Device for producing three-dimensional net-like structure and method for producing three-dimensional net-like structure

Abstract

Provided is a device for producing a three-dimensional net-like structure that, with a simple configuration, is capable of efficiently producing even a complex shape. A production device (1) comprises: a nozzle (3) that has a plurality of extrusion holes (31) and that extrudes a thermoplastic resin in a molten state downward and causes the thermoplastic resin to descend as a filament aggregate (40) composed of a plurality of filaments (41); a water tank (5) that is disposed below the nozzle (3) and cools the filament aggregate (40); a pair of take-up machines (6a, 6b) that conveys the filament aggregate (40) in water; and molded sheets (8a, 8b) that are attached to the pair of take-up machines (6a, 6b) and include, on the surfaces thereof, molded portions (81a, 81b) each having a three-dimensional shape.

Description

Manufacturing Apparatus for Three-Dimensional Network Structure and Manufacturing Method for Three-Dimensional Network Structure 【0001】 The present invention relates to a manufacturing apparatus for a three-dimensional network structure used for a cushion body or the like, and a manufacturing method for a three-dimensional network structure. 【0002】 Conventionally, three-dimensional network structures have been used as cushion bodies used for mattresses, floor mats, seat cushions, and the like. In recent years, due to diversification of uses and required performances, there has been an increasing need to manufacture three-dimensional network structures in various shapes. 【0003】 Patent Document 1 discloses a die that extrudes a linear aggregate made of molten resin from an extrusion hole, a chute that slopes downward toward the linear aggregate below the die, and a take-up machine disposed below the chute, and discloses that a three-dimensional network structure having an arbitrary cross-sectional shape can be formed depending on the shape of the chute. 【0004】 Patent Document 2 discloses a linearizing section that extrudes a molten resin, a cooling tank, a guiding section, a guiding section that guides a structure formed by cooling the resin toward the bottom surface of the cooling tank, and a concavo-convex forming rotating section that is disposed in the cooling tank above the guiding section and below the guiding section and forms concavities and convexities on the structure by contacting the structure while rotating with concavities and convexities on the surface, for a manufacturing apparatus for a network structure. 【0005】 Patent Document 3 discloses that a network structure having concavities and convexities formed on its surface is manufactured by post-processing with a hot plate or by attaching concavo-convex parts to a take-up device. 【0006】 Japanese Patent No. 5868964 Japanese Unexamined Patent Application Publication No. 2023-126156 Japanese Patent No. 7562178 【0007】 In Patent Document 1, although the cross-sectional shape perpendicular to the extrusion direction can be formed into an arbitrary shape, only the same shape can be formed in the extrusion direction, and a complex shape cannot be formed. Patent Documents 2 and 3 have problems in that the number of parts of the manufacturing apparatus is large, the apparatus becomes complicated, and the work involved in changing the presence or absence of concavities and convexities is cumbersome. Also, in Patent Document 3, if concavities and convexities are formed by post-processing, there is a problem in that the number of steps increases and the work becomes complicated. 【0008】 In view of the above-mentioned conventional problems, the present invention provides a manufacturing apparatus and manufacturing method for a three-dimensional mesh structure that can efficiently manufacture even complex three-dimensional mesh structures with a simple structure. 【0009】 The present invention is a manufacturing apparatus for a three-dimensional mesh structure, comprising: a nozzle having a plurality of extrusion holes for extruding and lowering a molten thermoplastic resin as a linear assembly consisting of a plurality of threads; a water tank positioned below the nozzle for cooling the linear assembly; a pair of take-up machines for transporting the linear assembly underwater in the water tank; and a molded sheet attached to at least one of the pair of take-up machines, having a three-dimensional molded portion on its surface. 【0010】 The molded sheet is preferably in an endless shape. 【0011】 The aforementioned pull-up machine is an endless member in which multiple horizontally elongated plate materials are connected vertically, and it is preferable that the molded sheet is attached to the plate materials by an attachment member. 【0012】 The molded sheet is preferably made of an extensible material. 【0013】 Preferably, the molded sheet comprises an endless sheet body, a convex portion projecting in the thickness direction from the sheet body portion in the circumferential direction of the molded sheet, and a bottom portion that is lower in height than the top of the convex portion. 【0014】 Preferably, the molded sheet has multiple water-conducting holes. 【0015】 Preferably, the molding section has a first molding section and a second molding section, the first molding section molds a first side surface parallel to the extrusion direction of the filament assembly, and the second molding section molds a second side surface parallel to the extrusion direction of the filament assembly and perpendicular to the first side surface. 