JP2015202689A - Method and apparatus for production of three-dimensional molded object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form an ink layer capable of preventing occurrence of unevenness of the thickness due to application of a pressure.SOLUTION: A production method of a three-dimensional molded object includes an ink discharge step of discharging an ink which is hardenable by irradiation with light from at least one nozzle row, among a plurality of nozzle rows 10 composed of a plurality of nozzles 1 provided along a second direction intersecting a first direction of scanning of an inkjet head 30, to form an ink layer 50 and a UV irradiation step of irradiating the ink layer 50 with light, after the formation of the ink layer 50 in the ink discharge step, to harden the ink layer 50.

Description

  The present invention relates to a method for manufacturing a three-dimensional structure and a manufacturing apparatus for a three-dimensional structure.

  As a technique for modeling a three-dimensional solid object, in addition to a sheet lamination method as described in Patent Document 1, a melt deposition method (FDM: Fused Deposition Molding), an inkjet method, an inkjet binder method, and an optical modeling method (SL: Stereo Lithography), powder sintering method (SLS: Selective Laser Sintering), etc. are known.

  In particular, as an ink jet method, a method of laminating a mask pattern by spraying an ultraviolet curable resin with a 3D printer is frequently used. In this method, the design and mechanism of the appearance and appearance of the final product is converted into data using 3D CAD, and then the data is sliced by a computer and multilayer mask pattern data is created by superimposing thin plates, and UV curing is performed. A three-dimensional object is manufactured by jetting and laminating a functional resin from a head in accordance with mask pattern data.

JP 2003-71530 A (published March 11, 2003)

  In manufacturing a three-dimensional structure by the inkjet method, one ink layer constituting the three-dimensional structure is formed by a multi-pass method, and the three-dimensional structure is manufactured by stacking the ink layers.

  When the ink layer is cured by irradiating ultraviolet rays while the inkjet head is scanned by the multi-pass method to discharge the ultraviolet curable ink, the hardness of each ink layer varies. Found out that it would occur.

  The variation in hardness that occurs in one ink layer occurs as shown in FIGS. In the multi-pass method, ink 60 made of ultraviolet curable ink is ejected in the first scanning of the inkjet head, and the ink 60 is irradiated with ultraviolet rays (FIG. 4A). Subsequently, the ink 60 ′ is ejected onto the ink 60 in the second scanning of the ink jet head, and ultraviolet irradiation is performed. Thereafter, the ink 60 ″ is ejected onto the ink 60 ′ and irradiated with ultraviolet rays (FIG. 4B). In other words, the ink 60 is irradiated with ultraviolet rays three times, and the ink 60 ″ is only once. It is irradiated with ultraviolet rays. For this reason, the ink 60, 60 ', and 60 "vary in hardness.

  For this reason, when pressure is applied by a roller or the like to flatten the inks 60, 60 ′, and 60 ″ in a later process, the ink 60, 60 ′, and 60 ″ are formed due to the difference in hardness. Ink layer 60 (2) is uneven in thickness ((c) in FIG. 4). Therefore, the ink layer 60 cannot be made to have a uniform thickness, and there is a problem that distortion occurs when a three-dimensional structure is manufactured.

  That is, the present invention has been made in view of the above problems, and provides a method for manufacturing a three-dimensional structure that can form an ink layer that can prevent the occurrence of uneven thickness when pressure is applied. It is to provide.

  In order to solve the above problems, a method for manufacturing a three-dimensional structure according to the present invention is a method for manufacturing a three-dimensional structure for forming a three-dimensional structure by laminating ink layers, and an inkjet head. Ejecting ink that is cured by light irradiation from at least one nozzle row among a plurality of nozzle rows comprising a plurality of nozzles provided along a second direction intersecting the first direction. An ink ejection process for forming one ink layer; and an ultraviolet irradiation process for curing one ink layer by irradiating light after forming the one ink layer in the ink ejection process. It is characterized by inclusion.

  According to the above configuration, after the ink necessary for forming the ink layer is ejected, the ink layer can be irradiated with ultraviolet rays under the same conditions. For this reason, the ink layer can be uniformly cured. Accordingly, it is possible to form an ink layer that can prevent the occurrence of uneven thickness of the ink layer by applying pressure. That is, an ink layer suitable for manufacturing a three-dimensional structure can be formed.

