Abstract: An ink supply system for a continuous ink jet printer gun body must allow solvent to be added during printing, and known systems are complex, requiring a pair of pumps, the output pressure of at least one of which is critical. Accordingly, to overcome these problems, an ink supply system for such a printer comprises a pump (9) for pressurising ink and air received from a gutter (8) of the printhead to a pressure above that required for ejection of the ink from the gun body (10) and an ink reservoir (1) from which fresh ink may be fed to the pump (9). The system has first (12) and second (19) chambers in combination with air space (13) and valves (14,15,25), provided for maintaining pressurised air above ink in the first chamber (12) and for controlling the pressure of air above ink in the second chamber (19). Conduit (21) is provided for supplying ink from the second chamber (19) to the printhead.

Abstract: Hectorite is utilized in conjunction with a water soluble cationic coagulant to clarify waste water from the deinking of waste paper.

Abstract: A method of dispersing warm fog by forming a hygroscopic solution composed f urea and ammonium nitrate in water and spraying said solution into the fog cloud to be treated.