KR20240064976A - 3D printer and method of fabricating the same - Google Patents

Abstract

3D printer is launched. A 3D printer includes a resin tank that accommodates a photocurable liquid resin, a molding section having a molding plate provided in the resin tank and a lifting and lowering drive unit that lifts and drives the molding plate or the resin tank, an exposure section that irradiates light toward the molding plate, A control unit that controls the exposure part and the lifting unit so that a plurality of unit molding layers are sequentially stacked on the molding plate, and a release liquid provided at the bottom of the resin tank facing the molding plate and helping to separate the unit molding layers. It includes a release layer having a molded surface with pores formed therein.

Description

3D printer and method of manufacturing the same {3D printer and method of fabricating the same}

The present invention relates to a 3D printer and its manufacturing method that can improve the speed of continuous stacking of 3D molded products.

Although 3D printing technology is developing rapidly, the manufacturing process itself is still not fast. This is because it is based on a two-dimensional lithography method that patterns a three-dimensional structure into two dimensions and stacks them layer by layer. In particular, in the case of DLP-type photocuring 3D printing technology, there are limitations to high-speed production because each time a two-dimensional image is cured and produced layer by layer, it must go through the steps of resin supply, solidification, interface separation, and access. In other words, due to the adhesive force (liquid-solid adhesion) due to the high viscosity of the liquid resin and the interfacial adhesion (solid-solid interfacial adhesion) due to the liquid-solid phase change that occurs during the photocuring process, there is a limit to the printing speed, a limit to the maximum printing area, And this causes a decrease in the durability of the transparent release material.

The purpose of the present invention is to provide a 3D printer and a manufacturing method thereof that can overcome production speed limitations.

Another object of the present invention is to provide a 3D printer and a manufacturing method capable of 3D printing a plurality of unit forming layers in a large area and at ultra-high speed using a continuous stacking method rather than a layer-by-layer stacking method.

A 3D printer according to an embodiment of the present invention is provided to achieve the above-described problem. A 3D printer includes a resin tank that accommodates a photocurable liquid resin, a molding section having a molding plate provided in the resin tank and a lifting drive unit that lifts and drives the molding plate or the resin tank, an exposure section that irradiates light toward the molding plate, A control unit that controls the exposure part and the lifting unit so that a plurality of unit molding layers are sequentially stacked on the molding plate, and a release liquid provided at the bottom of the resin tank facing the molding plate and helping to separate the unit molding layers. It includes a release layer having a molded surface with pores formed therein.

The release layer includes a film in which a porous layer is formed, and the film may be placed on the bottom of the resin tank.

The film and the release layer may be made of a transparent material.

The pores of the molded surface may have a random shape.

The pores may have a diameter of 2㎛ or less.

The resin tank includes a base member forming a bottom,

The release layer may be formed by coating one surface of the base member.

The 3D printer may further include a plurality of microlenses provided on the back side of the base member.

A method of manufacturing a 3D printer according to an embodiment of the present invention is provided. A 3D printer includes a resin tank that accommodates a photocurable liquid resin, a molding section having a molding plate provided in the resin tank and a lifting drive unit that lifts and drives the molding plate, an exposure section that irradiates light toward the molding plate, and the molding plate. It includes a control unit that controls the exposure unit and the lifting unit so that a plurality of unit molding layers are sequentially stacked. The manufacturing method of a 3D printer includes providing a base member, forming a release layer with a porous molded surface on the base member, and A release liquid that helps separate the unit molding layer is contained in the pores of the release layer to form a release layer provided with a lubricating liquid thin film on the molding surface, and the base member on which the release layer is formed is placed at the bottom of the resin tank. Includes steps.

A method of manufacturing a 3D printer according to another embodiment of the present invention is provided. The 3D printer includes a resin tank that accommodates a photocurable liquid resin, a molding section having a molding plate provided in the resin tank and a lifting drive unit that lifts and drives the molding plate, an exposure section that irradiates light toward the molding plate, and the molding plate. It includes a control unit that controls the exposure unit and the lifting unit so that a plurality of unit molding layers are sequentially stacked. The manufacturing method of a 3D printer is to prepare a base member, apply a transparent resin layer impregnated with soluble microelements to the base member, dissolve the microelements in the transparent resin layer with a solution to form pores, and form a molded surface. It includes forming a release layer in which a release liquid that helps separate the unit molding layer is infiltrated into the pores so that a lubricating liquid thin film is formed, and placing the base member on which the release layer is formed at the bottom of the resin tank.

