CN114161707A - Printing apparatus and printing method - Google Patents

Abstract

The application discloses a printing device and a printing method, wherein an ultraviolet curing resin is sprayed in the shape of a single liquid drop by adopting a spraying device, a spraying point or a spraying print formed by the liquid drop is irradiated by adopting an ultraviolet light excitation device, the irradiation range of the ultraviolet light is equal to or less than the coverage range of the single liquid drop or a plurality of liquid drops, and an uncured part can be optionally eluted by adopting an elution device. Therefore, the embodiment of the application can solve the problem that the ultraviolet curing resin cannot obtain a high-precision three-dimensional forming structure when being printed in a large range, can also obtain a three-dimensional forming object with a specific precise shape and/or a required height by controlling the independent curing and subsequent elution of each injection point, and can also solve the problem of overflow generated after OLED packaging.

Description

Printing apparatus and printing method

Technical Field

The application relates to the technical field of printing forming in display equipment, in particular to printing equipment and a printing method.

Background

In the display field, ultraviolet light curing glue is often used for printing and forming at present. During printing and forming, ultraviolet curing glue (also called UV printing glue) in a specific range is often sprayed in a region to be printed, and then the ultraviolet curing glue in the specific range is irradiated by ultraviolet light to be cured and formed, so as to form a formed object. However, the uv-curable glue is in a liquid state before being cured and has a certain fluidity, and if the spraying range is too large, the flowing area of the uv-curable glue may exceed the irradiation range of the uv light and cannot be cured, thereby corroding or even damaging components outside the irradiation range.

In addition, the fluidity and the spraying range of the ultraviolet curing glue are too large, so that the ultraviolet curing glue is influenced by gravity, a structure with convex two sides and slightly concave middle is formed in the whole flowing area, and even if ultraviolet light is adopted for rapid irradiation, a good three-dimensional structure cannot be formed finally, and high-precision patterning can not be realized. For example, referring to fig. 14, in an OLED display, a dense organic water-stop film 31 is formed on a screen body of the display using Ink by using an inkjet printing technology (IJP), and the organic water-stop film 31 is used to encapsulate the OLED display. However, in order to form the organic water-stop film smoothly with the ink, it is necessary to form a frame 32 (also called a bank) around the organic water-stop film to be formed in advance. The dam is often formed using UV printing technology using an ultraviolet light curing glue. However, ultraviolet curing glue can become flat under self gravity after being sprayed the liquid level, and this kind of levelling nature phenomenon can lead to the frame height that forms after the solidification not enough to can't form better separation to the printing ink in the frame, printing ink in the frame can spill over from the frame in subsequent use, and this kind of overflow phenomenon can make printing ink cause the pollution to the components and parts outside the frame, also can influence the display effect.

Disclosure of Invention

An object of some embodiments of the present application is to provide a printing apparatus and a printing method, which can at least overcome the problem that it is difficult to form a three-dimensional molded object with high precision when ultraviolet light curing glue is sprayed in a large range.

Some embodiments of the present application provide a printing apparatus, comprising: the device comprises a spraying device, an ultraviolet light excitation device and a control device.

The spraying device is used for continuously spraying ultraviolet curing resin on the surface of an area to be sprayed dropwise in the shape of single liquid drops, each liquid drop forms a spraying point, each spraying point is separated by a certain distance, and the area covered by all the spraying points forms a piece of spraying print. An ultraviolet curable resin is defined as a resin that is capable of curing under ultraviolet light irradiation, but is not cured without being irradiated by ultraviolet light. If the ultraviolet curing resin is partially irradiated with ultraviolet light, the ultraviolet curing resin is partially cured, the cured portion is not eluted by the eluent, and the uncured portion is eluted by the eluent.

The ultraviolet light excitation device is used for applying ultraviolet light irradiation to the whole injection print to enable ultraviolet curing resin of each injection point to be cured to form curing points corresponding to the injection points one by one, and the irradiation range of the ultraviolet light is equal to the coverage range of the injection print.

The control device is used for obtaining the information of the end of the spraying after one of the spraying device is finished, starting the ultraviolet light excitation device according to the information of the end of the spraying, obtaining the information of the end of the irradiation after the ultraviolet light irradiation time of the ultraviolet light excitation device is finished, and starting the spraying device according to the information of the end of the irradiation to carry out the next spraying until the spraying frequency of the spraying device is greater than the preset threshold value of the spraying frequency.

In some embodiments of the present application, the spray device is located on the same side of the area to be sprayed as the ultraviolet light excitation device.

In other embodiments of the present application, the spray device and the ultraviolet light excitation device are located on both sides of the area to be painted, which allows penetration of ultraviolet light.

In some embodiments of the present application, the wavelength of the ultraviolet light may be selected from any one of values 300 to 400nm, and may also be selected from any one of values 315 to 380 nm.

In other embodiments of the present application, the size of individual droplets produced by the ejection head of the ejection device is from 5 μm to 5 mm.

Some embodiments of the present application provide a printing method comprising the steps of:

(1) continuously spraying ultraviolet curing resin on the surface of an area to be sprayed dropwise in the shape of single liquid drop, enabling each liquid drop to form a spraying point and enabling each spraying point to be separated by a certain distance, and enabling the area covered by all the spraying points to form a piece of spraying print;

(2) applying ultraviolet light irradiation to the whole injection print to cure the ultraviolet curing resin of each injection point to form curing points corresponding to each injection point one by one, so that the irradiation range of the ultraviolet light is equal to the coverage range of the injection print;

(3) and (3) repeating the step (1) and the step (2) until the injection times of the injection device are larger than a preset injection time threshold value.

Some embodiments of the present application provide a printing apparatus, comprising: the device comprises a spraying device, a plurality of ultraviolet light excitation devices, an elution device and a control device.

Wherein the spraying device is used for continuously spraying the ultraviolet curing resin on the surface of an area to be sprayed in a drop-by-drop mode in a single drop mode, each drop forms a spraying point, and each spraying point is separated by a distance. The ultraviolet curable resin includes an ultraviolet curable epoxy resin. The epoxy resin (EpoxyResin) can be quickly converted into a solid state from a liquid state after being irradiated by ultraviolet light, the part which is in the solid state cannot be washed away by eluent, and the part which is not irradiated by the ultraviolet light is still in the liquid state and can be eluted and removed by the eluent.

