KR102293058B1 - Method for producing three-dimensional crystalline porous structure and filter medium produced by the method - Google Patents

Abstract

The present disclosure relates to a filter medium, and more particularly, to a method for producing a three-dimensional crystalline porous structure through transformation of a 3D model of the structure into a Voronoi structure and melt extrusion lamination modeling, and a biological filter material manufactured by the method will be.
The present disclosure provides a modeling step of forming a 3D model of a structure, a conversion step of converting the 3D model formed in the modeling step into a Voronoi structure, and melt-extrusion of the Voronoi structure (Voronoi Diagram or Voronoi Tessellation) converted in the conversion step Fused Deposition Modeling (FDM) is presented as a three-dimensional crystalline porous structure manufacturing method including an output step using a 3D printer.

Description

Method for manufacturing a three-dimensional crystalline porous structure and a filter medium manufactured by the method

The present disclosure relates to a filter medium, and more particularly, to a method for manufacturing a three-dimensional crystalline porous structure through transformation of a 3D model of the structure into a Voronoi structure and melt extrusion lamination modeling, and a biological filter medium manufactured by the method will be.

Unless otherwise indicated herein, the contents described in this identification are not prior art to the claims of this application, and the description in this identification is not admitted to be prior art.

As a prior art, research on fabricating porous structures such as medical scaffolds using a Fused Deposition Modeling (FDM) 3D printer in the past has been continuously made. Most of the existing porous structure production is a method of forming amorphous pores by using additives such as a foaming agent in the filament. The porous production method using additives can easily form pores. There is a problem in that it is difficult to adjust the size and number of pores.

In addition, the conventional method of manufacturing a biological filter material is a method of crushing ceramic or fiber-reinforced plastic to a specific particle size and immersing it in a mixed solution mixed with defects and other additives, and crushed waste vinyl with stone powder, activated carbon, filter sand, etc. There is a method of manufacturing by adding sub-materials and extrusion cooling, but there was a problem in that the pores were not produced in an optimal size for culturing bacteria using this method.

1. Republic of Korea Patent Registration No. 10-1471435 (Notice on Dec. 11, 2014) 2. Republic of Korea Patent Publication No. 10-2019-0067541 (published on June 17, 2019) 3. Republic of Korea Patent Publication 10-2018-0040555 (published on April 20, 2018) 4. Republic of Korea Patent Registration 10-1869106 (2018.06.19 Announcement) 5. Republic of Korea Patent Publication 10-2019-0034123 (published on April 1, 2019)

Accordingly, an object of the present invention is to provide a filter medium having optimal pores for culturing bacteria through optimal pore size arrangement using a Voronoi structure and the filter medium, since the prior art cannot precisely adjust the size and number of pores. An object of the present invention is to provide a manufacturing method of

In addition, it is not limited to the technical problems as described above, and it is obvious that another technical problem may be derived from the following description.

The present disclosure provides a modeling step of forming a 3D model of a structure, a conversion step of converting the 3D model formed in the modeling step into a Voronoi structure, and melt-extrusion of the Voronoi structure (Voronoi Diagram or Voronoi Tessellation) converted in the conversion step Fused Deposition Modeling (FDM) is presented as a three-dimensional crystalline porous structure manufacturing method including an output step using a 3D printer.

According to an embodiment of the present disclosure, there is provided a biological filter medium that overcomes the limitations of the existing filter medium by having optimum pores to form optimum bacterial culture conditions.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a flow chart for a method for manufacturing a three-dimensional crystalline porous structure according to an embodiment of the disclosed subject matter.
Figure 2 is a flow chart for the transformation step in the three-dimensional crystalline porous structure manufacturing method according to an embodiment of the disclosed subject matter.
3 is a plan view of a generator forming step according to an embodiment of the disclosed subject matter;
4 is a plan view of a mesh structure forming step according to an embodiment of the present disclosure;
5 is a plan view of a pore forming step according to an embodiment of the present disclosure;
6 is a graph of experimental results of the present disclosure.

Hereinafter, with reference to the accompanying drawings, a method for manufacturing a three-dimensional crystalline porous structure according to a preferred embodiment and a configuration, operation, and effect of a filter medium manufactured by the method will be described. For reference, in the following drawings, each component is omitted or schematically illustrated for convenience and clarity, and the size of each component does not reflect the actual size. In addition, the same reference numerals refer to the same components throughout the specification, and reference numerals for the same components in individual drawings will be omitted.

1 is a flowchart for a method for manufacturing a three-dimensional crystalline porous structure according to an embodiment of the disclosed subject matter.

As shown in Figure 1, the three-dimensional crystalline porous structure manufacturing method is a modeling step of forming a 3D model of the structure (S100), a conversion step of converting the 3D model formed in the modeling step (S100) into a Voronoi structure (S200) , an output step (S300) of outputting the Voronoi structure (Voronoi Diagram or Voronoi Tessellation) converted in the conversion step (S200) using a Fused Deposition Modeling (FDM) 3D printer.