The 3D printer according to one embodiment of the present invention has micro-scale fine lenses provided in the light path so that the light irradiated from the exposure area is focused on the molding surface of the bottom of the resin tank. Micro-scale fine lenses serve as lenses that reduce the actual projection area on the projection plane of the DLP pixel, and by being positioned at a distance equal to the focal length from the projection plane, the image of the DLP pixel can be reduced. Photocuring of liquid resin begins on the surface projected from the pixel. Therefore, the interfacial adhesion (solid-solid interfacial adhesion) is reduced by the square of the projection area according to the contact model theory, so it can be reduced by about 10-20 times by the projection area reduced by micro-scale microlenses. there is.

In addition, the 3D printer according to one embodiment of the present invention focuses on the unique surface function of various living things in nature and nanoscale formed at the interface (molding surface) so that a lubricating liquid thin film is formed at the interface of the mold release layer where the photocurable liquid resin is in contact. The release liquid was infiltrated into the pores of . The lubricating liquid thin film formed in this way significantly reduces the interfacial adhesion caused by the liquid-solid phase change that occurs during the photocuring process, preventing the liquid resin solidified during the phase change process from sticking to the molding surface where the micro-scale fine lenses focus. do. The lubricating liquid thin film is very transparent and has a low surface energy, so it is slippery for all types of liquids. It does not react with any photocurable resin and separates the solidified liquid resin, increasing the adhesive strength by about 10-20. It can be reduced to twice the level.

The final interfacial adhesion could be reduced by about 100 times by minimizing the projected area by microscale microlens and minimizing the interfacial adhesion by the lubricating liquid thin film. Through this, a large-area and ultra-high-speed continuous lamination method was possible. 3D printing is possible.

In addition, the pores containing the release liquid can be manufactured on a micro/nano scale, preferably with a diameter of 2 μm or less. The very large number of micro/nano scale pores can provide great retention for infiltrating release fluid. As a result, the release layer can prevent the flow of release liquid on the molding surface, and when the unit molding layer is separated, the overall molding surface is uniform and provides high mold release ability, thereby reducing the stress caused by separation and improving durability. .

In addition, since the release layer can provide sufficient release ability only with the release liquid contained in the pores, it is not made of a release material, for example, fluororesin (Teflon), and has low release properties, but has excellent processability and is inexpensive. It can be manufactured using materials. Of course, if the release layer is made of a release material, it can provide even better release ability.

1 is an explanatory diagram of a 3D printer according to an embodiment of the present invention.
Figure 2 is a view showing the bottom plate of a resin tank according to an embodiment of the present invention.
Figures 3a and 3b are diagrams to explain the contact theory for a pixel projection plane without applying a fine lens (LNS) and a pixel projection plane with a reduced projection area by applying a fine lens (LNS), respectively. .
Figure 4 is a graph comparing the interfacial adhesion (Fsp) for the plate-plate contact of Figure 3a and the point-plate contact of Figure 3b.
Figures 5a and 5b are respectively enlarged SEM images showing the cross-section and molded surface of the release layer according to an embodiment of the present invention.
Figure 6 is a graph comparing the interfacial adhesion (Fsp) of the lubricating liquid thin film (Slippery) of the present invention and the release surface (FEP) of a conventional release material.
Figure 7 is a graph showing the transparency of the release layer.
Figure 8 is an operation diagram of a 3D printer according to an embodiment of the present invention.
Figure 9 is a block diagram showing the configuration of a 3D printer according to an embodiment of the present invention.
Figure 10 is a flowchart showing a method of manufacturing a release layer according to an embodiment of the present invention.
Figure 11 is a flowchart showing a method of manufacturing a release layer according to another embodiment of the present invention.

Hereinafter, a 3D printer 1 according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

1 is an explanatory diagram of a 3D printer 1 according to an embodiment of the present invention.

The 3D printer 1 includes a resin tank 10, a molding unit 20 having a molding plate 21 and a lifting unit 22, an exposure unit 30, and a control unit 40.

