CN104062013B - A kind of color projectional technique of smooth base for post laser paper leaflet - Google Patents
A kind of color projectional technique of smooth base for post laser paper leaflet Download PDFInfo
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Abstract
The present invention relates to the color projectional technique of a kind of smooth base for post laser paper leaflet.First light base for post laser paper is detected, scans, it is determined that its column position and rainbow band cycle；Use printability instrument that laser paper is drawn a design, change proofing condition, it is determined that best ink film thickness and best squeegee pressure；Adopt the spectral information of light base for post laser paper leaflet and chrominance information that integrating sphere spectrophotometer measurement printability instrument draws a design, it is determined that the best on light base for post laser paper leaflet is drawn a design region；Change ink injection amount respectively art post paperboard and laser paper to be drawn a design, adopt the colouring information measuring two class paper printing matters respectively；Analyze the spectroscopic data of art post paperboard sample and laser paper sample, obtain laser paper leaflet and the spectrum simulation expression formula of art post paperboard leaflet color.The present invention solves in actual production, the color of light base for post laser paper leaflet to be difficult to the difficult problem that quantification controls to a certain extent, have convenient and simple for operation fast, the feature that error is little.
Description
Technical field
The present invention relates to the color projectional technique of a kind of smooth base for post laser paper leaflet, draw a design by using printability instrument that common white paperboard and light base for post laser paper are carried out printing, measure spectral information and the chrominance information of two kinds of samples of drawing a design, its color characteristics is analyzed and carries out spectrum simulation, thus proposing a kind of method that colouring information utilizing common white paperboard leaflet calculates and characterizes light base for post laser paper leaflet colouring information.
Background technology
Laser paper leaflet, with multicoloured rainbow effect and to the strong visual impact of human eye, brings new benefit to packages printing industry, but its special colouring effect brings certain puzzlement also to the quality testing of enterprise's leaflet.The color appearance that laser paper leaflet is observed in different viewing angles has very big difference, spectrum and chrominance information that color measurement instrument obtains in diverse location measurement also cannot for the colors of diverse location on accurate characterization laser paper, almost without printing packaging enterprise, laser paper leaflet directly carrying out colour measurement at present, the characterization of laser paper leaflet is also to rely on visual valuation mostly.
Summary of the invention
It is an object of the invention to solve Problems existing in existing smooth base for post laser paper leaflet characterization process, a kind of method that colouring information utilizing common white paperboard leaflet calculates laser paper leaflet colouring information is proposed, thus the characterization for laser paper leaflet provides method, this is also for the quality monitoring offer method of laser paper printing.The method is applicable to the characterization that all outward appearances present the laser paper leaflet of rainbow light beam effect.
For achieving the above object, the present invention takes techniques below scheme:
The color projectional technique of a kind of smooth base for post laser paper leaflet, comprises the steps:
(1) light base for post laser paper is detected, scans, it is determined that its column position and rainbow band cycle；
(2) use printability instrument that laser paper is drawn a design, change proofing condition, it is determined that best ink injection amount (ink film thickness) and best squeegee pressure；
(3) spectral information of light base for post laser paper leaflet and chrominance information that integrating sphere spectrophotometer measurement printability instrument draws a design are adopted, utilize the colouring information measured that the color homogeneity of laser paper leaflet is evaluated, it is determined that the best on light base for post laser paper leaflet is drawn a design region；
(4) under best squeegee pressure, change ink injection amount (ink film thickness) respectively art post paperboard and laser paper to be drawn a design, adopt the mode of step (3) to measure two class paper printing matters spectral information of same position in the best draws a design region respectively；
(5) analyze the spectroscopic data of art post paperboard sample and laser paper sample same position, obtain laser paper leaflet and the spectrum simulation expression formula of art post paperboard leaflet color.
In step (1), adopt flat bed scanner that light base for post laser paper is scanned, to the distance measurement between adjacent two black pillars of scanning gained, it is determined that the rainbow band cycle.
In step (2), first when squeegee pressure constant (empirical value), change ink injection amount (ink film thickness) laser paper is drawn a design, then with integrating sphere spectrophotometer, batten is carried out density measure, it is determined that its best ink injection amount；Then when ink injection amount is constant, change its squeegee pressure and draw a design, it is determined that best squeegee pressure.
