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Control in printing process

The importance of color control bar

Colour control strip is a quality verification tool, it can help the different departments on the finished color printing process of cognition, so that when the quality issue, know how to solve. It is also an objective reference, can understand the color between different devices in the production process, but also can be used as a monitoring and stable production quality.

For example, a foreign customers withElectronicsFile to attach a digital proofing, and you can see the image with a blue, it isDesignThoughts, or where the problems are, if the color control bar, you can know its meaning.

In fact, every buyer wants its suppliers have a stable level of product. While the color control bar is exactly what the pointer printing products quality control. If it can be every colour control strip data into charts, it can also enhance the ability to foresee the problems.

Field density (Solidinkdensity-SID)

Field density is the most important data, as a basic physical quantity measuring the tone value, is also the first color calibration. Field indicates the ink can make the highest color saturation; is actually made of ink film thickness in the steady state. The relationship between ink thickness and reflection density is more complex, ink film Bo Shicheng proportional, but when the ink film thickness reaches saturation, this relationship is not established, that is to say, the density is not unlimited increase.

At the same time, the spot color density shows the color gamut color gamut boundary, large prints more saturated colors, so there are more attracted to dark part details. In printing by adjusting ink keys (Inkkey) to control the ink thickness to adjust the color change.

Print contrast (Printcontrast-PC)

Print contrast is to compare each color ink field and its 75% outlets (there are 70% dot) of reflective capacity, if this reflective capacity gap, namely, the naked eye can spot and 75% net difference easy to distinguish, dark details will act carefully, and light gap less bad, dark part details. Note, there is no need for us to compare 25%, contrast the value 50%. Because dot offset printing in the value added during the whole tone (tonecurve), but will only make the shadow detail disappear due to network into full version. High print contrast quality printing had higher means, the principle is high print contrast will cooperate with field density saturated, so that the dark printing products have better level, image is out of paper feeling, the so-called three-dimensional sense of strong.

From the contrast value, can basically grasp:

The 1 ink inking.

2 dark image of value-added networks

The 3 ink increased concentration (InkDensity) of this effect

Tone changes (Tonevalueincrease-TVl)

Dot (Dotgain-DG)

In the printing process of color variation has three parts:

1 - (Pre-press): change of prepress technology generation outlets, such as the use of film and print, dot will become bigger or fine, or compensation curve film output machine to network changes.

2 Mechanical dot gain (Mechanical dotgain): refers to the printing process printed on the paper that all the mechanical effect of the dot dot zinc plate is greater than the value added.

The 3 optical value-added networks (Optical dotgain): the light on the paper produced on the surface of optical scattering caused by, resulting in the same printing paper with different sizes in different looks.

The United States is usually obtained by the 50% flat screen printing of value-added, as parameters, such as the Indian point of 72%, said the factory outlets increased to 22%. While Europe is more points of value-added networks 40% and 80% is based on the physical properties of printing caused, although it is not possible to become zero value of perfect, but can be used to monitor color control bar to maintain value-added stable, in order to make a draft to compensation in color, problems arise because of increased value of offset. Because the color changes are not necessarily outlets, so in recent years also useful hue value (Tone value increase) this term.

The fault caused by printing dot

Smear (Slurring): refers to the paper and adhesive contact, there is a slight movement, drag caused by ink, dot deformation appears in the same direction.

Ghosting (Doubling): refers to contact adhesive tape and paper, because the ink viscosity, so when the separation paper and tape, printing ink and adhesive plaster is pulled back, the excess ink is printed onto a piece of paper, form a dot irregular increases.

Overprint rate (Inktrapping)

Overprint rate is said ink film has printed on paper are stacked, factors influencing overprint including ink thickness, ink viscosity,PrintingColor, two-color overprint separated by time.

(Gold Printing Group)
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