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Effect of acid swelling and its impact on the properties of cow industrial glove leathers / Murali Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 6 (06/2023)
[article]
Titre : Effect of acid swelling and its impact on the properties of cow industrial glove leathers Type de document : texte imprimé Auteurs : Murali Sathish, Auteur ; Palanisamy Thanikaivelan, Auteur ; Nayan Sarkar, Auteur ; Rathinam Aravindhan, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2023 Article en page(s) : p. 235-244 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acides organiques
Colorimétrie
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 -- Analyse
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux -- Propriétés thermiques
Cuirs et peaux de bovins
Gants
Gonflement (physique)
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.
Post-tannage
Stabilité thermique
Tannage au chrome
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The development of commercially successful salt-free chrome tanning technology is the need of global leather sector to reduce the total dissolved solids in wastewater. Though some attempts have been made to develop salt-free chrome tanning technology, drawbacks such as slow diffusion of chromium, unevenness in softness and other organoleptic properties are the major concern. The generation of localized acid swelling might be a reason for the above drawbacks and no scientific literature available for the same. Hence, it is important to analyze the effect of acid swelling and its impact on the diffusion of chromium, ageing characteristics of wet-blue leather and physical properties of crust leather. The results show that the acid swelling delays the diffusion of chromium in tanning process and also enhances the growth marks on wet-blue leather. The ageing study reveals that the wet-blue obtained from acid swollen system dehydrates faster than the conventional salt based chromium tanning system. In addition, the wet-blue leather from acid swollen system is prone to fungal attack. The industrial glove leather obtained from acid swollen system has reduced strength characteristics viz., 15% reduction in tensile strength, 17% reduction in tear strength and 20% reduction in grain crack/bursting strength. Further, the degree of heterogeneity in softness is high for crust leather obtained from acid swollen system and also more looseness with internal emptiness. Color value measurements reveal that the crust leather obtained from the conventional tanning system is lighter in shade than the acid-swollen system. The results will be useful to design commercially viable salt-free or low-salt tanning systems as well as to tackle the inadvertent industrial scenario where the tanners are looking for solutions for accidental acid swelling and subsequent salvage of the leathers for possible recovery and applications. Note de contenu : - INTRODUCTION : Pickling with non-sweeling acid - Pre-treatment with weak organic acid
- MATERIALS AND METHODS : Chromium tanning and post-tanning process - Analysis of thermal stability - Ageing characteristics of wet-blue leather - Microscopic analysis - Physical strength characteristics and organoleptic properties - Color value measurements
- Table 1 : Process recipe for tanning the delimed cow pelts
- Table 2 : Process recipe for the manufacture of cow industrial glove leather from chrome tanned cow wet blue (Thickness: 1.0-1.1 mm)
- Table 3 : Changes in weight of cow pelts and leathers
- Table 4 : Changes in thickness and area of cow pelts and leathers
- Table 5 : Hydrothermal shrinkage temperature at different processing stages
- Table 6 : Physical properties of crust leathers
- Table 7 : Organoleptic properties of crust leathers
- Table 8 : Color value measurement of wet-blue and crust leatherDOI : https://doi.org/10.34314/jalca.v118i6.7657 En ligne : https://drive.google.com/file/d/1oHLiX_RkSCNDjpuZpyhxxvz0C-oPiGFq/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39480
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 6 (06/2023) . - p. 235-244[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24080 - Périodique Bibliothèque principale Documentaires Disponible Effect of a-amylase treatment on the tensile properties of steerhide and leather / Warren Melville in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXII (Année 1977)
[article]
Titre : Effect of a-amylase treatment on the tensile properties of steerhide and leather Type de document : texte imprimé Auteurs : Warren Melville, Auteur ; Clara Deasy, Auteur Année de publication : 1977 Article en page(s) : p. 216-229 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amylase L'amylase (EC 3.2.1.1) est une enzyme digestive classée comme saccharidase (enzyme qui brise les polysaccharides). C'est surtout un constituant du suc pancréatique et de la salive, requis pour le catabolisme des glucides à longue chaîne (comme l'amidon) en unités plus petites. L'amylase est également synthétisée dans de nombreuses espèces de fruits pendant leur maturation, ce qui les rend plus sucrés, et aussi durant la germination des grains de céréales. Elle joue un rôle essentiel dans l'amylolyse (ou hydrolyse) de l'amidon de malt d'orge, processus nécessaire à la fabrication de la bière, ainsi que dans l'hydrolyse du glycogène, permettant sa transformation en glucose.
