Apparatus for applying viscous mass to a surface, method for cleaning valves thereof and traffic printer based on such apparatus

摘要

Applicator (11) for application of a viscous mass (31) to a surface (33) comprising a heated chamber (32) in communication with openings (12) controlled by valves (14) allowing dropwise discharge of the viscous mass to the surface. The valves (14) are non-packed and comprise an outer sleeve (15) having at least one through opening (16) in its sleeve wall and valve plug (17) adapted to the internal surface of the sleeve (15). The valve plug (17) is arranged to be moved by means of a valve lifter (18) from a closed position in which the valve plug completely seals the at least one through opening (16) in the sleeve wall, to an open position in which the valve plug (17) is elevated so that at least the lowermost part of the at least one through opening (16) is uncovered and allows viscous mass (31) to pass from the outside of the sleeve (15) to the inside thereof. The invention also comprises a traffic printer comprising a number of applicators as described above, and a method for cleaning same.