Printing equipment for printing special texture effects and printing method thereof

Abstract

The present invention relates to a printing equipment for printing special texture effects and a printing method thereof, wherein the printing equipment includes a gravure printing device and a hot air drying device arranged thereafter, wherein a digital overclocking vibration spray printing device is further arranged between the gravure printing device and the hot air drying device, and the digital overclocking vibration spray printing device is provided with an ink tank, wherein the ink tank is filled with ink, and a vibrating vibration plate is mounted on the surface of the ink. The printing method is to apply the above-mentioned printing equipment to perform gravure printing, spray printing and drying, thereby printing a printed product with a special texture effect. The printing process of "gravure printing + spray printing" proposed in the present invention can print a special texture effect that is highly similar to the printing process of "gravure printing + screen printing", and can be used as an alternative process for screen printing special texture effects. It not only solves the problems existing in the prior art, but also can improve printing efficiency in many aspects, and is more suitable for large-scale supply needs.

Description

Technical Field

[0001] The invention belongs to the technical field of printing, and in particular relates to printing equipment for printing special texture effects and a printing method thereof. Background Art

[0002] At present, many high-end packaging need to be printed with special texture effects (such as Figure 4 To enhance the quality of packaging, a "gravure printing + screen printing" printing process is currently used. The special effects are achieved during the screen printing process, but screen printing presents some difficult-to-solve flaws. First, because the UV ink used in screen printing contains photoinitiators, incomplete curing often leaves a residual ink odor on the printed product, impacting the user experience of the finished packaging. To address this, the industry relies on testing for volatile organic compounds (VOCs) to limit the use of odorous photoinitiators. However, ink manufacturers often resort to constantly switching between different photoinitiators to circumvent VOCs testing. This results in finished packaging passing VOCs testing but still retaining an odor, effectively treating the symptoms rather than the root cause. Second, the stability of the special texture effects of screen-printed UV inks is affected by numerous external factors, such as UV curing power attenuation, voltage instability, uneven ink layer thickness, printer speed, and substrate surface flatness. These factors all affect the quality of screen UV printing. Third, screen printing machines are slow and inefficient, making it difficult to meet volume supply demands.

[0003] The current solution to the above problem is to use water-based gravure to carve special textures or to use flexographic printing or offset printing to simulate the special texture effects of screen printing. The inks used in these printing methods are different from UV inks. There is no photoinitiator in the inks, so the problem of residual odor of screen-printed packaging and the stability of the special texture effects of screen-printed UV inks being easily affected by external factors is avoided. At the same time, it can also improve printing efficiency. However, the special texture effects simulated by these printing methods (such as Figure 5 as shown) and the natural texture effect of screen UV blasting (as shown Figure 4 The difference between the two printing methods is not entirely consistent. Water-based gravure printing (flexographic printing, offset coating) creates gaps between printed textures, leaving the underlying textures empty and void. In contrast, UV-activated silk-screen printing creates textures on top of a full base of ink. These two printing methods consistently produce different results. Therefore, the present invention proposes a printing method that closely resembles the special texture effects of silk-screen printing to address existing issues. Summary of the Invention

[0004] In view of the above problems, the present invention provides a printing device and a printing method for printing special texture effects.

[0005] The specific technical solution is: a printing equipment for printing special texture effects, including a gravure printing device and a hot air drying device arranged behind it, a digital overfrequency vibration printing device is also arranged between the gravure printing device and the hot air drying device, the digital overfrequency vibration printing device is provided with an ink tank, the ink tank is filled with ink, and a vibrating plate is mounted on the surface of the ink.

[0006] Furthermore, an over-frequency vibration transducer is installed on the vibration plate, and the over-frequency vibration transducer can drive the vibration plate to vibrate at a high frequency.

[0007] Furthermore, a nozzle is provided at the bottom of the ink tank.

[0008] Furthermore, the vibration plate is made of stainless steel.

[0009] Furthermore, the gravure printing device includes an impression cylinder, a plate cylinder, an ink tank and a scraper. The plate cylinder is tightly attached to the bottom of the impression cylinder, and the lower part of the plate cylinder is immersed in the ink tank for carrying ink; the scraper is pressed on the surface of the plate cylinder for scraping off the ink on the plate surface where there is no image or text, so that the ink only remains in the ink mesh holes of the image and text; the impression cylinder and the plate cylinder rotate in opposite directions, and the two cooperate to complete the gravure printing of the printing paper, and send the printing paper to the bottom of the digital overfrequency vibration printing device for printing.

[0010] Furthermore, the ink in the ink tank is an atomized solvent.

