Gravure printing and overprinting process for paper packaging box

Abstract

The invention relates to the technical field of printing, in particular to an intaglio printing and overprinting process for a paper packaging box, which is applied to the printing process of the paper packaging box, adopts an intaglio printing mode, combines a laser engraving technology and a micro-nano manufacturing technology, and accurately engraves a micro-nano pit structure corresponding to an original pattern on an intaglio cylinder. The depth of the pits is controlled within the range of 50 nanometers to 50 micrometers, the shapes include but are not limited to circles, ellipses, polygons and complex geometrical shapes, the arrangement density reaches more than one million per square centimeter, surface textures are customized in a personalized mode according to image layers and color requirements, and printing with high precision, high definition, high stereoscopic impression and excellent touch effect is achieved. The gravure printing and overprinting process for the paper packaging box has the beneficial effects that the laser engraving technology and the micro-nano manufacturing technology are combined, the micro-nano level pit structure can be accurately engraved, and the high-precision, high-definition and high-stereoscopic-impression printing effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of printing, in particular to a gravure printing overprinting process for a paper product packaging box. Background Art

[0002] As an important part of commodity packaging, the printing quality and design effect of paper packaging boxes are directly related to the market competitiveness of products. Although traditional printing technologies, such as offset printing and flexographic printing, can meet basic printing needs, they have limitations in terms of high precision, high definition, high three-dimensional sense and personalized customization. With consumers' increasing pursuit of product quality and design sense, as well as the enhancement of environmental awareness, traditional printing technology has been unable to meet the market's diversified needs for paper packaging boxes.

[0003] As an ancient printing method, gravure printing has broad application prospects in the field of paper packaging box printing with its unique printing effect and process characteristics. However, traditional gravure printing technology also has some problems, such as complex gravure cylinder preparation, ink waste and environmental pollution. In recent years, with the development of laser engraving and micro-nano manufacturing technology, gravure printing technology has made new breakthroughs and upgrades. By combining these advanced technologies, precise engraving and personalized customization of gravure cylinders can be achieved, while reducing ink waste and environmental pollution, and improving printing quality and efficiency. Therefore, it is necessary to propose a gravure printing overprinting process for paper packaging boxes. Summary of the invention

[0004] The object of the present invention is to provide a gravure printing overprinting process for a paper packaging box to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a gravure printing overprinting process for paper packaging boxes, which is applied to the printing process of paper packaging boxes, adopts gravure printing, combines laser engraving and micro-nano manufacturing technology, and accurately engraves a micro-nano-level pit structure corresponding to the original image on the gravure cylinder. The depth of the pit is controlled within the range of 50 nanometers to 50 microns, and the shapes include but are not limited to circles, ellipses, polygons and complex geometric shapes. The arrangement density reaches more than 1 million per square centimeter, and the surface texture is customized according to the image level and color requirements, so as to achieve high-precision, high-definition, high-stereoscopic and excellent tactile printing.

[0006] Preferably, a micro-nano-level pit structure is formed on the surface of the gravure cylinder through laser engraving and micro-nano manufacturing technology. The depth error of the pit is controlled within ±5 nanometers, and the shape accuracy reaches the micron level, so as to better show the layering and color changes of the image, while increasing the three-dimensional sense and touch of the printed matter, so that the visual and tactile experience of the printed matter reaches or exceeds that of similar products on the market.

[0007] Preferably, the process includes an intelligent ink supply and scraping system, which automatically adjusts the ink supply volume between 0.01 ml and 1 ml, controls the scraping force within the range of 0.1 Newton to 10 Newton, and adjusts the ink viscosity within the range of 10 centipoise to 1000 centipoise according to the shape, depth and surface texture of the pits, thereby ensuring that the ink is evenly and completely filled in the pits while avoiding ink waste and environmental pollution.

[0008] Preferably, the process uses a high-precision overprint device, combined with machine vision technology and a closed-loop control system, to monitor and adjust the relative position and movement trajectory of each printing unit in real time, to ensure precise alignment between color layers during multi-color printing, and to control the overprint error within ±0.1 mm, meeting or exceeding high industry standards.

