Solutions for Press Problems,
   
ColdSet Solution
 
PROBLEM CAUSE SOLUTION
TINTING/TONING:

Adhesion of ink to non-image area of the plate

1.Ink too thin.

2.Improper fountain solution concentration

3.Ink and dampening rollers set too tight to plate

4.Ink is taking on too much water and breaking down.

5.Non-image area of plate has become sensitized and ink receptive.

1.Use ink with more body.Consult ink supplier..

2.Check fountain solution by conductivity to ensure the correct dosage.

3.Reset to lighter pressure to avoid "grinding"pigment into the plate surface

4.Consult with ink and fountain suppliers

5.Use plate cleaner,if toning returns remake plate and check fount strength.

SET-OFF: 1.Too much ink on the paper.

2.Ink is too stiff and will not penetrate into the paper.

3.Paper is not porous enough.

1.Use less ink or switch to a more concentrated ink.

2.Reduce ink viscosity or change ink.

3.Consult paper and ink supplier.

HICKIES:

White spots surrounding a small spot.

1.Particles of dried ink.

2.Paper dust.

3.Dust from overhead objects(lights,

ceiling…)

1.Clean rollers and ink fountain.

2.consult paper supplier.

3.Clean all overhead objects in the work area.

MISTING/SPITTING:

Misting-fine droplets of ink thrown from ink rollers

Spitting-ink being thrown from

Rollers in filaments

1.Too much ink on rollers.

2.Ink too thin.

3.Press speed too high.

4.Improper ink/water balance.

5.Inking rollers are incorectly set or damaged.

6.Roller train is too hot.

1.Reduce ink film or use stronger ink.

2.Use ink with more body.Cosult inksupplier.

3.Reduce speed of press.

4.Reduce ink setting and then water to lower point of ink/water balance.

5.Reset rollers and replace damaged rollers.

6.Increase flow of cooling water.

PILING:

Build-up of paper fibres or ink on rollers,blankets or plates.

.

PAPER:

1.Paper dust.

INK:

1.Ink is over-emulsified.

2.Blanket tack is too high.

3.Ink is too stiff or too tacky.

MECHANICAL:

1.Improper packing of cylinders or rollers not set correctly.

PAPER :

1.Try washing it away by increasing water feed.

INK :

1.Consult ink and fountain solution suppliers to reduce water take-up of ink.

2.Run more water or add non-piling additive.

3.Consult ink supplier.

MECHANICAL : 1.Adjust settings.

PICKING:

Pulling fibres from uncoated or coating from coated papers.

1.Poor quality paper.

2.Impression cylinder pressure too high.

3.Blanket is too tacky.

4.Ink too tacky for paper .

1.Change to a better quality paper with better pick resistance.

2.Reduce impression pressure.

3.Ensure that blanket is washed completely and not tacky after wash cycle.

4.Consult ink supplier.

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