In step (3), the employing Spectrophotometric condition of integrating sphere is: D65 light source, CIE1964 standard observer, comprises direct reflection (SCI), to keep the unthreaded hole measuring instrument constant with the angle on laser paper surface during measurement.
According to the measurement data of light base for post laser paper it can be seen that light base for post laser paper is along the direction of light beam or be perpendicular to the chrominance information aberration of light beam direction spaced at integer period position all within 1.0, the aberration of any two sample point is all within 4.0.Therefore, according to measurement result, if the laser paper leaflet after drawing a design is similarly less than 1 along light beam direction aberration, then assert this laser paper leaflet color even, namely select along the light beam direction aberration region less than 1 to be that the best on light base for post laser paper leaflet is drawn a design region.The foundation of this experimental mathematics model is mainly based upon the colouring information along light beam direction.
In step (4), the ink drawn a design can select Huang, product or cyan ink, described ink to be UV ink；Ink injection amount is 0.1ml, 0.2ml, 0.3ml, 0.4ml, 0.5ml respectively.
Draw a design in region in the best, select three points along light beam direction, measure the spectral reflectivity of three points and average, as the spectral information of this sample.
In step (5), with the spectral reflectivity of art post paperboard leaflet for x value, the spectral reflectivity of the laser paper leaflet under same ink amount is y value；Draw scatterplot when λ is taken 400～500nm and 510～700nm respectively, and the scatterplot of two wave bands is made shape such as y=ax22 matched curves of+bx+c, obtain spectrum simulation expression formula.The spectroscopic data of light base for post laser paper leaflet and the spectroscopic data of art post paperboard leaflet are quadratic polynomial relation in visible-range.
It is possible to further the ink injection amount (ink film thickness) changing leaflet carries out drawing a design, measuring, utilize its colouring information that the spectrum simulation expression formula set up is verified；Or by changing the kind of art post paperboard or laser paper, draw a design under best ink injection amount (ink film thickness), measure, utilize the spectrum simulation expression formula that the checking of its colouring information is set up.Owing to for packages printing, using color lump on the spot more, the ink film thickness therefore selected during checking mathematical model is best ink film thickness.
The spectroscopic data using art post paperboard leaflet uses spectrum simulation expression formula to obtain the value of calculation of laser paper leaflet spectroscopic data, compares from the spectra measurement of different ink film thickness laser paper leaflets, obtains spectrum mean square deviation and CIEL*a*b*Aberration.
Take the spectral reflectivity measured value ρ (λ of art post paperboard leaflet1) as x, substitute in above-mentioned fitting expression, the y tried to achieve is the spectral reflectivity value of calculation ρ of ink laser paper under same ink injection amount1(λ2), then it is utilized respectively value of calculation ρ1(λ2) with the measured value ρ (λ of the spectral reflectivity of ink laser paper2) calculate CIEL*a*b*Aberration, obtains the aberration between the value of calculation of each ink injection amount and measured value all within 4.0.
Adopt other kinds of art post paperboard to verify the suitability of above-mentioned mathematical model: art post paperboard is quantitatively at 200g/m2Above white ground paper, the quantitative and whiteness between different types of art post paperboard is different.
1) yellow, product or blue or green ink is adopted to draw a design in another kind of art post paperboard with best ink injection amount；
2) measure the spectral reflectivity of ink art post paperboard, be designated as ρ2(λ1), by ρ2(λ1) substitute in described spectrum simulation expression formula, the y tried to achieve is under the same ink injection amount calculating gained the spectral reflectivity ρ of ink laser paper2(λ2), then utilize the calculated ρ of original art post paperboard1(λ2) and ρ2(λ2) calculate CIEL*a*b*Aberration, obtains the aberration between two value of calculation all within 4.0；Then measured value ρ (λ is utilized2) and value of calculation ρ2(λ2) calculate CIEL*a*b*Aberration, obtains the aberration between two values all within 4.0.
Other types light base for post laser paper is adopted to verify the suitability of above-mentioned mathematical model:
1) yellow, product or blue or green ink is adopted to draw a design on another cycle identical light base for post laser paper with best ink injection amount；
2) measure its spectral reflectivity, be designated as ρ2'(λ2)；By measured value ρ2'(λ2) with the spectral reflectivity measured value ρ (λ of art post paperboard leaflet under same ink injection amount1) substitute into the value of calculation ρ tried to achieve in described spectrum simulation expression formula1(λ2) calculate CIEL*a*b*Aberration, the aberration obtained is all within 5.0.
