Method for coating a tile element

A method for coating a tile element, the method comprising:

• providing a tile element made of a compressed fiber material having a porosity in in a range of from 0.92 to 0.99, the tile element having two opposite major surfaces;
• and
• applying a water-based coating material to a side edge surface of the tile element extending between the two opposite major surfaces,
• wherein the applying the water-based coating material is performed by an applicator head of a continuous vacuum coating apparatus, the applicator head being configured to apply the water-based coating material to the side edge surface of the tile element and to remove excess of the water-based coating material through a vacuum,
• wherein the water-based coating material is applied at a feeding rate of the tile element relative the applicator head of the continuous vacuum coating apparatus in a range of from 50 to 150 m/min,
• wherein the water-based coating material is applied to the side edge surface such that a coating layer is formed comprising an outer coating layer extending beyond the side edge surface and an inner coating layer penetrating the side edge surface and extending into the tile element, and
• wherein the inner coating layer is given a penetration depth of at least 100 μm.