【0016】The present invention is a method for manufacturing a three-dimensional mesh structure, comprising: an attachment step of attaching a molded sheet having a three-dimensional molded portion on its surface to at least one of a pair of take-up machines; an extrusion step of extruding a heated and molten thermoplastic resin as a linear assembly consisting of multiple filaments from a nozzle having a plurality of extrusion holes; and a molding step of transporting the linear assembly in a water tank to cool and solidify while bringing the linear assembly into contact with the molded sheet before solidification using the pair of take-up machines. 【0017】 In the molding process, it is preferable to form a protrusion on the surface of the linear aggregate that protrudes in the thickness direction and a bottom portion that is lower in height than the top portion of the protrusion using the molded sheet. 【0018】 In the molding process, it is preferable to form the thick and thin portions of the linear assembly using the molded sheet. 【0019】 The molded sheet is preferably made of an extensible material. 【0020】 Preferably, the molded sheet has multiple water-conducting holes. 【0021】 According to this invention, even complex shapes can be manufactured efficiently with a simple structure. Post-processing is reduced, and raw material loss during the manufacturing process is also minimized. Furthermore, it is possible to retrofit the molded sheet to existing manufacturing equipment, and by changing the molded sheet, it is possible to accommodate various shapes. 【0022】 This is a schematic diagram showing a side view of the manufacturing apparatus for a three-dimensional mesh structure according to the first embodiment in use. This is a plan view illustrating a take-up machine to which a molded sheet is attached in the same embodiment. This is a cross-sectional view of a part of a molded sheet in the same embodiment. This is an example of a three-dimensional mesh structure manufactured with the manufacturing apparatus of the same embodiment, where (A) is in use and (B) is in the state after molding. This is a schematic diagram showing a side view of a take-up machine to which a molded sheet is attached in a modified example. This is a view taken along the line C-C' in Figure 5. This is a schematic diagram showing a side view of the manufacturing apparatus for a three-dimensional mesh structure according to the second embodiment in use. 【0023】Referring to Figures 1 to 4, the manufacturing apparatus 1 for a three-dimensional mesh structure according to the first embodiment will be described. Note that the embodiments shown below are examples of the present invention, and the present invention is not limited to these embodiments. 【0024】 The manufacturing apparatus 1 manufactures a three-dimensional mesh structure 2, which is formed by bending and twisting strands of thermoplastic resin to form random loops, and joining the loops by contacting each other in a molten state. The manufacturing apparatus 1 includes a nozzle 3 that pushes and lowers molten thermoplastic resin downward as a strand assembly 40 consisting of a plurality of strands 41, a water tank 5 positioned below the nozzle 3 to cool the strand assembly 40, at least a pair of take-up machines 6a, 6b that transport the strand assembly 40 in water in contact with it in the water tank 5, and molded sheets 8a, 8b attached to the pair of take-up machines 6a, 6b, each having three-dimensional molded parts 81a, 81b on its surface. 【0025】 The nozzle 3 has a plurality of extrusion holes 31 and is integrally provided at the bottom of a die (not shown) that applies pressure to molten thermoplastic resin and temporarily stores it. Molten resin is discharged from each extrusion hole 31 as a filament 41, and a filament assembly 40 descends. The diameter of the filament 41 extruded by the extrusion holes 31 is exemplified as 0.1 to 3 mm for solid filaments and 0.2 to 5 mm for hollow or irregularly shaped filaments. 【0026】 Examples of thermoplastic resins used as raw materials include polyethylene, polyolefins such as polypropylene, polyesters such as polyethylene terephthalate, polyamides such as nylon 66, polyvinyl chloride, polystyrene, copolymers and elastomers obtained by copolymerizing the above resins, and blends of the above resins. Antibacterial agents, non-combustible materials, and flame retardants can be mixed into the thermoplastic synthetic resin raw material, and biodegradable plastics can also be used. 【0027】A water tank 5 positioned below the nozzle 3 is configured to receive the filament assembly 40 extruded from the nozzle 3 and contains water W for cooling the filament assembly 40. Take-up machines 6a and 6b, partially or completely submerged, are placed in the water tank 5. The resin filaments extruded from the extrusion hole 31 of the nozzle 3 land on the water surface in the water tank 5 and bend, forming random loops, which then come into contact with adjacent random loops in a molten state. 