JP4350285B2 - Three-dimensional network structure manufacturing method and three-dimensional network structure manufacturing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manufacturing method and a manufacturing apparatus for a three-dimensional network structure used for a heat insulating material, a cushioning material, and the like.
[0002]
[Prior 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 a resin cotton obtained by bonding polyester fibers with an adhesive, for example, using a rubber system as an adhesive is disclosed in No. 60-11352 is known. On the other hand, there is a method or manufacturing apparatus for manufacturing a three-dimensional network structure having voids by winding resin yarns with an endless belt, and examples include the invention shown in JP-A-11-241262.
[0003]
[Problems to be solved by the invention]
However, when manufacturing a plate-shaped three-dimensional network structure, the tension applied to the endless belt is considered to be not uniform, and it is stretched at the upper and lower ends, but is loosened at the middle portion to the outer dimensions of the product. May have an effect. Further, the endless belt is liable to be damaged by heat or the like, and there is a possibility that a problem in durability may occur. That is, there is a risk of inconvenience due to deformation of endless belts such as expansion and contraction, looseness, thermal deformation, and the like.
[0004]
In addition, the demand for such a three-dimensional network structure product is diversified, and it is necessary to cut or shape into the required shape in the subsequent process of the manufacturing process to finish the deformed network structure one by one. Very complicated.
[0005]
In addition, the three-dimensional network structure manufactured by the conventional method has a low density, and both surfaces of the bundle are in contact with the belt conveyor, so the surface is substantially flattened, but the left and right end surfaces of the bundle are random. They are spiral and misaligned.
[0006]
Therefore, the present invention avoids inconvenience due to the deformation of the endless belt, eliminates the need for finishing in the subsequent process, increases the degree of alignment, makes it possible to cope with irregular shapes, and improves the durability, and has a three-dimensional mesh shape. It is an object of the present invention to provide a structure manufacturing method and a manufacturing apparatus.
[0007]
[Means for Solving the Problems]
  In view of the above problems, the invention described in claim 1 has a plurality of holes in a melted filament made of a thermoplastic resin as a raw material or a main raw material.Has a base at the tipExtruded downward from the die and partially submerged, BWhen producing a three-dimensional network structure by letting it naturally fall between the rolls and pulling the filaments slower than the descent speed,There are two pairs of the rolls facing each other, and a quadrilateral is formed in the direction perpendicular to the extrusion direction by the two pairs of rolls,From the width of the extruded filament aggregate,Opposite each otherThe interval between the rolls is set narrow, and the outer periphery of the aggregate of the filaments before and after the roll is submergedFoursurfaceallIs in contact with the rollThe density on the surface side of all four outer surfaces parallel to the extrusion direction is relatively higher than the density of the portion excluding the surface side.Is a method for producing a three-dimensional network structure. Thereby, the deformation of the conventional endless belt can be eliminated, and, FourSurface moldingByThus, finishing in the subsequent process is unnecessary, and the degree of alignment can be increased. Examples of the material of the roll include rubber and metal.
[0008]
  The invention according to claim 2A closed part was formed in the base so that a hollow part of the aggregate of the filaments was formed before and after the roll was submerged.The method for producing a three-dimensional network structure according to claim 1. Thus, the problem of claim 1 can be solved more suitably.
[0009]
  The invention described in claim 3When the lengthwise direction of the quadrilateral formed in the direction perpendicular to the extrusion direction by the two pairs of rolls is the width direction, before and after the roll is submerged, the aggregate of the filaments can be densely packed in the width direction. In the first or second aspect of the present invention, a region having a high hole density and a region having a low hole density are formed in the base.It is a manufacturing method of the three-dimensional network-like structure of description. Thus, the problem of claim 1 can be solved more suitably.
  The invention according to claim 4 is the method for producing a three-dimensional network structure according to any one of claims 1 to 3, wherein the density is changed in the extrusion direction by changing the speed of the roll or the discharge amount of the extruder. It is.