The conclusion of this invention extends to the yellow ink and green grass or young crops ink that ink injection amount is 0.1～0.5ml, and ink injection amount is the magenta ink of 0.2～0.5ml.
By the present invention in that with printability instrument, common white paperboard and light base for post laser paper being carried out printing draws a design, measure spectral information and the chrominance information of two kinds of samples of drawing a design, its color characteristics is analyzed and carries out spectrum simulation, thus proposing a kind of method that colouring information utilizing common white paperboard leaflet calculates light base for post laser paper leaflet colouring information, this to some extent solves and light base for post laser paper leaflet color is difficult in actual production the difficult problem that quantification controls, there is easy to operate, saving cost, the feature that error is little.
Below by the drawings and specific embodiments, the present invention will be further described, but is not meant to limiting the scope of the invention.
Accompanying drawing explanation
Fig. 1 is the determination figure (Huang Mo) of best ink film thickness.
Fig. 2 is the determination figure (Huang Mo) of best squeegee pressure.
Fig. 3 is the stability region test figure that draws a design.
Fig. 4 is print yellow ink art post paperboard and prints the yellow ink laser paper fitting of a polynomial effect at 400～500nm band spectrum reflectance.
Fig. 5 is print yellow ink art post paperboard and prints the yellow ink laser paper fitting of a polynomial effect at 510～700nm band spectrum reflectance.
Fig. 6 is under best ink injection amount 0.4ml, prints the measured value of yellow ink laser paper spectral reflectivity and the comparison diagram of value of calculation.
Detailed description of the invention
The present invention first has to light base for post laser paper is detected.Select flat bed scanner that light base for post laser paper is scanned, in Photoshop software, use ruler tool to the distance measurement between adjacent two black pillars of scanning gained, it is determined that the rainbow band cycle.The cycle recording experimental optical base for post laser paper by the mode of scanning is 5cm.
Then light base for post laser paper paper itself is carried out colorimetric detection, select integrating sphere type spectrophotometer, measuring condition is D65 light source, illumination is d/8 with observation geometrical condition, CIE1964 standard observer, SCI (comprises direct reflection), ensures that spectrophotometer is constant with the plane included angle of laser paper during measurement.Result shows that the chrominance information aberration of several period positions of interval, direction being whether also perpendicular to iridescence post along light beam direction is all within 1.0, the aberration of any two sample point can control within 4.0, in order to facilitate the foundation of mathematical model, this experiment is mainly based upon the colouring information along light beam direction.
Second step, will determine Huang, product, the best ink film thickness of blue or green three color inks and best squeegee pressure.First when squeegee pressure constant (empirical value), change ink injection amount (ink film thickness) laser paper is drawn a design, then with integrating sphere spectrophotometer, batten is carried out density measure, determine its best ink injection amount, then when ink injection amount is constant, change its squeegee pressure to draw a design, it is determined that best squeegee pressure.
Table 1 is IGTC1-5 printability instrument ink injection amount and ink film thickness synopsis.
Table 1 injection ink device ink injection amount table corresponding to ink film thickness
| Ink injection amount (ml) | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 |
| Ink film thickness (μm) | 0.5 | 0.75 | 1.0 | 1.25 | 1.5 |
For Huang Mo, when squeegee pressure is constant, change ink injection amount, draw field density and see that Fig. 1, Fig. 1 obtain when squeegee pressure is 500N with ink film thickness change curve.According to Fig. 1 and Biao 1 it can be seen that the best ink film thickness 1.25 μm of yellow ink, being best ink injection amount 0.4ml, under best ink film thickness, field density is maximum；When constant ink injection amount is 0.4ml, by changing squeegee pressure, ink film thickness also can change, draw ratio of printing ink transfer and see Fig. 2 with squeegee pressure change curve, the best squeegee pressure 600N of curve peak correspondence Huang ink, under best squeegee pressure, ratio of printing ink transfer is maximum.In like manner, obtain the magenta ink best ink injection amount black with green grass or young crops and be 0.4ml, best squeegee pressure respectively 500N, 550N.