Il y a deux iso-enzymes de l'amylase : l'amylase pancréatique et l'amylase salivaire. Elles se comportent différemment au focusing isoélectrique, et peuvent être séparées en testant par les anticorps monoclonaux spécifiques. La ptyaline ou amylase salivaire est une substance qui existe dans la salive.
L'alpha-amylase brise les liens α(1-4)glycosidiques à l'intérieur des chaînes de l'amylose et de l'amylopectine pour ultimement donner des molécules de maltose (disaccharides de α-glucose). Elle ne peut attaquer que les amidons hydratés et cuits. Possède un site de liaison à l'émail donc participe à l'élaboration de la pellicule acquise exogène. Se lie avec affinité au Streptococcus viridans (en) ce qui conduit à sa clairance ou à son adhésion selon que l'amylase est en solution ou adsorbée à la surface dentaire. L'amylase liée à une bactérie conserve environ 50 % de son activité enzymatique. La bactérie liée à l'amylase peut donc fermenter le glu que celle-ci produit en acide organique.
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux de bovins
Essais dynamiques
Tannage au chrome
Traction (mécanique)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The effect of α-amylase treatment on the tensile properties of steerhide and leather was examined.
Bacterial or fungal α-amylase in acetate buffer at pH 5.6 and 35°C. digests carbohydrte-containing components (groud substance) from fresh steerhide and from fresh lime/sulfide unhaired steerhide, forming reducing substances. The α-amylase treatment did not affect the load to break of fresh steerhide, corium split, or lime/sulfide unhaired steerhide when they were tested wet. There was also no increase inload to break of unfatliquored wet blue leather that had received the α-amylase treatment. However, similar dry blue leather specimens showed a significantly higher load to break if enzyme-treated. This effect appears to be due to a more complete removal of ground substance during the enzyme treatment, so that the cementing action of the ground substance on the collagen fibers is decreased ; this cementing action is greater in the dry leather specimens than in the wet.
When α-amylase-treated, chrome-tanned steerhide was atliquored and tested dry, there was an increase in the load to break compared to that of similarly treated stock that had not received the α-amylase treatment. Microscopic examination showed that greater penetration of fatliquor had occured in the enzyme-treated stock, a reflection of greater removal of ground substance.
The α-amylase treatment had no effect on the mirostructure of the steerhide. It did not affect the penetration and deposition of chrome during tannage, as was shown by microincineration studies.Note de contenu : - Materials and methods
- Results and discussion : Action of α-amylase on ground substance - Effect of α-amylase treatment on thickness of fresh corium split - Determination of tensile load properties of wet steerhide after α-amylase treatment - Determination of tensile load properties of wet and dry unfatliquored chrome-tanned leather after α-amylase treatment - Effect of α-amylase treatment on load to break of fatliquored dry blue leather - Microscopic investigations
- Table 1 : Effect of α-amylase treatment on the average values of load to break of wet hide specimens
- Table 2 : Effect of α-amylase treatment on the average values ofload to break of wet blueand dry blue unfatliquored leather
- Table 3 : Load to break of bacterial α-amylase treated vs. buffer treated lime/sulfide-unhaired fatliquored dry blue leather
- Table 4 : Load to break of fungal α-amylase-treated vs. buffer-treated lime/sulfide-unhaired fatliquored dry blue leather
- Table 5 : Load to break of bacterial α-amylase treated vs. fungal α-amylase treated vs. buffer treated lime/sulfide-unhaired fatliquored dry blue leather
- Table 6 : Load to break of bacterial α-amylase-treated lime/sulfide-unhaired vs. fungal α-amylase-treated lime/sulfide-unhaired vs. bacterial α-amylase-treated unlimed hair-on vs. buffer-treated lime/sulfide-unhaired dry blue fatliquored leatherEn ligne : https://drive.google.com/file/d/1lk0RPklVsLfnTFRg_ECk2AYUbnD_cN2v/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38262
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXII (Année 1977) . - p. 216-229[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008511 - Périodique Archives Documentaires Exclu du prêt Effect of histological feature of leather on acrylic resin retanning / Ying Song in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 3 (05-06/2018)
[article]
Titre : Effect of histological feature of leather on acrylic resin retanning Type de document : texte imprimé Auteurs : Ying Song, Auteur ; Yunhang Zeng, Auteur ; Bi Shi, Auteur Année de publication : 2018 Article en page(s) : p. 149-154 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acide polyacrylique
Cuirs et peaux de bovins
Cuirs et peaux de moutons
Cuirs et peaux de porcs
Peau -- Histologie
RetannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The effect of histological features of leather on acrylic resin retanning was investigated by retanning pigskin, cattle hide and sheepskin leathers with fluorescein-labelled poly(acrylic acid) (PAA). A deeper penetration and a higher uptake rate of PAA were observed in the belly area of pigskin leather compared to in its butt area. This led to a greater increase in leather thickness of the belly. As for cattle hide and sheepskin leathers whose structural difference in various parts is not obvious, the differences in penetration and uptake of PAA and increase in leather thickness between their butts and their bellies were relatively slight. These results indicated that acrylic resins penetrate and fill the thinner and looser parts of the leather more easily. This fact gives acrylic resins a good selective filling property and is helpful to level out the structure of leather. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation and analyses of AF-labelled PAA (AF-PAA) - Observation of penetration and distribution of AF-PAA in leather - Determination of uptake rate of PAA in leather - Determination of increase in leather thickness
- RESULTS AND DISCUSSION : Effect of histological features of leather on penetration and distribution of acrylic resin in leather - Effect of histological features on leather on uptake of PAA in leather - Effect of histological features of leather on increase in thickness of leatherEn ligne : https://drive.google.com/file/d/1x84FMU9IsuftPQIMVIWNwd3yh7JcqZCZ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30796
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Code-barres Cote Support Localisation Section Disponibilité 20058 - Périodique Bibliothèque principale Documentaires Disponible Effects of acrylic syntans on thermo-mechanical and swelling behaviour of chrome-tanned bovine leather - A comparative assessment / Pankaj Kumar Tyagi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 2 (03-04/2018)
[article]
Titre : Effects of acrylic syntans on thermo-mechanical and swelling behaviour of chrome-tanned bovine leather - A comparative assessment Type de document : texte imprimé Auteurs : Pankaj Kumar Tyagi, Auteur ; Pijush Kanti Chatopadhyay, Auteur ; Goutam Mukherjee, Auteur Année de publication : 2018 Article en page(s) : p. 88-98 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Cuirs et peaux -- Propriétés thermomécaniques
Cuirs et peaux de bovins
Etudes comparatives
Gonflement (physique)
Poids moléculaires
Polyacrylates
solvants
Syntans
ViscositéIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Four different samples of cow softy leather (designated CSAS0, CSAS1, CSAS2, and CSAS3) were prepared from a chrome-tanned cow wet-blue of Indien origin. CSAS0 was the control sample wherein no polyacrylate based syntan was added. OSAS1, CSAS2, and CSAS3 contain different polyacrylate based syntans (3% w/w), differing in molecular weight, in addition to the other common auxiliaries used in ail of the four samples. Other unit operations (physical and chemical) for manufacturing leather were the same in ail the samples. Thermal, mechanical, and solvent swelling behaviour of these four semples were studied and we attempted to correlate them with the cross-linking densities of the samples. The swelling behaviour was studied in five different solvents (e.g. water, toluene, xylene, methyl ethyl ketone (MEK), and acetone), assuming definite solvent-bovine collagen interaction parameters and respective cross link densities were evaluated by the Flory-Rehner equation. While studying the mechanical behaviour, some distinguished theoretical models (e.g. Mooney-Rivlin, Flory, and Martin, Roth & Stiehler (MRS)) were tried to fit with the experimental results obtained during stress-stain analyses. In this process a few constants for cow Cr-tanned leather were derived as values of constant A in MRS equation remained in the range of 0.9-1.0, and value of constant B in Flory's equation remained in the range of 0.001-0.005, which had not been reported in the literature. The experimental results showed that the polyacrylate based syntan, bearing a higher level of free acrylic acid groups or a fewer proportion of esterified acrylic acid groups, formed better cross links with chrome-tanned bovine leather in comparison to other polyacrylate based syntans containing higher proportions of esterified acrylic acid groups. Moreover, high molecular weight polyacrylate based syntans provided better thermal and solvent resistance in comparison to low molecular weight polyacrylate based syntans. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of samples - Characterization
- RESULTS AND DISCUSSION : Intrinsic viscosity and molecular weight of polyacrylate syntans - Acid value and sap value of polyacrylate syntans - Mechanical properties - TGA - Swelling - Boiling testEn ligne : https://drive.google.com/file/d/1psllywRvovg1tNTD-1OHGP15SWqc6PM1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30561
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 102, N° 2 (03-04/2018) . - p. 88-98[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19867 - Périodique Bibliothèque principale Documentaires Disponible Effects of alkali and acid on the solubility and molecular weight of collagen hydrolysates extracted from bovine hide in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 10 (10/2022)
[article]
Titre : Effects of alkali and acid on the solubility and molecular weight of collagen hydrolysates extracted from bovine hide Type de document : texte imprimé Année de publication : 2022 Article en page(s) : p. 412-421 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène
Cuirs et peaux de bovins
Hydrolysats de protéines
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.
