Digital printing method

Abstract

The invention relates to the technical field of digital printing, and discloses a digital printing method, a printing stock is a transparent material and is printed on the reverse side of the printing stock, and the printing method comprises the following steps that gloss oil is printed on the printing stock in a jet printing mode, powder spraying is conducted, and curing is conducted at the same time; the ink spraying system sprays color ink to a printing stock for printing, and a corresponding mirror image color pattern is sprayed and printed; and white ink is jet-printed on the printing stock. According to the digital printing method, printing is carried out on the back face of the transparent printing stock, the pattern can be protected, it is guaranteed that the product always has a good visual effect, the effect that the front face is watched through back face printing and the effect that the front face and the back face are watched through back face printing can be achieved, the perception effect of the pattern is not affected, and the printing effect is good. And a better perception effect can be obtained.

Description

Technical Field

[0001] The present application relates to the technical field of digital printing, and in particular to a digital printing method. Background Art

[0002] Digital printing machines are widely used in daily life. The existing digital printing processes mainly include spray printing, transfer printing and powder spraying. However, in the existing printing methods, the front side (i.e., the viewing side) of the printed substrate is always in contact and friction during use because the front side is directly exposed to the outside. After a period of use, the printed pattern will partially or completely fade or disappear, affecting the beauty of the pattern and directly affecting the use of the product.

[0003] On the other hand, the back of the substrate is generally not exposed. For example, the back of a mobile phone case is directly in contact with the surface of the mobile phone, and the above situation will not occur. Therefore, if the pattern is printed on the back of the substrate, it can effectively protect the pattern and avoid damage to the pattern, ensuring that the product always has a good visual effect. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a digital printing method, which prints the pattern on the back of the substrate without affecting the appearance of the pattern, thereby protecting the pattern and ensuring that the product always has a good visual effect.

[0005] The technical solution adopted by this application to solve its technical problem is:

[0006] A digital printing method, wherein the substrate is a transparent material and printing is performed on the reverse side of the substrate, and the printing method comprises the following steps:

[0007] Print varnish on the substrate, spray powder, and cure at the same time;

[0008] The inkjet system sprays colored ink onto the substrate for printing, printing out the corresponding mirror-image colored pattern;

[0009] Print white ink on the substrate.

[0010] Preferably, before printing white ink on the substrate, the method further comprises the following steps:

[0011] Print transfer varnish on the area where the substrate needs to be transferred, and print hot-blocking varnish on the area where transfer is not required, and then cure;

[0012] Transfer the printing material.

[0013] Preferably, after printing the white ink, the following steps are also included:

[0014] The inkjet system sprays colored ink onto the substrate for printing, printing the corresponding positive color pattern;

[0015] The substrate is sprayed with varnish, powdered and cured at the same time.

[0016] A digital printing method, wherein the substrate is a transparent material and printing is performed on the reverse side of the substrate, and the printing method comprises the following steps:

[0017] The inkjet system sprays colored ink onto the substrate for printing, printing out the corresponding mirror-image colored pattern;

[0018] Print varnish on the substrate, spray powder, and cure at the same time;

[0019] Print white ink on the substrate.

[0020] Preferably, before printing white ink on the substrate, the method further comprises the following steps:

[0021] Print the hot-repellent varnish on the area of ​​the substrate that does not need to be transferred and cure it;

[0022] Transfer the printing material.

[0023] Preferably, after printing the white ink, the following steps are also included:

[0024] Print varnish on the substrate, spray powder, and cure at the same time;

[0025] The inkjet system sprays colored ink onto the substrate for printing, printing the corresponding positive color pattern;

[0026] Print varnish on the substrate and perform UV curing.

[0027] A digital printing method, wherein the substrate is a transparent material and printing is performed on the reverse side of the substrate, and the printing method comprises the following steps:

[0028] Print varnish on the substrate, spray powder, and cure at the same time;

[0029] The inkjet system sprays colored ink onto the substrate for printing, printing out corresponding colored patterns;

[0030] The substrate is sprayed with varnish, powdered and cured at the same time.

