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Elasticity and setting of stretched leather / Albert M. Manich in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 2 (02/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 2 (02/2007) . - p. 43-51 Titre : Elasticity and setting of stretched leather Type de document : texte imprimé Auteurs : Albert M. Manich, Auteur ; M. de Castellar, Auteur ; B. Gonzàlez, Auteur ; M. Ussman, Auteur ; Agusti Marsal, Auteur Année de publication : 2007 Article en page(s) : p. 43-51 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The effect of stretching treatments on the balance between plasticity and elasticity of leather has been studied. Four different tanned and fatliquored bovine leathers were subjected to stretching treatments completely immersed in water. Variables of stretching were a) water temperatures between 60 and 80ºC, b) stretching ratios between 1.20 and 1.40 and c) stretching time between 10 and 20 min. Thickness and apparent density were measured. Variations in plasticity-elasticity balance induced by the stretching treatments were assessed subjecting the samples at two cycle loading-unloading test measuring the elongation induced by the maximum load in the first cycle, the Immediate Elastic Recovery, Delayed Recovery, Permanent Set and the Bedding-in Work Factor. Stretching favours the bedding-in and setting of the network of collagen fibres, increases the elasticity and decreases the plasticity of leather. When subjected to cyclic loading, straining induces additional bedding-in effect on the network of collagen fibres. Leather straining and their immediate elastic recovery and permanent set mainly depend on the applied load while delayed recovery and bedding-in is more dependent on the leather structure than on the load applied. En ligne : https://drive.google.com/file/d/1BIWCaRhEI8_t7kHW6cSzVbEKZo6J4uFY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3367 [article]

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Thermal degredation kinetics of sweat soaked cattlehide collagen fibers / K. Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 2 (02/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 2 (02/2007) . - p. 52-61 Titre : Thermal degredation kinetics of sweat soaked cattlehide collagen fibers Type de document : texte imprimé Auteurs : K. Tang, Auteur ; F. Wang, Auteur ; P. Jia, Auteur ; J. Liu, Auteur ; Q. Wang, Auteur Année de publication : 2007 Article en page(s) : p. 52-61 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper, samples of un-tanned cattlehide collagen fibers, chrome tanned cattlehide collagen fibers, and glutaraldehyde tanned cattlehide collagen fibers are prepared, and soaked in man-made sweat solutions. Studies of their thermal degradation behaviors are completed, and the factors affecting their thermal degradation behaviors are discussed. Both methods of Flynn-Wall-Ozawa and Å atava-Å esták are applied in the study of thermal degradation kinetics of these samples. The results indicate that, after being soaked in sweat for 15 days, the thermal degradation activation energies of all samples change in different degrees. Sweat-soaking process affects the thermal degradation activation energy of chrome tanned cattlehide collagen fibers the most obviously, and the chrome tanned sample is the worst in sweat resistance in the three samples studied here. The interaction between sweat and different modified cattlehide collagen fibers are discussed. En ligne : https://drive.google.com/file/d/1bpObz_5r3JdvlLhzb1IUOgykDW9QNA3A/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3368 [article]

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Antibiotics in hide preservation and bacteria control / George Stockman in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 2 (02/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 2 (02/2007) . - p. 62-67 Titre : Antibiotics in hide preservation and bacteria control Type de document : texte imprimé Auteurs : George Stockman, Auteur ; Dean Didato, Auteur ; Elton L. Hurlow, Auteur Année de publication : 2007 Article en page(s) : p. 62-67 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The use of antibiotics requires careful deliberation regarding both the criteria for their selection and the methodology of their application. Certain widely available antibiotics, including Doxycycline HCl, have demonstrated activity for short-term preservation of fresh hides. By eliminating the requirement of dry salt or brine curing, there are potential major benefits from reduced environmental burden. When used in the soak, such antibiotics may prove to be an economical alternative to conventional antimicrobials currently used for this purpose. However, evaluation of the use of clinically significant antibiotics must take into consideration other factors besides efficacy in hide preservation or bacterial protection during soaking. In particular, we must consider potential long-term risks associated with non-therapeutic applications of molecules that have been shown to be effective human antibiotics. Before adopting widespread use of clinical antibiotics in hide preservation and soaking, it would be sensible to weigh the benefits and the potential consequences of such uses in the broadest context of global health, politics, and business decision-making. This paper will explore the use of antibiotics in industry and will discuss widely differing viewpoints on the subject. The widespread use of antibiotics for promotion of the general health and growth of food-producing animals will be reviewed. Such uses account for approximately 70% of the antibiotics and other antimicrobials used in the United States and are the subject of vigorous ongoing debate. Antibiotic usage for hide preservation and soaking protection will likely undergo similar scrutiny. Clear guidance has been provided by the World Health Organization Alliance for the Prudent Use of Antibiotics. Adoption of these policies by nations around the world is occurring at a slow yet measured pace. Industrial uses of antibiotics offer obvious immediate environmental benefits, offset by possible long-term compromised viability against significant human diseases. This disparity presents members of the hide and leather industries with an interesting opportunity to test Environment, Safety and Health Policies, as well as Corporate Vision. En ligne : https://drive.google.com/file/d/1DGTlz6V8cpE8TN8kf2SpdZMf_DZa6o5i/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3369 [article]

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Effects of drying processes and fatliquoring on resiliency of leather / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 2 (02/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 2 (02/2007) . - p. 68-74 Titre : Effects of drying processes and fatliquoring on resiliency of leather Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Nicholas P. Latona, Auteur ; Peter H. Cooke Année de publication : 2007 Article en page(s) : p. 68-74 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Resiliency is the important quality characterizing the dimensional stability of leather. It expresses the ability of materials such as leather to recover from deformation after being subjected to a strain or stress. Resiliency is particularly important to automotive upholstery makers because poor recovery from deformation will create bagginess in car seats made with upholstery leather. We have designed a tensile method to characterize the resiliency of leather. Measurements showed that the resiliency of chrome-tanned leather is superior to chrome-free leather. Our studies also indicated that the physical properties of leather, particularly resiliency, were affected significantly by the drying and fatliquoring processes. Observations revealed that toggle drying may impair the resiliency of leather, while vacuum drying produced the best resilient leather in this study. In addition, data indicated that there is a close relationship between resiliency and fracture energy of leather. En ligne : https://drive.google.com/file/d/1Z1I1yZqqYX82bLSJ_EIA0BfBrDdGTtHY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3370 [article]

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