UV curing ink-jet printing system

Abstract

The utility model relates to the technical field of ink-jet printing equipment, and discloses a UV curing ink-jet printing system, which comprises a substrate conveying line, an ink-jet pre-curing assembly, a reinforcing curing lamp and a shaping curing lamp, and is characterized in that the ink-jet pre-curing assembly comprises an ink-jet printing unit and a pre-curing unit; the ink-jet printing unit is used for depositing a printing layer on the surface of a substrate, the pre-curing unit is used for focusing pre-curing UV light to the printing layer and curing the surface of the printing layer before the printing layer diffuses outwards, and the pre-curing UV light gathered on the substrate and the projection of the ink-jet printing unit on the substrate are staggered; a printing layer is sequentially exposed under UV light of the pre-curing unit, the strengthening curing lamp and the shaping curing lamp. By adopting the UV curing ink-jet printing system, the curing effect of a printing layer can be improved, and meanwhile, the nozzle is prevented from being blocked.

Description

TECHNICAL FIELD

[0001] The utility model relates to inkjet printing equipment technical field especially relates to a kind of UV solidification inkjet printing system. BACKGROUND

[0002] UV inkjet printing technology combines printing technology with UV curing system, integrates the characteristics of inkjet printing technology, such as non-contact, simple operation, low cost, no solvent residue after UV curing, environmental protection, fast curing speed and high production efficiency, and is widely used in the preparation of solder mask layer in printed circuit board and other fields.

[0003] However, in addition to the UV curing lamp in the UV inkjet printing technology equipment will solidify the ink droplets sprayed, it will also affect the ink droplets in the nozzle, especially when the nozzle needs to be controlled to spray ink discontinuously during printing, the ink droplets in the nozzle are easy to dry, further clogging the nozzle, increasing the difficulty of cleaning the nozzle, and affecting the subsequent printing quality. UTILITY MODEL CONTENT

[0004] The technical problem to be solved by the utility model lies in providing a UV solidification inkjet printing system to improve the curing effect of the printing layer and avoid clogging the nozzle.

[0005] To solve the above technical problems, the utility model provides a UV solidification inkjet printing system, which comprises a substrate conveying line for conveying a substrate in a direction, and a inkjet pre-solidification assembly, a reinforcing curing lamp and a shaping curing lamp arranged in sequence along the substrate conveying direction,

[0006] The inkjet pre-solidification assembly comprises a corresponding inkjet printing unit and a pre-curing unit, the inkjet printing unit is arranged at the front end corresponding to the pre-curing unit, the inkjet printing unit is used for depositing a printing layer on the surface of the substrate, the pre-curing unit is used for focusing pre-solidification UV light on the printing layer and curing the surface of the printing layer before the printing layer spreads outward, and the projection of the pre-solidification UV light gathered on the substrate and the inkjet printing unit on the substrate is staggered.

[0007] The printing layer is sequentially exposed to the UV light of the pre-curing unit, the reinforcing curing lamp and the shaping curing lamp.

[0008] As an improvement of the above scheme, in the UV light projected by the reinforcing curing lamp to the substrate conveying line, at least 75% of the radiant flux is concentrated in the position directly below the reinforcing curing lamp and the direction away from the inkjet pre-solidification assembly of the reinforcing curing lamp, and the light power of at least one of the reinforcing curing lamp and the shaping curing lamp is greater than the light power of the pre-curing unit.

[0009] As an improvement of the above-mentioned scheme, the substrate conveying line comprises an in-feed conveying belt, an out-feed conveying belt, and a transfer platform driven to reciprocate along the first guide rail between the in-feed conveying belt and the out-feed conveying belt, the inkjet pre-fixing assembly and the reinforcing curing lamp are arranged above the moving path of the transfer platform.

[0010] As an improvement of the above-mentioned scheme, the top surface of the transfer platform is provided with vacuum suction holes and grooves for accommodating the in-feed conveying belt and the out-feed conveying belt;

[0011] The substrate suctioned by the top surface of the transfer platform forms a through hole with the groove, when the transfer platform moves to the out-feed conveying belt extending into the through hole, the transfer platform releases the substrate and descends along the second guide rail to contact the substrate with the out-feed conveying belt.

