Analysis of the processing histology of mink skin / Zhang Meina in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 2 (02/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 2 (02/2019) . - p. 62-68 Titre : Analysis of the processing histology of mink skin Type de document : texte imprimé Auteurs : Zhang Meina, Auteur ; Yao Tian, Auteur ; Yongguang Wang, Auteur ; Zongcai Zhang, Auteur Année de publication : 2019 Article en page(s) : p. 62-68 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux de vison Peau -- Histologie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Most people around the world regard mink skin as luxurious commodities, since the mink hair is generous and guard hair length is moderate. However, a variety of reasons will attribute to hair loss or orientation phenomenon of upper hair in the processes. The paper studied the processing histology of mink in the processing, which could build a scientific foundation to optimize the process, improve the technical skills and improve product quality. Mink skin samples used in the experiment were taken from soaking, degreasing, bating, pickling, and tanning processes. The photomicrographs were observed by bio-optical microscope. Besides, samples were performed by frozen section method and stained with iron hematoxylin staining method as well as Gill modified hematoxylin staining method. It is found that the hair follicles of the mink were distributed irregularly in the form of compound hair follicles or individual hair follicles. Mink fat glands were very developed. In other words, each hair follicle generally was surrounded by a pair of fat glands. With the increase in degreasing time, the number of fat cells in the fat glands was reduced and the fibers around the hair follicles were initially dispersed. The voids between the collagen fibers became larger and more fully loose after the processes of bating and pickling. In addition, the collagen fiber wove more orderly and closer by tanning. In the case of pickling and bating, most of the hair follicle openings were opened, which could abate the chained force between hair and the follicles and/or the dermal papilla. Note de contenu : - EXPERIMENTAL : Materials and instruments - Sampling - Fixation - Sectioning - Iron hematoxylin staining - Gill modified hematoxylin staining - RESULTS AND DISCUSSION : Soaking tissue sections - Degreasing tissue sections - Bating tissue sections - Pickling tissue sections - Tanning tissue sections - Slicing tissue section En ligne : https://drive.google.com/file/d/13SH9Lvq4FzElR03cn7G0wA6aYgHwa4Uh/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31719 [article]

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Influence on rex rabbit hair by low-temperature plasma in different gas media / Zhang Meina in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 2 (03-04/2019)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 103, N° 2 (03-04/2019) . - p. 91-98 Titre : Influence on rex rabbit hair by low-temperature plasma in different gas media Type de document : texte imprimé Auteurs : Zhang Meina, Auteur ; Liu Hongyan, Auteur ; Li Lixin, Auteur ; Zhang Zongcai, Auteur Année de publication : 2019 Article en page(s) : p. 91-98 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Basses températures Brillance (optique) Colorants acides Colorimétrie Fixation (chimie) Fourrures -- Propriétés mécaniques Fourrures -- Teinture Frottements (mécanique) Lapins Mesure Spectroscopie de photoélectrons Technique des plasmas Index. décimale : 675.3 Technologie de la fourrure Résumé : In order to find out changes of the Rex rabbit hair under different Low Temperature Plasma (LTP) treatments, Rex rabbit hair fibres which were modified by oxygen, nitrogen, and air plasma, were examined by XPS, ultraviolet-visible spectrophotometery, Lab-eye software, HP-386 multi-angle gloss meter, YM-06A electronic single fibre strength meter, as well as by a Y151 fibre friction coefficient tester. The results show that oxygen plasma, nitrogen plasma and air plasma can all dramatically enhance exhaustion and fixation rate of Rex rabbit hair during dyeing. Treatment with air plasma and nitrogen plasma introduced more -NH2 to the surface of Rex rabbit hair fibres, promoting the reaction between -N1-12 and -SO3H of an anionic dyestuff in an acidic medium. Besides, the oxidation of oxygen plasma introduces polar functional groups such as hydroxyl or carbonyl, thus improving the hydrophilicity of Rex rabbit hair fibres. Compared with fibres without plasma treatment, the dyeing depth of fibres treated with oxygen, air, and nitrogen plasma has been significantly enhanced. ln addition, the rupture strength and elongation as well as glossiness of fibres reduces to a slight extent after LTP treatment with oxygen, nitrogen, and air. Ultimately, after oxygen, air and nitrogen plasma, the gap between the friction coefficients of against and along scale is narrowed, which can enhance the ability of the anti-felting performance. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Low-temperature plasma treatment - Dyeing process - Exhaustion and fixation rate measurement - XPS analysis - Colour measurement - Glossiness and strength measurement - Coefficient of friction determination - RESULTS AND DISCUSSIONS : Exhaustion and fixation rate - XPS analysis - Effect of LTP treatment on the glossiness and strength of Rex rabbit hair fibre - Effect of LTp treatment on the friction coefficient of Rex rabit wool fibre - Table 1 : Exhaustion and fixation of different samples dyed with anionic dyestuff - table 2 : Element analysis of LTP trated Rex rabbit hair fibres - Table 3 : The functional group content of Rex rabbit hair fibre - Table 4 : The influence of LTP treatment on the strength of the fibres - Table 5 : The influence of low-temperature plasma treatment on the friction coefficient of the fibres En ligne : https://drive.google.com/file/d/1JD27EmIpv-vh44OuM1dkP3JhAoz5JUlR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32306 [article]