[0010]
  Claim5The invention described is provided with a die having a die having a plurality of holes at its tip, an extrusion molding machine for extruding a molten filament made of a thermoplastic resin as a raw material or a main raw material downward from the die, a water tank, Partially submerged in the aquarium,Two pairs facing each otherA roll, andA quadrilateral is formed in the direction perpendicular to the extrusion direction by the two pairs of rolls,The wire is lowered between the rolls, the speed of the roll is set so that the wire is drawn slower than the descending speed, and the width of the aggregate of the extruded wires is set.Opposite each otherThe interval between the rolls is set narrow, and the outer periphery of the aggregate of the filaments before and after the roll is submergedFoursurfaceallContacts the rollThe density on the surface side of all four surfaces of the outer periphery parallel to the extrusion direction is relatively higher than the density of the portion excluding the surface side.This is a three-dimensional network-structure manufacturing apparatus. Thus, the same problem as in claim 1 can be solved..
[0013]
  Claim6The described invention,in frontA closed portion is formed in the base so that a hollow portion of the aggregate of the filaments is formed before and after the roll is submerged.Claim 5This is a three-dimensional network structure manufacturing apparatus. As a result, a three-dimensional network structure having an irregular cross section is realized, and can be applied to various uses such as inserting a regenerative member or the like into the hollow portion.
[0014]
  Claim7The invention described isWhen the longitudinal direction of the quadrilateral formed in the direction perpendicular to the extrusion direction by the two pairs of rolls is the width direction,Before and after the roll is submerged.The widthA region having high and low hole density was formed in the die so as to be dense in the direction.Claim 5 or 6This is a three-dimensional network structure manufacturing apparatus. This realizes a three-dimensional network structure with an irregular cross section..
  The invention according to claim 8 is characterized in that the density is changed in the extrusion direction by changing the speed of the roll or the discharge amount of the extruder. It is a structure manufacturing apparatus.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, as shown in FIG. 1 and FIG. 2 (a), the three-dimensional network structure 1 of the first embodiment uses a recycled thermoplastic resin as a raw material or a main raw material, and a plurality of filaments are randomly entangled in a spiral manner. It is a three-dimensional network structure characterized by being a plate-like three-dimensional network structure thermally bonded. The density on the surface side of the three surfaces of the three-dimensional network structure is relatively higher than the density of the portion excluding the surface side.HighIt is preferable. That is, the three-dimensional network structure 1 of the first embodiment (see FIG. 2A) is a three-sided molding, and a region at a predetermined interval from the other facing one side toward the inside is molded with a high density. The density of the region inside the central portion is set lower than that, and the other surface is uneven. For this reason, the advantage which does not process in a post process arises. That is, a 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 cleanly than the other surfaces.
[0016]
Here, a flake shape or a chip shape of a PET bottle is used as a raw material or main raw material of the recycled thermoplastic resin. A PET bottle is crushed as it is and melted to form a flake. It is also suitable for the era of recycling promotion. If this is not a recycled product, but a genuine product, it will cost 1m for dry crystallization, dust removal, etc.²The manufacturing cost per unit is doubled. Can be used to reduce waste disposal costs. However, it can also be applied to thermoplastic resins other than recycled materials. For example, as thermoplastic resins, polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polyamides such as nylon 66, polyvinyl chloride, polystyrene, copolymers and elastomers based on the above resins, blends of the above resins, etc. Is mentioned. Furthermore, examples of the use of the three-dimensional network structure 1 mainly include an example applied under or inside a cushion material, an impact absorbing material, and a floor material, but can also be applied inside a double wall body. . In the first embodiment, the inside is generally formed to have a uniform density. Apparent density is 0.02-0.9g / cm^Three(Corresponding to a porosity of 36 to 98.4%) is preferred, 0.05 to 0.15 g / cm^ThreeIs particularly preferred. The three-dimensional network structure 1 preferably has a width of 0.1 m to 2 m and a thickness of 5 mm to 200 mm, is endless in the length direction, and is cut into an appropriate length (for example, 900 mm). It is not limited to examples.
[0017]
The three-dimensional network structure 2 (see FIG. 2 (b)) of the second embodiment is a four-sided molding, and all the surfaces are aligned, and the inside from the left and right side surfaces of the three-dimensional network structure 1 of the first embodiment. A region at a predetermined interval toward the surface is formed with a high density, and the density of the region inside the central portion is set lower than that. That is, except for the upper surface and the bottom surface, the regions with predetermined intervals from all the surfaces are formed with high density.
