Method and system for applying particulate solids on a substrate
The present invention relates to a method for spraying particulate solids onto a substrate, comprising the steps of: coating the substrate with a wet and/or adhesive synthetic resin layer, building up a gas pressure in a line, generating a pressure differential in the line, swirling and carrying along particulate solids in the line, ejecting swirled, particulate solids from the line onto the surface of the wet and/or adhesive synthetic resin layer of the substrate. The invention also relates to a substrate, in particular a wood-based panel or decorative paper, at least partially coated with a particulate solid, characterized in that the particulate solid is applied to the substrate with an accuracy of up to ±0.8 g/m 2 , preferably of up to ±0.5 g/m 2 , particularly preferably of up to ±0.3 g/m 2 , preferably of up to 0.1 g/m 2 .
1. A substrate which is at least partially coated with synthetic resin containing a particulate solid (k), wherein the particulate solid (k) is applied to the substrate with an accuracy of up to ±0.8 g/m2.
2. The substrate of claim 1 , wherein a further synthetic resin layer is applied to the synthetic resin containing the particulate solid (k).
3. The substrate of claim 1 , wherein the substrate is a wood-based panel or decorative paper.
4. The substrate of claim 1 , wherein the accuracy is up to ±0.5 g/m2.
5. The substrate of claim 1 , wherein the accuracy is up to ±0.3 g/m2.
6. The substrate of claim 1 , wherein the accuracy is up to ±0.1 g/m2.
7. The substrate of claim 1 , wherein the particulate solids have a specific weight of at least 2 g/cm3.
8. The substrate of claim 1 , wherein the particulate solids have a specific weight of at least 3 g/cm3.
9. The substrate of claim 1 , wherein the particulate solids have diameters of 30 to 100 μm.
10. The substrate of claim 1 , wherein the particulate solids have diameters of 40 to 60 μm.
11. The substrate of claim 1 , wherein the particulate solids are embedded in a layer of the synthetic resin on the substrate.
12. The substrate of claim 1 , wherein the substrate is substantially uniformly coated with the particulate solids.
13. The substrate of claim 1 , wherein the particulate solids are particles of corundum.
14. The substrate of claim 13 , wherein the particulate solid is present on the substrate in an amount up to 100 g/m2 with a precision of coating of up to ±0.8 g/m2.
15. The substrate of claim 13 , wherein the particulate solid is present on the substrate in an amount up to 80 g/m2 with a precision of coating of up to ±0.5 g/m2.
16. The substrate of claim 13 , wherein the particulate solid is present on the substrate in an amount up to 50 g/m2 with a precision of coating of up to ±0.3 g/m2.
17. The substrate of claim 13 , wherein the particulate solid is present on the substrate in an amount up to 30 g/m2 with a precision of coating of up to ±0.1 g/m2.