The ultraviolet light excitation devices are used for respectively applying ultraviolet light irradiation to each spraying point to enable the ultraviolet curing resin of each spraying point to be cured so as to form curing points corresponding to each spraying point one by one, and the irradiation range of the ultraviolet light emitted by each ultraviolet light excitation device is smaller than or equal to the coverage range of each spraying point corresponding to each spraying point one by one.

The elution device is used for eluting uncured parts in each injection point by using an elution liquid after each injection point forms a one-to-one corresponding curing point, so that each curing point forms a one-to-one corresponding forming point.

The control device is used for acquiring the information of the end of the injection after the completion of one of the injections of the injection device and starting the ultraviolet light excitation device according to the information of the end of the injection; acquiring irradiation end information after the ultraviolet irradiation time of the ultraviolet light excitation device is ended, and starting the elution device according to the irradiation end information; and acquiring the injection starting information after the elution is finished, and starting the injection device according to the injection starting information to perform the next injection until the injection frequency of the injection device is greater than a preset injection frequency threshold value.

In some embodiments of the present application, the spray device is located on the same side of the area to be sprayed as the ultraviolet light excitation device.

In other embodiments of the present application, the spray device and the ultraviolet light excitation device are located on both sides of the area to be painted, which allows penetration of ultraviolet light.

In other embodiments of the present application, the size of individual droplets produced by the jetting head of the jetting device is from 2mm to 35 mm.

In some embodiments of the present application, the number of uv light excitation devices corresponds to the number of ejection points.

Some embodiments of the present application also provide a printing method, comprising:

(1) continuously spraying ultraviolet curing resin on the surface of an area to be sprayed dropwise in the shape of single liquid drops, so that each liquid drop forms a spraying point and each spraying point is separated by a certain distance;

(2) respectively applying ultraviolet light irradiation to each spraying point to cure the ultraviolet curing resin of each spraying point so as to form curing points corresponding to each spraying point one by one, wherein the irradiation range of the ultraviolet light emitted by each ultraviolet light excitation device is smaller than or equal to the coverage range of each spraying point corresponding one by one;

(3) eluting the uncured part in each injection point by using an eluent to ensure that each curing point forms a one-to-one corresponding forming point;

(4) and (4) repeating the steps (1) to (3) until the injection frequency of the injection device is greater than a preset injection frequency threshold value.

Some embodiments of the present application also provide a printing apparatus, comprising: the device comprises a spraying device, an ultraviolet light excitation device, an elution device and a control device.

Wherein, the spraying device is used for spraying the ultraviolet curing resin on the surface of the area to be sprayed in the shape of a single liquid drop, so that the single liquid drop forms a single spraying point.

The ultraviolet light excitation device is used for applying ultraviolet light irradiation to the single spraying points to cure the ultraviolet curing resin positioned at the single spraying points to form curing points corresponding to the single spraying points one by one, and the irradiation range of the ultraviolet light is smaller than or equal to the coverage range of the single spraying points corresponding to one by one. If the size of the single liquid drop sprayed by the spraying device is larger than the irradiation range of the ultraviolet light emitted by the ultraviolet light excitation device, partial solidification and partial elution can be realized, so that the three-dimensional forming object with the required shape and forming precision is generated.

The elution device is used for eluting uncured parts in the single injection points by using an elution liquid after the single injection points form one-to-one corresponding curing points so as to enable the curing points to form one-to-one corresponding forming points.

The control device is used for acquiring the information of the end of the injection after the completion of one of the injections of the injection device and starting the ultraviolet light excitation device according to the information of the end of the injection; acquiring irradiation end information after the ultraviolet irradiation time of the ultraviolet light excitation device is ended, and starting the elution device according to the irradiation end information; and acquiring the injection starting information after the elution is finished, and starting the injection device according to the injection starting information to perform the next injection until the injection frequency of the injection device is greater than a preset injection frequency threshold value.

In some embodiments of the present application, the spray device is located on the same side of the area to be sprayed as the ultraviolet light excitation device.

In other embodiments of the present application, the spray device and the ultraviolet light excitation device are located on both sides of the area to be painted, which allows penetration of ultraviolet light.

In other embodiments of the present application, the size of individual droplets produced by the ejection head of the ejection device is from 5mm to 5 cm.

There is also provided in some embodiments of the present application a method of printing, including the steps of:

(1) spraying the ultraviolet curing resin on the surface of an area to be sprayed in the shape of a single liquid drop, so that the single liquid drop forms a single spraying point;

(2) applying ultraviolet irradiation to the single spraying points to cure the ultraviolet curing resin positioned at the single spraying points to form curing points corresponding to the single spraying points one by one, wherein the irradiation range of the ultraviolet is smaller than or equal to the coverage range of the single spraying points corresponding one by one;

(3) eluting uncured parts in the single injection points by using an eluent so as to enable the curing points to form one-to-one corresponding forming points;

(4) and (4) repeating the steps (1) to (3) until the injection frequency of the injection device is greater than a preset injection frequency threshold value.

The printing device and the printing method in the embodiment of the application adopt the jetting device to jet the ultraviolet curing resin in the shape of a single liquid drop, adopt the ultraviolet light excitation device to irradiate a jetting point or a jetting print formed by the liquid drop, the irradiation range of the ultraviolet light is equal to or less than the coverage range of the single liquid drop or the plurality of liquid drops, and optionally adopt the elution device to elute the uncured part. Therefore, some embodiments of the present application can solve the problem that a high-precision three-dimensional molding structure cannot be obtained when the ultraviolet curing resin is printed in a large range, can also obtain a three-dimensional molding object with a specific precise shape and/or a required height by controlling the independent curing and subsequent elution of each injection point, and can also solve the problem of overflow generated after the OLED is packaged.

Due to the adoption of the technical scheme or any combination of the technical scheme of the embodiment, the embodiment of the application achieves the following beneficial effects:

first, in some embodiments of the present application, the irradiation range of the ultraviolet light is not greater than the coverage range of the ejection tracks or the ejection points, so that the ultraviolet light does not burn other display structures outside the coverage range of the ejection tracks or the ejection points, thereby eliminating the need to use an ultraviolet light mask plate to shield the irradiation of the ultraviolet light to other internal structures of the display device, and reducing the workload of individually designing a mask plate with a specific shape and size.

Second, in some embodiments of the present application, the spraying device does not spray a large range of UV printing glue (or ultraviolet curing resin) at a time, but sprays the UV printing glue in the form of droplets, so that the problem that the large range of UV printing glue cannot obtain a high-precision three-dimensional molding structure due to its own fluidity and its own gravity does not occur.

