Biuged Laboratory Instruments BGD 626, Instruction Manual, Page: 4 / 7

Control Panel
4. Trouble Shooting
4. 1. Sample printed by the Multi-section Ink Proofing Press are not coherent with those from
printer
Reason Examination & Solution Reference Column
Roller platens
are unclean.
Examination: stop the machine before filling ink; erase the platen
by using a white cloth with solution to examine whether the cloth is
dyed. The color of frontal part is nonuniform from the hinder part or
there is sand holes on the platen are the unexpected situations.
Solution: wash the platen by using abluent, or scour it repeatedly.
Primary Cause
Non-uniform
thickness of
ink-layer.
Examination: observe by eye or test by instrument
Solution: control the quantity of ink during proofing process.
Test the quality control bar by
spectrophotometer and by eye.
Ink is not
dispersed
homogeneously.
Solution: extend the distributing time or improve the distributing
method.
The proofing ink is not coherent
with the ink in duck
The water in
tank is unclean.
Examination: observe by eye when it is contained by a transparent
container.
Solution: change water.
Obvious effect on the light or
bright color
Ink is oxidized.
Examination: measure pH value by using pH meter; measure roller
platen temperature by using infrared radiation thermometer.
Solution: adjust pH value, conductivity, water shortage or roller
platen temperature.
In general, the () is active, the
other ink is inoxidable.
Ink is over
emulsified.
Examination: measure ink emulsifiability by using emulsification
tester.
Solution: adjust pH value, conductivity, water shortage, roller
platen temperature or change appropriate ink.
Caused by the insufficient water
since the constantly contact
between ink and fountain solution.
Generally, the hue is not hugely
affected, but the ink will become
3% shallower.