Potential Problems in Printing – Description of Problems and Proposed Solutions

1. Dried out on pad.1. Use slower thinner.
2. Too wet on pad,not tacky.2. Use faster thinner.
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.
1. Wrong shape pad.1. Use more tapered pad shape.
2. Surface rough-ened.2. Replace pad.
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.
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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