  In one aspect of the method for producing a three-dimensional structure according to the present invention, in the ink ejection step, the plurality of nozzle rows are arranged so that the locus of the nozzles moving in the first direction does not overlap each other. The ink is ejected.

  According to the above configuration, the resolution of the ink layer formed by one scan of the inkjet head can be increased. For this reason, the frequency | count of the scanning of the inkjet head required in order to form one ink layer can be decreased.

  In one aspect of the method for producing a three-dimensional structure according to the present invention, in addition to the above-described configuration, in the ink discharge step, the ink jet head is scanned while discharging the ink from the nozzle row, thereby performing one time. The one ink layer is formed by scanning.

  According to the above configuration, since one ink layer is formed by one scan of the ink jet head, an ink layer having a uniform hardness can be formed by one ultraviolet irradiation.

  In one aspect of the method for producing a three-dimensional structure according to the present invention, in the ink ejection step, the ink jet head is scanned while ejecting the ink from one nozzle row, and a plurality of scans are performed. One ink layer may be formed.

  According to the above configuration, ultraviolet rays can be irradiated after one ink layer is formed by causing an inkjet head having one nozzle row to scan a plurality of times. For this reason, the ink layer can be uniformly cured. Therefore, it is possible to form an ink layer that can prevent unevenness in thickness due to application of pressure, and it is possible to form an ink layer suitable for manufacturing a three-dimensional structure.

  One aspect of the method for producing a three-dimensional structure according to the present invention includes, in addition to the above configuration, a flattening step of flattening the one ink layer by a pressurizing unit after the ultraviolet irradiation step.

  According to the above configuration, it is possible to form a flat ink layer having no thickness unevenness by applying pressure to the ink layer having a uniform hardness.

  One aspect of the three-dimensional structure manufacturing apparatus according to the present invention includes an inkjet head that scans over an ink layer, and a plurality of nozzles that are provided along a second direction that intersects the first direction that the inkjet head scans. The nozzle trajectory of a nozzle row that moves in the first direction and the nozzle trajectory of another nozzle row that moves in the first direction. Are arranged so that they do not overlap with each other.

  According to the said structure, the resolution of the ink layer which an inkjet head can discharge by one scan can be made high. In addition, an ink layer having a uniform hardness can be formed. That is, the manufacturing method of the three-dimensional structure according to the present invention can be suitably implemented.

  The three-dimensional structure manufacturing apparatus according to the present invention includes a pressurizing unit that flattens the ink layer.

  According to the above configuration, a flat ink layer can be formed by applying pressure to the ink layer.

  According to the present invention, there is an effect that it is possible to form an ink layer capable of preventing the occurrence of thickness unevenness when pressure is applied.

It is a figure explaining the outline of the manufacturing method of the three-dimensional structure based on one Embodiment of this invention. It is a figure explaining the outline of the manufacturing method of the three-dimensional structure based on one Embodiment of this invention. It is a figure explaining the outline of the inkjet head with which the manufacturing apparatus of the three-dimensional structure which concerns on one Embodiment of this invention is provided. It is a figure explaining the problem in manufacture of the three-dimensional structure by the conventional inkjet method.

<First Embodiment>
A method for manufacturing a three-dimensional structure according to one embodiment (first embodiment) of the present invention will be described in more detail with reference to FIG.

  As shown to (a)-(b) of FIG. 1, the manufacturing method of the three-dimensional structure which concerns on one Embodiment is the 2nd direction (Y direction) which cross | intersects the 1st direction (X direction) which the inkjet head 30 scans. Ink discharge process of forming one ink layer 50 by discharging ink that is cured by light irradiation among a plurality of nozzle rows 10 including a plurality of nozzles 1 provided along It includes an ultraviolet irradiation step of curing one ink layer 50 by irradiating light after forming the one ink layer 50 in the ink ejection step.

  Thereby, after ejecting the ink required to form the ink layer 50, the ink layer 50 can be irradiated with ultraviolet rays under the same conditions. For this reason, the ink layer 50 can be uniformly cured. Therefore, by applying pressure, it is possible to form the ink layer 50 that can prevent wavy unevenness in the ink layer and non-uniform thickness. That is, the ink layer 50 suitable for manufacturing a three-dimensional structure can be formed. Hereinafter, the wavy unevenness of the ink layer may be referred to as “pass unevenness”.