3rd step, region that the best is drawn a design is measured.According to the measurement data of light base for post laser paper it can be seen that light base for post laser paper is along the direction of light beam or be perpendicular to the chrominance information aberration of light beam direction spaced at integer period position all within 1.0, the aberration of any two sample point is within 4.0.In the ideal situation, qualified light base for post laser paper prints the uniform ink film thickness of last layer, so for light base for post laser paper leaflet, the aberration of the sample point being whether also perpendicular to several period positions of interval, iridescence post direction along light beam direction should also within 1.0.In combined pressure process, there is error yet with the printability instrument used of drawing a design, do not ensure that the uniformity of whole batten layer of ink, therefore to the accuracy of follow-up colour measurement, it is necessary to printing product carries out the best and draws a design the mensuration in region.
Light base for post laser paper is cut into 5cm width (paper size is determined according to the size of printability instrument forme), every specimen page all comprises one and scans black pillar (the black pillar obtained after scanning with flat bed scanner), and black pillar is fixing relative to the position of laser paper.X-direction is for being perpendicular to light beam direction；Y-direction is along light beam direction, the spectral information of the light base for post laser paper leaflet that employing integrating sphere spectrophotometer measurement printability instrument is drawn a design and chrominance information, utilize the colouring information measured that the color homogeneity of laser paper leaflet is evaluated, by comparing along the Colorimetry in light beam direction and vertical gap periods position, light beam direction, obtain C1-C2 region (for be each passed through two somes C1, C2 along light beam, and it is perpendicular to the region between two straight lines in light beam direction) for stability region of drawing a design, see Fig. 3.
According to measurement result, if the laser paper printing sample after drawing a design is similarly less than 1 along light beam direction aberration, then assert this laser paper printing sample color even, namely the selected region along light beam direction aberration less than 1 is that the best on light base for post laser paper printing sample is drawn a design region.The foundation of this experimental mathematics model is mainly based upon the colouring information along light beam direction.
Due to the special rainbow effect that light base for post laser paper surface presents, make after laser paper surface prints the uniform ink film thickness of last layer, the colouring information at each position of leaflet is also non-uniform, is mostly also to rely on visual valuation in consideration of it, at present the quality of colour of laser paper leaflet is detected.But the color measurement technique of ink art post paperboard is quite ripe at present, if therefore setting up a mathematical relationship between the colouring information of ink art post paperboard and ink laser paper, so can calculate the colouring information on ink laser paper by the colouring information in ink art post paperboard, accomplish that the quantification to laser paper leaflet color controls.
The ink drawn a design can select Huang, product or cyan UV ink, and ink injection amount is 0.1ml, 0.2ml, 0.3ml, 0.4ml, 0.5ml respectively.For Huang Mo, between the spectral reflectivity of ink art post paperboard and ink light base for post laser paper, the foundation of mathematical model, specifically comprises the following steps that
(1) change ink injection amount (ink film thickness) respectively art post paperboard and laser paper to be drawn a design, adopt the colouring information measuring two class paper printing matters respectively.
Requirement of drawing a design according to printability instrument, by No. 1 light base for post laser paper (cycle of light base for post laser paper is 5cm), No. 1 art post paperboard (the quantification of 250g/m of art post paperboard2, whiteness is 81.7%) and cut into the batten of 290 × 50mm, totally 10 (each 5).Every laser paper all comprises one and scans black pillar, and black pillar is fixing relative to the position of laser paper.Under best squeegee pressure, using IGTC1-5 printability instrument that No. 1 laser paper, No. 1 art post paperboard are drawn a design, ink injection amount is 0.1ml, 0.2ml, 0.3ml, 0.4ml, 0.5ml respectively, respectively obtains 5 leaflets.
(2) use integrating sphere type spectrophotometer SP64 that 10 leaflets are carried out color measuring, metering system is measure the best on black pillar draw a design in region along C1, C, C2 tri-spectral reflectivity of point (C is any position between C1 and C2) in same light beam direction scanning of ink laser paper, average again, obtain laser paper under different ink injection amount and draw a design the spectral reflectivity measured value of sample in Table 1.Ink art post paperboard is measured C1, C, C2 tri-spectral reflectivity of point (identical with position on laser paper), then averages, obtain art post paperboard under different ink injection amount and draw a design the spectral reflectivity measured value of sample in Table 2；Measuring condition is D65 light source, and illumination is d/8 with observation geometrical condition, and spectral region 400-700nm, wavelength interval is 10nm, CIE1964 standard observer, and LAV (diameter is the circle of 2.54cm), SCI (comprises direct reflection).
