Apparatus for manufacturing a three-dimensional network structure and method for manufacturing a three-dimensional network structure

Abstract

Provided are a manufacturing apparatus and a manufacturing method for a three-dimensional network structure that has a simple structure and can efficiently manufacture even a complex shape. 【Solution means】 A manufacturing apparatus 1 for a three-dimensional network structure, comprising: a nozzle 3 that has a plurality of extrusion holes 31 and extrudes a molten thermoplastic resin downward as an aggregate 40 of filaments composed of a plurality of filaments 41 and causes it to descend; a water tank 5 that is disposed below the nozzle 3 and cools the aggregate 40 of filaments; a pair of take-up machines 6a, 6b that convey the aggregate 40 of filaments in water in the water tank 5; and forming sheets 8a, 8b that are attached to the pair of take-up machines 6a, 6b and have three-dimensional shaped forming portions 81a, 81b on their surfaces.

Description

Technical Field

[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 method for manufacturing a three-dimensional network structure.

Background Art

[0002] Conventionally, three-dimensional network structures have been used as cushion bodies for use in mattresses, floor mats, seat cushions, etc. In recent years, due to the diversification of applications 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 resin in a molten state, 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 an unevenness forming rotating section that is disposed in the cooling tank above the guiding section and below the guiding section and that forms unevenness on the structure by coming into contact with the structure while rotating with unevenness on the surface.

[0005] Patent Document 3 discloses that a network structure having unevenness formed on its surface is manufactured by post-processing with a hot plate or by attaching uneven parts to a take-up device.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] In Patent Document 1, the cross-sectional shape perpendicular to the extrusion direction can be formed into any shape, but 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 unevenness is complicated. Further, in Patent Document 3, if unevenness is formed by post-processing, there is a problem that the number of steps increases and the work becomes complicated.

[0008] In view of the above conventional problems, the present invention provides a manufacturing apparatus and a manufacturing method for a three-dimensional network structure body that have a simple structure and can efficiently manufacture a three-dimensional network structure body with a complex shape.

Means for Solving the Problems

[0009] The present invention includes a nozzle having a plurality of extrusion holes, for extruding and dropping a molten thermoplastic resin downward as an aggregate of strands composed of a plurality of strands, a water tank disposed below the nozzle for cooling the aggregate of strands, a pair of take-up machines for transporting the aggregate of strands in water in the water tank, and a forming sheet attached to at least one of the pair of take-up machines and having a three-dimensional shaped portion on the surface, which is a manufacturing apparatus for a three-dimensional network structure body.

[0010] The forming sheet is preferably endless.

[0011] The take-up machine is an endless member in which a plurality of plate materials long in the lateral direction are connected in the longitudinal direction having , and the forming sheet is preferably attached to the plate material by an attachment member.

[0012] The forming sheet is preferably made of a stretchable material.

[0013] The formed sheet preferably includes an endless sheet body, a convex portion protruding in the thickness direction in the circumferential direction of the formed sheet, and a bottom portion having a height lower than the top of the convex portion. body or The formed sheet preferably has a plurality of water passing holes formed therein.

[0014] The forming portion preferably has a first forming portion and a second forming portion. The first forming portion forms a first side surface parallel to the extrusion direction of the linear aggregate, and the second forming portion forms a second side surface parallel to the extrusion direction of the linear aggregate and perpendicular to the first side surface.

[0015] The present invention provides a method for manufacturing a three-dimensional network structure, comprising: an attachment step of attaching a formed sheet having a three-dimensional shaped forming portion on the surface to at least one of a pair of take-up machines; an extrusion step of extruding a heat-melted thermoplastic resin as a linear aggregate composed of a plurality of linear strips from a nozzle having a plurality of extrusion holes; and a forming step of conveying the linear aggregate in a water tank while bringing the linear aggregate before solidification into contact with the formed sheet for forming and cooling and solidifying the linear aggregate.

