[article]
| Titre : |
An appreciation of rollercoating |
| Type de document : |
texte imprimé |
| Année de publication : |
2005 |
| Article en page(s) : |
p. 37-41 |
| Langues : |
Anglais (eng) |
| Catégories : |
Cuirs et peaux -- Finition
Enduction au rouleau
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
The technology of finishing leather by rollercoating has now been under development for some thirty years, having originally been transferred from industries coating rigid, board-like materials. The huge advantage of rollercoating over spraying of finishing pigments, oils and lacquers is in economy of application—a rollercoater only applies the finish to the leather surface, and virtually none is lost or wasted. The continuous development of machinery and finishing chemicals now enables us to use rollercoaters to finish the softest, thinnest leathers produced, both in 'synchro' and 'reverse' coating, for impregnation, base pigment coating, design printing and final lacquering ; in fact, we are now at the point of being able to carry out all these operations with a single, multi-purpose machine.
Let us briefly review the basic principles of rollercoating machinery as used in the leather industry. Pigment, oil or lacquer is applied to a rotating cylinder with an engraved pattern that can `carry' a thin film of the material. Excess material is wiped from the engraved surface by an angled sprung doctor blade, which also serves to form a small reservoir of material against the rotating cylinder. The coating material is pumped to this reservoir, normally by a pneumatic diaphragm pump, and overflows via weirs and catchment trays at each end back to the material container. Leather is carried beneath the engraved cylinder by a rubber roller or a rubber conveyor belt, so positioned as to give a very small clearance beneath the engraved cylinder. When the leather passes through this 'nip' point, material is transferred from the surface of the engraved cylinder onto the surface of the leather. |
| Note de contenu : |
- Coping with soft leathers
- Sophisticated accuracy
- Fig. 1 : A multi-purpose synchro and reverse rollercoater for sides and skins
- Fig. 2 : Synchro coating
- Fig. 3 : Synchro coater with three engraved rollers in rotary turnet
- Fig. 4 : Engraving pattern of a synchro coating roller
- Fig. 5 : Reverse coating
- Fig. 6 : Original engraving pattern of a reverse coating roller
- Fig. 7 : A whole hide reverse rollercoater
- Fig. 8 : Introduction conveyor unit, withdrawn from reverse rollercoater
- Fig. 9 : Engraving pattern of helically grooved reverse coating roller
- Fig. 10 : Three whole hide reverse rollercoaters with driers, linked into a continuous production line
- Fig. 11 : Synchro rollercoater with twelve rollers on rotary turret
- Fig. 12 : Whole hide multi-purpose rollercoater with automatic changeover from synchro to reverse coating
- Fig. 13 : Multi-purpose rollercoater |
| En ligne : |
https://drive.google.com/file/d/1MLiReWJAh1b7NhVzYG0QVvXvRIoaNkkn/view?usp=drive [...] |
| Format de la ressource électronique : |
pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32466 |
in WORLD LEATHER > Vol. 18, N° 4 (06-07/2005) . - p. 37-41
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An appreciation of rollercoating in WORLD LEATHER, Vol. 18, N° 4 (06-07/2005)
