Printing process for ingredient surface of external packaging carton

Abstract

The invention relates to the technical field of paper box ingredient surface printing, and discloses an outer packing paper box ingredient surface printing technology which comprises the following steps that firstly, a paper box is pretreated; 2, manufacturing and debugging a printing plate; step 3, blending and supplying printing ink; the printing precision is high, specifically, the surface adhesive force of the paper box is improved through plasma pretreatment, the CTP plate making technology and the combined printing mode are combined, fine characters and symbols in the ingredient table can be clearly restored, the resolution can reach 2400-4800 dpi, and the problems of fuzzy characters and ghosting of the ingredient table in the prior art are effectively solved; the printing efficiency is high, the printing mode combining flexographic printing and offset printing is utilized, the characteristics of different printing contents are considered, the printing speed can reach 100-300 m / min, meanwhile, the printing plate manufacturing time is shortened through the computer direct plate making technology, and the overall production efficiency is improved by 30% or above compared with a traditional technology.

Description

Technical Field

[0001] This application relates to the technical field of printing ingredient lists for paper boxes, and in particular to a printing process for ingredient lists of outer packaging paper boxes. Background Technology

[0002] In the production process of outer packaging paper boxes, ingredient list printing is a crucial step. It not only needs to ensure the clarity and legibility of text and numbers, but also needs to meet requirements such as precise printing position, error-free content, and wear resistance. Currently, the commonly used ingredient list printing processes for outer packaging paper boxes include offset printing, flexographic printing, and screen printing.

[0003] However, in practical applications, most existing offset printing processes, while achieving high printing precision, suffer from cumbersome procedures and long plate changeover times, making them poorly suited for printing small batches and multiple product ingredient lists. Flexographic printing offers the advantage of high printing speed, but its printing resolution is relatively low, easily resulting in blurring and ghosting of small text and symbols in ingredient lists. Screen printing produces a thick ink layer with good wear resistance, but its printing efficiency is low, and it is difficult to achieve fine graphic printing. It also suffers from serious ink waste and poor environmental performance.

[0004] Therefore, those skilled in the art have provided a printing process for the ingredient list of outer packaging paper boxes to solve the problems mentioned in the background art. Summary of the Invention

[0005] To address the issues raised in the background section regarding offset printing (which achieves high printing precision but suffers from cumbersome processes and long plate-changing times, making it unsuitable for small-batch, multi-variety ingredient list printing), flexographic printing (offset printing offers high printing speed but has relatively low resolution, easily resulting in blurring and ghosting of small text and symbols in ingredient lists), and screen printing (which produces thick ink layers with good wear resistance but suffers from low printing efficiency and difficulty in achieving fine graphic printing, while also exhibiting significant ink waste and poor environmental performance), this application provides an ingredient list printing process for outer packaging paper boxes.

[0006] This application provides a printing process for the ingredient list of outer packaging paper boxes, which adopts the following technical solution: including the following steps:

[0007] Step 1: Cardboard box pretreatment;

[0008] Step Two: Plate Making and Adjustment;

[0009] Step 3: Ink preparation and supply;

[0010] Step 4: Printing operation;

[0011] Step 5: Curing treatment;

[0012] Step Six: Finished Product Inspection and Sorting.

[0013] Preferably, the pretreatment of the cardboard box involves cleaning the surface of the outer packaging cardboard box to be printed, removing dust, oil and other impurities, and then using a plasma treatment device to treat the printing area of ​​the cardboard box with plasma. Through the physical and chemical interaction between the plasma and the surface of the cardboard box, the tension and adhesion of the cardboard box surface are improved. The treatment time is controlled within 10-30 seconds, and the plasma power is 100-300W.

[0014] Preferably, the printing plate making and debugging involves creating the printing plate using Computer-to-Plate (CTP) technology based on the contents and layout requirements of the ingredient list. The resolution of the printing plate is set to 2400-4800 dpi to ensure accurate reproduction of the text and symbols in the ingredient list. The prepared printing plate is then installed on the printing plate cylinder of the printing press, and the position and pressure of the printing plate are calibrated to ensure uniform contact pressure between the printing plate and the surface of the paper box, with the pressure value controlled between 0.1-0.3 MPa.

[0015] Preferably, the ink preparation and supply uses environmentally friendly water-based ink. The water-based ink is tinted according to the color requirements of the printing according to the ingredient list. During the tinting process, a colorimeter is used to monitor the ink's color parameters in real time to ensure color accuracy. The prepared ink is then added to the printing press's ink supply system. The ink supply system uses a constant pressure ink supply method to ensure the stability of the ink supply, and the ink viscosity is controlled between 20 and 50 mPa·s.

