Multi-color overlapping coating process for outer packing carton

Abstract

The invention relates to the technical field of multi-color overlapping coating, and discloses an outer packing carton multi-color overlapping coating process which comprises the following steps: step 1, carton pretreatment; step 2, debugging coating equipment; step 3, coating with a first color; the positioning unit and the visual positioning system are arranged, so that the position of the paper box can be monitored in real time, it is ensured that printing ink of each color is accurately overlapped in a designated area, the problem of registration deviation is effectively avoided, and the definition of patterns and the layering sense of the colors are improved; and the coating quality is good, specifically, the mode of step-by-step coating and step-by-step drying is adopted, drying treatment is conducted immediately after one color is coated every time, the first-coated ink is rapidly and preliminarily cured, the color mixing phenomenon of the later-printed ink and the first-printed ink is avoided, and the purity and vividness of the color are guaranteed. Meanwhile, the overall curing treatment adopts ultraviolet curing, so that the ink is completely cured, and the adhesive force and the wear resistance of the coating are remarkably improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of multi-color overlapping coating, in particular to a multi-color overlapping coating process for outer packaging cartons. BACKGROUND

[0002] In the packaging industry, outer packaging cartons not only protect products, but also bear the functions of brand display and visual promotion. In order to improve the aesthetics and attractiveness of the carton, multi-color coating treatment is often performed on the surface of the carton to form patterns and textures with rich colors and distinct levels.

[0003] At present, the traditional multi-color coating process for outer packaging cartons mainly adopts the overprinting process, that is, different colors of ink are sequentially printed on the surface of the carton through multiple printing plates.

[0004] However, in actual application, registration deviation is prone to occur in most of the existing overprinting processes, resulting in blurred and misaligned phenomena in the color overlapping part, which affects the visual effect. Secondly, the drying speed of ink in the traditional process is slow, and when multi-color overlapping coating is performed, the ink printed later is prone to color mixing with the ink printed earlier, which reduces the purity and brightness of the colors. In addition, the coating efficiency of the traditional process is low, each color requires a separate printing plate and printing process, the production cycle is long, and the production cost is high.

[0005] Therefore, the technical personnel in the field provide a multi-color overlapping coating process for outer packaging cartons to solve the problems raised in the background art. SUMMARY

[0006] In order to solve the problems raised in the background art, such as registration deviation prone to occur in the overprinting process, resulting in blurred and misaligned phenomena in the color overlapping part, affecting the visual effect, secondly, the drying speed of ink in the traditional process is slow, and when multi-color overlapping coating is performed, the ink printed later is prone to color mixing with the ink printed earlier, which reduces the purity and brightness of the colors, and in addition, the coating efficiency of the traditional process is low, each color requires a separate printing plate and printing process, the production cycle is long, and the production cost is high, the application provides a multi-color overlapping coating process for outer packaging cartons.

[0007] The multi-color overlapping coating process for outer packaging cartons provided by the application adopts the following technical scheme: comprising the following steps:

[0008] Step 1: carton pretreatment;

[0009] Step 2: coating equipment debugging;

[0010] Step 3: first color coating;

[0011] Step 4: subsequent color overlapping coating;

[0012] Step five: overall curing treatment;

[0013] Step six: finished product inspection.

[0014] Preferably, the carton pretreatment is to clean the outer packaging carton to be coated, remove dust, oil stains and other impurities on the surface, then polish the surface of the carton to have a certain roughness, enhance the adhesion of ink to the surface of the carton, and finally place the pretreated carton on a fixed clamp to ensure the position of the carton during coating.

[0015] Preferably, the coating equipment debugging is to prepare a multi-color coating equipment, which includes a plurality of coating units, drying units and positioning units arranged in sequence. Each coating unit corresponds to one color of ink, and the coating unit includes an ink supply device, a coating nozzle and a thickness adjusting mechanism. First, the positioning unit is debugged to determine the position of the carton and the coating area by a visual positioning system, then the position, angle and coating thickness of the coating nozzle of each coating unit are adjusted according to the designed pattern and color requirements, and the temperature and drying time of the drying unit are set.

