A superimposed transfer printing unit and printing process method suitable for digital ink

Abstract

The present invention discloses a stacking transfer unit and printing process method suitable for digital ink, comprising a first unwinding mechanism for outputting a transfer film, a second unwinding mechanism for outputting a printing substrate, a first winding mechanism for winding up the transfer film, and a second winding mechanism for winding up the printing substrate. A digital printing mechanism and an overprinting mechanism are arranged between the first unwinding mechanism and the first winding mechanism. An LED UV lamp is fixedly arranged at the rear output end of the digital printing mechanism, and a mercury lamp is arranged at the overprinting mechanism. The present invention can effectively realize that a single digital ink can be fully adapted to various different printing substrates, effectively reducing the hardware cost of the equipment. The overprinting mechanism transfers the printed pattern at the transfer film to the printing substrate, effectively solving the problem of light and shadow defects existing in the prior art, and the printed product has the advantages of low ink migration and low odor.

Description

Technical Field

[0001] The present invention relates to the technical field of digital ink printing, and in particular to a superimposed transfer printing unit and a printing process method suitable for digital ink. Background Art

[0002] Digital ink jet printing technology is a non-contact printing technology based on digital files. It forms patterns or texts by spraying ink in the form of tiny droplets onto the printing substrate. Compared with traditional printing technology, digital ink jet printing technology has the advantages of high flexibility and customization, and can achieve fine patterns and color performance. Although digital ink jet printing technology can be applied to a variety of printing substrates, including paper, textiles, plastics, etc., due to the large differences in surface properties (such as smoothness, roughness, porosity, etc.) of printing substrates of different materials, different digital inks need to be adapted according to different printing substrates, which has created a great obstacle to the promotion of digital printing technology.

[0003] In actual operation, different printing substrates are adapted to different digital inks, which not only affects the compatibility and operational stability of digital printing equipment, but may also cause varying degrees of wear or blockage in the printheads due to differences in the chemical composition and particle size of different digital inks, and require more frequent cleaning and maintenance of the printheads.

[0004] In addition, when printing, different colors of ink layers will stack up during the printing process, causing the local ink layer to be too thick or too thin. Uneven ink layer thickness will directly affect the reflection and refraction of light, resulting in light and shadow defects. Areas with thicker ink layers may reflect excessively due to high gloss, while areas with thinner ink layers may reflect less due to low gloss, resulting in different reflected light and shadows and silhouettes when the overall color is observed at different angles. The observation results are quite different from those of traditional printed products. After printing, the surface of the printed product needs to be coated to improve the light and shadow presentation effect of the printed pattern and enhance the overall quality and aesthetics of the printed product.

[0005] Therefore, we proposed a superimposed transfer printing unit and printing process method suitable for digital ink. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a stacking transfer unit and a printing process method suitable for digital ink.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a stacking transfer unit suitable for digital ink, comprising a first unwinding mechanism for outputting a transfer film, a second unwinding mechanism for outputting a printing substrate, a first winding mechanism for winding up the transfer film, and a second winding mechanism for winding up the printing substrate, an overprinting mechanism is provided between the first unwinding mechanism and the first winding mechanism, a digital printing mechanism for printing digital ink on the transfer film output by the first unwinding mechanism is provided between the first unwinding mechanism and the overprinting mechanism, an LED UV lamp is fixedly provided at the rear output end of the digital printing mechanism, and the LED UV lamp is used to perform the first curing of the digital ink printed on the transfer film and make it in a highly viscous state;

[0008] The overprinting mechanism includes a first embossing roller, a second embossing roller, and an output roller. The second embossing roller is arranged between the first embossing roller and the output roller. The transfer film and the printing substrate are stacked between the first embossing roller and the second embossing roller. The digital ink in a highly viscous state on the transfer film is transferred to the printing substrate. A mercury lamp is provided at the overprinting mechanism, and the mercury lamp is used to completely cure the digital ink on the printing substrate.

