Installation Check Items; Print Head Air Purge - Hitachi UX2 Technical Manual

3. Installation Check Items

3.1. Print Head Air Purge

When you use the IJ Printer under the operating conditions described in
"(1) Conditions under which air purge is required" below, electrical leakage
may occur inside the print head, resulting in malfunction of the printer due
to electrical errors. In this case, air purge inside the print head will enable
the printer to operate normally.
(1) Conditions under which air purge is required
Below is the conditions under which air purge is required.
● When the printer is used in a high-humidity environment, such as a beverage can or beer can line (Perform
air purge when using it in the 85 % RH or higher humidity environment.)
● When a water drainage blow sequence is performed before printing
● When you use the printer in an environment with a lot of paper powder or dust
● When the end of the print head becomes dirty because the distance between the print head and the target is
too close and ink splashing occurs
● When you use the ink for which the need for air purge is described in the handling guidance of each ink
(2) Air purge method
Put clean dry air of about 0.1 to 0.3 MPa from the print head air purge connection port [Rc1/8 (PT1/8) x
screw] on the back of the unit. Use an air filter or micro mist separator to convert air possibly containing oil
and water to clean dry air before putting it into the IJ Printer.
Air-purge connection port
[The air-purge connection port is made of
resin. Note that overtightening the connection
port with a metal joint can damage the resin
hole and cause the port to slip (maximum
tightening torque 1.5 N
Air source
(clean dry air, with a
capacity of about
1 L/min)
[Note]
An excessive amount of purged air causes printing disturbance. After adjusting the air purge pressure, be
sure to perform the test print and check the printing state.
12
m).]
●
Pressure gauge
0.1 to 0.3 MPa
Pressure-reducing
valve
Air-purge connection port