[0011] Furthermore, the nozzle is capable of scattered printing.

[0012] The present invention also provides a method for printing using the printing equipment for printing special texture effects, comprising the following steps:

[0013] Step 1, gravure printing: First, the plate cylinder is started and its surface is covered with ink. At the same time, the scraper will scrape the ink off the areas without images on the plate surface, leaving only the ink in the inking holes of the images. Then the impression cylinder is started. When the printing paper passes between the impression cylinder and the plate cylinder, the ink remaining in the inking holes of the images on the plate cylinder is transferred to the printing paper under the pressure of the impression cylinder, thus obtaining a printed product.

[0014] Step 2, inkjet printing: When the printed matter obtained in step 1 is transported to the bottom of the digital overclocking vibration printing device, the overclocking vibration transducer is started. The overclocking vibration transducer will generate an AC voltage signal of a certain frequency and voltage, thereby driving the vibration plate to perform high-frequency vibration. When the vibration plate vibrates downward, the atomized solvent is pushed downward. When the vibration plate vibrates upward, the atomized solvent cannot keep up with the vibration speed of the vibration plate, and a gap is formed between the atomized solvent and the steel plate. Such repeated vibrations will generate many cavity bubbles, which propagate into the atomized solvent along the vibration direction. The cavity bubbles repeatedly collide in the ink tank to generate an impact force of thousands of atmospheres, driving the atomized solvent to be scattered and printed out, repeatedly hitting the printing ink layer of the printing paper, causing it to produce surface concave ripples, forming a printed matter with a special texture effect;

[0015] Step 3: Drying: The printed product obtained in step 2 is conveyed to a hot air drying device for ink drying to obtain a finished product with a special texture effect.

[0016] Beneficial effects of the present invention:

[0017] (1) The printing process of "gravure printing + inkjet printing" proposed in the present invention can print a special texture effect that is very similar to the printing process of "gravure printing + screen printing" (such as Figure 4 ), which can be used as an alternative process for screen printing special texture effects, effectively avoiding the problems of residual odor of screen-printed packaging, the stability of special texture effects of screen-printed UV ink being easily affected by external factors, and the slow speed and low production efficiency of screen printing machines that cannot meet large-scale supply needs. It solves the problem that existing water-based gravure engraving special textures, flexographic printing, and offset coating unit printing cannot fully simulate the special texture effects of screen printing.

[0018] (2) The present invention can improve printing efficiency in many aspects and is more suitable for large-scale supply needs. The specific performance is as follows: ① By adding a modified digital overclocked vibration inkjet printing device to the gravure printing production line, the present invention eliminates the process of transferring to the screen printing production line after gravure printing is completed, and realizes that a single gravure printing production line can print special texture effects; ② The inkjet printing device of the present invention not only prints special texture effects close to those of screen printing, but also has high printing efficiency; ③ The drying process of printed products produced by gravure printing and inkjet printing is simple, which can effectively shorten the drying time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of a printing device for printing special texture effects according to the present invention;

[0020] Figure 2 The static diagram (left) and the working state diagram (right) of the digital over-frequency vibration printing device of the present invention are shown;

[0021] Figure 3 The following is a static diagram (left) and a working state diagram (right) of an existing industrial digital printing device.

[0022] Figure 4 Special texture effect for existing screen printing;

[0023] Figure 5 Simulate special texture effects of screen printing for existing water-based gravure engraving, flexo printing, and offset coating units;

[0024] In the figure: 1-printing paper, 2-gravure printing device, 201-impression cylinder, 202-plate cylinder, 203-ink tank, 204-scraper, 3-digital overclocking vibration printing device, 301-waveform transmitter, 302-piezoelectric ceramic, 303-ink tank, 304-nozzle, 305-overclocking vibration transducer, 306-vibration plate, 4-hot air drying device, 5-ink. DETAILED DESCRIPTION

[0025] In order to make the technical problems and technical solutions solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Example 1

[0026] like Figure 1 、 Figure 2 As shown, this embodiment provides a printing device for printing special texture effects, comprising a gravure printing unit 2 and a hot air drying unit 4 disposed thereafter. This is a conventional device structure. To enable printing of special texture effects directly on a gravure printing production line, the present invention incorporates a digital overclocked vibration inkjet printing unit 3, specifically installed between the gravure printing unit 2 and the hot air drying unit 4. This allows the printing paper 1 to be processed using a combined "gravure printing + inkjet printing" process to produce a finished product with a special texture effect.