[0012] As an improvement of the above-mentioned scheme, the inkjet pre-fixing assembly comprises a first inkjet printing unit and a second inkjet printing unit arranged along the substrate conveying direction, the first inkjet printing unit is arranged in at least two, the projection of the second inkjet printing unit and the adjacent two first inkjet printing units in the substrate conveying direction are coincident, the first pre-fixing unit corresponding to each first inkjet printing unit is arranged between the first inkjet printing unit and the second inkjet printing unit, and the opposite sides of the second pre-fixing unit corresponding to the first inkjet printing unit are adjacent to the second inkjet printing unit and the reinforcing curing lamp respectively.

[0013] As an improvement of the above-mentioned scheme, the UV light of the reinforcing curing lamp is emitted in a direction away from the second pre-fixing unit, and the light power of the first pre-fixing unit is greater than that of the second pre-fixing unit.

[0014] As an improvement of the above-mentioned scheme, the pre-fixing UV light is linear curing light extending in a direction perpendicular to the substrate conveying direction, or dot array curing light arrayed in a direction perpendicular to the substrate conveying direction.

[0015] As an improvement of the above-mentioned scheme, the pre-fixing unit comprises a light source assembly and a light shield, the light shield is provided with a light outlet groove opening downward, the light outlet groove extends in a direction perpendicular to the substrate conveying direction, the light source assembly is arranged in the light outlet groove, and a first preset distance is arranged between the light source assembly and the opening of the light outlet groove.

[0016] As an improvement of the above-mentioned scheme, the light source assembly comprises a point light source arranged in an array, and a convex mirror arranged corresponding to the point light source, the convex mirror is used to concentrate and project the light emitted by the point light source on the substrate.

[0017] As an improvement of the above-mentioned scheme, the distance between the reinforcing curing lamp and the shaping curing lamp is greater than the distance between the reinforcing curing lamp and the inkjet pre-fixing assembly, and the irradiation range of the reinforcing curing lamp and the irradiation range of the shaping curing lamp are provided with a second preset distance.

[0018] As an improvement of the above-mentioned scheme, the shaping and curing lamp is arranged in at least two, and a third preset distance is arranged between two adjacent shaping and curing lamps.

[0019] As an improvement of the above-mentioned scheme, the top of the shaping and curing lamp is covered with an exhaust hood, and an exhaust fan is arranged in the exhaust hood.

[0020] The utility model discloses, have the following beneficial effect:

[0021] The utility model discloses a kind of UV solidification inkjet printing systems, by sequentially setting the inkjet pre-solidification component, the strengthening curing lamp and the shaping and curing lamp along the substrate conveying direction, after the substrate passes the inkjet printing unit of the inkjet pre-solidification component and forms printing layer, before printing layer diffuses outward, its surface is cured by the pre-solidification unit and is gathered on substrate UV light, since the UV light of the pre-solidification unit is focused on printing layer, on the one hand, printing layer on substrate is forwarded in the conveying process of substrate conveying line, and the energy intensity of pre-solidification UV light received is greater, can more rapidly solidify printing layer surface, reduce the possibility that printing layer diffuses outward or collapses, printing quality is promoted, on the other hand, pre-solidification UV light gathered on substrate is staggered with the projection of the inkjet printing unit on substrate, and pre-solidification UV light entering the inkjet printing unit work nozzle by scattering and reflection is reduced;

[0022] In addition, printing layer is further exposed to the UV light of the strengthening curing lamp and the shaping and curing lamp, and gradually solidifies from outside to inside, and on the basis of surface rapid solidification, solidification depth gradually increases, to realize deep effective solidification.

[0023] Meanwhile, at least 75% of the radiant flux of the UV light projected to the substrate conveying line by the strengthening curing lamp is concentrated on the position directly below the strengthening curing lamp and the direction away from the inkjet pre-solidification component, and the light power of at least one of the strengthening curing lamp and the shaping and curing lamp is greater than the light power of the pre-solidification unit, on the one hand, the energy intensity of the UV light emitted by the strengthening curing lamp is greater on the side close to the inkjet pre-solidification component, and the surface solidification effect of the printing layer of the substrate entering the projection area of the strengthening curing lamp is immediately consolidated, the hardness increases, and the solidification depth gradually deepens, on the other hand, the influence of the UV light emitted by the strengthening curing lamp on the nozzle in the inkjet printing unit is reduced.