  Further, in the present embodiment, one ink layer 50 is formed by ejecting ink from the plurality of nozzle arrays 10 by one scan of the ink jet head 30, and the ultraviolet irradiation process is performed.

  Further, as shown in FIG. 1C, a flattening step of flattening the one ink layer by a pressurizing means after the ultraviolet irradiation step is included.

  In the manufacturing method of the three-dimensional structure according to the present embodiment, one ink layer 50 is stacked by repeating the nozzle discharge process, the ultraviolet irradiation process, and the planarization process. 1A to 1C, as an example, formation of the ink layer 50 (2) on the ink layer 50 (1) by the method for manufacturing a three-dimensional structure according to the present embodiment will be described.

[Ink ejection process]
As shown in FIG. 1A, in the ink ejection process included in the method for manufacturing a three-dimensional structure according to this embodiment, the trajectories of the nozzles 1 moving in the X direction do not overlap each other. A plurality of nozzle rows 10 are arranged to discharge the ink.

  Thereby, the resolution of the ink layer 50 formed by one scan of the inkjet head can be increased. Further, the number of scans of the inkjet head required to form one ink layer can be reduced.

  The plurality of nozzle rows 10 are configured to eject clear, white, or special color ink in a single color instead of the four colors of yellow (Y), magenta (M), cyan (C), and black (K). Also good. Thereby, a single color ink layer can be suitably formed.

  The plurality of nozzle rows 10 provided in the inkjet head may be configured to discharge four colors of yellow (Y), magenta (M), cyan (C), and black (K). Thereby, an ink layer with high resolution can be formed, and a delicate image can be printed on a three-dimensional structure.

(Multiple nozzle rows 10)
As shown to (a) of FIG. 1, the some nozzle row 10 consists of the nozzle rows 11-13 as an example, and each nozzle row is provided with the some nozzle 1. As shown in FIG. Here, the nozzles 1 provided in the nozzle rows 11 to 13 are arranged so as to be shifted so that the loci of the nozzles 1 in the nozzle rows 11 to 13 do not overlap each other. Thereby, the resolution of the ink layer 50 ejected by one scan can be improved in the width a along the Y direction, which is the direction intersecting the scanning direction of the plurality of nozzle rows 10. That is, it is possible to obtain a resolution that cannot be achieved by ejecting ink from any one of the nozzle array 11 and the nozzle arrays 12 and 13.

  1A illustrates an example in which three nozzle rows 11 to 13 are provided as the plurality of nozzle rows 10, but the number of nozzle rows is not limited thereto. In the method for manufacturing a three-dimensional structure according to the present invention, the resolution in the width a shown in FIG. 1A is adjusted by appropriately adjusting the number of nozzle rows and the resolution of the ink layer that can be formed by one nozzle row. It should be improved.

  For example, the nozzle rows 11 to 13 may be arranged so as to be displaced from each other, and ink may be ejected at a time with a resolution of 300 dpi or more and 2000 dpi or less in the width a. Accordingly, the ink layer 50 having a sufficient resolution can be formed by scanning the ink jet head once ((b) of FIG. 1).

(ink)
The ink that is cured by irradiating light used in the method for producing a three-dimensional structure according to the present invention is typically an ultraviolet curable ink. The ultraviolet curable ink is an ink that is cured by being irradiated with ultraviolet rays, and includes, as a binder, a resin such as a monomer or an oligomer that is polymerized by being irradiated with ultraviolet rays. Examples of such a resin include epoxy acrylate, urethane acrylate, and polyester acrylate. The ultraviolet curable ink may contain a photopolymerization initiator, a sensitizer, a pigment, a dye, and the like. Moreover, you may contain a leveling agent, an antifungal agent, etc. as another component, for example.

[Ultraviolet irradiation process]
The method for manufacturing a three-dimensional structure according to the present embodiment includes an ultraviolet irradiation process for curing one ink layer 50 by irradiating light after forming one ink layer 50 in the ink ejection process. doing.

  In the ultraviolet irradiation step, the means for irradiating the ultraviolet rays is not particularly limited, and a light source used for a conventionally known ultraviolet curable ink can be adopted. As an example, as shown in FIG. The UV LED 20 provided at 30 may be irradiated with ultraviolet rays.