[0018]
The surface of the three-dimensional network structure 3 according to the third embodiment has an irregular surface. For example, 3A provided with a convex surface (see FIG. 3A), 3B provided with a concave surface (see FIG. 3B), 3C provided with a plurality of continuously formed uneven surfaces (FIG. 3). (See (c)), 3D with a plurality of sawtooth surfaces (see FIG. 3 (d)), 3E with a plurality of wavefronts (see FIG. 3 (e)), and with a curved corner (R) shape 3F (see FIG. 3 (f)), 3G (see FIG. 3 (g)) whose corner is cut to a predetermined angle (here 45 degrees), or an appropriate combination thereof, etc. Various types of products are required as products, and this can be accommodated. Moreover, it is thought that various uses arise by setting it as a complicated shape. In particular, various product requirements can be satisfied by forcibly forming three or four surfaces of the three-dimensional network structure as in the first and second embodiments described above. More generally, for a deformed shape required for a product, the required shape is cut or molded in a subsequent process to form a deformed mesh-like body. The product can be provided immediately without finishing the shape and dimensions in the post-process, and the post-process can be eliminated.
[0019]
The three-dimensional network structure 4 (see FIG. 2C) of the fourth embodiment is provided with a single or plural (here, two) hollow portions 4A and 4B, which can further reduce costs. It is the purpose.
[0020]
The three-dimensional network structure 5 (see FIG. 2D) of the fifth embodiment is plate-like in the hollow portions 5A and 5B similar to the hollow portions 4A and 4B of the three-dimensional network structure 4 of the fourth embodiment. Recycled veneers and plate-shaped recycled shredder dust and other recycled members 5C and 5D are placed, and the purpose is to improve sound absorption and the like by the recycled plate material.
[0021]
  The three-dimensional network structure 6 of the sixth embodiment (see FIG. 2E) is a four-sided molding of the three-dimensional network structure 2 of FIG. 2B.InsideIn the division areaIn the width directionA region with increased density is formed, that is, a single or a plurality (three in this case) of beams 6A, 6B, and 6C are formed at predetermined intervals to improve sound absorption and impact resistance.
[0022]
The three-dimensional network structure 7 of the seventh embodiment (see FIG. 2 (f)) has a sound-absorbing property by forming a sheet-like high density portion 7A inside the two-surface molded three-dimensional network structure. It has improved impact resistance.
[0023]
In addition, although not shown in the drawings, the present invention can also be implemented for a cross-sectional shape having a triangular shape such as a triangle shape or a Y-shape.
[0024]
(Three-dimensional network structure manufacturing equipment)
Next, the three-dimensional network-structure manufacturing apparatus 10 will be described.
[0025]
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 horizontal position at a predetermined interval, and a pair of rolls 12 and 13 below the pair of rolls 12 and 13. It is composed of a pair of rolls 14 and 15 (see FIGS. 5 and 6), a drive motor 16 for driving the rolls 12 to 15, a chain and gears. A transmission 17 that changes the moving speed of the rolls 12 to 15, a water tank 18 that partially submerses the pair of rolls 12 and 13 and completely submerses the pair of rolls 14 and 15, a control device 19, and other instruments. ing.
[0026]
Examples of the rolls 12 and 13 include a roll 24 having a circular cross section (see FIG. 7A) and a deformed cross section. For example, a roll 25 having a sawtooth cross section on the outer peripheral surface (see FIG. 7B), a continuously formed concave and convex shape, for example, a roll 26 having an outer peripheral surface having a gear cross section (see FIG. 7C), and an outer peripheral surface A roll 27 (see FIG. 7 (d)) having one or more protrusions 27a (for example, triangular or round protrusions) formed thereon, an elliptical section roll 28 (see FIG. 7 (e)), a triangle or a rice ball Various modifications such as a roll 29 having a cross section (see FIG. 7F) and a polygonal cross section, for example, a roll 30 having an octagonal cross section (see FIG. 7G) are conceivable.
[0027]
As shown in FIG. 6, the rolls 12 to 15 are provided with drive shafts 12a to 15a, respectively. The drive shafts 12a to 15a are rotatably supported by respective bearings 20 (see FIG. 4), and are respectively driven in the direction of the arrow in FIG.
