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|
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FEATHERING
Identify by -
|
Cause
|
Remedy
|
|
Irregular edges around print.
|
Improper pressure between anilox & plate.
Improper setting of ink roller nip.
|
Set proper pressure between anilox roll & plate.
Adjust pressure setting of anilox roll nop.
Check setting of doctor blade.
|
|
|
FOAMING
Identify by -
|
Cause
|
Remedy
|
|
Foam in ink fountain and sump pail
|
Insufficient antifoam in ink.
Too light or close action of ink pump.
Insufficient ink in sump pail.
Over thinning of ink.
|
Consult Pacific Inks for proper defoamer.
Check gears or impellers of pump.
Add more ink.
Add fresh ink to boost viscosity.
|
|
|
INK NOT TRANSFERED
Identify by -
|
Cause
|
Remedy
|
|
Ink not being delivered to board
|
Ink reduced too much.
|
Rebuild viscosity and body of ink
by adding fresh ink.
|
|
|
INK TOO HEAVY
Identify by -
|
Cause
|
Remedy
|
|
Excess Ink on transfer roll
or plates
|
Improper setting of roller nip.
Ink viscosity too high.
Improper ink rollers for ink
transfer.
|
Check rollers for proper setting.
Adjust viscosity to recommended
level.
Consult specification of roller
manufacturer.
Add fresh ink to boost viscosity.
|
|
|
PRINT MOTTLING
Identify by -
|
Cause
|
Remedy
|
|
Spotted or indistinctive
appearance to print.
Weak colour strength.
Grainy solids
|
Ink too weak.
Bad surface plates.
Foreign matter on surface
of plates.
|
Use fresh ink.
Bring viscosity to recommended
level.
Remake plates.
Clean plates.
|
|
|
PRINT SMEAR
Identify by -
|
Cause
|
Remedy
|
|
Smear marks on board.
|
Excessive ink application
Clean plates.
Lower the viscosity of the ink.
Install pull straps.
Check pressure of roller
|
Clean and replace doctor blades.
Clean plates
Lower the viscosity of the ink.
Install pull straps, check pressure of roller
|
|
|
PRINT SMUDGE
Identify by -
|
Cause
|
Remedy
|
|
Print shows smudge or heavy edge.
|
Improper impression setting.
Flooding ink nip.
|
Correct plate and ink rolls to kiss
impression.
Tighten ink nip.
|
|
|
SKIP PRINT
Identify by -
|
Cause
|
Remedy
|
|
Areas of plate failing to print.
|
Poor plates or make ready.
Impression set to light.
Failure to lock down deck.
Plate cylinder bounce.
|
Check impression to determine
accuracy of plates.
Readjust impression settings.
Check dead locking nuts.
Check concentricity of plate
cylinder or gears..
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