[0016] Preferably, the first color coating is to start the coating equipment, the ink supply device of the first coating unit delivers the corresponding color of ink to the coating nozzle, and the coating nozzle performs the first color coating on the surface of the carton according to the preset path and thickness. After coating, the carton enters the drying unit with the conveying mechanism, and the drying unit quickly dries the area coated with the first color ink, with a drying temperature of 60-80°C and a drying time of 10-20 seconds, so that the first color ink is preliminarily cured.

[0017] Preferably, the subsequent color overlapping coating is to deliver the carton to the next coating unit after completing the first color coating and drying, and the coating unit performs the second color overlapping coating on the basis of the first color ink according to the preset pattern requirements. During coating, the position of the carton is monitored in real time by the positioning unit to ensure that the second color ink is accurately overlapped on the specified area of the first color ink. After coating, it enters the drying unit again for drying, and the drying parameters are the same as those of the first color. According to the above method, the overlapping coating and drying treatment of subsequent colors are completed in turn, and the coating thickness of each color is controlled within 5-10 μm. The width of the overlapping area of adjacent two colors is adjusted according to the design requirements, generally 1-3 mm.

[0018] Preferably, the overall curing treatment is that after the coating and drying of all colors are completed, the carton is transported to the overall curing unit, and the ink on the surface of the carton is treated by overall curing treatment in the form of ultraviolet curing, the wavelength of ultraviolet is 365-405nm, and the curing time is 30-60 seconds, so that the ink is completely cured to form a firm and wear-resistant coating.

[0019] Preferably, the finished product detection is appearance detection of the outer packaging carton after the coating and curing treatment are completed, checking the color overlap accuracy, color uniformity, coating adhesion and wear resistance and other indicators, and the carton that passes the detection is the finished product, and the carton that fails the detection is processed for rework.

[0020] Preferably, in step 1, when the surface of the carton is polished, sandpaper is used for polishing, the mesh number of the sandpaper is 200-400 mesh, and the roughness Ra of the surface of the carton after polishing is 1.6-3.2μm.

[0021] Preferably, in step 2, the coating nozzle adopts a piezoelectric inkjet nozzle, and the nozzle diameter is 10-20μm, which can realize high-precision ink spraying.

[0022] Preferably, in steps 3 and 4, the drying unit adopts a combination of hot air drying and infrared drying, the hot air drying speed is 1-2m / s, and the infrared drying power is 500-1000W, which can quickly and uniformly dry the ink.

[0023] In summary, the present application has the following beneficial technical effects:

[0024] 1. High coating accuracy: by setting the positioning unit and the visual positioning system, the position of the carton can be monitored in real time, ensuring that the ink of each color is accurately overlapped in the specified area, effectively avoiding the problem of register deviation, and improving the clarity of the pattern and the sense of hierarchy of the color.

[0025] 2. Good coating quality: by adopting the step-by-step coating and drying method, the ink of the first coating is quickly and preliminarily cured after each color is coated, avoiding the color mixing phenomenon of the later printed ink and the first printed ink, and ensuring the purity and brightness of the color. At the same time, the overall curing treatment adopts ultraviolet curing, which makes the ink completely cured, and the adhesion and wear resistance of the coating are significantly improved.

[0026] 3. High production efficiency: the process integrates multiple coating units, drying units and positioning units on one production line, realizing continuous production of multi-color coating, and the coating and drying process of each color is fast and efficient, greatly shortening the production cycle and improving the production efficiency.

[0027] 4. Low production cost: the process of the application can accurately control the coating thickness and overlapping area of the ink, reduce the waste of ink, and at the same time, the continuous production mode reduces the labor cost and equipment operation cost, effectively reduces the total production cost of the outer packaging carton. DETAILED DESCRIPTION

[0028] The technical solutions of the application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the application, not all. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0029] The application embodiment discloses a multi-color overlapping coating process for outer packaging carton, which comprises the following steps:

[0030] Step one: carton pretreatment;

[0031] Step two: coating equipment debugging;

[0032] Step three: first color coating;

[0033] Step four: subsequent color overlapping coating;

[0034] Step five: overall curing treatment;

[0035] Step six: finished product detection.