[0031] A digital printing method, wherein the substrate is a transparent material and printing is performed on the reverse side of the substrate, and the printing method comprises the following steps:

[0032] The inkjet system sprays colored ink onto the substrate for printing, printing out the corresponding mirror-image colored pattern;

[0033] Print varnish on the substrate, spray powder, and cure at the same time;

[0034] The inkjet system sprays colored ink onto the substrate for printing, printing the corresponding positive color pattern;

[0035] Print varnish on the substrate and perform UV curing.

[0036] A digital printing method, wherein the substrate is a transparent material and printing is performed on the reverse side of the substrate, and the printing method comprises the following steps:

[0037] The inkjet system prints the pattern of the area to be transferred onto the transparent substrate in a mirror image;

[0038] Spray transfer varnish on the color pattern to be transferred;

[0039] Transfer the pattern part of the inkjet transfer varnish;

[0040] Print the part of the pattern that does not need to be transferred onto a transparent substrate;

[0041] The whole is printed with white ink.

[0042] A digital printing method, wherein the substrate is a transparent material and printing is performed on the reverse side of the substrate, and the printing method comprises the following steps:

[0043] Printing the entire color pattern with color ink on a transparent substrate;

[0044] Print varnish on the pattern area to be transferred and cure it;

[0045] Transfer the pattern part of the inkjet transfer varnish;

[0046] White ink is printed in the non-transfer area or the transfer area.

[0047] A digital printing method, wherein the substrate is a transparent material and printing is performed on the reverse side of the substrate, and the printing method comprises the following steps:

[0048] Printing the entire color pattern with color ink on a transparent substrate;

[0049] Print varnish on the pattern area that needs to be transferred, and print white ink on the area that does not need to be transferred, and then cure;

[0050] Transfer the pattern on the printed transfer varnish.

[0051] Compared with the prior art, a digital printing method in an embodiment of the present invention has the following beneficial effects: by printing on the back of a transparent substrate, not only can the pattern be protected to ensure that the product always has a good visual effect, but also the effect of printing on the back and viewing the front side, and printing on the back and viewing both the front and back sides can be achieved, which not only does not affect the sensory effect of the pattern, but also can achieve a better sensory effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a flow chart of a first embodiment of the digital printing method of the present invention.

[0053] Figure 2 This is the schematic diagram of powder spraying.

[0054] Figure 3 This is a flow chart of a second embodiment of the digital printing method of the present invention.

[0055] Figure 4 This is a flow chart of a third embodiment of the digital printing method of the present invention.

[0056] Figure 5 This is a flow chart of a fourth embodiment of the digital printing method of the present invention.

[0057] Figure 6 This is a flow chart of a fifth embodiment of the digital printing method of the present invention.

[0058] Figure 7 This is a flow chart of a sixth embodiment of the digital printing method of the present invention.

[0059] Figure 8 This is a flow chart of Embodiment 7 of the digital printing method of the present invention.

[0060] Fig. 9 This is a flow chart of Embodiment 8 of the digital printing method of the present invention.

[0061] Fig.10 This is a flow chart of a ninth embodiment of the digital printing method of the present invention.

[0062] Fig.11 This is a flow chart of a tenth embodiment of the digital printing method of the present invention.

[0063] Fig.12 This is a flow chart of the digital printing method according to the eleventh embodiment of the present invention.

[0064] Fig.13 This is a flow chart of a twelfth embodiment of the digital printing method of the present invention.

[0065] Fig.14 This is a flow chart of a thirteenth embodiment of the digital printing method of the present invention. DETAILED DESCRIPTION

[0066] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but are not intended to limit the scope of the present application.

[0067] Embodiment 1

[0068] like Figure 1 As shown, a digital printing method according to a preferred embodiment of the present invention comprises the following steps:

[0069] S1, the substrate is fixed on the work platform. The work platform is provided with a positioning pin, and a printing mold is provided corresponding to the positioning pin. During printing, the substrate is sleeved on the printing mold to prevent the substrate from being crushed and deformed or shifted during the printing process, thereby ensuring the subsequent printing quality.

[0070] S2, printing varnish on the substrate, spraying powder, and curing at the same time.

