CN110744939A - Natural-color kraft paper high-saturation color printing process - Google Patents
Natural-color kraft paper high-saturation color printing process Download PDFInfo
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- CN110744939A CN110744939A CN201911118996.5A CN201911118996A CN110744939A CN 110744939 A CN110744939 A CN 110744939A CN 201911118996 A CN201911118996 A CN 201911118996A CN 110744939 A CN110744939 A CN 110744939A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/26—Printing on other surfaces than ordinary paper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/14—Multicolour printing
- B41M1/18—Printing one ink over another
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Abstract
The invention provides a high-saturation color printing process for unbleached kraft paper, which comprises the following steps of: s01, measuring the chromaticity of brown paper to be printed and recording the chromaticity value; s02, carrying out color adjustment on the image to be printed; s03, extracting the highlight part of the image to be used as a single white special color plate; s04, on the basis of the color value of the image to be printed adjusted in the step S02, subtracting the colorimetric value of the brown paper of the natural color obtained in the step S01 to obtain the image to be printed after color subtraction; s05, carrying out spot color separation on the image to be printed obtained in the step S04; s06, splicing the split color pieces obtained in the step S05 into large plates, and outputting printing plates; and S07, printing on the corresponding color groups of the printing machine by adopting the printing plates and the spot color inks of the various colors and the cyan, the piny, the yellow and the black inks, and transferring the inks of the various colors to brown paper of the natural color to finish printing. The invention has the beneficial effects that: the reproduction effect and the color saturation of the printed image of the natural color cowhide are improved.
Description
Technical Field
The invention relates to a printing process, in particular to a high-saturation color printing process for natural-color kraft paper.
Background
Kraft, used as packaging material, is very strong and is usually tan, semi-bleached or fully bleached kraft pulp is light brown, cream or white. In order to obtain better color reproduction in kraft paper printing, certain difficulty exists, especially, the accurate color reproduction on a common kraft paper board is more difficult than the printing on a bleached kraft paper board, and due to the interference of the color of kraft paper, after each color of printing ink is overprinted on kraft paper, a printed color image is obviously darker and cannot present high-saturation colors, so that the process technology of more suitably performing high-saturation color printing on kraft paper needs to be researched.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a high-saturation color printing process for natural-color kraft paper.
The invention provides a high-saturation color printing process for unbleached kraft paper, which comprises the following steps of:
s01, measuring the chromaticity of brown paper to be printed and recording the chromaticity value;
s02, performing color adjustment on the image to be printed, and improving the color saturation of the image to be printed;
s03, extracting the highlight part of the image obtained after the color saturation is adjusted in the step S02 to be used as a single white spot color;
s04, on the basis of the color value of the image to be printed adjusted in the step S02, subtracting the colorimetric value of the brown paper of the natural color obtained in the step S01 to obtain the image to be printed after color subtraction;
s05, performing spot color separation on the image to be printed obtained in the step S04, extracting one or more spot colors from the image to be printed according to the dominant hue of the image, blending corresponding spot color ink according to the obtained spot color values, and performing cyan, magenta, yellow and black color separation on the image after the spot color extraction;
s06, splicing the split color pieces obtained in the step S05 into large plates, and outputting printing plates;
and S07, printing on corresponding color groups of the printing machine by adopting the printing plates of the various colors output in the step S06 and the spot color ink and the cyan, magenta, yellow and black inks prepared in the step S05, and transferring the ink of the various colors to brown paper of the natural color to finish printing.
As a further improvement of the present invention, in step S01, the chroma of the brown paper to be printed is measured using a spectrophotometer and the chroma value is recorded; in step S02, color adjustment is performed on the image to be printed in the image processing software.
As a further improvement of the present invention, in step S01, the chromaticity of the brown paper to be printed is measured by using a spectrophotometer, and the specific measurement method is as follows:
s011, randomly drawing a plurality of samples from unbleached kraft paper to be printed and numbering the samples in sequence;
s012, measuring 9 groups of colorimetric values on each kraft paper sample according to the Sudoku area on the numbered kraft paper samples by using a spectrophotometer, and correspondingly recording according to the sample numbers;
and S013, eliminating the chromaticity value data with large errors in the step S012, and calculating the arithmetic mean value of the residual data to obtain the chromaticity value of the kraft paper of the batch.