[0016] The forming sheet is preferably endless and made of an extensible material. Further, the take-up machine has an endless member in which a plurality of laterally long plate materials are longitudinally connected, and the forming sheet is preferably made of an extensible material. Further, it is preferable that a plurality of water passing holes are formed in the forming sheet.

[0017] In the forming step, it is preferable to form, by the formed sheet, a convex portion protruding in the thickness direction and a bottom portion having a height lower than the top of the convex portion on the surface of the linear aggregate.

[0018] In the forming step, it is preferable to form, by the formed sheet, a thick portion and a thin portion of the linear aggregate.

Advantages of the Invention

[0019] ​According to the present invention, it has a simple structure and can be efficiently manufactured even with complex shapes. It can reduce post-processing and raw material loss during the manufacturing process. Also, it is possible to attach a forming sheet to an existing manufacturing apparatus as a retrofit, and by changing the forming sheet, it can accommodate various shapes.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

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Figure 6

Figure 7

[0021] Referring to FIGS. 1 to 4, the manufacturing apparatus 1 for a three-dimensional network structure of the first embodiment will be described. Note that each of the following embodiments is an example of the present invention, and the present invention is not limited to the following embodiments.

[0022] The manufacturing apparatus 1 manufactures a three-dimensional network structure 2. The three-dimensional network structure 2 is formed by bending a resin strip made of a thermoplastic resin to form random loops, and the loops are joined by contacting each other in a molten state. The manufacturing apparatus 1 includes a nozzle 3 that extrudes and descends a molten thermoplastic resin downward as a strip aggregate 40 composed of a plurality of strips 41, a water tank 5 disposed below the nozzle 3 for cooling the strip aggregate 40, at least a pair of take-up machines 6a and 6b that convey the strip aggregate 40 in water in contact with the strip aggregate 40 in the water tank 5, and forming sheets 8a and 8b having three-dimensional shaped forming portions 81a and 81b on the surface, which are attached to the pair of take-up machines 6a and 6b.

[0023] The nozzle 3 has a plurality of extrusion holes 31 and is integrally provided at the lower part of a die (not shown) that applies pressure to the molten thermoplastic resin and temporarily stores it. The molten resin is discharged as strips 41 from the respective extrusion holes 31, and the strip aggregate 40 descends. The diameter of the strip 41 extruded by the extrusion holes 31 is exemplified as 0.1 to 3 mm in the case of solid, and 0.2 to 5 mm in the case of hollow or irregular shape.

[0024] Examples of the thermoplastic resin used as the raw material include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polyamides such as nylon 66, polyvinyl chloride, polystyrene, copolymers and elastomers copolymerized based on the above resins, and blends of the above resins. It is also possible to use a mixture of an antibacterial agent, a non-combustible material, or a flame retardant in the raw material thermoplastic synthetic resin, or a biodegradable plastic.

[0025] The water tank 5 disposed below the nozzle 3 is arranged to receive the strip aggregate 40 extruded from the nozzle 3 and has water W for cooling the strip aggregate 40. In the water tank 5, the take-up machines 6a and 6b partially or entirely submerged are arranged. The resin of the strip extruded from the extrusion holes 31 of the nozzle 3 touches the water surface in the water tank 5 and forms random loops by bending and twisting, and adjacent random loops contact each other in a molten state.

[0026] The strand assembly 40 is formed, cooled and solidified, and conveyed between the take-up machines 6a and 6b. The take-up machines 6a and 6b are endless conveyors, each including endless members 61a and 61b and rotating bodies such as sprockets 62a and 62b for driving the endless members 61a and 61b. The endless members 61a and 61b are each configured by a plurality of longitudinally long plate members 68 arranged in the lateral direction with a predetermined gap R therebetween and connected longitudinally by a plurality (here, two each) of endless chains (not shown). As shown in FIG. 1, the take-up machines 6a and 6b include upper drive shafts 64a and 64b and lower drive shafts 65a and 65b, which are rotatably supported between frames (not shown). Upper sprockets 62a and 62b and lower sprockets 63a and 63b are provided on the upper drive shafts 64a and 64b and the lower drive shafts 65a and 65b at corresponding intervals, respectively, and the endless chains are wound around the upper sprockets 62a and 62b and the lower sprockets 63a and 63b under tension.

