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Auteur Nicholas P. Latona
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Eastern Regional Research Center - Wyndmoor - PA - United States
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Environmental effects on chrome-free leather / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 10 (10/2006)
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Titre : Environmental effects on chrome-free leather Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Nicholas P. Latona, Auteur ; Richard Ashby, Auteur ; Keyi Ding, Auteur Année de publication : 2006 Article en page(s) : p. 368-375 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Chrome-free leather has gradually gained commercial importance, particularly for automobile upholstery applications. In many respects, however, chrome-free leather is inferior to chrome-tanned leather. UV and heat are known to be more detrimental to chrome-free leather than to chrome-tanned leather, especially in regard to the colorfastness of dyestuff and mechanical properties. Temperature, UV radiation, and humidity are key environmental factors that affect leather properties. The role of humidity and its interaction with UV radiation and temperature on leather properties, however, are not clear to the leather industry, and this information is needed for formulation of antioxidants that will protect chrome-free leather from UV and heat damage. Therefore, a systematic study was performed to formulate the relationship between these three environmental variables and resultant colorfastness and mechanical properties. A second order regression equation was derived to plot response surfaces that clearly illustrate the relationship between the environmental variables and colorfastness, as well as the resultant physical properties. Observations showed an intriguing interaction between humidity and radiation dosage. Measurements revealed that an increase in humidity resulted in a decrease in colorfastness and mechanical strength. However, after the UV radiation dosage reaches a certain level, an increase in humidity may actually help maintain both properties. Observation showed the stiffness decreased steadily with humidity, whereas the toughness index slightly increased with humidity. This study also used differential scanning calorimetry (DSC) to determine the denaturation temperature as a function of various environmental conditions. We observed a correlation between colorfastness and the denaturation temperature. En ligne : https://drive.google.com/file/d/1YrimELoNqwkDh2OJ98D14sqdial4H1DM/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3975
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Code-barres Cote Support Localisation Section Disponibilité 005680 - Périodique Bibliothèque principale Documentaires Disponible Enzymatic modification of hydrolysis products from collagen using a microbial transglutaminase. II. Preparation of films / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 6 (06/2002)
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Titre : Enzymatic modification of hydrolysis products from collagen using a microbial transglutaminase. II. Preparation of films Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; Cheng-Kung Liu, Auteur ; Nicholas P. Latona, Auteur ; William N. Marmer, Auteur ; Eleanor M. Brown, Auteur Année de publication : 2002 Article en page(s) : p. 225-234 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The use of renewable resources in the production of goods traditionally made from petroleum products has recently gained increasing research interest. Environmental concerns, such as biodegradability and ever increasing landfill fees, could be allayed by use of these products. During the conversion of hides and skins into leather, a high percentage of the original collagen substrate becomes waste. This waste has potential for recycling into useful products. Historically, gelatins (a collagen by-product) have been modified chemically, and the physical properties of these products have been improved. However, because of cost and the toxicity issues associated with some crosslinking chemicals, enzymatically modified products would be highly desirable. Commercial gelatins were treated enzymatically with a microbial transglutaminase, mixed with glycerol as plasticizer, and films were prepared. It was found that the amount of glycerol added affected the mechanical properties, particularly the maximum strain. Increasing the concentration of cross-linking agent gave products with higher tensile strengths that were less soluble in water and had improved water absorption properties. The products resulting from these studies have implications not only in the preparation of edible films and sausage casings, but also in the packaging material market, a market not previously utilized because of poor mechanical properties of gelatin films. En ligne : https://drive.google.com/file/d/1su4LsTGTT8SqZfWaqGbeArqyVz3oJwhB/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4291
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Code-barres Cote Support Localisation Section Disponibilité 001575 - Périodique Bibliothèque principale Documentaires Disponible Evaluation of hides, wet blue and leather using airborne ultrasonics / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 4 (04/2013)
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Titre : Evaluation of hides, wet blue and leather using airborne ultrasonics Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Nicholas P. Latona, Auteur ; Seung-Chul Yoon, Auteur Année de publication : 2013 Article en page(s) : p. 128-138 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Contrôle non destructif
Cuir
Détection de défauts (Ingénierie)
Evaluation
Ultrasons
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Animal hides are important agricultural commodities closely associated with rural economics and the well being of rural farmers in the United States. Approximately 90% of the hides produced in the United States are being exported; the remaining 10% are mostly tanned into leather. At the present time hides and leather are visually inspected and ranked for quality, usable area, and sale price. However, visual inspection is not reliable for detecting defects, which are usually hidden inside the material or under the hair in fresh hides. This manual assessment is not uniform among operators, and often leads to disputes over fair price. Development of a non-contact nondestructive method to accurately evaluate the quality of hides and leather is urgently needed. We previously reported the research results for airborne ultrasonic (AU) testing using non-contact transducers to evaluate the quality of hides and leather. We demonstrated the ability of AU to reveal defects in hides and leather that are difficult to be found during visual inspection. In this paper, we present new results on AU inspection, particularly using a statistical data/cluster analysis technique, in which leather and hide defects are depicted as color-coded amplitude maps, or “C-scans.” En ligne : https://drive.google.com/file/d/1h39H1bn18xopLwu9IZKZ4Ewnqu4VQ7R6/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18088
