Die, die manufacturing method, extrusion device, and pellet manufacturing method

Abstract

To provide a die with improved performance and an extruder comprising the die with improved performance.SOLUTION: A die 6 comprises a central member 6a, an injection hole formed from the surface of the central member 6a to the inside, a plurality of nozzles formed from the opposite surface of the central member 6a to the inside and connected to the injection hole, a heat source provided inside the central member 6a, and a plurality of insulation parts 31a provided inside the central member 6a. The plurality of insulation parts 31a extends from the outer peripheral side of the central member 6a toward the inside of the central member 6a in plan view.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a die, a method for manufacturing a die, an extrusion apparatus equipped with a die, and a method for manufacturing pellets using the extrusion apparatus, and can be suitably used for a die having a heat insulating layer, for example. [Background technology]

[0002] Conventionally, when pelletizing filler-containing thermoplastic resins (such as polypropylene (PP) compounds), there has been a problem with the phenomenon of the molten resin solidifying in the nozzle holes (clogging) when the molten resin passes through the nozzle holes provided inside the die.

[0003] For example, Patent Document 1 discloses a technique for providing an air chamber for thermal insulation between the die surface and the cover plate around a nozzle hole provided inside the die plate body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special table number 2012-500131 Summary of the Invention [Problem to be solved by the invention]

[0005] By providing an insulating layer inside the die, it is expected that the phenomenon of the resin solidifying in the nozzle hole inside the die (clogging) can be suppressed when the molten resin passes through the nozzle hole inside the die. However, if the insulating layer provided inside the die is small, the effect of suppressing the phenomenon of the resin solidifying in the nozzle hole is small. On the other hand, if the insulating layer provided inside the die is large, the strength of the die is reduced, and there is a risk of the occurrence of problems associated with this. Therefore, it is desirable to achieve both the performance and strength of the die.

[0006] Other objects and novel features will become apparent from the description of this specification and the accompanying drawings. [Means for solving the problem]

[0007] The die in one embodiment includes a first member made of a first metallic material, an injection hole formed from a surface of the first member to an interior of the first member, a plurality of nozzles formed from a surface opposite to the surface to an interior of the first member and connected to the injection hole, a heat source provided inside the first member, and a plurality of first heat insulating portions provided inside the first member. The plurality of first heat insulating portions extend from an outer periphery side of the first member toward the inside of the first member in a plan view. Effect of the Invention

[0008] According to one embodiment, it is possible to improve the performance of the die and the performance of the extrusion device equipped with the die, and also to improve the quality of the pellets produced by using the extrusion device. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic diagram showing an extrusion device according to one embodiment. [Diagram 2] FIG. 2 is a plan view showing a die according to an embodiment. [Diagram 3] FIG. 2 is a plan view perspective view showing a die according to one embodiment. [Figure 4] FIG. 2 is a plan view perspective view showing a die according to one embodiment. [Diagram 5] FIG. 2 is a cross-sectional view showing a die according to one embodiment. [Figure 6] FIG. 4 is a partially enlarged view showing a part of FIG. 3. [Figure 7] FIG. 2 is a cross-sectional view showing a die according to one embodiment. [Figure 8] FIG. 8 is a partially enlarged view showing a part of FIG. 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the embodiments will be described in detail with reference to the drawings. In all the drawings for explaining the embodiments, the same reference numerals are used for the members having the same functions, and the repeated explanations are omitted. In the following embodiments, the explanations of the same or similar parts will not be repeated as a rule unless it is particularly necessary.

[0011] In addition, in the drawings used in the embodiments, in order to make the drawings easier to understand, hatching may be omitted even in cross-sectional views, and hatching may be applied even in plan views.

[0012] (Embodiment) <Example of extrusion device configuration> Fig. 1 is a schematic diagram showing an extrusion device (extruder) 1 in the present embodiment. In Fig. 1, for ease of understanding, a screw 3 built into a cylinder 2 is shown in a see-through manner.

[0013] First, a schematic configuration of the extrusion device 1 will be described with reference to FIG. 1. The extrusion device 1 shown in FIG. 1 has a cylinder (barrel) 2, a screw 3 rotatably (rotatably) arranged in the cylinder 2, a rotation drive mechanism 4 for rotating the screw 3 in the cylinder 2, a hopper (resin input section) 5 arranged on the upstream side (rear end side) of the cylinder 2, and a die (die, metal mold) 6 attached to the tip end (downstream end) of the cylinder 2. The hopper 5 is connected to the upper surface of the cylinder 2, and a resin material can be supplied into the cylinder 2 through the hopper 5. The temperature of the cylinder 2 is controlled by a temperature adjustment means (temperature adjustment mechanism) such as a heater (not shown). The extrusion device 1 may further have a filler supply device (not shown) connected to the cylinder 2, in which case a desired filler can be supplied from the filler supply device into the cylinder 2. The extrusion device 1 may further have a liquid injection nozzle (not shown) connected to the cylinder 2, in which case a desired additive or the like can be supplied from the liquid injection nozzle into the cylinder 2.

[0014] In addition, when referring to the "downstream side" and the "upstream side" in relation to the extrusion device 1, the "downstream side" means the downstream side of the resin flow in the extrusion device 1, and the "upstream side" means the upstream side of the resin flow in the extrusion device 1. Therefore, in the extrusion device 1, the side closer to the extrusion surface 21b of the die 6 is the downstream side, and the side farther from the extrusion surface 21b of the die 6, i.e., the side closer to the hopper 5, is the upstream side.

[0015] Two screws 3 are rotatably (freely rotatably) inserted and built into the cylinder 2. For this reason, the extrusion device 1 can also be considered as a twin-screw extrusion device (twin-screw extruder). In the cylinder 2, the two screws 3 are arranged to mesh with each other and rotate. The longitudinal direction (long side direction, axial direction, extension direction) of the cylinder 2 and the longitudinal direction (long side direction, axial direction, extension direction) of the screws in the cylinder 2 are the same.

