JP2002088631A - Method for producing three-dimensional reticulate structure and apparatus for producing three- dimensional reticulate structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid trouble due to deformation of an endless belt. SOLUTION: This apparatus 10 for producing a three-dimensional reticulate structure is composed of an extruding machine 11, a pair of rolls 12 and 13 installed in horizontal positions at a prescribed interval kept therebetween, a pair of rolls 14 and 15 lined up, arranged under the rolls 12 and 13 and horizontally disposed at a prescribed interval kept therebetween, a driving motor 16 for driving the rolls 12 to 15, a speed changer 17 composed of a chain and gears and changing the moving speed of the rolls 12 to 15, a water tank 18 for partially sinking the pair of the rolls 12 and 13 in water and completely sinking the pair of the rolls 14 and 15 in water, a controller 19 and other measuring instruments, etc., as shown in Fig 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a three-dimensional network structure used for a heat insulating material, a cushion material and the like.

[0002]

2. Description of the Related Art Conventionally, as a method for producing a three-dimensional network structure having voids, a method described in Japanese Patent Publication No. 50-39185 or resin cotton obtained by bonding polyester fibers with an adhesive, for example, a rubber-based adhesive is used. JP-A-60-1
No. 1352 is known. On the other hand, there is a method or apparatus for manufacturing a three-dimensional network-like structure having voids by winding a resin thread with an endless belt.
No. 41262 and the like.

[0003]

However, when manufacturing a plate-shaped three-dimensional network structure, it is considered that the tension applied to the endless belt is not uniform. In some parts, it may loosen and affect the external dimensions of the product. In addition, the endless belt may be easily damaged by heat or the like, which may cause a problem in durability. That is,
Problems such as deformation such as expansion and contraction and loosening of the endless belt, and thermal deformation may occur.

The demand for such a three-dimensional network-structured product is diversified, and it is necessary to cut or mold to a shape required in a post-process of the manufacturing process to finish the deformed network-like body one by one. , Finishing becomes very complicated.

The three-dimensional network structure manufactured by the conventional method has a low density and both sides of the bundle are in contact with the belt conveyor, so that the surface is substantially flattened. Are random spiral shapes and are misaligned.

Accordingly, the present invention avoids inconvenience due to deformation of the endless belt, eliminates the need for finishing in a later process, increases the degree of alignment, enables adaptation to irregular shapes, and improves durability. An object of the present invention is to provide a method and an apparatus for manufacturing a three-dimensional network structure.

[0007]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the invention according to claim 1 is to extrude a molten filament made of a thermoplastic resin as a raw material or a main raw material downward from a die having a plurality of holes, and Partially submerged, naturally lowered between two or more rolls, when manufacturing the three-dimensional network-like structure by pulling the filaments slower than the descent speed, when the width of the aggregate of extruded filaments A method of manufacturing a three-dimensional network-like structure, wherein a distance between rolls is set to be small, and at least two, three, or four surfaces of an outer periphery of the aggregate of the filaments contact the roll before and after the roll is submerged. It is. Thereby, the deformation of the conventional endless belt can be eliminated,
Further, in the case of three- or four-side molding, finishing in a later step is not required, and the degree of alignment can be increased. The material of the roll includes rubber, metal and the like.

According to a second aspect of the present invention, the density of any one of two, three, or four surfaces on the outer periphery of the three-dimensional network structure is relatively lower than the density of a portion other than the surface. The method for producing a three-dimensional network structure according to claim 1, characterized in that: Thereby, the subject of claim 1 can be more suitably solved.

According to a third aspect of the present invention, the density of the surface portion and the intermediate portion of any two, three or four surfaces of the outer periphery of the three-dimensional network structure is more relative to the density of the portion except the surface side. 3. The method for manufacturing a three-dimensional network structure according to claim 2, wherein Thereby, the subject of claim 1 can be more suitably solved.

According to a fourth aspect of the present invention, there is provided an extrusion molding machine including a die having a die having a plurality of holes at a tip end thereof, and extruding a molten wire made of a thermoplastic resin as a raw material or a main raw material downward from the die. And a water tank, and at least two rolls partially submerged in the water tank, wherein the wire is lowered between the rolls, and the rolls are drawn so as to pull in the wire more slowly than the descent speed. Set the speed, the interval between the rolls is set narrower than the width of the extruded filament aggregate, at least two, three or four sides of the outer circumference of the filament aggregate before and after the roll submerges An apparatus for manufacturing a three-dimensional network structure, wherein the apparatus is in contact with the roll. This can solve the same problem as the first aspect.