[0009] Preferably, the process includes an adaptive pressure control system, which automatically adjusts the contact pressure between the plate cylinder and the substrate within the range of 0.1 Newtons per square centimeter to 10 Newtons per square centimeter, and controls the contact time between 0.01 seconds and 1 second according to the material, thickness (0.1 mm to 5 mm), hardness and printing speed (1 m / min to 100 m / min) of the substrate, to ensure that the ink is evenly and completely transferred to the substrate while avoiding indentation, breakage and ink splashing problems.

[0010] Preferably, the process uses environmentally friendly inks and adds specific environmentally friendly additives and functional nanomaterials, such as UV inhibitors, antibacterial agents, waterproof agents, and wear-resistant agents to reduce the emission of harmful gases and the generation of wastewater, while giving the printed products additional properties such as UV resistance UPF ≥ 30, antibacterial rate ≥ 99%, waterproof grade ≥ IPX4, and wear resistance ≥ 5000 times.

[0011] Preferably, the process uses high-quality paper or other recyclable materials as the substrate, such as paper with a grammage of 80 g / m2 to 400 g / m2, and performs necessary pretreatments, such as coating: coating thickness is controlled within the range of 5 microns to 50 microns, calendering: gloss improvement is ≥30%, humidification: humidity is controlled within the range of 50%RH to 70%RH, or plasma treatment: treatment time is controlled between 1 second and 10 seconds, so as to improve the smoothness, ink absorbency and printing adaptability of the paper.

[0012] Preferably, the process includes a set of print quality detection and feedback system, which uses high-precision sensors, machine vision technology and big data analysis technology to monitor the color deviation ΔE≤2, clarity: resolution ≥300dpi, overprint accuracy within ±0.1 mm, surface texture uniformity: coefficient of variation ≤5% and additional key performance indicators of the printed products in real time, and automatically adjusts the printing parameters or triggers the alarm mechanism according to the detection results to ensure that product quality meets or exceeds customer requirements.

[0013] Preferably, the process adopts an automated and intelligent control system to achieve precise control and real-time monitoring of the printing process, including but not limited to the automation and intelligence of ink supply, ink scraping, overprinting, pressure control, and quality inspection. It also supports remote monitoring: monitoring range ≥100 meters, fault diagnosis: diagnostic accuracy ≥90%, data analysis and production optimization: production efficiency improvement ≥20%.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The gravure printing overprinting process for paper packaging boxes proposed in the present invention, combined with laser engraving and micro-nano manufacturing technology, can accurately engrave micro-nano-level pit structures to achieve high-precision, high-definition and high-stereoscopic printing effects. This printing effect not only improves the visual beauty of paper packaging boxes, but also enhances the market competitiveness of products.

[0015] The intelligent ink supply and scraping system can automatically adjust the ink supply according to the shape, depth and surface texture of the pits, ensuring that the ink is evenly and completely filled in the pits while avoiding ink waste. In addition, the selection of environmentally friendly inks and the addition of specific environmentally friendly additives can reduce the emission of harmful gases and the generation of wastewater, thereby reducing pollution to the environment.

[0016] The application of high-precision overprinting devices and adaptive pressure control systems can monitor and adjust the relative position and movement trajectory of each printing unit in real time, ensuring accurate alignment between color layers during multi-color printing. At the same time, the introduction of automated and intelligent control systems can achieve precise control and real-time monitoring of the printing process, improve production efficiency, and reduce labor costs and energy consumption.

[0017] Through laser engraving and micro-nano manufacturing technology, customized services can be provided according to customer needs, such as special material printing, personalized pattern design, anti-counterfeiting logos and smart labels, etc. This personalized customization service not only meets consumers' pursuit of product quality and design, but also enhances the brand value and market competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the technical architecture of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] For example, see Figure 1 The present invention provides a technical solution: a gravure printing overprinting process for a paper packaging box, which is applied to the printing process of the paper packaging box, adopts gravure printing, combines laser engraving and micro-nano manufacturing technology, and accurately engraves a micro-nano-level pit structure corresponding to the original image and text on the gravure cylinder, the depth of the pit is controlled within the range of 50 nanometers to 50 microns, and the shapes include but are not limited to circles, ellipses, polygons and complex geometric shapes, with an arrangement density of more than 1 million per square centimeter, and the surface texture is customized according to the image level and color requirements, to achieve high-precision, high-definition, high-stereoscopic and excellent tactile printing.

