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

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

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

Potential Problems in Printing – Description of Problems and Proposed Solutions

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.

Insufficient opacity of ink while Pad Printing?

Potential Problems in Printing – Description of Problems and Proposed Solutions

This problem very often occurs in pad printing, and cannot always be solved satisfactorily. Due to the low degree of ink transfer in pad printing, 100 % opacity cannot be achieved on many objects with only a single printing, especially in the case of dark substrates. Increased hiding power can be attained by double or triple printing or preprinting with white.

Misregister in multi color prints while Pad Printing?

Potential Problems in Printing – Description of Problems and Proposed Solutions

The simplest way to contain these deficiencies is to produce a new cliche with precisely registered film.

Distortion of motif while Pad Printing?

Potential Problems in Printing – Description of Problems and Proposed Solutions

Distortion means that a printed rectangle, for example, does not show any right-angled corners, and has more the shape of a cushion. Distortion occurs primarily in very curved motifs or in motifs which are in proximity to an edge of the area to be printed or of the substrate. It is often impossible to achieve a 100 % correction. It is possible to make a wraparound print, but improvements with this method are also limited.

Blurring of Print while Pad Printing?

Potential Problems in Printing – Description of Problems and Proposed Solutions

Blurred print is understood as the indistinct, hazy reproduction of lines or letters. This deficiency is often confused with distortion.