[0016] In this embodiment, the case where the number of screws 3 in the cylinder 2 is two has been described, but as another embodiment, the number of screws 3 in the cylinder 2 can be one. However, when the number of screws 3 in the cylinder 2 is two, a larger spatial volume can be secured, so that for the same screw diameter, a twin-shaft (two screws 3) can provide a higher raw material supply capacity than a single-shaft (one screw 3).

[0017] The die 6 can function to mold the molten resin extruded from the cylinder 2 of the extrusion device 1 into a predetermined cross-sectional shape (here, a string shape) and discharge it. For this reason, the die 6 is a die (die, metal mold) for extrusion molding.

[0018] In this application, "melting" is not limited to melting by heat, but also includes melting by a solvent, etc. Therefore, not only melting a resin by heating, but also melting a resin by a solvent or by microwaves can be included in the "molten resin". Liquid resin can also be included in the "molten resin".

[0019] The tip end (downstream end) of the cylinder 2 is connected to a die 6. The die 6 of the extrusion device 1 is attached to a pelletizer 13 including a water tank (circulation box) 11 and a cutter holder 12. The pelletizer 13 can also be considered as a part of the extrusion device 1.

[0020] The die 6 has an injection surface (upstream surface) 21a and an extrusion surface (downstream surface) 21b, which are surfaces located opposite each other, and the injection surface 21a of the die 6 is connected to the tip of the cylinder 2, and the extrusion surface 21b of the die 6 is disposed in the water tank 11. The inside of the water tank 11 is filled with a liquid called pellet circulating water (PCW). The liquid constituting the pellet circulating water is, for example, water.

[0021] The cutter holder 12 is provided inside the water tank 11 and disposed near the extrusion surface 21b of the die 6. A plurality of cutters (cutting blades) are provided on the cutter holder 12 so as to face the extrusion surface 21b of the die 6, and the resin material extruded from the extrusion surface 21b is cut by the cutters in the pellet circulating water and individualized as a plurality of pellets (resin pellets) 14.

[0022] <Pellet manufacturing method> The method for producing the pellets will be described with reference to FIG.

[0023] In the extrusion device 1, the resin material (thermoplastic resin) supplied from the hopper 5 into the cylinder 2 is melted (i.e., becomes molten resin) while being sent forward in the cylinder 2 by the rotation of the screw 3. When a filler is supplied from a filler supply device (not shown) into the cylinder 2, the resin (molten resin) and the filler are kneaded in the cylinder 2 of the extrusion device 1 by the rotation of the screw 3, so that the molten resin in the cylinder 2 contains the filler.

[0024] In the extrusion device 1, the molten resin (resin material) sent forward in the cylinder 2 by the rotation of the screw 3 is extruded from the die 6 attached to the tip of the cylinder 2. The die 6 has a nozzle 24 protruding from the rear for discharging the molten resin, and the molten resin is extruded (discharged) from the nozzle 24 of the die 6. The die 6 of the extrusion device 1 is connected to a water tank 11, which is filled with pellet circulating water. Therefore, the molten resin is extruded from the nozzle 24 of the die 6 of the extrusion device 1 into the pellet circulating water in the water tank 11. The molten resin (resin material) extruded from the nozzle 24 of the die 6 into the pellet circulating water in the water tank 11 is cut one after another by a cutter attached to the cutter holder 12, and is cooled by the pellet circulating water to solidify (set). As a result, pellets (resin pellets) 14 are formed (molded). The pellets 14 are then transferred to the outside of the water tank 11. In this manner, a plurality of pellets 14 can be obtained using the extrusion device 1 of the present embodiment.

[0025] In the present embodiment, the case where the molten resin (resin material) is extruded from the nozzle 24 of the die 6 into the water tank 11 (pellet circulating water) and cut with a cutter has been described. As another embodiment, the water tank 11 may not be provided, and the molten resin (resin material) may be extruded from the nozzle 24 of the die 6 into the air (outside the die 6) and cut with a cutter.

[0026] <About the structure of the die> The structure of the die 6 in this embodiment will be described with reference to Figs. 2 to 8. Fig. 2 is a plan view of the die 6 as viewed from the extrusion surface 21b side. Although Fig. 2 is a plan view, the hard plate 6c is hatched with dots to make the drawing easier to see. Figs. 3 and 4 are plan perspective views of the die 6 as viewed from the extrusion surface 21b side. In Fig. 3, the heat insulating layer 31 in the die 6 is shown hatched with dots. In Fig. 4, the heat source 26 and the heat sensor 27 in the die 6 are shown hatched with dots. Fig. 5 is a cross-sectional view of the die 6. The cross-sectional view at the position of the line AA shown in Figs. 2 to 4 corresponds approximately to Fig. 5. Fig. 6 is a partially enlarged view of Fig. 3. Fig. 7 is a cross-sectional view of the die 6, and Fig. 8 is a partially enlarged view (partially enlarged cross-sectional view) of Fig. 7.

[0027] In the present application, when describing the structure of the die 6, the term "plane" refers to a plane parallel to the extrusion surface 21b or the injection surface 21a, and the term "planar view" refers to viewing from the extrusion surface 21b side or the injection surface 21a side. The term "cross section" refers to a plane approximately perpendicular to the extrusion surface 21b or the injection surface 21a, and the term "cross-sectional view" refers to viewing the perpendicular plane. For the sake of convenience, the present application may also describe each configuration with the injection surface 21a side as the lower side and the extrusion surface 21b side as the upper side in the cross-sectional view.

