[article]
| Titre : |
From ancient craft to stainless future |
| Type de document : |
texte imprimé |
| Année de publication : |
2005 |
| Article en page(s) : |
p. 33-36 |
| Langues : |
Anglais (eng) |
| Catégories : |
Cuirs et peaux -- Appareils et matériels
Foulons
Tannage -- Appareils et matériels
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
Who invented the tanning drum? We would need to go a long , long way back in the history of our industry to find the tanner who first thought that processing could be accelerated by tumbling hides and skins in a chemical solution, rather than simply soaking them in pits. Historians may debate the origins of drum processing, but after a couple of centuries of increasing mechanisation in the tannery, the wooden drum is still alive ans well. Alternative technologies have been developed, and continue to evolve, but in the majority of the world's tanneries the wooden drum still holds sway. Before considering current developments and alternative machinery, it is worth considering the factors that make the wooden drum so successful for its purpose.
The construction of the wooden tanning drum is a scaled-up, heavy-duty development of the ancient craft of barrel making. A watertight vessel is constructed from wooden staves joining two flat ends, clamped in position by circumferential steel bands or hoops. Hardwood is strong and resilient, especially when kept wet; it can resist the twisting stresses as the vessel is rotated, and the shock loads as hides are tumbled and dropped internally. Because wood swells when wetted, wooden vessels are self-sealing, and hardwoods such as teak are very resistant to the agressive chemicals used in the liming and tanning processes. Because of this remarkable fitness for purpose, well-constructed and maintained wooden tanning drums can have service lives of twenty years or more of constant daily use. The only shadow over the future of the wooden drum is the increasing scarcity of the tropical hardwoods needed to produce large vessels - such hardwoods are a finite resource and future supplies cannot be guaranteed indefinitely.Softwoods such as spruce or yellow pine can be used sucessfully for smalller drums up to around 2 metres diameter, but they lack strenght and have a shorter working life. Some manufacturers, such as Italprogetti, have turned to manufacturing large drums from plastics, braced and tied with steelwork like a wooden drum; these are claimed to give comparable strenght to wood with lighter construction, and are very easy to keep clean internally; the material does not absorb any of the float, and there is no possibility of cross-contamination between loads. |
| Note de contenu : |
- Developments in wood
- Gently does it
- The rotating basket
- Fig. 1 : Conventional 4.2 x 4.5 m wooden liming drums with side-sliding manual doors
- Fig. 2 : Conventional 4 x 4 m wooden tanning drum with recirculation filter
- Fig. 3 : Steel braced polypropylene conventional drum
- Fig. 4 : Internal waskboards and pegs in polypropylene drum
- Fig. 5 : "Flat pack" of wooden drum components ready for despatch.
- Fig. 6 : Heavily braced "Cangilones" drum for retanning
- Fig. 7 : Stainless tipping paddles in a shepskin tannery
- Fig. 8 : Large static paddles are losing flavour due to high water usage
- Fig. 9 : The internal spiral of the inclined "mixer" allows controlled unloading
- Fig. 10 : Stainless steel Cangilones drums for retanning / dyeing
- Fig. 11 : Wooden Cangilones drums for liming/tanning
- Fig. 12 : A 3-compartment, "Y" - division dye drum in stainless steel, loading 1,800 kg shaved weight
- Fig. 13 : Unimatik stainless "roating basket" vessel with hydraulic drive and door opening, loading 2,500 kg shaved weight
- Fig. 14 : Vallero Propellor stainless "roating basket" vessel with motorised sliding door, loading 2,000 kg shaved weight
- Fig. 15 : Unloading the Vallero Propellor |
| En ligne : |
https://drive.google.com/file/d/12ubQgG5VNvq1UPm35h3Tv0x-1bvGnnHm/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32334 |
in WORLD LEATHER > Vol. 18, N° 3 (05/2005) . - p. 33-36
[article]
|
Aller sur edunet
Accueil
From ancient craft to stainless future in WORLD LEATHER, Vol. 18, N° 3 (05/2005)