  For example, when the inkjet head 30 is scanned on the right side in the X direction in FIG. 3A, the ink is ejected by the plurality of nozzle rows 10, and the UVLED 20 located on the left side in the plane of the inkjet head 30 is used. The ink layer 50 may be irradiated with ultraviolet rays. Accordingly, one ink layer can be formed in the ink ejection process by one scan of the inkjet head 30, and the ultraviolet irradiation process can be continuously performed. Thereafter, the ink layer 50 can be continuously cured by an ultraviolet irradiation process. That is, the ink layer 50 having a uniform hardness can be suitably formed by one scan of the inkjet head 30 ((b) in FIG. 1).

[Planarization process]
The three-dimensional structure manufacturing method according to the present embodiment includes a flattening step of flattening the one ink layer by a pressurizing unit (pressurizing means) after the ultraviolet irradiation step.

  In the flattening step, a force is applied to the ink layer 50 after being irradiated with ultraviolet rays by a pressing means to flatten the ink layer 50 ((c) in FIG. 1).

  Thereby, the thickness of the ink layer 50 can be made uniform, and the ink layer 50 can be laminated with high accuracy. Accordingly, it is possible to prevent the three-dimensional structure from being distorted due to the path unevenness of the ink layer.

  As the pressurizing unit (pressurizing means), for example, a metal roller, a flat metal member, pad rubber such as silicon, a Teflon (registered trademark) roller, a Teflon (registered trademark) film, or the like may be used. .

  In the flattening step, for example, a polyethylene film or the like may be coated on the ink layer 50 after the ultraviolet irradiation, and the pressure may be applied to the ink layer 50 through the polyethylene film by the pressure unit. Accordingly, the ink layer 50 can be preferably flattened while preventing the pressurizing portion from being contaminated by the ink of the ink layer 50.

  The ink layer 50 shown in FIG. 1B has high resolution, and the cured resin has a uniform hardness. Therefore, the ink layer 50 can be suitably flattened by the flattening step ((c) in FIG. 1).

  On the other hand, the ink layer 60 formed by the multi-pass method is different in the number of times each of the ink layers 60, 60 ′ and 60 ″ has been irradiated with ultraviolet rays (FIG. 4B). When pressure is applied to 60, pass unevenness occurs due to variations in the hardness of the ink forming the ink layer 60 (FIG. 4C), and thus the ink layer 60 formed by the multi-pass method is laminated. Then, distortion occurs in the three-dimensional structure.

<Second Embodiment>
The manufacturing method of the three-dimensional structure according to one embodiment (second embodiment) of the present invention will be described in more detail with reference to FIG.

  In the method for manufacturing a three-dimensional structure according to the present embodiment, in the ink ejection process, the inkjet head 31 is scanned while ejecting the ink from one nozzle row, and the one ink layer is scanned a plurality of times. 50 is formed.

  Also with the above configuration, after forming one ink layer 50, the ink layer 50 can be irradiated with ultraviolet rays by one ultraviolet irradiation. Therefore, the hardness of one ink layer 50 can be made uniform.

  In this embodiment as well, it goes without saying that a three-dimensional structure is manufactured by repeating the ink discharge process, the ultraviolet irradiation process, and the flattening process.

  In the present embodiment, as an example, as shown in FIGS. 2A and 2B, a support material 51 that has been cured in advance by ultraviolet irradiation on one ink layer 50 (1) is used as a mold. The configuration used will also be described.

(Support material 51)
The support material 51 is a mold used to prevent the uncured ink layer 50 (2) before ultraviolet irradiation from flowing and causing resolution degradation. As shown in FIG. 2A, before performing the ink ejection process, a support material 51 serving as a mold is previously formed on the ink layer 50 (1) where the ink layer 50 (2) is to be formed. Just keep it.

  It is preferable that the support material 51 can be formed from ink ejected using an inkjet method. The support material 51 has such a strength that the ink layer does not fall even if an ink layer is formed thereon, but is finally a portion that is not included in the three-dimensional structure. For this reason, the support material 51 is composed of removable ink. As the support material 51, it is preferable to use an ink that is cured by ultraviolet rays (cured to such an extent that it can be removed in a subsequent process). Further, as an example, an ink that is water-soluble and can be dissolved and removed later with water may be used.

