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Evaluation of leather handle character by discriminatory two class analysis / Zhang Xiao-Lei in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 5 (09-10/2007)
[article]
Titre : Evaluation of leather handle character by discriminatory two class analysis Type de document : texte imprimé Auteurs : Zhang Xiao-Lei, Auteur ; Liu Qing-Lan, Auteur ; Zhang Wei-Ping, Auteur Année de publication : 2007 Article en page(s) : p. 201-207 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir
Cuirs et peaux -- Propriétés mécaniques
Douceur (toucher)
Matériau plein
Poignée en cuir
Statistique
ToucherIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The hand evaluation method has been used to characterize the handle of leather (softness, fullness and elasticity) for many years. However, there is a certain subjective element affecting the final result. It would be valuable to set up a scientific theory and find a parameterized objective test method for leather handle character. In this paper, research results were analyzed to determine whether there was a interrelation between the handle character (softness, fullness and elasticity) and mechanical parameters measured at specific technical states.
Softness can be characterized by bending coefficient (Kb) ; fullness can be characterized by compression index (Kc); stretchability by lastometer coefficient (K1) and elasticity by bending stress relaxation attenuation constant (αb) and bending stress attenuation (K). The statistical method of discriminatory two class analysis (DATC) was there adopted to characterize the handle of leather. The corresponding experiment and the application of DATC in the evaluation of leather handle character was carried out and the DATC results were found to be significant at a level greater than 99%. The findings indicate that the DATC method can be regarded as a comprehensive analysis method to, objectively and correctly, characterize the handle of leather.Note de contenu : - Interrelated research : Compressibility of leather - Bending property of leather - Lastometer property of leather
- The scientific evaluation of leather handle : Evaluation of leather character - Discriminatory analysis of two classes - The application of DATC in the evaluation of leather handle character - Determination of standard samples - The specific examples of standard samples
- Contrast between the results of the discriminatory analysis and HEM :
- Table 1 : Instrumentally measured mechanical properties of the samples
- Table 2 : The results of DATC
- Table 3 : The variable parameters of the standard samples
- Table 4 : The analysis results of the standard samples
- Table 5 : The contrasting results of DATC and HEMEn ligne : https://drive.google.com/file/d/1pCyU16SZsC5C1zqibitDvukXFlIl-ckY/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39013
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 91, N° 5 (09-10/2007) . - p. 201-207[article]Evaluation of a mixture of castor oil and polyvinylpyrrolidone for the lubrication of dry / Gomaa Abdel-Maksoud in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 1 (01-02/2022)
[article]
Titre : Evaluation of a mixture of castor oil and polyvinylpyrrolidone for the lubrication of dry Type de document : texte imprimé Auteurs : Gomaa Abdel-Maksoud, Auteur ; Nareman Mahmoud Hussien, Auteur ; Nadeen Al-Arif, Auteur ; Asmaa Gouda, Auteur ; Wael S. Mohamed, Auteur ; Medhat Ibrahim, Auteur Année de publication : 2022 Article en page(s) : p. 20-31 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie analytique
Cuirs et peaux -- Propriétés mécaniques
Evaluation
Huile de ricin et constituants
Mélanges (chimie)
Polyvinylpyrrolidone
Produits de nourriture du cuirIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Leather artifacts are to be found in varied archaeological and historical places (museums, storages, libraries, excavation areas). Improper environmental conditions (such as relative humidity, temperature, excess light, pollution etc.) and poor handling can affect such artifacts and lead to their increased hardness and dryness. This study aims to evaluate castor oil and polyvinylpyrrolidone (PVP) as individual materials and as a mixture at different concentrations for the lubrication of vegetable-tanned leathers. Accelerated heat ageing at different temperatures was used.