Third, in some embodiments of the present application, the printing apparatus enables each ejection point to be cured individually, and a three-dimensional molded object having a specific precise shape can be obtained by controlling the shape of individual ejection points cured individually and assisting with a subsequent elution step.

Fourthly, in some embodiments of the present application, the printing apparatus may control the softness and hardness of the liquid droplet of each ejection point by controlling the ultraviolet irradiation time of each different ejection point, so as to obtain a three-dimensional molded object with different softness and hardness.

Fifth, in some embodiments of the present application, by irradiating a part of the ejection points with ultraviolet light, the irradiated part is not eluted by the eluent because of curing, and the rest of the non-irradiated part is not cured and eluted by the eluent, thereby enabling micro-molding of a single ejection point. After the injection, irradiation and elution are circularly executed, the accumulation of a plurality of injection points which are subjected to micro-shaping can form a three-dimensional forming object with very high height and accurate shape, thereby overcoming the problem that the current OLED display dam has lower packaging height to cause ink overflow.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic layout of a printing apparatus in some embodiments of the present application.

Fig. 2 is a schematic view of a stereolithographic structure in some embodiments of the present application.

FIG. 3 is a schematic layout of another printing device in some embodiments of the present application.

FIG. 4 is a schematic layout of one of the printing devices in some embodiments of the present application.

FIG. 5 is a schematic view of one of the stereolithographic structures in some embodiments of the present application.

FIG. 6 is a schematic layout of another printing device in some embodiments of the present application.

FIG. 7 is a schematic layout of yet another printing device in some embodiments of the present application.

Fig. 8 is a schematic view of yet another stereolithography structure in some embodiments of the present application.

Fig. 9 is a schematic view of a stereolithography structure in some embodiments of the present application.

FIG. 10 is a schematic layout of yet another printing device in some embodiments of the present application.

FIG. 11 is a schematic layout of one of the printing devices in some embodiments of the present application.

FIG. 12 is a flow chart of a method of printing in some embodiments of the present application.

FIG. 13 is a schematic layout of one of the printing devices in some embodiments of the present application.

Fig. 14 is a schematic diagram of a display screen package structure in the prior art. Wherein, the Metal substrate 33(Metal Plate) is located at the lowest layer in the figure, the support Film 34(Backing Film) is located above the Metal substrate 33, and the OLED/TFT structure 35 is located above the support Film 34. The organic water-stop film 31 is formed by the IJP printing technique, and has a liquid level higher than the height of the frame 32.

Description of reference numerals:

the device comprises a printing device 1, a spraying device 2, an ultraviolet light excitation device 3, a substrate 4, a printing device 11, a spraying device 12, an ultraviolet light excitation device 13, a substrate 14, a printing device 21, a spraying device 22, an ultraviolet light excitation device 23, a substrate 24, an organic water-stop film 31, a frame 32, a metal substrate 33, a support film 34 and an OLED/TFT structure 35.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In this application, unless indicated to the contrary, use of the directional terms "upper" and "lower", if any, generally refer to upper and lower in the actual use or operation of the device, particularly in the orientation of the figures of the accompanying drawings; and "inner" and "outer" (if any) are with respect to the outline of the device.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The terms "first", "second", "third" and "fourth", etc., if any, in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "comprising" and "having" (if any) and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to the listed steps or modules but may alternatively include other steps or modules not listed or inherent to such process, method, article, or apparatus.

Some embodiments of the present application provide a printing apparatus that performs printing on a substrate using an ultraviolet curable resin as printing ink to form a three-dimensional molded object having a specific shape on the substrate.

In some embodiments of the present application, referring to fig. 1, the printing apparatus 1 includes at least an ejection device 2, an ultraviolet light excitation device 3, a control device (not shown in fig. 1), and the like.

Wherein the ejection device 2 includes a storage chamber that stores the ultraviolet curable resin and an ejection head that is in fluid communication with the storage chamber. The ejection head is disposed facing the substrate 4, and is configured to eject the ultraviolet-curable resin stored in the storage chamber onto the surface of the area to be sprayed in a drop-by-drop manner continuously in the form of individual droplets, such that each droplet forms an ejection dot and each ejection dot is spaced apart from another dot by a distance, and the area covered by all the ejection dots forms a piece of ejection print. The double-headed arrow in fig. 1 represents the moving direction of the injection device 2. The jetting device 2 moves in a direction parallel to the substrate 4, and when the jetting device moves a specific distance, a droplet is jetted onto the substrate 4, and the position of the droplet on the substrate is the jetting point corresponding to the droplet. The vertical arrows in fig. 1 represent the jetting direction of the jetting head of the jetting apparatus 2. When a droplet lands on a substrate, a semicircular droplet is formed due to interfacial tension. The distance between each injection point may be equal or different depending on the injection frequency of the injection device 2.

In some embodiments of the present application, the size of the single liquid droplet generated by the ejection head of the ejection device 2 is 5 μm to 5mm, and the ejection size of the ejection head can be specifically designed according to the size of the single liquid droplet required. In other embodiments of the present application, the size of the individual droplets generated by the ejection head of the ejection device 2 may be 200 μm to 2mm, or 500 μm to 1 mm. The size of the single droplet is merely an example, and the size of the single droplet may not be limited to the above range.

The ultraviolet light excitation device 3 can emit ultraviolet light, and applies ultraviolet light irradiation to the whole formed ejection print to cure the ultraviolet curing resin of each ejection point within the ultraviolet light irradiation range, thereby forming the curing point corresponding to each ejection point one to one. The irradiation range of the ultraviolet light needs to be equal to the coverage of the ejection print as long as it is ensured that each ejection point falls within the irradiation range of the ultraviolet light so as to enable each ejection point to be cured. By controlling the irradiation range of the ultraviolet light, it is possible to prevent the ultraviolet irradiation from burning other structures located outside the coverage of the jet print. Because the internal structure of the display device is precise and is easily damaged by ultraviolet light (UV), the damage of the ultraviolet light to the internal structure of the display device can be reduced by controlling the irradiation range of the ultraviolet light. In addition, because the ultraviolet light irradiation range of the ultraviolet light excitation device 3 can be controlled in a targeted manner, an ultraviolet light mask plate is not needed to be used for shielding the irradiation of ultraviolet light on the internal structure of the display device, and the workload of independently designing the mask plate with a specific shape and a specific size is also reduced. In order to control the irradiation range of the ultraviolet light, the ultraviolet light excitation device 3 needs to include a prism or a prism group, which can convert the ultraviolet light emitted by the ultraviolet light source therein into parallel ultraviolet light and irradiate the parallel ultraviolet light in the direction of the jet print, so that the damage effect of the ultraviolet light on other structures outside the coverage range of the jet print can be reduced. The dotted arrows in fig. 1 indicate the irradiation range of ultraviolet light. In other embodiments of the present application, a lens or a lens group may also be used to convert the ultraviolet light emitted from the ultraviolet light source into focused ultraviolet light, and the irradiation range of the focused ultraviolet light on the substrate is smaller than or equal to the coverage range of the jet print, so that the damage effect of the ultraviolet light on other structures outside the coverage range of the jet print can also be reduced.