[0024] Therefore, the UV solidification inkjet printing system improves the solidification effect of printing layer, while avoiding clogging nozzle, and can help to improve printing quality. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1is an embodiment structure schematic view of the UV curing inkjet printing system;

[0026] Figure 2 is Figure 1 a side view;

[0027] Figure 3 is an embodiment structure schematic view of the inkjet pre-curing assembly;

[0028] Figure 4 is a structure schematic view of the substrate conveying line;

[0029] Figure 5 is another embodiment structure schematic view of the inkjet pre-curing assembly. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model will be described further in detail below in combination with the drawings.

[0031] As Figure 1 and Figure 2 shown, the utility model discloses a kind of UV curing inkjet printing system's embodiment, including the substrate conveying line for directional conveying substrate, and the inkjet pre-curing assembly 2, the reinforcing curing lamp 3 and the shaping curing lamp 4 sequentially arranged along substrate conveying direction.

[0032] Wherein, as Figure 3 shown, the inkjet pre-curing assembly 2 includes the inkjet printing unit 21 and the pre-curing unit 22 corresponding arrangement, the inkjet printing unit 21 is set in the front end corresponding the pre-curing unit 22, the inkjet printing unit 21 is used to deposit printing layer on substrate surface, the pre-curing unit 22 is used to focus pre-curing UV light to printing layer, and printing layer surface is cured before printing layer outward diffusion, pre-curing UV light gathered on substrate and the projection of the inkjet printing unit 21 on substrate are staggered;Printing layer is sequentially exposed under the UV light of the pre-curing unit 22, the reinforcing curing lamp 3 and the shaping curing lamp 4.

[0033] The embodiment sets the inkjet pre-curing assembly 2, the strengthening curing lamp 3 and the shaping curing lamp 4 in sequence along the substrate conveying direction. After the substrate passes through the inkjet printing unit 21 of the inkjet pre-curing assembly 2 to form a printing layer, the surface of the printing layer is cured by the pre-curing UV light of the pre-curing unit 22 before the printing layer spreads outward. Since the UV light of the pre-curing unit 22 is focused on the printing layer, on the one hand, the printing layer on the substrate can be cured more rapidly by the greater energy intensity of the pre-curing UV light during the forward conveying of the substrate along the substrate conveying line, and the possibility of spreading or collapsing of the printing layer outward is reduced, so that the printing quality is improved. On the other hand, the pre-curing UV light focused on the substrate is offset from the projection of the inkjet printing unit 21 on the substrate, so that the pre-curing UV light scattered or reflected into the working nozzle of the inkjet printing unit 21 is reduced. In addition, the printing layer is further exposed to the UV light of the strengthening curing lamp 3 and the shaping curing lamp 4, and is gradually cured from the outside to the inside, so that the curing depth is gradually increased on the basis of the rapid curing of the surface, and the deep effective curing is realized.

[0034] Preferably, the UV light projected by the strengthening curing lamp 3 to the substrate conveying line has at least 75% of the radiant flux concentrated in the direction directly below the strengthening curing lamp 3 and away from the inkjet pre-curing assembly 2, and the light power of at least one of the strengthening curing lamp 3 and the shaping curing lamp 4 is greater than the light power of the pre-curing unit 22. On the one hand, the energy intensity of the UV light emitted by the strengthening curing lamp 3 is greater on the side close to the inkjet pre-curing assembly 2, so that the surface curing effect of the printing layer of the substrate entering the projection area of the strengthening curing lamp 3 is immediately consolidated, the hardness is increased, and the curing depth is gradually deepened. On the other hand, the influence of the UV light emitted by the strengthening curing lamp 3 on the nozzles of the inkjet printing unit 21 is reduced. Therefore, the UV curing inkjet printing system improves the curing effect of the printing layer, avoids clogging the nozzles, and helps to improve the printing quality.

[0035] It should be noted that the UV light of the strengthening curing lamp projected to the substrate conveying line has at least 75% of the radiant flux concentrated in the direction directly below the strengthening curing lamp and away from the inkjet pre-curing assembly. This means that, in a unit of time, the substrate conveying line receives the UV light power in the form of radiation, and the UV light power received in the direction directly below the strengthening curing lamp and away from the inkjet pre-curing assembly accounts for more than 75%. Only less than 25% of the UV light power received by the substrate conveying line is in the direction close to the inkjet pre-curing assembly, so as to reduce the influence of the UV light emitted by the strengthening curing lamp 3 on the nozzles of the inkjet printing unit 21.

