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Micro analysis of moisture permeability and its changing trend in thin cowhide / Abigail Clare in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 2 (03-04/2022)
[article]
Titre : Micro analysis of moisture permeability and its changing trend in thin cowhide Type de document : texte imprimé Auteurs : Abigail Clare, Auteur ; Fang Songchun, Auteur ; Wang Ji, Auteur ; Huang Zhuo, Auteur Année de publication : 2022 Article en page(s) : p. 61-64 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse
Cuirs et peaux -- Effets de l'humidité
Cuirs et peaux -- Effets de la température
Cuirs et peaux de bovins
PerméabilitéIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Natural leather has excellent moisture permeability. With the fashionable design of leather clothing, research on the processing and properties of thin natural leather has become more and more important. In this paper, after 0.8mm thin cowhide was obtained using a precision leather machine with blade [splitting machine], the arrangement of protein fibres was observed by a 1000X scanning electron microscope. Under the environmental conditions of a pressure of 1 atmosphere, 40°C and humidity of 69%, it is found that the relationship between the moisture permeability (y) of cow leather and thickness (x) is y = -0.11x + 4.23. The reason why the thinner the cow leather, the better the moisture permeability is was analyzed microscopically ; Secondly, the effects of amblent temperature and moisture permeability time on the moisture permeability of thin leather were investigated. It was found that the higher the temperature, the greater the moisture permeability of thin leather. The moisture permeability of thin leather reached the maximum when the temperature was 80°C. The three-dimensional surface fitting was carried out for the changes of moisture permeability of thin leather with time and temperature. The regression equation of moisture permeability(y) of thin leather with moisture permeability time (t) and temperature (T) was as follows: y=-11.9t2+ 2.498tT - 0.07923T2-91.92t + 4.748T - 46.19. Note de contenu : - EXPERIMENTAL PROCEDURES : Experimental instruments - Experimental materials - Moisture permeability calculation
- RESULTS AND DISCUSSION : Effect of cowhide thickness on moisture permeability and micro analysis - Relationship between moisture permeability of thin cowhide with time and temperature - Comprehensive variation of moisture permeability of thin leather with time and temperatureEn ligne : https://drive.google.com/file/d/1nJaaodm5PRG0asx1fhG-9Y060v0rsYAz/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37484
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 2 (03-04/2022) . - p. 61-64[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23351 - Périodique Bibliothèque principale Documentaires Disponible The ecotoxicity of leathers under different tanning methods / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 2 (03-04/2022)
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Titre : The ecotoxicity of leathers under different tanning methods Type de document : texte imprimé Auteurs : Zhong Anhua, Auteur ; Fang Songchun, Auteur ; Wang Ji, Auteur ; Huang Zhuo, Auteur Année de publication : 2022 Article en page(s) : p. 65-72 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chrome
Chrome hexavalent -- Toxicologie
Cuirs et peaux -- Analyse
Ecotoxicologie
Hydrocarbures
Métaux lourds
Métaux lourds -- Toxicologie
Sols -- Pollution
Tannage -- Aspect de l'environnementIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : End-of-life is important when determining a material's sustainability credentials. Raw hides/skins are naturally biodegradable and, therefore, leather can play a key rote in a sustainable circular future. The addition of chemicals during tanning alters the disintegration rate and, different tanning methods likely produce leather with various toxicities.
Leather samples tanned using different methods were analysed for detectable values of common toxins. Ecotoxicological screening was carried out on 5-samples of each type of leather (chrome-tanned, chrome-free and vegetable-tanned). Chrome-tanned leather had significantly more detectable levels of chromium than other leathers. Vegetable-tanned leathers had significantly more detectable levels of extractable petroleum hydrocarbons compared to other samples.
At end-of-life, toxins from biodegradable leathers may contaminate soil. Oxidants within soit oxide Cr(III) to more toxic Cr(VI). Chromium is taken up by plants, impacting growth and development, due to its structural similarity to other essential nutrients. Petroleum hydrocarbons negatively impact soit enzyme activities which alters nutrient availability. These hydrophobic compounds stunt plant growth and development and exert a carcinogenic effect. Toxins within soils may affect organisms directly through ingestion or indirectly through bioaccumulation which poses a risk to human health.
Although the tanning method influences the ecotoxicological screen, the leather-making process is diverse (depending on desired leathers properties and application) and therefore, tanning type is not an accurate determinant of leather toxicity. Furthermore, the ecotoxicological screen is not comprehensive and, therefore, compounds with high toxicity may not be currently detected. Ecotoxicological screening methods should be improved to cover all compounds of concern.Note de contenu : - Sources of heavy metals
- Toxicity of chromium
- Sources of toxins at low detectable levels
- Sources of extractable petroleum hydrocarbons
- Toxicity of petroleum hydrocarbons
- Influence of soil characteristics on leather toxicity
- Alternative factors influencing leather toxicity
- Table 1 : Outcomes of the Kruskal-Wallis test, along with medians and ranges for each toxin
- Table 2 : High hazard threshold vs detected levels of contaminants in soilEn ligne : https://drive.google.com/file/d/1W913HlTHZbbPNsl2VgsO_X9frP6gz9Xh/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37485
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 2 (03-04/2022) . - p. 65-72[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23351 - Périodique Bibliothèque principale Documentaires Disponible