In some embodiments of the present application, the wavelength of the ultraviolet light may be selected from any one of 300 to 400nm, 315 to 380nm, and 325 to 350 nm.

The control device is used for controlling the operations of the ejection device 2 and the ultraviolet excitation device 3. The control device may be configured to perform the following functions:

(1) after one of the injections of the injection device 2 is finished, the control device obtains the injection end information sent by the injection device 2 or input by people, and then starts the ultraviolet light excitation device 3 according to the injection end information. The ultraviolet excitation device 3 thus starts the irradiation of the entire jet print formed as described above, and stops the irradiation after the countdown timer in the ultraviolet excitation device 3 has ended or manually turns off the irradiation. Once the ultraviolet light excitation device 3 stops irradiating, no matter the ultraviolet light excitation device is automatically stopped or manually and actively stopped, the ultraviolet light excitation device 3 transmits an irradiation ending signal to the control device;

(2) after the ultraviolet light irradiation time of the ultraviolet light excitation device 3 is over, the ultraviolet light excitation device 3 automatically sends irradiation end information to the control device, the control device starts the injection device according to the irradiation end information, or manually sends the irradiation end information to the control device, and the control device starts the injection device 2 to perform next injection until the injection frequency of the injection device 2 is larger than a preset injection frequency threshold value. That is, the spraying device 2 accumulates the spraying times once every spraying, when the spraying times of the spraying device 2 is equal to the predetermined spraying times threshold, the step (2) is continued, the ultraviolet light excitation device 3 irradiates ultraviolet light, and after the ultraviolet light irradiation time is over, the control device does not start the next spraying device 2 again, because if the control device starts the next spraying device 2 again, the spraying times accumulated by the spraying device 2 after the spraying is greater than the predetermined spraying times threshold, the preset spraying stop condition is achieved, and the control device does not start the next spraying device 2 again. Thereby, the injection stop condition of the injection device 2 is controlled.

Through the processes, a plurality of cyclic actions are realized, and each cyclic action comprises one spraying process and one irradiation process. After a plurality of times of the above-mentioned cyclic actions, the accumulation of each molding layer is realized, and finally the three-dimensional molding structure is formed. Referring to fig. 2, through the above-mentioned cycle, the solidified layers (or molding layers) are stacked on the substrate 4 layer by layer, and the stacked solidified layers form a three-dimensional molding structure. Fig. 2 is a schematic view only, and in order to show the accumulation of each droplet in each corresponding molding layer, a gap exists between each droplet in fig. 2. In fact, since the liquid drops are liquid and have fluidity, when the upper layer of liquid drops are dropped into the lower layer of solidified structure, the gaps existing between the solidified structures are filled up, and thus the finally formed three-dimensional forming structure does not show the porous structure illustrated in fig. 2.

In the above embodiments, referring to fig. 1 or fig. 2, the spraying device 2 and the ultraviolet light excitation device 3 are located on the same side of the substrate 4 as the area to be sprayed, however, in other embodiments of the present application, the spraying device 2 and the ultraviolet light excitation device 3 may also be located on two sides of the area to be sprayed on the substrate 4, and the area to be sprayed on the substrate 4 allows ultraviolet light to penetrate through, so that the ultraviolet light can cure a single droplet on the area to be sprayed on the opposite side.

In some embodiments of the present application, the ultraviolet curable resin includes an ultraviolet curable epoxy resin or the like. The epoxy resin (EpoxyResin) can play a role of crosslinking (CrossLinkage) after being irradiated by ultraviolet light, can be rapidly converted into a solid state from a liquid state, the part which is already in the solid state cannot be washed away by eluent, and the part which is not irradiated by the ultraviolet light is still in the liquid state and can be eluted and removed by the eluent. Thus, in other embodiments, an elution process may be added after each irradiation process is completed.

The printing device provided by some embodiments of the application is suitable for large-area printing work, and can continuously spray a plurality of liquid drops at a certain frequency, each liquid drop can form a corresponding spraying point, and each spraying point is independently solidified by adopting large-range ultraviolet irradiation, and the layering forming of the three-dimensional forming object is realized through the circulating printing and irradiation process, so that the printing device of the embodiment can avoid the problem that the high-precision graphical three-dimensional structure cannot be obtained due to the simultaneous action of the self-fluidity and the self-gravity when UV printing glue is printed in a large quantity at one time. In addition, when large-area layered printing is carried out, all liquid drops can be uniformly irradiated by ultraviolet light due to small particle size, the curing degree is uniform, the elution process is not required to be increased, and a three-dimensional forming object with uniform density can be obtained. Of course, reference herein to the absence of an additional elution process is not meant to imply that elution is not possible at all, and may optionally be added. Therefore, the printing apparatus of the above-described embodiment is of the continuous ejection and multi-point curing type.

Some embodiments of this application increase punctiform UV laser source at shower nozzle side or glass board back, form the small radius focus through lens focus, through UV laser curing after printing, need not keep the part and do not pass through the solidification, and accessible organic solvent elution can ensure the printing precision, and the while is printed the resolidification through the stack behind the single-point curing, can form spatial structure, no longer restricts in the plane and prints. Therefore, the embodiments of the present application can improve the patterning precision of the UV glue printing, and simultaneously form the three-dimensional structure.

Exemplarily, UV laser can be added on the side of the inkjet nozzle, and laser forming is performed after printing is completed, and the part is not required to be eluted by organic solvent (such as alcohol, acetone and the like), so that forming precision can be improved due to the fact that laser controls the shape of the formed part; the three-dimensional structure can be formed by superposing, printing and curing after single-point curing. Or, the back surface of the glass back plate is added with UV laser (as shown in figure 3), and the glass back plate is formed by laser after printing is finished, so that the forming precision can be improved without partially eluting by an organic solvent. The precision of UV glue graphical printing can be improved, and a three-dimensional forming object structure can be formed. Therefore, the embodiments of the present application can be applied to UV glue printing and forming, such as barrier dam forming during organic ink printing of OLED film encapsulation, specific patterning forming during UV glue coating, and the like.

