Antifungal leather treatment with biological extracts / Kathrin Leppchen in LEATHER INTERNATIONAL, Vol. 213, N° 4816 (11-12/2011)  

[article]  inLEATHER INTERNATIONAL > Vol. 213, N° 4816 (11-12/2011) . - p. 36-38 Titre : Antifungal leather treatment with biological extracts Type de document : texte imprimé Auteurs : Kathrin Leppchen, Auteur ; Martin Völker, Auteur ; Michael Meyer, Auteur Année de publication : 2011 Article en page(s) : p. 36-38 Langues : Anglais (eng) Catégories : Biofongicides Cuirs et peaux -- Conservation Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather as a natural product containing grease, dyes and tanning agents is an ideal nutrient source for moulds. The risk of mould growth is given in nearly all process stages ofleather production as well as the subsequent processing and use. Their enzymes digest proteins, fats and carbohydrates of the leather structure. Optimum conditions moulds germinate, grow and may eventually destroy the leather. Due to the global division of labour in the leather industry and the resulting transportation of raw hides, intermediates, leather and leather goods over long distances, it is necessary to protect the package and material against a growth of moulds. Currently, adequate protection of leather is ensured solely by using toxic and ecologically critical preservatives such as benzothiazoles or phenol derivatives. This paper introduces an antifungal treatment for leather and its intermediates on the basis of biological and environmentally friendly agents. When searching for appropriate agents that are known to feature antifungal properties, especially carboxylic acids with 8 to 11 carbon atoms including caprylic acid (C8), pelargonic acid (C9) and undecylenic acid (C11) were noted as effective. The carboxylic acids destroy cell walls, denature proteins of fungi, impact fatty acid synthesis and pigmentogenesis, thus preventing the growth of moulds, eg by suppressing their respiration. Carboxylic acids are classified as environmentally friendly, physiologically safe and non-toxic. As a bulk-product from fat lipolyse they are easy to synthesis and readily available. The antifungal treatment should be effective during transportation of packaged goods and prevent the germination of existing mould spores on leather materials regardless of surrounding microclimate. Note de contenu : - Determination of the antifungal efficacy of the fatty acids and their salts - Treatment of leather and its intermediates - Antifungal activity of fatty acids and their salts and treatment of intermediates - Variation in concentration - Variation in exposure time - Variation of spore concentration - Antifungal spectrum - Exposure to different physical conditions - Impact on material properties - Antifungal efficacy of the fatty acid salt with aldehyde tanned leather En ligne : https://drive.google.com/file/d/1ne1-pgKrp--5COfKzfWERDZ5VC0RUB19/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12756 [article]

Réservation

Réserver ce document

Exemplaires (2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
13581	-	Périodique	Bibliothèque principale	Documentaires	Disponible
13580	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Corrected or non-correted grain ? FILK-QMA-1201 - a method to evaluate finished leather / Haiko Schulz in WORLD LEATHER, Vol. 18, N° 2 (04/2005)  

