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Auteur Cheng-Kung Liu
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United States Department of Agriculture, Agricultural Research Service Eastern Regional Research Center - Mermaid Lane, Wyndmoor, PA - USA
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Mechanism of collagen processed with urea determined by thermal degradation analysis / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 10 (10/2020)
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Titre : Mechanism of collagen processed with urea determined by thermal degradation analysis Type de document : texte imprimé Auteurs : Keyong Tang, Auteur ; Weilin Li, Auteur ; Jie Liu, Auteur ; Cheng-Kung Liu, Auteur ; Hongbo Pan, Auteur Année de publication : 2020 Article en page(s) : p. 380-389 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène
Collagène -- Détérioration
Cuir nappa
PyrolyseLa pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation.
Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente.
UréeIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : During the beamhouse process for nappa leather, pelts are usually limed with amino compounds such as urea, ethylenediamine, and triethanolamine. However, the interaction between amino compounds and collagen is not well known. In this work, collagen fibers were soaked in various concentrations of urea and the thermal degradation of collagen fibers were studied by the methods Horowitz-Metzger and Coats-Redfern. The mechanism of the reaction between urea and collagen fibers is discussed, wherein the thermal degradation activation energy first decreases and then increases. The lowest thermal degradation activation energy of urea processed collagen appears at 2-3 mol/L urea, suggesting that the stability of collagen is the poorest when the pelt is processed in the urea solution. At the urea concentration above 6 mol/L, the thermal degradation activation energy of the sample is similar to samples without urea processing and the higher concentrations does not have the same effect as lower concentrations of urea. The collagen fibers with a urea processing history were washed to remove the urea in them, and the samples were studied again for their thermal degradation behavior. The results indicated that the thermal degradation activation energy of the collagen fibers might recover to the unprocessed level. Therefore, it was suggested that the reaction between urea molecules and collagen fibers is reversible. Urea molecules might help to destroy some of the hydrogen bonds between collagen peptides in the urea solution. After the urea is washed out, the structure of the collagen will return to its original state, because the hydrogen bonds might be reconstructed. Note de contenu : - EXPERIMENTAL : Materials and apparatus - Preparation of urea solutions - Preparation of different CCFs - TG/DTG analysis and data processing
- RESULTS AND DISCUSSION : Thermal degradation behaviors of urea processed collagen fibers - Influence of water washing on the urea-processed CCFsDOI : https://doi.org/10.34314/jalca.v115i10.4172 En ligne : https://drive.google.com/file/d/1nmmnQ02Lho0CulCfzsKaRlV-3YIetnwB/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34613
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Code-barres Cote Support Localisation Section Disponibilité 22361 - Périodique Bibliothèque principale Documentaires Disponible A method for removing adobe-type manure from hides using an oxidizing agent / Ryan M. Marsico in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 3 (03/2017)
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Titre : A method for removing adobe-type manure from hides using an oxidizing agent Type de document : texte imprimé Auteurs : Ryan M. Marsico, Auteur ; Cheng-Kung Liu, Auteur Année de publication : 2017 Article en page(s) : p. 88-93 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bovins -- Fumier
Cuirs et peaux -- Propriétés mécaniques
Fourier, Spectroscopie infrarouge à transformée de
Hydroxyde de sodiumL'hydroxyde de sodium, appelé également soude caustique7, est un corps chimique composé minéral de formule chimique NaOH, qui est à température ambiante un solide ionique. Fusible vers 318 °C, il se présente généralement sous forme de pastilles, de paillettes ou de billes blanches ou d'aspect translucide, corrosives et très hygroscopiques. Il est très soluble dans l'eau et légèrement soluble dans l'éthanol.
La solution d'hydroxyde de sodium, souvent appelée soude, est une solution aqueuse transparente. Concentrée, elle est corrosive et souvent appelée lessive de soude.