[0028]
  As shown in FIG. 4, the extrusion molding machine 11 includes a container 31, a raw material supply port 32 provided in the upper part of the container 31, a die 33, a base 34 that can be detachably fixed to a lower end portion of the die 33, and the like. The temperature range inside the die of the extruder 11 can be set to 100 to 400 ° C., the extrusion amount can be set to 20 to 200 kg / hour, and the like. The pressure range of the die 33 is 0.2 to 25 MPa, for example, a discharge pressure of a 75 mm screw. When the thickness of the solid network structure exceeds 100 mmGiUniform die pressure by using a pumpConversionis required. Therefore, it is necessary to increase the pressure in the die by a gear pump or the like in order to discharge the filaments uniformly from the entire area inside 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 is structured to be freely movable, the shape (density or diameter of the hole H) of the die 34 of the dice 33 and the conveyance of the rolls 14 and 15. A product having a desired density and strength can be manufactured depending on the speed, and various requirements of the product can be satisfied.
[0029]
Here, the three-dimensional network-structure manufacturing apparatus 50 in the case of a four-side molding machine as shown in FIGS. 8A and 8B will be described. The three-dimensional network-structure manufacturing apparatus 50 includes rolls 52 and 53 having rotating shafts 52a and 53a corresponding to the rolls 12 and 13 in the case of two-surface molding shown in FIG. A pair of rolls 56 and 57 provided with rotatable rotating shafts 56a and 57a in which the rotating shafts and the rotating shafts are arranged orthogonal to each other at the direction ends are arranged. The rotating shaft 52a is provided with bevel gears 52b and 52c, respectively, and the rotating shafts 56a and 57a are also provided with bevel gears 56b and 57b, respectively, and the bevel gears 52b and 52c and the bevel gears 56b and 57b are engaged, 52a and 53a are synchronously driven by the motor M via the chain C. Therefore, the rotary shafts 56a and 57a are also synchronously driven. The other ends of the rotating shafts 56a and 57a are supported by bearings 58a and 58b.
[0030]
As shown in FIG. 8C, a three-dimensional network structure can be manufactured using four-sided molding. Further, as shown in FIG. 8D, three-side molding can be performed using this. That is, if two series of dies are provided depending on the type of the three-dimensional network structure and the filaments are pushed out in parallel, the production efficiency is doubled. In addition, illustration of the motor M is abbreviate | omitted in FIG.8 (c), (d).
[0031]
  As a modification, as shown in FIG. 9, instead of the above-described synchronous drive, a drive source (motor or the like) is provided, and rolls 62 and 63 and rolls 66 and 6 are provided.7 andIt is also possible to adopt a configuration in which these are driven independently. That is, in the case of three-surface or four-surface molding, rolls 62 and 63 having rotation shafts 62a and 63a, and rotatable rotation shafts in which the rotation shafts are arranged orthogonal to the longitudinal ends of these rolls 62 and 63. A pair of rolls 66 and 67 provided with 66a and 67a are arranged. The rotating shafts 66a and 67a are each provided with a motor M and are driven independently. The other ends of the rotary shafts 66a and 67a are supported by bearings 68a and 68b.
[0032]
The hole of the base 34 (see FIG. 4) is a series descending, and there is a hole from which the yarn descends downward. It may be equally spaced or non-equally spaced. The holes can have various arrangements such as a staggered shape or an orthogonal shape. When it is desired to change the arrangement density, a method of actively increasing the density only in the end region may be used. Various requirements of products can be satisfied by variously changing the shape of the base. For example, a base 71 in which about 3500 holes H having a diameter of 0.5 mm are formed at approximately equal intervals in an area of 1.0 m × 180 mm (the range of the size of the area provided with the holes H of the base is the area of the base 71) (See FIG. 10 (a)), the base 72 (see FIG. 10 (b)) in which the density of the holes H is increased only in the peripheral portion 72a, and the density of the frame-like portion 73a so as to form a grid-like region. A base 73 (see FIG. 10 (c)) with an increased height, and a base 74 (see FIG. 10 (d)) in which slits (straight through grooves) 74 a to 74 c are formed in parallel to the short direction in addition to the numerous holes H. In addition to the numerous holes H, a base 75 (see FIG. 10E) in which a slit (through-line groove) 75a is formed in the center in the longitudinal direction, and in addition to the numerous holes H, slits (through-line) Base 76 formed in a position close to the side in the longitudinal direction (see FIG. 10F) In order to create a hollow portion, regions 77c and 77d in which holes H are not provided are formed in the corresponding portions, and rectangular guide members (pipe and the like) 77a and 77b extending downward are provided below the regions. Many specifications such as a base 77 (see FIGS. 10G and 10H) can be implemented. The density of the holes H formed in the die is 1 to 5 / cm.²Is preferred. From the slit, a sheet in which filaments are entangled with each other is formed.
