CN-119682374-B - Rotary press and rotary press method for books and periodicals

CN119682374BCN 119682374 BCN119682374 BCN 119682374BCN-119682374-B

Abstract

The application provides a rotary press and a rotary press method for books and periodicals, which are characterized by collecting printed images after primary color overprinting, identifying graphic-text deviation of the primary color overprinting from the printed images, determining dot expansion values of color dots after the primary color overprinting under the condition that ink is emulsified according to the optical density of a printed area after the primary color overprinting, determining pigment combination degree of the ink between the secondary color overprinting and the primary color overprinting according to the dot expansion values and the graphic-text deviation, and determining the color combination degree of the ink in a fountain solution in the process of the primary color overprinting And determining the pressure compensation amount of the secondary color overprinting based on the pigment combination degree and the paste defect, and controlling the book and periodical rotary printing machine to carry out the secondary color overprinting according to the pressure compensation amount. By adopting the scheme of the application, the screen dot size of the printing ink can be adjusted in real time in multicolor printing, so that the quality of books and periodicals after rotary printing is improved.

Inventors

YANG YINGSHUN
FENG JU
FAN GUANGPING
ZHOU SONGYANG
YI HUIBIN
GAO QIAOMU
CHEN JINTIAN
LUO TIANHUA
CHEN FUPENG

Assignees

广东新华印刷有限公司

Dates

Publication Date: 20260508
Application Date: 20241223

Claims (10)

1. The utility model provides a polychrome printing method of books and periodicals rotary press, books and periodicals rotary press is including printing mechanism, vision perception mechanism and arm, its characterized in that, polychrome printing method includes: starting a printing mechanism of the book and periodical rotary printing machine to carry out primary color overprinting, and collecting a printing image after primary color overprinting through the visual perception mechanism; identifying the image-text deviation of the first color overprinting from the printing image; acquiring the optical density of a printing area after the first color overprinting, determining a dot expansion value of color dots after the first color overprinting under the condition that the ink is emulsified according to the optical density, and predicting the overprinting result of the second color overprinting according to the dot expansion value and the image-text deviation to obtain the pigment combination degree of the ink between the second color overprinting and the first color overprinting; according to the first color overprinting process in the fountain solution Predicting the paste defect of the secondary color overprinting by the residue deposition amount of the shaped sediment and the preset pressure of the mechanical arm in the secondary color overprinting process; And determining the pressure compensation amount of the mechanical arm in the secondary color overprinting based on the pigment combination degree and the plate pasting defect, and controlling the book and periodical rotary printing machine to carry out the secondary color overprinting according to the pressure compensation amount.
2. The method of claim 1, wherein identifying the first color overprinted graphic deviation from the printed image comprises: Determining an edge curve in the printed image; And determining the image-text deviation of the printed area pattern after the first color overprinting according to the edge curve and the preset printed pattern.
3. The method of claim 1, wherein determining the dot gain value of the color dot under emulsification of the ink after the first color overprinting based on the optical density comprises: Acquiring the field density of the printing paper; Determining blank reflectivity of the unprinted part after the first color overprinting according to the paper density; determining the printing reflectivity of the printing area after the first color overprinting according to the optical density; and determining a dot expansion value of the color dots under the condition that the ink is emulsified after the first color overprinting according to the blank reflectivity and the printing reflectivity.
4. The method of claim 1, wherein predicting the overprinting result of the secondary color overprinting based on the dot gain and the graphic deviation to obtain the pigment binding degree of the ink between the secondary color overprinting and the primary color overprinting specifically comprises: Obtaining the component content and the drying speed of the secondary color overprinting ink; determining the ink binding degree according to the component content and the drying speed; determining an emulsification penalty according to the dot expansion value and the image-text deviation; And determining the pigment binding degree of the ink between the secondary color overprinting and the primary color overprinting according to the ink binding degree and the emulsification penalty.
5. The method of claim 1, wherein the color is applied according to the initial color of the fountain solution during overprinting The residue deposition amount of the shaped sediment and the preset pressure of the mechanical arm in the secondary color overprinting process predict the paste defect of the secondary color overprinting specifically comprises: determining the original liquid of the fountain solution in the process of first color overprinting A residue deposition amount of the deposit; acquiring preset pressure of the mechanical arm in the process of secondary color overprinting and viscosity of the printing ink in the process of secondary color overprinting; Determining a predicted laminar flow coefficient of the ink in the secondary color overprinting process according to the dot expansion value in the primary color overprinting, the preset pressure of the mechanical arm in the secondary color overprinting process and the viscosity of the ink in the secondary color overprinting process; And determining the paste defects of the secondary color overprinting according to the residue deposition amount and the predicted laminar flow coefficient.
6. The method of claim 5, wherein the determination of the level of fountain solution is based on the original level of fountain solution during the first color overprinting process The residue deposition amount of the deposit-like substance specifically includes: acquiring the pH value, the surface tension and the conductivity of the fountain solution in the process of the first color overprinting, and taking the pH value, the surface tension and the conductivity as the raw liquid performance of the fountain solution in the process of the first color overprinting; Determining the deposition amount of the acid and the alkali according to the pH value and the preset optimal pH value; determining a tension deposition amount according to the surface tension and a preset optimal tension; Determining the fountain solution based on the acid-base deposition amount, the tension deposition amount, and the conductivity Residue deposition amount of the deposit.
7. The method of claim 1, wherein determining a pressure compensation amount of the robotic arm in secondary color overprinting based on the pigment bonding and the paste defects specifically comprises: determining a pressure-adjusted threshold value based on the pigment bonding degree and the plate-pasting defect; comparing the pressure-adjusted limiting value with a preset limiting threshold, and setting the pressure compensation amount of the mechanical arm in the secondary color overprinting to be 0 when the limiting value is smaller than or equal to the limiting threshold; and when the defined value is larger than the defined threshold value, determining the pressure compensation amount of the mechanical arm in the secondary color overprinting according to the defined value and the defined threshold value.
8. The utility model provides a books and periodicals rotary press, this books and periodicals rotary press is including printing mechanism, visual perception mechanism, arm and control unit, its characterized in that, control unit includes: The acquisition module is used for controlling the visual perception mechanism to acquire the printed image after the first color overprinting after the printing mechanism of the book and periodical rotary printing machine is started to carry out the first color overprinting; the processing module is used for identifying the image-text deviation of the first color overprinting from the printing image; The processing module is also used for obtaining the optical density of the printing area after the first color overprinting, determining a dot expansion value of the color dots after the first color overprinting under the condition that the ink is emulsified according to the optical density, and predicting the overprinting result of the second color overprinting according to the dot expansion value and the image-text deviation to obtain the pigment combination degree of the ink between the second color overprinting and the first color overprinting; the processing module is also used for processing the color of the fountain solution in the process of overprinting according to the first color Predicting the paste defect of the secondary color overprinting by the residue deposition amount of the shaped sediment and the preset pressure of the mechanical arm in the secondary color overprinting process; And the execution module is used for determining the pressure compensation quantity of the mechanical arm in the secondary color overprinting based on the pigment combination degree and the plate pasting defect, and further controlling the book and periodical rotary printing machine to carry out the secondary color overprinting according to the pressure compensation quantity.
9. A computer device comprising a memory storing code and a processor configured to obtain the code and to perform the multicolor printing method of the book-press of any of claims 1 to 7.
10. A computer-readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the multicolor printing method of a rotary press according to any of claims 1 to 7.