[0028] In addition, in the present application, "injection surface 21a" refers to the entire surface of die 6 on the side connected to cylinder 2 (i.e., the upstream side), and "extrusion surface 21b" refers to the entire surface of die 6 on the side connected to water tank 11 (i.e., the downstream side). More specifically, "injection surface 21a" refers to the surface of die 6 where injection hole 25 opens, and "extrusion surface 21b" refers to the surface of die 6 where nozzle 24 opens, or the surface of hard plate 6c where nozzle 24 opens.

[0029] As shown in Figs. 2 to 8, the die 6 has a central member 6a and an outer peripheral member 6b surrounding the central member 6a. The outer peripheral member 6b surrounds the central member 6a in a plan view. The central member 6a and the outer peripheral member 6b are separately manufactured members, and are joined to each other by welding or the like to be integrated. That is, the outer peripheral member 6b is joined to the central member 6a so as to surround the central member 6a in a plan view. The central member 6a and the outer peripheral member 6b are each made of a metal material (e.g., stainless steel), but may be made of different materials (different types of stainless steel).

[0030] The die 6 is provided with connecting holes 22, 23 for connecting to other members (e.g., the cylinder 2). Here, one connecting hole 22 is provided in the center of the central member 6a so as to penetrate the central member 6a, and four connecting holes 23 are provided in the outer peripheral member 6b so as to penetrate the outer peripheral member 6b. As shown by dashed lines in Fig. 5, the die 6 and the cylinder 2 are connected by providing connecting members 22a, 23a such as bolts in the respective connecting holes 22, 23.

[0031] In addition, since the cutter provided on the cutter holder 12 is movable on the extrusion surface 21b side, the surrounding areas of the connecting holes 22, 23 are formed to be recessed toward the injection surface 21a side more than other areas so that the connecting members 22a, 23a do not protrude from the die 6 and are not cut off.

[0032] The die 6 further includes a hard plate (plate member) 6c provided on the surface of the central member 6a on the extrusion surface 21b side. The hard plate 6c is made of a material harder than the material (metal material) constituting the central member 6a. That is, the hard plate 6c has a higher hardness than the (metal material constituting) the central member 6a. The hard plate 6c is made of a material harder than the material (metal material) constituting the outer peripheral member 6b. The hard plate 6c is made of a material containing titanium carbide (TiC), for example, and has a thickness of 1 to 5 mm, for example. The hard plate 6c and the central member 6a are joined to each other by brazing, for example, using a self-fluxing alloy. By providing such a hard plate 6c on the extrusion surface 21b side, it is possible to suppress the risk of the central member 6a being cut by a cutter provided in the cutter holder 12.

[0033] Further, the central member 6a and the hard plate 6c are provided with a plurality of nozzles (holes) 24. Each nozzle 24 has a portion formed in the central member 6a and a portion formed in the hard plate 6c, and the two are in communication with each other. That is, the nozzle 24 in the central member 6a and the nozzle 24 in the hard plate 6c are in communication with each other to form an integrated nozzle. Therefore, the nozzle 24 penetrates the hard plate 6c. Further, the central member 6a is provided with a plurality of injection holes 25, and the plurality of nozzles 24 are in communication with each injection hole 25 (are spatially connected). Therefore, the end (upstream end) of each nozzle 24 is connected (connected) to the injection hole 25.

[0034] 2 to 4, central member 6a is provided with four injection holes 25, and 11 nozzles 24 communicate with each injection hole 25, for a total of 44 nozzles 24. The number of nozzles 24 communicating with each injection hole 25 is not limited to 11 and can be any number (preferably multiple). Furthermore, the number of injection holes 25 provided in central member 6a is preferably four, but can be any number other than four (single or multiple).

[0035] In the extrusion device 1, the molten resin sent forward (downstream) inside the cylinder 2 by the rotation of the screw 3 is injected from the cylinder 2 into the die 6. At this time, the molten resin is injected into the injection hole 25 on the injection surface 21a side. The molten resin injected into the injection hole 25 from the cylinder 2 passes through a nozzle 24 communicating with the injection hole 25, and is extruded from the extrusion surface 21b to the outside of the die 6 (specifically, the water tank 11).

[0036] Pouring hole 25 is formed from the surface of central member 6a on the pouring surface 21a side to the inside of central member 6a, has a relatively wide opening area, and is connected to a plurality of nozzles 24.

[0037] Nozzle 24 penetrates hard plate 6c, is formed from the surface of central member 6a on the extrusion surface 21b side to the inside of central member 6a, and is connected to casting hole 25. The opening area (opening diameter) of nozzle 24 is smaller than the opening area of ​​casting surface 21a.

[0038] As shown in Figures 4 and 5, die 6 is also provided with multiple heat sources (heaters) 26 for mainly heating the areas around casting hole 25 and nozzle 24, and thermal sensors 27 for measuring the heating temperatures generated by multiple heat sources 26.

[0039] Each heat source 26 is provided so as not to be in direct contact with injection hole 25 and nozzle 24, and therefore each heat source 26 is provided at a position that does not overlap injection hole 25 and nozzle 24 in a plan view. Furthermore, if adjacent heat sources 26 are arranged to sandwich injection hole 25 in a plan view, the molten resin passing through injection hole 25 and nozzle 24 can be efficiently heated by the heat from heat source 26.

[0040] The heat source 26 is composed of holes formed in the outer peripheral member 6b and the central member 6a, and a heating mechanism provided inside the holes. Examples of such heating mechanisms include an electric heater using a coil or a heat transfer rod, hot oil, or steam. In Figs. 4 and 5, a structure assuming the use of an electric heater (cartridge heater) is adopted as an example of the heat source 26. When hot oil or steam is used as the heating mechanism, for example, the tips of two adjacent holes (holes constituting the heat source 26) can be connected via a thermal sensor 27, and these can be used as a circulation path. In that case, one of the holes can be used as an inlet and the other hole can be used as an outlet. Such connected holes and the hot oil or steam circulating inside the holes can also be adopted as the heat source 26.