The analytical techniques used for the evaluation process were digital light microscopy, scanning electron microscope (SEM), change of colour, attenuated total reflection - Fourier transform infrared spectroscopy (ATR-FTIR), and mechanical properties (tensile strength and elongation). Investigation of the surface morphology by microscopy proved that a low concentration of castor oil in the mixture gave good fibre distribution and the grain surface pattern was established for the treated and aged treated samples. The colour value and total colour difference of the treated and aged treated samples with a low concentration of castor oil were better than at a high concentration. ATR-FTIR proved that the castor oil and PVP mixture protects leather from deterioration as no free radicals were observed in the spectra. Mechanical property values proved that the use of the lubricant protected leather from accelerated heat ageing. It is recommended that, a mixture of castor oil and PVP with a ratio of 10:90 could be applied for the lubrication of dry vegetable-tanned leather artifacts.Note de contenu : - MATERIALS AND METHODS : Materials - Methods
- RESULTS AND DISCUSSION : Digital light microscope investigation - Investigation of the surface morphology by SEM - Measurement of colour change - ATR-FTIR analysis of the treated leather with the mixture of castor oil and PVP - Measurement of mechanical properties (tensile strength and elongation)
- Table 1 : Change of colour of vegetable-tanned leather samples treated with the mixture of castor oit and polyvinyl pyrrolidone before and after accelerated heat ageing
- Table 2 : Tensile strength and elongation of vegetable-tanned leather samples treated with the mixture of castor oil and polyvinylpyrrolidone at different concentrations before and after accelerated heat ageingEn ligne : https://drive.google.com/file/d/1e9xcGT62rjdFLdc7QkeAc98_0_EYUg-W/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36969
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 1 (01-02/2022) . - p. 20-31[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23210 - Périodique Bibliothèque principale Documentaires Disponible Evaluation of the physical properties of goatskins tanned using banana (Musa spp.) leaf midrib tannins / James K. Wangui in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 1 (01/2024)
[article]
Titre : Evaluation of the physical properties of goatskins tanned using banana (Musa spp.) leaf midrib tannins Type de document : texte imprimé Auteurs : James K. Wangui, Auteur ; Benson Ongorora, Auteur ; Douglas Onyancha, Auteur Année de publication : 2024 Article en page(s) : p. 13-19 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bananier et constituants
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés physiques
Cuirs et peaux de chèvres
Mimosa et constituants
Tannage végétal
Température de retraitIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Vegetable tannins have been studied over the years with an aim to reduce the pollution load caused by chrome tanning. Although mimosa tannins have been utilized commercially, they are expensive and not readily available. The purpose of this study was to assess the physical properties of leather tanned with banana leaf midribs tannins in order to determine their suitability as vegetable tannins. Selected banana leaf midrib samples were collected from Gikondi village in Mukurweini, Nyeri County, Kenya. They were shade-dried and ground into powder. The skins were processed conventionally using banana leaf midribs tannins of Musa sapientum Linn. and ‘Muraru’ (AA genome), with mimosa as a control. The physical properties of the resultant leathers were determined following the standard IUP methods. It was found that Musa sapenitum Linn, ‘Muraru’ (AA genome) and mimosa-tanned leathers had average shrinkage temperatures of 80.33 ± 0.74°C, 78.67 ± 0.47°C and 81.67 ± 0.94°C, respectively. The properties of the tanned leathers were compared with those of the control-tanned leather. Assessment of the physical properties indicated that the leathers met the minimum recommended values safe for Musa sapentium Linn-tanned leather, which failed at 30,000 flexes. These results indicate that banana leaf midribs can be used as an organic tanning agent source for production of leathers from goatskins. Note de contenu : - EXPERIMENTAL : Materials - Tanning process
- PHYSICAL TESTING : Sampling and sample preparation- Determination of shrinkage temperature - Mechanical analysis of the tanned leathers
- RESULTS AND DISCUSSION : Tanning - Physical properties of the tanned leathers - Shrinkage temperature - Tensile strength - Tear strength
- Table 1 : Process recipe for Mimosa tanning
- Table 2 : Process recipe for banana leaf midrib tanning
- Table 3 : Physical properties of selected banana leaf midrib tanned leathers and mimosa tanned leather - Grain crack and ball burst - Flexing enduranceDOI : https://doi.org/10.34314/jalca.v119i1.8290 En ligne : https://drive.google.com/file/d/1CRhkpRovl3M5V4rZjc83y9rKE9FjEEaH/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40345
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 1 (01/2024) . - p. 13-19[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24402 - Périodique Bibliothèque principale Documentaires Disponible Evaluation of wax or oil fungicide formulations for preservation of vegetable-tanned leather artifacts / Gomaa Abdel-Maksoud in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 2 (03-04/2006)
[article]
Titre : Evaluation of wax or oil fungicide formulations for preservation of vegetable-tanned leather artifacts Type de document : texte imprimé Auteurs : Gomaa Abdel-Maksoud, Auteur Année de publication : 2006 Article en page(s) : p. 58-67 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cires
Cuirs et peaux -- Propriétés mécaniques
Essais accélérés (technologie)
Evaluation visuelle
Fongicides
Formulation (Génie chimique)
Huiles et graisses
Surfaces -- Analyse
Tannage végétalIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The environmental conditions in Egypt are very different from the conditions required by international standards for storage rooms, display cases etc. These conditions make vegetable-tanned leather artifacts dry, brittle, stiff and weak. Leather artifacts need conservation treatment with lubrication materials from time to time. Although lubrication of leather may in fact be the most viable way of protecting leather in Egyptian collections, such dressings have been avoided, because the use of oils would promote mould growth. This study aims at adding fungicide to wax or oil formulations to control fungal growth and to improve the properties of leather.