[0009] It is further explained that the output roller is provided with a separation mechanism for separating the overlapped transfer film from the printing substrate, and the separation mechanism includes a first roller frame and a second roller frame, one end of the first roller frame is provided with a first supporting roller for supporting the printing substrate, the other end of the first roller frame is connected to the deflection shaft, the deflection shaft is connected with a tension arm and a first gear, one end of the second roller frame is provided with a second supporting roller for supporting the transfer film, and the other end of the second roller frame is provided with a second gear meshing with the first gear.

[0010] It is further explained that a pulling rod is connected to the pulling arm, one end of the pulling rod is hinged to the pulling arm, the other end of the pulling rod is slidably passed through the cylinder part, the end of the cylinder part is hinged to the fixed axis, a compression spring is provided in the cylinder part, the other end of the pulling rod is passed through the compression spring, and a baffle part that contacts the compression spring is provided.

[0011] It is further explained that the digital printing mechanism includes a digital printing nozzle and a film unfolding bracket. The digital printing nozzle is arranged on the upper side of the film unfolding bracket. The two sides of the film unfolding bracket are respectively provided with a left film guide roller and a right film guide roller. The left film guide roller and the right film guide roller are located at the same horizontal height. After the transfer film is printed by the digital printing nozzle, it is transported from the right film guide roller to the overprinting mechanism.

[0012] It is further explained that a first film roll changing position is reserved between the first unwinding mechanism and the second unwinding mechanism, and a plurality of first conveying roller groups are arranged above the first unwinding mechanism. The printing substrate that has not completed transfer output by the second unwinding mechanism is conveyed by the first conveying roller group, crosses the first film roll changing position and the first unwinding mechanism, and is conveyed to the overprinting mechanism.

[0013] It is further explained that a second film roll changing position is reserved between the second winding mechanism and the first winding mechanism, and a plurality of second conveying roller groups are arranged above the first winding mechanism. The printing substrate that has completed transfer output by the overprinting mechanism is conveyed by the second conveying roller group, crosses the first winding mechanism and the second film roll changing position, and is conveyed to the second winding mechanism.

[0014] It is further explained that the first unwinding mechanism includes an unwinding wheel group and an unwinding motor. The unwinding wheel group is provided with a driving gear that meshes with the shaft end gear of the air shaft of the transfer film roll. The unwinding motor and the unwinding wheel group are driven by a synchronous belt. The second unwinding mechanism has the same structure as the first unwinding mechanism.

[0015] A printing process method, based on the above-mentioned overlapping transfer unit, includes the following steps:

[0016] S1, the first unwinding mechanism outputs the transfer film to the digital printing mechanism, and the digital printing mechanism sprays digital ink on the transfer film to print a pattern on the surface of the transfer film;

[0017] The second unwinding mechanism conveys the printing substrate to the overprinting mechanism;

[0018] S2, after the transfer film is printed, it is transported to the overprinting mechanism and passes through the LED UV lamp during the transportation process. The LED UV lamp performs the first curing of the digital ink printed on the transfer film and makes it highly viscous;

[0019] S3, the overprinting mechanism overlays the transfer film and the printing substrate, so that the digital ink on the transfer film is transferred to the printing substrate, and then the printed pattern on the transfer film is transferred to the printing substrate;

[0020] S4, the mercury lamp at the overprinting mechanism performs light curing on the digital ink at the printing substrate, so that the highly viscous digital ink at the printing substrate is completely cured;

[0021] S5. The overprinting mechanism outputs the transfer film and the printing substrate, the first winding mechanism winds up the transfer film, and the second winding mechanism winds up the printing substrate.

[0022] The beneficial effects of the present invention are:

[0023] 1. Compared with the prior art which requires different digital inks to be adapted to different printing substrates, the present invention prints digital ink on a transfer film and then transfers the transfer film to the printing substrate, which can effectively achieve that a single digital ink can be fully adapted to various printing substrates, and there is no need to match different digital inks for different printing materials. Users can also digitally print on various printing materials more conveniently;

[0024] Second, compared with the existing inkjet printing technology, which is prone to light and shadow defects due to excessive thickness or thinness of the local ink layer during printing, the overprinting mechanism of the present invention transfers the printed pattern on the transfer film to the printing substrate, and the ink thickness of the pattern after transfer is consistent, which effectively solves the problem of light and shadow defects in the prior art;