The modeling step (S100) of forming a 3D model of the structure is a step of forming a 3D model of the structure having a desired shape (S100). Since the present invention manufactures a biological filter medium by forming internal crystalline pores regardless of shape, the shape and size of the model do not matter when forming a 3D model. Since the shape and size of the model do not matter, it can be combined with a customizable block-type filter medium. That is, the block-type filter medium has a structure that can be combined by a direct piling method and a fastening method (insulting). As a result, consumers can express their tastes in sculptures while considering the ecological characteristics of marine life inhabiting the tank.

The conversion step (S200) is a step of converting the 3D model formed in the modeling step (S100) into a three-dimensional crystalline porous structure by forming optimal pores using the Voronoi structure. In the transformation step (S200), the 3D model is divided into layers having a constant thickness to form pores, and the layer group forming step (S210) of forming a layer group by grouping three layers into a group, and deriving the center of gravity of each layer group and a generator forming step (S230) of generating points at equal intervals with the center of gravity as the origin, a mesh structure forming step (S250) of forming a triangle embracing the center of gravity, and a triangular mesh structure connecting adjacent points (S250), a triangular mesh A pore forming step (S270) of forming pores by forming a Voronoi structure around the forming points is included.

The algorithm of the conversion step S200 may be expressed as follows.

= sqrt(2Rd -

)로 하는 원점이 무게중심인 원이 있는 레이어 그룹의 나머지 두 층과 함께 포개어, 7μm ~ 50μm의 기공을 형성한다.
For other layers of a layer group
Form circle with

= sqrt(2Rd -

) and its center is MCP.
End For
EndInput: Slice of 3D Model (SM), Mass Center Point of Layer (MCP),
Distance L (L), Radius (R), Nozzle diameter (d)
Output : Number of Porous
Begin
// Form a layer group for pore formation
Form groups of layer which 3 layer in 1 set
// Create an equally spaced point with the center of gravity as the origin on one layer in the layer group
For each SMi
Find out PMC of each layer plane and scatter points with same distance (L) and
angle (60 degree)
End For

// Form a triangle mesh structure connecting the triangle with the origin (center of gravity of the face) and adjacent points.
Form Initial Triangle (IT) with a group of 3 points which can contain MCP in
its center
Form triangles with adjacent points of same distance (L) with IT

// Form a circle around the points that form the triangle mesh
For each vertex of triangle
Compute R (Radius) with L (Distance) and d (Nozzle diameter)
Create circles (radius = R) with each point. And each triangle contains a circle
with R
End For

// The layer has a radius

= sqrt(2Rd -

) is superimposed with the other two layers of the layer group with a circle whose origin is the center of gravity, forming pores of 7 μm to 50 μm.
For other layers of a layer group
Form circle with

= sqrt(2Rd -

) and its center is MCP.
End For
End

Finally, the output step ( S300 ) is a step of converting the 3D model having pores converted in the conversion step ( S200 ) into a G code and outputting it.

2 is a flowchart for a transformation step in a method for manufacturing a three-dimensional crystalline porous structure according to an embodiment of the disclosed subject matter, FIG. 3 is a plan view of a generator forming step (S230) according to an embodiment of the disclosed subject matter, and FIG. 4 is this view A plan view of the mesh structure forming step (S250) according to an embodiment of the disclosure, FIG. 5 is a plan view of the pore forming step (S270) according to an embodiment of the present disclosure.

2, 3, 4, 5, the conversion step (S200) is a layer group forming step (S210) of dividing the 3D model into layers having a constant thickness, and forming a layer group by grouping three layers into a group ), a generator forming step (S230) of deriving the center of gravity of the layer group and generating points with the same distance from the center of gravity as the origin, forming a triangle with the center of gravity, and forming a triangular mesh structure connecting adjacent points It characterized in that it comprises the forming step (S250), the pore forming step (S270) of forming pores by forming the Voronoi structure around the points forming the triangular mesh.

The layer group forming step ( S210 ) is a step of dividing the 3D model into layers having regular intervals and forming three layers into one group. The 3D model formed in the modeling step (S100) goes through a process of dividing all surfaces into small-sized triangles through a tessellation method. The contour data of the shape model can be extracted through the program, and the lines intersect each triangle constituting the shape model. At this time, the thickness of the layer [slice thickness] is equal to the thickness of the filament [filament thickness]. Also, the height [slicing plane Z_i] from the bottom of the nth layer becomes Z_min + [slice thickness]. If the height is greater than the minimum value of Z and less than the maximum value of Z, the triangle will interfere with the adjacent layer. In this way, if the following specifications are obtained, a total of 457 layers can be obtained when the slice thickness is set to 0.1.

X_max X_min Y_max Y_min Z_max Z_min 76 0.05 21 0.05 45 0.05

At this time, [slice thickness] is the same as the nozzle thickness of the 3D printer to be used in the output step (S300).

The generator forming step ( S230 ) is a step of deriving the center of gravity of each layer group and generating points with the same spacing with the center of gravity as the origin. The faces of each layer divided in the layer group formation step have the following center of gravity.

center of gravity G(x, y, z) =

The generator of the layer is composed with the corresponding center of gravity as the origin. The distance between each point and the angle between the points are:

The mesh structure forming step ( S250 ) is a step of forming a triangle having a center of gravity and forming a triangular mesh structure connecting adjacent points. Each layer forms a triangular mesh having the same area on the plane based on the generator generated in the generator forming step S230. Specifically, a triangular mesh structure is formed by connecting the generator formed in the above step to the point of the shortest distance based on the center of gravity.

