Gas extraction equipment for removal of volatiles and/or aerosols from cooling plastic during processing has guides for alternating air flow direction with upstream and downstream surfaces at different angles to air flow

摘要

A fan has suction openings(4), an air guiding channel(6) and an outlet(8). The air guiding channel(6) has guides(10) in a conveying section which direct the air flow in alternate directions. Tips(14) of the guides(10) in the air guiding channel(6) have uniform spacing and extend approximately to the middle line(M) of the channel. A fan has suction openings(4), an air guiding channel(6) and an outlet(8). The air guiding channel(6) has guides(10) in a conveying section which direct the air flow in alternate directions. Tips(14) of the guides(10) in the air guiding channel(6) have uniform spacing and extend approximately to the middle line(M) of the channel. Upstream facing surfaces(16) of each guide are at a steeper angle to the air flow than surfaces(18) on the downstream side. The air guiding channel(6) has falling and rising conveying sections. In the transition area between them a collector(22) is provided for fluid precipitation. Surfaces(16,18) of the guides(10) and/or the sidewalls of the air guiding channel may be cooled or heated, preferably alternately.