[Ink ejection process]
In the ink discharge process included in the method for manufacturing a three-dimensional structure according to the present embodiment (second embodiment), ink may be discharged using the inkjet head 31 shown in FIG. Here, in the inkjet head 31, the trajectories in the X direction of the nozzles of the plurality of nozzle rows 10 overlap. That is, the inkjet head 31 is an inkjet head used in a multi-pass method, for example. The manufacturing method of the three-dimensional structure according to the present embodiment can be performed using a commonly used inkjet head.

  Also in this embodiment, the nozzle rows 11 to 14 of the inkjet head 31 may be configured to eject four colors of yellow (Y), magenta (M), cyan (C), and black (K). Furthermore, you may further provide the nozzle which discharges the ink of clear, white, or a specific color. The plurality of nozzle rows 10 may be configured to eject clear, white, or specific color ink in a single color instead of the four colors of YMCK.

  However, in the ink ejection process according to the present embodiment, UV irradiation is not performed by the UVLED 20 while ink is ejected while the inkjet head 31 is scanned a plurality of times. As a result, ink necessary for forming one ink layer 50 is ejected (FIG. 2B). For this reason, one ultraviolet ray can be emitted for one formation of the ink layer 50. Therefore, the hardness of the ink layer 50 can be made uniform.

  The number of scans of the inkjet head is, for example, preferably 1 or more and 32 or less, more preferably 4 or more and 16 or less. By setting the number of scans of the inkjet head 31 to 4 times or more and 16 times or less, the ink layer 50 with sufficient resolution can be formed. Moreover, the ink layer 50 having a thickness that can be suitably cured in the subsequent ultraviolet irradiation step can be formed.

[Ultraviolet irradiation process]
An ink layer 50 (2) is formed on one ink layer 50 (1) by ejecting ink while scanning the inkjet head 31 a plurality of times, and then an ultraviolet irradiation process is performed. Further, in the ultraviolet irradiation step, as in the first embodiment, the means for irradiating the ultraviolet rays is not particularly limited. However, as shown in FIG. 3B, the ultraviolet LED 20 provided in the inkjet head 31 emits ultraviolet rays. It is good to irradiate.

  In the method for manufacturing a three-dimensional structure according to this embodiment, the inkjet head 31 does not irradiate ultraviolet rays in the ink ejection process, and irradiates ultraviolet rays by the UVLED 20 after the ink ejection process is completed. For this reason, similarly to the case of the first embodiment, one ink layer 50 (2) can be irradiated with the same amount of ultraviolet light under the same conditions. Therefore, the hardness of the ink layer 50 (2) can be made uniform.

  Also in the manufacturing method of the three-dimensional structure according to the present embodiment, since the hardness of the ink layer 50 can be made uniform, if the flattening step is performed as in the first embodiment, the ink layer 50 (2 ) Can be suitably planarized. Therefore, the description of the planarization process is omitted in this embodiment.

<Manufacturing device for three-dimensional structure>
The inkjet head 30 which is one embodiment of the inkjet head provided in the three-dimensional structure manufacturing apparatus according to the present invention will be described in more detail with reference to FIG.

  As shown to (a) of FIG. 3, the manufacturing apparatus of the three-dimensional structure which concerns on one Embodiment is provided with the inkjet head 30, and the inkjet head 30 has the several nozzle row 10 which consists of the nozzle rows 11-14, and A UVLED 20 is provided. Moreover, the manufacturing apparatus of the three-dimensional structure according to one embodiment includes a pressurizing unit (pressurizing means, not shown).

(Inkjet head 30)
The inkjet head 30 forms an ink layer by ejecting ink from the plurality of nozzle rows 10 while scanning over the ink layer.

  The inkjet head 30 includes a plurality of nozzle rows 10 including a plurality of nozzles 1 provided along a second direction (Y direction) intersecting a first direction (X direction) scanned by the inkjet head 30, and a plurality of nozzles The rows 10 are arranged so that the nozzle trajectories of the nozzle rows 11 to 14 moving in the X direction do not overlap each other.

  In the nozzle rows 11 to 14, the resolution of the ink layer formed by ejecting ink from each one nozzle row is preferably 70 dpi or more and 2400 dpi or less, and 150 dpi or more and 600 dpi or less. It is more preferable.

