CAREPRINT LOGO
CAREPRINT LOGO
CAREPRINT LOGO

FAQ

FAQ.

FAQ
factors_affecting_print

What Factors influence obtaining Quality Print?

From the facts mentioned so far, it becomes evident that the result of printing is influenced by a multitude of factors. Experience shows that the root cause of a faulty print is virtually never to be found in the mechanics of the printing press.

Defects in the Pad Printing Machine itself are nearly always obvious, clearly definable and can be remedied by the technicians of the manufacturer. Hence, this issue can be ignored. To eliminate problems connected with printing, it is of greatest importance to describe deficiencies in as detailed a way as possible.

Any Pad Printing technician has difficulties on the telephone when a customer makes statements which are only general in nature. Not even the best technician can be of assistance when simply told “the press won’t print” or “the quality of the print is poor.”

Sources of Deficiency in getting Optimal Printing Results

Deficiencies most commonly found in printed material:
– no opacity
– misregister
– motif distorted
– blurring
– poor leveling of ink
– problematic overprintability in multi color prints
– color does not correspond with artwork
– spiderweb effect on contours
– screen dots are visible/are not visible
– fine lines run together
– large areas not completely covered
– small bubbles (pinholes) visible
– motif smudged
– ink does not adhere to substrate
– desired grade of gloss cannot be achieved

During printing operation:
– pad does not pick up ink
– no deposit or only partial deposit of ink by pad

A number of additional problems arise, which are, however, very particular to the individual areas:

Pre-operational deficiencies, e.g.:
– inadequate pre-treatment
– no or only partial deposit of ink on substrate

Post-operational deficiencies, e.g.:
– ink/color turns after some time
– ink cannot be lacquered
– ink does not adhere to substrate

Containment of Deficiencies

In order for any problems which arise to be contained quickly, the individual components (e.g., substrate, pad, cliche and ink) should be systematically changed or replaced.

The settings of the Pad Printing Machine and the ambient conditions (humidity!) should be checked. Making individual sample prints at a higher or lower printing speed or blowing on the pad can also be helpful.

Description of Problems and Proposed Solutions

Spots of poor ink pickup by pad in Pad Printing Machine?

Potential Problems in Printing – Description of Problems and Proposed Solutions

ProblemSolution
1. Too thick.1. Add thinner.
2. Dried out.2. Clean cliche with thinner.
3. Wrong thinner.3. Use slower thinner or one suited to ink system.
ProblemSolution
1. Insufficient etching depth.1. Produce new cliche with greater etching depth.
2. Wrong screen ruling.2. Test new cliche with different fineness of halftone screen.
3. Surface physically damaged.3. Use new cliche.
ProblemSolution
1. Too flat.1. Use more tapered pad shape.
2. Surface roughened.2. Replace pad.
3. Pad swollen.3. Blow air on pad.
4. Surface too oily4. Clean pad (several times) or replace.
ProblemSolution
ProblemSolution
1. Too thick.1. Add thinner.
2. Dried out.2. Clean cliche with thinner.

If ink pulls on pad fibers during pickup, it is too thick and needs thinning.

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Poor (spotty) release of ink by Tampon in Pad Printing Machine?

Potential Problems in Printing – Description of Problems and Proposed Solutions

ProblemSolution
1. Dried out on pad.1. Use slower thinner.
2. Too wet on pad,not tacky.2. Use faster thinner.
ProblemSolution
1. Insufficient etching depth.1. Produce new cliche with greater etching depth.
2. Etched too deeply.2. Produce new cliche with shal-lower etching depth.
3. Wrong screen ruling.3. Use new cliche with different fineness of half-tone screen.
ProblemSolution
1. Wrong shape pad.1. Use more tapered pad shape.
2. Surface rough-ened.2. Replace pad.
ProblemSolution
1. Soiled surface(grease, oil, per-spiration, mold release agents..).1. Pre-clean objects.
2. Surface insufficiently pre-treated (polyolefins).2. Check pre-treat-ment, repeat as required.
ProblemSolution
1. Print speed set-ting too slow.1. Maintain uniform cycle time.
2. High ambient(room) temperature.2. Optimal room temperature is 18 °C – 20 °C or 65 °F – 68 °F

ncomplete or spotty deposit of ink by pad is referred to as “splitting.” It plays a minor role in a continuously running process. The problem only arises when cycle times fluctuate or after short breaks. The pad deposits the dried ink all at one time, producing an inconsistent image. Using fast thinners will decrease ink build-up and improve ink deposition.

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