[0071] Among them, the printing varnish is carried out by a printing trolley. During the construction, the varnish (UV resin, transfer glue, hot stamping varnish) is printed while the powder is sprayed, so that the area on the mirror color pattern that needs the glitter effect can achieve the desired visual effect, and the powder is sprayed and cured at the same time. Finally, the excess powder is sucked clean to complete the varnish + powder spraying. The above-mentioned printing varnish, powder spraying and curing are carried out at the same time.

[0072] The powder spraying process is to sprinkle various optical powders and special functional powder granular materials such as glitter powder, sequin powder, fluorescent powder, fantasy powder, diamond powder, chameleon powder, ultraviolet color-changing powder, temperature color-changing powder, magnetic cat's eye powder on the surface or middle layer of the printed product inkjet varnish (UV resin, transfer glue, hot stamping varnish) and solidify and adhere. That is, after the printing is completed, the varnish is first printed on the substrate and solidified, and then the powder spraying is carried out.

[0073] The powder spraying is performed by a powder spraying mechanism, which is arranged on a printing carriage, and a printing mechanism for printing is arranged inside the printing carriage. The powder spraying mechanism is arranged on both sides of the printing carriage, and one or more powder spraying mechanisms are arranged on each side, and when there are multiple powder spraying mechanisms, the multiple powder spraying mechanisms are distributed in a rectangular array. The multiple powder spraying mechanisms are all used to spray different glitter powders; or some of the powder spraying mechanisms are used to spray different glitter powders, and the other part of the powder spraying mechanisms are used to spray the same glitter powder.

[0074] like Figure 2As shown, therefore, combined with the movement of the powder spraying mechanism driven by the nozzle carriage and the setting method of the powder spraying mechanism itself, the powder spraying mechanism can achieve a very beautiful three-dimensional space effect on the substrate. The way to achieve this is to present a variety of visual effects by performing multiple spraying of varnish and different powder spraying methods. We take the example of setting four powder spraying mechanisms on one side of the nozzle carriage:

[0075] Implementation process: First, the printhead carriage will spray a layer of varnish on the substrate (the thickness depends on the need), and then the powder spraying mechanism will sprinkle glitter powder. The powder spraying method can be a variety of combinations, each time with different powders. The four powder spraying mechanisms on one side of the printing carriage can realize four scans and prints, each time with different powders, and any combination can be realized; it can also realize one scan and print with 2 or more powders side by side, for example Figure 2 In the middle, multiple rows of powder spraying such as ① and ②, ① and ④, ② and ③, ③ and ④ are arranged side by side to achieve the effect of up and down rows on the product, and can also achieve multi-level three-dimensional effects. For example, scan and print the first pass of varnish (UV resin, transfer glue, hot stamping varnish) and sprinkle a bottom layer of powder (it can be various combinations of powder spraying), and then increase the varnish inkjet amount by adding varnish nozzles. After the thicker varnish covers the first layer, powder spraying is carried out. This multi-layer powder spraying can be two or three layers. The increase in layers realizes a powder spraying process with a three-dimensional effect. In the varnish printing area, since the nozzle printing area is wider, the powder spraying area is relative to the printing area. The varnish area is narrow. When the trolley moves from left to right, it prints the first area. At the same time, the powder spraying mechanism sprays powder at the left rear of the varnish area. When the trolley moves to the far right, the first area is sprayed and cured by the UV lamp. At this time, the marble beam will move a certain distance along the Y axis, and then the trolley moves from left to right to spray varnish. At this time, the varnish in the second area will cover the powder spraying area when the first area is sprayed. In this way, the reciprocating printing and powder spraying will make various powders with special matching be covered layer by layer to present a three-dimensional space effect. The powder exists inside the space, presenting a beautiful effect. The powder spraying mechanism can spray powder alternately or simultaneously. In this way, the powder spraying is carried out in coordination with each other, so that the surface of the substrate can achieve more diverse and beautiful effects.

[0076] In addition, magnetic powder can also be used. Since magnetic powder can change into different visual effects according to the change of different magnetic attraction directions of magnets, in order to diversify the printing powder spraying effect, the magnetic attraction mode of magnets should be changed in many ways. Magnetic optical powder can form a beautiful optical gradient effect by changing the attraction of magnetic field.