Under the different ink injection amount of table 1, laser paper is drawn a design the spectral information of sample
Under the different ink injection amount of table 2, art post paperboard is drawn a design the spectral information of sample
(3) under same ink injection amount, the spectral reflectivity taking print No. 1 art post paperboard of yellow ink is ρ (λ1), the spectral reflectivity taking print No. 1 laser paper of yellow ink is ρ (λ2), with ρ (λ1) for abscissa, ρ (λ2) for vertical coordinate, draw scatterplot as shown in Figure 4,5 when λ value is 400～500nm and 510～700nm respectively, and make shape such as y=ax22 matched curves of+bx+c.As 400nm≤λ≤500nm, the fit equation obtaining Huang Mo is y=-0.0194x2+ 2.2139x-4.7667, R2=0.9610；As 510nm≤λ≤700nm, the fit equation obtaining Huang Mo is y=-0.0095x2+ 1.9268x-15.493, R2=0.9203.R2Representing correlation coefficient, numerical value is closer to 1, and the accuracy of formula is more high.
(4) the spectral reflectivity ρ (λ of print No. 1 art post paperboard of yellow ink is taken1) as x, substitute in the fitting expression of above-mentioned yellow ink, the spectral reflectivity ρ that the y tried to achieve is under the same ink injection amount calculating gained print yellow ink laser paper1(λ2), then it is utilized respectively value of calculation ρ1(λ2) and measured value ρ (λ2) calculate CIEL*a*b*Aberration, obtains the aberration between the value of calculation of each ink injection amount and measured value all within 4.0, in Table 3.
Print Huang ink laser paper color measured values under the different ink injection amount of table 3 compares with value of calculation aberration
Adopt No. 2 art post paperboard (the quantification of 300g/m of art post paperboard2, whiteness is 78.5%), (cycle of 1-3 laser paper is identical, and the width scanning black pillar is roughly the same, it is impossible to measure accurately, and three kinds of laser paper microstructures are different for No. 2 and No. 3 laser papers.During color measuring, spectrophotometric unthreaded hole center is directed at the centre position of black pillar, and spectrophotometric smooth bore dia is far longer than the width of black pillar) verify and specifically comprise the following steps that the suitability of above-mentioned mathematical model
(1) No. 2 art post paperboards are cut into the batten of 290 × 50mm, under best squeegee pressure, takes best ink injection amount 0.4ml with yellow ink and draw a design.
(2) using integrating sphere type spectrophotometer SP64 that No. 2 leaflets are carried out color measuring, metering system is the spectral reflectivity measuring C1, C, C2 3 in print No. 2 art post paperboards of yellow ink, then averages, and is designated as ρ2(λ1).By ρ2(λ1) substitute in above-mentioned yellow ink fitting expression, the spectral reflectivity ρ that the y of gained is under the same ink injection amount calculating gained print yellow ink laser paper2(λ2), then it is utilized respectively the print No. 1 calculated ρ of art post paperboard of yellow ink1(λ2) and ρ2(λ2) calculate CIEL*a*b*Aberration, obtains the aberration between two value of calculation all within 4.0, in Table 4.Table 4 is for being under 0.4ml at ink injection amount, and the aberration of the ink laser paper that two kinds of ink art post paperboards calculate gained respectively compares, and Huang Mo is relatively small, is 0.34, and magenta ink aberration is 3.71, and blue or green ink is 2.97.
Utilize the measured value ρ (λ of print No. 1 laser paper of yellow ink2) and value of calculation ρ2(λ2) calculate CIEL*a*b*Aberration, obtains the aberration between two values all within 4.0, in Table 5 and Fig. 6.Table 5 is for being under 0.4ml at ink injection amount, and the aberration of the measured value of No. 1 ink laser paper and No. 2 ink art post paperboard value of calculation compares.Value of calculation in Fig. 6 is the value of calculation of No. 1 art post paperboard, and the value of calculation of the value of calculation of No. 2 art post paperboards and No. 1 art post paperboard almost overlaps, not shown in the diagram.Compare conclusion still set up it can be seen that do aberration with the measured value of No. 1 ink laser paper and the value of calculation of No. 2 ink art post paperboards.
The different art post paperboard value of calculation colourity of table 4 compares
The measured value of No. 51 ink laser papers of table and the aberration of No. 2 ink art post paperboard value of calculation compare
Note: the aberration of magenta ink is 1.23；The aberration of blue or green ink is 3.25.
