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WORLD LEATHER . Vol. 18, N° 8A study of protein and leather charge / Upgrading-keeping leather's elegance / Micro-balls for better leather aesthetics / Framework for leather manufacture : Essay 10 / TanningTech and Lineappelle reviewed / Commentaries on the subcontinentMention de date : 12/2005 - 01/2006 Paru le : 15/12/2005 |
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Ajouter le résultat dans votre panierProtein and leather charge / J. Guthrie-Strachan in WORLD LEATHER, Vol. 18, N° 8 (12/2005 - 01/2006)
[article]
Titre : Protein and leather charge Type de document : texte imprimé Auteurs : J. Guthrie-Strachan, Auteur ; Karl Flowers, Auteur Année de publication : 2005 Article en page(s) : p. 19-23 Langues : Anglais (eng) Catégories : Anions
Cations
Collagène
Cuir
pH
PolyélectrolytesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : pH is used as a control for charge throughout the collagen or leather structure. This directly influences the penetration and fixation of materials within the matrix. However, the charge of collagen/leather depends on the relationship between pH and pI (lEP). ln practice, the lower the pH in relation to the pI, the greater the positive charge of the collagen/leather, the deeper the penetration of positively charged (cationic) products, and the slower or less secure their fixation. Conversely, the higher the pH in relation to the pI, the greater the negative charge of the collagen/leather, the deeper the penetration of negatively charged (anionic) products, and the slower or less secure their fixation. Moreover, cationic, anionic and neutral materials, which interact with charges on collagen/leather, can also influence pL pI is central to many mechanisms of chemical penetration and fixation, but unfortunately it is difficult to measure. Nevertheless, the direction that chemicals shift the pI, and the effects that this has on leather charge, are essential to an understanding of wet end collagen/leather chemistry. Note de contenu : - The effect of pH on charge
- The effects of change in pI
- The penetration and reaction of chemicals with collagen/leather
- The balance between penetration and fixation
- Managing the penetration and fixation of chemicals
- Panel 1 : The effect of pH change
- Panel 2 : Generalisation of charges on collagen
- Panel 3 : Representation of charges on collagen
- Panel 4 : Representative pI values of collagen and leather
- Panel 5 : Changing the pI
- Panel 6 : Penetration and fixation in relation to pI
- Panel 7 : Charges within neutralisation
- Panel 8 : pI as tool in leathermakingEn ligne : https://drive.google.com/file/d/12qhc92mFWzpxuWmeSn7tYoDFVjMcrWuR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32499
in WORLD LEATHER > Vol. 18, N° 8 (12/2005 - 01/2006) . - p. 19-23[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006188 - Périodique Bibliothèque principale Documentaires Disponible Upgrading keeping leather's elegance / M. Pasquet in WORLD LEATHER, Vol. 18, N° 8 (12/2005 - 01/2006)
[article]
Titre : Upgrading keeping leather's elegance Type de document : texte imprimé Auteurs : M. Pasquet, Auteur ; M. Kurwan, Auteur ; R. Schneider, Auteur Année de publication : 2005 Article en page(s) : p. 25-29 Langues : Anglais (eng) Catégories : Cuirs et peaux -- Défauts
Cuirs et peaux -- Finition
MasquageIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Upgrading' is a widely used term in leather manufacturing today. In general, the term describes a masking or covering process that applies to all sorts of leather surface damage. This process can be a mechanical operation (e.g. sand blasting of the base coat) and/or the use of a special chemical system or product. In most cases, upgrading cases place in the first coats of the finishing process so, for this reason, usually includes sophisticated pre-grounds and base coat applications. Note de contenu : - The importance of upgrading
- The central objective
- Components for the successful upgrade of leathers : The pre-base coat - Pre-bottoms and mill grounds - Pre-grounds and grounds - Mechanically generated foam systems - Compact finishing - Thermo-active fillers - Pull-up oils and waxes - Water-based transfer finishing - Colourants and pigments
- Panel 1 : 1/1 : Production line - 1/2 : Split with release paper - 1/3 : Finished split, taken off from the realised paper
- Table : Summary of the most relevant upgrading finishing products respectively finishing techniquesEn ligne : https://drive.google.com/file/d/1_PCoXRTr0j-brebVPMDkCVuJSHIFNhz3/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32500
in WORLD LEATHER > Vol. 18, N° 8 (12/2005 - 01/2006) . - p. 25-29[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006188 - Périodique Bibliothèque principale Documentaires Disponible Colour fastness of leather to light : xenon lamp in WORLD LEATHER, Vol. 18, N° 8 (12/2005 - 01/2006)
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Titre : Colour fastness of leather to light : xenon lamp Type de document : texte imprimé Année de publication : 2005 Article en page(s) : p. 30 Langues : Anglais (eng) Catégories : Cuir pleine fleur
Cuir teint
Lampe au xénon
Photostabilité
Solidité de la couleurIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : This method is intended for determining the resistance of the colour of leather to the action of a standard artificial light source. The Xenon lamp has an emission wavelength profile close to daylight. In most (but not all) dye suppliera' pattern cards, the values reported are for dyeing on full grain chrome leather. It should be clearly understood that the lightfastness rating obtained will change significantly depending on the type of leather and amount of dye applied. En ligne : https://drive.google.com/file/d/1KVVheSHbfvXaEOHYbC85VkKCusY5tTId/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32501
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Titre : Colour fastness of leather to mild washing Type de document : texte imprimé Année de publication : 2005 Article en page(s) : p. 31 Langues : Anglais (eng) Catégories : Cuir teint
Résistance au lavage
Solidité de la couleurIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Fastness of the colour of leather to hand washing is the resistance to washing under mild domestic laundering in water. When washing leather, changes in colour can occur not only in the leather, but coloured substances may bleed from it and may stain adjacent textile materials.