[0077] There are many ways to use magnets, for example: 1. The magnet is fixed in the corresponding position and moves with the printing carriage; 2. The magnet can rotate, and the number of magnets can be changed according to requirements. The magnet rotates while moving with the printing carriage, and the transfer varnish containing magnetic powder is magnetically attracted to change the arrangement of the magnetic powder to achieve the desired visual effect; 3. The magnet can move up and down and move with the printing carriage, so that it can be magnetically attracted at intervals, which can produce intermittent visual effects on the product; 4. Electromagnets can also be used for intermittent magnetism to achieve different visual effects. The above magnets can be used in a fixed manner on the printing carriage and move with the printing carriage.

[0078] Another way is to design the magnet and the curing lamp structure together to form a separate magnetic fixing device. The use of the magnet also includes the above several or even more ways. The device can be installed and used together with the printing carriage, or the device can be used alone.

[0079] In this embodiment, during the powder spraying process, it is necessary to suck away the excess dust. The excess dust is sucked away by the suction device to prevent the printing assembly from being polluted and the nozzle from being blocked, thereby preventing the air from being polluted and achieving environmental protection.

[0080] S3, the inkjet system sprays the color ink onto the substrate for printing, and prints out the corresponding mirror color pattern. The printing is carried out by a printing carriage, and a printing mechanism for printing is provided inside the printing carriage. When printing, the required graphics are first input into the computer, and after being edited and processed by the electronic color separation system, the computer controls the inkjet system to directly spray varnish or color ink onto the fabric for printing. Inkjet printing can be divided into two types according to the inkjet principle: continuous inkjet and on-demand inkjet.

[0081] 1. Continuous injection

[0082] The principle of continuous jetting is to apply high-frequency oscillation pressure to the ink so that the ink is ejected from the nozzle to form a uniform and continuous flow of micro-droplets. An electric field that changes synchronously with the graphic photoelectric conversion signal is set at the nozzle. The ejected droplets are selectively charged in the charging electric field. When the droplet flow continues to pass through the deflection electric field, the charged droplets are deflected under the action of the electric field, and the uncharged droplets continue to maintain a straight-line flight state. The droplets flying in a straight line cannot reach the substrate and are recovered by the liquid collector. The charged droplets are ejected onto the substrate to complete the printing.

[0083] 2. On-demand spraying

[0084] The working principle of the on-demand jet printing system is that when printing is required, the system applies high-frequency mechanical force and electromagnetic thermal shock to the ink in the nozzle, so that it forms tiny droplets that are ejected from the nozzle and are controlled by a computer to be ejected to the set pattern. The most widely used on-demand jet printing technology is thermal inkjet technology, which relies on thermal pulsation to generate ink droplets. A heating resistor wire is controlled by a computer to a specified temperature, causing the ink to be gasified (atomized) and then ejected from the nozzle. Another technology is the voltage jet system, which is controlled by a computer to impose a potential on the conductive material, causing the conductive material to compress in the direction of the electric field and expand in the vertical direction, thereby ejecting the ink.

[0085] Digital printing uses a nozzle to print colored ink and varnish (UV resin, transfer glue, hot stamping varnish) on the substrate.

[0086] S4, white ink is sprayed on the substrate to achieve printing. After the finished product is turned over, you can see the front-view pattern with a variety of three-dimensional visual effects.

[0087] Embodiment 2

[0088] like Figure 3 As shown, the difference between this embodiment and the first embodiment is that transfer is still required, specifically:

[0089] Before printing white ink on the substrate, the following steps are also included:

[0090] 1. Print transfer varnish (UV resin, transfer glue, hot stamping varnish) on the area where the substrate needs to be transferred, and print hot stamping varnish on the area where transfer is not required, and solidify. The printing method adopts scanning inkjet printing or multi-pass printing.

[0091] 2. Transfer the printing material.

[0092] In order to achieve perfect digital printing and transfer effects for products with multiple curved surfaces and complex shapes with large height differences, the four sides of the transfer film need to be tightened during transfer. The transfer film can be tightened by a pneumatic mechanism, and the tension on the four sides of the transfer film can be precisely controlled by controlling the air pressure to control the pulling force of the film, ultimately solving the problem of wrinkling of digital printing and transfer film for products with multiple curved surfaces and complex shapes with large height differences (existing transfer and hot stamping machines are all tightened in one direction). Of course, other ways of tightening can also be used, which are not limited here.