[0041] As shown in FIG. 3 and FIG. 5 to FIG. 8, the die 6 is provided with a heat insulating layer (heat insulating portion) 31.

[0042] The heat insulating layer 31 is formed by holes provided in the die 6. That is, the heat insulating layer 31 is formed by cavities (spaces) in which the metal material constituting the die 6 does not exist. The pressure of the gas in the holes (cavities) constituting the heat insulating layer 31 is preferably atmospheric pressure or reduced pressure or vacuum lower than atmospheric pressure. It is also possible to make the pressure of the gas in the holes (cavities) constituting the heat insulating layer 31 higher than atmospheric pressure, but in that case, it becomes difficult to form the heat insulating layer 31. In addition, when the pressure of the gas in the holes (cavities) constituting the heat insulating layer 31 is reduced pressure or vacuum, the heat insulating effect of the heat insulating layer 31 can be enhanced compared to when the pressure is atmospheric pressure.

[0043] A specific gas (air) is present (filled) in the holes (cavities) constituting the insulating layer 31, and air, nitrogen gas, inert gas (e.g., argon gas), etc. can be used as the gas in the holes (cavities) constituting the insulating layer 31. It is preferable that the holes (cavities) constituting the insulating layer 31 are not connected to the space outside the die 6 and are sealed.

[0044] It is also possible to fill the holes (cavities) constituting the insulating layer 31 with a liquid or solid instead of a gas. However, filling the holes (cavities) constituting the insulating layer 31 with a gas is more preferable than filling the holes (cavities) constituting the insulating layer 31 with a liquid or solid, because it is easier to form the insulating layer 31 and also easier to enhance the insulating effect of the insulating layer 31. In any case, the insulating layer 31 has a lower thermal conductivity than the material constituting the central member 6a, the material constituting the outer peripheral member 6b, and the material constituting the hard plate 6c. Since the insulating layer 31 has a lower thermal conductivity than the material surrounding the insulating layer 31, it can function to prevent the transfer (conduction) of heat in the die 6. In other words, it is possible to suppress or prevent the transfer (conduction) of heat through the insulating layer 31 in the die 6.

[0045] The main feature of this embodiment is the arrangement and shape of the heat insulating layer 31 provided on the die 6, which will be described in more detail later. In this embodiment, the arrangement and shape of the heat insulating layer 31 provided on the die 6 are devised to enhance the heat insulating effect of the heat insulating layer 31 and suppress the decrease in strength of the die 6 due to the provision of the heat insulating layer 31. This makes it possible to appropriately suppress or prevent clogging caused by a decrease in temperature of the resin material inside the nozzle 24 of the die 6, and to prevent defects that may occur when the strength of the die 6 is decreased. Therefore, the performance of the die 6 and the performance of the extrusion device 1 equipped with the die 6 can be improved. In addition, the quality of the resin product (pellets in this case) manufactured using the extrusion device 1 can be improved.

[0046] <About the process of the review> As described above, the resin material kneaded inside the cylinder 2 is extruded from the extrusion surface 21b of the die 6 (specifically, from the nozzle 24) into the water tank 11 and is cut into a plurality of pellets 14 by a cutter provided on the cutter holder 12. At this time, the inside of the water tank 11 is filled with pellet circulating water (e.g., water), and the temperature of the pellet circulating water is, for example, about 60°C. The resin material extruded from the nozzle 24 of the die 6 into the water tank 11 is cooled by the pellet circulating water near the extrusion surface 21b, and is hardened to a certain degree of hardness or becomes highly viscous, so that it can be easily cut by the cutter.

[0047] On the other hand, it is preferable that the viscosity of the resin material is relatively low inside each of injection hole 25 and nozzle 24 of die 6 so that the resin material can be stably extruded from nozzle 24 of die 6 into water tank 11. For this reason, die 6 is provided with a plurality of heat sources 26, and the temperature of each heat source 26 is set to a temperature suitable for the type of resin. The viscosity of the resin material changes depending on the temperature of the resin material.

[0048] Here, since the hard plate 6c is in direct contact with the water tank 11, in a region extending to a certain depth from the surface of the hard plate 6c, the cooling effect from the water tank 11 is more prominent than the heating effect from the heat source 26. The opening diameter of the nozzle 24 (opening diameter on the extrusion surface 21b), which determines the size of the pellets 14, is quite small, for example, about 1 to 4 mm. Therefore, when the resin material hardens inside the nozzle 24, it becomes difficult for the resin material to be extruded from the nozzle 24, and clogging occurs inside the nozzle 24.

[0049] Furthermore, the die 6 is provided with a plurality of nozzles 24, and if there is variation in the ambient temperature of each nozzle 24, the degree of clogging in each nozzle 24 is likely to vary. There may be a mixture of unclogged nozzles 24 and clogged nozzles 24. This will result in variation in the size of the pellets 14 extruded from the nozzles 24 of the die 6, making it difficult to manufacture pellets 14 of a uniform size. For this reason, it is necessary to suppress or prevent the occurrence of clogging in each nozzle 24 of the die 6.

[0050] Therefore, in die 6, it is preferable that the viscosity of the resin material is low up to the region as close to water tank 11 as possible, and it is preferable that the resin material is cured or the viscosity of the resin material is increased to a level suitable for cutting just before being extruded into water tank 11. For example, in nozzle 24 of die 6, it is preferable that the viscosity of the resin material is low in the region close to injection hole 25, and it is preferable that the viscosity of the resin material is increased to a level suitable for cutting or the resin material is cured in the region close to extrusion surface 21b (i.e., the region near the tip of nozzle 24).

