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Heat development at the knife roller during leather shaving / Tilman Witt in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
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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
ThermométrieIndex. 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 fluidDOI : 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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37543
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 11 p.[article]Heat, humidity and cure quality / Waldo E. Kallenberger in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXII (Année 1987)
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Titre : Heat, humidity and cure quality Type de document : texte imprimé Auteurs : Waldo E. Kallenberger, Auteur Année de publication : 1987 Article en page(s) : p. 365-371 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Determining hide quality has long been equated with determining cure quality. The central assumption was that a well cured hide was completely and positively protected against all deterioration or quality loss. Many practical experiences have long indicated that this simplified assumption was not completely accurate. However, except for the case of delay in actually curing the hides, the concept that well cured means well protected has enjoyed wide and unchallenged acceptance.
In the last few years the role of halophilic bacteria has become more realistically appraised in the hide curing and storage process (1,2). Now this knowledge of halophiles requires some re-evaluation of the old assumption and position relative to hide cure quality and practice. In order to put this new information into perspective the central observations and procedures for determining cure quality need to be clearly in mind and properly organized. All too often in the past, cure data have been treated too heavily with minimal understanding, and the results have been catastrophically confusing. If the concept does not make sense, then application of the principle becomes confusing and frustrating. The objective of this review of current cure evaluation procedures is to establish a clear picture for the sake of understanding and controlling cured hide quality.En ligne : https://drive.google.com/file/d/1RLeETOxulWc6IpKAI9ZMJq_4KnDDnTOL/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9058
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Code-barres Cote Support Localisation Section Disponibilité 008087 - Périodique Bibliothèque principale Documentaires Disponible Heat resistance for industrial love leather / J. Cot in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 73 (Année 1989)
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Titre : Heat resistance for industrial love leather : Draft method IUP/35 Type de document : texte imprimé Auteurs : J. Cot, Auteur Année de publication : 1989 Article en page(s) : p. 62-63 Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The method is intended for use with any industrial glove leather and other protective clothing, both in finished and unfinished conditions.
A test specimen is heated in an oven, its shrinkage and change in flexibilityassessed, as well as other changes, too, as e.g. of colour, of its exterior characteristics and shape.En ligne : https://drive.google.com/file/d/1yFHNh5TzKztb6-FjnaQaUDf0KI6IAAnq/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8829
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Code-barres Cote Support Localisation Section Disponibilité 007136 - Périodique Bibliothèque principale Documentaires Disponible Heavy metal contents of various finished leathers / Bahri Basaran in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 6 (11-12/2006)
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Titre : Heavy metal contents of various finished leathers Type de document : texte imprimé Auteurs : Bahri Basaran, Auteur ; M. Iscan, Auteur ; Behzat Oral Bitlisli, Auteur ; Ahmet Aslan, Auteur Année de publication : 2006 Article en page(s) : p. 229-234 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir -- Teneur en métaux lourds Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this study, an investigation was made into the heavy metal content of leather articles. The metals concerned were cobalt, chromium, copper, zinc, lead and nickel as these metals may be subject to restrictions in some products because of their toxic characteristics. Insole leathers, upper leathers and garment leathers were studied as likely contaminating sources because of their extensive contact with the human body.
Total amounts of heavy metals were initially measured by digestion. In addition, the possible amounts of heavy metals which would easily be extracted in use were extracted in aqueous and artificial perspiration solutions and analyzed using ICP-AES.
It was concluded that the heavy metal content of finished leathers depended mainly on the chemicals used in production, and in particular high chromium contents in leather goods were determined. Also, small amounts of cadmium, zinc, lead, cobalt and copper were detected due to chemical and physical reactions during dyeing and finishing processes. The results of heavy metal contents were compared with limit values for leather and textile articles.Note de contenu : - Table 1 : Conditions of ICP-AES analysis
- Table 2 : Analytical conditions used in studies with ICP-AES
- Table 3 : Wavelengths in ICP-AES analysis
- Table 4 : Heavy metal contents of garment leathers
- Table 5 : Heavy metal contents of insole leathers
- Table 6 : Heavy metal contents of upper leathersEn ligne : https://drive.google.com/file/d/1zwQRy4wLVW-9TTsfnQ-2atUGGE8jzKBz/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39046
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 90, N° 6 (11-12/2006) . - p. 229-234[article]Henna–aluminum combination tannage : a greener alternative tanning system / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 6 (06/2011)