[0025] 3. After the printing is completed, the prior art is completely exposed to the air for curing during the UV curing process. Since the oxygen in the air will hinder the UV curing process, it often causes incomplete curing, and some active small molecules still exist in the printed product, which inevitably causes problems such as strong odor and easy migration. However, the present invention uses a mercury lamp to cure after the transfer film and the substrate are pressed together. During the pressing process, the air between the two materials is squeezed out, so there is almost no oxygen involved in the curing process, reducing the obstruction of oxygen in the curing process. Therefore, on the one hand, the photoinitiator required for digital ink can be reduced, and on the other hand, it is conducive to improving the curing efficiency, so that the highly viscous digital ink at the substrate is completely cured, and the residue of small molecule active substances such as photoinitiators is greatly reduced, so that the printed product has the advantages of low migration and low odor, which can be applied to the food packaging printing industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 It is a structural schematic diagram of the present invention.

[0028] Figure 3 It is a structural diagram of the separation mechanism.

[0029] Figure 4 It is a structural schematic diagram of the overprinting mechanism.

[0030] Figure 5 It is a structural schematic diagram of the first unwinding mechanism.

[0031] Figure Number:

[0032] 10. First unwinding mechanism; 10A. Transfer film; 101. First film roll changing position; 102. First conveying roller group; 103. Inflatable shaft; 104. Shaft end gear; 105. Transfer film roll; 11. Unwinding wheel group; 111. Driving gear; 12. Unwinding motor;

[0033] 20, second unwinding mechanism; 20A, printing substrate; 30, first winding mechanism; 301, second film roll changing position; 302, second conveying roller group; 40, second winding mechanism; 50, overprinting mechanism; 51, first embossing roller; 52, second embossing roller; 53, output roller;

[0034] 60. Digital printing mechanism; 61. Digital printing nozzle; 62. Film spreading bracket; 621. Left film guide roller; 622. Right film guide roller; 70. LED UV lamp; 80. Mercury lamp;

[0035] 90. Separation mechanism; 91. First roller frame; 92. Second roller frame; 921. Second gear; 93. First support roller; 94. Second support roller; 95. Deflection shaft; 951. First gear; 96. Pull arm; 97. Pull rod member; 981. Fixed shaft; 98. Cylinder member; 971. Baffle member; 99. Compression spring. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] Specific embodiment 1: Combined with the attached Figure 1 and attached Figure 2 As shown, a stacking transfer unit suitable for digital ink includes a first unwinding mechanism 10 for outputting a transfer film 10A, a second unwinding mechanism 20 for outputting a printing substrate 20A, a first winding mechanism 30 for winding up the transfer film 10A, and a second winding mechanism 40 for winding up the printing substrate 20A. The first winding mechanism 30 and the second winding mechanism 40 are responsible for providing the transfer film 10A and the printing substrate 20A, respectively, to ensure the continuity and stability of the entire transfer process. The first winding mechanism 30 corresponds to the first unwinding mechanism 10, and the second winding mechanism 40 corresponds to the second unwinding mechanism 20.

[0038] An overprinting mechanism 50 is provided between the first unwinding mechanism 10 and the first winding mechanism 30. A digital printing mechanism 60 for printing digital ink on the transfer film output by the first unwinding mechanism 10 is provided between the first unwinding mechanism 10 and the overprinting mechanism 50. An LED UV lamp 70 is fixedly provided at the rear output end of the digital printing mechanism 60. The LED UV lamp 70 is used to perform the first curing of the digital ink printed on the transfer film 10A and make it highly viscous.

[0039] The overprinting mechanism 50 includes a first embossing roller 51, a second embossing roller 52, and an output roller 53. The second embossing roller 52 is arranged between the first embossing roller 51 and the output roller 53. The transfer film 10A and the printing substrate 20A are stacked between the first embossing roller 51 and the second embossing roller 52. The highly viscous digital ink at the transfer film 10A is transferred to the printing substrate 20A. A mercury lamp 80 is provided at the overprinting mechanism 50. The mercury lamp 80 is used to completely cure the digital ink at the printing substrate 20A.