[0051] Therefore, the present inventors have considered providing a heat insulating layer (corresponding to the heat insulating layer 31) in the die 6. By providing a heat insulating layer, the cooling effect from the water tank 11 can be blocked by the heat insulating layer, so that the viscosity of the resin material can be reduced in the die 6 up to the region close to the water tank 11. When a heat insulating layer is provided in the die 6, it is desirable to enhance the heat insulating effect of the heat insulating layer. This is because, even if a heat insulating layer is provided in the die 6, if the heat insulating effect of the heat insulating layer is low, it becomes difficult to reduce the viscosity of the resin material in the die 6 up to the region close to the water tank 11, and clogging of the nozzle 24 cannot be prevented.

[0052] In this way, by providing a heat insulating layer inside the die 6, it is expected that the phenomenon in which the resin solidifies (clogging) in the nozzle 24 inside the die 6 when the molten resin passes through the nozzle 24 is suppressed. However, if the amount of heat insulating layer provided inside the die 6 is small, the effect of suppressing the phenomenon in which the resin solidifies (clogging) in the nozzle 24 is reduced. On the other hand, if too many heat insulating layers are provided inside the die 6, the strength of the die 6 is reduced, and there is a concern that problems may occur as a result.

[0053] <Main features and effects> The die 6 includes a central member 6a, an injection hole 25 formed from the surface of the central member 6a on the injection surface 21a side to the inside of the central member 6a, a plurality of nozzles 24 formed from the surface of the central member 6a on the extrusion surface 21b side to the inside of the central member 6a and connected to the injection hole 25, a heat source 26 provided inside the central member 6a, and an insulating layer 31 provided inside the central member 6a.

[0054] The first feature of this embodiment is that the heat insulating layer 31 includes a plurality of heat insulating portions 31a extending from the outer periphery of the central member 6a toward the inside of the central member 6a in a plan view. That is, a plurality of heat insulating portions 31a extending from the outer periphery of the central member 6a toward the inside of the central member 6a in a plan view are provided inside the central member 6a. Specifically, a plurality of heat insulating portions 31a extend radially from the center side of the central member 6a toward the outer periphery of the central member 6a in a plan view. A plurality of heat insulating portions 31a provided inside the central member 6a may be (spatially) connected to each other.

[0055] By applying the first feature, it is possible to efficiently arrange a plurality of heat insulating parts 31a in the central member 6a of the die 6. This makes it possible to increase the total area of ​​the heat insulating layer 31 that occupies the central member 6a of the die 6 in a plan view, thereby enhancing the heat insulating effect of the heat insulating layer 31. As a result, it is possible to appropriately suppress or prevent clogging of each nozzle 24.

[0056] In addition, by applying the first feature, the multiple heat insulating parts 31a can be arranged evenly and uniformly in the central member 6a, which reduces the variation in the ambient temperature of each nozzle 24, and as a result, reduces the variation in the degree of clogging in each nozzle 24. Therefore, pellets 14 having a uniform size can be manufactured.

[0057] This makes it possible to improve the performance of the die 6 and the performance of the extrusion device 1 including the die 6. Furthermore, it makes it possible to improve the quality of the pellets 14 produced using the extrusion device.

[0058] Furthermore, in central member 6a of die 6, casting hole 25 is located between the surface of central member 6a on the casting surface 21a side and multiple heat insulating portions 31a. Moreover, in a plan view, casting hole 25 preferably overlaps at least a portion of multiple heat insulating portions 31a. This allows the cooling effect from water tank 11 to be blocked by multiple heat insulating portions 31a, and the temperature of the resin material in casting hole 25 can be maintained at an appropriate temperature. This allows the viscosity of the resin material in casting hole 25 to be made appropriate (low viscosity), thereby suppressing or preventing clogging of each nozzle 24.

[0059] Furthermore, in the central member 6a of the die 6, the heat source 26 is located between the surface of the central member 6a on the injection surface 21a side and the multiple heat insulating parts 31a. This allows the region of the central member 6a of the die 6 that is closer to the injection surface 21a than the multiple heat insulating parts 31a to be accurately heated by the heat source 26. Therefore, in the region of the central member 6a of the die 6 that is closer to the injection surface 21a than the multiple heat insulating parts 31a, the viscosity of the resin material can be made appropriate (low), thereby suppressing or preventing clogging of each nozzle 24.

[0060] Further, in the central member 6a of the die 6, the nozzles 24 pass between the insulating parts 31a. From another perspective, in the central member 6a of the die 6, the insulating parts 31a are arranged to avoid the nozzles 24 so as not to overlap with the nozzles 24. As a result, in the region inside the nozzle 24 closer to the injection surface 21a than the insulating parts 31a, the insulating layer 31 blocks the cooling effect from the water tank 11, and the temperature of the resin material in the nozzle 24 can be maintained at an appropriate temperature. Therefore, in the region closer to the injection surface 21a than the insulating parts 31a, the viscosity of the resin material in the nozzle 24 can be made appropriate (low viscosity), thereby suppressing or preventing clogging of each nozzle 24.

[0061] Incidentally, when the pellets 14 are manufactured using the extrusion device 1, a load is generated on the die 6 from the extrusion surface 21b side toward the injection surface 21a side. That is, a load is generated in the direction of the arrows YG shown in FIG. 7 and FIG. 8. This is because the resin material (molten resin) extruded from the nozzle 24 of the die 6 of the extrusion device 1 is cut by the cutter attached to the cutter holder 12 to manufacture the pellets 14, and at that time, the cutter is rotated while being pressed against the extrusion surface 21b of the die 6. Therefore, a load is generated on the die 6 due to the press of the cutter against the extrusion surface 21b side of the die 6, and therefore a load is generated on the die 6 from the extrusion surface 21b side toward the injection surface 21a side.