[0016] Preferably, the printing operation involves feeding the pre-treated outer packaging cardboard box into the paper feeding mechanism of the printing press. The printing press employs a combined flexographic and offset printing method. For large color blocks in the ingredient list, flexographic printing is used, taking advantage of its thick ink layer and fast printing speed. For fine text and symbols in the ingredient list, offset printing is used to ensure printing accuracy. The printing speed is controlled between 100 and 300 m / min. During the printing process, a visual inspection system monitors the printing quality in real time. If defects such as missing prints, ghosting, or blurred text are detected, an alarm is issued and printing is suspended immediately.

[0017] Preferably, the curing process involves the printed cardboard box entering a curing device and employing a composite curing method combining ultraviolet (UV) curing and hot air drying. First, the printed ink layer is pre-cured using a UV curing device with a UV lamp power of 80-120W / cm and a curing time of 1-3 seconds. Then, it enters a hot air drying channel where the hot air temperature is controlled at 40-60℃ and the drying time is 5-10 seconds, ensuring complete curing of the ink layer and improving the abrasion resistance and adhesion of the printed layer on the ingredient list.

[0018] Preferably, the finished product inspection and sorting involves inspecting the cured cardboard boxes using a combination of manual and machine inspection. This includes checking the accuracy and clarity of the printed information on the ingredient list, the precision of the printing positions, and whether there are any issues such as ink peeling or fading. Qualified cardboard boxes are then sorted and stacked, while unqualified products are reworked.

[0019] In summary, this application includes the following beneficial technical effects:

[0020] 1. High printing precision: By adopting plasma pretreatment to improve the adhesion of the paper box surface, combined with CTP plate making technology and combined printing methods, it can clearly reproduce the fine text and symbols in the ingredient list, with a resolution of 2400-4800dpi, effectively solving the problems of blurry text and ghosting in the ingredient list in the existing process.

[0021] 2. High printing efficiency: Utilizing a combination of flexographic and offset printing methods, it takes into account the characteristics of different printing content, and the printing speed can reach 100-300m / min. At the same time, computer-to-plate technology shortens the plate making time, and the overall production efficiency is increased by more than 30% compared with traditional processes.

[0022] 3. Strong adaptability: The plasma pretreatment process can be adapted to different materials (such as cardboard, corrugated paper, laminated paper, etc.) and different thicknesses of outer packaging boxes, ensuring the stability of printing effect on various types of boxes.

[0023] 4. Environmental protection and energy saving: Environmentally friendly water-based inks are used, which reduces the emission of volatile organic compounds (VOCs). At the same time, a composite curing method of UV curing and hot air drying is adopted, which has a short curing time and low energy consumption, in line with the development trend of green printing.

[0024] 5. Stable printing quality: Through dual control of visual inspection system and finished product inspection, as well as constant pressure ink supply and precise printing plate adjustment, the printing defect rate is effectively reduced and the product yield is improved. Detailed Implementation

[0025] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] This application discloses a printing process for the ingredient list of an outer packaging paper box, including the following steps:

[0027] Step 1: Cardboard box pretreatment;

[0028] Step Two: Plate Making and Adjustment;

[0029] Step 3: Ink preparation and supply;

[0030] Step 4: Printing operation;

[0031] Step 5: Curing treatment;

[0032] Step Six: Finished Product Inspection and Sorting.

[0033] In this application, the pretreatment of the paper box involves cleaning the surface of the outer packaging paper box to be printed, removing dust, oil and other impurities. Then, a plasma treatment device is used to treat the printing area of ​​the paper box with plasma. Through the physical and chemical interaction between plasma and the paper box surface, the tension and adhesion of the paper box surface are improved. The treatment time is controlled between 10 and 30 seconds, and the plasma power is 100 to 300W.

[0034] In this application, the printing plate making and debugging are carried out using computer-to-plate (CTP) technology based on the contents and layout requirements of the ingredient list. The resolution of the printing plate is set to 2400-4800 dpi to ensure the accurate reproduction of the text and symbols in the ingredient list. The prepared printing plate is then installed on the printing plate cylinder of the printing press, and the position and pressure of the printing plate are calibrated to ensure uniform contact pressure between the printing plate and the surface of the paper box, with the pressure value controlled between 0.1 and 0.3 MPa.

[0035] In this application, environmentally friendly water-based inks are selected for ink preparation and supply. The water-based inks are tinted according to the color requirements of the printing process, and a colorimeter is used to monitor the ink's color parameters in real time during the tinting process to ensure color accuracy. The prepared ink is then added to the printing press's ink supply system, which employs a constant pressure ink supply method to ensure stable ink supply. The ink viscosity is controlled between 20 and 50 mPa·s.

