a continuous process for carrying out the process for preparing substantially dust - free thermoset plastic particles from soft plastic mixtures of reactive thermoset plastic - forming materials and volatile components . these soft mixtures which quickly harden after drying are extruded under low pressure and are granulated by cutting while soft . to eliminate excessive amounts of dust the invention uses a premixer and a worm conveyor in a special housing and the conveyor flights are at a low angle of inclination to the horizontal to extrude the soft mixture at low pressure . the soft material at the outlet of the special material is pushed out of the nozzle under a worm rotation which is less than 25 r . p . m . and a pressure is of the order of one pound after which the material is conveyed pneumatically to a cooling station to harden and after cooling is cut into uniform size particles by knives without the formation of dust .