Some embodiments of the present application also provide a printing method, comprising:

(1) and continuously spraying the ultraviolet curing resin on the surface of an area to be sprayed dropwise in the shape of single liquid drops, wherein each liquid drop forms a spraying point and each spraying point is separated by a certain distance, and the area covered by all the spraying points forms a piece of spraying print.

(2) And applying ultraviolet light irradiation to the whole injection print to cure the ultraviolet curing resin of each injection point to form curing points corresponding to each injection point one by one, so that the irradiation range of the ultraviolet light is equal to the coverage range of the injection print. In this step, the purpose of making the irradiation range of the ultraviolet light equal to the coverage range of the jet print is to reduce the damage of the ultraviolet light to the precise structure inside the display device, so that the ultraviolet light is mainly used for curing.

(3) And (3) repeating or circularly performing the step (1) and the step (2) until the injection frequency of the injection device is greater than a preset injection frequency threshold value. If the number of times of injection of the injection device at this time is equal to the threshold value, the injection device still injects at this time, and step (2) is entered, and the number of times of injection of the injection device is greater than the threshold value at the next calculation, and then the injection device terminates the injection at this time. The number of times of spraying should be set to ensure that a three-dimensional molded object with a predetermined size can be formed after the above steps.

Some embodiments of the present application provide a printing apparatus that performs printing on a substrate using an ultraviolet curable resin as printing ink to form a three-dimensional molded object having a specific shape on the substrate. The printing device can be suitable for medium-area printing work and can generate three-dimensional molded objects with more precise structures. The printing device can continuously spray a plurality of liquid drops at a certain frequency, each liquid drop can form a corresponding spraying point, each spraying point is independently solidified by adopting independent ultraviolet irradiation, and the layered forming of the three-dimensional forming object is realized through a cyclic printing and irradiation process. Since the printing apparatus of this embodiment causes each ejection point to be cured individually, a three-dimensional molded object having a specific precise shape can be obtained by controlling the shape in which each ejection point is cured individually and assisting with the subsequent elution step. In addition, the printing equipment of the embodiment can also control the hardness of the liquid drop of each ejection point by controlling the ultraviolet irradiation time of each different ejection point, so that the three-dimensional molded object with different hardness can be obtained. Therefore, the printing apparatus of this embodiment is of a continuous ejection and single-dot curing type.

In some embodiments of the present application, referring to fig. 4, the printing apparatus 11 includes at least an ejection device 12, an ultraviolet light excitation device 13, an elution device, a control device (not shown in fig. 4), and the like.

Wherein the ejection device 12 includes a storage chamber that stores the ultraviolet curable resin and an ejection head that is in fluid communication with the storage chamber. The ejection head is disposed facing the substrate 14, and is configured to eject the ultraviolet-curable resin stored in the storage chamber onto the surface of the area to be sprayed in a drop-by-drop manner continuously in the form of individual droplets, such that each droplet forms an ejection dot and each ejection dot is spaced apart from another ejection dot by a distance, and the area covered by all the ejection dots forms a piece of ejection print. The distance between each injection point may be equal or different depending on the injection frequency of the injection device 12. In some embodiments of the present application, the size of the single liquid droplet generated by the ejection head of the ejection device 12 is 2mm to 35mm, and the ejection size of the ejection head can be specifically designed according to the size of the single liquid droplet required. In other embodiments of the present application, the size of the individual droplets produced by the jetting head of the jetting device 12 may be 5mm to 20mm, or 10mm to 15 mm. The size of the single droplet is merely an example, and the size of the single droplet may not be limited to the above range.

Since the printing apparatus 11 of this embodiment needs to cure each ejection point individually, the printing apparatus 11 includes a plurality of ultraviolet light excitation devices 13, and the number of the ultraviolet light excitation devices 13 is in one-to-one correspondence with the number of the ejection points to be ejected by the ejection devices 12, so that the ultraviolet light excitation devices 13 can be used to apply ultraviolet light irradiation to each ejection point in one-to-one correspondence, and the ultraviolet curing resin of each ejection point is cured individually to form a cured point in one-to-one correspondence with each ejection point. The irradiation range of the ultraviolet light emitted by each ultraviolet light excitation device 13 is smaller than or equal to the coverage range of each ejection point in one-to-one correspondence. The embodiment adopts single-point curing, namely, the irradiation range of ultraviolet light is controlled equivalently, so that other display structures outside the coverage range of the spraying points can not be burnt by the ultraviolet irradiation, and a mask plate is not needed to be used for shielding the irradiation of the ultraviolet light outside the coverage range of the spraying points. In addition, when the irradiation range of the ultraviolet light emitted by each ultraviolet light excitation device 13 is smaller than the coverage range of each ejection point corresponding to one-to-one, the single ejection point can be irradiated from different directions as required, so that the irradiation of the specific part is realized, the irradiated specific part is not eluted by the eluent because of solidification, and the rest parts which are not irradiated are not solidified and are eluted by the eluent, so that the micro-shaping of the single ejection point is realized (refer to fig. 5). After all actions (including injection, irradiation and elution) are finished, a three-dimensional forming object with an accurate shape can be formed by stacking a plurality of injection points which are subjected to micro-molding, and the printed three-dimensional forming object has high accuracy and can be adapted to accurate components in a display.

In some embodiments of the present application, the wavelength of the ultraviolet light may be selected from any one of 300 to 400nm, 315 to 380nm, and 325 to 350 nm.

And after the elution device forms one-to-one corresponding curing points at each injection point, the elution device elutes uncured parts in each injection point by using the elution liquid so that each curing point forms one-to-one corresponding forming points. The printing apparatus of this embodiment can also achieve micro-shaping of each ejection point by performing local irradiation and local curing of each ejection point in conjunction with a subsequent elution process, thereby obtaining a three-dimensional molded object having a different microstructure.

