Metal fusion bonding – Process – With protecting of work or filler or applying flux
Patent
1990-07-09
1993-08-10
Ramsey, Kenneth J.
Metal fusion bonding
Process
With protecting of work or filler or applying flux
219 1055M, 118622, 118317, 427447, B05D 722
Patent
active
052341569
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a process for the continuous coating of workpieces during which coating procedure a coating medium is applied to a zone to be coated of the passing-through workpiece, and heat is applied in order to produce from the coating medium a film at the zone. The invention furthermore relates to a coating installation for workpieces to be coated in continuous operation, with a coating device with a delivery means for a coating medium and with heating elements in order to produce a film on the workpiece with the coating medium, wherein the delivery means for the coating medium is maintained at a spacing with respect to the workpiece, and furthermore with a conveying means for conveying the workpiece relatively to the delivery means.
BACKGROUND OF THE INVENTION
Processes and facilities for the continuous coating of workpieces have been proposed in U.S. Pat. Nos. 4,549,866; 4,588,605, as well as 4,661,379. Other processes and facilities of the aforementioned type have been proposed in U.S. Pat. Nos. 3,526,027; 2,974,060; 3,077,171; 3,208,868; 3,394,450; 3,678,336; 3,840,138 and 4,098,226; European Laid-Open Applications 93,083; 132,229 and 160,886; as well as DOS 2,724,031.
It is furthermore known to coat workpieces, such as metal can bodies, with powder as the coating medium, for example, along their inner longitudinal weld seam. In this process, such can bodies are moved over a working arm from which powder is sprayed toward the zone to be coated. Customarily, the adhesion of the powder to the can body is electrostatically enhanced in this procedure by producing a high electrostatic field in the spray region and by charging the powder so that the force of the field urges the powder against the can body or the workpiece and retains the powder at those places. Subsequently to this powder coating step, the workpieces, and specifically the aforementioned can bodies, are moved through a long heating station having a length of several meters where the adhered powder is heated to such an extent that it forms a protective film in the coated zone. The length of the above-mentioned heating station depends on the transit velocities of such workpieces and has a length, as mentioned above, of several meters. This is a disadvantage from the viewpoints of the space required for such installations and the structural expenditure.
SUMMARY OF THE INVENTION
The invention is based on the object of drastically reducing the extension of such a treatment route, as well as the space requirement and the construction expenditure for installations operating in this way.
This object has been attained in accordance with the process set forth hereinabove by spraying a synthetic resin toward the transit zone, and applying the heat at least predominantly, prior to impingement of the sprayed synthetic resin, to the zone in order to reduce the extent of the length needed to produce the film.
In accordance with the apparatus set forth above, the object has been attained by fashioning the heating elements so that they heat the coating medium, at least predominantly, before it has passed from the delivery means through the free distance to the workpiece, in order to reduce the extent of the length needed to produce the film.
By spraying the synthetic resin and applying the heat prior to impingement of the sprayed synthetic resin onto the zone of the workpiece, the result is achieved that, downstream of the coating zone, no further heating sections need to be provided whereby in such continuous coating operations, a drastic reduction of the length of the treatment zone and, correspondingly, of the construction expense therefor, is achieved.
Synthetic resin spraying methods are known per se for the spraying of workpieces by means of spray guns in piecemeal individual production. Attention is invited in this connection to a reference by Metco, "Synthetic Resin Spraying" by Sen. Eng. H. Schwarz, revised by Dipl.-Ing. H.-E. Steinicke. The disclosure content of this reference is also incorporated into the
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