[0040] The formula of the digital ink sprayed by the digital printing mechanism 60 includes the following raw materials in weight percentage: 30-40% monomer A, 30-40% monomer B, 1-5% long-wave initiator, 5-15% short-wave initiator, 3-8% auxiliary agent, 5-15% resin, and 15-20% pigment. The digital ink can form a colloid of corresponding viscosity under long-wave UV curing according to the adjustment of the formula ratio, and then be fully cured by short-wave UV curing. By properly adjusting the components of the long-wave photoinitiator and the short-wave photoinitiator in the formula, the viscosity after the first UV curing can be easily adjusted, and the process stability is stronger. The LEDUV lamp 70 plays the role of short-wave light curing, and the mercury lamp 80 plays the role of long-wave light curing.

[0041] Compared with the prior art which requires adapting different digital inks according to different printing substrates, the present invention prints digital ink on the transfer film 10A, and then transfers the transfer film 10A to the printing substrate, thereby effectively realizing that a single digital ink can be fully adapted to various different printing substrates. There is no need to configure different nozzles for different digital inks, thereby effectively reducing the equipment hardware cost of digital printing.

[0042] Since the present invention first prints digital ink on the transfer film 10A, and then transfers the transfer film 10A to the printing substrate, the overprinting mechanism 50 then overlays the transfer film 10A and the printing substrate 20A, so that the digital ink on the transfer film 10A is transferred to the printing substrate 20A, and then the printed pattern on the transfer film 10A is transferred to the printing substrate 20A, and then the mercury lamp 80 performs light curing on the digital ink on the printing substrate 20A, so that the highly viscous digital ink on the printing substrate 20A is completely cured. Compared with the existing printing technology, which is prone to light and shadow defects due to excessive thickness or thinness of the local printing ink layer during printing, the overprinting mechanism 50 of the present invention transfers the printed pattern on the transfer film 10A to the printing substrate 20A, and the ink thickness of the pattern after transfer is consistent, which effectively solves the problem of light and shadow defects in the prior art.

[0043] In addition, after the prior art is completed, the ink on the printed product is easily oxidized by the air, and has defects such as easy volatility, high migration, and strong odor. The present invention uses a mercury lamp 80 to light-cure the digital ink at the printing substrate 20A, so that the highly viscous digital ink at the printing substrate 20A is completely cured. The ink after complete light curing does not have the problem of being oxidized by the air, so that the printed product has the advantages of low ink migration and low odor, and can be applied to the food packaging printing industry.

[0044] Specific embodiment 2: Combined with the attached Figure 1 and attached Figure 2 As shown, a stacking transfer unit suitable for digital ink includes a first unwinding mechanism 10 for outputting a transfer film 10A, a second unwinding mechanism 20 for outputting a printing substrate 20A, a first winding mechanism 30 for winding up the transfer film 10A, and a second winding mechanism 40 for winding up the printing substrate 20A. The first winding mechanism 30 and the second winding mechanism 40 are responsible for providing the transfer film 10A and the printing substrate 20A, respectively, to ensure the continuity and stability of the entire transfer process. The first winding mechanism 30 corresponds to the first unwinding mechanism 10, and the second winding mechanism 40 corresponds to the second unwinding mechanism 20.

[0045] An overprinting mechanism 50 is provided between the first unwinding mechanism 10 and the first winding mechanism 30. A digital printing mechanism 60 for printing digital ink on the transfer film output by the first unwinding mechanism 10 is provided between the first unwinding mechanism 10 and the overprinting mechanism 50. An LED UV lamp 70 is fixedly provided at the rear output end of the digital printing mechanism 60. The LED UV lamp 70 is used to perform the first curing of the digital ink printed on the transfer film 10A and make it highly viscous.

[0046] The overprinting mechanism 50 includes a first embossing roller 51, a second embossing roller 52, and an output roller 53. The second embossing roller 52 is arranged between the first embossing roller 51 and the output roller 53. The transfer film 10A and the printing substrate 20A are stacked between the first embossing roller 51 and the second embossing roller 52. The highly viscous digital ink at the transfer film 10A is transferred to the printing substrate 20A. A mercury lamp 80 is provided at the overprinting mechanism 50. The mercury lamp 80 is used to completely cure the digital ink at the printing substrate 20A.