The control means is used to control at least the actions of the spraying means 12 and the uv excitation means 13 described above, and in some embodiments, the actions of the elution means may also be controlled. The control device may be configured to perform the following functions:

(1) after one of the injections of the injection device 12 is finished, the control device obtains the injection end information sent by the injection device 12 or manually input, and then starts the ultraviolet light excitation device 13 according to the injection end information; thereby, the ultraviolet excitation devices 13 start the single-point irradiation of the formed ejection point, and the irradiation is stopped after the countdown timer in the ultraviolet excitation device 13 finishes counting down or is manually turned off. Once the ultraviolet light excitation device 13 stops irradiating, no matter the ultraviolet light excitation device is automatically stopped or is manually and actively shut down, and the like, the ultraviolet light excitation device 13 transmits an irradiation end signal to the control device; in some embodiments, the control device can also control the irradiation time of each ultraviolet excitation device 13 individually, so as to control the hardness of the liquid drop at each ejection point by controlling the ultraviolet irradiation time at each different ejection point, thereby obtaining three-dimensional molded objects with different hardness.

(2) After the ultraviolet light irradiation time of the ultraviolet light excitation device 13 is finished, the ultraviolet light excitation device 13 automatically sends irradiation end information to the control device, the control device starts the elution device according to the irradiation end information, or manually sends the irradiation end information to the control device, and the control device starts the elution device according to the irradiation end information; and after the elution is finished, the control device obtains the injection starting information and starts the injection device according to the injection starting information to perform the next injection, and the injection device stops injecting until the injection frequency of the injection device is greater than a preset injection frequency threshold value. After the elution is completed, the elution device may send elution end information to the control device, and the control device may obtain the above-mentioned injection start information (or referred to as an injection start instruction) according to the elution end instruction.

Through the processes, a plurality of circulating actions are realized, and each circulating action comprises a spraying process, an irradiation process and an elution process. After a plurality of times of the above-mentioned cyclic actions, the accumulation of each molding layer is realized, and finally the three-dimensional molding structure is formed. Since one irradiation process is followed by one elution process, each molded layer can be subjected to one micro-molding while being eluted, so that the resulting three-dimensional molded structure can be formed into a fine structure in a predetermined form.

In the above embodiment, the spraying device 12 and the ultraviolet light excitation device 13 are located on the same side of the area to be sprayed on the substrate 14, however, in other embodiments of the present application, the spraying device 12 and the ultraviolet light excitation device 13 may be located on two sides of the area to be sprayed (see fig. 6), and the area to be sprayed on the substrate 14 allows ultraviolet light to penetrate through, so that the ultraviolet light can cure a single droplet on the area to be sprayed on the opposite side.

Some embodiments of the present application also provide a printing method, comprising:

(1) continuously spraying ultraviolet curing resin on the surface of an area to be sprayed dropwise in the shape of single liquid drops, so that each liquid drop forms a spraying point and each spraying point is separated by a certain distance;

(2) respectively applying ultraviolet light irradiation to each spraying point to cure the ultraviolet curing resin of each spraying point to form curing points corresponding to each spraying point one by one, wherein the irradiation range of the ultraviolet light emitted by each ultraviolet light excitation device is smaller than or equal to the coverage range of each spraying point corresponding one by one;

(3) eluting the uncured part in each injection point by using an eluent to ensure that each curing point forms a one-to-one corresponding forming point;

(4) and (4) repeating the steps (1) to (3) until the injection frequency of the injection device is greater than a preset injection frequency threshold value.

Some embodiments of the present application provide a printing apparatus that performs printing on a substrate using an ultraviolet curable resin as printing ink to form a three-dimensional molded object having a specific shape on the substrate. The printing device can be suitable for printing work with small micro area, and can generate three-dimensional forming objects with more precise structures. The printing apparatus is capable of ejecting the ultraviolet-curable resin in the shape of a single droplet such that only a single ejection point is formed at a time by the single droplet, and the single ejection point is individually cured using individual ultraviolet irradiation, then a three-dimensional molded object having a specific precise shape can be obtained by controlling the individually cured shape of each ejection point and assisting with a subsequent elution step. Therefore, the printing apparatus of this embodiment is of the single-dot ejection and single-dot curing type.

In some embodiments of the present application, as illustrated with reference to fig. 7, the printing apparatus 21 includes at least: a spraying device 22, an ultraviolet light excitation device 23, an elution device, a control device (not shown in fig. 7) and the like.

The ejection device 22 includes a storage chamber for storing the ultraviolet curable resin and an ejection head in fluid communication with the storage chamber. The ejection head is disposed toward the substrate 24 for ejecting the ultraviolet curable resin stored in the storage chamber onto the surface of the area to be sprayed in the shape of a single droplet so that the single droplet forms a single ejection point. The size of the individual droplets produced by the ejection head of the ejection device 22 may be 5mm to 5 cm. The ejection size of the ejection head can be specifically designed according to the size of a single droplet required. In other embodiments of the present application, the size of the individual droplets produced by the jetting head of the jetting device 22 may be 7mm to 2cm, or 10mm to 1 cm. The size of the single droplet is merely an example, and the size of the single droplet may not be limited to the above range. This embodiment employs micro-shaping of individual droplets, and therefore, the size of individual droplets can be larger.

The ultraviolet light excitation device 23 is configured to apply ultraviolet light irradiation to the single ejection point, so as to cure the ultraviolet curing resin located at the single ejection point, and form curing points corresponding to the single ejection point one by one, where an irradiation range of the ultraviolet light is smaller than or equal to a coverage range of the single ejection point corresponding to the single ejection point one by one (if the coverage ranges of the single ejection points ejected each time are different). When the irradiation range of the ultraviolet light is equal to the coverage of the single spray point, the single spray point achieves full curing without elution process. It is of course also possible to increase the elution process in order to wash away impurities on the surface of the solidification points. When the irradiation range of the ultraviolet light is smaller than the coverage of a single spray point, the elution process needs to be increased subsequently if the single spray point needs to be micro-shaped. Referring to fig. 8, after elution, the cured part of the single ejection point is not eluted by the eluent, and the non-irradiated part is eluted by the eluent because of non-curing, so that micro-shaping of the single ejection point is realized according to the irradiation range of the ultraviolet light. The irradiation range of the ultraviolet light can also be adjusted in combination with the irradiation angle of the ultraviolet light. After all actions (including injection, irradiation and elution) are completed, a three-dimensional molded object with a precise shape can be formed by stacking a plurality of injection points which are subjected to micro-molding (refer to fig. 9), and the three-dimensional shape of the printed three-dimensional molded object has high precision and a preset shape and can be adapted to precise components in a display.