[0033]
  (Method for producing a three-dimensional network structure)
  The three-dimensional network structure 1 is manufactured as follows. First, recycled PET bottle flakes may be heated and dried to prevent hydrolysis, and an agent for improving the finish or an antibacterial agent may be added thereto. When the filament descends flat from the base 34, rolls 14 and 15WhenThe rolls 12 and 13 are wound spirally by the winding action. When it rolls, it rolls in from the place which contacted the surface of the rolls 12 and 13. The part that is caught is high in density, and the part that is not caught is low in density.
[0034]
  Next, as shown in FIG. 5, the molten thermoplastic resin is extruded downward from a plurality of dies 33, and is naturally lowered between a pair of submerged rolls 12 and 13 and is taken slower than the above-described lowering speed. When manufacturing the three-dimensional network structure 1 which is a three-dimensional network structure, the distance between the pair of rolls 12 and 13 is narrower than the width of the extruded molten resin aggregate, and the rolls 12 and 13 are submerged. Both before and after the molten resin aggregateFaceThe rolls 12 and 13 were brought into contact. Further, the three-dimensional network structure 1 is sent out by the rolls 14 and 15.
[0035]
  Both molten thermoplastic aggregatesPlaneSince the surface portion falls on the rolls 12 and 13 and moves to the inside of the molten thermoplastic resin aggregate to become a dense state, the porosity is smaller than that of the central portion that is dropped in water as it is. Naturally, the surface portion where the porosity is low has more intersections than the central portion where the porosity is high, and the tensile strength is significantly increased. Further, 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.
[0036]
In order to function as the three-dimensional network structure 1, the result was that the overall porosity was good in the range of the porosity of 80% to 98%, depending on the field construction situation to be used. . 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, when the porosity is less than 80%, the impact absorbing effect and the soundproofing effect are not improved as expected. About this porosity, it is good to design suitably in 80% or more and 98% or less of range according to the use of the solid network structure 1.
[0037]
The surface portion of the three-dimensional network structure 1 has a low porosity, and is approximately a few millimeters from the surface at a distance from 1 to 3 times the filament diameter. Due to the structure of the three-dimensional network structure 1 of the present invention, the surface portion is densely lined, and there is also a portion where the line is overlapped. In the range where the porosity is 98% or less, the line is The part which overlapped to about 3 was able to be confirmed. In addition, the line diameter is the diameter when the cross-sectional shape of the line constituting the three-dimensional network structure 1 is circular, and when the cross-sectional shape is not circular such as a square, the cross-section is circular. It is the diameter obtained from the cross-sectional area assuming that.
[0038]
As the thermoplastic resin used here, a PET bottle is pulverized into flakes as a raw material or a main raw material. However, there is no problem as long as the resin can be processed with a normal extrusion molding machine, such as a polymer such as polypropylene or a blend of a plurality of polymers as the main raw material.
[0039]
  The process of making the deformed three-dimensional network into a product shape has a structure in which the internal pressure of the die is made uniform and the take-up surface is drawn by two, three, four, or intermediate portions. As a result, an apparent density of 0.02 to 0.9 g / cm^ThreeThe melted filament is changed from a disordered spiral shape to a flat plate shape, and the surface portion of the three-dimensional network structure on the front surface, rear surface, left end surface, and right end surface in the thickness direction is flat and unevenly shaped. It is characterized by that. Combination of die shape for forming three-dimensional network structure with round bar, irregular shape (pipe, Y shape), etc.ByA variety of three-dimensional network structures are possible. Further, the three-dimensional network structure is made into a super dense structure sheet structure by roll compression of a take-up machine. Because recycled PET resin is uniformly discharged from the dieInUniform pressure inside the dieAnd alsoThree or four sides of a molten resin aggregate extruded during the production of a three-dimensional network sheetThe rollShape formation withBecause of the rollTo come into contact. In other words, an aggregate of molten recycled PET resinof3-sided or 4-sided surfaceTheMake the shape corresponding to the product shape. For example, if necessary, such as a polygonrollThe resin assembly is taken up to form a product. One of the methods for obtaining a three-dimensional network sheet is a molten resinTheExtruded downward from multiple dies, submerged in water or partiallyrollBy letting it fall naturally between the two, a disordered spiral shape is created and a three-dimensional mesh sheet is formed.
