Back to basics : A framework for leather manufacture / Richard Daniels / Liverpool [Royaume-Uni] : World Trades Publishing (2006) 

Titre : Back to basics : A framework for leather manufacture : Wet process and mechanical operations : raw to the retanned state Type de document : texte imprimé Auteurs : Richard Daniels, Auteur ; Walter Landmann, Auteur Editeur : Liverpool [Royaume-Uni] : World Trades Publishing Année de publication : 2006 Importance : 59 p. Présentation : ill. Format : 30 cm ISBN/ISSN/EAN : 978-0-9522139-9-4 Langues : Français (fre) Catégories : Cuir, Travail du Tannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Note de contenu : 1. Flat and predictable leather 2. Water within the skin structure 3. ater within the skin structure 4. Charge and fixation 5. Hides and skins : temperature and physical change 6. Hides and skins : physical change and effect within chemical processing 7. Process vessels : effects within chemical processing 8. Modifying the skin structure 9. Interactions : hide & skins, and mechanical forces 10. The behaviour of pieces in machine operations as a function of temperature and moisture content 11. Hides and skins : the reception of force 12. Reciprocating multi-roller machines : the fleshing machine in operation 13. Reciprocating multi-roller machines : samming, setting and samm/setting machinery in operation 14. Reciprocating multi-roller machines : the shaving machine in operation 15. The splitting machine and its tools in operation 16. Part 1 : process vessels : design and operation 16. Part 2 : process vessels : movement of goods Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12864

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Back to basics : A framework for leather manufacture : Wet process and mechanical operations : raw to the retanned state URL

Charge and fixation / Richard Daniels in WORLD LEATHER, Vol. 18, N° 4 (06-07/2005)  

[article]  inWORLD LEATHER > Vol. 18, N° 4 (06-07/2005) . - p. 21 Titre : Charge and fixation : Back to Basics : A framework for leather manufacture Type de document : texte imprimé Auteurs : Richard Daniels, Auteur ; Walter Landmann, Auteur Année de publication : 2005 Article en page(s) : p. 21 Langues : Anglais (eng) Catégories : Agents de tannage Chrome Collagène Complexes métalliques Fixation (chimie) Glutaraldéhyde Liaisons hydrogène Prétannage Réticulation (polymérisation) Tanins végétaux Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The rate of fixation between the collagen structure and pretanning agents, dyes and many polymeric resins and fatliquors is determined by the charge of the collagen and the charges of the product. An increase in alkalinity causes an increase in negative charge within the skin, due to lesses of amino(+) groups. Under these conditions, if a chemical with a strong positive charge is offered-such as chrome or aluminium salts-there is a very rapid reaction with the surface carboxyl(-) groups and no penetration. Under the same conditions, a product with a negative charge-such as a syntan-will combine slowly and penetrate deep into the structure as there is a reduced number of available amino(+) groups for fixation. Note de contenu : - Panel E4/1 : Charges relating to groups and products - Panel E4/2 : Crosslinking by chromocomplexes: shift to cationic behavior - Panel E4/3 : Crosslinking by glutaraldehyde : shift to anionic behavior - Panel E4/4 : Hydrogen bonding by vegetable or synthetic tannins : shift to anionic behavior En ligne : https://drive.google.com/file/d/16QA5aGRIIVKhSzjDgZd78zp5ZsG158Nb/view?usp=drive [...] Format de la ressource électronique : pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32375 [article]

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Flat and predictable leather / Walter Landmann in WORLD LEATHER, Vol. 18, N° 3 (05/2005)  

[article]  inWORLD LEATHER > Vol. 18, N° 3 (05/2005) . - p. 29 Titre : Flat and predictable leather Type de document : texte imprimé Auteurs : Walter Landmann, Auteur ; Richard Daniels, Auteur Année de publication : 2005 Article en page(s) : p. 29 Langues : Anglais (eng) Catégories : Cuirs et peaux de bovins Homogénéisation (technologie) Peaux brutes -- Structure Surfaces (Physique) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Hides and skins are naturally rounded and fully contoured to the shape of the living animal. In addition the skin allows flexibility of movement and protection, but these needs vary according to the area being covered. Some parts, such as the belly areas, need no stretch easily while other areas, such as the butt and backbone, are thicker, denser and less exendable. One of the main leather making tasks is to produce a flat leather. However the leather must also show greater uniformity in terms of elasticity and shape retention to be useful as a material in the manufacture of an end product. The liming process starts to address the problems of curvature and separation of the fibre structure. This leads to a general flattering in the finished leather as the fibres can move more readily. Moreover, a major relaxation occurs during the fleshing operation as the membrane-like tissues are cut from the flesh side of the hide, as these restrict and confine movement. This is especially noticeable in the peripheral parts of the hide-bellies and shanks-and in the growthy neck areas. The hides relax further during the deliming/bating, and degreasing if appropriate, with the beefits largely maintained during the tanning process. If managed correctly, the process not only stabilises the hide, but also maintains a flat grain with minimised draw and growth. Note de contenu : - Stretch : aiming for cross-hide uniformity - Shape retention and set - Additional information - Panel EI/I : The effects of splitting/shaving to substance En ligne : https://drive.google.com/file/d/1CC4umEFzhtoqcEJUyMhZD0RS0_y3lhfh/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32461 [article]