[0047] The formula of the digital ink sprayed by the digital printing mechanism 60 includes the following raw materials in weight percentage: 30-40% monomer A, 30-40% monomer B, 1-5% long-wave initiator, 5-15% short-wave initiator, 3-8% auxiliary agent, 5-15% resin, and 15-20% pigment. The digital ink can form a colloid of corresponding viscosity under long-wave UV curing according to the adjustment of the formula ratio, and then be fully cured by short-wave UV curing. By properly adjusting the components of the long-wave photoinitiator and the short-wave photoinitiator in the formula, the viscosity after the first UV curing can be easily adjusted, and the process stability is stronger. The LEDUV lamp 70 plays the role of short-wave light curing, and the mercury lamp 80 plays the role of long-wave light curing.

[0048] A printing process method, based on the above-mentioned overlapping transfer unit, includes the following steps:

[0049] S1, the first unwinding mechanism 10 outputs the transfer film 10A to the digital printing mechanism 60, and the digital printing mechanism 60 sprays digital ink on the transfer film 10A to print a pattern on the surface of the transfer film 10A;

[0050] The second unwinding mechanism 20 delivers the printing substrate 20A to the overprinting mechanism 50;

[0051] S2, after the transfer film is printed, it is transported to the overprinting mechanism 50, and during the transportation, it passes through the LED UV lamp 70, which performs the first curing of the digital ink printed on the transfer film 10A and makes it highly viscous;

[0052] S3, the overprinting mechanism 50 overlays the transfer film 10A and the printing substrate 20A, so that the digital ink on the transfer film 10A is transferred to the printing substrate 20A, and then the printed pattern on the transfer film 10A is transferred to the printing substrate 20A;

[0053] S4, the mercury lamp 80 at the overprinting mechanism 50 performs light curing on the digital ink at the printing substrate 20A, so that the highly viscous digital ink at the printing substrate 20A is completely cured;

[0054] S5, the overprinting mechanism 50 outputs the transfer film 10A and the printing substrate 20A, the first winding mechanism 30 winds up the transfer film 10A, and the second winding mechanism 40 winds up the printing substrate 20A. Since the overprinting mechanism 50 has completely transferred the printed pattern on the transfer film 10A to the printing substrate 20A, after the first winding mechanism 30 completes winding up the transfer film 10A, the transfer film 10A can be reused later to achieve recycling.

[0055] Specific embodiment three: Combined with the attached Figure 1 and attached Figure 2As shown, a stacking transfer unit suitable for digital ink includes a first unwinding mechanism 10 for outputting a transfer film 10A, a second unwinding mechanism 20 for outputting a printing substrate 20A, a first winding mechanism 30 for winding up the transfer film 10A, and a second winding mechanism 40 for winding up the printing substrate 20A. The first winding mechanism 30 and the second winding mechanism 40 are responsible for providing the transfer film 10A and the printing substrate 20A, respectively, to ensure the continuity and stability of the entire transfer process. The first winding mechanism 30 corresponds to the first unwinding mechanism 10, and the second winding mechanism 40 corresponds to the second unwinding mechanism 20.

[0056] An overprinting mechanism 50 is provided between the first unwinding mechanism 10 and the first winding mechanism 30. A digital printing mechanism 60 for printing digital ink on the transfer film output by the first unwinding mechanism 10 is provided between the first unwinding mechanism 10 and the overprinting mechanism 50. An LED UV lamp 70 is fixedly provided at the rear output end of the digital printing mechanism 60. The LED UV lamp 70 is used to perform the first curing of the digital ink printed on the transfer film 10A and make it highly viscous.

[0057] The overprinting mechanism 50 includes a first embossing roller 51, a second embossing roller 52, and an output roller 53. The second embossing roller 52 is arranged between the first embossing roller 51 and the output roller 53. The transfer film 10A and the printing substrate 20A are stacked between the first embossing roller 51 and the second embossing roller 52. The highly viscous digital ink at the transfer film 10A is transferred to the printing substrate 20A. A mercury lamp 80 is provided at the overprinting mechanism 50. The mercury lamp 80 is used to completely cure the digital ink at the printing substrate 20A.

