[article]
| Titre : |
Embossing and ironing |
| Type de document : |
texte imprimé |
| Année de publication : |
2005 |
| Article en page(s) : |
p. 53-57 |
| Langues : |
Anglais (eng) |
| Catégories : |
Cuirs et peaux -- Appareils et matériels
EmbossageL’embossage est une technique qui a pour objectif de créer des formes en relief dans du papier ou un autre matériau déformable. L’embossage est la version artisanale de l’emboutissage, qui s’applique le plus souvent à de la tôle.
On distingue deux types d’embossage : l’embossage à froid et l’embossage à chaud. Le premier se pratique avec un kit spécial composé principalement d’une forme dure qui permet de travailler le papier par déformation. Le second nécessite un pistolet chauffant et une poudre ad hoc. La poudre est posée sur le papier en suivant une forme prédéfinie et elle est ensuite chauffée pour lui donner son relief définitif.
L’embossage se distingue du « repoussé » qui est une technique employée en orfèvrerie ou en reliure. Il se distingue aussi du « gaufrage » qui est une technique d'impression.
L’embossage concerne les surfaces planes, au contraire du « repoussage » qui concerne les surfaces de révolution (par exemple : couvercle ou cache-pot en tôle) et nécessite un tour à repousser.
Repassage
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
The use of heated hydraulic presses to modify the surface of part-finished leather is a process dating bach over a century, to the introduction of the static platen press to produce smooth, flat surfaces or embossed patterns on the grain surface. These machines have had extraordinarily long working lives, and are frequently modernised with updated and safety interlocks; indded,it is not uncommon for the press to be older than the operators who are feeding it!
In essence, the plate press consists of frame carrying one or two massive hydraulic rams which press the leather against a heated static platen, which can be smooth, shot-blasted or embossed. The earliest machines had cast frames in 'G' or 'O' configuration. The 'G' press had the advantage of operator access to three sides of the platen, but was limited in the pressure that could be evenly applied, and prone to cracking in the frame. The 'O' press, though a little less flexible in use, could apply greater and more even pressure, and it is this configuration is that still under manufacture today.
The modern platen press will probably have a fabricated steel frame, with a single hydraulic ram in its base carrying the work table on which the leather is placed. The table is covered with a felt pad, which compensates for any thickness variation in the leather as it pressed against the platen, and this in turn may be covered with a thin sheet of plastic material to aid sliding the leather in and out. The platen is clamped to an electrically-heated plate fixed at the top of the frame, and may be up to 1600 x 1700 mm in the largest units. The hydraulic pump and oil tank are fixed to the side of the press frame. The ram will normally incorporate internally a small-bore 'pilot' ram to lift the work table rapidly into contact with the platen, when the full-bore pressure of the ram is applied - this reduce the cycle time of each operation. A total force of up to 2,800 tonnes can be applied by the largest presses over the surface of the platen. Interlocked guards are incorporated, so that the table cannot move until the work area is completely fenced off. |
| Note de contenu : |
- Two man operation
- Fig. 1 : Early turned 'G' frame platen press with belt driven hydraulic pump
- Fig. 2 : Modern 'O' frame platen press
- Fig. 3 : Early reciprocating roller press clearly showing the basic design
- Fig. 4 : Modern reciprocating roller press for whole hides
- Fig. 5 : Operator removing hide from rear of a throughfeed ironing machine
- Fig. 6 : Throughfeed ironing & embossing machine for whole hides, with lifting and storage gantry for rollers, and dust suction for felt conveyor
- Fig. 7 : Work rollers on storage gantry, showing swivel connections for heating oil
- Fig. 8 : Whole hide ironing and embossing machine with multi-roller turret
- Fig. 9 : Outfeed of multi-roller machine, with detach roller in raised position |
| En ligne : |
https://drive.google.com/file/d/11EHSMJpozpoaDN9bt5WhrmPmmuhZP8u_/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32345 |
in WORLD LEATHER > Vol. 18, N° 2 (04/2005) . - p. 53-57
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