As shown in FIG. 1, the present invention is described based on the bottom-up 3D printer 1 in which the molding plate 21 rises and stacks within the resin tank 10, but the top-down 3D printer 1 in which the molding plate 21 descends and stacks. It can also be applied to 3D printers. Hereinafter, an embodiment of the 3D printer 1 of the present invention will be described using a non-limiting resin tank method.

The resin tank 10 stores photocurable liquid resin and has an open upper surface. As shown in FIG. 1, the resin tank 10 includes an upper frame 11, a transparent bottom plate 12, and a lower frame 13, and their combination creates a storage space that can accommodate photocurable liquid resin. forms.

The upper frame 11 forms the side wall of the resin tank 10 in the shape of a square or circular cylinder with the upper and lower ends open.

The bottom plate 12 covers the open lower part of the upper frame 11 and forms a floor. The bottom plate 12 includes a lens unit 121 with a plurality of fine lenses (LNS) on one side, and a base member made of a transparent material coupled to the lens unit 121 or disposed adjacent to the lens unit 121 ( 122).

The lens unit 121 is disposed between the molding plate 21 and the exposure unit 30. The light irradiated by the exposure unit 30 passes through the lens unit 121, the base member 122, and the release layer 123 and forms a photocurable liquid resin on the lubricating liquid thin film 124 on the molding surface S2. hardens. At this time, the lens unit 121 refracts and guides the light irradiated from the exposure unit 30 so that the exposure area of the liquid resin in contact with the lubricating liquid thin film 124 on the molding surface (S2 in FIG. 2) is minimized.

The base member 122 is provided with a lens unit 121 adjacent to or integrally with one surface. The base member 122 is provided with a release layer 123 made of a transparent material on the other side.

The release layer 123 includes a molding surface S2 on which the unit molding layers 2-1 are sequentially molded. The release layer 123 allows the unit molding layer 2-1 to be easily released (separated) when the molding plate 21 rises. The release layer 123 has pores in which a release liquid is contained (permeated) to help separate the unit molding layer 2-1. At this time, the pores may be exposed to the molding surface (S2) and the contained mold release liquid may be exposed to the molding surface (S2). As a result, a lubricating liquid thin film 124 may be formed on the molded surface S2 of the release layer 123.

The release fluid needs to be a material that is non-reactive and non-mixable with the photocurable liquid resin. The release liquid must have excellent heat resistance and be non-volatile at high temperatures.

The release liquid may be made of a non-curable flowable material with a specific gravity different from the photocurable liquid resin. The release liquid may have a higher specific gravity than the photocurable liquid resin.

The release liquid is 1.5 times or more, preferably 2 times or more, and more preferably 3 times or more compared to the specific gravity of the photocurable liquid resin. The higher the specific gravity of the release liquid, the less it is affected by the lifting movement of the molding plate 21, allowing the lubricating liquid thin film 124 to stably maintain its shape.

The release liquid should be selected to have a sufficiently high boiling point. In the process of photocuring the photocurable liquid resin, reaction heat is generated, and if the release liquid undergoes a phase change due to this curing reaction heat, the quality of the molded product 600 may deteriorate. The boiling point of the release liquid is preferably higher than the boiling point of water, and more preferably 90°C or higher.

Additionally, the kinematic viscosity of the release liquid is preferably 0.4 cst to 50 cst at 25°C. If the kinematic viscosity of the release liquid is less than 0.4cst at 25℃, excessive flow occurs even with a small force, deteriorating the quality of the molded product, and if it is more than 50cst, problems such as difficult handling, such as injecting or processing into the resin tank (12), occur. there is.

Release fluids include silicone oils, perfluorocarbon liquids, perfluoroFluorinated vacuum oils (e.g. Krytox 1506 or Fromblin 06/6), fluorinated colorants (e.g. manufactured by 3M and FC At least one or more substances selected from the group consisting of perfluoro-tripentylamine (commercially available as -70), ionic liquid, water-immiscible fluorinated ionic liquid, silicone oil containing PDMS, and fluorinated silicone oil. You can.

A detailed description of the lens unit 121 and the release layer 123 will be described later.

The space between the upper frame 11 and the bottom plate 12 may be sealed with a sealing material to prevent the contained photocurable liquid resin from leaking.

The lower frame 13 supports the bottom plate 12 on the upper frame 11.

As a modified example, the upper frame 11 and the bottom plate 12 may have a container shape with an open top.