[0027] The take-up machines 6a and 6b further include a drive control device (not shown) composed of a drive motor, a drive chain, various gears, a transmission, a control device, and other instruments, etc., by which a rotational driving force is applied to the upper drive shafts 64a and 64b. This rotational driving force is simultaneously transmitted to the lower drive shafts 65a and 65b, and the upper drive shafts 64a and 64b and the lower drive shafts 65a and 65b rotate synchronously. Accordingly, the sprockets, the endless chains, and the endless members also rotate at a constant speed.

[0028] The opposing interval between the take-up machines 6a and 6b is preferably set to be the same as the width of the extruded strand assembly or narrower than the width of the strand assembly. It is preferable to let the strand assembly naturally drop between the take-up machines 6a and 6b and draw in the strands slower than the dropping speed. An interval adjustment mechanism for making the opposing interval between the pair of endless members 61a and 61b adjustable may be provided.

[0029] Note that the endless members 61a and 61b are not limited to the above, and may be a conveyor made of a flat belt made of rubber or resin, or a net conveyor formed into a mesh shape by continuously knitting or weaving metal wires.

[0030] The forming sheets 8a and 8b are annular (endless) and cover the entire circumference of the region in contact with the wire aggregate among the take-up machines 6a and 6b. However, the present invention is not limited to this, and any object attached to at least a part of at least one of the take-up machines 6a and 6b is included in the technical scope of the present invention. For example, a form in which the forming sheet 8a is attached only to the take-up machine 6a and the forming sheet 8b is not attached to the take-up machine 6b may be used. Also, a form in which the forming sheets 8a and 8b are attached only to a part of the region in contact with the wire aggregate may be used. In the present embodiment, the forming sheets 8a and 8b have three-dimensional shaped forming portions 81a and 81b formed on the surface on the side opposite to the take-up machine, that is, the surface in contact with the wire aggregate 40, when attached to the take-up machines 6a and 6b.

[0031] As shown in FIG. 3, the forming sheets 8a and 8b can include an endless sheet body 83, a convex portion 84 protruding in the thickness direction from the sheet body portion in the circumferential direction of the outer peripheral surface of the forming sheet, and a bottom portion 85 having a lower height than the top of the convex portion 84. The convex portion 84 may be integrally manufactured with the sheet body 83, or the convex portion 84 may be attached to the flat sheet body 83. The thickness of the forming sheets 8a and 8b is exemplified as 5 to 500 mm.

[0032] The forming parts 81a and 81b include a first forming part X that forms the shape of the side surface in the first direction (the longitudinal side surface in this embodiment) parallel to the extrusion direction of the strip aggregate, and a second forming part Y that forms the shape of the side surface in the second direction (the short side surface in this embodiment) parallel to the extrusion direction and perpendicular to the first direction. The forming sheets 8a and 8b may have only one of the first forming part X or the second forming part Y. The side surface in the second direction may be curved or flat as shown in FIG. 2. The strip aggregate is formed while being sandwiched between the forming parts 81a and 81b, and at the same time is cooled and solidified in the water tank, so that a three-dimensional network structure having a shape corresponding to the forming parts 81a and 81b can be obtained. When the forming sheet 8a is attached only to the take-up machine 6a, for example, a three-dimensional network structure having an uneven upper surface and a flat lower surface can be obtained.