As a further improvement of the present invention, the spot color separation of the image to be printed in step S05 specifically includes the following steps:
s051, carrying out image segmentation on the image to be printed after color reduction in the step S04, and separating the foreground color and the background color of the image to be printed into two independent parts;
s052, extracting a spot color according to the separated main hue of the foreground color image;
s053, extracting a spot color according to the separated dominant hue of the background color image, wherein the extraction method is consistent with the step S052;
s054, combining the foreground color and the background color after the spot color is extracted, and carrying out color separation on the four colors of cyan, magenta, yellow and black.
As a further improvement of the present invention, in step S052, the extraction method is to measure the color value of the center point of each cell according to the squared figure, take the arithmetic mean of the remaining color values after eliminating the color value with the largest error, and multiply the obtained arithmetic mean by the extraction coefficient a.
As a further improvement of the invention, a is more than or equal to 50% and less than or equal to 70%.
As a further improvement of the present invention, the implementation process of printing in step S07 specifically includes the following steps:
s071, printing solid white ink on the surface of unbleached kraft paper to reduce the influence of chroma of the unbleached kraft paper on color reduction of the printing ink;
s072, printing each spot color ink on the basis of the step S071, wherein the spot color ink is printed on the spot to further reduce the influence of the chroma of the unbleached kraft paper on the color reduction of the printed ink;
s073, printing cyan, magenta, yellow and black inks on the basis of the step S072, wherein the printing sequence of the cyan and magenta two-color inks is determined by the cold and warm tones of the image, namely, the cyan ink is printed firstly on the cold tone pattern, then the magenta, yellow and black inks are printed secondly on the cold tone pattern, the cyan ink, the yellow ink and the black ink are printed secondly on the warm tone pattern, and the opaque ink is adopted for the firstly printed ink, so that the influence of the chroma of the brown paper of the natural color on the subsequent color is reduced;
and S074, printing white ink on the basis of the step S073.
As a further improvement of the present invention, the printing in step S07 is performed by a flexographic printing press.
The invention has the beneficial effects that: through special color separation and the matching use of special color ink and common four-color ink, the special color ink is printed firstly, the opacity of the special color ink is utilized to cover the brown paper of the natural color to a certain degree, and the interference of the chroma of the brown paper of the natural color on the color of the green yellow-black four-color ink is reduced, so that the reproduction effect and the color saturation of a printed image are improved, and the process is simple, strong in operability and remarkable in effect.
Detailed Description
The present invention will be further described with reference to the following embodiments.
A high-saturation color printing process for unbleached kraft paper comprises the following steps:
s01, measuring the chromaticity of brown paper to be printed by using a spectrophotometer and recording the chromaticity value;
s02, carrying out color adjustment on the image to be printed in the image processing software, and properly improving the color saturation of the image to be printed;
s03, extracting the highlight part of the image obtained after the color saturation is adjusted in the step S02 to be used as a single white spot color;
s04, on the basis of the color value of the image to be printed adjusted in the step S02, subtracting the colorimetric value of the brown paper of the natural color obtained in the step S01 to obtain the image to be printed after color subtraction;
s05, performing spot color separation on the image to be printed obtained in the step S04, extracting one or more spot colors from the image to be printed according to the dominant hue of the image, blending corresponding spot color ink according to the obtained spot color values, and performing cyan, magenta, yellow and black color separation on the image after the spot color extraction;
s06, splicing the split color pieces obtained in the step S05 into large plates, and outputting printing plates;
and S07, printing on corresponding color groups of the printing machine by adopting the printing plates of the various colors output in the step S06 and the spot color ink and the cyan, magenta, yellow and black inks prepared in the step S05, and transferring the ink of the various colors to brown paper of the natural color to finish printing.
Example one
For a warm-color and dark-color printed image without a white background, the method specifically comprises the following steps when the natural-color kraft paper high-saturation color printing process is adopted:
s01, measuring the chromaticity of brown paper to be printed by using a spectrophotometer and recording the chromaticity value;
s02, carrying out color adjustment on the image to be printed in the image processing software, and properly improving the color saturation of the image to be printed;
s03, extracting the highlight part of the image obtained after the color saturation is adjusted in the step S02 to be used as a single white spot color;
s04, on the basis of the color value of the image to be printed adjusted in the step S02, subtracting the colorimetric value of the brown paper of the natural color obtained in the step S01 to obtain the image to be printed after color subtraction;
s05, carrying out cyan, magenta, yellow and black color separation on the image to be printed obtained in the step S04;
s06, splicing the split color pieces obtained in the step S05 into large plates, and outputting printing plates;
and S07, printing on the corresponding color group of the printing machine by adopting the printing plate and the cyan, piny, yellow and black inks of the colors output in the step S06, and transferring the ink of each color to brown paper of the natural color to finish printing.
