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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]
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 sodiumLe 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 sodiumIndex. 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 hideEn ligne : https://drive.google.com/file/d/1BYflZaYySpT9U1YXujNCKkYIxeOMNKQ1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38787
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 248-2260[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]
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 chaussureIndex. 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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38790
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 372-379[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008509 - Périodique Archives Documentaires Exclu du prêt Raman and ATR-FTIR spectroscopy towards classification of wet blue bovine leather using ratiometric using ratiometric and chemometric analysis / Megha Mehta in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 2 (Année 2020)
[article]
Titre : Raman and ATR-FTIR spectroscopy towards classification of wet blue bovine leather using ratiometric using ratiometric and chemometric analysis Type de document : texte imprimé Auteurs : Megha Mehta, Auteur ; Rafea Naffa, Auteur ; Catherine Maidment, Auteur ; Geoff Holmes, Auteur ; Mark Waterland, Auteur Année de publication : 2020 Article en page(s) : 15 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse multivariée
Cuirs et peaux -- Analyse
Cuirs et peaux -- Défauts
Cuirs et peaux de bovins
Réflexion totale atténuée
Spectroscopie Raman
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : There is a substantial loss of value in bovine leather every year due to a leather quality defect known as “looseness”. Data show that 7% of domestic hide production is affected to some degree, with a loss of $35 m in export returns. This investigation is devoted to gaining a better understanding of tight and loose wet blue leather based on vibrational spectroscopy observations of its structural variations caused by physical and chemical changes that also affect the tensile and tear strength. Several regions from the wet blue leather were selected for analysis. Samples of wet blue bovine leather were collected and studied in the sliced form using Raman spectroscopy (using 532 nm excitation laser) and Attenuated Total Reflectance - Fourier Transform InfraRed (ATR-FTIR) spectroscopy. The purpose of this study was to use ATR-FTIR and Raman spectra to classify distal axilla (DA) and official sampling position (OSP) leather samples and then employ univariate or multivariate analysis or both. For univariate analysis, the 1448 cm− 1 (CH2 deformation) band and the 1669 cm− 1 (Amide I) band were used for evaluating the lipid-to-protein ratio from OSP and DA Raman and IR spectra as indicators of leather quality. Curve-fitting by the sums-of-Gaussians method was used to calculate the peak area ratios of 1448 and 1669 cm− 1 band. The ratio values obtained for DA and OSP are 0.57 ± 0.099, 0.73 ± 0.063 for Raman and 0.40 ± 0.06 and 0.50 ± 0.09 for ATR-FTIR. The results provide significant insight into how these regions can be classified. Further, to identify the spectral changes in the secondary structures of collagen, the Amide I region (1600–1700 cm− 1) was investigated and curve-fitted-area ratios were calculated. The 1648:1681 cm− 1 (non-reducing: reducing collagen types) band area ratios were used for Raman and 1632:1650 cm− 1 (triple helix: α-like helix collagen) for IR. The ratios show a significant difference between the two classes. To support this qualitative analysis, logistic regression was performed on the univariate data to classify the samples quantitatively into one of the two groups. Accuracy for Raman data was 90% and for ATR-FTIR data 100%. Both Raman and ATR-FTIR complemented each other very well in differentiating the two groups. As a comparison, and to reconfirm the classification, multivariate analysis was performed using Principal Component Analysis (PCA) and Linear Discriminant Analysis (LDA). The results obtained indicate good classification between the two leather groups based on protein and lipid content. Principal component score 2 (PC2) distinguishes OSP and DA by symmetrically grouping samples at positive and negative extremes. The study demonstrates an excellent model for wider research on vibrational spectroscopy for early and rapid diagnosis of leather quality. Note de contenu : - EXPERIMENTAL : Sample preparation - Data acquisition and spectral processing
