Abstract: Selection machine for wood-type waste products to produce panels which comprises a delivery hopper and a conveyor belt on which a flow of wood material to be selected advances.

Abstract: Machine and method to separate wood-based materials from other materials. A conveyor belt conveys the group of materials to be separated toward detection members that detect the presence of materials with an organic origin and/or metal materials. Compressed air nozzles selectively thrust downward the materials with an organic origin and/or the metal materials detected by the detection members, under the control of an electronic control unit. A blowing device is disposed downstream of the nozzles to blow air toward the wood-based materials that transit due to inertia above them and thrust them beyond a separation element disposed downstream of the blowing device, while the inert materials, which have a bigger specific weight than the wood-based materials, fall downward due to gravity.

Abstract: The present invention refers to a linear compressor comprising a piston (9) arranged slidably inside a cylinder (15); in said cylinder (15) the 15 piston (9) defines a first low-pressure chamber (21) and a second high-pressure chamber (22), said piston being further provided with communication means (23) between said first and said second chamber (21, 22), which are controlled by valve means (24) to establish such communication therebetween.