[0058] The formula of the digital ink sprayed by the digital printing mechanism 60 includes the following raw materials in weight percentage: 30-40% monomer A, 30-40% monomer B, 1-5% long-wave initiator, 5-15% short-wave initiator, 3-8% auxiliary agent, 5-15% resin, and 15-20% pigment. The digital ink can form a colloid of corresponding viscosity under long-wave UV curing according to the adjustment of the formula ratio, and then be fully cured by short-wave UV curing. By properly adjusting the components of the long-wave photoinitiator and the short-wave photoinitiator in the formula, the viscosity after the first UV curing can be easily adjusted, and the process stability is stronger. The LEDUV lamp 70 plays the role of short-wave light curing, and the mercury lamp 80 plays the role of long-wave light curing.

[0059] Combined with Figure 1 and attached Figure 3As shown, a separation mechanism 90 for separating the stacked transfer film 10A from the printing substrate 20A is provided at the output roller 53, and the separation mechanism 90 includes a first roller frame 91 and a second roller frame 92. A first supporting roller 93 for supporting the printing substrate is provided at one end of the first roller frame 91, and the other end of the first roller frame 91 is connected to a deflection shaft 95. A tension arm 96 and a first gear 951 are connected to the deflection shaft 95. A second supporting roller 94 for supporting and pressing the transfer film is provided at one end of the second roller frame 92, and a second gear 921 meshing with the first gear 951 is provided at the other end of the second roller frame 92. The first gear 951 is specifically a fan gear, and the second gear 921 is specifically a circular gear.

[0060] A pull rod 97 is connected to the tension arm 96, one end of the pull rod 97 is hinged to the tension arm 96, and the other end of the pull rod 97 is slidably inserted into the cylinder 98. The end of the cylinder 98 is hinged to the fixed shaft 981. A compression spring 99 is arranged in the cylinder 98, and the other end of the pull rod 97 is inserted into the compression spring 99, and a baffle 971 is arranged to abut against the compression spring 99. The separation mechanism 90 can ensure that the transfer film 10A delivered by the output roller 53 and the printing substrate 20A are separated from each other after the superimposition is completed, and as the diameter of the film roll of the transfer film 10A rolled up by the first winding mechanism 30 increases, the angle between the transfer film 10A delivered by the output roller 53 and the printing substrate 20A gradually decreases, and the angle between the first roller frame 91 and the second roller frame 92 also decreases, thereby ensuring that the transfer film 10A and the printing substrate 20A always maintain a moderate surface tension state when winding.

[0061] Combined with Figure 1 As shown, the digital printing mechanism 60 includes a digital printing nozzle 61 and a film unfolding bracket 62. The digital printing nozzle 61 is arranged on the upper side of the film unfolding bracket 62. The two sides of the film unfolding bracket 62 are respectively provided with a left film guide roller 621 and a right film guide roller 622. The left film guide roller 621 and the right film guide roller 622 are located at the same horizontal height. The left film guide roller 621 and the right film guide roller 622 cooperate to flatten the transfer film 10A. The digital printing nozzle 61 prints a pattern on the flat surface of the transfer film 10A. After being printed by the digital printing nozzle 61, the transfer film 10A is transported from the right film guide roller 622 to the overprinting mechanism 50.

[0062] A first film roll changing position 101 is provided between the first unwinding mechanism 10 and the second unwinding mechanism 20. The first film roll changing position 101 can be conveniently provided to change the transfer film roll at the first unwinding mechanism 10. A plurality of first conveying roller groups 102 are arranged above the first unwinding mechanism 10. The untransferred printing substrate 20A outputted from the second unwinding mechanism 20 is conveyed by the first conveying roller groups 102, across the first film roll changing position 101 and the first unwinding mechanism 10, and is conveyed to the overprinting mechanism 50.

[0063] A second film roll changing position 301 is provided between the second winding mechanism 40 and the first winding mechanism 30. The second film roll changing position 301 can be conveniently provided to remove the rolled transfer film roll from the first winding mechanism 30. A plurality of second conveying roller groups 302 are arranged above the first winding mechanism 30. The printing substrate 20A output by the overprinting mechanism 50 after the transfer is completed is transmitted through the second conveying roller group 302, across the first winding mechanism 30 and the second film roll changing position 301, and is transported to the second winding mechanism 40. The first winding mechanism 30 and the second winding mechanism 40 both adopt conventional winding technology, and the specific details will not be repeated.