According to a fifth aspect of the present invention, there is provided an extrusion molding machine comprising a die having a die having a plurality of holes at a tip end thereof, and extruding a molten wire made of a thermoplastic resin or a main raw material downward from the die. And a water tank, and at least two rolls partially submerged in the water tank, wherein the wire is lowered between the rolls, and the rolls are drawn so as to pull in the wire more slowly than the descent speed. The speed is set, and the interval between the rolls is set to be narrower than the width of the aggregate of the extruded filaments. At least two outer surfaces of the aggregate of the filaments contact the roll before and after the roll is submerged. The three-dimensional network structure manufacturing apparatus is characterized in that the cross section of the roll is an irregular cross section. This makes it possible to achieve the same object as in claim 1 and to make it possible to cope with irregular shapes.

According to a sixth aspect of the present invention, there is provided an extrusion molding machine including a die having a die having a plurality of holes at a tip end thereof, and extruding a molten wire made of a thermoplastic resin as a raw material or a main raw material downward from the die. And a water tank, at least two rolls partially submerged in the water tank, and one or two rolls completely submerged in the water tank, wherein the filament is lowered between the rolls. The speed of the roll is set so as to pull in the filament more slowly than the descending speed, the interval between the rolls is set smaller than the width of the aggregate of the extruded filaments, and before and after the roll is submerged. An apparatus for producing a three-dimensional network structure, wherein at least two surfaces on the outer periphery of an assembly of filaments are in contact with the roll. This can eliminate the deformation of the conventional endless belt,
In the case of three-sided or four-sided molding, finishing in a later step is not required, the degree of alignment can be increased, and smooth movement of the three-dimensional network structure can be ensured.

According to a seventh aspect of the present invention, there is provided an extrusion molding machine comprising a die having a plurality of holes at a tip end thereof, and extruding a molten wire made of a thermoplastic resin as a raw material or a main raw material downward from the die. And a water tank, and at least two rolls partially submerged in the water tank, wherein the wire is lowered between the rolls, and the rolls are drawn so as to pull in the wire more slowly than the descent speed. The speed is set, the interval between the rolls is set to be smaller than the width of the extruded filament aggregate, and the die is formed so that a hollow portion of the filament aggregate is formed before and after the roll is submerged. An apparatus for manufacturing a three-dimensional network structure, characterized in that a closed portion is formed in the three-dimensional network structure. As a result, a three-dimensional network structure having an irregular cross section is realized,
It can be applied to various uses such as insertion of a reproduction member or the like into the hollow portion.

According to the present invention, there is provided an extrusion molding machine comprising a die having a die having a plurality of holes at a tip end thereof, and extruding a molten wire made of a thermoplastic resin as a raw material or a main raw material downward from the die. And a water tank, and at least two rolls partially submerged in the water tank, wherein the wire is lowered between the rolls, and the rolls are drawn so as to pull in the wire more slowly than the descent speed. The speed is set, the interval between the rolls is set to be narrower than the width of the extruded filament aggregate, and the base is formed so that the aggregate of the filaments can be densely packed in a predetermined direction before and after the roll is submerged. And a region having a high density of holes and a region having a low density of holes. As a result, a three-dimensional network structure having an irregular cross section is realized. The predetermined direction is a thickness direction, a width direction, or the like.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2 (a), a three-dimensional network structure 1 according to a first embodiment uses a recycled thermoplastic resin as a raw material or a main raw material, and has a plurality of helical spirals. A three-dimensional network-like structure characterized in that it is a plate-like three-dimensional network-like structure that is entangled randomly in a shape and is partially thermally bonded. The density of the three surface side of the three-dimensional network structure,
It is preferable that the density is relatively lower than the density of the portion excluding the surface side. That is, the three-dimensional network structure 1 (see FIG. 2A) of the first embodiment is a three-sided molding, and a region at a predetermined interval from another opposing surface toward the inside is formed with high density. The density of the region inside the central portion is set lower than that, and the other surface is irregular. For this reason, there is an advantage that there is no need to process in a later step. In other words, the pair of wide surfaces and one side surface are forcibly formed by a roll or the like described later, and the edges are aligned more clearly than the other surfaces.

