Wischer für Dünnschichtreaktions- oder -verdampferrohr

摘要

1,187,239. Screw conveyer. FARBENFABRIKEN BAYER A.G. 22 Dec., 1967 [27 Dec., 1966], No. 58332/67. Heading B8A. Also in Division B1] A thin layer reaction or evaporator tube 1 for use, for example, in the production of polycondensates, incorporates a coreless elastic helical belt 10 having a surface 17 adjacent to the wall of the tube and in operation facing in the downstream direction which surface is inclined to the wall of the tube at an angle of between 5 and 80 degrees. The belt may also have a deflecting surface 19 on the side facing towards the centre of the tube which in operation faces downstream and is at an angle of between 5 and 80 degrees to the wall of the tube. The inclination of surface 17 and/or surface 19 may vary over the length of the belt. Surface 15 of the belt facing the wall of the tube may have step 16 facing in the upstream direction. Reinforcing webs 12 which may be elliptical or convex lens shaped in cross-section may have a pitch in the same direction as, but greater in magnitude than, belt 10 and may be arranged between the turns of belt 2, 10 with their threads further from the wall of the tube than belt 10. Discharge screw 13 may be continuous with belt 10. In the embodiment of Fig. 3 (not shown), belt 10 on the side facing the centre of the tube has a rounded portion 181.