Board mfr. for heat and pressing - by vapour and gas extn. and air washing in plant attached

摘要

The process used during the press manufacture of boards, extracts the noxious gases and dust, and cleans these out of the airflow. By means of a pump and stages of washing, a fluid is sepd. from the airflow as it passes to the atmosphere. The washing procedure is in two parts to utilise condensation of vapours and gas, and then to intensely clean the airflow. The pressed board (10) lies between two metal conveyors (11, 12) during the pressure and heat operation. The fumes rise into the chamber (14) which has input into an exhaust system (15) with flexible connections (39). The initial wash in the units (16) has fluid delivered by the pump (21) from the tank (20) through pipes (32, 23) and valves (22). This prevents a fire hazard in the extraction pipe (19) which is under suction by the extractor fan (18). The main connection (26) can also be connected to the washing fluid by valve (33). The fluid from the tank (20) may contain an oxidising chemical to neutralise the chemical vapours or gases arising from the pressing process. Before passing through the main connection (26), the mixture may have an addition of coagulant along the pipe (41) supplied by the pump (40). The mixture along the pipeline (19) may have temperature regulation, in order to condense the vapours. The resultant fluid is then extracted in the container (25), and passed back to the tank (20). In the tank there is a water supply level regulator, and solid matter extraction section (34), and a floating mass extraction facility (29). A further possibility is for the extraction fan (18) to have a separate supply of fresh water, to wash the final traces of pollutant from the air before it is allowed to pass to the atmosphere along funnel (36). The water is by passed into the tank (20) from (35). USE - To dispose of pollutants such as paraffin, resins, phenols, formaldehyde, oil vapour and particles of wood, etc. during the hot press stage.