【0028】 Between the take-up machines 6a and 6b, the wire assembly 40 is formed, cooled and solidified, and then conveyed. The take-up machines 6a and 6b are endless conveyors, each equipped with endless members 61a and 61b and rotating bodies such as sprockets 62a and 62b that drive the endless members 61a and 61b. The endless members 61a and 61b are each composed of multiple horizontally elongated plate materials 68 connected vertically by multiple (two in this case) endless chains (not shown) with a predetermined gap R between them. As shown in Figure 1, the take-up machines 6a and 6b are equipped with upper drive shafts 64a and 64b and lower drive shafts 65a and 65b, which are pivotally supported between frames (not shown). Upper drive shafts 64a, 64b and lower drive shafts 65a, 65b are each provided with upper sprockets 62a, 62b and lower sprockets 63a, 63b at corresponding intervals, and an endless chain is installed around the upper sprockets 62a, 62b and lower sprockets 63a, 63b under tension. 【0029】 The pullers 6a and 6b are further equipped with a drive control device (not shown) consisting of a drive motor, drive chain, various gears, transmission, control device, and other instruments, which applies rotational driving force to the upper drive shafts 64a and 64b. This rotational driving force is simultaneously transmitted to the lower drive shafts 65a and 65b, causing the upper drive shafts 64a and 64b and the lower drive shafts 65a and 65b to rotate synchronously. Accordingly, the sprocket, endless chain, and endless member also rotate at a constant speed. 【0030】The distance between the take-up machines 6a and 6b is preferably set to be the same as or narrower than the width of the extruded wire assembly. It is preferable to allow the wire assembly to descend naturally between the take-up machines 6a and 6b, and to pull in the wires at a speed slower than the descent speed. A spacing adjustment mechanism may be provided to allow adjustment of the distance between the pair of endless members 61a and 61b. 【0031】 The endless members 61a and 61b are not limited to those described above, and may also be conveyors made of flat belts made of rubber or resin, or net conveyors made of metal wires that are continuously woven or interwoven to form a mesh. 【0032】 The molded sheets 8a and 8b are annular (endless shape) and cover the entire circumference of the area of ​​the take-up machines 6a and 6b that is in contact with the filament assembly. However, the present invention is not limited to this, and any configuration in which the molded sheets are attached to at least a portion of at least one of the take-up machines 6a and 6b is included within the technical scope of the present invention. For example, the molded sheet 8a may be attached only to the take-up machine 6a, and the molded sheet 8b may not be attached to the take-up machine 6b. Alternatively, the molded sheets 8a and 8b may be attached only to a portion of the area in contact with the filament assembly. In this embodiment, when the molded sheets 8a and 8b are attached to the take-up machines 6a and 6b, three-dimensional molded portions 81a and 81b are formed on the surface opposite to the take-up machine, i.e., the surface in contact with the filament assembly 40. 【0033】 As shown in Figure 3, the molded sheets 8a and 8b may comprise an endless sheet body 83, a protrusion 84 projecting in the thickness direction from the sheet body on the outer circumferential surface of the molded sheet, and a bottom portion 85 lower in height than the top of the protrusion 84. The protrusion 84 may be manufactured integrally with the sheet body 83, or the protrusion 84 may be attached to a flat sheet body 83. The thickness of the molded sheets 8a and 8b is exemplified to be 5 to 500 mm. 【0034】The molding sections 81a and 81b have a first molding section X that forms the shape of the side surface in a first direction (longitudinal side surface in this embodiment) parallel to the extrusion direction of the filament assembly, and a second molding section Y that forms the shape of the side surface in a second direction (short side surface in this embodiment) parallel to the extrusion direction and perpendicular to the first direction. The molding sheets 8a and 8b may have both the first molding section X and the second molding section Y, or they may have only one of the first molding section X or the second molding section Y. The side surface in the second direction may be curved or flat, as shown in Figure 2. The filament assembly is molded while being held between the molding sections 81a and 81b, and simultaneously cooled and solidified in a water tank, thereby obtaining a three-dimensional mesh structure with a shape corresponding to the molding sections 81a and 81b. If the molding sheet 8a is attached only to the take-up machine 6a, for example, a three-dimensional mesh structure with an uneven top surface and a flat bottom surface can be obtained. 【0035】 The shape of the molding sections 81a and 81b is not limited, but examples include staggered arrangements of bumps and grooves as shown in Figures 1 to 3, or wave-shaped bumps and grooves. This makes it possible to form a three-dimensional mesh structure with bumps and grooves on the surface. Furthermore, the molding sections 81a and 81b can form thick and thin sections of the three-dimensional mesh structure 2, allowing for the integral molding of a reclining seat, such as the one shown in Figure 4. The reclining seat in Figure 4 has thick sections 21, 23, and 25, a thin section 27, and bent sections 22, 24, and 26 in the extrusion direction, and these can be manufactured integrally. The bent sections 22, 24, and 26 are made easier to bend by reducing their thickness. In addition, by adjusting the rotation speed of the take-up machines 6a and 6b and the filament extrusion speed from the nozzle 3, the bulk density can be adjusted to create partially hard or soft cushioning material. For example, the thick section 23 that forms the back support can be molded to be soft, and the thick section 25 that forms the seat surface can be molded to be hard. 