Buss Ag

Hans Seipp

Peter Franz

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.

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Pratteln, Switzerland

Hans Seipp