  When the sheet width is 1.0 m and the thickness is 100 mm, BIt was confirmed that the density was changed by changing the speed of the tool.
  Furthermore, it was confirmed that the density changed due to the change of the discharge amount of the extruder.
[0040]
A die 34 having an area of 1.0 m × 180 mm and a die 34 having a diameter of 0.5 mm and having approximately 3500 holes H at approximately equal intervals were attached to a single screw extruder having a screw diameter of 75 mm. A water tank 18 having a water level is installed at a position of about 120 mm below the die 33, and a pair of rolls 12 and 13 having a width of 1.2 m are spaced apart by 50 mm so that the upper part of the rolls 12 and 13 comes out of the water surface by about 40 mm. Installed almost vertically. Further, the rolls 14 and 15 having a width of 1.2 m were set to be completely submerged vertically below the rolls 12 and 13.
[0041]
With this apparatus, the temperature of the die 33 is controlled so that the resin temperature becomes 240 ° C. while plasticizing the recycled PET resin by applying heat, and the molten resin discharged from the die 34 at an extrusion amount of 120 kg per hour is controlled. The assembly was extruded between them so that both sides of the assembly fell on rolls 12 and 13. The take-up speed of the rolls 12 and 13 at this time was 0.7 m / min. The molded product sandwiched between the rolls 12 and 13 and moved downward is turned by the rolls 14 and 15 at the bottom of the water tank 18, moved to the water surface from the side opposite to the extruder, and exited from the water tank 18. At that time, moisture was blown off with compressed air or a vacuum pump.
[0042]
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 to 0.14 g / cm.^Threewas gotten. Uses such as a heat insulating material, a base material, a sound absorbing material, and a drain pipe are mentioned.
[0043]
According to the three-dimensional network structure 1 described above, the finishing device in the subsequent process is unnecessary, the degree of alignment is increased, the shape of the three-dimensional network structure can be improved, and the durability can be improved. Can provide.
[0044]
Further, according to the present embodiment, it is considered that a PET bottle which is not currently used can be used as a three-dimensional network structure, and the recovery rate of the PET bottle is increased. This greatly facilitates PET bottle recycling.
[0045]
FIG. 11 shows a modified form of the four-sided three-dimensional network structure manufacturing apparatus 50. FIG. 11 corresponds to FIG. 8B, and the pair of rolls 56 and 57 (or the rolls 12 to 15 described above). One or a plurality of protrusions 60a to 60c are formed on at least one surface (the roll 57 and its protrusions are not shown). This is to form a dent on the side surface of the three-dimensional network structure. The protrusions 60a to 60c of the rolls 56 and 57 are formed in an arc shape with a square cross section. Theoretically, the dent should be square, but the resin thread falls from the top as described above, so a blind can be made, and in reality, there is an area that does not contain the resin thread. The dent on the side surface of the structure is curved. In other words, it feels like taking an Earl. In addition, a cam and a spring are put in the rotating body of the rolls 56 and 57 or the rolls 62 and 63, and the cam is pushed out in synchronism with the rotation. This can also reduce the blinds and form a more precise recess. Since the other structure is the same as that of FIG. 8B, illustration and description are incorporated.
[0046]
The present invention is not limited to the above-described embodiments, and modifications and the like can be made without departing from the technical idea of the present invention. Etc. are also included in the technical scope of the present invention. For example, as shown in FIG. 12, one lower roll may be deleted and three rolls 82, 83, and 84 may be provided.
[0047]
【The invention's effect】
According to the first to eighth aspects of the present invention, inconvenience due to the deformation of the endless belt is avoided, finishing in the subsequent process is not required, the degree of alignment is increased, and it is possible to cope with the irregular shape, and the durability is improved. A manufacturing method and apparatus for a three-dimensional network structure can be provided, 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. 2C is a fourth embodiment. (D) is a sectional view of the three-dimensional network structure of the fifth embodiment, (e) is a sectional view of the three-dimensional network structure of the sixth embodiment, and (f) is a sectional view of the three-dimensional network structure of FIG. It is sectional drawing of the solid 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 an 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.