【0036】 By combining the first molding section X and the second molding section Y, it becomes possible to mold curved ends as well. In this way, by bringing the entire circumferential surface of the linear assembly, perpendicular to the extrusion direction, into contact with the molded sheets 8a and 8b, all longitudinal and transverse sides can be molded, reducing the amount of post-processing required. 【0037】The molded sheets 8a and 8b are preferably made of an extensible material such as rubber, silicone, or elastomer. This allows the molded sheets 8a and 8b to adhere closely to the take-up machines 6a and 6b, and the molded sheets 8a and 8b do not bend or flex during the manufacturing process, following the take-up machines 6a and 6b, so that the shape of the three-dimensional mesh structure 2 corresponding to the molded parts 81a and 81b can be formed. 【0038】 The molded sheets 8a and 8b may have a plurality of water passage holes (not shown). The shape of the water passage holes is not limited and includes, for example, circular or slit-shaped holes. If the water passage holes are circular, the diameter of the water passage holes is exemplified to be 5 to 200 mm. The water passage holes can prevent the temperature inside the take-up machine from rising. The water passage holes can also enhance the cooling effect inside the water tank 5. A cooling water spraying device may be provided in the internal region I to create a water flow to the water passage holes. 【0039】 The manufacturing apparatus 1 does not have a chute like in the conventional technology (a member positioned below the nozzle and above the water tank, with an inclined surface that contacts the filament and guides it to the cooling tank), and it is preferable that the filament assembly 40 extruded from the nozzle 3 directly contacts the take-up machines 6a and 6b in the water tank 5. If the filament assembly 40 contacts the chute before contacting the take-up machines 6a and 6b, the surface portion will solidify on the chute surface, and the height of the irregularities that can be formed afterward will be reduced. By not having a chute and having the filament assembly 40 directly contact the molding section 81a and 81b before solidification, it becomes easier to mold even irregularities with height. 【0040】 According to this embodiment, the shape can be freely changed not only in the width and thickness directions, but also in the extrusion direction. This reduces post-processing and minimizes raw material loss during molding. Furthermore, by simply attaching a sheet to an existing take-up machine, various shapes of three-dimensional mesh structures can be easily formed. 【0041】Figs. 5 and 6 are diagrams for explaining a modified example of the forming sheets 8a and 8b. The forming sheet 8a does not have an endless shape, but includes a plurality (three in this embodiment) of forming sheets 8a1, 8a2, and 8a3. Similarly, the forming sheet 8b includes three forming sheets 8b1, 8b2, and 8b3. Each forming sheet is attached to corresponding portions of the plate material 68 of the endless members 61a and 61b at its upper and lower ends by screws 92 or the like via a pressing plate 91. The pressing plate 91 has a horizontally long shape and is attached substantially parallel to the plate material 68. The forming sheets 8a1, 8a2, 8a3, 8b1, 8b2, and 8b3 may have the same shape or different shapes, and can be freely designed according to the shape of the target three-dimensional network structure. Also, the forming sheets may be attached only to a part of the entire circumference of the endless members 61a and 61b. 【0042】 Hereinafter, the manufacturing method of the three-dimensional network structure in this embodiment will be described. For known components, detailed descriptions thereof will be omitted, so refer to Japanese Patent No. 4350286, U.S. Patent No. 7,625,629, etc. 【0043】 First, the above-mentioned forming sheets 8a and 8b are attached to a pair of take-up machines 6a and 6b. At this time, since the forming sheets 8a and 8b are made of stretchable materials, the forming sheets 8a and 8b can be stretched and fitted into the take-up machines 6a and 6b, and can be attached to the take-up machines 6a and 6b with good adhesion. 【0044】 Next, a raw material mainly composed of a thermoplastic synthetic resin is melted. The melted raw material is pressurized and extruded downward from the extrusion holes 31 of the nozzle 3 to form a strip 41. The temperature range inside the nozzle 3 can be set to 100 - 400°C, the extrusion amount can be set to 20 - 200 Kg / hour, etc. Each strip 41 discharged from the nozzle 3 becomes a strip aggregate 40 composed of a plurality of strips 41 due to the arrangement of a plurality of extrusion holes 31. 