Patent ID: 7740042

Claim:
A vibration-welding apparatus using the friction welding technique for a continuous production of geogrids having thermoplastic bars which cross one another forming a multiplicity of crossing areas arranged next to and behind one another which are intermittently welded simultaneously, wherein the vibration-welding apparatus includes a take off unit for taking off longitudinal bars; a laying head for furnishing of transverse bars running transversely relative to the longitudinal bars; a plurality of vibration-welding devices, which are set up next to one another each vibration welding device is equipped with a corresponding control and pressure system; a vibration plate, which has a large surface area and which is used to weld at least 100 crossing areas simultaneously; a bottom tool, which is positioned on a welding bench and which, in order for welding to be carried out, is raised by means of 4 hydraulic cylinders; a separating comb, which is used in the area of the welding tool in order to guide the plastic bars; wherein all vibration welding devices are made to vibrate simultaneously under equal pressures and amplitudes and frequencies.