Patent ID: 8292982
Filing Date: 2012-10-23
Classification: B01D,B33Y

Abstract:
1. Process for producing a filter; the process comprising the steps of: a) forming a three-dimensional mathematical model, which comprises a cell structure defining a filtering porous portion of said filter and has cells corresponding to respective pores to be obtained in said porous portion; b) applying powder having the same composition as said porous portion and having a grain size lower than a porosity to be obtained, in order to define a horizontal layer of powder having a substantially constant thickness; c) locally melting the powder of said layer by means of energy beam scanning in order to form a section of said porous portion according to a level of said three-dimensional model; d) lowering the upper surface of the formed section to a predefined position; e) repeating the steps from b) to d) until all the sections of said porous portion have been formed; f) eliminating the residual powder from the pores of the formed porous portion; wherein the process comprises the further step of forming at least one reinforcing ring together with said porous portion, by repeating the steps from b) to d) for a given number of times; said reinforcing ring being defined in said three-dimensional model, and being made from a solid and non-porous material integral with said porous portion and arranged along an edge of said porous portion.