In fig. 8 or fig. 9, the ultraviolet light excitation device 23 emits parallel ultraviolet light, which can be implemented by adding a prism or a prism group to the exit path of the ultraviolet light source, the irradiation range of the ultraviolet light on the single ejection point is controlled by controlling the emission range of the ultraviolet light source, however, in other embodiments of the present application, the converging of the uv light on the exit path of the uv light source may be achieved by a lens or a lens assembly to form a converging uv light, which forms a small radius focus on a single ejection point, the radius of the single spray point can be adjusted to be 20-60% of the radius of the single spray point, and the solidification time and the solidification degree of the partial area of the single spray point are controlled by moving the position of the small-radius focus at the single spray point, so that the micro-shaping of the single spray point is realized (as shown in figure 10). The oval shape in fig. 10 represents a lens or a lens group employed in the above-described embodiment. The various embodiments of the present application may be combined in any combination.

The elution device is used for eluting uncured parts in the single injection points by using an elution liquid after the single injection points form one-to-one corresponding curing points so as to enable the curing points to form one-to-one corresponding forming points. The kind of the eluting solution is not particularly limited as long as the uncured portion can be eluted.

The control means is adapted to control at least the actions of the spraying means 22 and the uv excitation means 23 as described above, and in some embodiments, the actions of the elution means. The control device may be configured to perform the following functions:

(1) after one of the injections of the injection device 22 is finished, the control device obtains injection end information sent by the injection device 22 or manually input, and starts the ultraviolet light excitation device 23 according to the injection end information; the uv excitation device 23 starts single-point irradiation of the single injection point formed as described above until a countdown timer in the uv excitation device 23 finishes counting down, and then stops irradiation or turns off irradiation thereof manually. Once the ultraviolet light excitation device 23 stops irradiating, no matter the ultraviolet light excitation device is automatically stopped or is manually and actively shut down, and the like, the ultraviolet light excitation device 23 transmits an irradiation end signal to the control device;

(2) after the ultraviolet light irradiation time of the ultraviolet light excitation device 23 is over, the ultraviolet light excitation device 23 automatically sends irradiation end information to the control device, the control device starts the elution device according to the irradiation end information, or manually sends the irradiation end information to the control device, and the control device starts the elution device according to the irradiation end information; and after the elution is finished, the control device obtains the injection starting information, and starts the injection device according to the injection starting information to perform the next injection, and the injection device stops injecting until the injection frequency of the injection device is greater than a preset injection frequency threshold value, so that the formed object is formed. After the elution is completed, the elution device may send elution end information to the control device, and the control device may obtain the above-mentioned injection start information (or referred to as an injection start instruction) according to the elution end instruction.

Through the processes, a plurality of circulating actions are realized, and each circulating action comprises a spraying process, an irradiation process and an elution process. After a plurality of times of the above-mentioned cyclic actions, the accumulation of each molding layer is realized, and finally the three-dimensional molding structure is formed. Since one irradiation process is followed by one elution process, each molded layer can be subjected to one micro-molding while being eluted, so that the resulting three-dimensional molded structure can be formed into a fine structure in a predetermined form.

In the above embodiments, the spraying device 22 and the ultraviolet light excitation device 23 are located on the same side of the area to be painted, however, in other embodiments of the present application, the spraying device and the ultraviolet light excitation device are located on both sides of the area to be painted (see fig. 11), and the area to be painted allows the ultraviolet light to penetrate.

Some embodiments of the present application also provide a printing method, comprising:

(1) spraying the ultraviolet curing resin on the surface of an area to be sprayed in the shape of a single liquid drop, so that the single liquid drop forms a single spraying point;

(2) applying ultraviolet irradiation to the single spraying points to cure the ultraviolet curing resin positioned at the single spraying points to form curing points corresponding to the single spraying points one by one, wherein the irradiation range of the ultraviolet is smaller than or equal to the coverage range of the single spraying points corresponding one by one;

(3) eluting uncured parts in the single injection points by using an eluent so as to enable the curing points to form one-to-one corresponding forming points;

(4) and (4) repeating the steps (1) to (3) until the injection frequency of the injection device is greater than a preset injection frequency threshold value.

In the above-described embodiment, the curing is performed once and the elution is performed once every formation of one ejection point, however, the curing and the elution may be performed entirely after the formation of a plurality of ejection points. As shown with reference to fig. 12. In fig. 12, the trapezoid represents a spray device, and the star represents an ultraviolet light excitation device. In fig. 12, two stacked ejection points are successively formed, and then the whole is irradiated with ultraviolet light and eluted as a whole. In fig. 12, the jetting means and the ultraviolet light excitation means are located on the same side of the substrate (indicated by a rectangle in fig. 12), however, they may also be located on both sides of the substrate (shown with reference to fig. 13).

The existing printing and forming technology in the display industry is to perform spraying and then cure the whole surface, and high-precision patterning cannot be realized due to the flowing of UV printing glue. In addition, in the prior art, a nozzle is generally adopted to eject dot-shaped ink drops, and a plurality of layers of ink drops are superposed to form a printing film, but the film lamination is influenced by gravity, so that a better three-dimensional structure cannot be formed. For example, an OLED display panel is generally packaged by a thin film, a dense organic water-proof film is formed on the panel body by IJP (Ink Jet printing) printing technology, and in order to prevent Ink overflow, a dam is generally formed around the panel body. In view of the above problems, the above embodiments of the present application can form a relatively narrow and high barrier dam having a desired height, which can be flush with the upper liquid level of the organic water-barrier film, thereby obtaining a good barrier effect and effectively preventing the overflow phenomenon of the organic water-barrier film.

The foregoing detailed description has described various embodiments of the present application, and the principles and implementations of the present application have been described herein using specific examples, which are provided only to assist in understanding the method and the core concepts of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (12)

1. A printing apparatus, characterized in that it comprises:

the spraying device is used for continuously spraying the ultraviolet curing resin on the surface of an area to be sprayed dropwise in the shape of single liquid drops, so that each liquid drop forms a spraying point, each spraying point is separated by a certain distance, and an area covered by all the spraying points forms a piece of spraying print;

the ultraviolet light excitation device is used for applying ultraviolet light irradiation to the whole injection print to cure the ultraviolet curing resin of each injection point to form curing points corresponding to the injection points one by one, and the irradiation range of the ultraviolet light is equal to the coverage range of the injection print; and

and the control device acquires the injection end information after one injection of the injection device is finished, starts the ultraviolet light excitation device according to the injection end information, acquires the irradiation end information after the ultraviolet light irradiation time of the ultraviolet light excitation device is finished, and starts the injection device according to the irradiation end information to perform the next injection until the injection frequency of the injection device is greater than a preset injection frequency threshold value.

