A method for forming grooves in a board element. An exemplary method includes arranging the board element in contact with a support member, and forming at least one groove in a rear side of the board element by removing material, such as chips, from the board element by rotating one or more cutting devices including a plurality of tooth elements configured to rotate around a rotational axis. A method further includes counteracting, such as preventing, a displacement of the board element away from the support member during forming of the at least one groove, wherein the counteracting, such as preventing, includes arranging at least a portion of the board element between an obstruction element and the support member.

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.

The invention relates to a multilayer lining plate for essentially horizontal support surfaces such as floors or floor coverings, comprising a main layer having at least two longer sides and two shorter sides, including at least one part, and a ductile upper decorative layer, wherein the lining plate comprises along an outer edge of each of the longer sides of the main layer a ductile machinable portion that can be machined to form a connecting profile for connection of the lining plate with other plates; wherein the at least one part of the main layer is more rigid than the upper decorative layer; and wherein the at least one part of the main layer is made of magnesium oxide, fibrocement or mortar with perlite and/or vermiculite and/or cellulose.

The floor member has a closed-cell foam core that constitutes approximately 50% of the overall thickness of the floor member. All constituents of the floor member, including a design layer, wear layer and resilient foam plastic underlayer, are highly water resistant and essentially water repellant. The closed-cell foam core is relatively lightweight and the floor member is also relatively lightweight compared to equally dimensioned floor planks formed exclusively of solid laminated plastic materials or wood-based laminated materials. The floor member has edge connecting means for convenient floating floor installation without the need to adhere the floor member to a floor base. The floor member is also easy to handle to permit a do-it-yourselfer to install a floor covering with the floor member.

Composite formed boards made of plastic and organic material with a fibrous structure are described. The composite is a foamed mix having a density lower by at least 10% and preferably 20%, than the density of a solid organic-plastic composite made of the same components. The foamed mix is bonded permanently and inseparably with a solid plastic layer, at least from a side opposite to a homogeneous rubber-polyurethane composite. The thickness of the solid plastic layer is smaller than that of the organic-plastic layer (preferably at least five times and most preferably at least fifteen times) and that of the rubber-polyurethane layer (preferably at least fifteen times and most preferably at least twenty-five times). The solid plastic layer may have a grooved structure or an impressed structure with a concavity directed inwardly. The solid plastic layer is preferably bonded with the organic-plastic layer by a co-extrusion joint.

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 fibres 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.

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 fibres and thermosetting resins, the 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.

A multi-level unitary safety surface tile. The tile may be of monolithic construction. The tile may include rubber. The tile may include an upper level and a lower level. Hollow protrusions may extend between the levels. At least one protrusion may include resilient walls extending from the upper layer and converging to a protrusion bottom-cap in the lower level. Inter-protrusion ribs may span between and support adjacent protrusions. With the lower layer disposed upon an underlayer, the protrusions may support the upper level. The tile may attenuate impact forces incident upon the upper layer. The tile may constitute a unitary safety surface. The tile may include structures facilitating interlocking of adjoining tiles into a multi-tile unitary safety surface. Protrusion extensions and/or support ribs may support the structures. The tile may be manufactured in a one-piece molding process utilizing mold forms maintained parallel to opposable faces of a mold press.

The invention relates to a multilayer lining plate (100) for essentially horizontal support surfaces such as floors or floor coverings, comprising a main layer (1), including at least one part made of a rigid or semi-rigid material, and a ductile or flexible upper decorative layer (2). The lining plate comprises in the perimeter of the main layer (1) a ductile machinable portion (3) that can be machined to form a connecting profile for the connection of the plate with other plates. The machinable portion (3) is preferably made of medium-density fiberboard (MDF), a wood-plastic composite (WPC) material or polyvinyl chloride (PVC), and the main layer is of magnesium oxide, fibrocement or mortar with perlite and vermiculite.

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 fibres and thermosetting resins, the 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.