Patent ID: 8329256
Filing Date: 2012-12-11
Classification: B05B,B29C,B29K

Abstract:
1. Process for the production of mouldings containing a layer of polyurethane in shot operation, comprising a) mixing reactive components of polyol and isocyanate in a mixing head and then b) guiding the reactive mixture produced in step a) through a flow channel of a spray device, c) spraying the reactive mixture leaving the spray device onto a surface of a substrate such that the reactive mixture cures thereon, d) introducing a gas stream into the flow channel of the spray device in two positions, the distance l between those two positions being so chosen that the quotient of the distance l and the diameter d of the flow channel of the spray  is >10, e) the guiding step comprises f) maintaining the gas stream in the flow channel after the reactive mixture has been sprayed in step (c) in order to clean out the flow channel.