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Enzymatic removal of melamin in enzyme based dehairing and fiber opening / Punitha Velmurugan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 7 (07/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 7 (07/2008) . - p. 203-208 Titre : Enzymatic removal of melamin in enzyme based dehairing and fiber opening Type de document : texte imprimé Auteurs : Punitha Velmurugan, Auteur ; Subramani Saravanabhavan, Auteur ; P. Kannan, Auteur Année de publication : 2008 Article en page(s) : p. 203-208 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Melanin is a natural pigment of skin and hair, which provides a protective function against sunlight. The non-removal of pigments from the skin gives the finished leather a patchy appearance. As the leather industry is undergoing a paradigm shift towards bioprocessing, enzyme based dehairing and fiber opening are becoming ecologically important. However, the enzymatic dehairing and fiber opening of buffalo calfskins results in non-removal of pigments. In this study, an attempt has been made to remove the pigments from buffalo calfskins using xylanase. Xylanase is a hydrolase, which is generally used for bleaching of wood and pulps. The presence of melanin in enzymatically dehaired buffalo calfskins was identified through UV-visible spectral analysis. Preliminary trials have been carried out for removing melanin with various concentrations of xyalanse in enzymatic dehairing and fiber opening. Addition of xylanase provides and fiber opening addition of xylanase provides complete removal of melanin during enzymatic dehairing and fiber opening individually. The removal of melanin was found to be 100 %. The performance characteristics of the resultedleathers have been analyzed and found satisfactory. En ligne : https://drive.google.com/file/d/1eHi5zwtpxvqzZLjhwa6h2xotBTLVJC_3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2555 [article]

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Airborne ultrasonics for nondestructive evaluation of leather quality / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 7 (07/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 7 (07/2008) . - p. 209-214 Titre : Airborne ultrasonics for nondestructive evaluation of leather quality Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Valery F. Godinez-Azcuaga, Auteur ; Nicholas P. Latona, Auteur Année de publication : 2008 Article en page(s) : p. 209-214 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Our recent research has shown that besides Acoustic Emission (AE), Airborne Ultrasonics (AU) can also be applied for the nondestructive evaluation (NDE) of leather quality. Implementation of these methods in the manufacturing process could save a considerable amount of money, decrease the use of chemicals, reduce production time, increase the value of the leather and increase quality. Our previous paper reported a portable AE system for the evaluation of leather quality. This paper discusses the results of research carried out for nondestructive evaluation by AU. Our experiments showed that this novel technique reveals the presence of areas of different acoustic properties, which are an indication of local variations of the leather material properties. This system offers a great potential for testing entire hides in the manufacturing plant. Our research also showed that data can be gathered from different sections of the hide and along different directions with respect to the backbone. Observation also indicated these AU imaging techniques can reveal the presence of defects in the leather created by healed wounds, insect bites, knife cuts or any other physical discontinuity that could affect the leather quality. Scars, insect bites or major defects can be detected electronically, causing the hide or semi-product to be downgraded before it is subjected to any expensive leather making operations, thus saving money in processing time, chemicals, etc. AU testing showed some degree of correlation with the Nissan Shirley Stiffness data, but it is not as robust as AE with the rolling sensors. Selection of the right AU sensors is critical to achieve enough penetration in order to extract important information related to the properties of leather such as strength and softness. A better correlation between tensile strength and AU data could be achieved when AU tests are performed on a group of leather samples with the same manufacturing process and surface finish. En ligne : https://drive.google.com/file/d/1KsYc95_-Q9Rs702LP7RimaFN-D-qvd2Z/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2556 [article]

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Mechanical properties of sheep nappa leather influencing drape / K. Krishnaraj in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 7 (07/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 7 (07/2008) . - p. 215-221 Titre : Mechanical properties of sheep nappa leather influencing drape Type de document : texte imprimé Auteurs : K. Krishnaraj, Auteur ; Palanisamy Thanikaivelan, Auteur ; B. Chandrasekaran, Auteur Année de publication : 2008 Article en page(s) : p. 215-221 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir pleine fleur Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de moutons Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Understanding the performance and behavior of garment leathers provides valuable inputs for the design and fabrication of the leather apparel. Drape is one of the important properties associated with garment construction and appeal. Studies on the drape of garment leathers are scarce. In this work, drape coefficient was measured for sheep nappa leather and compared with mechanical properties, which influence the garment construction such as flexural rigidity, softness, weight, thickness, initial tensile modulus and formability. The mean drape coefficient was calculated in the range of 45 to 54% for the selected sheep nappa leathers from four different firms. Flexural rigidity, softness, weight and initial tensile modulus (across backbone direction) have been shown to have considerable influence on the drape coefficient. On the other hand, thickness and formability do not bear a significant relationship to drape coefficient. The results of this study can be used as an elementary tool for leather selection to facilitate the design and construction of apparel. En ligne : https://drive.google.com/file/d/1esFgSIBfWb85waCaCLkf-XWpG8YO1gXF/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2557 [article]

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Synergistic effect of pseudomonas aerunginosa and escherichia coli in the biodegradation of phenolic compounds / Rathinam Aravindhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 7 (07/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 7 (07/2008) . - p. 222-226 Titre : Synergistic effect of pseudomonas aerunginosa and escherichia coli in the biodegradation of phenolic compounds Type de document : texte imprimé Auteurs : Rathinam Aravindhan, Auteur ; Naveen Nagiah, Auteur ; Anand Giridhar, Auteur Année de publication : 2008 Article en page(s) : p. 222-226 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The phenolic compounds are highly toxic and its biodegradation is very important to meet the environmental regulations. In the present study a mixed culture containing Pseudomonas aeruginosa and Escherichia coli have been employed for the degradation of phenol and a phenolic syntan. A complete degradation of phenol and the phenolic syntan has been observed employing the mixed microbial culture. Possible mechanism for the phenol degradation has also been proposed. En ligne : https://drive.google.com/file/d/1NP0DYJghb62Y0FglJdP9cvNA1HDtjz6H/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2558 [article]

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