[0036] Preferably, the substrate conveying line of the present embodiment comprises an infeed conveying belt 11, an outfeed conveying belt 12, and a transfer platform 13 driven by a screw rod driving mechanism to reciprocate along the first guide rail between the infeed conveying belt 11 and the outfeed conveying belt 12. In the present embodiment, the inkjet pre-curing assembly 2 and the reinforcing curing lamp 3 are arranged above the moving path of the transfer platform 13, and the shaping curing lamp 4 is arranged above the outfeed conveying belt 12, i.e. the substrate is subjected to the irradiation of the reinforcing curing lamp 3 after the transfer platform 13 completes the deposition of the printed layer and the pre-curing, and the substrate is continuously subjected to the irradiation of the reinforcing curing lamp 3 and the shaping curing lamp 4 on the outfeed conveying belt 12.

[0037] Since the transfer platform 13 is driven by the first screw rod driving mechanism (not shown in the figure) and guided horizontally by the first guide rail (not shown in the figure), the substrate runs more smoothly on the transfer platform 13, and the initial formation of the printed layer on the substrate and the curing of the surface of the printed layer are both free from oscillation, which helps to avoid the oscillation diffusion of the printed layer and improve the surface flatness of the cured printed layer.

[0038] Similarly, the transfer platform 13 is driven by the second screw rod driving mechanism 14 and guided vertically by the second guide rail (not shown in the figure), so that the substrate runs smoothly on the transfer platform 13.

[0039] Specifically, as shown in Figure 4 , the top surface of the transfer platform 13 is provided with vacuum suction holes 131 for adsorbing the substrate, so that the substrate runs smoothly on the transfer platform 13.

[0040] In addition, the top surface of the transfer platform 13 is also provided with a groove 132 for accommodating the infeed conveying belt 11 and the outfeed conveying belt 12. The infeed conveying belt 11 conveys the substrate to above the transfer platform 13, and the transfer platform 13 is raised and adsorbs the substrate. The substrate adsorbed on the top surface of the transfer platform 13 forms a through hole with the groove 132, and when the transfer platform 13 moves to the outfeed conveying belt 12 extending into the through hole, the transfer platform 13 releases the substrate and is driven by the second screw rod driving mechanism 14 to descend along the second guide rail (not shown in the figure) until the substrate contacts the outfeed conveying belt 12. In this way, the substrate is conveyed smoothly between the infeed conveying belt 11 and the transfer platform 13, and between the transfer platform 13 and the outfeed conveying belt 12, avoiding the oscillation of the printed layer during transmission.

[0041] Preferably, the present embodiment is provided with two groups of transfer platforms 13 between the infeed conveying belt 11 and the outfeed conveying belt 12, and the two groups of transfer platforms 13 are respectively connected to the opposite sides of the mounting beam in a sliding manner. By staggering the two groups of transfer platforms 13 in the height direction, the two groups of transfer platforms 13 can reciprocate between the infeed conveying belt 11 and the outfeed conveying belt 12 without interfering with each other, so as to improve the operation efficiency.

[0042] The embodiment further provides a cleaning platform 5 between the feeding conveying belt 11 and the discharging conveying belt 12 for cleaning the inkjet printing unit 21 and the nozzle. The inkjet pre-curing assembly 2 can move horizontally and vertically between the moving platform 13 and the cleaning platform 5. The horizontal moving direction of the inkjet pre-curing assembly 2 is perpendicular to the conveying direction of the substrate.

[0043] Specifically, as Figure 5 the inkjet pre-curing assembly 2 comprises a first inkjet printing unit 21a and a second inkjet printing unit 21b arranged along the conveying direction of the substrate. The first inkjet printing unit 21a is arranged in parallel and comprises at least two units. The second inkjet printing unit 21b is arranged adjacent to the projection of the two first inkjet printing units 21a in the conveying direction of the substrate, so as to realize a larger printing width. The first pre-curing unit 22a corresponding to each first inkjet printing unit 21a is arranged between the first inkjet printing unit 21a and the second inkjet printing unit 21b. The second pre-curing unit 22b corresponding to the first inkjet printing unit 21a is arranged adjacent to the second inkjet printing unit 21b and the strengthening curing lamp 3 on opposite sides, so as to pre-cure the printed layer in time after the printing. In the embodiment, the first inkjet printing unit 21a is arranged in front of the second inkjet printing unit 21b, and the UV light of the strengthening curing lamp 3 is emitted in a direction away from the second pre-curing unit 22b, so as to reduce the overall influence of the strengthening curing lamp 3 on the inkjet pre-curing assembly 2.