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Code-barres Cote Support Localisation Section Disponibilité 14980 - Périodique Bibliothèque principale Documentaires Disponible Glutaraldehyde-tanned leather treated with tocopherol / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 3 (03/2005)
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Titre : Glutaraldehyde-tanned leather treated with tocopherol Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Joseph Lee, Auteur ; Nicholas P. Latona, Auteur Année de publication : 2005 Article en page(s) : p. 102-110 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Non-chrome-tanned (chrome-free) leather has gradually gained commercial importance, particularly for automobile upholstery applications. UV and heat resistance are very important qualities for automobile applications. We developed an environmentally friendly finishing process that will improve the UV- and heat resistance of automobile upholstery leather. Tocopherol (Vitamin E) is a potent free radical scavenger and highly protective agent for collagen fibers against UV damage. We previously reported that the application of tocopherol to the grain layer of chrome-tanned leather improved its durability. The current study focuses on non-chrome-tanned leather made with a glutaraldehyde tanning process. We applied tocopherol to the grain layer of that leather and also studied the addition of tocopherol to the fatliquoring drums. Following exposure in a Fade-Ometer, the treated samples were evaluated by colorimetry and mechanical testing for the efficacy of UV- and heat resistance. A polarizing microscope equipped with a Berek compensator was employed to determine the birefringence of the untreated and treated leather collagen fibers to determine the treatment effects on the degree of orientation. Data showed that leather coated with tocopherol exhibited significant improvement in tensile strength retention and color fading resistance against UV radiation and heat. Leather fatliquored with tocopherol, however, did not show a similar improvement. En ligne : https://drive.google.com/file/d/1Dqep6eR5_6KlwhNgqN6P1khbKZPqGh8S/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4073
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Code-barres Cote Support Localisation Section Disponibilité 001032 - Périodique Bibliothèque principale Documentaires Disponible Leather coated with mixtures of humectant and antioxidants to improve ultraviolet and heat resistance / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 5 (05/2009)
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Titre : Leather coated with mixtures of humectant and antioxidants to improve ultraviolet and heat resistance Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Renée J. Latona, Auteur ; Nicholas P. Latona, Auteur ; Mila Aldema-Ramos, Auteur Année de publication : 2009 Article en page(s) : p. 161-168 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Ultraviolet (UV) and heat resistance are very important qualities for leather products. We recently developed an environmentally friendly finishing process for improving the UV- and heat resistance of chrome-free leather. We previously reported and demonstrated some promising results from coating tocopherol, a natural antioxidant, onto the grain layer of leather. Tocopherol (Vitamin E) is a potent free radical scavenger and highly protective agent for collagen fibers against UV damage. This antioxidant has improved the UV- and heat resistance of the leather product. To help prevent over-drying, glycerol, a humectant, is added to tocopherol to not only maintain proper moisture content, but also to improve the UV and heat resistance of leather. The mixture of glycerol and tocopherol is applied as an emulsion with sodium dodecyl sulfate (SDS), as an emulsifying agent and coated the grain layer of that leather. Following exposure in a Fade-ometer, the treated samples were evaluated by colorimetric and mechanical testing for the efficacy of UV- and heat resistance. Data showed that leather coated with glycerol/tocopherol exhibited significant improvement in color fading resistance against UV radiation and heat. En ligne : https://drive.google.com/file/d/1Qg8OOonUTzHNM5WLOs4yntnYoXvO7Of-/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5217
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Code-barres Cote Support Localisation Section Disponibilité 011294 - Périodique Bibliothèque principale Documentaires Disponible Limiting microbial activity as an alternative approach of bovine hide preservation part II : impact of developed formulations on leather quality and the environment / Majher I. Sarker in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 2 (02/2020)
PermalinkLubrication of leather with mixtures of polyethylene glycol and oil / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 4 (04/2006)
PermalinkLubrication of leather with polyethylene glycol / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 9 (09/2002)
PermalinkMicroscopic observations of leather looseness and its effects on mechanical properties / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 7 (07/2009)
PermalinkMilling effects on mechanical behaviors of leather / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 6 (06/2007)
PermalinkNew acoustic methods for nondestructive evaluation of leather quality / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 3 (03/2008)
PermalinkNondestructive evaluation of leather based on acoustic emission / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 6 (06/2004)
PermalinkNondestructive testing using rotational acoustic emission sensors / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 11 (11/2005)
PermalinkPhysical property studies for leather lubricated with various types of fatliquors / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 11 (11/2002)
PermalinkPolymeric coatings containing antioxydants to improve UV and heat resistance of chrome-free leather / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 6 (06/2008)
PermalinkPreparation and characterization of gelatin/chitosan/carbodiimide Films / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 12 (12/2017)
PermalinkPreparation of biobased sponges from up-tanned hides / Aisha Siddique in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 5 (05/2016)
PermalinkPreservation of bovine hide using less salt with low concentration of antiseptic, Part II : Impact of developed formulations on leather quality and the environment / Majher I. Sarker in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 10 (10/2018)
PermalinkReaction of gelatin and chitosan with water soluble carbodiimides / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 2 (02/2017)
PermalinkStaking and its interaction with fatliquoring on vacuum-dried leather / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 9 (09/2002)
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