Here, flakes or chips of PET bottles are used as the raw material or main raw material of the recycled thermoplastic resin. PET bottles are crushed as they are and melted to form flakes. Suitable for the age of promoting recycling. If this is not a recycled product but a genuine product, it costs 1 m in terms of cost such as dry crystallization or dust removal.
The production cost per ² doubles. Effective in reducing waste disposal costs. However, the present invention is also applicable to thermoplastic resins other than recycled. For example, as a thermoplastic resin, polyethylene, polyolefin such as polypropylene, polyester such as polyethylene terephthalate, polyamide such as nylon 66, polyvinyl chloride,
Examples include polystyrene, copolymers and elastomers copolymerized based on the above resins, and blends of the above resins. Furthermore, examples of the use of the three-dimensional network structure 1 include an example in which the three-dimensional network structure 1 is mainly applied under or inside a cushioning material, a shock absorbing material, or a flooring material, but can also be applied inside a double wall. . In the first embodiment, the inside is formed with a substantially uniform density. The apparent density is 0.
02 to 0.9 g / cm ³ (corresponding to a porosity of 36 to 98.4%) is preferred, and 0.05 to 0.15 g / cm ³ is particularly preferred. The three-dimensional network structure 1 has a width of, for example, 0.1 m to 2 m.
m, the thickness is preferably 5 mm to 200 mm, it is endless in the length direction, and has an appropriate length (for example, 900 m
m), but is not limited to these size examples.

The three-dimensional network structure 2 of the second embodiment (FIG. 2)
(Refer to (b)) is a four-sided molding, in which all surfaces are aligned, and regions at predetermined intervals from the left and right side surfaces of the three-dimensional network structure 1 of the first embodiment toward the inside are formed with high density. The density of the region inside the central portion is set lower than that. That is, regions except for the upper surface and the bottom surface and at predetermined intervals from all surfaces toward the inside are formed with high density.

The three-dimensional network structure 3 of the third embodiment has an irregular surface. For example, 3A with a convex surface (see FIG. 3A), 3B with a concave surface
(See FIG. 3 (b)), 3C with a plurality of continuously formed uneven surfaces (see FIG. 3 (c)), 3D with a plurality of sawtooth surfaces (see FIG. 3 (d)) 3E (see FIG. 3 (e)) having a plurality of wavefronts, 3F (see FIG. 3 (f)) having a curved corner (see FIG. 3 (f)), and a corner cut at a predetermined angle (here 45 degrees). 3G (see FIG. 3 (g)), or an appropriate combination of them, and various forms are required as products at the construction site, and this can be met. In addition, it is considered that a variety of uses are caused by the complicated shape. In particular, various product requirements can be satisfied by forcibly forming the three or four sides of the three-dimensional network structure as in the first and second embodiments. More generally, for the required deformed shape of the product, the required shape is cut or molded in a later step to form a deformed mesh.
According to the present embodiment, the product can be provided immediately without finishing the shape and dimensions required of the product in a post-process, and the post-process can be eliminated.

The three-dimensional network structure 4 of the fourth embodiment (FIG. 2)
(C) has one or more (here, two) hollow portions 4A and 4B, and aims at further cost reduction and the like.

The three-dimensional network structure 5 of the fifth embodiment (FIG. 2)
(Refer to (d)). A hollow member 5A, 5B similar to the hollow portion 4A, 4B of the three-dimensional network structure 4 of the fourth embodiment has a recycled member 5C such as a plate-shaped recycled veneer or a plate-shaped recycled shredder dust. , 5D, and the purpose is to improve the sound absorption and the like by using a recycled plate material.

The three-dimensional network structure 6 of the sixth embodiment (FIG. 2)
(See (e)) is to form, in the interior of the three-dimensional network structure 2 of FIG. 2 (b) of the four-sided molding, a region in which the density is increased in the internal region perpendicular to the pair of wide surfaces, so to speak Alternatively, a plurality of (here, three) beams 6A, 6B, and 6C are formed at predetermined intervals to improve sound absorption and impact resistance.

The three-dimensional network structure 7 of the seventh embodiment (FIG. 2)
(Refer to (f)) is a sheet-like high-density portion 7A formed inside a two-sided three-dimensional network structure to improve sound absorption and impact resistance.

In addition, although not shown in the drawings, the present invention can also be applied to the case where the cross-sectional shape is an irregular cross-section such as a triangular shape or a Y-shaped shape.

(3D Network Structure Manufacturing Apparatus) Next, a 3D network structure manufacturing apparatus 10 will be described.