Vegetable-tanned leather was treated with oil or wax formulations without and with fungicides. Untreated and treated samples were innoculated with 4 fungal strains (Aspergillus niger, Penicillium funiculosum, Alternaria alternata and Trichoderma viride) which are commonly found in archaeological vegetable-tanned leather artifacts. The samples were assessed visually and by mechanical tests (tensile strength and elongation) plus an investigation of the surface morphology by SEM.
The results showed that vegetable-tanned leather samples treated with lubricants containing fungicides were more resistant to mould infection than the blank samples. However, samples treated with lubricants without fungicide were more resistant than the control sample that had not been treated at all. The index method, which is proposed by the author for the evaluation of mechanical tests is a good tool and can be used to evaluate other properties.Note de contenu : - MATERIALS AND METHODS : New vegetable-tanned leather samples - Fungicides used - Lubricant compounds used - Incorporation of fungicides with oil or wax formulations - Application technique of Lubricants - without and with fungicides - Fungal strains - Innoculation of vegetable tanned leather with fungi - Accelerated ageing of the samples
- EVALUATION METHODS : Visual assessment - Mechanical properties (tensile strength and elongation) - Index method for the evaluation of mechanical properties - Investigation of the surface morphology by a scanning electron microscope (SEM)
- RESULTS AND DISCUSSION : Visual assessment - Mechanical properties - Investigation of the surface morphologyEn ligne : https://drive.google.com/file/d/103DHjczTslWkI3nNiyh1Ms3MEZlEThdP/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39158
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 90, N° 2 (03-04/2006) . - p. 58-67[article]Expériences avec le développement de la technologie sur la fabrication du box de qualité à partir des peaux des veaux nourris artificiellement / V. Pektor in REVUE TECHNIQUE DES INDUSTRIES DU CUIR, Vol. LXIV (Année 1972)
[article]
Titre : Expériences avec le développement de la technologie sur la fabrication du box de qualité à partir des peaux des veaux nourris artificiellement Type de document : texte imprimé Auteurs : V. Pektor, Auteur ; P. Smykal, Auteur ; B. Juva, Auteur Année de publication : 1972 Article en page(s) : p. 106-117 Note générale : Bibliogr. Langues : Français (fre) Catégories : Animaux -- Alimentation
Cuir box
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux de veaux
PelanageUne des opérations préparant au tannage. La travail de préparation au tannage comprend six opérations essentielles : la trempe ou reverdissage, l'épilage, le pelanage, l'ébourrage, l'écharnage et le déchaulage. Le pelanage consiste en la préparation du derme à l'absorption du tanin par transformation du collagène. On écrit aussi planage, plainage.
Tannage
Travail de rivière (cuir)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Depuis ces dernières années, le poids du bétail aux abattoirs s'accroît sensiblement. L'augmentation du poids moyen n'est plus aujourd'hui un privilège de gros bovins, mais l'intérêt de l'éleveur pénètre aussi dans le domaine de l'élevage de veaux. On offre aux tanneries un nouveau type de peaux brutes, désignées sommairement comme des peaux de veaux nourris artificiellement. Note de contenu : - Le mode de classement
- Le mode d'affouragement, les types de nourriture artificielle
- LE TRAITEMENT DE PEAUX EN BOX : L'état actuel de la technologie, la qualité du cuir fini - Les systèmes de pelanage, les types différents de produits, le contrôle du procédé, la qualité du cuir - Les influences du tannage - Discussion des résultats obtenus - Les changements technologiques principaux dans l'atelier de travail (de la trempe au tannage) au cours du traitement des peaux provenantes des veaux nourris artificiellement
- CONCLUSION : Une récapitulation des résultats du point de vue du procédé et des effets obtenus - Aperçu critique des résultats obtenus. Stipulation d'autres domaines à examiner
- Tableau 1 : Evaluation analytique du pelanage avec le pelain combiné - Ca(OH) + Na S fondu Flotte 200 %, durée du pelanage 24 heures
- Tableau 2 : Evaluation analytique du pelanage avec le pelain combiné - Ca(OH) + Na2 (Na2S) S fondu + NaHS. Flotte 200 %, durée du pelanage 24 heures
- Tableau 3 : Influence de la température sur les valeurs analytiques du pelain combiné - Na2 (Na2s) S fondu + NaHS
- Tableau 4 : Mesure du lisse de la surface du cuir
- Tableau 5 : Résultats des examens - valeurs physico-mécaniquesEn ligne : https://drive.google.com/file/d/1vIe3D3LFXKzZy6uZCJkINmmTVc7e6_iR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36726
in REVUE TECHNIQUE DES INDUSTRIES DU CUIR > Vol. LXIV (Année 1972) . - p. 106-117[article]Réservation
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