[0093] In the present invention, transfer is divided into two types, namely thermal transfer and hot stamping. The thermal transfer process transfers the layer on the transfer film to the surface of the substrate by heating and pressurizing, which is realistic and beautiful, greatly improving the grade of the product. The hot stamping process uses the principle of hot pressure transfer to transfer the aluminum layer in the electrochemical aluminum foil to the surface of the substrate to form a special metal effect. Specifically:

[0094] When the transfer is thermal transfer, the transfer film is heated by the transfer roller and pressed against the substrate;

[0095] Among them, the heating temperature of the transfer film is 80-200℃, such as 90℃, 100℃, 120℃, 160℃, 180℃, etc.; the transfer speed is 0.1-10 meters per minute, such as 0.2 meters, 0.6 meters, 1 meter, 2 meters, 3 meters, 5 meters, 8 meters, etc.; the transfer pressure is 1.8-2.2t, such as 1.9t, 2t, 2.1t, etc. Specific parameters can be selected according to actual conditions, but through experiments, it is found that when any one or two of the above temperature, speed and pressure parameters are not within the above range, a good transfer effect cannot be achieved. If the temperature or pressure does not reach the above range, the layer on the transfer film cannot be completely transferred to the substrate. When the temperature or pressure exceeds the above range, the transfer film and the substrate will stick together, affecting the product quality; if the speed exceeds the above range, the layer on the transfer film cannot be completely transferred to the substrate. When the speed is lower than the above range, it will affect the transfer humidity.

[0096] Therefore, when selecting, it is necessary to ensure that the temperature, speed and pressure meet the above ranges at the same time to ensure the best transfer effect.

[0097] When the transfer is hot stamping, the temperature of the anodized aluminum foil is 130°~160°, the hot stamping pressure is above 5t, and the hot stamping speed is 0.5~0.7 meters per minute. In actual production, it is also necessary to ensure that the temperature, speed and pressure meet the above ranges at the same time to ensure the best hot stamping effect.

[0098] Embodiment 3

[0099] like Figure 4 As shown, the first and second embodiments are both printed on the reverse side and viewed from the front side. This embodiment can achieve the effect that both the front and the reverse side can be viewed when printing on the reverse side, that is, further printing is performed on the basis of the first embodiment. Specifically:

[0100] After printing white ink, the following steps are also included:

[0101] The inkjet system sprays colored ink onto the substrate for printing, printing the corresponding positive color pattern;

[0102] The substrate is sprayed with varnish, powdered and cured at the same time.

[0103] The processes of printing and powder spraying are the same as above and will not be repeated here.

[0104] Embodiment 4

[0105] like Figure 5As shown, this embodiment can achieve the effect of printing on the reverse side so that both the front and the reverse sides can be viewed. It is further printed on the basis of the second embodiment, specifically:

[0106] After printing white ink, the following steps are also included:

[0107] The inkjet system sprays colored ink onto the substrate for printing, printing the corresponding positive color pattern;

[0108] The substrate is sprayed with varnish, powdered and cured at the same time.

[0109] The processes of printing and powder spraying are the same as above and will not be repeated here.

[0110] Embodiment 5

[0111] like Figure 6 As shown, the difference between this embodiment and the first embodiment is that the order of printing and powder spraying is different, and the rest is the same, which will not be repeated here. The specific digital printing method is:

[0112] The substrate is made of transparent material and is printed on the reverse side of the substrate. The printing method includes the following steps:

[0113] The inkjet system sprays colored ink onto the substrate for printing, printing out the corresponding mirror-image colored pattern;

[0114] Print varnish on the substrate, spray powder, and cure at the same time;

[0115] Print white ink on the substrate.

[0116] Embodiment 6

[0117] like Figure 7 As shown, the difference between this embodiment and the first embodiment is that transfer is still required, specifically:

[0118] Before printing white ink on the substrate, the following steps are also included:

[0119] Print the hot-blocking varnish on the area of ​​the substrate that does not need to be transferred and solidify it. Since the powder spraying operation has been carried out before this step, and the varnish has been printed during the powder spraying process, it is only necessary to print the hot-blocking varnish on the area that does not need to be transferred before the transfer. After the hot-blocking varnish is printed, the transfer process is carried out to complete the transfer.