As shown in FIG. 4, the three-dimensional network structure manufacturing apparatus 10 includes an extruder 11, a pair of rolls 12 and 13 installed at a predetermined position in a horizontal position, and a pair of rolls 12 and 13. Arranged in line with them below,
A pair of rolls 14 horizontally arranged at predetermined intervals,
15 (see FIGS. 5 and 6), a drive motor 16 for driving the rolls 12 to 15, a roll 1
A transmission 17 for shifting the moving speeds of 2 to 15 and a pair of rolls 14 and 15 by partially submerging a pair of rolls 12 and 13
, A control unit 19, and other instruments and the like.

The rolls 12 and 13 are rolls 2 having a circular cross section.
4 (see FIG. 7 (a)), as well as those having an irregular cross section. For example, a roll 25 whose outer peripheral surface has a sawtooth cross section (FIG. 7)
(See FIG. 7 (b)), a continuously formed uneven shape, for example, a roll 26 whose outer peripheral surface is a gear section (see FIG. 7 (c)),
Roll 27 (see FIG. 7 (d)) having one or more protrusions 27a (for example, triangular or round protrusions) formed on the outer peripheral surface, roll 28 having an elliptical cross section (see FIG. 7 (e)), triangle Or a roll 29 having an onigiri section (see FIG. 7 (f)), a roll 30 having a polygonal section, for example, an octagonal section.
Various modifications such as (see FIG. 7 (g)) are possible.

As shown in FIG. 6, the rolls 12 to 15 have drive shafts 12a to 15a, respectively. Drive shaft 12a-
5a are rotatably supported by respective bearings 20 (see FIG. 4), and are each driven by a drive motor 16 via a transmission 17 in the direction of the arrow in FIG.

As shown in FIG. 4, the extruder 11 comprises a container 31, a raw material supply port 32 provided on the upper part of the container 31, a die 33, a base 34 detachably fixed to a lower end of the die 33, and the like. I have. The temperature inside the die of the extruder 11 is 100 to 400 ° C., and the extrusion amount is 20 to 2
It can be set to, for example, 00 kg / hour. The pressure range of the die 33 is 0.2 to 25 MPa, for example, a discharge pressure of a 75 mm screw. The thickness of the three-dimensional network structure is 100 mm
When the pressure exceeds, it is necessary to make the die pressure uniform by a pump or the like. Therefore, it is necessary to increase the pressure in the die by a gear pump or the like in order to uniformly discharge the filaments from the whole area in the die. At this time, in order to form the shape of the three-dimensional mesh sheet, each surface of the rolls 14 and 15 has a structure that can freely move, and the shape of the base 34 of the die 33 (the hole H
(Density or diameter) and the conveying speed of the rolls 14 and 15, a product having a desired density and strength can be manufactured, and various requirements of the product can be satisfied.

Here, a three-dimensional network structure manufacturing apparatus 50 in the case of a four-sided molding machine as shown in FIGS. 8 (a) and 8 (b).
Will be described. The three-dimensional network structure manufacturing apparatus 50 includes rolls 52, 53 having rotating shafts 52a, 53a corresponding to the rolls 12, 13 in the case of the two-sided forming shown in FIG.
And a rotatable rotating shaft 56 in which the rotating shafts are arranged orthogonal to the longitudinal ends of these rolls 52 and 53.
A pair of rolls 56 and 57 having a and 57a are arranged. Bevel gears 52b, 52 are provided on the rotating shaft 52a, respectively.
c, the bevel gears 56b, 57b are also provided on the rotating shafts 56a, 57a, respectively, and the bevel gears 52b, 52c and the bevel gears 56b, 57b are meshed with each other.
3a is synchronously driven by a motor M via a chain C, so that the rotating shafts 56a and 57a are also synchronously driven. The other ends of the rotating shafts 56a, 57a are supported by bearings 58a, 58b.

As shown in FIG. 8C, a three-dimensional network structure can be manufactured by using four-sided molding. In addition, as shown in FIG. 8D, three-side molding can be performed using this. That is, depending on the type of the three-dimensional network structure, if two dies are provided and the filaments are extruded in parallel, the production efficiency is doubled. 8C and 8D, the illustration of the motor M is omitted.