Les propriétés chimiques de l'hydroxyde de sodium sont surtout liées à l'ion hydroxyde HO- qui est une base forte. En outre, l'hydroxyde de sodium réagit avec le dioxyde de carbone (CO2) de l'air et se carbonate.
La solubilité de la soude caustique dans l'eau augmente avec la température, à pression constante ou ambiante.
Microscopie électronique à balayage
Peaux brutes -- Nettoyage
Percarbonate de sodium
Salissures biologiques
Tannage
Tannage végétalIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Adobe-type (hardened) manure attached to bovine hair is a major source of meat contamination, hide quality deterioration, and devalued leather products. Therefore, it is important to develop cleaning solutions that can rapidly remove adobe-type manure to improve the quality of hides delivered to tanners for leather processing. Oxidative chemicals such as sodium percarbonate (SPC) have been used as an environmentally friendly alternative to dehair bovine hides in 1-4 hours. In this study, we do not aim to dehair the hide with SPC, but to weaken and shorten the hair enough to remove the adobe-type manure from the hide in under 30 minutes. Our formula substantially removed adobe-type manure in less than 30 minutes using a combination of SPC and sodium hydroxide (NaOH) as a soaking solution in a tumbling drum. Fourier Transform Infrared (FTIR) spectroscopy showed the oxidation of cystine disulfide bridges in keratin, the structural protein of hair, indicating that our formula weakened the hair after treatment. A decrease in hair diameter, or hair shortening, was also observed with Scanning Electron Microscopy (SEM) analysis after treatment of the hides with our formula. Our environmentally friendly formula for oxidatively removing adobe-type manure is a viable option to enhance both meat and hide quality. Note de contenu : - Materials - Oxidative manure removal treatment
- Tanning and mechanical properties
- Hair integrity (FTIR and SEM analysis)En ligne : https://drive.google.com/file/d/15v3bd1hi5QBLe5CpMToZGbkNXKrvjDV8/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27980
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Code-barres Cote Support Localisation Section Disponibilité 18734 - Périodique Bibliothèque principale Documentaires Disponible Microscopic 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)
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Titre : Microscopic observations of leather looseness and its effects on mechanical properties Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Peter H. Cooke, Auteur ; Joseph Lee, Auteur ; Nicholas P. Latona, Auteur Année de publication : 2009 Article en page(s) : p. 230-236 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Looseness is a very troublesome issue regarding the structure of leather as well as the final leather product. It is a great concern to tanners who will go to great lengths to address it by adding different chemicals. However, its fine structure and effects on the mechanical properties are not fully understood. This investigation was devoted to gaining a better understanding of looseness based on microscopic studies showed visible gap between the interstitial layer and the corium layer in the loose leather. Moreover, the grain showed looseness leads to a decrease in toughness. However, measurements also showed there is little change in tensil strength and elongation. Moreover, viscoelasticity studies showed that loose leather has very similar stress relaxation curves as tight leather. Both leathers demonstrated a rapid decrease in stress for the first few seconds followed by a much slower decay thereafter. The loose leather, nevertheless, has a greater initial stress than the tight leather, indicating a higher stifness than tight leather. This study has provided a better understanding of loosenes, which will lead to the development of measures to correct this defect such as adding fillers to the leather. En ligne : https://drive.google.com/file/d/1rpVsSCRt8PaOTqzPuVa20pSVwplf5Wib/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5981
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Code-barres Cote Support Localisation Section Disponibilité 011463 - Périodique Bibliothèque principale Documentaires Disponible Milling effects on mechanical behaviors of leather / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 6 (06/2007)
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Titre : Milling effects on mechanical behaviors of leather Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Peter H. Cooke, Auteur ; Gary L. DiMaio, Auteur ; Nicholas P. Latona, Auteur Année de publication : 2007 Article en page(s) : p. 191-197 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Milling is a key process to soften leather for adequate compliance. It is, however, still not well understood for its effects on leather structure and mechanical properties. To consistently produce high quality leather, it is essential that the tanner understands the impact and effects of every mechanical operation in the leather-making process. This investigation is devoted to gaining a better understanding of milling effects on pliability and other properties of concern to the leather