The molding unit 20 includes a molding plate 21 that can be raised and lowered within the resin tank 10 and a lifting drive unit 22 that raises and lowers the molding plate 21.

The molding plate 21 supports the molding 2, which is formed by sequentially stacking a plurality of unit molding layers 2-1 in a plate shape.

The lifting drive unit 22 lifts and lowers at least one of the resin tank 10 and the molding plate 21. The hoisting section eastern part 22 may be comprised of a hoisting rail (not shown) and a hoisting drive motor (not shown) that lifts the hoisting rail. The lifting rail may be coupled while supporting at least one of the resin tank 10 and the molding plate 21.

The exposure unit 30 is disposed at the bottom of the resin tank 10 and outputs ultraviolet light that cures the photocurable liquid resin upward toward the light-receiving surface of the bottom plate 12 (S1 in FIG. 2).

The control unit 40 controls the exposure unit 30 to output light corresponding to the image of the unit molding layer 2-1, and the lifting drive unit ( 22) is controlled. The control unit 40 may control the exposure unit 30 and the lifting unit 22 in order or simultaneously, depending on the molding method of the 3D printer 1.

Figure 2 is a diagram showing the bottom plate 12 according to an embodiment of the present invention.

The bottom plate 12 is made of a first material with a high refractive index, the lens part 121 has a light-receiving surface S1 facing the exposure part 30, and is made of a transparent second material with a lower refractive index than the first material. A base member 122 provided close to or integral with the portion 121, a transparent porous release layer 123 provided on the base member 122, and a lubricating liquid thin film formed on the molded surface S2 of the release layer 123. Includes (124).

A plurality of fine lenses (LNS) are formed in the lens unit 121 to converge and then diffuse the light irradiated from the exposure unit 30 on the molded surface S2. The fine lens (LNS) has the shape of a convex lens that is convex toward the release layer 123. The lens unit 121 may be made of a transparent material that transmits light well. The lens unit 121 may include a microlens in the shape of a concave lens that is concave toward the release layer 123.

The lens unit 121 is preferably made of a material with excellent release properties, but is not limited thereto. The lens unit 121 may be made of, for example, Fluorinated Ethylene Propylene (FEP), Perfluoroalkoxy Alkanes (PFA), Ethylene Tetra Fluoro Ethylene (ETFE), Poly Tetra Fluoro Ethylene (PTFE), etc.

The light irradiated from the exposure unit 30 passes through the lens unit 121, the base member 122, and the release layer 123 to cure the photocurable liquid resin on the lubricating liquid thin film 124. The light irradiated from the exposure unit 30 passes through the light-receiving surface S1 of the lens unit 121, passes through the fine lens (LNS), and enters the base member 122 and the release layer 123, while the lens unit 121 ) and the refractive index difference between the fluid layer or base member 122 adjacent to the lens unit 121. The refracted light converges on the molded surface S2 of the release layer 123 and then spreads. The diffused light has an inverted pyramid shape, and the photocurable liquid resin in the resin tank 10 is cured along the inverted pyramid shape. The first material of the lens unit 121 has a higher refractive index than the second material of the base member 122.

If the lens unit 121 includes a fine lens concave toward the release layer 123, the first material of the lens unit 121 has a lower refractive index than the second material of the base member 122.

The base member 122 has a lens engaging surface (S3) on the opposite side of the forming surface (S2) shaped to engage the fine lens (LNS). The thickness of the base member 122 or the distance between the molded surface (S2) and the microlens (LNS) is determined so that the light is focused on the molded surface (S2) by considering the specifications of each microlens (LNS), for example, the refractive index. can be set. As a modified embodiment, instead of engaging a plurality of fine lenses (LNS) and the lens coupling surface (S3), the lens coupling surface (S3) is flat and an empty space is formed between the fine lenses (LS) and the lens coupling surface (S3). It can be.

Figures 3a and 3b are diagrams for explaining the contact theory for a pixel projection plane without applying a fine lens (LNS) and a pixel projection plane with a reduced projection area by applying a fine lens (LNS), respectively. am.

As shown in FIG. 3A, the pixels of the digital image irradiated from the exposure portion 30 are projected onto the molding surface in parallel without change in size, and are transferred to the same photocurable resin as the pixels of the digital image. Therefore, the interfacial adhesion that occurs when separating the unit forming layer 2-1 occurs based on a projection area equal to the pixel area of the digital image. In this way, interfacial adhesion can be applied to the pixel projection plane without applying a microlens (LNS) and the cured unit forming layer according to the plate-plate contact theory.