As shown in FIG. 9, as a modification, a driving source (motor or the like) is provided instead of the above-described synchronous driving.
A configuration in which the rolls 62 and 63 and the rolls 66 and 67 (or rolls) may be independently driven is also possible. That is, in the case of three-sided or four-sided molding, rolls 62 and 63 having rotating shafts 62a and 63a and these rolls 62 and 63
A pair of rolls 66, 67 having rotatable rotating shafts 66a, 67a whose rotating shafts are arranged orthogonally to the longitudinal ends of the rolls 66, 67a are arranged. Motors M are also provided on the rotating shafts 66a and 67a, respectively, so that they can be driven independently. The other ends of the rotating shafts 66 a and 67 a are bearings 68.
a, 68b.

The hole of the base 34 (see FIG. 4) is of a series descending type, from which a hole is made, from which the thread descends downward. The intervals may be equal or non-equidistant. The holes can take various arrangements such as staggered, orthogonal, and the like. When it is desired to change the array density, a method of positively increasing the density only in the end region may be adopted. By changing the shape of the base in various ways, it is possible to satisfy various requirements of products. For example,
Approximately 35 with a diameter of 0.5 mm in an area of 1.0 mx 180 mm
A base 71 in which 00 holes H are formed at substantially equal intervals (the range of the size of the region provided with the holes H of the base occupies 90% of the area of the base 71) (see FIG. 10A). Part 72a
A base 72 having only a higher density of holes H (see FIG. 10B), a base 73 having a higher density of frame portions 73a so as to form a grid-like region (see FIG. 10C), and a large number of holes H In addition, slits (straight through grooves) 74a to 7
A base 74 having a base 4c (see FIG. 10 (d)) and a slit (through-line groove) at the center in the longitudinal direction in addition to the large number of holes H.
A base 75 having a base 75a (see FIG. 10 (e)), a slit (through-line groove) 76a in the longitudinal direction in addition to the large number of holes H.
Is formed at a position near the side in the longitudinal direction (FIG. 10).
(Refer to (f)), to form a hollow portion, the regions 77c and 77d where the holes H are not provided at corresponding locations are formed, and a rectangular guiding member (a pipe or the like) 77a extending downward below the regions. , 77b (FIG. 10 (g),
(See (h))). The density of the holes H formed in the die is preferably 1 to 5 holes / cm ² . From the slit, a sheet in which the filaments are entangled is formed.

(Manufacturing method of three-dimensional network structure) The three-dimensional network structure 1 is manufactured as follows. First, recycle PE
The T-bottle flakes are heated and dried to prevent hydrolysis, and an agent for improving the finish or an antibacterial agent may be added to the flakes. When the filament descends flat from the base 34, it is spirally wound by the rolling action of the rolls 12 and 13 of the rolls 14 and 15. The rolls 12 and 13 are rolled in from the place where they hit the surface. The entrained portion has a high density, and the unengaged portion has a low density.

Next, as shown in FIG. 5, the molten thermoplastic resin is extruded downward from a plurality of dies 33, and is naturally dropped between a pair of rolls 12 and 13 which are partially submerged. When manufacturing the three-dimensional network-like structure 1 which is a three-dimensional network-like structure by taking off, the interval between the pair of rolls 12 and 13 is narrower than the width of the aggregate of the extruded molten resin, and the rolls 12 and 13 Before and after the submergence of the molten resin 13, both sides or one side of the aggregate of the molten resin are rolls 12 and 13.
Contact. Further, the three-dimensional network structure 1 is sent out by the rolls 14 and 15.

The surface portion of both sides or one side of the melted thermoplastic resin aggregate falls on the rolls 12 and 13 and moves inside the melted thermoplastic resin aggregate to form a dense state. The porosity is smaller than that of the central part that has just dropped. As a matter of course, the surface portion where the porosity is low has a larger number of intersections than the central portion where the porosity is high, and the tensile strength is significantly increased. In addition, the surface portion having a low porosity has a small area of the void portion, and becomes a shock absorbing layer and a soundproof layer.

In order to function as the three-dimensional network-like structure 1, the overall porosity is preferably in the range of 80% to 98% porosity, although it depends on the local construction conditions used. Obtained. That is, it is considered that the sound is blocked when the density is high. In order to exhibit a sufficient function as a recycled sound-absorbing building material, it was found that the porosity should be at least 80% or more. That is, the porosity is 80
%, The shock absorbing effect and the soundproofing effect were not improved as expected. The porosity may be appropriately designed in a range of 80% or more and 98% or less according to the use of the three-dimensional network structure 1.