2. The printing apparatus according to claim 1, wherein the jetting means is located on the same side of the area to be painted as the ultraviolet light excitation means; or,

the spraying device and the ultraviolet light excitation device are positioned on two sides of the area to be sprayed, and the area to be sprayed allows the ultraviolet light to penetrate through.

3. The printing apparatus of claim 1, wherein the wavelength of the ultraviolet light is selected from any one of values of 300 to 400 nm; and/or the presence of a gas in the gas,

the size of the single liquid drop generated by the ejection head of the ejection device is 5 μm to 5 mm.

4. A method of printing, comprising the steps of:

(1) continuously spraying ultraviolet curing resin on the surface of an area to be sprayed dropwise in the shape of single liquid drop, enabling each liquid drop to form a spraying point and enabling each spraying point to be separated by a certain distance, and enabling the area covered by all the spraying points to form a piece of spraying print;

(2) applying ultraviolet light irradiation to the whole injection print to cure the ultraviolet curing resin of each injection point to form curing points corresponding to the injection points one by one, so that the irradiation range of the ultraviolet light is equal to the coverage range of the injection print;

(3) and (3) repeating the step (1) and the step (2) until the injection times of the injection device are larger than a preset injection time threshold value.

5. A printing apparatus, characterized in that it comprises:

a spraying device which sprays ultraviolet curing resin on the surface of a region to be sprayed in a single drop shape continuously drop by drop, so that each drop forms a spraying point and each spraying point is separated by a certain distance;

the ultraviolet light excitation devices are used for respectively applying ultraviolet light irradiation to each spraying point to cure the ultraviolet curing resin of each spraying point so as to form curing points corresponding to each spraying point one by one, and the irradiation range of the ultraviolet light emitted by each ultraviolet light excitation device is smaller than or equal to the coverage range of each spraying point corresponding one by one;

the elution device is used for eluting the uncured part in each injection point by using an elution solution after each injection point forms a one-to-one corresponding curing point so as to enable each curing point to form a one-to-one corresponding forming point; and

the control device is used for obtaining the information of the end of the spraying after one of the spraying device is finished and starting the ultraviolet light excitation device according to the information of the end of the spraying; acquiring irradiation end information after the ultraviolet irradiation time of the ultraviolet light excitation device is ended, and starting the elution device according to the irradiation end information; and acquiring the information of starting injection after the elution is finished, and starting the injection device according to the information of starting injection to perform the next injection until the injection frequency of the injection device is greater than a preset injection frequency threshold value.

6. The printing apparatus of claim 5, wherein the jetting device is located on the same side of the area to be painted as the ultraviolet light excitation device; or,

the spraying device and the ultraviolet light excitation device are positioned on two sides of the area to be sprayed, and the area to be sprayed allows the ultraviolet light to penetrate through.

7. The printing apparatus of claim 5, wherein the size of a single droplet produced by the ejection head of the ejection device is 2mm to 35 mm; and/or the presence of a gas in the gas,

the number of the ultraviolet light excitation devices corresponds to the number of the spraying points one by one.

8. A method of printing, comprising the steps of:

(1) continuously spraying ultraviolet curing resin on the surface of an area to be sprayed dropwise in the shape of single liquid drops, so that each liquid drop forms a spraying point and each spraying point is separated by a certain distance;

(2) respectively applying ultraviolet light irradiation to each spraying point to cure the ultraviolet curing resin of each spraying point so as to form curing points corresponding to each spraying point one by one, wherein the irradiation range of the ultraviolet light emitted by each ultraviolet light excitation device is smaller than or equal to the coverage range of each spraying point corresponding to each spraying point one by one;

(3) eluting the uncured part in each injection point by using an eluent to form one-to-one corresponding forming points on each curing point;

(4) and (3) repeating the steps (1) to (3) until the injection frequency of the injection device is greater than a preset injection frequency threshold value.

9. A printing apparatus, characterized in that it comprises:

the spraying device sprays the ultraviolet curing resin on the surface of an area to be sprayed in the shape of single liquid drop so that the single liquid drop forms a single spraying point;

the ultraviolet light excitation device is used for applying ultraviolet light irradiation to the single spraying point to cure the ultraviolet curing resin positioned at the single spraying point to form curing points corresponding to the single spraying point one by one, and the irradiation range of the ultraviolet light is smaller than or equal to the coverage range of the single spraying point corresponding to one by one;

the elution device is used for eluting uncured parts in the single injection points by using an elution solution after the single injection points form one-to-one corresponding curing points so as to enable the curing points to form one-to-one corresponding forming points; and

the control device is used for obtaining the information of the end of the spraying after one of the spraying device is finished and starting the ultraviolet light excitation device according to the information of the end of the spraying; acquiring irradiation end information after the ultraviolet irradiation time of the ultraviolet light excitation device is ended, and starting the elution device according to the irradiation end information; and acquiring the information of starting injection after the elution is finished, and starting the injection device according to the information of starting injection to perform the next injection until the injection frequency of the injection device is greater than a preset injection frequency threshold value.

10. The printing apparatus of claim 9, wherein the jetting device is located on the same side of the area to be painted as the ultraviolet light excitation device; or,

the spraying device and the ultraviolet light excitation device are positioned on two sides of the area to be sprayed, and the area to be sprayed allows the ultraviolet light to penetrate through.

11. A printing apparatus according to claim 9, wherein the size of the individual droplets produced by the ejection heads of the ejection devices is from 5mm to 5 cm.

12. A method of printing, comprising the steps of:

(1) spraying the ultraviolet curing resin on the surface of an area to be sprayed in the shape of a single liquid drop, so that the single liquid drop forms a single spraying point;

(2) applying ultraviolet light irradiation to the single spraying point to cure the ultraviolet curing resin positioned at the single spraying point to form curing points corresponding to the single spraying point one by one, wherein the irradiation range of the ultraviolet light is smaller than or equal to the coverage range of the single spraying point corresponding to one by one;

(3) eluting uncured parts in the single injection points by using an eluent so as to enable the curing points to form one-to-one corresponding forming points;

(4) and (3) repeating the steps (1) to (3) until the injection frequency of the injection device is greater than a preset injection frequency threshold value.

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