industry, such as mechanical strength and toughness. Observation showed milling leads to a decrease in Young’s modulus, consequently an improved compliance and softness. Data also showed, however, there is little change in tensile strength and toughness. Moreover, leather products in service are constantly being stretched. For understanding the mechanical behavior of leather products under cyclic stretching, we measured the energy loss (hysteresis) during cyclic tensile tests using an advanced computing program. Data showed that hysteresis is the greatest for the first cycle, thereafter, the rest of hysteresis values are relatively unchanged. We also discovered that drum milling significantly decreases the hysteresis. This implies that a structural change occurs during milling, resulting in a removal of the residual stress that was introduced during the leather making process. En ligne : https://drive.google.com/file/d/1SW0b2RIeWyxO0Ig19lOEsDx3R4En133Q/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3353
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Code-barres Cote Support Localisation Section Disponibilité 007401 - Périodique Bibliothèque principale Documentaires Disponible New 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)
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Titre : New acoustic methods for nondestructive evaluation of leather quality Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Nicholas P. Latona, Auteur Année de publication : 2008 Article en page(s) : p. 94 - 102 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Currently, there is no on-line test method to monitor the physical properties of semi-products such as wet blue or crust during the leather-making processes. Inferior leather semi-products, such as wet blue, cannot be downgraded earlier or removed before going through many expensive processes (including retanning, fatliquoring, dyeing, drying, staking, milling and finishing). Therefore, developing a nondestructive tester to perform on-line testing of the physical properties of semi-products is very desirable. Recently ARS transferred its knowledge gained over the years to Physical Acoustics Corporation (PAC) and collaborated with the leather industry in order to produce an on-line nondestructive acoustic emission tester. This paper discusses the activities performed by PAC, ARS, and Seton Company during the Small Business Innovative Research (SBIR) Phase I project ¿Acoustic Emission for the Characterization of Leather.¿ The main objective of this project was to demonstrate the feasibility of using AE and Airborne UT to assess, characterize, and classify the quality level of various types of leather. The results obtained in this project show that it is feasible to use AE for the evaluation of leather quality during the manufacturing process. A newly designed AE system for the evaluation of leather quality is discussed in this paper. This system, which combines a handheld AE instrument with a rolling sensor probe, offers the potential for testing entire hides in the manufacturing plant. Data could be gathered from different sections of the hide, along different directions with respect to the backbone, and during different stages in the manufacturing process. Finally, we reported a simple method using a mechanical stopwatch as an acoustic wave source. Hits rate were collected when sound traveled though the leather samples. Results show a strong correlation between tensile strength and cumulative hits. En ligne : https://drive.google.com/file/d/1Q1RgHbXfeSuf10r5bwbPD3ljYa5Vm2d_/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2577
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Code-barres Cote Support Localisation Section Disponibilité 009925 - Périodique Bibliothèque principale Documentaires Disponible Nondestructive 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)
PermalinkA novel approach of removing externally attached debris from animal carcass to ensure meat safety and byproduct quality / Majher I. Sarker in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 3 (03/2022)
PermalinkA novel system of removing décorin, a minor proteoglycan of bovine hides, to improve the quality of leather / Mila Aldema-Ramos in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 7 (07/2010)
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 and characterization of polyphenol-modified gelatin products / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 2 (02/2012)
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 I : effectiveness of developed formulations / Majher I. Sarker in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 1 (01/2018)
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)
PermalinkReaction of protein and carbohydrates with EDC for making unique biomaterials / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 4 (04/2016)
PermalinkSoaking formulations that can soften hardened bovine manure / Mila Aldema-Ramos in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 7 (07/2011)
PermalinkSoluble collagen approach to a combination tannage mechanism / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 4 (04/2016)
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