【0045】The wire aggregate 40 lands on the water surface in the water tank 5. Here, since the take-up speeds of the take-up machines 6a and 6b are slower than the falling speed of the wire aggregate, the landed wires bend and become intertwined in a loop shape near the water surface. At the same time, the wires located on the outer peripheral side of the wire aggregate are in a state where they have not yet solidified (a state where the shape can be deformed at high temperature), come into contact with the forming sheets 8a and 8b attached to the pair of take-up machines 6a and 6b, become intertwined in a loop shape, and are sandwiched between the take-up machines 6a and 6b while being formed by the forming portions 81a and 81b of the forming sheets 8a and 8b, cooled and solidified, and then conveyed. Depending on the shape of the forming portions of the forming sheets 8a and 8b, convex portions protruding in the thickness direction and bottoms having a lower height than the tops of the convex portions can be formed on the surface of the wire aggregate. 【0046】 By continuously performing the above operations, pulling out the cooled and solidified wire aggregate 40 from the water tank and cutting it to a desired length, the three-dimensional network structure 2 can be obtained. 【0047】 Next, referring to FIG. 7, the manufacturing apparatus 101 of the second embodiment will be described. Since this manufacturing apparatus 101 basically has the same configuration as the manufacturing apparatus 1, the common descriptions will refer to the illustration and description of the first embodiment, and the differences will be described. The reference numerals attached to each element are the corresponding numbers of the first embodiment with a 100s prefix. 【0048】 In the second embodiment, as take-up machines, a pair of first rolls 166a and 166b installed horizontally at a predetermined interval, a pair of second rolls 167a and 167b arranged in alignment with and horizontally at a predetermined interval below the pair of first rolls 166a and 166b, a drive motor for driving the rolls 166a, 166b, 167a, and 167b, a chain and gears, and a speed changer for changing the rotational speeds of the rolls 166a, 166b, 167a, and 167b, a control device, etc. are provided. The rolls 166a, 166b, 167a, and 167b have a circular cross-sectional shape and are each provided with drive shafts 164a, 164b, 165a, and 165b. The drive shafts 164a, 164b, 165a, and 165b are rotatably supported by their respective bearings and are each driven in the direction of the arrow in FIG. 5 by a drive motor via a speed changer. 【0049】 A sheet 108a, with a three-dimensional molded portion 181a formed on it, is stretched between the first roll 166a and the second roll 167a. The sheet 108a rotates in the direction of the arrow in Figure 7, as the rotation of the first roll 166a and the second roll 167a is transmitted to it. The sheet 108a may be made of a non-stretchable material in addition to an extensible material as in the first embodiment. The surface of the sheet 108a on the roll side and the roll surface may be given an anti-slip function depending on the shape and material. Similarly, a sheet 108b with a three-dimensional molded portion 181b formed on it is stretched between the other first roll 166b and the second roll 167b. 【0050】 The internal region I of sheets 108a and 108b is provided with guides 110 that restrict the deflection of sheets 108a and 108b. In the second embodiment, the sheet is prone to denting in the center of the straight section, but the guides 110 help to suppress denting and maintain the clamping force. The guides 110 extend in a longitudinal direction parallel to the extrusion direction, at least on the side of the internal region I that is in contact with the linear assembly 140. The molded sheets 108a and 108b are arranged in a long oval shape in a side view and have two straight sections, and the guides 110 are provided in their internal region I. In Figure 7, the guides 110 are provided on both the side in contact with the assembly 140 and the opposite side, but it is also possible to provide the guides 110 only on the straight section on the side through which the assembly 140 passes. Examples of guides 110 include rod-shaped and flat bar-shaped designs. The internal region I refers to the internal region separated by the molded sheets 108a and 108b. 【0051】 As shown in Figure 7, the guide 110 is fixed to the upper frame 111 and lower frame 112, which extend laterally in the internal region I, and is provided to slide against the molded sheet 108. One or more guides 110 are provided in the extending direction of the rolls 166a, 166b, 167a, and 167b. In this embodiment, the guide 110 is made of a hard resin, but depending on the elements of the above manufacturing, metal, ceramics, carbon fiber, or composite materials may be used. 【0052】The three-dimensional mesh structure produced by the manufacturing apparatus or method of the present invention can be used as a cushioning material in reclining seats, chairs, seat cushions, nursing care chairs, mattresses, futons, sofas, and the like. 【0053】 The present invention is not limited to the embodiments described above, and various modifications, substitutions, deletions, etc., can be made without departing from the technical spirit of the present invention, and modifications, equivalents, substitutions, deletions, etc., are also included in the technical scope of the present invention. 【0054】 1, 101: Manufacturing apparatus for three-dimensional mesh structures 2: Three-dimensional mesh structure 3, 103: Nozzle 31, 131: Extrusion hole 5, 105: Water tank 6a, 6b, 106a, 106b: Take-up machine 61a, 61b: Endless member 62a, 62b: Upper sprocket 63a, 63b: Lower sprocket 64a, 64b, 164a, 164b: Upper drive shaft 65a, 65b, 165a, 165b: Lower drive shaft 68: Plate material 8a, 8b, 108a, 108b: Molded sheet 81a, 81b, 181a, 181b: Molding section 110: Guide 111: Upper frame 112: Lower frame 166a, 166b: First roll 167a, 167b: Second roll

