PRODUCTION UNIT FOR FOAMED THERMOPLASTIC SYNTHETIC RESIN, SUCH AS POLYSTYROL, POLYETHYLENE, ETC.

摘要

An apparatus is disclosed for optimizing a method of producing a foam or expanded thermoplastic material, the material usually being mixed with a propellant. The apparatus comprises a filter unit which is disposed between and connects, a fusing and homogenizing extrusion device and a dynamic cooling device. The material is fed into the apparatus at one end of the extrusion device and passes sequentially through the extrusion device, the filter unit and the cooling device. Separate drive means are provided for the fusing and homogenizing extrusion device and the cooling device respectively. Both the extrusion device and the cooling device are disposed on a common longitudinal axis. The connections of the two devices to the filter unit is effected by means of flange mountings. The filter units also includes interchangeable filters which are traversed by the material. In the filter unit, the material flows through a conduit which flares conically outwardly from the filter to the inlet of the cooling device. The extrusion device is so mounted as to permit longitudinal axial thermal expansion and contraction to occur and to permit the extrusion device to be moved away from the cooling device for cleaning purposes.