[0064] The first unwinding mechanism 10 includes an unwinding wheel group 11 and an unwinding motor 12. The unwinding wheel group 11 is provided with a driving gear 111 that meshes with the shaft end gear 104 of the air shaft 103 of the transfer film roll 105. The unwinding motor 12 and the unwinding wheel group 11 are driven by a synchronous belt. The second unwinding mechanism 20 has the same structure as the first unwinding mechanism 10.

[0065] The printing process of the above-mentioned superposition transfer unit includes the following steps:

[0066] S1, the first unwinding mechanism 10 outputs the transfer film 10A to the digital printing mechanism 60, and the digital printing mechanism 60 sprays digital ink on the transfer film 10A to print a pattern on the surface of the transfer film 10A;

[0067] The second unwinding mechanism 20 delivers the printing substrate 20A to the overprinting mechanism 50;

[0068] S2, after the transfer film is printed, it is transported to the overprinting mechanism 50, and during the transportation, it passes through the LED UV lamp 70, which performs the first curing of the digital ink printed on the transfer film 10A and makes it highly viscous;

[0069] S3, the overprinting mechanism 50 overlays the transfer film 10A and the printing substrate 20A, so that the digital ink on the transfer film 10A is transferred to the printing substrate 20A, and then the printed pattern on the transfer film 10A is transferred to the printing substrate 20A;

[0070] S4, the mercury lamp 80 at the overprinting mechanism 50 performs light curing on the digital ink at the printing substrate 20A, so that the highly viscous digital ink at the printing substrate 20A is completely cured;

[0071] S5, the overprinting mechanism 50 outputs the transfer film 10A and the printing substrate 20A, the first winding mechanism 30 winds up the transfer film 10A, and the second winding mechanism 40 winds up the printing substrate 20A. Since the overprinting mechanism 50 has completely transferred the printed pattern on the transfer film 10A to the printing substrate 20A, after the first winding mechanism 30 completes winding up the transfer film 10A, the transfer film 10A can be reused later to achieve recycling.

[0072] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0073] It should be understood that the present invention uses the terms "first", "second", etc. to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0074] The above description does not limit the technical scope of the present invention in any way. Any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A superimposed transfer printing unit suitable for digital ink, characterized in that: The invention comprises a first unwinding mechanism (10) for outputting a transfer film (10A), a second unwinding mechanism (20) for outputting a printing substrate (20A), a first rewinding mechanism (30) for rewinding the transfer film (10A), and a second rewinding mechanism (40) for rewinding the printing substrate (20A); an overprinting mechanism (50) is provided between the first unwinding mechanism (10) and the first rewinding mechanism (30); a digital printing mechanism (60) for printing digital ink on the transfer film (10A) outputted by the first unwinding mechanism (10) is provided between the first unwinding mechanism (10) and the overprinting mechanism (50); an LED UV lamp (70) is fixedly provided at the rear output end of the digital printing mechanism (60); the LED UV lamp (70) is used to perform a first curing on the digital ink printed on the transfer film (10A) and make it in a highly viscous state; The overprinting mechanism (50) comprises a first embossing roller (51), a second embossing roller (52), and an output roller (53); the second embossing roller (52) is arranged between the first embossing roller (51) and the output roller (53); the transfer film (10A) and the printing substrate (20A) are folded between the first embossing roller (51) and the second embossing roller (52); the digital ink in a highly viscous state on the transfer film (10A) is transferred to the printing substrate (20A); a mercury lamp (80) is arranged at the overprinting mechanism (50); the mercury lamp (80) is used to completely cure the digital ink on the printing substrate (20A); The output roller (53) is provided with a separation mechanism (90) for separating the superimposed transfer film (10A) from the printing substrate (20A), the separation mechanism (90) comprising a first roller frame (91) and a second roller frame (92), one end of the first roller frame (91) is provided with a first supporting roller (93) for supporting the printing substrate (20A), the other end of the first roller frame (91) is connected to a deflection shaft (95), the deflection shaft (95) is connected with a tension arm (96) and a first gear (951), one end of the second roller frame (92) is provided with a second supporting roller (94) for supporting the transfer film (10A), and the other end of the second roller frame (92) is provided with a second gear (921) meshing with the first gear (951); The pulling arm (96) is connected to a pulling rod (97), one end of the pulling rod (97) is hinged to the pulling arm (96), the other end of the pulling rod (97) is slidably inserted into a cylinder (98), the end of the cylinder (98) is hinged to a fixed shaft (981), a compression spring (99) is provided in the cylinder (98), the other end of the pulling rod (97) is inserted into the compression spring (99), and a baffle portion (971) is provided that contacts the compression spring (99).