The surface of the three-dimensional network-like structure 1 has a low porosity, and the distance from the surface to one to three times the diameter of the filament is approximately several mm. Due to the structure of the three-dimensional network-like structure 1 of the present invention, the surface portions are densely striated, and there are portions where the striates overlap with each other. Up to about three overlapping parts could be confirmed. In addition, when the cross-sectional shape of the filament forming the three-dimensional network structure 1 is circular,
This is the diameter, and when the cross-sectional shape is not circular such as a square, the diameter is determined from the cross-sectional area assuming that the cross-section is circular.

The thermoplastic resin used here is P
The ET bottle is crushed and made into flakes as a raw material or a main raw material. However, there is no problem as long as the resin can be processed by an ordinary extruder, such as a polymer such as polypropylene or a plurality of polymers blended with the main raw material.

In the step of forming the deformed three-dimensional network into a product shape, the internal pressure of the die is made uniform, and the take-up surface is taken up on two, three or four sides or an intermediate portion. This enables an apparent density of 0.02 to 0.9 g / cm ³ , makes the melted filament a flat shape from a disordered spiral shape, and a three-dimensional structure of the front surface, rear surface, left end surface, and right end surface in the thickness direction. It is characterized in that the surface of the reticulated structure has a flat, uneven shape. A variety of three-dimensional network structures can be obtained by combining a die with a shape such as a round bar or a deformed shape (pipe, Y-type) and a combination thereof in order to form a three-dimensional network structure. Further, the three-dimensional network structure is formed into a sheet structure of an ultra-dense structure by roll compression of a take-off machine. Recycled PET from dice
In order to uniformize the internal pressure of the die for the resin to be discharged uniformly and to make contact with the take-off conveyor that forms the shape of the extruded molten resin on the three or four sides of the aggregate when manufacturing the three-dimensional mesh sheet. did. In other words, melted recycled PE
An aggregate of T resin is formed on three or four surfaces to have a shape corresponding to the product shape. For example, if necessary, a resin aggregate is taken on a polygonal conveyor or the like to form a product. One method of obtaining a three-dimensional mesh sheet is to extrude the molten resin downward from a plurality of dies and let it fall naturally on a water surface or a partially submerged conveyor, thereby creating a disordered spiral shape and forming a three-dimensional mesh. Sheet. Sheet width
When the thickness was 0 m and the thickness was 100 mm, it was confirmed that the density was changed by changing the speed of the roll to confirm that the density was changed. Furthermore, it was confirmed that the density changed with the change of the discharge amount of the extruder.

In a single screw extruder having a screw diameter of 75 mm, a die 33 having an area of 1.0 mx 180 mm and a die 34 having a diameter of 0.5 mm and having approximately 3500 holes H at approximately equal intervals were placed. Attached. Approximately 1 below the die 33
A water tank 18 having a water level at a position of 20 mm is installed.
2m rolls 12 and 13 are separated by 50mm
On the other hand, the rolls 12 and 13 were installed almost vertically so that the upper portions of the rolls 12 and 13 came out of the water surface by about 40 mm. In addition, the rolls 14 and 15 having a width of 1.2 m were set to be completely submerged below the rolls 12 and 13 vertically.

With this apparatus, the temperature of the die 33 is controlled so that the resin temperature becomes 240 ° C. while plasticizing the regenerated PET resin by applying heat to the recycled PET resin.
The assembly of the molten resin that came out of the die 34 with an extrusion amount of kg was extruded between the rolls 12 and 13 such that both surfaces of the aggregate fell down. The take-up speed of the rolls 12 and 13 at this time is 0.7
m / min. The molded product that has been moved downward by being sandwiched between the rolls 12 and 13 is provided by rolls 14 and 15 below the water tank 18.
To move to the water surface from the side opposite to the extruder, and when it came out of the water tank 18, water was blown off by compressed air or a vacuum pump.

The three-dimensional network structure thus obtained has a width of 1.0 m, a thickness of 50 mm and a density of 0.07.
０．１0.14 g / cm ³ was obtained. Applications include heat insulating materials, base materials, sound absorbing materials, drainage pipes, and the like.

According to the three-dimensional net-like structure 1 described above, the three-dimensional net-like structure which does not require finishing in a later step, increases the degree of alignment, can cope with an irregular shape, and has improved durability. Can be provided.

According to this embodiment, a PET bottle having no use at present can be used as a three-dimensional network structure.
It is thought that the recovery rate of PET bottles will increase. This greatly facilitates PET bottle recycling.