Claims

1. A manufacturing apparatus for a three-dimensional mesh structure comprising: a nozzle having multiple extrusion holes for extruding and lowering molten thermoplastic resin downward as a linear assembly consisting of multiple filaments; a water tank positioned below the nozzle for cooling the linear assembly; a pair of take-up machines for transporting the linear assembly underwater in the water tank; and a molded sheet attached to at least one of the pair of take-up machines, having a three-dimensional molded portion on its surface.

2. The apparatus for manufacturing a three-dimensional mesh structure according to claim 1, wherein the molded sheet is in an endless shape.

3. The apparatus for manufacturing a three-dimensional mesh structure according to claim 1 or 2, wherein the take-up machine is an endless member in which a plurality of horizontally elongated plate materials are connected vertically, and the molded sheet is attached to the plate materials by an attachment member.

4. The apparatus for manufacturing a three-dimensional mesh structure according to any one of claims 1 to 3, wherein the molded sheet is made of an extensible material.

5. The apparatus for manufacturing a three-dimensional mesh structure according to any one of claims 1 to 4, wherein the molded sheet comprises an endless sheet body, a convex portion projecting in the thickness direction from the sheet body portion in the circumferential direction of the molded sheet, and a bottom portion that is lower in height than the top of the convex portion.

6. The apparatus for manufacturing a three-dimensional mesh structure according to any one of claims 1 to 5, wherein a plurality of water-conducting holes are formed in the molded sheet.

7. The apparatus for manufacturing a three-dimensional mesh structure according to any one of claims 1 to 6, wherein the molding section comprises a first molding section and a second molding section, the first molding section molds a first side surface parallel to the extrusion direction of the linear assembly, and the second molding section molds a second side surface parallel to the extrusion direction of the linear assembly and perpendicular to the first side surface.

8. A method for manufacturing a three-dimensional mesh structure, comprising: an attachment step of attaching a molded sheet having a three-dimensional molded portion on its surface to at least one of a pair of take-up machines; an extrusion step of extruding a heated and molten thermoplastic resin as a linear assembly consisting of multiple filaments from a nozzle having a plurality of extrusion holes; and a molding step of transporting the linear assembly in a water tank to cool and solidify while bringing the linear assembly into contact with the molded sheet before solidification using the pair of take-up machines.

9. The method for manufacturing a three-dimensional mesh structure according to claim 8, wherein in the molding step, the molded sheet forms a protrusion on the surface of the linear aggregate that protrudes in the thickness direction and a bottom that is lower in height than the top of the protrusion.

10. The method for manufacturing a three-dimensional mesh structure according to claim 8, wherein, in the molding step, the molded sheet is used to form a thick portion and a thin portion of the linear aggregate.

11. The method for manufacturing a three-dimensional mesh structure according to any one of claims 8 to 10, wherein the molded sheet is made of an extensible material.

12. The method for manufacturing a three-dimensional mesh structure according to any one of claims 8 to 11, wherein a plurality of water-conducting holes are formed in the molded sheet.

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