| 摘要 |
In order to ensure, in a method for extracting gases and vapors from plastics granules and powders which are being pre-heated and dried in a drying hopper by a stream of dry air flowing into the lower region of the hopper while the outlet air is extracted from the hopper above the granules, that also that part of the plastics granules which is in the lowermost region of the drying hopper is reliably dried and warmed, the method provides that a portion of the stream of dry air is guided in a direction opposite to that of the main stream and is extracted at the lowermost point of the hopper. A drying hopper for plastics granules is suitable for carrying out the method according to the invention which has in its upper part a feeding opening for the granules and an air outlet pipe, and further has a lower outlet port for the granules and an air inlet pipe which ends inside the hopper in an air distributing opening, wherein a second air outlet pipe is mounted in the hopper near the outlet port.
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