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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)
[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
in WORLD LEATHER > Vol. 18, N° 8 (12/2005 - 01/2006) . - p. 36-37[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006188 - Périodique Bibliothèque principale Documentaires Disponible The effect of splitting and shaving upon some physical characteristics of side upper leather / D. Geoff Hawthorne in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)
[article]
Titre : The effect of splitting and shaving upon some physical characteristics of side upper leather Type de document : texte imprimé Auteurs : D. Geoff Hawthorne, Auteur ; Ross G. Donovan, Auteur Année de publication : 1975 Article en page(s) : p. 56-65 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Propriétés physiques
Fendage
Opérations mécaniques
Rasage
Résistance à la déchirureIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The stitch-tear strength of regular side leather production was evaluated (a) hefore splitting, (h) after shaving, and (c) in the "crust" state. Mullen strength (to grain crack) was ohtained on the same leathers in the "crust" state.
The results were evaluated statistically and a number of significant relationships estahlished. The correlations of primary interest are:
- (a) Thickness hefore splitting vs. stitch-tear strength.
- (b) Thickness after shaving vs. stitch-tear strength.
- (c) Stitch-tear strength after shaving vs. stitch-tear strength in the "crust."
- (d) Mullen strength (crust) vs. stitch-tear strength (crust).
On the basis of these results, estimates can he made regarding the strength of regular tannery production and decisions can be made regarding the disposition of chrome-tanned stock into various types of leather.Note de contenu : - 1. Before splitting
- 2. After shaving
- 3. In the crust state
En ligne : https://drive.google.com/file/d/16vu_ymxS9zE9NSot-7Oj6nvIkQD-aAcW/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38779
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 56-65[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008509 - Périodique Archives Documentaires Exclu du prêt The role of mechanical operations in woolskin production / Barry Jacobs in WORLD LEATHER, Vol. 7, N° 1 (02/1994)
[article]
Titre : The role of mechanical operations in woolskin production Type de document : texte imprimé Auteurs : Barry Jacobs, Auteur Année de publication : 1994 Article en page(s) : p. 47-51 Langues : Anglais (eng) Catégories : Cuirs et peaux de moutons
Laine de mouton
Opérations mécaniques
TeintureIndex. décimale : 677.31 Laine Résumé : In the processing of wool sheep two major problems can occur during the initial stages of process, both being a direct result of excessive mechanical action.
One is cracking of the pelt where the skins have been preserved either by shade drying or by dry salting and the second is felting of the wool.
These problems were originally avoided by soaking in pits, but dressers now tend to use paddles in the early stages of process. In practice, the paddles are used for convenience of handling with a static soak lasting approximately 12 hours to allow the skins to partially wet back. When softened, the paddles can be turned intermittently without the skins cracking, allowing the mechanical action and detergents to increase the rate of soak.
When fully rehydrated, the wool sheep need to be scoured, the process continuing in the same paddle to reduce the grease content of the wool and to a lesser extent the pelt. Fully hydrated, the skins should be able to withstand continuous running for the 1-2 hour process, but the time is closely dependent upon die length of the wool.
Although drums can be slowed down, the level of mechanical action remains high with the increased risk of felting. Another advantage offered by paddles over alternative equipment is the greater ease when handling sheepskins, in partic-ular in the case of dried sheepskins.Note de contenu : - Shearing for uniform wool length
- special attention for good buffing
- The benefits of solvent degreasing
- Consistent dyeings of wool and fleshEn ligne : https://drive.google.com/file/d/1jiMCmvBkmpOsP7_sMrOnCAQuW-fi0W8C/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35172
in WORLD LEATHER > Vol. 7, N° 1 (02/1994) . - p. 47-51[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 008094 - Périodique Bibliothèque principale Documentaires Disponible