Description

Rotary press and rotary press method for books and periodicals Technical Field The application relates to the technical field of industrial printing control, in particular to a book and periodical rotary printing machine and a method. Background Industrial printing control refers to real-time monitoring, adjusting and optimizing of various process parameters, equipment running states and printing quality of a printing machine through hardware and software technologies in the industrial printing production process so as to ensure efficient production and maintain consistency of the printing quality. Industrial printing control involves various aspects such as automation of the printing press, accurate control of the production process, and quality management, and conventionally, in the industrial printing control process, the printing quality is monitored in real time by a visual sensing mechanism, and each mechanism in the industrial printing press is automatically controlled to operate according to the monitored result. Along with the development of technology, industrial robots are increasingly widely applied in the printing industry, and the automation and intelligent processes of rotary printing of books and periodicals are promoted by improving production efficiency, reducing labor cost, improving printing quality and the like, for example, the rotary printing machine of books and periodicals can be used for intelligent printing of paper publications such as books, magazines and newspapers through the integrated industrial robots, so that manual intervention is reduced, and production efficiency is improved. In addition, a printing mode commonly used in a rotary press for books and periodicals is CMYK (Cyan, magenta, yellow, black) printing, and three pigments of Yellow (Yellow), magenta (Magenta) and Cyan (Cyan) are superimposed according to different proportions to absorb different wavelengths in a spectrum to generate various colors. Black (Black) is used to enhance the depth and contrast of an image, which is printed with yellow, magenta, cyan and Black plates respectively by a four-color separation printer, and inks are superimposed on paper in different dot sizes and shapes to visually form a continuous tone, however, in actual production, the dot size of each color ink varies due to ink emulsification, the color of the combined ink with different colors deviates from the expected color, and too large dots can cause paste, so that how to adjust the dot size of the ink in real time in multicolor printing, thereby improving the quality of books and periodicals after rotary printing becomes a difficult problem in the industry. Disclosure of Invention The application provides a book and periodical rotary printing machine and a method, which can adjust the dot sizes of printing ink in real time in multicolor printing so as to ensure that the printing ink with different colors can be combined to present expected colors, thereby improving the quality of books and periodicals after rotary printing. In a first aspect, the present application provides a multicolor printing method of a rotary press for books and periodicals, the rotary press for books and periodicals including a printing mechanism, a visual perception mechanism and a mechanical arm, the multicolor printing method comprising: starting a printing mechanism of the book and periodical rotary printing machine to carry out primary color overprinting, and collecting a printing image after primary color overprinting through the visual perception mechanism; identifying the image-text deviation of the first color overprinting from the printing image; acquiring the optical density of a printing area after the first color overprinting, determining a dot expansion value of color dots after the first color overprinting under the condition that the ink is emulsified according to the optical density, and predicting the overprinting result of the second color overprinting according to the dot expansion value and the image-text deviation to obtain the pigment combination degree of the ink between the second color overprinting and the first color overprinting; according to the first color overprinting process in the fountain solution Predicting the paste defect of the secondary color overprinting by the residue deposition amount of the shaped sediment and the preset pressure of the mechanical arm in the secondary color overprinting process; And determining the pressure compensation amount of the mechanical arm in the secondary color overprinting based on the pigment combination degree and the plate pasting defect, and controlling the book and periodical rotary printing machine to carry out the secondary color overprinting according to the pressure compensation amount. In some embodiments, identifying the first color overprinted graphic deviation from the printed image specifically includes: Determining an edge curve in the printed image; And determining the i