Dépouillements

Performance evaluation of pelts and leather from domestic hair sheep crossbreeds / Dennis C. Shelly in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 6 (06/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 6 (06/2009) . - p. 194-203 Titre : Performance evaluation of pelts and leather from domestic hair sheep crossbreeds Type de document : texte imprimé Auteurs : Dennis C. Shelly, Auteur ; Divya Pasapulati, Auteur ; Palanisamy Thanikaivelan, Auteur ; Biyu Peng, Auteur ; Clinton Hodges, Auteur Année de publication : 2009 Article en page(s) : p. 194-203 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The attributes and physical properties of pelts and leather from selected hair sheep crossbreeds were assessed. Four different sheep breed classes (from Rambouillet, Dorpcroix, Barbados and Dorper), each with about 20 individuals, were included. Spanish goats were used as a control. Animals were raised and finished under identical conditions and flayed pelts were enumerated and processed to finished leather by commercial firms. Pelts and leathers were evaluated at Texas Tech for stretch, softness, fullness, grade, tensile strength, % elongation at break, stiffness, softness (negative slope angle), area yield, hair pore count, grain-to-corium thickness ratio and hide substance (Kjeldahl). Organoleptic and instrumental analysis results are presented and correlated. An objective scoring criterion is proposed. Comparisons across the breed classes are made. Outstanding and/or noteworthy performance scores are noted and recommendations for end-use applications are given. En ligne : https://drive.google.com/file/d/1TZ0hADs9DP2FmOOCKUPtqlJk4y9LM3TQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5985 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
011388	-	Périodique	Bibliothèque principale	Documentaires	Disponible

The inducement and modulation of collagen fiber on crystal morphology of calcium carbonate / Lihong Fu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 6 (06/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 6 (06/2009) . - p. 204-209 Titre : The inducement and modulation of collagen fiber on crystal morphology of calcium carbonate Type de document : texte imprimé Auteurs : Lihong Fu, Auteur ; Shuling Chai, Auteur ; Cheng Jingqiu, Auteur Année de publication : 2009 Article en page(s) : p. 204-209 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Based on the fundamental principles of biomineralization, a CaCO3/proteins composite can be synthesized by biomimetic synthesis under dynamic conditions, using collagen fiber as the matrix. The inducement and modulation of collagen fibril on the crystal morphology of calcium carbonate was studied. The crystalline structure and polymorph of calcium carbonate at different mass ratio of [Collagen fiber]/[Ca2+] was characterized using X-ray diffraction(XRD) and refined with Rietveld method. The microstructure parameters, such as the lattice strain, bond length, crystallite size (A, B and C), density of calcium carbonate cell, were calculated to characterize the crystalline structure of calcium carbonate at atom level. The polymorph of calcium carbonates can be changed by the [collagen fiber]/[Ca2+] ratio. The degree of super-saturation and number of nucleation have greater influence on the lattice strain, the lattice strain positively correlates to crystallite size nonlinearly. The crystals face, being a more perfect face and with minor defects, had greater stability. By increasing [collagen fiber]/[Ca2+] ratio and crystallite size rise, the vitality of calcium carbonate enhanced. En ligne : https://drive.google.com/file/d/1rIyeEav9A1xofHo3-QDCaUdoKOTnNf35/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5986 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
011388	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Nano-TiO2 in-situ hybrid polyurethane with enhanced permeability for PU leather manufacture / Chen Yi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 6 (06/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 6 (06/2009) . - p. 222-231 Titre : Nano-TiO2 in-situ hybrid polyurethane with enhanced permeability for PU leather manufacture Type de document : texte imprimé Auteurs : Chen Yi, Auteur ; Zhang Xiuli, Auteur ; Haojun Fan, Auteur ; Bi Shi, Auteur Année de publication : 2009 Article en page(s) : p. 222-231 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A novel organic-inorganic nano-hybrid process combined with industrialized wet-phase inversion coating-forming method was developed for the modification of polyurethane (PU) leather coating with in-situ-generated nano-TiO2. The cross section morphologies, water vapor permeability, gas permeability, mesopore size distribution and specific surface area of the hybrid samples were investigated. SEM analysis indicated that when the TiO2 concentration increased from 0.25wt% to 1.00wt%, the average size of nano particles, which dispersed uniformly throughout the polymer matrix, increased correspondingly from 60-80nm to 90-120nm without obvious agglomerates observed. After nano hybridization, both water vapor and gas (hydrogen, nitrogen and oxygen) permeability of samples were found to increase with an increasing concentration of nano-TiO2, which was explained as voids formed at the polymer-nano particle interface due to phase incompatibility. The existence of such voids in samples was proven in the nitrogen adsorption/desorption experiment, by the detection of extra mesopores and higher specific surface area than predicted values. With industrial applicability in the manufacture of PU synthetic leather, the wet-phase inversion hybrid process developed in this study may be of great potential for improving the wear comfort of PU coated leather products. En ligne : https://drive.google.com/file/d/1LTDoSWaTJBLxAnAf8ybzWgidq7pSR9rK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5987 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
011388	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Phosphonium-aluminum combination tanning for goat garment leather / Ren Long-Fang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 6 (06/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 6 (06/2009) . - p. 232-241 Titre : Phosphonium-aluminum combination tanning for goat garment leather Type de document : texte imprimé Auteurs : Ren Long-Fang, Auteur ; Wang Xue-Chuan, Auteur ; Qiang Tao-Tao, Auteur ; Ren Yong-Qiang, Auteur ; Xu Jianxin, Auteur Année de publication : 2009 Article en page(s) : p. 232-241 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A new tetrakis hydroxymethyl phosphonium sulphate (THPS)-aluminum combination tanning system has been developed. The optimum dosage of THPS was 2.0%. The amount of THPS and basic aluminum chloride was optimized at 2.0% and 3.0% (basing on the weight of pelt). The influence of ligands on the shrinkage temperature (Ts) of leathers was also studied and the Ts of THPS-aluminum combination tanned leathers was above 88°C. Color fastness to dry/wet rub of THPS-aluminum combination tanned leathers was much better than the relevant color fastness to dry/wet rub of leathers tanned with THPS alone. Scanning electron microscopic studies showed that the fiber weave of THPS-aluminum combination tanned leather was much closer than leathers tanned with THPS alone and the fiber weave of THPS-aluminum combination tanned leather was closer(tighter) with an increase of amount of basic aluminum chloride. Hence, with the increase of the amount of basic aluminum chloride, the reactive ability of basic aluminum chloride with collagen fiber was stronger and the softness became worse. Degradation rate of soiling for the THPS-aluminum combination tanning leather was much quicker than that of chrome tanning leather. Through SEM analysis, the surface structure of leather which was not degraded was more regular than the leather degraded for 30 days. Meantime, the of THPS-aluminum combination tanning leather degradated much more easily than the chrome leather, which suggested a benefit for the sustainable development of the leather industry in future. En ligne : https://drive.google.com/file/d/1rceSxbfqOplHnQS3Mb4wFMBANyf5JUUs/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5988 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
011388	-	Périodique	Bibliothèque principale	Documentaires	Disponible