Method of and system for cleaning off ink in flexographic printing machine

摘要

It is an object is to improve the cleaning effect, to reduce the cleaning time, and to reduce the consumption of cleaning water during cleaning of an inside of an ink chamber of a flexographic printing machine. For cleaning an ink chamber 20, purge air “a” is supplied from pipes 46a-b to the ink chamber 20, and an ink “f” is collected from an ink supply pipe 26 and an ink recovery pipe 36 to an ink can 30. Subsequently, cleaning water “w” is supplied from the pipes 46a-b to the ink chamber 20, as well as defining a cleaning water circulatory passage 44 constructed from a three-way valve 24, an ink supply port 22, the ink chamber 20, excessive ink recovery ports 32, the ink recovery pipe 36, and a connecting pipe 40 for circulating cleaning water “w” through the circulatory passage 44 to clean inside the ink chamber 20. At the same time, compressed air “a” is supplied from a compressed air supply pipe 424 of an air gun 42 to generate bubbles in the cleaning water “w”, thereby improving the cleaning effect on the ink chamber 20 by the agitating action and the turbulent flow generating action of the bubbles.

主权项

1. A method of cleaning off an ink in a flexographic printing machine, wherein a flexographic ink is supplied to an ink chamber facing an outer peripheral face of an anilox roll, and the flexographic ink is transferred from the anilox roll to a printing die wound about a printing cylinder, the method comprising:
after removing the flexographic ink from the ink chamber, supplying a multiphase fluid to the ink chamber by a multiphase fluid generator, to generate a pressure difference between two ends of the ink chamber in a longitudinal direction of the ink chamber by means of a discharging action of the multiphase fluid generator, the pressure difference generating a one-directional flow of the multiphase fluid in the longitudinal direction of the ink chamber, to clean the ink chamber by means of a cleaning action of the multiphase fluid, the multiphase fluid containing a gas or minute granular solids in two or more liquids or a liquid; wherein first air is supplied into the multiphase fluid by the multiphase fluid generator before the multiphase fluid is supplied to the ink chamber, and second air is supplied into the multiphase fluid discharged from the ink chamber by a pressure difference generating device to generate the pressure difference between the two ends of the ink chamber in the longitudinal direction of the ink chamber.