Analysis of pore-size and related parameters for leather matrix through capillary flow porosimetry technique / Venkatasubramanian Sivakumar in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 1 (01-02/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 1 (01-02/2015) . - p. 16-22 Titre : Analysis of pore-size and related parameters for leather matrix through capillary flow porosimetry technique Type de document : texte imprimé Auteurs : Venkatasubramanian Sivakumar, Auteur ; Akshaya Jena, Auteur ; Krishna Gupta, Auteur ; Asit Baran Mandal, Auteur Année de publication : 2015 Article en page(s) : p. 16-22 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : 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. Porosimétrie d'écoulement capillaire Porosité Taille des pores Tannage au chrome Tannage végétal Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather processing involves diffusion of various chemicals through the pores of skin/leather matrix. Pore-size of the matrix has significant impact on the diffusion rates of the substances involved. The determination of pore-sizes and related parameters is necessary for an understanding of the diffusion phenomena in leather processing and related techniques. There are some limitations in existing pore-size measurement techniques for natural fibrous materials like leather; hence there is a need for development of novel techniques with non-influencing character on structure of materials like leather. In this regard, a capillary flow porosimetry technique for pore-size measurement has been applied to two types of leather viz., full-chrome crust leather (FCC) and vegetable-tanned crust (VTC). By utilizing the capillary flow porosimetry technique, important pore-size parameters such as smallest, largest and mean pore-size plus porosity and average Darcy permeability have been determined. The respective values are 0.04p, 0.93p, 0.13p, 59.1% and 0.027 respectively for FCC leather and 0.04p, 0.67p, 0.11p, 49.9% and 0.021 for VTC leather. The results indicate that FCC leather has greater porosity compared to VTC leather; possibly due to chrome tanning providing less filling effect compared to vegetable tanning. Note de contenu : - LIMITATIONS OF EXISTING POROSIMETRY TECHNIQUES : Capillary flow porosimetry technique (CPF) : principle - CPF TECHNIQUES - APPLICATION OF CPF FOR DETERMINING PORE-SIZE PARAMETERS IN LEATHER MATRIX : Structure of leather - MATERIALS AND METHODS - RESULTS AND DISCUSSION : Flow rate vs. pressure - Cumulative filter flow vs. pore diameter - Pore size distribution vs. pore diameter - Number pore size distribution vs. average pore diameter - Surface area - Pore-size parameters En ligne : https://drive.google.com/file/d/1fGKd1bf8KpV_CnsPhEfuyphKtiGyq6x2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23229 [article]

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Effect of finishing auxiliaries on permeability of leathers / Murali Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 11 (11/2015)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 11 (11/2015) . - p. 372-378 Titre : Effect of finishing auxiliaries on permeability of leathers Type de document : texte imprimé Auteurs : Murali Sathish, Auteur ; Z. Mohammad Jamal Azhar, Auteur ; N. Nishad Fathima, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2015 Article en page(s) : p. 372-378 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Finition Perméabilité Polyacryliques Polyuréthanes Porosimétrie d'écoulement capillaire Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The unique fibrous arrangement and architectural marvel of collagen in skin matrix are the basis for various physical properties of leather. Air permeability is one of the unique features of skin, which makes the leather matrix superior to synthetic materials. In leather manufacturing finishing process determines the air permeability of the final leather. Therefore, knowledge of the impact of different finishing auxiliaries on the permeability of leather may helpful in selecting an appropriate finishing system for a particular type of leather. In this work, an attempt has been made to analyze the effect of various auxiliaries used in protein, acrylic and polyurethane (PU) based finish coatings on the air permeability of leather. Capillary flow porometer was used to monitor the air permeability (Flow rate cc/sec) at different pressures (psi). The results show that the effect of wax/filler/slip and dye solution on air permeability reduction is low when compared to pigment and binder. In protein and PU finishes, the binder alone and season (combination of all finishing auxiliaries like pigment, binder, and other auxiliaries) has a strong influence on permeability reduction whereas in case of an acrylic based finish, the pigment and binder plays an important role in permeability reduction. Leather coated solely with protein binder shows minimal permeability reduction than compared to leather coated with acrylic or polyurethane binders, whereas in season, acrylic based finishing has a lower permeability profile than that of protein and PU. In that case the permeability profile of protein and PU season coated leathers is almost similar. Note de contenu : - MATERIALS AND METHODS : Permeability measurements - Measurement of film thickness - RESULTS AND DISCUSSION : Selection of uniformly permeable samples - Protein finishing - Resin finishing - PU finishing - Protein vs resin vs PU finishing En ligne : https://drive.google.com/file/d/11zE9nCljBG7eV_x7o-7Esb1m1IbAUW8Z/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24869 [article]

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