What are the applications of colorimeters in the printing industry
Core pain points in the printing industry: batch color difference, overprint color deviation, paper base color interference, customer color samples not meeting standards, high rework losses; The colorimeter achieves standardized color control by quantifying Lab color values and Δ E color difference values, covering the entire process of incoming materials, sampling, machine printing, post laminati
Core pain points in the printing industry: batch color difference, overprint color deviation, paper base color interference, customer color samples not meeting standards, high rework losses; The colorimeter achieves standardized color control by quantifying Lab color values and Δ E color difference values, covering the entire process of incoming materials, sampling, machine printing, post lamination processing, finished product quality inspection, and warehouse re inspection.
1、 Pre press material inspection (source color control)
1. Bottom color detection for paper, copperplate paper, matte paper, and kraft paper
There are differences in the whiteness and yellowness of different batches of raw paper, and there may be background color deviation when printed with the same ink; Use a colorimeter to measure the L value (brightness) and b value (yellow blue) of the paper, filter and unify the base color paper to avoid color difference in the finished product caused by the base color.
2. Ink factory acceptance (four-color CMYK, spot color ink)
For each batch of red/yellow/blue/black, gold ink, silver ink, and Pantone spot ink, measure Δ E against the standard ink color sample; If the color difference exceeds the standard, it should be returned directly to the ink factory to prevent large-scale color deviation after being installed on the machine.
3. Calibration of aluminum foil, hot stamping film, and UV varnish base color
The supporting materials for hot stamping and UV technology come with their own base color, which can be quantified in advance to avoid overall color deviation after lamination.
2、 Sampling process: Benchmarking customer standard colors and confirming production basis
1. Customer color card/physical sample color measurement archive
The customer provides packaging boxes, brochures, and actual LOGO samples, and the colorimeter reads Lab values to establish a standard color database, replacing subjective judgment with the naked eye and eliminating disputes over "different colors".
2. Color calibration for digital proofing and traditional film proofing
Adjust the ink ratio and dot density, repeatedly sample and measure Δ E, and control the color difference within the customer's required range (Δ E ≤ 1.5 for color boxes and ≤ 2.5 for regular picture books); After passing the inspection, it will be used as the standard draft for machine production.
3. Spot color matching assistance
Pantone special colors and brand customized colors (fixed colors for enterprise logos) adjust ink blending ratios through color difference data, reduce manual repeated ink testing, and save ink and sampling consumables.
3、 Online inspection of machine printing process (core high-frequency application)
1. First piece confirmation upon startup
After the printing plate is printed on the machine, immediately use a colorimeter to calibrate the standard sample for the first finished product; Adjust the ink balance, printing pressure, and ink thickness to meet the standards before mass production.
2. Regular sampling during production to control batch color difference
The high-speed printing machine continues to feed paper, and the ink concentration and ink balance of the ink roller will slowly change. Samples are taken every few hundred sheets for color measurement; When Δ E continues to increase, adjust the ink in a timely manner to avoid a large number of defective products.
3. Four color overlay color monitoring
The composite colors (green, purple, coffee) after CMYK overlay printing are difficult to distinguish with the naked eye due to subtle deviations. The colorimeter accurately captures the color deviation caused by overlay printing and monitors the color fluctuations caused by dot restoration.
4. Monitor color deviation during drying (a pain point unique to the printing industry)
When the ink is first printed, it is moist and may slightly discolor after drying; Measure the color values of wet ink and dry ink separately, reserve compensation for drying and fading, and ensure that the color of the finished product meets the standard after drying.
4、 Color verification for post-processing (lamination/hot stamping/die-cutting process)
1. Color difference detection before and after laminating
Bright film and matte film will change the visual color of the finished product, and the degree of color change varies with the thickness of the film layer; Retest the color difference after film covering, and adjust the printing background color in advance to offset the color deviation caused by film covering.
2. Hot stamping, silver stamping, concave convex, UV coating testing
Measure the color of the hot pressed aluminum area and local UV patterns separately, and check for color deviation caused by insufficient hot stamping or bottom leakage.
3. Paper mounting and composite process color control
The color box surface paper is attached to the corrugated/gray board, and it changes color slightly under pressure and moisture. The batch of finished products are uniformly rechecked to ensure that the color of the entire batch of packaging boxes is consistent.
5、 Finished product final inspection and quality control filing
1. Sampling and testing of the entire batch of finished products
Before packaging picture books, gift boxes, labels, and handbags, samples should be taken to verify the color difference value with the standard. Unqualified batches should be reworked and reprinted.
2. Unified color control for orders from different batches
Customers place orders for replenishment in multiple batches, retaining standard Lab values for direct benchmarking in subsequent production to ensure no visible color difference between the previous and subsequent batches.
3. Quality data retention, customer complaint evidence
The measurement data is automatically saved. In case of customer color difference complaints, an objective color value report is provided to distinguish whether the visual color difference is caused by printing errors or differences in customer light sources and paper.
6、 Specialized applications for segmented printing categories
1. Color box packaging printing (food, cosmetics, electronic product gift boxes)
Brands have strict requirements for logos and product color blocks, with extremely strict Δ E control. Color difference meters are essential testing tools for factory production;
2. Books, brochures, posters, and promotional flyers
Large batch thin paper printing, with large fluctuations in ink and wash, and regular inspections to stabilize the color of the entire batch;
3. Adhesive labels and anti-counterfeiting printing
Small area spot colors and gradient color blocks are difficult to distinguish with the naked eye, and the instrument accurately quantifies them;
4. Tobacco and alcohol gift boxes, hot stamping special printing
Multi process composite, laminating+hot stamping+UV multi-layer stacking, multi process segmented color measurement;
5. Color printing for flexible packaging (plastic film, food composite bags)
The transparent base color of the film causes significant interference, and it is paired with a colorimeter's dedicated transmission/reflection measurement mode to control ink color.
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