Panel forming

摘要

Building panels, especially laminated floor panels are shown, which are provided with a locking system and several core grooves at the rear side in order to save material and decrease weight. Building panels, each having a surface layer on a front side, a backing layer on a rear side and an intermediate core, wherein the intermediate core and the surface and the backing layer all comprise wood fibers and thermosetting resins, said building panels are provided with a locking system for vertical and horizontal locking of a first edge of a first building panel to an adjacent second edge of a second building panel.

主权项

1. A method to produce essentially flat floor panels, each floor panel having a surface layer on a front side, a backing layer on a rear side, and an intermediate core, wherein the surface layer and the backing layer comprise thermosetting resins, and the method comprises:
forming a board with convex pretension so that the board is curved downward at opposite lateral edges of the board, by connecting the core, the surface layer and the backing layer with heat and pressure; dividing the board into several floor panels; and forming core grooves at the rear side of the floor panels such that the convex pretension is at least partly released.