Powder coating involving compression of the coating during curing
First Claim
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1. A process of forming a coating on a solid substrate, comprising:
- providing a dry, free-flowing powder of a curable material, depositing said curable material on a surface of said substrate to form a layer, heating said layer sufficiently to cause said powder to melt, compressing said layer by pressing it against said substrate by use of a flexible membrane which confines said powder until it has melted and achieved a viscosity sufficient to resist migration on the substrate surface, and fully curing said layer to form said coating on said substrate.
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Abstract
A process of forming coatings on substrates by applying a layer of curable materials in dry powder form and then melting and curing the material is improved by compressing the layer using a flexible confining membrane. Less material is required to provide equivalent barrier protection and surface finish. The process is particularly applicable to applying dry powder coatings on temperature sensitive substrates, such as medium density fiberboard, in press apparatus, such as a membrane press, which have not commercially used dry powder coating materials previously.
87 Citations
58 Claims
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1. A process of forming a coating on a solid substrate, comprising:
- providing a dry, free-flowing powder of a curable material, depositing said curable material on a surface of said substrate to form a layer, heating said layer sufficiently to cause said powder to melt, compressing said layer by pressing it against said substrate by use of a flexible membrane which confines said powder until it has melted and achieved a viscosity sufficient to resist migration on the substrate surface, and fully curing said layer to form said coating on said substrate.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A process of forming a coating on a solid substrate, comprising:
- providing a dry powder of a curable material, depositing said curable material on said solid substrate to form a layer, heating said layer sufficiently to cause said powder to melt, partially curing said layer to cause its viscosity to increase, compressing said layer by pressing it against said substrate by use of a flexible membrane which confines said powder until it has melted and achieved a viscosity sufficient to resist migration on the substrate surface, fully curing said layer to form said coating on said substrate.
- View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A process of forming a coating on a solid substrate, comprising:
- providing a dry powder of a curable material, depositing said curable material on said substrate, heating said layer sufficiently to cause said powder to melt, partially curing said layer to cause its viscosity to increase, pressing a flexible membrane against the surface of said layer on said substrate, and fully curing said layer to form said coating on said substrate.
- View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58)
Specification