  If the resolution of the ink ejected from one nozzle row is preferably 70 dpi or more and 2400 dpi or less, a high resolution ink layer that cannot be achieved by one nozzle row is formed by providing a plurality of nozzle rows. Can do. In addition, the arrangement of the nozzle rows can be suitably adjusted so that the trajectories in the X direction of the nozzles 1 provided in the nozzle rows do not overlap.

  In addition, the inkjet head 30 preferably ejects ink at a time using a plurality of nozzle arrays 10 so as to have a resolution of 100 dpi or more and 5000 dpi or less, and a plurality of nozzles so as to have a resolution of 300 dpi or more and 2000 dpi or less. It is more preferable to eject ink at a time using the row 10.

  If the inkjet head 30 includes a plurality of nozzle arrays 10 capable of printing with a resolution of 300 dpi or more and 2000 dpi or less, a plurality of nozzles can be used without excessively increasing the resolution of the ink layer ejected by one nozzle array. The column 10 can form a high resolution ink layer.

  As described above, by adjusting the resolution of each nozzle row by adjusting the resolution of each nozzle row, the plurality of nozzle rows 10 can be 300 dpi or more in the width a along the Y direction in one scan. The ink can be ejected at a resolution of 2000 dpi or less ((a) in FIG. 1). Thus, ink with sufficient resolution can be ejected by a single scan of the inkjet head. Therefore, the manufacturing method of the three-dimensional structure according to the present invention can be suitably implemented.

(UVLED20)
As shown in FIG. 3A, the UV LED 20 is provided in the inkjet head 30 as means for irradiating ultraviolet rays. Here, the UVLED 20 may be provided before and after the plurality of nozzle rows 10 in the scanning direction in the X direction in which the inkjet head 30 scans. Accordingly, even when the inkjet head 30 scans in the front and rear directions in the X direction in FIG. 3A, after the ink layer 50 is formed by ejecting ink by the plurality of nozzle rows 10, the continuous printing is performed. The ink layer 50 can be irradiated with ultraviolet rays.

(Pressure part)
The three-dimensional structure manufacturing apparatus includes a pressurization unit (pressurization unit) that flattens the ink layer 50. As described above, the pressurizing unit may be composed of a metal roller, a flat metal member, pad rubber such as silicon, a Teflon (registered trademark) roller, a Teflon (registered trademark) film, or the like.

[Additional Notes]
The method for manufacturing a three-dimensional structure according to one aspect of the present invention is a method for manufacturing a three-dimensional structure for forming a three-dimensional structure by laminating the ink layers 50, and is a first method that the inkjet head 30 scans. Among the plurality of nozzle rows 10 composed of the plurality of nozzles 1 provided along the second direction intersecting with one direction, at least one nozzle row ejects ink that is cured by being irradiated with light. An ink ejection process for forming one ink layer 50, an ultraviolet irradiation process for curing one ink layer 50 by irradiating light after forming one ink layer 50 in the ink ejection process, Is included.

  According to the above configuration, after ejecting the ink required to form the ink layer 50, the ink layer 50 can be irradiated with ultraviolet rays under the same conditions. For this reason, the ink layer 50 can be uniformly cured. Accordingly, it is possible to form the ink layer 50 capable of preventing the occurrence of uneven thickness due to the application of pressure. That is, the ink layer 50 suitable for manufacturing a three-dimensional structure can be formed.

  In one aspect of the method for manufacturing a three-dimensional structure according to the present invention, in the ink ejection step, the plurality of nozzle rows 10 are arranged so that the trajectories of the nozzles 1 moving in the first direction do not overlap each other. And ejects the ink.

  According to the above configuration, the resolution of the ink layer 50 formed by one scan of the inkjet head 30 can be increased. For this reason, the frequency | count of the scanning of the inkjet head 30 required in order to form the one ink layer 50 can be decreased.

  In one aspect of the method for producing a three-dimensional structure according to the present invention, in addition to the above configuration, in the ink ejection step, the ink jet head is scanned while the ink is ejected from the nozzle row 10 to perform once. The one ink layer 50 is formed by scanning.

  According to the above configuration, since one ink layer 50 is formed by one scan of the inkjet head 30, the ink layer 50 having a uniform hardness can be formed by one ultraviolet irradiation.