[0036] In the application, the carton pretreatment is to clean the outer packaging carton to be coated, remove dust, oil stains and other impurities on the surface, then polish the surface of the carton to have a certain roughness, enhance the adhesion of the ink and the surface of the carton, and finally place the pretreated carton on the fixing clamp to ensure the position of the carton fixed during coating.

[0037] In the application, the coating equipment debugging is to prepare a multi-color coating equipment, which comprises a plurality of coating units, drying units and positioning units arranged in sequence. Each coating unit corresponds to an ink of a color, and the coating unit comprises an ink supply device, a coating nozzle and a thickness adjusting mechanism. First, the positioning unit is debugged, the position and coating area of the carton are determined by the visual positioning system, then the position, angle and coating thickness of the coating nozzle of each coating unit are adjusted according to the designed pattern and color requirements, and the temperature and drying time of the drying unit are set.

[0038] In this application, the first color coating is to start the coating device, the ink supply device of the first coating unit delivers the corresponding color ink to the coating nozzle, and the coating nozzle performs the first color coating on the surface of the carton according to the preset path and thickness. After coating, the carton enters the drying unit with the conveying mechanism, and the drying unit quickly dries the area coated with the first color ink. The drying temperature is controlled at 60-80℃, and the drying time is 10-20 seconds, so that the first color ink is preliminarily solidified.

[0039] In this application, the subsequent color overlapping coating is to transport the carton to the next coating unit after the first color coating and drying are completed. The coating unit performs the second color overlapping coating on the basis of the first color ink according to the preset pattern requirements. During the coating process, the position of the carton is monitored in real time by the positioning unit to ensure that the second color ink is accurately overlapped on the specified area of the first color ink. After coating, it enters the drying unit again for drying. The drying parameters are the same as those of the first color. According to the above method, the overlapping coating and drying treatment of the subsequent colors are completed in turn. The coating thickness of each color is controlled at 5-10μm, and the width of the overlapping area of the adjacent two colors is adjusted according to the design requirements, generally 1-3mm.

[0040] In this application, the overall solidification treatment is to transport the carton to the overall solidification unit after the coating and drying of all colors are completed. The ink on the surface of the carton is treated by overall solidification using ultraviolet curing. The wavelength of ultraviolet light is 365-405nm, and the solidification time is 30-60 seconds, so that the ink is completely solidified to form a firm and wear-resistant coating.

[0041] In this application, the finished product detection is to detect the appearance of the outer packaging carton after coating and solidification treatment, check the overlapping accuracy of the color, the uniformity of the color, the adhesion and wear resistance of the coating, etc. The carton that meets the detection requirements is the finished product, and the unqualified carton is processed for rework.

[0042] In this application, in step 1, sandpaper is used for polishing the surface of the carton. The grit of the sandpaper is 200-400 grit, and the roughness Ra of the surface of the carton after polishing is 1.6-3.2μm.

[0043] In this application, in step 2, the coating nozzle uses a piezoelectric inkjet nozzle with a nozzle diameter of 10-20μm, which can realize high-precision ink jetting.

[0044] In this application, in steps 3 and 4, the drying unit uses a combination of hot air drying and infrared drying. The hot air drying speed is 1-2m / s, and the infrared drying power is 500-1000W, which can quickly and uniformly dry the ink.

[0045] The standard parts used in the present application can be purchased from the market, and the special-shaped parts can be ordered according to the description and the drawings, and the specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art, the mechanical parts and equipment adopt the conventional type in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, which will not be described in detail here.

[0046] Finally, it should be pointed out that in the description of the present application, it should be pointed out that unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, which can be mechanical connection or electrical connection, or the communication between two elements, or direct connection, "up", "down", "left", "right" and the like are only used to indicate the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may change;

[0047] Secondly: the present application discloses the structure involved in the embodiment of the present application, and the other structures can be referred to the usual design, and the same embodiment and different embodiments of the present application can be combined with each other under the condition of no conflict.

Claims

1. A multi-color overlapping coating process for outer packaging paper boxes, characterized in that, Includes the following steps: Step 1: Cardboard box pretreatment; Step 2: Coating equipment debugging; Step 3: Apply the first color; Step 4: Apply subsequent color overlays; Step 5: Overall curing treatment; Step Six: Finished Product Inspection.