[0027] Among them, such as Figure 1 As shown, the gravure printing device 2 includes an impression cylinder 201, a plate cylinder 202, an ink tank 203 and a scraper 204. The plate cylinder 202 is tightly attached to the bottom of the impression cylinder 201, and the lower part of the plate cylinder 202 is immersed in the ink tank 203 for carrying the ink 5; the scraper 204 is pressed against the surface of the plate cylinder 202 for scraping the ink 5 on the plate surface without images, so that the ink 5 only remains in the inking cells of the images; the impression cylinder 201 and the plate cylinder 202 rotate in opposite directions, and the two cooperate to complete the gravure printing of the printing paper 1, and send the printing paper 1 to the bottom of the digital overclocking vibration printing device 3 for printing.

[0028] The digital over-frequency vibration printing device 3 is modified based on the existing industrial digital printing device. Figure 2 As shown, the digital overclocking vibration printing device 3 is provided with an ink tank 303, and the ink tank 303 is filled with ink 5, which is an atomized solvent. A vibrating plate 306 (made of stainless steel) is mounted on the surface of the ink 5, and an overclocking vibration device, such as an overclocking vibration transducer 305, is installed on the vibration plate 306. The overclocking vibration device can drive the vibration plate 306 to vibrate at high frequency. A nozzle 304 is provided at the bottom of the ink tank 303, and the nozzle 304 is for scattered printing, which is more conducive to printing special texture effects.

[0029] contrast Figure 2 and Figure 3 It can be seen that the digital overclocking vibration printing device 3 replaces the piezoelectric ceramic 302 and the waveform transmitter 301 in the existing industrial digital printing device with a vibration plate 306 and an overclocking vibration transducer 305 respectively, and replaces the ink used in the existing industrial digital printing device with an atomized solvent.

[0030] When existing industrial digital inkjet printing devices operate, waveform generator 301 emits a waveform that deforms and bends piezoelectric ceramic 302, thereby pushing ink out of nozzle 304 and onto the ink layer of substrate 1, completing the printing process. This printing effect merely creates a flat layer of ink covering the ink layer. However, the modified digital overclocked vibration inkjet printing device 3 operates by using an overclocked vibration transducer 305 to generate an AC voltage signal of a certain frequency and voltage, thereby driving a vibration plate 306 to vibrate at a high frequency. When vibration plate 306 vibrates downward, it pushes the atomized solvent downward. When vibration plate 306 vibrates upward, the atomized solvent cannot keep up with the vibration speed of vibration plate 306, creating a gap between the atomized solvent and vibration plate 306. This repeated vibration generates numerous bubbles, which are caused by the "cavity effect" and are known as cavity bubbles. The cavity bubbles propagate into the atomized solvent along the vibration direction, and the cavity bubbles repeatedly collide in the ink tank to generate an impact force of thousands of atmospheres, driving the atomized solvent to spray out in a scattered manner, and repeatedly hitting the printing ink layer of the printing paper 1, causing it to produce surface concave ripples, forming a printed product with a special texture effect, thereby achieving the purpose of simulating the special texture effect of screen printing. Example 2

[0031] like Figure 1 As shown, this example provides a method for printing using the above-mentioned printing equipment for printing special texture effects, including the following steps:

[0032] Step 1, gravure printing: First, the plate cylinder is started and its surface is covered with ink. At the same time, the scraper will scrape the ink off the areas without images on the plate surface, leaving only the ink in the inking holes of the images. Then the impression cylinder is started. When the printing paper passes between the impression cylinder and the plate cylinder, the ink remaining in the inking holes of the images on the plate cylinder is transferred to the printing paper under the pressure of the impression cylinder, thus obtaining a printed product.

[0033] Step 2, printing: When the printed matter obtained in step 1 is transported to the bottom of the digital overclocking vibration printing device, the overclocking vibration transducer is started. The overclocking vibration transducer will generate an AC voltage signal of a certain frequency and voltage, thereby driving the vibration plate to perform high-frequency vibration. When the vibration plate vibrates downward, the atomized solvent is pushed downward. When the vibration plate vibrates upward, the atomized solvent cannot keep up with the vibration speed of the vibration plate, and a gap is formed between the atomized solvent and the vibration plate. Such repeated vibrations will generate many cavity bubbles, which propagate into the atomized solvent along the vibration direction. The cavity bubbles repeatedly collide in the ink tank to generate an impact force of thousands of atmospheres, driving the atomized solvent to be scattered and printed out, repeatedly hitting the printing ink layer of the printing paper, causing it to produce surface concave ripples, forming a printed matter with a special texture effect;

[0034] Step 3: Drying: The printed product obtained in step 2 is conveyed to a hot air drying device for ink drying to obtain a finished product with a special texture effect.