Poids moléculaires
Solubilité
Sulfurique, AcideIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Preparation of collagen hydrolysates with high molecular weight to meet its industrial demand is a crucial step for resource utilization of solid waste of animal skins/hides. However, it is very difficult to achieve both higher molecular weight and solubility of collagen hydrolysates through the traditional methods. In this study, we attempted to prepare bovine hide collagen hydrolysates with high molecular weight and solubility through the application of NaOH or different types of acid. Influences of the concentration of alkali and acid, hydrolysis temperature and time on the molecular weight and solubility were studied, respectively. The results showed that NaOH has a strong hydrolysis effect on bovine collagen, making it a suitable candidate for the preparation of collagen hydrolysates with medium or low molecular weight. Under these optimized NaOH treatment conditions, i.e., NaOH concentration of 0.13 mol/L, hydrolysis temperature of 60 - 70°C and time of 5 h, we achieved 96% of solubility for hide pieces and the molecular weight of collagen hydrolysates were in the range of 25 - 30 kDa. By contrast, the molecular weight of the hydrolysates prepared through H2SO4 hydrolysis method was higher than that of NaOH hydrolysis method. Under the optimized H2SO4 treatment conditions, i.e. H2SO4 concentration of 0.5 mol/L, hydrolysis temperature of 50°C and time in the range of 5 - 7 h, the solubility of hide pieces reached up to 80 - 97%. Additionally, in the H2SO4 hydrolysates, the proportion of macromolecular components with molecular weight of about 100 kDa was 41 - 55% and that of medium molecular components with molecular weight of about 20 kDa was 45 - 59%. This study showed that high solubility and high molecular weight collagen products can be obtained by H2SO4 hydrolysis under specific conditions. Thus, this study provided a useful scientific method and process parameters to guide the controlling of molecular weight and the industrial application of collagen from waste on a bigger scale. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of bovine hide hydrolysates through NaOH hydrolysis method - Preparation of bovine hide hydrolysates through acid hydrolysis method - Determination of hypro by chloramine T method - Determination of molecular weight of bovine hide hydrolysates by GPC method
- RESULTS AND DISCUSSION : Effect of NaOH hydrolysis conditions on the molecular weight of collagen hydrolysate - Effect of NaOH concentration - Effect of NaOH hydrolysis time - Effect of NaOH hydrolysis temperature - Effect of acid hydrolysis conditions on the molecular weight of collagen hydrolysates - Effect of acid type - Effect of H2SO4 concentration - Effect of H2SO4 hydrolysis temperature - Effect of HSO4 hydrolysis time
- Table 1 : Conditions of hydrolysis by different acids
- Table 2 : Molecular weight of different acid hydrolyzed collagen hydrolysates
- Table 3 : Molecular weight and distribution of collagen hydrolystes with varying H2SO4 concentrations
- Table 4 : Molecular weight and distribution of collagen hydrolysates by H2SO4 hydrolysis with different H2SO hydrolysis temperature (CH2SO4 = 0.5 mol/L, 5h)
- Table 5 : Molecular weight and distribution of collagen hydrolysates by H2SO4 hydrolysis with varying time (CH2O4 = 0.5 mol.L, 50°C)DOI : https://doi.org/10.34314/jalca.v117i10.6181 En ligne : https://drive.google.com/file/d/1icwFY3afKUPxPe1ggPfep0XQmjiahBYR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38227
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Code-barres Cote Support Localisation Section Disponibilité 23652 - Périodique Bibliothèque principale Documentaires Disponible Effects of some important ectoparasites on the grain quality of cattlehide leather / A. L. Everett in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXII (Année 1977)
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