FIG. 11 shows a modified embodiment of the four-sided molded three-dimensional network structure manufacturing apparatus 50. FIG. 11 corresponds to FIG. 8B and shows the pair of rolls 56 and 57 (or roll 12). (At least one of the rolls 57 to 15) is formed with one or more protrusions 60a to 60c (the roll 57 and the protrusions are not shown). This is because a recess is formed on the side surface of the three-dimensional network structure. The protrusions 60a to 60c of the rolls 56 and 57 are formed in a rectangular cross section and in an arc shape. Theoretically, the dent should be square, but since the resin thread falls from above as described above, blinds are formed and, in fact, there is a region where the resin thread does not enter, so the three-dimensional mesh The depression on the side surface of the structure is curved. In other words, it feels like taking a round. In addition, the aforementioned rolls 56 and 57 or roll 6
The cam and the spring may be put in the rotating bodies 2 and 63, and the protrusion may be configured so that the cam pushes the protrusion outward in synchronization with the rotation. Blinds can be reduced and more precise depressions can be formed. Other structures are the same as those in FIG.
The illustration and description are incorporated by reference.

It should be noted that the present invention is not limited to the above-described embodiment, but may be modified without departing from the technical concept of the present invention. , Equivalents and the like are also included in the technical scope of the present invention. For example, as shown in FIG.
Alternatively, a structure in which three rolls 82, 83, and 84 are provided may be adopted.

[0047]

According to the first to eighth aspects of the present invention, it is possible to avoid inconvenience due to deformation of the endless belt, to eliminate the need for finishing in a later process, to increase the degree of alignment, to cope with irregular shapes, and to improve durability. It is possible to provide a method and an apparatus for producing a three-dimensional network-like structure having improved properties, and the industrial utility value given to various industries is extremely large.

[Brief description of the drawings]

FIG. 1 is a perspective view of a three-dimensional network structure according to a first embodiment of the present invention.

2A is a cross-sectional view of a three-dimensional network structure according to a first embodiment of the present invention, FIG. 2B is a cross-sectional view of a three-dimensional network structure according to a second embodiment, and FIG. (D) is a cross-sectional view of the three-dimensional network structure of the fifth embodiment, (e) is a cross-sectional view of the three-dimensional network structure of the sixth embodiment, and (f) is a cross-sectional view of the three-dimensional network structure of the sixth embodiment. It is sectional drawing of the three-dimensional network structure of 7th Embodiment.

FIGS. 3A to 3G are cross-sectional views of a three-dimensional network structure according to a third embodiment of the present invention.

FIG. 4 is a perspective view of a three-dimensional network structure manufacturing apparatus according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an operation state of the three-dimensional network structure manufacturing apparatus according to the embodiment of the present invention.

6A and 6B are a side view and a front view of a roll of the three-dimensional network structure manufacturing apparatus.

7 (a) to 7 (g) are side views of the same three-dimensional network structure manufacturing apparatus and a roll of a modified embodiment.

8A is a plan view of a roll of the three-dimensional network structure manufacturing apparatus in the case of four-sided forming, FIG. 8B is a side view of the three-dimensional network structure manufacturing apparatus, and FIG. FIG. 4D is a plan view illustrating a state of four-sided molding by the structure manufacturing apparatus, and FIG. 4D is a plan view illustrating a state of three-sided molding by the three-dimensional network structure manufacturing apparatus.

FIG. 9 is a plan view of a roll of an apparatus for manufacturing a three-dimensional mesh structure having an independently driven structure in the case of four-sided molding.

FIGS. 10A to 10H are a plan view and a front view showing various forms of a die cap.

FIG. 11 is a front view of a roll of an apparatus for manufacturing a three-dimensional network structure for four-sided molding according to a modified embodiment.

FIG. 12 is a front view of a three-dimensional, three- or four-sided three-dimensional network structure manufacturing apparatus according to a modified embodiment.