FIGS. 6A and 6B are a side view and a front view of a roll of the same three-dimensional network structure manufacturing apparatus.
7 (a) to (g) are the same three-dimensional network structure manufacturing apparatus.ofIt is a side view of the roll of a change form.
8A is a plan view of a roll of a three-dimensional network structure manufacturing apparatus in the case of four-side molding, FIG. 8B is a side view of the three-dimensional network structure manufacturing apparatus, and FIG. 8C is the three-dimensional network structure. The top view which shows the mode of the four-surface molding by a structure manufacturing apparatus, (d) is a top view which shows the mode of the three-surface molding by the same solid network structure manufacturing apparatus.
FIG. 9 is a plan view of a roll of a three-dimensional mesh structure manufacturing apparatus having an independent drive structure in the case of four-side molding.
FIGS. 10A to 10H are a plan view and a front view showing various forms of a die base. FIGS.
FIG. 11 is a front view of a roll of a three-dimensional mesh structure manufacturing apparatus for four-sided molding according to a modified embodiment.
FIG. 12 is a front view of a three-dimensional network structure manufacturing apparatus for two-sided, three-sided, or four-sided molding according to a modified embodiment.

Claims (8)

Extruded from a die having a die having a molten filament of the plurality of holes of the thermoplastic resin as a raw material or a main raw material tip downward and submerged part, and naturally drop between b Lumpur,該降under speed When producing a three-dimensional network structure by slowly drawing the filament, there are two pairs of the rolls facing each other, and a quadrilateral is formed in a direction perpendicular to the extrusion direction by the two pairs of rolls, spacing of the rolls to the opposed than the width of the collection of the extruded filament is set narrow by four sides all of the periphery of the assembly of the filament before and after the roll is submerged is in contact with the roll Molded,
The method for producing a three-dimensional network structure, characterized in that the density on the surface side of all four outer peripheral surfaces parallel to the extrusion direction is relatively higher than the density of the portion excluding the surface side . 2. The method for producing a three-dimensional network structure according to claim 1 , wherein a closed portion is formed in the die so that a hollow portion of the aggregate of the filaments is formed before and after the roll is submerged . When the longitudinal direction of the quadrilateral formed in the direction perpendicular to the extrusion direction by the two pairs of rolls is the width direction,
3. A high density area and a low density area of holes are formed in the die so that the roll assembly can be densely packed in the width direction before and after the roll is submerged. method of producing a three-dimensional network structure according to. The method for producing a three-dimensional network structure according to any one of claims 1 to 3, wherein the density is changed in the extrusion direction by changing a speed of the roll or a discharge amount of an extruder. An extrusion machine that includes a die having a die having a plurality of holes at the tip, and that extrudes a molten filament made of a thermoplastic resin as a raw material or a main raw material downward from the die;
A tank,
Two pairs of opposed rolls partially submerged in the aquarium,
A quadrilateral is formed in the direction perpendicular to the extrusion direction by the two pairs of rolls,
The wire is lowered between the rolls, and the speed of the roll is set so that the wire is drawn slower than the descending speed,
The interval between the rolls facing each other is set narrower than the width of the aggregate of the extruded filaments,
Before and after the roll is submerged, all four surfaces of the outer periphery of the aggregate of the filaments are formed by contacting the roll ,
The three-dimensional network-structure manufacturing apparatus , wherein the density on the surface side of all four outer peripheral surfaces parallel to the extrusion direction is relatively higher than the density of the portion excluding the surface side . Before SL steric network structure manufacturing apparatus according to claim 5 which is characterized in that the formation of the closed portion to the mouthpiece so that the hollow portion of the assembly of the filament back and forth is formed the roll is submerged. When the longitudinal direction of the quadrilateral formed in the direction perpendicular to the extrusion direction by the two pairs of rolls is the width direction,
7. The high density area and the low density area of the holes are formed in the die so that the rolls can be densely packed in the width direction before and after the roll is submerged. three-dimensional net-like structure manufacturing device. The three-dimensional network-structure manufacturing apparatus according to claim 5 , wherein the density is changed in the extrusion direction by changing the speed of the roll or the discharge amount of the extruder .

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