In the step S01, measuring the chroma of the brown paper to be printed by using a spectrophotometer, wherein the specific measuring method comprises the following steps:
s011, randomly drawing 20 samples from unbleached kraft paper to be printed and numbering the samples in sequence from 1 to 20;
s012, measuring 9 groups of colorimetric values on each kraft paper sample according to the Sudoku area on the kraft paper samples with the numbers of 1-20 by using a spectrophotometer, and correspondingly recording according to the sample numbers;
and S013, eliminating the chromaticity value data with large errors in the step S012, and calculating the arithmetic mean value of the residual data to obtain the chromaticity value of the kraft paper of the batch.
In this embodiment, the printing press in step S07 is a flexographic printing press, and the thickness of each color ink layer on the kraft paper of the original color is increased by further increasing the amount of each color ink transferred, so as to increase the color saturation of the printed image. And the printing implementation process in the step S07 specifically comprises the following steps:
s071, printing cyan, magenta, yellow and black ink on the surface of unbleached kraft paper, printing the magenta ink first, and then printing the cyan, yellow and black ink, wherein the printed magenta ink adopts opaque ink to reduce the influence of the chroma of the unbleached kraft paper on the subsequent color;
s072, the white ink is printed based on step S071.
Because the image to be printed is a warm-color and dark-color printed image without a white background, the cyan, magenta, yellow and black inks can be directly printed on the natural-color kraft paper without using a white ink pad, the natural-color ink is printed firstly, and the opaque natural-color ink is used, in order to reduce the influence of the natural-color kraft paper on the color, the chromatic value of the natural-color kraft paper is subtracted from the image to be printed in advance in step S04, the chromatic value of the natural-color kraft paper is taken as a spot color in the image to be printed, the printed image after the color reduction is printed on the basis of the chromatic value of the natural-color kraft paper, the printed image can be ensured not to be dark, the saturation of the printed image is improved, finally, the white spot-color ink pattern extracted in step S03 is printed on the cyan, magenta, yellow and black inks, and the influence of the natural-color kraft paper is greatly reduced due to the covering of the front four color inks, particularly the covering of the opaque natural, and then the white ink is printed on the uppermost layer, and the highlight part is displayed, so that the color image printing with high saturation is realized.
Example two
For a cold tone printing image with a white background, when the natural-color kraft paper high-saturation color printing process is adopted, the method specifically comprises the following steps:
s01, measuring the chromaticity of brown paper to be printed by using a spectrophotometer and recording the chromaticity value;
s02, carrying out color adjustment on the image to be printed in the image processing software, and properly improving the color saturation of the image to be printed;
s03, extracting the highlight part of the image obtained after the color saturation is adjusted in the step S02 to be used as a single white spot color;
s04, performing spot color separation on the image to be printed obtained in the step S02, extracting one or more spot colors from the image to be printed according to the dominant hue of the image, blending corresponding spot color ink according to the obtained spot color values, and performing cyan, magenta, yellow and black color separation on the image after the spot color extraction;
s05, splicing the split color pieces obtained in the step S04 into large plates, and outputting printing plates;
and S06, printing on corresponding color groups of the printing machine by adopting the printing plates of the various colors output in the step S05 and the spot color ink and the cyan, magenta, yellow and black inks prepared in the step S05, and transferring the ink of the various colors to brown paper of the natural color to finish printing.
In the step S01, measuring the chroma of the brown paper to be printed by using a spectrophotometer, wherein the specific measuring method comprises the following steps:
s011, randomly drawing 20 samples from unbleached kraft paper to be printed and numbering the samples in sequence from 1 to 20;
s012, measuring 9 groups of colorimetric values on each kraft paper sample according to the Sudoku area on the kraft paper samples with the numbers of 1-20 by using a spectrophotometer, and correspondingly recording according to the sample numbers;
and S013, eliminating the chromaticity value data with large errors in the step S012, and calculating the arithmetic mean value of the residual data to obtain the chromaticity value of the kraft paper of the batch.