[article]  inWORLD LEATHER > Vol. 18, N° 2 (04/2005) . - p. 41-44 Titre : Corrected or non-correted grain ? FILK-QMA-1201 - a method to evaluate finished leather Type de document : texte imprimé Auteurs : Haiko Schulz, Auteur ; Michael Meyer, Auteur Année de publication : 2005 Article en page(s) : p. 41-44 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Finition Echantillonnage Evaluation Microscopie Surfaces -- Analyse Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A new method is described and illustrated, which enables differentiation between finished leathers that have been corrected or not. The method is very senstive, and can readily detect leathers that have only been lightly corrected, even when the leathers have been slightly snuffed. Note de contenu : - Sample preparation - Sample evaluation - Microscopic analysis of the grain - Microscopic analysis of the back-side of the finish - Microscopic analysis of the cross-section - Panel 1 : Definitions - Fig. 1a : Leather surface after complete removal of the finish layer. - Fig. 1b : Leather surface after incomplete removal of the finish layer. - Fig. 2a : Back-side of the finish layer after removal from a corrected grain leather. No fibres remaining in the finish. - Fig. 2b : Back-side of the finish layer after removal from a corrected grain leather. Fibres left sticking in the finish. - Fig. 3 : Leather surface of a full grain leather after successful removal of the finish. The arrows indicate the damage-free sickle- shaped pellicles and the fine structure. - Fig. 4 : Surface of a lightly snuffed leather after removal of the finish. Parallel cut/grind marks are a clear characteristic of correction. - Fig. 5 : Surface of a buffed leather after removal of the finish. Truncated hair openings are observed as well as grind marks. - Fig. 6 : Surface of a heavily buffed leather after removal of the finish. Hair openings disappear in a surface with a suede-like effect. - Fig. 7 : Surface of a crust leather after light abrasion with buffing paper. Fine cut/grind marks can still be clearly observed. - Fig. 8 : Back-side of a finish from a full grain leather. The mirror image of the typical grain surface is clearly observed as a result of the base coat flowing into the hair follicles. - Fig. 9 : Back-side of a finish from a leather that was slightly corrected. The cut/grind marks are clearly visible. - Fig. 10 : Back-side of a finish from a corrected grain leather. The cut/grind marks are clearly visible as well as the impression of leather fibres that remained adhering to the finish. - Fig. 11 : Back-side of a finish from a leather that was stucccoed and corrected. The leater substrate was digested by enzymatic treatment. - Fig. 12 : Cross-section of leather that was not corrected. The curvature of the hair openings is completely preserved. - Fig. 13 : Cross-section of a corrected leather. The curvature of the hair openings has been lost. They appear truncated,ending at the boundary layer in an acute angle. Base coat penetration into fibre network. En ligne : https://drive.google.com/file/d/1UoFYIeR41eUvEfOECWGfc0ZTIU6kuUYu/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32338 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
006182	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Heat development at the knife roller during leather shaving / Tilman Witt in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 11 p. Titre : Heat development at the knife roller during leather shaving Type de document : texte imprimé Auteurs : Tilman Witt, Auteur ; Anke Mondschein, Auteur ; Jens-Peter Majschak, Auteur ; Michael Meyer, Auteur Année de publication : 2021 Article en page(s) : 11 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux Cuirs et peaux -- Analyse Cylindre à couteaux Dérayage Eléments finis, Méthode des Thermocinétique Thermographie Thermométrie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather, which is regularly tanned from whole hides of up to 5 m2, needs a constant thickness over the entire surface in order to be processed into high-quality consumer goods such as shoes, furniture and car interiors. Precise adjustment of the thickness is achieved by shaving. On an industrial scale, rotating knife rollers are used to remove chips from the flesh side of semi-finished leathers whereby adjusting the specified thickness and generating a smooth surface. Care must be taken to prevent the temperature from rising above the denaturation temperature of the leather during shaving in order to avoid any loss of quality. Beside this, temperature rise is always a sign of friction showing avoidable energy expenditure. In order to localize the source of friction during shaving, actual temperature development at the roller knife is studied. Different measuring methods are used to evaluate the temperature increase at the blade roll of the shaving machine. The finite element method is used to thermally simulate the process. Measured temperatures, the geometry of the blade roll and process data are taken into account for modelling the temperature development close to the blade edge. The obtained results enhance the understanding of temperature generating processes during machine operation and allow conclusions about potential improvements in the design of the machine and blades. Note de contenu : - INTRODUCTION : Leather reactions to thermal stress - The shaving machine - Cutting principle and energy consumption - MATERIALS AND METHODS : Pre tanned leathers and shaving - Analysis of shaved hides - High speed infrared imaging - Temperature measurement of the cutting tool - Measurement of the roller turning speed - Thermal modelling with finite element method - Calculating the heat transfer coefficient - RESULTS : Thermography - Thermistor measurements - Transient finite element simulation - Analysis of shaved hides - Table 1 : Rizzi LW 3200 Shaving Machine Characteristics - Table 2 : Relevant material properties of steel - Table 3 : Selected material values for the surrounding fluid DOI : https://doi.org/10.1186/s42825-021-00057-0 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00057-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37543 [article]

