Garment leather from pigskins in WORLD LEATHER, Vol. 7, N° 2 (04-05/1994)  

[article]  inWORLD LEATHER > Vol. 7, N° 2 (04-05/1994) . - p. 43 Titre : Garment leather from pigskins Type de document : texte imprimé Année de publication : 1994 Article en page(s) : p. 43 Langues : Anglais (eng) Catégories : Chaulage Confitage Le confitage est une action biochimique effectuée au moyen de produits enzymatiques, qui a pour but de dégrader les fibres élastiques, contribuant ainsi à augmenter la souplesse du cuir. En outre, les enzymes complètent la dégradation des résidus épidermiques, donnant ainsi une fleur plus propre et plus lisse. Cuirs et peaux -- Dégraissage Cuirs et peaux -- Teinture Cuirs et peaux de porcs Neutralisation (chimie) Produits de nourriture du cuir Résistance à l'humidité:Résistance à l'eau Résistance aux huiles et graisses Tannage Vêtements en cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : During the 1980s, the consumption of leathers by the clothing sector grew annually by around 5% rising to approximately 2 billion square feet a year, representing 10-15% of the total area of leather produced. The market for these garment leathers is wide, ranging from low value articles that may be compared to cheap textile garments to high quality products with all the characteristics of presting items. These leathers are strongly represented in the fields of sports-wear and teen-clothes, where leathers are made from many types of raw materials requiring different approaches to process. Generally, garment leathers are associated with sheep, goat and bovine as raw stock, but the amount of pigskins used should not be neglected. The quantity of this raw material used in leather production is limited as not all slaughtered pigs are flayed, the skin often being retained with themeat, or used in the production of gelatin. Quality can also suffer according to the conditions in which the animal has been kept, and the conditions of slaughter strongly influence the hide characteristics. This tends to concentrate the production of leathers onto the flesh side for suedes and the manufacture of grain leathers, such as nappas or clasic nubuk is rather limited. Another peculiarity found in pigskins is the difference in structure and fibre length between the backside and neck areas, and was for a long period an obstacle to the success of pigskins in the garment field. Note de contenu : - ATTENTION TO PROCESS DETAIL : Degreasing - Liming and bating - Tanning - Neutralisation and fatliquoring - Dyeing - Oil and water resistance En ligne : https://drive.google.com/file/d/12ZLSbZAtFpZ5PkBiEqMdK2rzJ-9OXUkf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35090 [article]

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Preparation and characterization of PVOH/kaolin and PVOH/talc coating dispersion by one-step process / Vaishali Saroha in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1171-1186 Titre : Preparation and characterization of PVOH/kaolin and PVOH/talc coating dispersion by one-step process Type de document : texte imprimé Auteurs : Vaishali Saroha, Auteur ; Hina Khan, Auteur ; Sharad Raghuvanshi, Auteur ; Dharm Dutt, Auteur Année de publication : 2022 Article en page(s) : p. 1171-1186 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alcool polyvinylique Angle de contact Caractérisation Kaolin Papier -- Revêtements Papier et carton couché Perméabilité Résistance à la traction Résistance aux huiles et graisses Revêtements organiques Stabilité thermique Talc Transmission de vapeur d'humidité Index. décimale : 667.9 Revêtements et enduits Résumé : The poor barrier of cellulosic paper against water vapor and oil limits its wide application as a packaging material. Lamination, extrusion, and dispersion coating are applied on paper surface to improve barrier properties. Dispersion coating can be applied to paper surface on line during paper preparation using rod coater. In the present study, an attempt has been made to increase the process speed of coating preparation by single-step process at varying pigment concentration. Coating dispersion was applied on kraft paper using laboratory rod coated and dried in hot air oven at 80°C for 5 min. Furthermore, thermal stability, water vapor barrier properties, and grease resistance of PVOH/kaolin and PVOH/talc-coated paper were studied. Additionally, the effect of single layer and bilayer coating on paper properties was also studied. Permeability model was used to predict the orientation of pigments to the surface of paper. Viscosity of both kaolin and talc-based dispersion increased with the increase in pigment concentration. Thermal studies showed that at 600°C residual mass (%) of PVOH film increased from 0.6 to 9.89% and 15% with the addition of 25% (by weight) kaolin and talc pigment. At high pigment concentration (40–50%, by weight), the highest reduction in WVTR was observed for both the pigments. Excellent coverage of paper surface and high grease resistance was observed for all coating formulations. Our study showed that talc provides better thermal and barrier properties to coated paper than kaolin. Note de contenu : - MATERIALS AND METHODS : Materials - Coating dispersion preparation - Paper coating and film preparation - Characterization - Thermogravimetric analysis (TGA) - FESEM - WVTR - KIT test - Statistical analysis - RESULTS AND DISCUSSION : Effect of pigments on rheological properties of PVOH - X-ray diffraction (XRD) - ATR-FTIR - Thermal stability - Tensile strength - Roughness and porosity of coated paper - Contact angle - Table 1 : Characteristic parameter of kaolin in PVA/kaolin nanocomposite film - Table 2 : Crystallinity index of XRD diffractogram of composite film with respect to 101 plane reflections - Table 3 : Residual mass of PVOH, PVOH/kaolin, and PVOH/talc composite film at different temperatures - Table 4 : Roughness and porosity of uncoated and coated paper - Table 5 : Contact angle of uncoated and PVOH/kaolin and PVOH/talc-coated papers - Table 6 : Grease resistance (KIT test) of single- and double-coated paper DOI : https://doi.org/10.1007/s11998-021-00596-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00596-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38045 [article]

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