The present invention relates to a system and method suitable for
automatic cleaning of a coating or extrusion head of a coating apparatus.
The invention includes a scrubbing station wherein a combination of
physical contact and strong solvent solution combine to remove coating
fluid from the exterior of an extrusion head. A second cleaning station,
preferably a rinsing station then further cleans the head of coating
fluid and removes solvent used at a first cleaning station. The solvent
used at the rinsing station is preferably self-drying thereby obviating
the need for any further cleaning action. The invention also provides for
the ability to prime the coating bead at the extrusion head so as to have
a fully formed bead ready before the head begins coating a substrate,
thereby providing an even coating across said substrate. The priming
operation preferably comprises holding the head steady over a rotating
priming roller while extruding fluid preferably at a constant volumetric
flow rate. The extrusion head is removed from the priming station when
the coating bead is properly formed, and the extruded coating material is
dissolved in a solvent bath at the priming station. The priming operation
may also be performed at either of the cleaning stations.