| 摘要 |
1537139 Mixing apparatus BAYER AG 9 Sept 1976 [13 Sept 1975] 37374/76 Heading B1C Apparatus for mixing the constituents of a plastics foam comprising two liquids and a granular or powder material (e.g. polyisocyanate, polyol and waste foam) comprises containers 20, 21 and metering pumps 24, 25 for the liquids, a screw feeder 29 for the solid material projecting axially into a pipe carrying one of the liquids (e.g. the polyol) and a mixing head 26. The powder and polyol are pre-mixed in the upper part of the mixing head and the isocyanate added in the lower part; in another arrangement, Fig. 3 (not shown), a separate pre-mixer is provided. The screw 3 has a housing 4 coaxial with a shut liquid feed pipe 6, forming a passage 10 of annular cross-section to which liquid is supplied through pipe 7 and annular channel 12. The screw 3 is of increasing capacity towards the discharge end. |