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Study on the degreasing of sheep skin using subcritical fluid extraction / Qiao Xia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 2 (02/2021)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 2 (02/2021) . - p. 39-45 Titre : Study on the degreasing of sheep skin using subcritical fluid extraction Type de document : texte imprimé Auteurs : Qiao Xia, Auteur ; Zhang Meina, Auteur ; Bo Mao, Auteur ; Hong Dai, Auteur ; Zongcai Zhang, Auteur Année de publication : 2021 Article en page(s) : p. 39-45 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Cuirs et peaux -- Analyse Cuirs et peaux -- Dégraissage Cuirs et peaux de moutons Extraction (chimie) Peau -- Histologie Peaux brutes Pentane Le pentane est un alcane linéaire de formule C5H12. Le terme pentane désigne aussi par extension abusive17 les trois isomères C5H12 : le n-pentane, le 2-méthylbutane ou isopentane et le 2,2-diméthylpropane ou néopentane. Ces diverses molécules comportent toutes cinq atomes de carbone. Utilisations : Le pentane est un solvant couramment utilisé en chimie organique. Propriétés chimiques : Le pentane brûle dans l'air selon la réaction : C5H12 + 8O2 —> 5CO2 + 6H2O (Wikipedia) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Degreasing is one of the important processes for the production of leather and fur. This study aimed to develop a degreasing method using subcritical n-pentane. Sheep skin was chosen as raw skin for this investigation. The best possible combination of degreasing parameters was found using single factor experiment and response surface methodology. The effects of temperature and pressure on the degreasing efficiency were evaluated further with histological analysis. The results showed that the optimum degreasing parameters were a degreasing time of 58 min, pressure of 0.45 MPa, temperature of 41.0°C and thus yielded a degreasing rate of 52.46％ theoretically and 51.46% experimentally. Histological sections showed that the degreasing effect of subcritical n-pentane was quite significant and the lipid droplets around the hair follicles were dramatically reduced. It has been proven that subcritical n-pentane degreasing is an effective technique for sheep skin degreasing. Note de contenu : - EXPERIMENTAL : Materials & instruments - Experiment procedure - Sample preparation - Degreasing with subcritical n-pentane extraction - Single factor experiment design of subcritical n-pentane degreasing process - Optimization design of subcritical n-pentane degreasing process by RSM - Characterization of degreasing effect - Histological analysis of degreased skin - RESULTS AND DISCUSSION : Effect of degreasing - Table 1 : Single factor experiment scheme - Table 2 : Factor table for single factor experiment - Table 3 : Response surface experiment level and coding - Table 4 : Experimental scheme of response surface methodology and response value of degreasing rate - Table 5 : Analysis of variance of regression model of subcritical n-pentane degreasing - Fig. 1 : The sheep skin degreasing procedure with subcritical n-pentane - Fig. 2 : Single factor results - Fig. 3 : Residuals - Fig. 4 : Response surface graph and contour map - Fig. 5 : Histological photomicrographs of degreased skin under different temeprature - Fig. 6 : Histological photomicrographs of degreasing skin under different pressure DOI : https://doi.org/10.34314/jalca.v116i2.4234 En ligne : https://drive.google.com/file/d/1fFEfsYfERS70jjgP-KtN7vOTfnm400QO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35307 [article]

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