(3) 2, No. 3 laser papers cut into the batten of 290 × 50mm, and every laser paper all comprises one and scans black pillar, and black pillar is fixing relative to the position of laser paper.Under best squeegee pressure, using IGTC1-5 printability instrument to draw a design, ink injection amount is 0.4ml.
(4) using integrating sphere type spectrophotometer SP64 that two leaflets are carried out color measuring, metering system is the spectral reflectivity measuring C1, C, C2 3 in print yellow ink art post paperboard, then averages, and is designated as ρ respectively2'(λ2)、ρ3'(λ2).By two measured value ρ2'(λ2)、ρ3'(λ2) respectively with value of calculation ρ1(λ2) calculate CIEL*a*b*Aberration, the aberration obtained is all within 5.0, in Table 6.The aberration that table 6 is between measured value and the value of calculation of lower No. 2, No. 3 laser paper leaflets of 0.4ml ink injection amount compares.
Aberration between measured value and the value of calculation of No. 62, No. 3 laser paper leaflets of table compares
For magenta ink, blue or green ink, the method of the equally possible employing present invention sets up the Mathematical Fitting relation between ink art post paperboard and ink laser paper spectral reflectivity, therefore the method for the present invention is possible not only to the colouring information on the light base for post laser paper for estimating the yellow ink of print, and can be used to the colouring information on the light base for post laser paper of estimation print magenta ink, blue or green ink.Simultaneously, select different types of art post paperboard, above-mentioned mathematical model is all applicable, conclusion extends to the yellow ink and green grass or young crops ink that ink injection amount is 0.1～0.5ml, ink injection amount is that the magenta ink of 0.2～0.5ml is (when magenta ink ink injection amount is 0.1ml, aberration between the value of calculation and the measured value that obtain according to spectrum simulation curve is 6.4, and numerical value is bigger than normal).Under best ink injection amount, above-mentioned mathematical model can also be used to the spectral reflectivity on estimation variety classes ink light base for post laser paper.
The present invention estimates the colouring information of ink light base for post laser paper by measuring the spectral reflectivity of ink art post paperboard.First pass through scanning and determine the light beam cycle of light beam rainbow laser paper；Printability instrument is adopted to use UV ink that light base for post laser paper is drawn a design, it is determined that best ink injection amount, best squeegee pressure and stability region of drawing a design；Under best squeegee pressure, adopt Huang, product, blue or green trichroism UV ink that light base for post laser paper and art post paperboard are drawn a design；The mode comprising specular light is adopted to measure the spectral reflectivity of ink light base for post laser paper and ink art post paperboard with integrating sphere type diffuse-reflectance light source；By wavelength 400～500nm, 510～700nm, the scatterplot that ink art post paperboard spectral reflectivity and ink laser paper spectral reflectivity draw gained is carried out piecewise fitting, meet quadratic equation with one unknown relation；By different types of art post paperboard, light base for post laser paper, the mathematical model set up is verified.The invention solves the color of light base for post laser paper leaflet is difficult to by actual production quantification control a difficult problem, have convenient and simple for operation fast, the feature that error is little.
Claims (8)
1. a color projectional technique for light base for post laser paper leaflet, comprises the steps:
(1) light base for post laser paper is detected, scans, it is determined that its column position and rainbow band cycle；
(2) use printability instrument that light base for post laser paper is drawn a design, change proofing condition, it is determined that best ink injection amount and best squeegee pressure；
(3) spectral information of light base for post laser paper leaflet and chrominance information that integrating sphere spectrophotometer measurement printability instrument draws a design are adopted, utilize the colouring information measured that the color homogeneity of light base for post laser paper leaflet is evaluated, determine that the best on light base for post laser paper leaflet is drawn a design region, region of the best being defined as on light base for post laser paper leaflet along the light beam direction aberration region less than 1 being drawn a design；
(4) under best squeegee pressure, change ink injection amount and respectively art post paperboard and light base for post laser paper are drawn a design, adopt the mode of step (3) to measure two class paper printing matters spectral information of same position in the best draws a design region respectively；
(5) analyzing the spectroscopic data of art post paperboard leaflet and light base for post laser paper leaflet same position, with the spectral reflectivity of art post paperboard leaflet for x value, the spectral reflectivity of the light base for post laser paper leaflet under same ink amount is y value；Draw scatterplot respectively when the wavelength X of measure spectrum is taken 400～500nm and 510～700nm, and the scatterplot of two wave bands is made shape such as y=ax22 matched curves of+bx+c, a, b and c be constant respectively, obtains the spectrum simulation expression formula of light base for post laser paper leaflet and art post paperboard leaflet color.
