Abstract: The invention refers to a method and an apparatus for fabricating a tridimensional solid object by sintering inorganic particles of controlled size distribution. The particles are directed onto a target area in a powdery stream in the shape of a conical surface which is coaxial to a simultaneous heating flux while an at least bidimensional relative movement is maintained between the target area, the powdery stream and the heating flux. As a result the particles sinterization occurs in a single operation directly onto the target area.

Abstract: The invention is based on the use of high-energy grinding mills for treating by combined mechanical and chemical action materials comprising one or more polymers in the liquid state thereof, in view of modifying the chemical/physical performance properties thereof. The polymers may be treated in the mill either alone or mixed with other materials, even non-polymeric organic or inorganic ones, which may themselves be either in liquid form or in the form of particles. An elastic transpiring membrane and an additive for protective coatings for wooden surfaces are specifically indicated and claimed as typical products among a variety of products that can be obtained with this method.