The pore forming step ( S270 ) is a step of forming the pores by forming the Voronoi structure around the points forming the triangular mesh. A Voronoi diagram is formed based on three points of each triangular mesh formed in the mesh structure forming step S250 and the mesh center of gravity. Create an inscribed circle inside each diagram. If the radius of the formed inscribed circle is R, the distance L of each point and the radius of the inscribed circle are as follows.

를 따르고, 중심 레이어 상하로 존재하는 레이어는 반지름이

를 따른다. 이 중심 레이어와 상하레이어가 포개어져 7μm ~ 50μm의 기공을 형성한다.Based on each layer group formed in the layer group forming step (S210), the middle layer has a radius

, and the layers above and below the center layer have a radius

follow The central layer and the upper and lower layers are superimposed to form pores of 7 μm to 50 μm.

6 shows a graph of the experimental results of the present disclosure.

As shown in FIG. 6 , in the filter medium manufactured by the method for manufacturing a three-dimensional crystalline porous structure according to the present disclosure, it can be confirmed that the ammonia concentration is significantly lower than the initial ammonia concentration.

The Example and the control group showed the same ppm on the 1st, 7th, and 15th days, but on the 29th day, the Example showed 0,5ppm and the control group showed 0.6ppm, thereby confirming the clear effect of the present disclosure.

The experiment was carried out with the following comparative and experimental groups.

As a result of the experiment, there was no significant change in concentration until the first 15 days. However, it was confirmed that the ammonia concentration was significantly lower than the Reference (initial ammonia concentration) in the 7th measurement on the 29th day. That is, it was confirmed that the filtration ability of the prototype was superior to that of the control group through optimization and diversification of the pore size. The experimental results are summarized in a table as follows.

Although the preferred embodiment of the present invention has been described with reference to the accompanying drawings, the embodiments described in the present specification and the configuration shown in the drawings are only the most preferred embodiment of the present invention and represent all of the technical spirit of the present invention. Therefore, it should be understood that there may be various equivalents and modifications that can be substituted for them at the time of filing the present application. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the detailed description, and the meaning and scope of the claims and their All changes or modifications derived from the concept of equivalents should be construed as being included in the scope of the present invention.

S 100 ; modeling stage
S 200 ; conversion step
S 300 ; output stage
S 210 ; Layer group formation stage
S 230 ; Generator formation stage
S 250 ; Mesh structure formation stage
S 270 ; pore formation stage

Claims (4)

A modeling step of forming a 3D model of the structure;
a conversion step of converting the 3D model formed in the modeling step into a Voronoi structure;
An output step of outputting the Voronoi structure (Voronoi Diagram or Voronoi Tessellation) converted in the conversion step using a Fused Deposition Modeling (FDM) 3D printer;
The conversion step is
a layer group forming step of dividing the 3D model into layers having a constant thickness and forming a layer group by grouping three layers into a group;
a generator forming step of deriving the center of gravity of the layer group and generating points at equal intervals with the center of gravity as an origin;
a mesh structure forming step of forming a triangle embracing the center of gravity and forming a triangular mesh structure connecting adjacent points; and
A pore forming step of forming pores by forming a Voronoi structure around the points forming the triangular mesh;
In the layer group, the layers are provided at intervals of 0.01 to 0.05 mm, and in the generator forming step, dots are generated at 0.01 to 0.05 mm intervals, and in the pore forming step, the pores are formed in a size of 7 to 50 μm,
The thickness of the laminated filament output in the output step is the same as the layer thickness in the layer group forming step, the three-dimensional crystalline porous structure manufacturing method, characterized in that 0.01 ~ 0.05mm.
delete delete A modeling step of forming a 3D model of the structure;
a conversion step of converting the 3D model formed in the modeling step into a Voronoi structure;
An output step of outputting the Voronoi structure (Voronoi Diagram or Voronoi Tessellation) converted in the conversion step using a Fused Deposition Modeling (FDM) 3D printer;
The conversion step is
a layer group forming step of dividing the 3D model into layers having a constant thickness and forming a layer group by grouping three layers into a group;
a generator forming step of deriving the center of gravity of the layer group and generating points at equal intervals with the center of gravity as an origin;
a mesh structure forming step of forming a triangle embracing the center of gravity and forming a triangular mesh structure connecting adjacent points; and
A pore forming step of forming pores by forming a Voronoi structure around the points forming the triangular mesh;
In the layer group, the layers are provided at intervals of 0.01 to 0.05 mm, and in the generator forming step, points are generated at intervals of 0.01 to 0.05 mm, and in the pore forming step, the pores are formed in a size of 7 to 50 μm,
The thickness of the laminated filament output in the output step is identical to the layer thickness in the layer group forming step, and the filter medium, characterized in that it is manufactured by a three-dimensional crystalline porous structure manufacturing method comprising 0.01 ~ 0.05mm.

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