As shown in Figure 3b, the pixels of the digital image irradiated from the exposure unit 30 are focused by a microlens (LNS) and projected onto the molding surface in a reduced area, then inverted and gradually expanded and transferred to the photocurable resin. . Therefore, the interfacial adhesion that occurs when separating the unit forming layer (2-1) is generated based on the projection area reduced by the focus of the digital image. In this way, interfacial adhesion can be applied to the pixel projection plane, which is focused and reduced by a microlens (LNS), and the hardened unit forming layer according to the point-plate contact theory.

Figure 4 is a graph comparing the interfacial adhesion (Fsp) for the plate-plate contact of Figure 3a and the point-plate contact of Figure 3b. As shown, the interfacial adhesion of plate-plate contact (Fsp(C ₁ ) ₌ (Area) ² ) is proportional to the square of the projected area (Area), and the interfacial adhesion of point-plate contact (Fsp(C ₂ ) ₌ (Area) ¹ ) is proportional to the projected area (Area). Accordingly, by forming the focus of the digital image on the molding surface by using a fine lens (LNS), the interfacial adhesion that occurs during release of the unit molding layer (2-1) can be reduced by about 10 to 20 times.

The release layer 123 is preferably made of a material that is transparent and has excellent release properties, but is not limited thereto. The release layer 123 may be made of, for example, Fluorinated Ethylene Propylene (FEP), Perfluoroalkoxy Alkanes (PFA), Ethylene Tetra Fluoro Ethylene (ETFE), or Poly Tetra Fluoro Ethylene (PTFE).

As a modified example, the release layer 123 may include a film in which a porous layer is formed. At this time, the film may be placed on the base member 122 of the resin tank 12. The film may be transparent, for example, PET, TPU, PI, PE, glass, etc.

Figures 5a and 5b are respectively enlarged SEM images showing the cross-section of the release layer 123 and the lubricating liquid thin film 124 according to an embodiment of the present invention.

As shown in FIGS. 5A and 5B, the release layer 123 has pores into which a release liquid that helps separate the unit molding layer 2-1 is contained (permeated). The pores may be irregularly sized and formed at a predetermined depth from the molded surface S2 of the release layer 123. As shown in Figure 5 (b), pores are exposed on the molded surface (S2) of the release layer 123, so that a lubricating liquid thin film 124 can be formed by the contained release liquid.

Figure 6 is a graph showing the comparison of the interfacial adhesion (Fsp) between the lubricating liquid thin film (Slippery) 124 of the present invention and the release surface (FEP) of a conventional release material.

The interfacial adhesion (③) of the lubricating liquid thin film 124 of the present invention for a model without a microlens is about 10-20 times the interfacial adhesion (①) of a conventional release surface (FEP) over the same projection area. can be reduced.

Likewise, the interfacial adhesion (④) of the lubricating liquid thin film 124 of the present invention for the model to which the microlens is applied is about 10-20 times that of the conventional release surface (FEP) interfacial adhesion (②) compared to the same projection area. can be reduced.

In particular, the interfacial adhesion (④) of the lubricating liquid thin film 124 of the present invention for the model to which the microlens is applied is about 100 times that of the conventional release surface (FEP) to which the microlens is not applied (①). can be reduced.

As described above, continuous layered photocuring 3D printing is possible in a large area and at ultra-high speed through the minimization of the projection area by the micro-scale fine lens 121 and the minimization of the interfacial adhesion by the lubricating liquid thin film 124.

Figure 7 is a graph showing the transparency of the release layer 123.

The release layer 123 has pores adjacent to the molding surface S2, and even when the release liquid is contained within the pores, it can have a transmittance of more than 90% for light with a wavelength of 405 nm as shown in FIG. 7. Accordingly, the release layer 123 can greatly increase the release ability while minimizing the loss of light for curing the photocurable liquid resin on the molding surface S2.

Figure 8 is an operation diagram of the 3D printer 1 according to an embodiment of the present invention.

Looking at (a) of FIG. 8, the light irradiated from the exposure unit 30 is refracted by the fine lens (LNS) of the lens unit 121 and is focused on the molded surface of the release layer 123. At this time, the light spreads again after reaching the minimum area on the molding surface to harden the photocurable liquid resin disposed between the molding plate 21 and the molding surface.