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Hide and skins : physical change and effects within chemical processing / Richard Daniels in WORLD LEATHER, Vol. 18, N° 5 (08/2005)  

[article]  inWORLD LEATHER > Vol. 18, N° 5 (08/2005) . - p. 45 Titre : Hide and skins : physical change and effects within chemical processing Type de document : texte imprimé Auteurs : Richard Daniels, Auteur ; Walter Landmann, Auteur Année de publication : 2005 Article en page(s) : p. 45 Langues : Anglais (eng) Catégories : Basses températures Cuirs et peaux Cuirs et peaux -- Propriétés physiques Traitement chimique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The forces applied to skins in wet chemical processing relate to the type of processing vessel and its internal configuration. These forces can be viewed as constant when processing at uniform loadings, float levels, speed of rotation and time. However, the way that these forces act will vary as the skin physically changes. For examples : - As skins rehydrate in soaking they soften, so the mechanical action is reduced. - Alkaline swelling causes the hides to become less flexible, and the mechanical action increases - The inflexibility of a limed skin decreases in deliming, and the skins become more flaccid - As fully-penetrated tanning agents throughout a pickled skin begin to fix and create leather, the skin becomes more rigid. Even if the forces applied remain constant, the mechanics involved alter in line with changes in skin characteristics and behaviour. Note de contenu : - Changes in skin motion - The effects of temperature variation - Processing at lower temperatures - Accumulative effects En ligne : https://drive.google.com/file/d/1kF_4zqVVLsthfrcT0kbRqUZndPXxNDgg/view?usp=drive [...] Format de la ressource électronique : pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32472 [article]

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Hides and skins : temperature and physical change / Richard Daniels in WORLD LEATHER, Vol. 18, N° 5 (08/2005)  

[article]  inWORLD LEATHER > Vol. 18, N° 5 (08/2005) . - p. 44 Titre : Hides and skins : temperature and physical change Type de document : texte imprimé Auteurs : Richard Daniels, Auteur ; Walter Landmann, Auteur Année de publication : 2005 Article en page(s) : p. 44 Langues : Anglais (eng) Catégories : Cuirs et peaux -- Effets de la température Cuirs et peaux -- Propriétés physiques Cuirs et peaux de bovins Elasticité Plasticité Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Temperature has a profound influence on the physical properties of hides and skins within every stage of leather manufacture. Apart from increasing the rate of a chemical process, a higher temperature will ease the ability of the skin to stretch under load. An example is gien as Panel E5/1 where the extension of saturated bovine samples under constant load and rising temperature is shown. Moreover, as the temperature rises, there is an increasing tendency to remain in an extended state. Note de contenu : - Change in bound water - Deformation of the polypeptide backbone - Plastic-like behaviour and set as part of leather making - Panel E5/1 : Effects of temperature on the extension of a sample under constant load - Panel E5/2 :Loss tangent, tan δ, as a function of temperature for acetone-dried skin samples pre-conditioned in a given relative humidity environment (0, 35, 65% RH) - Panel E5/3 : Definitions of elastic behaviour and plastic behaviour En ligne : https://drive.google.com/file/d/11zUlk-yojrN0-_knp3OPvNxPX2RGH9bd/view?usp=drive [...] Format de la ressource électronique : pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32471 [article]

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Interactions : hides & skins, and mechanical forces / Richard Daniels in WORLD LEATHER, Vol. 18, N° 7 (11/2005)  

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Modifying the skin structure / Richard Daniels in WORLD LEATHER, Vol. 18, N° 7 (11/2005)  

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pH related swelling / Richard Daniels in WORLD LEATHER, Vol. 18, N° 4 (06-07/2005)  

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Process vessels : effects within chemical processing / Richard Daniels in WORLD LEATHER, Vol. 18, N° 6 (10/2005)  

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The behaviour of pieces in machine operations as a function of temperature and moisture content / Richard Daniels in WORLD LEATHER, Vol. 18, N° 8 (12/2005 - 01/2006)  

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The machines in the tannery / Walter Landmann / Liverpool [Royaume-Uni] : World Trades Publishing (2003) 

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Water within the skin structure / Richard Daniels in WORLD LEATHER, Vol. 18, N° 3 (05/2005)  

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