En ligne : https://drive.google.com/file/d/12AdwCemuH3VwWVXNS6NKZxEvxhheVn9w/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32502
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Code-barres Cote Support Localisation Section Disponibilité 006188 - Périodique Bibliothèque principale Documentaires Disponible The use of micro-balls for low density finishing and better aesthetics for embossed leather in WORLD LEATHER, Vol. 18, N° 8 (12/2005 - 01/2006)
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Titre : The use of micro-balls for low density finishing and better aesthetics for embossed leather Type de document : texte imprimé Année de publication : 2005 Article en page(s) : p. 32- Langues : Anglais (eng) Catégories : Cuirs et peaux -- Finition
EmbossageL’embossage est une technique qui a pour objectif de créer des formes en relief dans du papier ou un autre matériau déformable. L’embossage est la version artisanale de l’emboutissage, qui s’applique le plus souvent à de la tôle.
On distingue deux types d’embossage : l’embossage à froid et l’embossage à chaud. Le premier se pratique avec un kit spécial composé principalement d’une forme dure qui permet de travailler le papier par déformation. Le second nécessite un pistolet chauffant et une poudre ad hoc. La poudre est posée sur le papier en suivant une forme prédéfinie et elle est ensuite chauffée pour lui donner son relief définitif.
L’embossage se distingue du « repoussé » qui est une technique employée en orfèvrerie ou en reliure. Il se distingue aussi du « gaufrage » qui est une technique d'impression.
L’embossage concerne les surfaces planes, au contraire du « repoussage » qui concerne les surfaces de révolution (par exemple : couvercle ou cache-pot en tôle) et nécessite un tour à repousser.
MicrobillesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : For years there has been a problem in leather finishing, which, until now, has not been solved. Conventional, fully finished leathers are compressed when being embossed, especially the surface layers, and this automatically leads to a reduction in thickness, hardening and inferior aesthetics. In order to soften the leathers afterwards they are often milled but, however, a large area of the grain may become loose through this process.
In order to reduce the density of embossed leather finishes, several procedures have been investigated. This includes foam finishing, with air being introduced into the finish to create a foam. But, there are disadvantages, namely that the foam can collapse during embossing, and this can lead to high density characteristics : the foam can also change its density during rouler coat application.
Another investigation included the use of gas separating products similar to those used in the textile coating industry for the foaming of polymers. However, due to the inadequate heat resistance these are not suitable for leather finishing.Note de contenu : - Compact micro-sphere technology
- Applying the technology
- Specific leather applications
- Selection of the binderEn ligne : https://drive.google.com/file/d/1icXlxnsk_9WSIUhUqkZGcdIyLU2c-MQP/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32503
in WORLD LEATHER > Vol. 18, N° 8 (12/2005 - 01/2006) . - p. 32-[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006188 - Périodique Bibliothèque principale Documentaires Disponible 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)
[article]
Titre : The behaviour of pieces in machine operations as a function of temperature and moisture content Type de document : texte imprimé Auteurs : Richard Daniels, Auteur ; Walter Landmann, Auteur Année de publication : 2005 Article en page(s) : p. 36-37 Langues : Anglais (eng) Catégories : Cuirs et peaux -- Effets de l'humidité
Cuirs et peaux -- Effets de la température
Dérayage
Echarnage
Essorage
Mise au vent
Opérations mécaniques
RefendageIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the early mechanical operations much of the focus is on cutting, and for optimum effect the skins must be held flat against the cutting blade or knife. This requires a stretching action for good presentation, which is mainly provided within fleshing and shaving operations by spiral cutting blades on the rotating cylinder. In the splitting operations this is achieved by the helically-grooved gauge roller, and, in part, by the movement of the knife blade, as well as in presentation to the samm/setting operation by the setting cylinder.
Over and above the objective of the operation, stretch is involved at the point of contact between the hide and blade. This action can be considerable, and the physical properties of the skin at that time—especially the ease and degree of extendibility, compression and recovery—strongly affect the outcome of the operation.
Adjustments are made, both to machine settings and presentation, to achieve the best balance of results. But success is a balance between the way force is applied by the machine and received by the skin. It is an equal partnership, but however sophisticated the machine or perfect the application, variations still occur.
The following diagrams provide an insight into the behaviour of mechanically-stressed pieces dependent upon skin condition. Over and above inherent skin variations, as hides and skins progress within manufacture the permutations that generate change increase enormously.Note de contenu : - Panel E10/1 : Presentation of hides and skins to operation versus effect : raw to tanned samm/set condition
- Panel E10/2 : Presentation of hides and skins to operation versus effect : splitting ahd shavingEn ligne : https://drive.google.com/file/d/1V_MmIOJ6_GLHbKQvRevicU4XfplK8UYc/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32504
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