[0033] The shapes of the forming parts 81a and 81b are not limited, and examples include unevenness arranged in a staggered pattern and corrugated unevenness as shown in FIGS. 1 to 3. Thereby, a three-dimensional network structure with unevenness on the surface can be formed. Further, the forming parts 81a and 81b form thick and thin portions of the three-dimensional network structure 2, and for example, a reclining sheet as shown in FIG. 4 can be integrally manufactured. The reclining sheet in FIG. 4 has thick portions 21, 23, 25, thin portions 27, and bending portions 22, 24, 26 in the extrusion direction, and these can be integrally manufactured. The bending portions 22, 24, 26 are structured to be easily bent by reducing the thickness. Also, by adjusting the rotation speed of the take-up machines 6a and 6b and the strip extrusion speed from the nozzle 3, the bulk density can be adjusted to form a partially hard cushion material or a soft cushion material. For example, the thick portion 23 serving as the back support portion can be formed to be soft, and the thick portion 25 serving as the seat surface can be formed to be hard.

[0034] By combining the first forming part X and the second forming part Y, it becomes possible to form an end portion having a curve. In this way, by bringing the entire circumferential surface of the strip aggregate perpendicular to the extrusion direction into contact with the forming sheets 8a and 8b, all of the longitudinal side surface and the short side surface can be formed, and post-processing can be reduced.

[0035] The forming sheets 8a and 8b are preferably made of stretchable materials such as rubber or silicon. Thereby, the forming sheets 8a and 8b can be closely attached to the take-up machines 6a and 6b, and during the manufacturing process, the forming sheets 8a and 8b do not bend, etc., and follow the take-up machines 6a and 6b, so that the shape of the three-dimensional network structure 2 corresponding to the forming parts 81a and 81b can be formed.

[0036] A plurality of water passing holes (not shown) may be formed in the forming sheets 8a and 8b. The diameter of the water passing holes is exemplified as 5 to 200 mm. The cooling effect in the water tank 5 can be enhanced by the water passing holes. A cooling water ejection device may be provided in the internal region I to form a water flow into the water passing holes.

[0037] The manufacturing apparatus 1 does not include a chute (a member disposed below the nozzle and above the water tank and having an inclined surface that contacts the wire strip and guides it to the cooling tank) as in the prior art, and it is preferable that the wire strip aggregate 40 extruded from the nozzle 3 directly contacts the take-up machines 6a and 6b in the water tank 5. If the wire strip aggregate 40 contacts the chute before contacting the take-up machines 6a and 6b, the surface portion is solidified on the chute surface, and the height of the unevenness that can be formed thereafter becomes small. Without including a chute, since the wire strip aggregate 40 before solidification directly contacts the forming parts 81a and 81b and is formed, even with unevenness of a certain height, it becomes easier to form.

[0038] According to the present embodiment, the shape can be freely changed not only in the width direction and the thickness direction but also in the extrusion direction. Post-processing can be reduced, and the raw material loss during forming can also be reduced. Also, by simply attaching a sheet to an existing take-up machine as a retrofit, three-dimensional network structures of various shapes can be easily formed.

[0039] Figs. 5 and 6 are diagrams for explaining modified examples 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 has its upper and lower ends attached to corresponding portions of the plate material 68 of the endless members 61a and 61b by screws 92 or the like via a pressing plate 91. The pressing plate 91 has a shape that is long in the lateral direction and is attached substantially parallel to the plate material 68. Each of 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.

[0040] Hereinafter, a method for manufacturing the three-dimensional network structure in this embodiment will be described. For known components, detailed descriptions thereof are omitted, so refer to Japanese Patent No. 4350286, U.S. Patent No. 7,625,629, etc.

[0041] 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 onto the take-up machines 6a and 6b, and attached to the take-up machines 6a and 6b with good adhesion.

[0042] 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 wire 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 wire 41 discharged from the nozzle 3 forms a wire aggregate 40 composed of a plurality of wires 41 due to the arrangement of a plurality of the extrusion holes 31.

