| Titre : |
Leather drying and conditioning |
| Type de document : |
texte imprimé |
| Auteurs : |
Karl Flowers, Auteur |
| Année de publication : |
2023 |
| Article en page(s) : |
p. 60-61 |
| Langues : |
Anglais (eng) |
| Catégories : |
Cuir -- Séchage
Séchoirs
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
A
t the close of the wet-end processing stage of leather making, the leather must be taken through a drying operation that sets the condition of the final article and determines many of the final properties. Many leathers that were well-made in the tanning drum through carefully selected chemistry are ruined in the drying operation because the tanner did not have the best methods (or machinery) for drying and conditioning.
Leather can go through a physical squeezing operation that mechanically removes water prior to drying. These wringing operations are called sammying, setting or sammy/setting and can remove bulkwater found between the fibres, theoretically speeding up the drying process. Extensive work at Fratelli Carlessi has shown that modem toggling processes can eliminate the water removal stage prior to drying - saving time and money.
The drying machine then removes the water in two practical steps: the first phase, removing surface bulk water, and a second phase, the removal of bulkwater and some fibre associated water. Over-drying (a third phase) is avoided through careful control of the end of the drying with a follow-up process called conditioning. Drying and conditioning can be done simultaneously without the need fora separate drying if the moisture control during the process is high.
The leather fibres will be drawn together as the water is removed and they may stick together, resulting in a stiff leather that will need to be mechanically softened to separate the fibres. Again, careful drying and simultaneous conditioning can result in a leather that needs less mechanical softening. In fact, in the second phase of drying, the careful use of humidity can not only help prevent fibre sticking but it can prevent the development of poor looseness that is often seen during uncontrolled drying of wet-white leathers. |
| Note de contenu : |
- Sustainable drying
- Remanufacturing older drying machines
- Looking forward
- Fig. 1 : Cell rotary conditioning (CRC) drying
- Fig. 2 : A reconditioned Fratelli Carlessi machine |
| En ligne : |
https://drive.google.com/file/d/1XJdWw881qoR7j5i_q7vFMBJxAoKtJigm/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39547 |
in INTERNATIONAL LEATHER MAKER (ILM) > N° 59 (05-06/2023) . - p. 60-61
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Leather drying and conditioning in INTERNATIONAL LEATHER MAKER (ILM), N° 59 (05-06/2023)