[0035] The printing process of "gravure printing + inkjet printing" proposed in the present invention can print a special texture effect (such as Figure 4 ), which can be used as an alternative process for screen printing special texture effects, effectively avoiding the problems of residual odor of screen-printed packaging, the stability of special texture effects of screen-printed UV ink being easily affected by external factors, and the slow speed and low production efficiency of screen printing machines that cannot meet large-scale supply needs. It solves the problem that existing water-based gravure engraving special textures, flexographic printing, and offset coating unit printing cannot fully simulate the special texture effects of screen printing.

[0036] In addition, the present invention eliminates the process of transferring the screen printing production line after gravure printing by adding a modified digital overclocking vibration printing device to the gravure printing production line, thereby realizing that a single gravure printing production line can print special texture effects; and the special texture effect of inkjet printing is not only close to that of screen printing, but also has high printing efficiency; the drying process of printed products through gravure printing and inkjet printing is simple, which can effectively shorten the drying time. Overall, the present invention can improve printing efficiency in many aspects and is more suitable for large-scale supply needs.

[0037] The present invention is described in detail above through specific and preferred embodiments, but those skilled in the art should understand that the present invention is not limited to the embodiments described above. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A printing device for printing special texture effects, comprising a gravure printing device (2) and a hot air drying device (4) arranged thereafter, characterized in that: A digital over-frequency vibration printing device (3) is further provided between the gravure printing device (2) and the hot air drying device (4). The digital over-frequency vibration printing device (3) is provided with an ink tank (303). The ink tank (303) is filled with ink (5). A vibrating plate (306) is provided on the surface of the ink (5). An over-frequency vibration transducer (305) is installed on the vibration plate (306), and the over-frequency vibration transducer (305) can drive the vibration plate (306) to vibrate at a high frequency; the vibration plate (306) is made of stainless steel; a nozzle (304) is provided at the bottom of the ink tank (303); The gravure printing device (2) comprises an impression roller (201), a plate roller (202), an ink tank (203) and an ink scraper (204), wherein the plate roller (202) is closely attached to the bottom of the impression roller (201), and the bottom of the plate roller (202) is immersed in the ink tank (203) for carrying ink (5); the ink scraper (204) is pressed against the surface of the plate roller (202) for scraping off the ink (5) on the plate surface without images and texts, so that the ink (5) is only retained in the ink cells of the images and texts; the impression roller (201) and the plate roller (202) rotate in opposite directions, and the two cooperate to complete the gravure printing of the printing paper (1), and send the printing paper (1) to the bottom of the digital over-frequency vibration printing device (3) for printing.

2. The printing equipment for printing special texture effects according to claim 1, characterized in that: The ink (5) in the ink tank (303) is an atomized solvent.

3. The printing equipment for printing special texture effects according to claim 1, characterized in that: The nozzle (304) performs scattered printing.

4. A method for printing using a printing device for printing special texture effects as described in any one of claims 1 to 3, characterized in that: The steps include: Step 1, gravure printing: First, the plate cylinder is started and its surface is covered with ink. At the same time, the scraper will scrape the ink off the areas without images on the plate surface, leaving only the ink in the inking holes of the images. Then the impression cylinder is started. When the printing paper passes between the impression cylinder and the plate cylinder, the ink remaining in the inking holes of the images on the plate cylinder is transferred to the printing paper under the pressure of the impression cylinder, thus obtaining a printed product. Step 2, inkjet printing: When the printed matter obtained in step 1 is transported to the bottom of the digital overclocking vibration printing device, the overclocking vibration transducer is started. The overclocking vibration transducer will generate an AC voltage signal of a certain frequency and voltage, thereby driving the vibration plate to perform high-frequency vibration. When the vibration plate vibrates downward, the atomized solvent is pushed downward. When the vibration plate vibrates upward, the atomized solvent cannot keep up with the vibration speed of the vibration plate, and a gap is formed between the atomized solvent and the steel plate. Such repeated vibrations will generate many cavity bubbles, which propagate into the atomized solvent along the vibration direction. The cavity bubbles repeatedly collide in the ink tank to generate an impact force of thousands of atmospheres, driving the atomized solvent to be scattered and printed out, repeatedly hitting the printing ink layer of the printing paper, causing it to produce surface concave ripples, forming a printed matter with a special texture effect; Step 3: Drying: The printed product obtained in step 2 is conveyed to a hot air drying device for ink drying to obtain a finished product with a special texture effect.

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