[Explanation of symbols]

1 to 7: three-dimensional network structure, 4A, 4B: hollow portion, 5
A, 5B: hollow portion, 5C, 5D: regenerating member, 6A, 6
B, 6C: beam, 10: three-dimensional network structure manufacturing apparatus, 11
... Extruder, 12-15 ... Roll, 12a-15a ...
Drive shaft, 16: drive motor, 17: transmission, 18: water tank, 19: control device, 31: container, 32: raw material supply port, 33: die, 34: base, 50: three-dimensional network structure manufacturing apparatus, 52, 53 ... roll, 52a, 53a ... rotating shaft, 52b, 52c ... bevel gear, 56, 57 ... roll,
56a, 57a: rotating shaft, 56b, 57b: bevel gear, 5
8a, 58b ... bearing

Claims (8)

[Claims] 1. A molten filament made of a thermoplastic resin as a raw material or a main raw material is extruded downward from a die having a plurality of holes, and is naturally lowered between two or more rolls partially submerged. When manufacturing a three-dimensional network-like structure by drawing the filaments slower than the speed, the interval between the rolls is set smaller than the width of the aggregate of extruded filaments, and the filaments before and after the rolls are submerged. A method for producing a three-dimensional network-like structure, wherein at least two, three, or four sides of the outer periphery of the aggregate of the above-mentioned aggregates are in contact with the roll. 2. The density of a surface of any one of two, three or four sides of an outer periphery of the three-dimensional network structure is relatively lower than a density of a portion excluding the surface side. 2. The method for producing a three-dimensional network structure according to 1. 3. The density of a surface side and an intermediate portion of any one of two, three or four sides of an outer periphery of the three-dimensional network structure is relatively lower than a density of a portion excluding the surface side. The method for producing a three-dimensional network structure according to claim 2. 4. An extruder, comprising: a die having a die having a plurality of holes at a tip end thereof, and extruding a molten wire made of a thermoplastic resin as a raw material or a main raw material downward from the die, a water tank, At least two rolls partially submerged in a water tank, comprising: lowering the filament between the rolls; setting a speed of the roll so as to draw in the filament slower than the descending speed; The interval between the rolls is set to be narrower than the width of the aggregate of the extruded filaments, and at least two, three, or four surfaces of the outer periphery of the aggregate of the filaments contact the roll before and after the roll is submerged. A three-dimensional network structure manufacturing apparatus characterized by the following. 5. An extruder, comprising: a die having a die having a plurality of holes at a tip end thereof, and extruding a molten wire made of a thermoplastic resin as a raw material or a main raw material downward from the die, a water tank, At least two rolls partially submerged in a water tank, comprising: lowering the filament between the rolls; setting a speed of the roll so as to draw in the filament slower than the descending speed; The interval between the rolls is set to be narrower than the width of the aggregate of the extruded filaments, and at least two outer peripheral surfaces of the aggregate of the filaments contact the roll before and after the roll is submerged, and the cross section of the roll A three-dimensional network-like structure manufacturing apparatus, characterized in that a cross section is irregular. 6. An extruder, comprising: a die having a die having a plurality of holes at a tip end thereof, and extruding a molten wire made of a thermoplastic resin as a raw material or a main raw material downward from the die, a water tank, At least two rolls partially submerged in a water tank, and one or two rolls completely submerged in the water tank, wherein the wire is lowered between the rolls, and The speed of the roll is set so as to pull in the filament slowly, the interval between the rolls is set to be smaller than the width of the aggregate of the extruded filaments, and the aggregate of the filaments before and after the roll is submerged. An apparatus for producing a three-dimensional network structure, wherein at least two surfaces of an outer periphery are in contact with the roll. 7. An extruder, comprising: a die having a die having a plurality of holes at a tip end thereof, and extruding a molten wire made of a thermoplastic resin as a raw material or a main raw material downward from the die, a water tank, At least two rolls partially submerged in a water tank, comprising: lowering the filament between the rolls; setting a speed of the roll so as to draw in the filament slower than the descending speed; The gap between the rolls was set to be narrower than the width of the aggregate of the extruded filaments, and a closed portion was formed in the die so that a hollow portion of the aggregate of the filaments was formed before and after the roll was submerged. An apparatus for producing a three-dimensional network-like structure, characterized in that: 8. An extruder, comprising: a die having a die having a plurality of holes at a tip end thereof; and extruding a molten wire made of a thermoplastic resin as a raw material or a main raw material downward from the die, a water tank, At least two rolls partially submerged in a water tank, comprising: lowering the filament between the rolls; setting a speed of the roll so as to draw in the filament slower than the descending speed; The gap between the rolls is set to be narrower than the width of the aggregate of the extruded filaments, and the density of the holes in the die is high so that the aggregates of the filaments can be dense and coarse in a predetermined direction before and after the roll is submerged. An apparatus for producing a three-dimensional network structure, wherein a region and a low region are formed.