[0044] In the embodiment, the light power of the strengthening curing lamp 3 is greater than the light power of the pre-curing unit 22, and the light power of the shaping curing lamp 4 is greater than the light power of the strengthening curing lamp 3, so as to gradually increase the curing depth of the printed layer. Meanwhile, the light power of the first pre-curing unit 22a is greater than the light power of the second pre-curing unit 22b, so as to make the overall curing energy received by the position of the printed layer below the first pre-curing unit 22a close to the position of the printed layer below the second pre-curing unit 22b.

[0045] The printed layer formed on the substrate comprises a surface layer, an intermediate layer and an inner layer. The pre-curing unit 22 is used for curing the surface layer of the printed layer, the strengthening curing lamp 3 is used for curing the intermediate layer of the printed layer, and the shaping curing lamp 4 is used for curing the inner layer of the printed layer. The thickness ratio of the surface layer, the intermediate layer and the inner layer is 1:(1-1.75):(1-1.75). The UV light emitted by the pre-curing unit 22, the strengthening curing lamp 3 and the shaping curing lamp 4 has a wavelength range of 320-405 nm.

[0046] The pre-curing unit 22 of the inkjet pre-curing assembly 2 specifically comprises a light source assembly 221 and a light shield 222, the light shield 222 is provided with a light outlet groove 223 which is downwardly open and extends in a direction perpendicular to the substrate conveying direction, and the light source assembly 221 is arranged in the light outlet groove 223 and is provided with a first preset distance from the opening of the light outlet groove 223 to reduce the influence of light scattering on the ink droplets in the nozzle of the inkjet printing unit 21.

[0047] The pre-curing unit 22 focuses the pre-curing UV light on the printed layer of the substrate, which is linear curing light extending in a direction perpendicular to the substrate conveying direction, or dot array curing light arrayed in a direction perpendicular to the substrate conveying direction. The UV lamp irradiation length of the pre-curing unit 22 corresponds to the working length of each inkjet printing unit 21, and the irradiation surface is small and the energy is small, which is concentrated in a small area by the convex mirror c.

[0048] In the embodiment, the light source assembly 221 comprises point light sources arranged in an array, and convex mirrors c corresponding to the point light sources, the convex mirrors c are used to project the light emitted by the point light sources on the substrate. The UV lamp irradiation length of the pre-curing unit 22 corresponds to the working length of each inkjet printing unit 21, and the inkjet printing unit 21 is provided with nozzles arranged in an array, the nozzles are arranged corresponding to the point light sources, and the dot array printing is uniformly cured.

[0049] The reinforcing curing lamp 3 is used for the second curing of the printed layer in the embodiment, and the energy is stronger than that of the inkjet pre-curing assembly 2, which is used for the molding of the printed layer, and the light emitting surface of the reinforcing curing lamp 3 is inclined to the shaping curing lamp 4, and the inclination angle between the light emitting surface of the reinforcing curing lamp 3 and the horizontal plane is 3-40°. At the same time, the distance between the reinforcing curing lamp 3 and the shaping curing lamp 4 is 2-4 times the distance between the reinforcing curing lamp 3 and the inkjet pre-curing assembly 2, so that at least 75% of the UV light projected by the reinforcing curing lamp 3 on the substrate conveying line is concentrated on the position directly below the reinforcing curing lamp 3 and the direction away from the inkjet pre-curing assembly 2.

[0050] The irradiation surface of the reinforcing curing lamp 3 and the irradiation surface of the shaping curing lamp 4 are provided with a second preset distance, the shaping curing lamps 4 are arranged in at least two, and a third preset distance is provided between the adjacent two shaping curing lamps 4 to realize the step curing reaction.

[0051] Since the shaping curing lamp 4 is used for the third curing of the printed layer, the energy is the strongest, which is used for the final curing and molding of the printed layer. In the embodiment, an exhaust hood 6 is preferably covered on the top of the shaping curing lamp 4, and an exhaust duct in communication with the exhaust hood 6 is arranged, and an exhaust fan is arranged in the exhaust duct to exhaust the free organic matter generated in the high-temperature curing environment.

[0052] The existing printing device is easy to cause the nozzle hole to be blocked when performing ink-jet printing on the BC isolation glue, because the nozzle is close to the curing lamp, and the curing lamp affects the nozzle at a close distance.

[0053] The utility model discloses a different energy UV lamp is carried out primary solidification, secondary solidification and tertiary solidification, controls the solidification time and energy of ink drop, realizes the ladder type solidification, reduces the influence of curing lamp to nozzle, has reduced nozzle cleaning difficulty, improved the service life of nozzle.