2. the color projectional technique of smooth base for post laser paper leaflet according to claim 1, it is characterized in that: in described step (1), adopt flat bed scanner that light base for post laser paper is scanned, to the distance measurement between adjacent two black pillars of scanning gained, it is determined that the rainbow band cycle.
3. the color projectional technique of smooth base for post laser paper leaflet according to claim 1, it is characterized in that: in described step (3), the employing Spectrophotometric condition of integrating sphere is: D65 light source, CIE1964 standard observer, comprising direct reflection, the unthreaded hole measuring instrument during measurement is constant with the angle on light base for post laser paper surface.
4. the color projectional technique of smooth base for post laser paper leaflet according to claim 1, it is characterised in that: the ink drawn a design is yellow, product or blue or green ink, ink injection amount respectively 0.1ml, 0.2ml, 0.3ml, 0.4ml and 0.5ml.
5. the color projectional technique of smooth base for post laser paper leaflet according to claim 1, it is characterized in that: in described step (4), draw a design in region in the best, select three points along light beam direction, measure the spectral reflectivity of three points and average, as the spectral information of light base for post laser paper leaflet.
6. the color projectional technique of smooth base for post laser paper leaflet according to claim 1, it is characterised in that: take the spectral reflectivity measured value ρ (λ of art post paperboard leaflet1) as x, substitute in described spectrum simulation expression formula, the spectral reflectivity value of calculation ρ that the y tried to achieve is under same ink injection amount ink light base for post laser paper1(λ2), λ1And λ2For the wavelength of measure spectrum, then it is utilized respectively value of calculation ρ1(λ2) with the measured value ρ (λ of the spectral reflectivity of ink light base for post laser paper2) calculate CIEL*a*b*Aberration, obtains the aberration between the value of calculation of each ink injection amount and measured value all within 4.0.
7. the color projectional technique of smooth base for post laser paper leaflet according to claim 6, it is characterised in that: adopt other art post paperboard leaflet to verify the suitability of mathematical model:
1) yellow, product or blue or green ink is adopted to draw a design in the quantitative art post paperboard different with whiteness of another kind with best ink injection amount；
2) measuring process 1) spectral reflectivity of ink art post paperboard that obtains, it is designated as ρ2(λ1), by ρ2(λ1) substitute in described spectrum simulation expression formula, the y tried to achieve is under the same ink injection amount calculating gained the spectral reflectivity ρ of ink light base for post laser paper2(λ2), utilize the calculated ρ of former art post paperboard1(λ2) and ρ2(λ2) calculate CIEL*a*b*Aberration, obtains the aberration between two value of calculation all within 4.0；Then measured value ρ (λ is utilized2) and value of calculation ρ2(λ2) calculate CIEL*a*b*Aberration, obtains the aberration between two values all within 4.0.
8. the color projectional technique of smooth base for post laser paper leaflet according to claim 6, it is characterised in that: adopt other light base for post laser papers to verify the suitability of mathematical model:
1) adopt yellow, product or blue or green ink so that the best light base for post laser paper that ink injection amount is identical in another cycle, microstructure is different to be drawn a design；
2) measuring process 1) spectral reflectivity of light base for post laser paper, it is designated as ρ2'(λ2)；By measured value ρ2'(λ2) with the spectral reflectivity measured value ρ (λ of art post paperboard leaflet under same ink injection amount1) substitute into the value of calculation ρ tried to achieve in described spectrum simulation expression formula1(λ2) calculate CIEL*a*b*Aberration, the aberration obtained is all within 5.0.
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| DE102016207994B4 (en) * | 2016-05-10 | 2017-11-30 | Heidelberger Druckmaschinen Ag | Method for generating a proof |
| CN108872062A (en) * | 2018-06-28 | 2018-11-23 | 深圳市科彩印务有限公司 | A kind of quick-fried color determination method of package printed matter |
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| CN103196560B (en) * | 2013-04-08 | 2014-11-26 | 北京印刷学院 | Chroma characterization and detection method of grating base columnar rainbow hologram |
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