2. The multi-color overlapping coating process for outer packaging paper boxes according to claim 1, characterized in that: The pretreatment of the cardboard box involves cleaning the outer packaging cardboard box to be coated, removing dust, oil, and other impurities from the surface, then sanding the surface of the cardboard box to give it a certain roughness, which enhances the adhesion between the ink and the surface of the cardboard box. Finally, the pretreated cardboard box is placed on a fixed fixture to ensure that the cardboard box is fixed in position during the coating process.

3. The multi-color overlapping coating process for outer packaging paper boxes according to claim 1, characterized in that: The coating equipment debugging involves preparing a multi-color coating device, which includes multiple coating units, a drying unit, and a positioning unit arranged in sequence. Each coating unit corresponds to a single color of ink and includes an ink supply device, a coating nozzle, and a thickness adjustment mechanism. First, the positioning unit is debugged. The position of the cardboard box and the coating area are determined using a vision positioning system. Then, according to the designed pattern and color requirements, the position, angle, and coating thickness of the coating nozzle in each coating unit are adjusted. Simultaneously, the temperature and drying time of the drying unit are set.

4. The multi-color overlapping coating process for outer packaging paper boxes according to claim 1, characterized in that: The first color coating involves starting the coating equipment. The ink supply device of the first coating unit delivers ink of the corresponding color to the coating nozzle. The coating nozzle applies the first color to the surface of the cardboard box according to a preset path and thickness. After coating, the cardboard box enters the drying unit along with the conveying mechanism. The drying unit quickly dries the area coated with the first color ink. The drying temperature is controlled at 60-80℃, and the drying time is 10-20 seconds, so that the first color ink is initially cured.

5. The multi-color overlapping coating process for outer packaging paper boxes according to claim 1, characterized in that: The subsequent color overlay coating is performed after the first color coating and drying. The cardboard box is then conveyed to the next coating unit, where a second color is applied over the first color ink according to a preset pattern. During the coating process, the position of the cardboard box is monitored in real time by a positioning unit to ensure that the second color ink accurately overlaps the designated area of ​​the first color ink. After coating, the cardboard box re-enters the drying unit for drying, using the same drying parameters as the first color. This process is repeated sequentially for subsequent color overlay coating and drying. The coating thickness for each color is controlled between 5 and 10 μm, and the width of the overlapping area between adjacent colors is adjusted according to design requirements, typically between 1 and 3 mm.

6. The multi-color overlapping coating process for outer packaging paper boxes according to claim 1, characterized in that: The overall curing process involves transporting the cardboard box to the overall curing unit after all colors have been coated and dried. Ultraviolet (UV) curing is then used to cure the ink on the surface of the cardboard box. The UV wavelength is 365-405nm, and the curing time is 30-60 seconds, allowing the ink to fully cure and form a strong, wear-resistant coating.

7. The multi-color overlapping coating process for outer packaging paper boxes according to claim 1, characterized in that: The finished product inspection involves visually inspecting the outer packaging boxes that have undergone coating and curing processes. This includes checking indicators such as color overlap accuracy, color uniformity, coating adhesion, and abrasion resistance. Boxes that pass the inspection are considered finished products, while those that fail are reworked.

8. The multi-color overlapping coating process for outer packaging paper boxes according to claim 1, characterized in that: In step 1, when polishing the surface of the cardboard box, sandpaper is used with a grit of 200-400. After polishing, the surface roughness Ra of the cardboard box is 1.6-3.2μm.

9. The multi-color overlapping coating process for outer packaging paper boxes according to claim 1, characterized in that: In step 2, the coating nozzle is a piezoelectric inkjet nozzle with a nozzle diameter of 10-20μm, which can achieve high-precision ink jetting.

10. The multi-color overlapping coating process for outer packaging paper boxes according to claim 1, characterized in that: In steps 3 and 4, the drying unit uses a combination of hot air drying and infrared drying. The air velocity for hot air drying is 1-2 m / s, and the power for infrared drying is 500-1000W, which can dry the ink quickly and evenly.