This contribution addresses possibilities of plasma functionalization of different polymer particles to be used in additive manufacturing processes. The purpose of the surface manipulation is to enhance the wettability of single particles and, thus, the coalescence during melting of the particles in order to achieve an improved mechanical stability of parts built by laser beam melting processes. Surface functionalization is achieved by using an atmospheric pressure plasma jet in combination with a fluidized bed reactor. This allows the functionalization of temperature sensitive polymer particles in a reactor concept which can be scaled up for industrial production. To investigate the behavior of the plasma jet, which can be regarded as a secondary injection into a fluid particle bed, a semi-circle set-up was utilized to estimate treatment times of single particles with reactive plasma species. Hereby, different materials (PA12, PE-HD and PP) have been treated and the formed jet volume inside the reactor was measured. The results obtained by this set-up have then been utilized to improve the actual plasma treatment regarding treatment times. The results show that an optimum of treatment time exists for the wetting behavior of particles with water. In a last step, the influence of different plasma feed gases on the wetting behavior of the treated polymer particles has been examined. (C) 2017 Elsevier B.V. All rights reserved.