Travail de rivière (cuir)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A recent development is the trading of hides in the pickled condition. In order to provide some information on this relatively new commodity studies have been carried out which form the core of the present paper.
Pickled hides were found to differ significantly in composition from pickled sheepskins. The hide substance content was found to be double that of pickled sheep, and the moisture content to be in the region of 50% compared with 60% for drained sheepskin. Although the acid and the salt contents were appreciably less than the current acceptable levels for a pickled sheepskin, the pH of water extract being generally about 2-6, there was no evidence of deterioration on storage : all pickled hide examined had been treated with a fungicide.
Many of the pickled hides were processed into sole leather which was analysed, subjected to physical tests and examined microscopically. Non of the leathers showed any abnormal properties. Some of the leathers had been prepared from only half the hide, the other half being processed to the leather stage without pickling. This comparison showed that pickled stock yielded a leather with a higher tanning figure and degree of tannage. The water resistance properties tended to be somewhat impaired by pickling but the abrasion rates were satisfactory.Note de contenu : - Sample preparation
- Moisture content
- Salt content
- Total protein (hide substance)
- Soluble nitrogen
- The procedure follows
- pH of aqueous extract and acid content
- Shrinkage temperature
- Tearing strength
- Microscopal examination
- Table 1 : Results of preliminary experiments with pickled hides
- Table 2 : Effect of storage on the properties of pickled hide
- Table 3 : Initial properties and storage stability on pickled hides of various origins
- Table 4 : Effect of pickling on the properties of vegetable tanned sole leather (differences from un-pickled control)
- Table 5 : Analyses of spent pickle liquors
- Table 6 : Composition of pickled pelt - initially and after storageEn ligne : https://drive.google.com/file/d/1mh5ekiRI017i74_1I64hK45yOgFsw764/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31693
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 57 (Année 1973) . - p. 153-165[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008593 - Périodique Archives Documentaires Exclu du prêt Some recent problems associated with the use of leather in footwear uppers / David Popplewell in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXIV (Année 1979)
PermalinkSome useful guidelines for the selection of dyes / Henri Gardere in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIII, N° 7 (09/1998)
PermalinkSomes notes on the analysis of pickled skins / A. Vos in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59 (Année 1975)
PermalinkSoy protein isolate reinforced yak skin collagen edible films for ultraviolet barring function / Ruirui Wang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 4 (07-08/2019)
PermalinkSpace saving and prototyping spray systems / Karl Flowers in INTERNATIONAL LEATHER MAKER (ILM), N° 58 (03-04/2023)
PermalinkSpecial review : anaerobic digestion of leather industry wastes - An alternate source of energy / Guilherme P. S. Priebe in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 2 (02/2017)
PermalinkSpecial review paper : applications of microwave in leather field : further research for leather chemists and technologists / Jinwei Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 9 (09/2017)
PermalinkSpecial review paper : Enzymes in the leather industry / Aline Dettmer in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 4 (04/2013)
PermalinkSpecial review paper : leather dyeing with biodyes from filamentous fungi / Wagner Fernando Fuck in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 9 (09/2018)
PermalinkSpectrophotometric analysis of anionic leather dyes as ion-pairs / D. Muralidharan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 79, N° 4 (07-08/1995)
PermalinkSpectrophotometric analysis of catechins and condensed tannins using Ehrlich's reagent / D. Muralidharan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 6 (11-12/1997)
PermalinkSpectrophotometric determination of chromium in leather using diphenyl carbazide and malachite green / S. Balasubramanian in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 5 (09-10/1997)
PermalinkSpectroscopy and modelling : a new generation in leather technology / M. Marjoniemi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 79, N° 2 (03-04/1995)
PermalinkPermalinkPermalinkPermalinkStability of complexes in chromium sulfate solutions and their affinity for collagen / Kazuaki Takenouchi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)
PermalinkStabilization of collagen by cross-linking with a ferrous-gluconic acid compound / Yang Mao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 2 (03-04/2015)
PermalinkStaking and its interaction with fatliquoring on vacuum-dried leather / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 9 (09/2002)
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