  In one aspect of the method for producing a three-dimensional structure according to the present invention, in the ink ejection step, the inkjet head 31 is scanned while ejecting the ink from one nozzle row 11, 12, or 13, The one ink layer 50 may be formed by a plurality of scans.

  According to the above configuration, ultraviolet rays can be irradiated after one ink layer 50 is formed by causing an inkjet head including one nozzle row 11, 12, or 13 to scan a plurality of times. For this reason, the ink layer 50 can be uniformly cured. Therefore, it is possible to form the ink layer 50 that can prevent the occurrence of uneven thickness due to the application of pressure, and it is possible to form the ink layer 50 suitable for manufacturing a three-dimensional structure.

  One aspect of the method for producing a three-dimensional structure according to the present invention includes, in addition to the above configuration, a flattening step of flattening the one ink layer 50 by a pressure unit after the ultraviolet irradiation step.

  According to the above configuration, by applying pressure to the ink layer 50 having a uniform hardness, it is possible to form a flat ink layer 50 with no thickness unevenness.

  One aspect of the three-dimensional structure manufacturing apparatus according to the present invention includes a plurality of ink jet heads 30 that scan over an ink layer and a second direction that intersects a first direction that the ink jet head 30 scans. A plurality of nozzle rows 10 composed of a plurality of nozzles 1, wherein the plurality of nozzle rows 10 are trajectories of nozzles of a certain nozzle row 11 that moves in the first direction, and another nozzle row that moves in the first direction. The nozzle rows 12 to 14 are arranged so as not to overlap with the nozzle trajectories.

  According to the above configuration, the resolution of the ink layer 50 that can be ejected by the inkjet head 30 by one scan can be increased. Therefore, the ink layer 50 having a uniform hardness can be formed. That is, the manufacturing method of the three-dimensional structure according to the present invention can be suitably implemented.

  The apparatus for manufacturing a three-dimensional structure according to the present invention includes a pressurizing unit (pressurizing unit) that flattens the ink layer 50.

  According to the above configuration, by applying pressure to the ink layer 50 having a uniform hardness, it is possible to form a flat ink layer 50 with no thickness unevenness.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  The present invention can be used for manufacturing a three-dimensional structure.

1 Nozzle 10 Nozzle Row 11 Nozzle Row 12 Nozzle Row 13 Nozzle Row 14 Nozzle Row 30 Inkjet Head 31 Inkjet Head

Claims (7)

A method for manufacturing a three-dimensional structure for forming a three-dimensional structure by laminating ink layers,
Ink that is cured by being irradiated with light from at least one nozzle row out of a plurality of nozzle rows composed of a plurality of nozzles provided along a second direction intersecting with the first direction scanned by the inkjet head is ejected. And an ink ejection step for forming one ink layer,
A method of producing a three-dimensional structure, comprising: forming an ink layer in the ink ejection step, and then irradiating light to cure the one ink layer. .   2. The ink ejection step, wherein the plurality of nozzle arrays are arranged so that the trajectories of the nozzles moving in the first direction do not overlap each other, and the ink is ejected. The manufacturing method of three-dimensional structure.   3. The ink ejection process according to claim 1, wherein in the ink ejection step, the ink jet head is scanned while ejecting the ink from the nozzle row, and the one ink layer is formed by one scan. The manufacturing method of three-dimensional structure.   2. The ink ejection step of scanning the ink jet head while ejecting the ink from one nozzle row and forming the one ink layer by a plurality of scans. The manufacturing method of the described three-dimensional structure.   The method for producing a three-dimensional structure according to any one of claims 1 to 4, further comprising a flattening step of flattening the one ink layer by a pressurizing means after the ultraviolet irradiation step. Method. An inkjet head that scans over the ink layer;
A plurality of nozzle rows comprising a plurality of nozzles provided along a second direction intersecting a first direction scanned by the inkjet head,
The plurality of nozzle rows are arranged such that the nozzle trajectory of one nozzle row moving in the first direction and the nozzle trajectory of another nozzle row moving in the first direction do not overlap each other. An apparatus for producing a three-dimensional structure characterized by that.   The three-dimensional structure manufacturing apparatus according to claim 6, further comprising a pressurizing unit that flattens the ink layer.

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