Device for managing printing solution in printing machine

1. A device for managing a printing solution in a printing machine that carries out printing while circulating the printing solution through a circulation route, the printing solution containing a resin component to be transferred onto a surface to be printed and a surfactant, the device comprising:

a liquid supplier that supplies the printing solution containing foam generated in the circulation route with a viscosity adjusting solution for controlling the viscosity of the printing solution to break the foam,

wherein

the circulation route comprises

a tank that stores therein the printing solution and that is used for controlling therein the viscosity of the printing solution, and

a filter disposed at an entrance of the printing solution reclaiming to the tank, the filter being configured to catch the foam contained in the printing solution that flows into the filter, and being configured to drop liquid-form components of the printing solution,

the liquid supplier comprises a spray nozzle that sprays the viscosity adjusting solution onto the foam caught in the filter,

the filter is installed in an auxiliary tank disposed at an upper portion of the tank, and

the auxiliary tank includes an ejector formed at a lower portion thereof, and through which the printing solution dropped through the filter flows into the tank.

2. The device according to claim 1 , wherein the circulation route further comprises:

a printing solution fountain that stores therein the printing solution in the vicinity of a point of performing printing;

a supply pipe that supplies the printing solution from the tank to the printing solution fountain; and

a reclaiming pipe that reclaims an excess of the printing solution from the printing solution fountain to the tank.

3. The device according to claim 2 , wherein:

the printing solution fountain is segmented by outer circumferences of two adjacent rotating rolls;

the device further comprises two printing solution reclaiming pans being disposed at the both ends of the two rotating rolls along the axis direction of the rotating rolls; and

the liquid supplier further comprises spray nozzle that sprays the viscosity adjusting solution to the printing solution flowing from the printing solution fountain and temporarily stored in the respective printing solution reclaiming pans.

4. The device according to claim 2 , wherein:

the printing solution fountain is segmented by part of an outer circumference of a rotating roll, a blade being in contact with the rotating roll, and end seals opposing to the rotating roll; and

a liquid supplier that supplies the end seals with the viscosity adjusting solution is disposed.

5. The device according to claim 1 , wherein:

the tank includes an inner wall upwardly inclined to the vertical direction;

the ejector of the auxiliary tank is arranged such that the printing solution runs on the inner wall and then flows into the tank; and

the auxiliary tank has a bottom downwardly inclined towards the ejector.

6. The device according to claim 5 , wherein the ejector points to the inner wall and is in a vicinity of the inner wall so that the printing solution flows out of the bottom through the ejector, runs on the inner wall, and flows into the tank.

7. The device according to claim 1 , wherein the liquid supplier intermittently supplies the viscosity adjusting solution.

8. The device according to claim 1 , wherein

the printing machine is a flexographic printing machine that uses water-based flexo ink as the printing solution and uses water as the viscosity adjusting solution; and

the circulation route comprises the tank configured to be an ink supply source, an ink fountain in contact with the surface of an anilox roll, an ink supply pipe that supplies the flexo ink from the tank to the ink fountain, and an ink reclaiming pipe that reclaims an excess of the flexo ink from the ink fountain to the tank.

9. A method for managing printing solution in a printing machine that carries out printing while circulating the printing solution through a circulation route, the printing solution containing a resin component to be transferred onto a surface to be printed and a surfactant, the method comprising:

supplying the printing solution containing foam generated in the circulation route with a viscosity adjusting solution for controlling the viscosity of the printing solution to break the foam;

dropping the printing solution flowing through the circulation route into a temporary reservoir; and

passing the printing solution through a filter catching the foam contained in the printing solution that flows into the filter, the filter dropping liquid-form components of the printing solution,

wherein the viscosity adjusting solution is sprayed to the foam caught in the filter to break the foam.

10. The method according to claim 9 , further comprising:

reclaiming the printing solution to an end (or both ends) of a space being segmented by outer circumferences of two adjacent rotating rolls on the circulation route;

temporarily storing the printing solution in the end (ends) of the space; and

supplying the viscosity adjusting solution to the printing solution temporarily stored in the end (ends) of the space to break the foam.

11. The method according to claim 9 , further comprising supplying the viscosity adjusting solution to points being in slidable contact with end seals disposed on ends of a space that stores the printing solution on the circulation route.