[0043] The wire aggregate 40 lands on the water surface in the water tank 5. Here, since the picking-up speed by the pickers 6a and 6b is slower than the falling speed of the wire aggregate, the landed wires are bent and entangled 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 a high temperature), come into contact with the forming sheets 8a and 8b attached to the pair of pickers 6a and 6b, are entangled in a loop shape, and are sandwiched between the pickers 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.

[0044] 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.

[0045] Next, with reference 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 100 series.

[0046] In the second embodiment, as the take-up mechanism, 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 below the pair of first rolls 166a and 166b at a predetermined interval, a drive motor for driving the rolls 166a, 166b, 167a, and 167b, a transmission composed of a chain and gears 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 transmission.

[0047] A sheet 108a having a three-dimensional shaped forming portion 181a formed thereon is bridged between the first roll 166a and the second roll 167a. The rotation of the first roll 166a and the second roll 167a is transmitted to the sheet 108a, and the sheet 108a rotates in the direction of the arrow in FIG. 7. The sheet 108a may be formed from a non-stretchable member in addition to the stretchable member as in the first embodiment. The surface of the sheet 108a on the roll side and the roll surface may be provided with an anti-slip function depending on the shape and material. Similarly, a sheet 108b having a three-dimensional shaped forming portion 181b formed thereon is bridged between the other first roll 166b and the second roll 167b.

[0048] In the internal region I of the sheets 108a and 108b, there is provided a guide 110 for restricting the bending of the sheets 108a and 108b. In the second embodiment, although the sheet is likely to be recessed at the center of the straight portion, the guide 110 contributes to suppressing the recess and maintaining the clamping force. The guide 110 extends in the longitudinal direction parallel to the extrusion direction at least on the side in contact with the linear aggregate 140 in the internal region I. The formed sheets 108a and 108b are peripherally provided in an elongated oval shape in side view and have two straight portions, and the guide 110 is provided in the internal region I thereof. In FIG. 7, the guide 110 is provided on both the side in contact with the aggregate 140 and the opposite side, but it is also possible to provide the guide 110 only on the straight portion on the side through which the aggregate 140 passes. Examples of the shape of the guide 110 include a rod shape and a flat bar shape. The internal region I refers to the internal region separated by the formed sheets 108a and 108b.

[0049] As shown in FIG. 7, the guide 110 is fixed to the upper frame 111 and the lower frame 112 extending in the lateral direction in the internal region I and is provided so as to slide with respect to the formed sheet 108. One or more guides 110 are provided in the extending direction of the rolls 166a, 166b, 167a, and 167b. In the present embodiment, the material of the guide 110 is made of a hard resin, but depending on the elements in the above manufacturing, metal, ceramics, carbon fiber, or a composite material may be used.

[0050] The three-dimensional network structure manufactured by the manufacturing apparatus or manufacturing method of the present invention can be used for reclining sheets, chairs, seat sheets, nursing assist chairs, mattresses, futons, sofas, etc. and can be used as a cushioning material.

[0051] The present invention is not limited to the above-described embodiments, and various modifications, substitutions, deletions, etc. can be made without departing from the technical idea of the present invention, and modifications, equivalences, substitutions, deletions, etc. are also included in the technical scope of the present invention.

Explanation of Reference Numerals

[0052] 1, 101: Manufacturing apparatus for three-dimensional network structure 2: Three-dimensional network 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: Forming sheet 81a, 81b, 181a, 181b: Forming part 110: Guide 111: Upper frame 112: Lower frame 166a, 166b: First roll 167a, 167b: Second roll

Claims

1. A nozzle having a plurality of extrusion holes, for extruding and dropping a molten thermoplastic resin downward as a linear aggregate composed of a plurality of linear strips; A water tank disposed below the nozzle for cooling the linear aggregate; A pair of take-up machines for conveying the linear aggregate in water in the water tank; An endless forming sheet made of a stretchable material, having a three-dimensional shaped forming portion on the surface and attached to at least one of the pair of take-up machines; A manufacturing apparatus for a three-dimensional network structure comprising the above.