[0021] The surface of the gravure cylinder is formed into a micro-nano level pit structure through laser engraving and micro-nano manufacturing technology. The depth error of the pit is controlled within ±5 nanometers, and the shape accuracy reaches the micron level, so as to better show the layering and color changes of the image, while increasing the three-dimensional sense and touch of the printed matter, so that the visual and tactile experience of the printed matter reaches or exceeds that of similar products on the market.

[0022] The process includes an intelligent ink supply and scraping system, which automatically adjusts the ink supply between 0.01 ml and 1 ml according to the shape, depth and surface texture of the pits, controls the scraping force between 0.1 Newton and 10 Newtons, and adjusts the ink viscosity between 10 centipoise and 1000 centipoise, ensuring that the ink is evenly and completely filled in the pits while avoiding ink waste and environmental pollution.

[0023] The process uses a high-precision overprint device, combined with machine vision technology and a closed-loop control system, to monitor and adjust the relative position and movement trajectory of each printing unit in real time, ensuring precise alignment between color layers during multi-color printing. The overprint error is controlled within ±0.1 mm, meeting or exceeding high industry standards.

[0024] The process includes an adaptive pressure control system, which automatically adjusts the contact pressure between the plate cylinder and the substrate within the range of 0.1 N / cm2 to 10 N / cm2 and the contact time between 0.01 and 1 second, depending on the substrate’s material, thickness (0.1 to 5 mm), hardness and printing speed (1 to 100 m / min). This ensures that the ink is evenly and completely transferred to the substrate, while avoiding indentation, breakage and ink splashing.

[0025] This process uses environmentally friendly inks and adds specific environmentally friendly additives and functional nanomaterials, such as UV inhibitors, antibacterial agents, waterproof agents, and wear-resistant agents to reduce the emission of harmful gases and the generation of wastewater, while giving the printed products additional properties such as UV resistance UPF ≥ 30, antibacterial rate ≥ 99%, waterproof grade ≥ IPX4, and wear resistance ≥ 5000 times.

[0026] This process uses high-quality paper or other recyclable materials as the substrate, such as paper with a grammage of 80 g / m2 to 400 g / m2, and performs necessary pretreatments, such as coating: coating thickness is controlled within the range of 5 microns to 50 microns, calendering: glossiness is improved by ≥30%, humidification: humidity is controlled within the range of 50%RH to 70%RH, or plasma treatment: treatment time is controlled between 1 second and 10 seconds, in order to improve the smoothness, ink absorbency and printing adaptability of the paper.

[0027] The process includes a set of print quality detection and feedback systems, which use high-precision sensors, machine vision technology and big data analysis technology to monitor the color deviation of printed products ΔE≤2, clarity: resolution ≥300dpi, overprint accuracy within ±0.1 mm, surface texture uniformity: coefficient of variation ≤5% and additional key performance indicators in real time, and automatically adjust printing parameters or trigger an alarm mechanism based on the detection results to ensure that product quality meets or exceeds customer requirements.

[0028] The process adopts an automated and intelligent control system to achieve precise control and real-time monitoring of the printing process, including but not limited to the automation and intelligence of ink supply, ink scraping, overprinting, pressure control, and quality inspection. It also supports remote monitoring: monitoring range ≥100 meters, fault diagnosis: diagnostic accuracy ≥90%, data analysis and production optimization: production efficiency improvement ≥20%.

[0029] Embodiment 2, based on embodiment 1, proposes the application of gravure printing overprinting technology for food packaging boxes.

[0030] This embodiment aims to demonstrate a gravure printing overprint technology applied to food packaging boxes. By combining laser engraving and micro-nano manufacturing technology, high-precision, high-definition and high-three-dimensional printing effects can be achieved, while meeting food safety standards and enhancing the market competitiveness of products.