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Titre : Henna–aluminum combination tannage : a greener alternative tanning system Type de document : texte imprimé Auteurs : A. E. Musa, Auteur ; Rathinam Aravindhan, Auteur ; Balaraman Madhan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; B. Chandrasekaran, Auteur Année de publication : 2011 Article en page(s) : p. 190-199 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse
Sulfate d'aluminium
Tannage combinéLe tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en œuvre par exemple Chrome-Végétal ou Chrome-Synthétique
Tannage minéralTannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium
Tannage végétalIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Development of cleaner technologies for leather manufacture is imperative for the sustenance of the tanning industry. In the present study, a combination tanning system based on a henna-aluminum tannage for the production of upper leathers as a cleaner alternative is presented. Extract from the leaves of widely distributed Lawsonia inerims (Henna) from Sudan has been evaluated for its tanning characteristics in a combination tanning system based on henna and aluminum sulfate. Aluminum-henna (Al-henna) leathers tanned using 2% Al2O3; followed by 20% henna resulted in shrinkage temperature above 95°C. The uptake of henna in henna-Al tanning system with henna (20%) followed by aluminum (2% Al2O3) has been found to be better than the tanning system of Al-henna. These leathers showed compact fibre structure, indicating that the tanning process did not bring about any major change or destruction on the fibre structure of the leathers. Surface colour values of henna-Al leathers resulted in darker shades with less red and more yellow components in the crust leathers. The combination tanning system provides significant reduction in the discharge of total dissolved solids in the wastewater. Henna-Al combination tanning system resulted in leathers with good organoleptic and strength properties. The work presented in this paper established the use of henna and aluminum combination tanning system as an effective alternative cleaner tanning methodology. Note de contenu : - EXPERIMENTAL METHODS : Materials - Aqueous extraction of tannins from henna leaves - Preparation of basic aluminum sulfate solution - Henna and aluminum combination tannage - Measurement of hydrothermal stability of leathers - Physical testing and hand evaluation of leathers - Measurement of softness in leathers - Scanning electron microscopic analysis of leather samples - Analysis of spent liquors from tanning trials - Analysis of exhaustion of tanning spent liquors - Color measurements of control and experimental leathers - Evaluation of chemical constituents in leathers.
- RESULTS AND DISCUSSION : Optimization of combination tanning system using henna and aluminum - Performance of leathers organoleptic properties of leathers - Strength characteristics of experimental and control crust leathers - Softness measurements of henna-Al tanning system - Scanning electron microscopic analysis of leather samples - Reflectance measurements - Effect of surface color on control and experimental leathers - Chemical analysis of the crust leather - Environmental tolerability and spent liquor analysis.En ligne : https://drive.google.com/file/d/1Gf6K3aai4yAs469aF02XfUDmHP8G4M0Z/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11718
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Code-barres Cote Support Localisation Section Disponibilité 16697 - Périodique Bibliothèque principale Documentaires Disponible Heterogeneous interaction between sulpho-syntans and collagen, part 6 / Z. Korenek in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 76, N° 3 (05-06/1992)
PermalinkHeterogeneous interaction between sulpho-syntans and collagen, part 7 / Z. Vinklà rek in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 76, N° 5 (09-10/1992)
PermalinkHeterogeneous interaction between sulpho-syntans and collagen. Part I : qualitative approach / Z. Vinklà rek in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 72 (Année 1988)
PermalinkHeterologous expression of alkaline metalloproteinases in bacillus subtilis sck6 for eco-friendly enzymatic unhairing of goatskins / Shihao Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 3 (03/2022)
PermalinkHeterologous expression of metalloproteinases from planococcus halotolerans SCU63T and eco-friendly enzymatic dehairing of goatskin / Zhang Shihao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 105, N° 3 (05-06/2021)
PermalinkHide and leather characteristics of afrikaner and friesland bulls and steers slaughtered at various ages between birth and 24 months / Alan E. Russell in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61 et 62 (Années 1977 et 1978)
PermalinkHide and leather characteristics of afrikaner and friesland bulls and steers slaughtered at various ages between birth and 24 months / Alan E. Russell in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61, N° 1 (01-02/1977)
PermalinkHide and leather characteristics of young afrikaner-type steers slaughtered at four different live masses / Alan E. Russell in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 64, N° 1 (01-02/1980)
PermalinkHide and skin - What's in it for you ? / Amanda Michel in LEATHER INTERNATIONAL, Vol. 210, N° 4789 (04/2009)
PermalinkHide and skins : physical change and effects within chemical processing / Richard Daniels in WORLD LEATHER, Vol. 18, N° 5 (08/2005)
PermalinkHide collagen as a food / R. L. Henrickson in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXV (Année 1980)
PermalinkHide defects of feedlot cattle : Assessment of cattle management, breed type, sex, live market weight, and source factors on hide quality / W. T. Wright in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 4 (04/2021)
PermalinkHide powder azure and azocoll as substrates for assay of the proteolytic activity of bate / Samuel M. Mozersky in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVII, N° 8 (08/1992)
PermalinkHide protein as a food additive / R. L. Henrickson in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXIX (Année 1984)
PermalinkHide, skin and leather defects : a guide to their microscopy / Mary Dempsey / Palmerston North [Nouvelle Zélande] : New Zealand Leather and Shoe Research Association (1984)
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