[0062] However, when the first feature is adopted, the heat insulating effect of the heat insulating part 31a can be efficiently obtained, but there is a concern that the mechanical strength of the central member 6a is reduced due to the provision of the heat insulating part 31a, and the central member 6a may be deformed when a load is applied to the die 6 from the extrusion surface 21b side toward the injection surface 21a side. This is because the heat insulating layer 31, and therefore the heat insulating part 31a included in the heat insulating layer 31, is composed of holes (cavities) provided in the central member 6a, more specifically, the holes (cavities) provided in the central member 6a and the gas present inside the holes (cavities). An increase in the total area of ​​the heat insulating part 31a in the central member 6a of the die 6 in a plan view leads to a decrease in the mechanical strength of the central member 6a. If the central member 6a is deformed due to a decrease in mechanical strength, there is a risk of a decrease in the quality of the pellets 14 produced using the extrusion device.

[0063] Therefore, in this embodiment, in order to suppress or prevent a decrease in the mechanical strength of the central member 6a due to the provision of the heat insulating sections 31a, the cross-sectional shape of the heat insulating sections 31a provided in the central member 6a is devised. That is, as a second feature of this embodiment, the cross-sectional shape of each of the multiple heat insulating sections 31a provided in the central member 6a is shaped so that the interval S1 (see FIG. 8) between adjacent heat insulating sections 31a gradually increases from the extrusion surface 21b side toward the injection surface 21a side. In this case, the interval S1 between adjacent heat insulating sections 31a is larger at a position closer to the injection surface 21a than at a position closer to the extrusion surface 21b (i.e., S1a <S1b)。

[0064] From another perspective, the second feature can also be expressed as follows. That is, the cross-sectional shape of each of the multiple heat insulating parts 31a provided in the central member 6a is such that the width W1 (see FIG. 8) of the heat insulating part 31a gradually decreases from the extrusion surface 21b side toward the injection surface 21a side. In this case, the width W1 of the heat insulating part 31a is smaller at the position closer to the injection surface 21a than the width W1a at the position closer to the extrusion surface 21b (i.e., W1a>W1b). If the width W1 of the heat insulating part 31a gradually decreases from the extrusion surface 21b side toward the injection surface 21a side, the interval S1 between adjacent heat insulating parts 31a gradually increases from the extrusion surface 21b side toward the injection surface 21a side.

[0065] Here, the interval S1 between adjacent heat insulating portions 31a corresponds to the interval (distance) in the direction substantially perpendicular to the extension direction of the heat insulating portions 31a. The width W1 of the heat insulating portions 31a corresponds to the width (dimension) in the direction substantially perpendicular to the extension direction of the heat insulating portions 31a. The direction substantially perpendicular to the extension direction of the heat insulating portions 31a is substantially parallel to the thickness direction of the central member 6a. The thickness direction of the central member 6a corresponds to the direction substantially perpendicular to the extrusion surface 21b or the injection surface 21a, and the Z direction shown in Figures 2 to 4, 6, and 7 is the thickness direction of the central member 6a, and therefore the thickness direction of the die 6.

[0066] The interval S1 between adjacent heat insulating parts 31a corresponds to the width of the metal region between adjacent heat insulating parts 31a. Therefore, the second feature of the interval S1 between adjacent heat insulating parts 31a gradually increasing from the extrusion surface 21b side toward the injection surface 21a side means that the width of the metal region between adjacent heat insulating parts 31a gradually increases from the extrusion surface 21b side toward the injection surface 21a side. This structure (wherein the width of the metal region between adjacent heat insulating parts 31a gradually increases from the extrusion surface 21b side toward the injection surface 21a side) is suitable for alleviating (dispersing) the concentration of force in the metal region between adjacent heat insulating parts 31a and suppressing the occurrence of local stress when a load is generated from the extrusion surface 21b side toward the injection surface 21a side in the die 6.

[0067] In this embodiment, by applying the second feature, it is possible to suppress or prevent a decrease in mechanical strength of the central member 6a due to the provision of the heat insulating portion 31a, and it is possible to suppress or prevent deformation of the central member 6a when a load is generated in the die 6 from the extrusion surface 21b side toward the injection surface 21a side. Therefore, it is possible to improve the performance of the die 6 and the performance of the extrusion device 1 including the die 6. In addition, it is possible to improve the quality of the pellets 14 manufactured using the extrusion device 1.

[0068] An example of the dimensions of the heat insulating portion 31a is as follows, but is not limited thereto and can be changed as appropriate. The thickness T1 (see FIG. 8) of each heat insulating portion 31a is, for example, about 3 to 7 mm. The width W1 of each heat insulating portion 31a is, for example, about 5 to 10 mm at its widest point (i.e., the position on the side closer to the extrusion surface 21b). The closest distance S2 between adjacent heat insulating portions 31a (corresponding to the interval S1 between the closest points) is preferably about 0.2 to 5 mm, and more preferably about 1 mm. If the closest distance S2 between adjacent heat insulating portions 31a is made too small, the strength of the central member 6a will be reduced, and if the closest distance S2 between adjacent heat insulating portions 31a is made too large, the heat insulating effect will be reduced.

[0069] In addition, the cross-sectional shape of the insulating portion 31a is such that the width W1 of the insulating portion 31a gradually decreases from the extrusion surface 21b side toward the injection surface 21a side, and can be, for example, a semicircular or semi-elliptical shape with the injection surface 21a side being the arc side (convex side), as shown in Figure 8.