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Hides and humidity / Michaela Schroepfer in LEATHER INTERNATIONAL, Vol. 219, N° 4874 (09/2017)  

[article]  inLEATHER INTERNATIONAL > Vol. 219, N° 4874 (09/2017) . - p. 63-64 Titre : Hides and humidity Type de document : texte imprimé Auteurs : Michaela Schroepfer, Auteur ; Michael Meyer, Auteur Année de publication : 2017 Article en page(s) : p. 63-64 Langues : Anglais (eng) Catégories : Analyse thermique Cuirs et peaux -- Propriétés thermiques Cuirs et peaux de bovins Humidité -- Mesure Tannage au chrome Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The thermal behaviour of bovine skin and wet-blue in varying humidity can be measured by differential scanning calorimetry. The authors discusses the process. Note de contenu : - Materials and mathods - Chromium-tanned collagen - Dry state - Fig. 1. DSC scans of untanned hides at different water contents - Fig. 2. DSC scans of hide collagen tanned with chromium sulphate at different degrees of hydration En ligne : https://drive.google.com/file/d/1Yto3QO8aPrtvnAfBmlOqhXTVwSVlV9o3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29048 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
19113	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Influence of elastin degradation on the mechanical properties of leather / Michaela Schröpfer in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 9 (09/2014)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIX, N° 9 (09/2014) . - p. 306-313 Titre : Influence of elastin degradation on the mechanical properties of leather Type de document : texte imprimé Auteurs : Michaela Schröpfer, Auteur ; Enno Klüver, Auteur ; Michael Meyer, Auteur Année de publication : 2014 Article en page(s) : p. 306-313 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Propriétés mécaniques Elastine -- Détérioration Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The influence of elastin degradation in leather on important mechanical properties was investigated. The elastin content of pelts and wet blues was determined by chromatographic analysis of desmosine, which is a specific and hydrolytically stable crosslinking. Analysis of pelts was performed directly, while chrome containing samples had to be detanned prior to analysis. It is demonstrated that elastase significantly reduces the elastin content. In contrast to often assured statements on the marked influence of elastase on softness, area yield, tensile strength and elongation of leather, our investigations showed no significant changes in the mechanical properties of leather as well as area yield, grain quality or softness after treatment with elastase. It is concluded that the impact of elastin on leather properties is generally lower than postulated before or that it is not pronounced in the dry state. Note de contenu : - EXPERIMENTAL : Production of leather and enzyme treatment - Elastin analysis - Determination of chrome content - Mechanical tests - RESULTS AND DISCUSSION : Analysis of elastin - Area measurement - Permanent elongation - Tensile strength - Loose grain and softness En ligne : https://drive.google.com/file/d/1fhGNRKKSK0nkup_ByHs7HYqJk7asw4Pp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21868 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
16485	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Influence of the cattle breed on the properties of crusts / Sandra Stenzel in INTERNATIONAL LEATHER MAKER (ILM), N° 45 (01-02/2021)  

Permalink

Leather stability in alternate climate conditions / Michaela Schröpfer in LEATHER INTERNATIONAL, Vol. 215, N° 4828 (03/2013)  

Permalink

Leather surface refinement with application of the TIO2-SIO2-GLYMO Nanocomposite and lacquer coating / Meruyert Kaygusuz in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 5 (09-10/2018)  

Permalink

A new marking system for leather based on encapsulated DNA / Sandra Stenzel in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 9 (09/2015)  

Permalink

Surface activation and coating on leather by dielectric barrier discharge (DBD) plasma at atmospheric pressure / Meruyert Koizhaiganova in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 2 (03-04/2017)  

Permalink

Tanning capacity of Tessmannia burttii extracts : the potential eco-friendly tanning agents for the leather industry / Cecilia R. China in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

Permalink

Under the microscope / Carolina Gomes in LEATHER INTERNATIONAL, Vol. 220, N° 4885 (10/2018)

Permalink

---

1 (1 - 12 / 12)