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Microscopical studies in leather manufacture / David Langridge in WORLD LEATHER, Vol. 15, N° 6 (10/2002)
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Titre : Microscopical studies in leather manufacture : Part 1 of 4 : Raw materials Type de document : texte imprimé Auteurs : David Langridge, Auteur Année de publication : 2002 Article en page(s) : p. 70-72 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Animaux domestiques -- Parasites
Cuirs et peaux -- DéfautsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Animal husbandry practies and their effects upon leather quality are increasingly important areas of research within the leather industry. The work carried out in this field includes correlating parasitic infestation with types of leather damage, and demonstrating the positive correlation between parasite free animals and leather quality, yield and value.
One of the most common types of damage seen on leather is known as light spot or fleck. These are small areas of grain enamel damage which, when dyed, are visible as a lighter colour than the normal regions of the grain due to differential dye uptake. Lightspot, refers to damage 1-3 mm in diameter whilst fleck refers to areas of less than 1 mm.
One of the major difficulties with light spot and fleck damage is the very small area it covers, making it very difficult to see until the leather has been dyed and subsequently dried. As leather is graded after tanning this results in many hides processed for aniline finishing being subsequently downgraded due to hide defects.Note de contenu : - Damage due to lice and stable fly
- Damage due to ticks
- Fig. 1 : Long nosed sucking louse (Linognathus vituli) viewed from the side.
- Fig. 2 : The biting louse (Bovicola bovis) still attached to hair.
- Fig. 3 : The biting louse viewed head on with stage tilted 60° to show the claws and the mouth - claw highlighted.
- Fig. 4 : Stable fly head showing the proboscis used to penetrate the skin, examined with the stage tilted 75°.
- Fig. 5a : Superficial light spot damage caused by lice showing grain enamel erosion.
- Fig. 5b : Light spot damage with distinct boundary edges.
- Fig. 6a : Tick attached to wet blue with the proboscis penetrating into the leather.
- Fig. 6b : Proboscis in detail as it penetrates into the leather, showing the nodules which are believed to secrete an anzyme which aids its penetration into skin.
- Fig. 7 : Tick proboscis in a crosssection of wet blue. Note the barbs used to keep the tick attached to the host.
- Fig. 8 : Disruption caused to the grain surface of wet blue when the proboscis is removed.En ligne : https://drive.google.com/file/d/1-eOHv66NYucTekp-mpavzLNT7HJrbh9u/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32271
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