2. The overlay transfer unit suitable for digital ink according to claim 1, characterized in that: The digital printing mechanism (60) comprises a digital printing nozzle (61) and a film spreading bracket (62); the digital printing nozzle (61) is arranged on the upper side of the film spreading bracket (62); a left film guide roller (621) and a right film guide roller (622) are respectively arranged on both sides of the film spreading bracket (62); the left film guide roller (621) and the right film guide roller (622) are located at the same horizontal height; after being printed by the digital printing nozzle (61), the transfer film (10A) is transported from the right film guide roller (622) to the overprinting mechanism (50).

3. The overlay transfer unit suitable for digital ink according to claim 1, characterized in that: A first film roll changing position (101) is provided between the first unwinding mechanism (10) and the second unwinding mechanism (20), and a plurality of first conveying roller groups (102) are arranged above the first unwinding mechanism (10). The untransferred printing substrate (20A) output by the second unwinding mechanism (20) is conveyed by the first conveying roller group (102), passes through the first film roll changing position (101) and the first unwinding mechanism (10), and is conveyed to the overprinting mechanism (50).

4. The overlay transfer printing unit suitable for digital ink according to claim 3, characterized in that: A second film roll changing position (301) is provided between the second winding mechanism (40) and the first winding mechanism (30), and a plurality of second conveying roller groups (302) are arranged above the first winding mechanism (30). The printing substrate (20A) that has completed transfer and output by the overprinting mechanism (50) is transported via the second conveying roller group (302), passes through the first winding mechanism (30) and the second film roll changing position (301), and is transported to the second winding mechanism (40).

5. The overlay transfer unit suitable for digital ink according to claim 1, characterized in that: The first unwinding mechanism (10) comprises an unwinding wheel group (11) and an unwinding motor (12); the unwinding wheel group (11) is provided with a driving gear (111) meshing with a shaft end gear (104) of an air shaft (103) of a transfer film roll (105); the unwinding motor (12) and the unwinding wheel group (11) are driven by a synchronous belt; the second unwinding mechanism (20) has the same structure as the first unwinding mechanism (10).

6. A printing process, characterized in that: The stacking transfer unit according to claim 1 comprises the following steps: S1, the first unwinding mechanism (10) outputs the transfer film (10A) to the digital printing mechanism (60), and the digital printing mechanism (60) sprays digital ink on the transfer film (10A) to print a pattern on the surface of the transfer film (10A); The second unwinding mechanism (20) transports the printing substrate (20A) to the overprinting mechanism (50); S2, after the transfer film has been printed with a pattern, it is transported to the overprinting mechanism (50), and during the transport process, it passes through the LED UV lamp (70), and the LED UV lamp (70) performs a first curing on the digital ink printed on the transfer film (10A) to make it highly viscous; S3, the overprinting mechanism (50) overlays the transfer film (10A) and the printing substrate (20A), so that the digital ink on the transfer film (10A) is transferred to the printing substrate (20A), and the printed pattern on the transfer film (10A) is transferred to the printing substrate (20A); S4, the mercury lamp (80) at the overprinting mechanism (50) performs light curing on the digital ink at the printing substrate (20A), so that the highly viscous digital ink at the printing substrate (20A) is completely cured; S5. The overprinting mechanism (50) outputs the transfer film (10A) and the printing substrate (20A), the first winding mechanism (30) winds up the transfer film (10A), and the second winding mechanism (40) winds up the printing substrate (20A).

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