Looking at (b) of FIG. 8, while the light emitted from the exposure unit 30 is being output toward the modeling plate 21, if the modeling plate 21 is raised by the lifting drive unit (22 in FIG. 1), the sight As the chemical liquid resin continues to fill the space between the molding surface of the release layer 123 and the molding plate 21, the unit molding layers 2-1 are continuously stacked. Therefore, as light is irradiated in the shape of an inverted pyramid, the molding plate 21 rises, so that one layer of the inverted pyramid is partially cured, and the next inverted pyramid layer is partially cured in succession, further curing the upper layer, etc. The layers of the inverted pyramid continue to overlap and build up.

In this way, in the 3D printer 1 according to an embodiment of the present invention, the light irradiated from the exposure unit 30 is refracted by the lens unit 121 to form an image in the minimum area on the molded surface of the release layer 123. The release resistance of the hardened unit molding layer can be minimized by the lubricating liquid thin film 124 formed of the release liquid contained in the pores of the release layer 123. Because of this, the present invention can quickly and continuously manufacture 3D molded products with high quality without stopping work without any special mechanical solutions.

Figure 9 is a block diagram showing the configuration of the 3D printer 1 according to the present invention.

The control unit 40 controls the exposure unit 30 to irradiate light corresponding to each unit molding layer image based on image data dividing the molded product into unit molding layers, and the lifting drive unit 22 controls the molding plate 21. Control it to rise or fall.

Figure 10 is a flowchart showing a method of manufacturing the release layer 122 according to an embodiment of the present invention.

In step S11, a base member in the shape of a film or plate made of a transparent material, for example, polyester (PET), is prepared.

In step S12, a release layer having a porous molding surface is formed on the base member. The porous release layer is made of a material with excellent release properties on the base member and can be formed by forming a plurality of micro-concave-convex portions using, for example, a transfer method or nanoimprinting method, and then pressing the micro-concave-convex portions. When the micro-concave-convex portion is pressed, the tip of the concave portion is pressed and deformed, and the entrance to the concave portion becomes narrow. Therefore, the concave with a narrowed entrance can be of a shape suitable for enclosing the mold release liquid inside.

In step S13, a release liquid that helps separate the unit molding layers is infiltrated into the pores of the release layer to form a lubricating liquid thin film on the molding surface of the release layer. The method of submerging the release liquid into the pores of the release layer is

In step S14, a release layer containing a release liquid contained in pores is placed on the bottom of the resin tank. When the release layer is formed on a transparent thin film, it is placed on the inner bottom surface of the container-shaped resin tank. When the release layer is formed directly on the transparent bottom of the resin tank, the bottom is hermetically coupled to cover the lower part of a frame, for example, having a square or cylindrical shape.

Figure 11 is a flowchart showing a method of manufacturing the release layer 123 according to another embodiment of the present invention.

In step S21, a base member in the shape of a film or plate made of a transparent material, for example, polyester (PET), is prepared.

In step S22, a transparent resin layer impregnated with soluble fine elements is formed on one surface of the base member. The material forming the transparent resin layer is selected as a transparent material that has excellent release properties and does not dissolve in specific solvents.

The transparent resin layer may include, for example, UV-curable resin, photo-curable resin, etc.

The soluble microelement is a transparent material that can be dissolved in a specific solvent. Dissolvable microelements may have a micro/nano scale, that is, a size of 2 μm or less in diameter. If the soluble microelement exceeds 2㎛ in diameter, the holding power of the release liquid that has penetrated the pores formed by dissolution may decrease. If a large number of microelements exceeding 2㎛ in diameter are aggregated and dissolved, excessively large pores may be formed, and as a result, the holding power of the release liquid may be reduced.

Microelements are porous generators and may be in a liquid, gel, or solid state.

The solvent may be determined depending on the material of the microelement. As a solvent, various materials such as water and benzene can be used.

In step S23, the microelements impregnated in the transparent resin layer are dissolved in a solvent to form a porous release layer. The release layer is preferably formed to a thickness of 5㎛ or less so that the microelements impregnated in the transparent resin layer can be sufficiently dissolved.

In step S24, a lubricating liquid thin film is formed on the molding surface of the mold release layer by infiltrating the space where fine elements are dissolved in the porous mold release layer, that is, the pores, with a mold release liquid that helps separate the unit mold layer.