2. A nozzle having a plurality of extrusion holes, for extruding and dropping a molten thermoplastic resin downward as a linear aggregate composed of a plurality of linear strips; A water tank disposed below the nozzle for cooling the linear aggregate; A pair of take-up machines for conveying the linear aggregate in water in the water tank; A forming sheet having a three-dimensional shaped forming portion on the surface and attached to at least one of the pair of take-up machines, comprising: The take-up machine has an endless member in which a plurality of laterally long plate materials are longitudinally connected; The forming sheet is made of a stretchable material and is attached to the plate material by an attachment member; A manufacturing apparatus for a three-dimensional network structure.

3. A nozzle having a plurality of extrusion holes, for extruding and dropping a molten thermoplastic resin downward as a linear aggregate composed of a plurality of linear strips; A water tank disposed below the nozzle for cooling the linear aggregate; A pair of take-up machines for conveying the linear aggregate in water in the water tank; A forming sheet having a three-dimensional shaped forming portion on the surface and having a plurality of water passing holes, attached to at least one of the pair of take-up machines; A manufacturing apparatus for a three-dimensional network structure comprising the above.

4. The forming sheet An endless sheet body; In the circumferential direction of the forming sheet, a convex portion protruding in the thickness direction from the sheet body and a bottom portion having a lower height than the top of the convex portion; The manufacturing apparatus for a three-dimensional network structure according to Claim 1.

5. The forming portion has a first forming portion and a second forming portion; The first forming portion forms a first side surface parallel to the extrusion direction of the linear aggregate; The second forming portion forms a second side surface parallel to the extrusion direction of the linear aggregate and orthogonal to the first side surface; The manufacturing apparatus for a three-dimensional network structure according to any one of Claims 1 to 3.

6. An attachment step of attaching an endless forming sheet made of a stretchable material and having a three-dimensional shaped forming portion on the surface to at least one of a pair of take-up machines; An extrusion step of extruding the heat-melted thermoplastic resin as an aggregate of filaments composed of a plurality of filaments from a nozzle having a plurality of extrusion holes; A forming step of conveying and cooling and solidifying the aggregate of filaments in a water tank while forming the aggregate of filaments before solidification by bringing it into contact with the forming sheet by the pair of take-up machines; A method for manufacturing a three-dimensional network structure, comprising:

7. An attachment step of attaching a forming sheet made of a stretchable material having a three-dimensional shaped forming portion on the surface to an attachment member on at least one of a pair of take-up machines having an endless member in which a plurality of laterally long plate members are longitudinally connected; An extrusion step of extruding the heat-melted thermoplastic resin as an aggregate of filaments composed of a plurality of filaments from a nozzle having a plurality of extrusion holes; A forming step of conveying and cooling and solidifying the aggregate of filaments in a water tank while forming the aggregate of filaments before solidification by bringing it into contact with the forming sheet by the pair of take-up machines; A method for manufacturing a three-dimensional network structure, comprising:

8. An attachment step of attaching a forming sheet having a three-dimensional shaped forming portion on the surface and formed with a plurality of water through holes to at least one of a pair of take-up machines; An extrusion step of extruding the heat-melted thermoplastic resin as an aggregate of filaments composed of a plurality of filaments from a nozzle having a plurality of extrusion holes; A forming step of conveying and cooling and solidifying the aggregate of filaments in a water tank while forming the aggregate of filaments before solidification by bringing it into contact with the forming sheet by the pair of take-up machines; A method for manufacturing a three-dimensional network structure, comprising:

9. In the forming step, the forming sheet forms a convex portion protruding in the thickness direction and a bottom portion having a lower height than the top of the convex portion on the surface of the aggregate of filaments; The method for manufacturing a three-dimensional network structure according to any one of Claims 6 to 8.

10. In the forming step, the forming sheet forms a thick portion and a thin portion of the aggregate of filaments; The method for manufacturing a three-dimensional network structure according to any one of Claims 6 to 8.

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