[0070] The arrangement of the multiple heat insulating sections 31a provided in the central member 6a will be described more specifically as follows: That is, the multiple heat insulating sections 31a provided in the central member 6a include multiple heat insulating sections 31a belonging to group G1 (first group), multiple heat insulating sections 31a belonging to group G2 (second group), multiple heat insulating sections 31a belonging to group G3 (third group), and multiple heat insulating sections 31a belonging to group G4 (fourth group) (see FIG. 6).

[0071] The heat insulating parts 31a of the group G1 extend in the X direction and are arranged in the Y direction in a plan view. The heat insulating parts 31a of the group G2 extend in the Y direction and are arranged in the X direction in a plan view. The heat insulating parts 31a of the group G3 extend in the X direction and are arranged in the Y direction in a plan view, and are located on the opposite side of the group G1 with the connecting hole 22 in between. The heat insulating parts 31a of the group G4 extend in the Y direction and are arranged in the X direction in a plan view, and are located on the opposite side of the group G2 with the connecting hole 22 in between. Here, the X direction and the Y direction are shown in Figs. 2 to 4, 6, and 7. The X direction and the Y direction are substantially parallel to the extrusion surface 21b or the injection surface 21a, and the X direction and the Y direction are perpendicular to each other. The Z direction is perpendicular to the X direction and the Y direction, that is, the thickness direction of the central member 6a.

[0072] By arranging the multiple heat insulating portions 31a provided on the central member 6a in this manner, the multiple heat insulating portions 31a can be arranged in the central member 6a of the die 6 more efficiently.

[0073] In this embodiment, in order to further suppress or prevent a decrease in the mechanical strength of the central member 6a due to the provision of the heat insulating portions 31a, the arrangement of the multiple heat insulating portions 31a provided in the central member 6a is also devised.

[0074] That is, as the third feature of the present embodiment, in each of the groups G1, G2, G3, and G4, the arrangement of the plurality of heat insulating portions 31a in a cross-sectional view (a cross-sectional view substantially perpendicular to the extending direction of the heat insulating portion 31a) is a curved (arch-shaped, bow-shaped) arrangement in which the substantially central portion of the arrangement protrudes toward the pressing surface 21b side (see FIG. 7). In other words, in each of the groups G1, G2, G3, and G4, the distance L1 (see FIG. 7) from the surface of the central member 6a on the pressing surface 21b side to each of the plurality of heat insulating portions 31a gradually increases as going from the center to both sides of the arrangement of the plurality of heat insulating portions 31a. In this case, the distance L1 from the surface of the central member 6a on the pressing surface 21b side to the heat insulating portion 31a is greater for the distance L1b at a position closer to both sides of the arrangement of the heat insulating portions 31a than for the distance L1a at a position closer to the center of the arrangement of the heat insulating portions 31a (that is, L1a < L1b). Such an arrangement of the plurality of heat insulating portions 31a is suitable for relieving (dispersing) the concentration of force and suppressing the generation of local stress when a load is generated from the pressing surface 21b side toward the injection surface 21a side in the die 6.

[0075] Note that FIG. 7 shows a cross-section cutting across the plurality of heat insulating portions 31a of the group G4, which corresponds to a cross-section perpendicular to the Z direction and substantially perpendicular to the extending direction of the plurality of heat insulating portions 31a of the group G4 (here, the Y direction). Cross-sections cutting across the plurality of heat insulating portions 31a of the group G1, cross-sections cutting across the plurality of heat insulating portions 31a of the group G2, and cross-sections cutting across the plurality of heat insulating portions 31a of the group G3 are also substantially the same as FIG. 7. Further, since FIG. 7 is a schematic diagram showing the arrangement of the heat insulating portions 31a, descriptions of portions other than the heat insulating portions (31a) may be omitted in some cases.

[0076] In this embodiment, by applying the third feature, it is possible to suppress or prevent a decrease in mechanical strength of the central member 6a due to the provision of the heat insulating portion 31a, and it is possible to suppress or prevent deformation of the central member 6a when a load is generated in the die 6 from the extrusion surface 21b side toward the injection surface 21a side. Therefore, it is possible to improve the performance of the die 6 and the performance of the extrusion device 1 including the die 6. In addition, it is possible to improve the quality of the pellets 14 manufactured using the extrusion device 1.

[0077] The heat insulating layer 31 further includes a plurality of heat insulating parts 31b extending in the thickness direction (Z direction) of the central member 6a inside the central member 6a. Like the heat insulating parts 31a, the heat insulating parts 31b are also composed of holes (cavities) provided in the central member 6a and gas present inside the holes (cavities). The heat insulating parts 31b provided inside the central member 6a are connected to the inner ends (ends closer to the connecting holes 22) of the plurality of heat insulating parts 31a, respectively. Specifically, the inner ends of the plurality of heat insulating parts 31a are connected (connected) to the ends (ends closer to the extrusion surface 21b) of the plurality of heat insulating parts 31b, respectively. Therefore, each heat insulating part 31b extends from the end connected to the heat insulating part 31a toward the injection surface 21a along the thickness direction (Z direction) of the central member 6a. The heat insulating parts 31b may be connected by an annular heat insulating part or the like.

[0078] Since the heat insulating layer 31 has not only the heat insulating portion 31a but also the heat insulating portion 31b, it is possible to enhance the heat insulating effect of the heat insulating layer 31. Also, since the heat insulating portion 31a and the heat insulating portion 31b are connected (spatially connected), it becomes easy to reduce the pressure inside the heat insulating portions 31a and 31b to a pressure lower than atmospheric pressure or to make it a vacuum.

[0079] In addition, the holes constituting the insulating portion 31b may reach the surface of the central member 6a on the injection surface 21a side, but in that case, it is preferable that the holes constituting the insulating portion 31b are blocked (closed) on the surface of the central member 6a on the injection surface 21a side.