[0031] Gravure cylinder preparation: Laser engraving technology is used to accurately engrave micro-nano pit structures corresponding to the original image and text on the gravure cylinder. The pit depth is controlled within the range of 50 nanometers to 20 micrometers, the shape is a combination of circular and elliptical, and the arrangement density is 2 million per square centimeter. The surface texture is customized according to the design requirements of the food packaging box, such as simulating natural wood texture or abstract patterns.

[0032] Ink selection and supply: Select environmentally friendly ink that meets food safety standards and add anti-ultraviolet and anti-wear agents. The intelligent ink supply and scraping system automatically adjusts the ink supply according to the shape and depth of the pit to ensure that the ink is evenly filled in the pit.

[0033] Printing process: The substrate is food-grade paper with a grammage of 200 g / m2, which is pre-treated by coating and calendering. A high-precision overprint device is used, combined with machine vision technology and a closed-loop control system to ensure precise alignment during multi-color printing. The adaptive pressure control system automatically adjusts the contact pressure and contact time according to the paper thickness and printing speed.

[0034] Quality inspection and feedback: The print quality inspection and feedback system monitors the color deviation, clarity, overprint accuracy and surface texture uniformity of the print in real time. It automatically adjusts the printing parameters according to the inspection results to ensure that the product quality meets customer requirements.

[0035] Product application: The printed food packaging box has excellent visual effects and tactile experience, while meeting food safety standards. It can be used to package various foods, such as cakes, candies, biscuits, etc., to enhance the product's appeal and market competitiveness.

[0036] Embodiment 3, based on embodiment 1, proposes the application of gravure printing overprinting technology for electronic product packaging boxes.

[0037] This embodiment aims to demonstrate a gravure printing overprint technology applied to electronic product packaging boxes. By combining laser engraving and micro-nano manufacturing technology, high-precision, high-definition and high-three-dimensional printing effects can be achieved. At the same time, the packaging box is given anti-static, anti-electromagnetic interference and other functions, thereby improving the quality and safety of the product.

[0038] Gravure cylinder preparation: Laser engraving technology is used to accurately engrave micro-nano-scale pit structures corresponding to the original image and text on the gravure cylinder. The pit depth is controlled within the range of 100 nanometers to 50 micrometers, and the shape is a combination of polygons and complex geometric shapes, with an arrangement density of 5 million per square centimeter. The surface texture is customized according to the design requirements of the electronic product packaging box, such as simulating metal texture or technological style patterns.

[0039] Ink selection and supply: Select ink that meets environmental protection requirements and add antistatic agent and anti-electromagnetic interference agent. The intelligent ink supply and scraping system automatically adjusts the ink supply according to the shape and depth of the pit to ensure that the ink is evenly filled in the pit.

[0040] Printing process: The substrate is made of hardboard with a grammage of 300 g / m2, which is pre-treated by humidification and plasma treatment. A high-precision overprint device is used, combined with machine vision technology and a closed-loop control system to ensure precise alignment during multi-color printing. The adaptive pressure control system automatically adjusts the contact pressure and contact time according to the thickness of the paperboard and the printing speed.

[0041] Quality inspection and feedback: The print quality inspection and feedback system monitors the color deviation, clarity, overprint accuracy and surface texture uniformity of the print in real time. It automatically adjusts the printing parameters according to the inspection results to ensure that the product quality meets customer requirements.

[0042] Product application: The printed electronic product packaging box has excellent visual effects and tactile experience, and also has anti-static, anti-electromagnetic interference and other functions. It can be used to package various electronic products, such as mobile phones, tablet computers, laptops, etc., to improve product quality and safety, and enhance consumers' trust in the product.

[0043] Embodiment 4, based on embodiment 1, proposes a process of gravure printing overprinting process for paper product packaging boxes, and the process applies the gravure printing overprinting process for paper product packaging boxes to print and produce paper product packaging boxes.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gravure printing overprinting process for paper packaging boxes, characterized in that: This process is applied to the printing process of paper packaging boxes. It adopts gravure printing, combined with laser engraving and micro-nano manufacturing technology, to accurately engrave a micro-nano-level pit structure corresponding to the original image on the gravure cylinder. The depth of the pit is controlled in the range of 50 nanometers to 50 microns. The shapes include but are not limited to circles, ovals, polygons and complex geometric shapes. The arrangement density reaches more than 1 million per square centimeter. The surface texture is customized according to the image level and color requirements to achieve high-precision, high-definition, high-three-dimensional and excellent tactile printing.