In step S25, a release layer containing a release liquid contained in pores is placed on the bottom of the resin tank. When the release layer is in the form of a film, it is placed on the inner bottom surface of the container-shaped resin tank. The release layer may be formed directly inside the bottom of the resin tank.

In addition, the method of manufacturing the release layer according to an embodiment of the present invention may include various methods such as a molding method, a physical or chemical etching method, a pattern printing curing method, and a physical press pressing method.

In addition, the method of forming a lubricating liquid thin film on the molding surface of the release layer according to an embodiment of the present invention is an absorption type in which the release liquid is absorbed into the porous matrix of the raw material, and the release liquid is applied to the three-dimensional network structure. A gel type that selectively absorbs and forms strong crosslinks, and a self-swelling type that uses the principle that the release liquid swells as it is inserted between layers by an insertion reaction within the matrix, may be applied.

In the above, preferred embodiments of the present invention have been shown and described, but the present invention is not limited to the specific embodiments described above, and may be used in the technical field to which the invention pertains without departing from the gist of the present invention as claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be understood individually from the technical idea or perspective of the present invention.

1: 3D printer 2: Molded object
3: Bed 10: Resin Tank
11: upper frame 12: floor plate
121: Lens unit 122: Base member
123: Release layer 124: Lubricating liquid thin film
13: lower frame 20: forming part
21: Forming plate 22: Hoistway eastern part
30: exposed portion 40: control boot
pore: pore S1: light receiving surface
S2: Molding surface S3: Lens coupling surface
LNS: microlens

Claims (9)

In 3D printers,
A resin tank containing a photocurable liquid resin;
a molding unit having a molding plate provided in the resin tank and a lifting mechanism that lifts and drives the molding plate or the resin tank;
an exposure unit that irradiates light toward the molding plate;
a control unit that controls the exposure unit and the lifting unit so that a plurality of unit molding layers are sequentially stacked on the molding plate; and
A 3D printer comprising a release layer provided at the bottom of the resin tank facing the molding plate and having a porous molding surface to contain a release liquid that helps separate the unit molding layer. According to paragraph 1,
The release layer includes a film in which a porous layer is formed,
A 3D printer wherein the film is placed on the bottom of the resin tank. According to clause 2,
A 3D printer in which the film and the release layer are made of a transparent material. According to paragraph 1,
A 3D printer in which the pores of the molded surface have a random shape. According to paragraph 1,
A 3D printer in which the pores have a diameter of 2㎛ or less. According to clause 1,
The resin tank includes a transparent base member forming a bottom,
A 3D printer in which the release layer is formed by coating one surface of the base member. According to clause 6,
A 3D printer further comprising a plurality of microlenses provided on the back side of the base member. A resin tank that accommodates a photocurable liquid resin, a molding section having a molding plate provided in the resin tank and a lifting drive unit that lifts and drives the molding plate, an exposure section that irradiates light toward the molding plate, and a plurality of plates on the molding plate. In the manufacturing method of a 3D printer including a control unit that controls the exposure unit and the lifting unit so that unit molding layers are sequentially stacked,
Prepare a base member,
Forming a release layer having a porous molded surface on the base member,
Forming a release layer with a lubricating liquid thin film on the molding surface by allowing a release liquid that helps separate the unit molding layer to be contained in the pores of the release layer,
A method of manufacturing a 3D printer comprising the step of placing the base member on which the release layer is formed on the bottom of the resin tank. A resin tank that accommodates a photocurable liquid resin, a molding section having a molding plate provided in the resin tank and a lifting drive unit that lifts and drives the molding plate, an exposure section that irradiates light toward the molding plate, and a plurality of plates on the molding plate. In the manufacturing method of a 3D printer including a control unit that controls the exposure unit and the lifting unit so that unit molding layers are sequentially stacked,
Prepare a base member,
A transparent resin layer impregnated with soluble microelements is applied to the base member,
Forming pores by dissolving the fine elements in the transparent resin layer with a solution,
Forming a release layer infiltrated with a release liquid that helps separate the unit molding layer in the pores so that a lubricating liquid thin film is formed on the molding surface,
A method of manufacturing a 3D printer comprising the step of placing the base member on which the release layer is formed on the bottom of the resin tank.

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