[0036] In this application, the printing operation involves feeding the pre-treated outer packaging cardboard box into the paper feeding mechanism of the printing press. The printing press employs a combined flexographic and offset printing method. For large color blocks in the ingredient list, flexographic printing is used, taking advantage of its thick ink layer and high printing speed. For fine text and symbols in the ingredient list, offset printing is used to ensure printing accuracy. The printing speed is controlled between 100 and 300 m / min. During the printing process, a visual inspection system monitors the printing quality in real time. If defects such as missing prints, ghosting, or blurred text are detected, an alarm is issued and printing is suspended immediately.

[0037] In this application, the curing process involves the printed cardboard box entering a curing device and employing a composite curing method combining ultraviolet (UV) curing and hot air drying. First, the printed ink layer is pre-cured using a UV curing device with a UV lamp power of 80-120W / cm and a curing time of 1-3 seconds. Then, it enters a hot air drying channel where the hot air temperature is controlled at 40-60℃ and the drying time is 5-10 seconds, ensuring complete curing of the ink layer and improving the abrasion resistance and adhesion of the printed layer on the ingredient list.

[0038] In this application, finished product inspection and sorting involves inspecting the cured cardboard boxes using a combination of manual and machine inspection to check the accuracy and clarity of the printed information on the ingredient list, the precision of the printing position, and whether there are any issues such as ink peeling or fading. Boxes that pass inspection are then sorted and stacked, while substandard products are reworked.

[0039] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description in the specification. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0040] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can refer to mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc., are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

Claims

1. A printing process for the ingredient list of an outer packaging cardboard box, characterized in that, Includes the following steps: Step 1: Cardboard box pretreatment; Step Two: Plate Making and Adjustment; Step 3: Ink preparation and supply; Step 4: Printing operation; Step 5: Curing treatment; Step Six: Finished Product Inspection and Sorting.

2. The printing process for the ingredient list of an outer packaging paper box according to claim 1, characterized in that: The pretreatment of the cardboard box involves cleaning the surface of the outer packaging cardboard box to be printed, removing dust, oil, and other impurities. Then, a plasma treatment device is used to treat the printing area of ​​the cardboard box with plasma. Through the physical and chemical interaction between the plasma and the cardboard box surface, the tension and adhesion of the cardboard box surface are improved. The treatment time is controlled between 10 and 30 seconds, and the plasma power is 100 to 300W.

3. The printing process for the ingredient list of an outer packaging paper box according to claim 1, characterized in that: The plate making and debugging process involves creating a printing plate using Computer-to-Plate (CTP) technology based on the contents and layout requirements of the ingredient list. The plate resolution is set to 2400-4800 dpi to ensure accurate reproduction of the text and symbols in the ingredient list. The prepared printing plate is then installed on the plate cylinder of the printing press, and its position is calibrated and pressure is adjusted to ensure uniform contact pressure between the plate and the paper box surface, with the pressure value controlled between 0.1 and 0.3 MPa.

4. The printing process for the ingredient list of an outer packaging paper box according to claim 1, characterized in that: The ink preparation and supply process uses environmentally friendly water-based inks. The water-based inks are tinted according to the color requirements of the printing process, and a colorimeter is used to monitor the ink's color parameters in real time during the tinting process to ensure color accuracy. The prepared ink is then added to the printing press's ink supply system, which employs a constant pressure ink supply method to ensure stable ink supply. The ink viscosity is controlled between 20 and 50 mPa·s.

5. The printing process for the ingredient list of an outer packaging paper box according to claim 1, characterized in that: The printing operation involves feeding the pre-treated outer packaging boxes into the paper feeding mechanism of the printing press. The printing press employs a combination of flexographic and offset printing. For large color blocks in the ingredient list, flexographic printing is used, taking advantage of its thick ink layer and high printing speed. For fine text and symbols in the ingredient list, offset printing is used to ensure printing accuracy. The printing speed is controlled between 100 and 300 m / min. During the printing process, a visual inspection system monitors the printing quality in real time. If defects such as missing prints, ghosting, or blurred text are detected, an alarm is issued and printing is suspended immediately.

6. The printing process for the ingredient list of an outer packaging paper box according to claim 1, characterized in that: The curing process involves the printed cardboard box entering a curing device, employing a composite curing method combining ultraviolet (UV) curing and hot air drying. First, the printed ink layer is pre-cured using UV curing equipment with a UV lamp power of 80-120W / cm and a curing time of 1-3 seconds. Then, it enters the hot air drying channel, where the hot air temperature is controlled at 40-60℃ and the drying time is 5-10 seconds, ensuring complete curing of the ink layer and improving the abrasion resistance and adhesion of the printed layer on the ingredient list.

7. The printing process for the ingredient list of an outer packaging paper box according to claim 1, characterized in that: The finished product inspection and sorting involves inspecting the cured cardboard boxes using a combination of manual and machine inspection. This includes checking the accuracy and clarity of the printed information on the ingredient list, the precision of the printing positions, and whether there are any issues such as ink peeling or fading. Boxes that pass inspection are then stacked and sorted; those that fail are reworked.