[0120] Embodiment 7

[0121] like Figure 8 As shown, the fifth and sixth embodiments are both printed on the reverse side and viewed from the front side. This embodiment can achieve the effect that both the front and the reverse side of the reverse side can be viewed, that is, further printing is performed on the basis of the fifth embodiment. Specifically:

[0122] After printing white ink, the following steps are also included:

[0123] Print varnish on the substrate, spray powder, and cure at the same time;

[0124] The inkjet system sprays colored ink onto the substrate for printing, printing the corresponding positive color pattern;

[0125] Print varnish on the substrate and perform UV curing.

[0126] The processes of printing and powder spraying are the same as above and will not be repeated here.

[0127] Embodiment 8

[0128] like Fig. 9 As shown, this embodiment can achieve the effect of reverse printing that both the front and back sides can be viewed, and further printing is performed on the basis of the sixth embodiment, specifically:

[0129] After printing white ink, the following steps are also included:

[0130] Print varnish on the substrate, spray powder, and cure at the same time;

[0131] The inkjet system sprays colored ink onto the substrate for printing, printing the corresponding positive color pattern;

[0132] Print varnish on the substrate and perform UV curing.

[0133] The processes of printing and powder spraying are the same as above and will not be repeated here.

[0134] Embodiment 9

[0135] like Fig.10 As shown, the difference between this embodiment and the first embodiment is that white ink is not sprayed, but varnish and powder are sprayed, so that the reverse printing can achieve the effect that both the front and the back can be viewed. Specifically:

[0136] The substrate is made of transparent material and is printed on the reverse side of the substrate. The printing method includes the following steps:

[0137] Print varnish on the substrate, spray powder, and cure at the same time;

[0138] The inkjet system sprays colored ink onto the substrate for printing, printing out corresponding colored patterns.

[0139] This embodiment mainly aims at color patterns that are the same when viewed from the mirror image and the front side, so the same pattern can be seen on both sides when printed in reverse, and then varnish is printed on the color pattern and a powder spraying process is performed to complete the printing; this printing method is suitable for substrates with the same pattern on both sides, but since the front and back sides can be the same or different powder spraying methods, the same color pattern can be seen on both sides of the substrate, the same powder spraying visual effect or the same pattern with different visual effects, so that the pattern has more spatial three-dimensionality and diversified color effects with convex and concave sense.

[0140] Embodiment 10

[0141] like Fig.11 As shown, the difference between this embodiment and the fifth embodiment is that white ink is not sprayed, but sprayed and varnish is cured, so that the reverse printing can be viewed on both the front and back sides. Specifically:

[0142] The substrate is made of transparent material and is printed on the reverse side of the substrate. The printing method includes the following steps:

[0143] The inkjet system sprays colored ink onto the substrate for printing, printing out the corresponding mirror-image colored pattern;

[0144] Print varnish on the substrate, spray powder, and cure at the same time;

[0145] The inkjet system sprays colored ink onto the substrate for printing, printing the corresponding positive color pattern;

[0146] Print varnish on the substrate and perform UV curing.

[0147] In this embodiment, the mirror image pattern and the normal pattern may be the same or different when viewed from both sides.

[0148] By adopting the digital printing method of the present invention for printing, by printing on the reverse side of the transparent substrate, not only can the pattern be protected to ensure that the product always has a good visual effect, but also the effect of the reverse side printing being viewed from the front side, and the reverse side printing being viewed from both the front side and the reverse side can be achieved, which not only does not affect the sensory effect of the pattern, but also can achieve a better sensory effect.

[0149] Specifically, the printing method of embodiments one, two, five, and six of the present application is a reverse-printing method, which is suitable for printing on transparent substrates. The substrate needs to be turned over to see the printed positive pattern. This printing method can print out colorful patterns with three-dimensional and concave-convex visual effects depending on the printing method and the powder spraying method.

