Mechanical locking system for floor panels

A method for making a mechanical locking system between two edges of a first and second panel containing a wood fiber based core, the method comprising embossing the locking system to form protrusions in the wood fiber based core for locking the panels in a joint direction parallel to a horizontal plane of the panels and parallel to the joint edges to inhibit movement of the first and second panels relative to each other in the joint direction when a continuous tongue of the second panel is fully connected with a corresponding continuous groove of the first panel, wherein, when the panels are fully connected, upper surfaces of the panels are parallel to each other in a common plane and the panels are locked together in a vertical and a horizontal direction by the continuous tongue and groove, wherein the locking system is formed at least partly in the core, wherein the embossing forms protrusions that are substantially perpendicular or angled with relation to the joint direction;

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• wherein a sidewall of a protrusion of the first panel contacts a sidewall of a protrusion of the second panel to prevent displacement in the joint direction.