- RESULTS AND DISCUSSION : Peaks of interest - Univariate analysis - Multivariate analysis
- Table 1 : Raman and infrared spectroscopic band assignments for Wet Blue leather
- Table 2 : Raman band assignments distinguishing loose and tight wet blue leather
- Table 3 : Deconvoluted amide I band assignments for protein secondary structures
- Table 4 : Confusion matrix for Raman univariate analysis
- Table 5 : Confusion matrix for IR univariate analysis
- Table 6 : Confusion matrix for the classification of OSP and DA based on the PCA-LDA modelDOI : 10.1186/s42825-019-0017-5 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-019-0017-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37139
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 2 (Année 2020) . - 15 p.[article]Re-utilisation of biomass resources : preparation and application of a bio-polymer retanning agent based on cattle hair hydrolysate / Luo Jianxun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 1 (01-02/2020)
[article]
Titre : Re-utilisation of biomass resources : preparation and application of a bio-polymer retanning agent based on cattle hair hydrolysate Type de document : texte imprimé Auteurs : Luo Jianxun, Auteur ; Ma Hewei, Auteur ; Feng Yanjuan, Auteur Année de publication : 2020 Article en page(s) : p. 39-43 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biomasse
Cuirs et peaux de bovins
Cuirs et peaux de moutons
Formulation (Génie chimique)
Poids moléculaires
Poils -- Recyclage
Polyaddition
polymères vinyliques
Retannage
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In order to promote the development of clean production of leather-making and to re-cycle the cattle hair from a hair-saving process, the hair is hydrolysed and may in some circumstances find an application. But, because the cattle hair hydrolysate has a small molecular weight and poor properties in retanning of leather, it was modified with vinyl monomers by radical co-polymerisation using ammonium persulfate at 80°C for 3 hours to obtain a bio-polymer retanning agent. Comparing the viscosity and retanning properties of the bio-polymer retanning agent, the mol ratio of acrylic acid, acrylamide used was confirmed to be 4.0:1.0 and the consumption of acrylic acid, acrylamide is 80% based on the content of the hydrolysate. The structure of the bio-polymer retanning agent was characterised by FTIR. Application results of the bio-polymer retanning agent on the retanning of the shaved sheepskin wet-blue show that it has good retanning and filling properties. When the optimal consumption of the bio-polymer retanning agent is in the range of 6% and 8%, the retanned leather is full, more uniform than before and lacks any plastic feeling. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Preparation of the bio-polymer retanning agents - Application of series of the bio-polymers and the selection of the best synthetic recipe - Molecular weight of the bio-polymer retanning agent and its structure determination - Application and the optimum amount of the bio-polymer retanning agent applied on the shaved sheepskin wet blue
- RESULTS AND DISCUSSION : Analysis of the optimised formulation of the biopolymer - Analysis of the molecular weight and the structure optimised formulation of the biop-polymer and its characteristicsEn ligne : https://drive.google.com/file/d/1DIJBWXlXhfTwVd6TZR-EUJyR_8FiWonZ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33542
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 104, N° 1 (01-02/2020) . - p. 39-43[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21508 - Périodique Bibliothèque principale Documentaires Disponible Redevelopment of medieval leathers for the curragh "Brendan's" transatlantic voyage 1976-77 / H. A. Birkin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61 et 62 (Années 1977 et 1978)
[article]
Titre : Redevelopment of medieval leathers for the curragh "Brendan's" transatlantic voyage 1976-77 Type de document : texte imprimé Auteurs : H. A. Birkin, Auteur ; P. Elliott, Auteur ; C. Postles, Auteur ; A.-G. Marriott, Auteur ; R. L. Sykes, Auteur Année de publication : 1978 Article en page(s) : p. 55-62 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Archéologie
Bateaux -- Conception et construction
Coques (architecture navale)
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 -- Effets de la température
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés physiques
Cuirs et peaux de bovins
Essais de résilience
Evaluation
Immersion