[0150] The printing method of embodiments three, four, seven, eight, nine and ten belongs to the reverse printing and can be viewed from both sides, which is suitable for transparent substrates. This printing method makes the patterns on the substrates more colorful. After printing, the same or different patterns can be seen on both sides, and the two sides can also have the same or different color effects. Reverse printing and viewing from both sides can have more powder spraying (powder spraying) visual effects, and a rich visual effect of three-dimensional space and convex and concave sense.

[0151] In addition, the color ink can also be printed in two steps, specifically:

[0152] Embodiment 11

[0153] This embodiment is used in the printing process of printing on the reverse side and looking at the front side, and there is no hot-scalding varnish during transfer. Fig.12 As shown, the following steps are included:

[0154] The nozzle of the inkjet system prints the pattern of the area to be transferred onto the transparent substrate in a mirror image;

[0155] Spray transfer varnish (UV resin, transfer glue, hot stamping varnish) on the color pattern to be transferred;

[0156] The pattern part of the inkjet transfer varnish is transferred (thermal transfer, hot stamping) through the transfer mechanism, and the corresponding medium color effect is transferred to the part of the inkjet transfer glue;

[0157] Print the part of the pattern that does not need to be transferred onto a transparent substrate;

[0158] The whole is printed with white ink as needed.

[0159] In addition, you can also use special color inks that are not easy to stick to the transfer film. The printing methods include the following two:

[0160] Embodiment 12

[0161] Please see attached Fig.13 , which comprises the following steps:

[0162] First, the entire color pattern is printed on the transparent substrate using a special color ink that is not easy to stick to the transfer film;

[0163] Then spray varnish on the pattern area that needs to be transferred and cure it;

[0164] Then transfer (thermal transfer, hot stamping);

[0165] Finally, white ink is printed on the non-transfer area or the transfer area as needed.

[0166] Embodiment 13

[0167] Please refer to the attached Fig.14 , which comprises the following steps:

[0168] First, print the entire color pattern on the transparent substrate with a special color ink that is not easy to stick to the transfer film. At the same time, print the transfer varnish (UV resin, transfer glue, hot stamping varnish) in the area where the pattern needs to be transferred; print white ink in the area where the transfer is not required;

[0169] After the above is completed and cured, transfer (thermal transfer, hot stamping) is performed so that the area that needs to be transferred can be transferred with the corresponding medium color effect (electroplating, laser, photolithography texture effect, some special metal colors such as gold and silver, and any pigments and powders that can be carried by the transfer film, etc.)

[0170] In summary, the color pattern is printed twice, that is, the color and varnish of the transfer area are printed first, and then the color and overall white of other areas are printed, in order to prevent the color that should not be transferred from sticking to the transfer coating. Another method is to use a special color ink that is not easy to stick to the transfer film coating to print all the colors at one time, then print the varnish, then transfer, and finally print the white as needed. It is also possible to print the color varnish and white at one time and then transfer the varnish area.

[0171] The above are the steps and working principles of the printing process of reverse printing and front view. There is also a method of reverse printing and front and back view. This reverse printing and front and back view is based on the above Fig.12 , Fig.13 , Fig.14 , after completion, there are two more steps:

[0172] The first type: the inkjet system sprays colored ink onto the substrate for printing, and prints out the corresponding positive color pattern; prints varnish on the substrate, sprays powder, and solidifies at the same time.

[0173] The second method: printing varnish on the substrate, spraying powder and curing at the same time; the inkjet system sprays color ink onto the substrate for printing, printing the corresponding positive color pattern; printing varnish on the substrate and UV curing.

[0174] In summary, by adopting the method of the present application for printing, both inkjet printing and powder spraying can be realized, the powder spraying range and powder spraying amount are controllable, and the excess dust is sucked out by the suction device to prevent the contamination of the inkjet printing component to block the nozzle, and to prevent air pollution to achieve environmental protection; through the combination of transfer (thermal transfer, hot stamping) and powder spraying, the pattern can be made more realistic and more visual effects can be added, so that designers can use more design elements to design products, and the pattern can restore the color of the real object and add electroplating, laser, photolithography texture effects, gold and silver and other special metal colors and can be carried by the transfer film. The various process effects of any transfer materials such as pigments and powders, as well as various optical powders and special functional powders such as glitter powder, diamond powder, chameleon powder, fluorescent powder, ultraviolet color-changing powder, temperature color-changing powder, reflective powder, luminous powder, magnetic cat's eye powder, etc., can ultimately achieve a variety of digital inkjet printing effects through the multifunctional digital printing machine of the present invention. Various processes can be realized on one machine, so that the printing position is precise, the effect is unique, and the operation is simple; various machines and equipment can also be used to cooperate to complete these printing processes. The above-mentioned technical effects can be achieved by simply following the above-mentioned process steps.