[0054] The above disclosed is only a preferred embodiment of the utility model, and of course cannot limit the right scope of the utility model, therefore, equivalent changes made according to the utility model claim still belong to the range covered by the utility model.

Claims

1. A UV-curable inkjet printing system, characterized by, The substrate conveying line comprises a substrate conveying line for conveying the substrate in a direction, and an inkjet pre-curing assembly, a strengthening curing lamp and a shaping curing lamp arranged in sequence along the substrate conveying direction, The inkjet pre-curing assembly comprises a corresponding inkjet printing unit and a pre-curing unit, the inkjet printing unit is arranged at the front end of the pre-curing unit, the inkjet printing unit is used for depositing a printing layer on the surface of the substrate, and the pre-curing unit is used for focusing pre-curing UV light on the printing layer and curing the surface of the printing layer before the printing layer spreads outward, the pre-curing UV light focused on the substrate is offset from the projection of the inkjet printing unit on the substrate; The printing layer is sequentially exposed to the UV light of the pre-curing unit, the strengthening curing lamp and the shaping curing lamp.

2. The UV-curable inkjet printing system of claim 1, wherein, The UV light projected by the strengthening curing lamp to the substrate conveying line is concentrated at least 75% of the radiant flux directly below the strengthening curing lamp and in the direction away from the inkjet pre-curing assembly, and the light power of at least one of the strengthening curing lamp and the shaping curing lamp is greater than the light power of the pre-curing unit.

3. The UV-curable inkjet printing system of claim 1, wherein, The substrate conveying line comprises an input conveying belt, an output conveying belt, and a transfer platform driven to move back and forth along a first guide rail between the input conveying belt and the output conveying belt, the inkjet pre-curing assembly and the strengthening curing lamp are arranged above the moving path of the transfer platform.

4. The UV-curable inkjet printing system of claim 3, wherein, The top surface of the transfer platform is provided with vacuum suction holes and grooves for accommodating the input conveying belt and the output conveying belt; The substrate suctioned on the top surface of the transfer platform forms a through hole with the grooves, when the transfer platform moves to the output conveying belt extending into the through hole, the transfer platform releases the substrate and descends along a second guide rail to contact the substrate with the output conveying belt.

5. The UV-curable inkjet printing system of claim 1, wherein The inkjet pre-curing assembly comprises a first inkjet printing unit and a second inkjet printing unit arranged in the substrate conveying direction, the first inkjet printing unit is arranged in at least two, the projection of the second inkjet printing unit in the substrate conveying direction coincides with the projection of the adjacent two first inkjet printing units, a first pre-curing unit corresponding to each first inkjet printing unit is arranged between the first inkjet printing unit and the second inkjet printing unit, and the second pre-curing unit corresponding to the first inkjet printing unit is arranged adjacent to the second inkjet printing unit and the strengthening curing lamp on opposite sides.

6. The UV-curable inkjet printing system of claim 5, wherein, The UV light of the strengthening curing lamp is emitted in the direction away from the second pre-curing unit, and the light power of the first pre-curing unit is greater than that of the second pre-curing unit.

7. The UV-curable inkjet printing system according to any one of claims 1 to 6, wherein The pre-curing UV light is linear curing light extending in the direction perpendicular to the substrate conveying direction, or dot array curing light arranged in the direction perpendicular to the substrate conveying direction.

8. The UV-curable inkjet printing system of claim 1, wherein The pre-curing unit comprises a light source assembly and a light shield, the light shield is provided with a light outlet groove opening downward, the light outlet groove extends in the direction perpendicular to the substrate conveying direction, the light source assembly is arranged in the light outlet groove, and a first preset distance is arranged between the light source assembly and the opening of the light outlet groove.

9. The UV-curable inkjet printing system of claim 8, wherein, The light source assembly comprises point light sources arranged in an array, and convex mirrors arranged correspondingly to the point light sources, the convex mirrors being used for concentrating and projecting light emitted by the point light sources on a substrate.

10. The UV-curable inkjet printing system of claim 1, wherein The distance between the strengthening curing lamp and the shaping curing lamp is greater than the distance between the strengthening curing lamp and the inkjet pre-curing assembly, and the irradiation range of the strengthening curing lamp and the irradiation range of the shaping curing lamp are provided with a second preset distance.

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