Matériaux -- Imprégnation
Résistance à l'eau salée
Résistance à l'humidité:Résistance à l'eau
Résistance à la traction
Tanins végétaux
Technologie -- Moyen âgeIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The paper is a descriptive account of work undertaken to re-create medieval leathers for use in an exercise in experimental archaeology—namely the Brendan voyage 1976-77. Leather for the boat's hull was made from oak-tanned ox hide impregnated with wool grease; it contained 35% dichloromethane extractables (IUC/4), had a water absorbtion (IUP/7) of 14% after 72 h, and resisted penetration by 3.5 % saline for more than 2000 h (IUP/1 1). The wooden frame was lashed together with alum tanned laces, which had a wet-breaking load of 45 kg. The transatlantic voyage of 4500 miles was completed in two stages and took 111 days (85 days at open sea), the hull leather retained its structural stability and initial water resistance. Note de contenu : - Developmment of the hull leather : Materials - Test programme - Results
- Verification of performance
- Table 1 : Performance of various dressed industrial leathers
- Table 2 : Effects of different impregnants on the dimensional stability and water resistance of various crust leathers
- Table 3 : Effect of drying sammed leagther under 10% linear extension on physical properties
- Table 4 : Range of test data obtained froom leathers used construction of the hull
- Table 5 : Performance of lace leathers
- Table 6 : Evaluation of hull leather which had endured the transatlantic crossing
- Fig. 1 : Projected route of Brendan voyage
- Fig. 2 : Schematic diagram of Brendan
- Fig. 3 : Effect of immersion time and temperature on apparent uptake of wool grease during static immersion. Dashed line shows fall in tensile strength with extended impregnation at 50°C
- Fig. 4 : Partly constructed hull, leather laces holding the frame are in the foreground ; a line of handstitching on the hull leather can be seen top left
- Fig. 5 : Brendan and crew shortly after launchingEn ligne : https://drive.google.com/file/d/1cgOTZjDf-45dcfFZvNyucyKSUuwzOvNo/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35220
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 61 et 62 (Années 1977 et 1978) . - p. 55-62[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008597 - Périodique Archives Documentaires Exclu du prêt Redevelopment of medieval leathers for the curragh "Brendan's" transatlantic voyage 1976-77 / H. A. Birkin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 62, N° 3 (05-06/1978)
PermalinkRéflexions sur la transformation des peaux de bovins / Hans Herfeld in TECHNICUIR, (Années 1969-1970)
PermalinkPermalinkPermalinkRelationship between physical and chemical characteristics of vegetable tanned sole leathers of indian origin / G. Gangi Reddy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61, N° 6 (11-12/1977)
PermalinkResource utilization of bovine hair recycling from enzymatic unhairing during leather manufacturing : Alkali-protease synergistic preparation of keratin and its in vitro antioxidant activity / Ting Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 9 (09/2023)
PermalinkSalt determination in salted bovine hide / Jaume Soler in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 6 (11-12/2014)
PermalinkScreening of additives to reduce grain damage risk on unhairing by proteinase K / Mei Chen in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 2 (Année 2020)
PermalinkSoaking : Balancing operational and quality issues using both fresh and brine cured hides / George Stockman in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 3 (02/2008)
PermalinkStretching and stress-relaxation of leather / Albert M. Manich in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 3 (05-06/2006)
PermalinkStructure of skin in collagenous fibres : crossbreeds from black-and-white-cows X bulls of beef breeds / Piotr Zapletal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 6 (11-12/2001)
PermalinkStudies of the cause of the vertical fibre hide structure in hereford cattle hide / J. H. Dufty in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 67 (Année 1983)
PermalinkStudies 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)
PermalinkStudies on the source of contamination of hides by collagenolytic bacteria / D. E. Rawlings in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 58 (Année 1974)
PermalinkA study of fat spew by gas chromatography / Jean J. Tancous in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXIX (Année 1974)
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