The spot color separation of the printed image in step S04 specifically includes the following steps:
s041, carrying out image segmentation on the image to be printed in the step S02, and separating the foreground color and the background color of the image to be printed into two independent parts;
s042, extracting a spot color according to the separated main hue of the foreground color image, in which the extraction method includes measuring the color value of the center point of each cell according to the squared figure, taking the arithmetic average of the remaining color values after eliminating the color value with the largest error, and multiplying the arithmetic average by an extraction coefficient a, where a =60% and the extraction coefficient a may be preferably 50% or 70%;
s043, extracting a spot color according to the separated main hue of the background color image, wherein the extraction method is the same as that in the step S042;
and S044, combining the foreground color and the background color after the spot color is extracted, and carrying out color separation on the four colors of cyan, magenta, yellow and black.
The printing press in step S06 is a flexographic printing press, and the thickness of each color ink layer on the kraft paper of the original color is increased by further increasing the amount of each color ink transferred to increase the color saturation of the printed image. The specific process steps are as follows:
s061, printing solid white ink on the surface of the natural-color kraft paper to weaken the influence of the chromaticity of the natural-color kraft paper on color reduction of the printing ink;
s062, printing all spot color printing inks on the basis of the step S061, wherein the spot color printing inks are printed on the spot, and the influence of the chroma of the brown paper of the natural color on the color reduction of the printing color inks is further weakened due to the non-transparent property of the spot color printing inks;
s063, printing cyan, magenta, yellow and black ink on the basis of the step S062, printing the cyan ink first and then printing the magenta ink, the yellow ink and the black ink, wherein the cyan ink printed first adopts opaque ink so as to reduce the influence of the chroma of the unbleached kraft paper on the subsequent color;
and S064, printing white ink on the basis of the step S063.
Because the image is printed by the cool tone with the white background, a solid white ink layer needs to be padded to cover the color of the brown paper to a certain extent when the image is printed, then, a special ink is printed on the solid white ink layer, the color influence of the natural color kraft paper is further shielded through the opacity of the special ink, then printing cyan, magenta, yellow and black ink on the spot color ink layer, printing the cyan ink firstly, and using opaque magenta ink, in order to reduce the influence of the natural color kraft paper on the color, the white spot color ink pattern extracted in the step S03 is finally printed on the cyan, magenta, yellow and black ink, because the four color inks in the front are covered, especially the opaque ink is covered, the influence of the brown paper of the natural color is greatly reduced, and then the white ink is printed on the uppermost layer to show the highlight part, so that the color image printing with high saturation is realized.
According to the high-saturation color printing process for the unbleached kraft paper, the special color separation and the special color ink are matched with the common four-color ink, the special color ink is printed firstly, the unbleached kraft paper is covered to a certain degree by using the opacity of the special color ink, and the interference of the chroma of the unbleached kraft paper on the color of the green yellow-black four-color ink is reduced, so that the reproduction effect and the color saturation of a printed image are improved, and the process is simple, high in operability and remarkable in effect.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
1. The high-saturation color printing process of unbleached kraft paper is characterized by comprising the following steps of:
s01, measuring the chromaticity of brown paper to be printed and recording the chromaticity value;
s02, performing color adjustment on the image to be printed, and improving the color saturation of the image to be printed;
s03, extracting the highlight part of the image obtained after the color saturation is adjusted in the step S02 to be used as a single white spot color;
s04, on the basis of the color value of the image to be printed adjusted in the step S02, subtracting the colorimetric value of the brown paper of the natural color obtained in the step S01 to obtain the image to be printed after color subtraction;
s05, performing spot color separation on the image to be printed obtained in the step S04, extracting one or more spot colors from the image to be printed according to the dominant hue of the image, blending corresponding spot color ink according to the obtained spot color values, and performing cyan, magenta, yellow and black color separation on the image after the spot color extraction;
s06, splicing the split color pieces obtained in the step S05 into large plates, and outputting printing plates;
and S07, printing on corresponding color groups of the printing machine by adopting the printing plates of the various colors output in the step S06 and the spot color ink and the cyan, magenta, yellow and black inks prepared in the step S05, and transferring the ink of the various colors to brown paper of the natural color to finish printing.
