Method for forming a gellified polyurethane layer on a surface
AssigneeGechem and Recticel
InventorsJacques Verwilst, Hugo De Winter, Andre Braeckman, Bernard De Baes
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Abstract
Method and device for forming a gellified polyrethane layer on a surface, notably of a mould, by spraying a liquid reaction mixture comprising polyol and isocyanates and which has a viscosity between 20 and 2000 centipoises. The mixture is sprayed in the form of a film of liquid and/or raindrops of which the main part has a mean diameter (Medium Volume Diameter; "M.V.D.") which, according to the standards ASTM E 779-81, is larger than 100 microns and preferably larger than 500 microns.
Claims10
A method for forming a gellified polyurethane layer on a surface by spraying a liquid reaction mixture comprising polyol and issocyanates and having a viscosity between 20 and 2000 centipoises, said mixture being sprayed in form of a film which extends in the shape of a surface of a cone and which, depending on the spray distance, reaches said surface as a film or is broken up into drops before reaching said surface, said drops having a mean volume diameter which according to the standards ASTM E 779-81, is larger than 100 microns and smaller than 5000 microns.
A method for forming a gellified polyurethane layer on a surface by spraying a liquid reaction mixture comprising polyol and isocyanates and having a viscosity between 20 and 2000 centipoises, said mixture being sprayed in form of a film which is broken up into drops before reaching said surface, said drops having a mean volume diameter which according to the standards ASTM E 779-81, is larger than 100 microns and smaller than 5000 microns.
Dependencies are inferred from the claim text.