2. A paper packaging box gravure printing overprinting process according to claim 1, characterized in that: The surface of the gravure cylinder is formed into a micro-nano level pit structure through laser engraving and micro-nano manufacturing technology. The depth error of the pit is controlled within ±5 nanometers, and the shape accuracy reaches the micron level, so as to better show the layering and color changes of the image, while increasing the three-dimensional sense and touch of the printed matter, so that the visual and tactile experience of the printed matter reaches or exceeds that of similar products on the market.

3. The gravure printing overprinting process for paper packaging boxes according to claim 1, characterized in that: The process includes an intelligent ink supply and scraping system, which automatically adjusts the ink supply between 0.01 ml and 1 ml according to the shape, depth and surface texture of the pits, controls the scraping force between 0.1 Newton and 10 Newtons, and adjusts the ink viscosity between 10 centipoise and 1000 centipoise, ensuring that the ink is evenly and completely filled in the pits while avoiding ink waste and environmental pollution.

4. The gravure printing overprinting process for paper packaging boxes according to claim 1, characterized in that: The process uses a high-precision overprint device, combined with machine vision technology and a closed-loop control system, to monitor and adjust the relative position and movement trajectory of each printing unit in real time, ensuring precise alignment between color layers during multi-color printing. The overprint error is controlled within ±0.1 mm, meeting or exceeding high industry standards.

5. The gravure printing overprinting process for paper packaging boxes according to claim 1, characterized in that: The process includes an adaptive pressure control system, which automatically adjusts the contact pressure between the plate cylinder and the substrate within the range of 0.1 N / cm2 to 10 N / cm2 and the contact time between 0.01 and 1 second, depending on the substrate’s material, thickness (0.1 to 5 mm), hardness and printing speed (1 to 100 m / min). This ensures that the ink is evenly and completely transferred to the substrate, while avoiding indentation, breakage and ink splashing.

6. The gravure printing overprinting process for paper packaging boxes according to claim 1, characterized in that: This process uses environmentally friendly inks and adds specific environmentally friendly additives and functional nanomaterials, such as UV inhibitors, antibacterial agents, waterproof agents, and wear-resistant agents to reduce the emission of harmful gases and the generation of wastewater, while giving the printed products additional properties such as UV resistance UPF ≥ 30, antibacterial rate ≥ 99%, waterproof grade ≥ IPX4, and wear resistance ≥ 5000 times.

7. The gravure printing overprinting process for paper packaging boxes according to claim 1, characterized in that: This process uses high-quality paper or other recyclable materials as the substrate, such as paper with a grammage of 80 g / m2 to 400 g / m2, and performs necessary pretreatments, such as coating: coating thickness is controlled within the range of 5 microns to 50 microns, calendering: glossiness is improved by ≥30%, humidification: humidity is controlled within the range of 50%RH to 70%RH, or plasma treatment: treatment time is controlled between 1 second and 10 seconds, in order to improve the smoothness, ink absorbency and printing adaptability of the paper.

8. The gravure printing overprinting process for paper packaging boxes according to claim 1, characterized in that: The process includes a set of print quality detection and feedback systems, which use high-precision sensors, machine vision technology and big data analysis technology to monitor the color deviation of printed products ΔE≤2, clarity: resolution ≥300dpi, overprint accuracy within ±0.1 mm, surface texture uniformity: coefficient of variation ≤5% and additional key performance indicators in real time, and automatically adjust printing parameters or trigger an alarm mechanism based on the detection results to ensure that product quality meets or exceeds customer requirements.

9. The gravure printing overprinting process for paper packaging boxes according to claim 1, characterized in that: The process adopts an automated and intelligent control system to achieve precise control and real-time monitoring of the printing process, including but not limited to the automation and intelligence of ink supply, ink scraping, overprinting, pressure control, and quality inspection. It also supports remote monitoring: monitoring range ≥100 meters, fault diagnosis: diagnostic accuracy ≥90%, data analysis and production optimization: production efficiency improvement ≥20%.

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