[0175] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A digital printing method, characterized in that: The substrate is made of transparent material and is printed on the reverse side of the substrate. The printing method includes the following steps: Print varnish on the substrate, spray powder, and cure at the same time; The inkjet system sprays colored ink onto the substrate for printing, printing out the corresponding mirror-image colored pattern; Print white ink on the substrate.

2. The digital printing method according to claim 1, characterized in that: Before printing white ink on the substrate, the following steps are also included: Print transfer varnish on the area where the substrate needs to be transferred, and print hot-blocking varnish on the area where transfer is not required, and then cure; Transfer the printing material.

3. The digital printing method according to claim 1 or 2, characterized in that: After printing white ink, the following steps are also included: The inkjet system sprays colored ink onto the substrate for printing, printing the corresponding positive color pattern; The substrate is sprayed with varnish, powdered and cured at the same time.

4. A digital printing method, characterized in that: The substrate is made of transparent material and is printed on the reverse side of the substrate. The printing method includes the following steps: The inkjet system sprays colored ink onto the substrate for printing, printing out the corresponding mirror-image colored pattern; Print varnish on the substrate, spray powder, and cure at the same time; Print white ink on the substrate.

5. The digital printing method according to claim 4, characterized in that: Before printing white ink on the substrate, the following steps are also included: Print the hot-repellent varnish on the area of ​​the substrate that does not need to be transferred and cure it; Transfer the printing material.

6. The digital printing method according to claim 4 or 5, characterized in that: After printing white ink, the following steps are also included: Print varnish on the substrate, spray powder, and cure at the same time; The inkjet system sprays colored ink onto the substrate for printing, printing the corresponding positive color pattern; Print varnish on the substrate and perform UV curing.

7. A digital printing method, characterized in that: The substrate is made of transparent material and is printed on the reverse side of the substrate. The printing method includes the following steps: Print varnish on the substrate, spray powder, and cure at the same time; The inkjet system sprays colored ink onto the substrate for printing, printing out corresponding colored patterns; The substrate is sprayed with varnish, powdered and cured at the same time.

8. A digital printing method, characterized in that: The substrate is made of transparent material and is printed on the reverse side of the substrate. The printing method includes the following steps: The inkjet system sprays colored ink onto the substrate for printing, printing out the corresponding mirror-image colored pattern; Print varnish on the substrate, spray powder, and cure at the same time; The inkjet system sprays colored ink onto the substrate for printing, printing the corresponding positive color pattern; Print varnish on the substrate and perform UV curing.

9. A digital printing method, characterized in that: The substrate is made of transparent material and is printed on the reverse side of the substrate. The printing method includes the following steps: The inkjet system prints the pattern of the area to be transferred onto the transparent substrate in a mirror image; Spray transfer varnish on the color pattern to be transferred; Transfer the pattern part of the inkjet transfer varnish; Print the part of the pattern that does not need to be transferred onto a transparent substrate; The whole is printed with white ink.

10. A digital printing method, characterized in that: The substrate is made of transparent material and is printed on the reverse side of the substrate. The printing method includes the following steps: Printing the entire color pattern with color ink on a transparent substrate; Print varnish on the pattern area to be transferred and cure it; Transfer the pattern part of the inkjet transfer varnish; White ink is printed in the non-transfer area or the transfer area.

11. A digital printing method, characterized in that: The substrate is made of transparent material and is printed on the reverse side of the substrate. The printing method includes the following steps: Printing the entire color pattern with color ink on a transparent substrate; Print varnish on the pattern area that needs to be transferred, and print white ink on the area that does not need to be transferred, and then cure; Transfer the pattern on the printed transfer varnish.

Images