Method of coating with film-forming solids
First Claim
1. A method of coating a surface with film-forming solids comprising:
- first forming a stream of relatively stable liquid foam composition containing film-forming solids,then applying an external atomizing force to said stream to disintegrate said foam and to atomize said foam into atomized particles of said film-forming solids, andconveying the atomized foam particles to form a film of said solids on said surface.
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Abstract
Surface coating methods and apparatus are disclosed which eliminate many of the disadvantages associated with known coating processes from pollution, equipment, materials, energy, labor and cost standpoints. According to techniques described, liquid compositions containing film-forming solids are formulated, then conveyed in the foam state towards a surface, and upon foam disintegration, form a film of solids on the surface. The techniques disclosed eliminate the need for solvents in paints or reduce volatile content to very minimal amounts. This method also enables polymeric compositions having high molecular weight to be employed as coating materials. Furthermore, the method has utility in nearly all coating processes where the film-forming solids are conveyed from a bulk state to a surface for coating.
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Citations
39 Claims
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1. A method of coating a surface with film-forming solids comprising:
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first forming a stream of relatively stable liquid foam composition containing film-forming solids, then applying an external atomizing force to said stream to disintegrate said foam and to atomize said foam into atomized particles of said film-forming solids, and conveying the atomized foam particles to form a film of said solids on said surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method of coating a surface with film-forming solids comprising:
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first forming a stream of relatively stable liquid foam composition containing film-forming polymeric solids, wherein said foam consists essentially of a polyhedron state, then applying an external atomizing force to said stream to disintegrate said foam into atomized particles of said film-forming solids and spraying said composition towards said surface, and forming said film-forming solids on said surface as a continuous film. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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35. A method for coating a surface with film-forming solids comprising:
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providing a liquid composition containing thermosetting film-forming solids and a liquid foaming agent, heating said composition to a flowable solubilized state, conveying said composition, forming a stream of relatively stable liquid foam composition wherein the ratio of volume of said composition occupied after foaming to volume occupied before foaming of said liquid ranges up to about 50;
1 by volume,then applying an external atomizing force to said stream to disintegrate said foam into atomized particles of said solids composition, spraying said atomized composition towards said surface, disintegrating said foam during said conveyance, and collecting said solids on said surface for the formation of a film of said solids on said surface. - View Dependent Claims (36, 37, 38, 39)
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Specification