2. The brown paper high saturation color printing process of claim 1, wherein: in step S01, measuring the chroma of brown paper to be printed using a spectrophotometer and recording the chroma value; in step S02, color adjustment is performed on the image to be printed in the image processing software.
3. The brown paper high saturation color printing process of claim 2, wherein: in step S01, measuring the chroma of the brown paper to be printed by using a spectrophotometer, wherein the specific measuring method comprises the following steps:
s011, randomly drawing a plurality of samples from unbleached kraft paper to be printed and numbering the samples in sequence;
s012, measuring 9 groups of colorimetric values on each kraft paper sample according to the Sudoku area on the numbered kraft paper samples by using a spectrophotometer, and correspondingly recording according to the sample numbers;
and S013, eliminating the chromaticity value data with large errors in the step S012, and calculating the arithmetic mean value of the residual data to obtain the chromaticity value of the kraft paper of the batch.
4. The brown paper high saturation color printing process of claim 1, wherein: in step S05, the spot color separation of the image to be printed specifically includes the following steps:
s051, carrying out image segmentation on the image to be printed after color reduction in the step S04, and separating the foreground color and the background color of the image to be printed into two independent parts;
s052, extracting a spot color according to the separated main hue of the foreground color image;
s053, extracting a spot color according to the separated dominant hue of the background color image, wherein the extraction method is consistent with the step S052;
s054, combining the foreground color and the background color after the spot color is extracted, and carrying out color separation on the four colors of cyan, magenta, yellow and black.
5. The brown paper high saturation color printing process of claim 4, wherein: in step S052, the extraction method measures the color value of the center point of each cell according to the squared figure, removes the color value with the largest error, then takes the arithmetic mean of the remaining color values, and multiplies the arithmetic mean by the extraction coefficient a.
6. The brown paper high saturation color printing process of claim 5, wherein: a is more than or equal to 50 percent and less than or equal to 70 percent.
7. The brown paper high saturation color printing process of claim 1, wherein: the implementation process of printing in the step S07 includes the following steps:
s071, printing solid white ink on the surface of unbleached kraft paper to reduce the influence of chroma of the unbleached kraft paper on color reduction of the printing ink;
s072, printing each spot color ink on the basis of the step S071, wherein the spot color ink is printed on the spot to further reduce the influence of the chroma of the unbleached kraft paper on the color reduction of the printed ink;
s073, printing cyan, magenta, yellow and black inks on the basis of the step S072, wherein the printing sequence of the cyan and magenta two-color inks is determined by the cold and warm tones of the image, namely, the cyan ink is printed firstly on the cold tone pattern, then the magenta, yellow and black inks are printed secondly on the cold tone pattern, the cyan ink, the yellow ink and the black ink are printed secondly on the warm tone pattern, and the opaque ink is adopted for the firstly printed ink, so that the influence of the chroma of the brown paper of the natural color on the subsequent color is reduced;
and S074, printing white ink on the basis of the step S073.
8. The brown paper high saturation color printing process of claim 7, wherein: the printing in step S07 is performed by a flexographic printing press.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114851730A (en) * | 2022-03-28 | 2022-08-05 | 东莞市美盈森环保科技有限公司 | Kraft paper large ink level printing method and kraft paper for packaging |
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| CN101049770A (en) * | 2006-04-04 | 2007-10-10 | 深圳职业技术学院 | Color printing method on surface of metal in high fidelity |
| CN102092206A (en) * | 2010-10-09 | 2011-06-15 | 庞多益 | Method for detecting printing color by using complex frequency spectrum color feature numerical values |
| CN104710858A (en) * | 2013-12-15 | 2015-06-17 | 上海泉灵信息科技有限公司 | Novel R-type pigment radiant blue size ink formula |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101049770A (en) * | 2006-04-04 | 2007-10-10 | 深圳职业技术学院 | Color printing method on surface of metal in high fidelity |
| CN102092206A (en) * | 2010-10-09 | 2011-06-15 | 庞多益 | Method for detecting printing color by using complex frequency spectrum color feature numerical values |
| CN104710858A (en) * | 2013-12-15 | 2015-06-17 | 上海泉灵信息科技有限公司 | Novel R-type pigment radiant blue size ink formula |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114851730A (en) * | 2022-03-28 | 2022-08-05 | 东莞市美盈森环保科技有限公司 | Kraft paper large ink level printing method and kraft paper for packaging |
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