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Press-side and inline color quality solutions designed for flexographic and packaging environments can slash makeready times, increase color accuracy and consistency—plus, put money back in the printers’ pocket.

Let’s face it, packaging printers have been getting squeezed by consumer package goods companies (CPGCs):

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Techkon SpectroVision inline spectrophotometer installed inside a flexographic press.
All photos courtesy of Techkon USA

In these situations, operators must still rely on their eyes both during makeready to match colors and during the production run to ensure consistency. The danger here is long makeready times, color that does not hit the specification, and inconsistent color throughout the run, which can all lead to customer rejections, job remakes, increased waste and, ultimately, lower profitability for the printer.

So, what can a printer do to reclaim profitability? Well, the answer is no different than how printers have increased their productivity and profitability in other parts of their workflow over the last few decades. Simply put, package printers must adopt newer tools that employ the use of science and technology to remove the color “guesswork” for press operators to ensure a much more predictable, accurate and repeatable print manufacturing process.
Here is a look at the “good,” “better” and “best” technology options that are available today and being deployed in packaging pressrooms:

Now, let’s take a closer look and see just how each of these technology options can increase color accuracy, shorten makeready times and allow packaging printers to reclaim their profitability.

Good: Replacing Densitometers with Spectrophotometers

Quite simply, densitometers do not measure color and are incapable of reporting a color’s CIE Lab values. This also means densitometers cannot objectively describe how a color is perceived by the human visual system or quantify the perceived differences between two shades of colors using a Delta E formula. For this reason, switching from densitometers to spectrophotometers is an absolute must for packaging printers. Otherwise, press operators cannot know when contractual brand specifications have been achieved or what color changes are required to meet them.

[perfectpullquote align=”full” bordertop=”false” cite=”” link=”” color=”#eb89c4″ class=”” size=””]”The trends are clear. Brand owners will continue to place ever increasing demands for color accuracy and color consistency on their print supply chain.”[/perfectpullquote]

Making this shift is relatively easy for press operators because spectrophotometers can still report all of the familiar densitometric functions like solid ink density and TVI, which are important process control metrics, and the instruments are operated and handled in the same way as densitometers. However, in addition to reporting densitometric and colorimetric values for measured samples, spectrophotometers have many more features and functions that can help guide operators to faster and more accurate color matches.

The workflow using a spectrophotometer to check color accuracy is extremely similar to that of using a densitometer. On a flexographic press, the press is stopped and a sample is cut from the roll; while on a sheetfed press, a sample is simply pulled from the output stack. The printed sample is then placed on a flat surface where it can be measured with the spectrophotometer.

Now, the press operator selects the measurement mode on the instrument (density, TVI, CIE Lab opacity, etc.), aligns the measurement aperture over the sample to be measured, initiates the measurement, and the results will be shown on the instrument display. If users wish to see other measurement information from this same sample, they will then need to change the display mode on the instrument.

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