[0080] The heat insulating layer 31 further includes a heat insulating portion 31c to which the outer peripheral end of each heat insulating portion 31a is connected. That is, of both ends of the heat insulating portion 31a, the inner end, which is the end closer to the center (connecting hole 22) of the die 6, is connected (connected) to the heat insulating portion 31b, and the outer peripheral end, which is the end farther from the center (connecting hole 22) of the die 6 (in other words, the side closer to the outer periphery of the die 6), is connected (connected) to the heat insulating portion 31c. Therefore, the heat insulating portion 31a, the heat insulating portion 31b connected to the inner end of the heat insulating portion 31a, and the heat insulating portion 31c connected to the outer peripheral end of the heat insulating portion 31a are spatially connected. The heat insulating portion 31c surrounds the multiple heat insulating portions 31a in a plan view. In the die 6, one or more heat insulating portions 31c are provided. In the die 6, the heat insulating portion 31c may be provided in the central member 6a, may be provided in the outer peripheral member 6b, or may be provided between the side surface of the central member 6a and the outer peripheral member 6b. The heat insulating portion 31c extends along the thickness direction (Z direction) of the die 6 from the end connected to the heat insulating portion 31a toward the casting surface 21a.

[0081] Since the heat insulating layer 31 has not only the heat insulating portion 31a but also the heat insulating portion 31c, it is possible to enhance the heat insulating effect of the heat insulating layer 31. Also, since the heat insulating portion 31a, the heat insulating portion 31b, and the heat insulating portion 31c are connected (spatially connected), it becomes easy to reduce the pressure inside the heat insulating portions 31a, 31b, and 31c to a pressure lower than atmospheric pressure or to a vacuum.

[0082] Furthermore, by surrounding injection hole 25 and heat source 26 with heat insulating portions 31a, 31b, 31c, the cooling effect from water tank 11 is blocked by heat insulating portions 31a, 31b, 31c, and the temperature of the resin material in injection hole 25 can be easily controlled to an appropriate temperature by heat source 26. This makes it easier to control the viscosity of the resin material in injection hole 25 to an appropriate viscosity (low viscosity), thereby more accurately suppressing or preventing clogging in each nozzle 24.

[0083] In addition, since the central member 6a is subjected to a load from the cutter as described above, it is preferable to use a metal material with high strength. However, metal materials tend to have low toughness and become easily cracked when they are strong. In addition, the central member 6a is heated to a high temperature by the heat source 26, so a certain degree of thermal expansion occurs. Therefore, in this embodiment, the toughness of the outer peripheral member 6b is preferably made higher than that of the central member 6a. That is, it is preferable that the toughness of the metal material constituting the outer peripheral member 6b is higher than that of the metal material constituting the central member 6a. As a result, even if a metal material with relatively low toughness is selected as the metal material for the central member 6a by prioritizing strength, by constituting the outer peripheral member 6b with a metal material with high toughness, it is easy to prevent damage to the die 6. In addition, even if the central member 6a thermally expands due to heating by the heat source 26, the expansion can be absorbed by the high toughness of the outer peripheral member 6b, so that it is easy to prevent damage to the die 6. Regarding toughness, a material can be judged to have high toughness if it has a large elongation in a tensile test or a large impact value in an impact test.

[0084] <About the manufacturing method of Die 6> The central member 6a of the die 6 in this embodiment can be manufactured by various methods, but is particularly suitable for manufacturing by a 3D printer. Examples of manufacturing methods using a 3D printer include powder bed fusion lamination, in which powder made of a metal material is laid out in layers and the powder is directly sintered by a high-power laser beam or electron beam, or a powder fixing lamination method in which a binder is added to the powder by an inkjet method and the powder is solidified, and a fused deposition model method in which a metal is ejected from a nozzle and melted to laminate.

[0085] Immediately after the central member 6a is manufactured, the heat insulating layer 31, the heat source 26, and the heat sensor 27 are simply holes (spaces) formed inside the central member 6a. However, to facilitate understanding of the explanation, the following explanation will be given assuming that these holes are the above-mentioned components.

[0086] Before or after manufacturing the central member 6a using a 3D printer, the peripheral member 6b and the hard plate 6c are prepared. The peripheral member 6b and the hard plate 6c are manufactured separately from the central member 6a, but may also be manufactured using a 3D printer.

[0087] After the central member 6a, the outer peripheral member 6b and the hard plate 6c are prepared, the central member 6a and the outer peripheral member 6b are joined together as described above, and the central member 6a is surrounded by the outer peripheral member 6b.

[0088] Moreover, the central member 6a and the hard plate 6c are connected (joined) to each other, and the hard plate 6c is provided on the surface of the central member 6a on the extrusion surface 21b side.

[0089] In this manner, the die 6 in this embodiment is manufactured.

[0090] By manufacturing the central member 6a by a 3D printer, the insulating layer 31 (insulating portions 31a, 31b) that is hollow inside the central member 6a can be easily formed. In addition, since the central member 6a including the insulating layer 31 is integrally molded, the strength of the entire central member 6a can be increased.

[0091] In particular, when the central member 6a is manufactured by a 3D printer, the central member 6a having the above-mentioned multiple heat insulating portions 31a can be manufactured easily and accurately.

[0092] The invention made by the inventor has been specifically described above based on the embodiment thereof. However, it goes without saying that the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention.

[0093] For example, the central member 6a may be formed not only from a single member, but also from multiple members. The peripheral member 6b may be formed not only from a single member, but also from multiple members. The central member 6a and the peripheral member 6b may be formed not only as separate members, but also as a combination of the central member 6a and the peripheral member 6b formed as an integrated member. [Explanation of symbols]

[0094] 1. Extrusion equipment 2 Cylinder 3 Screw 4 Rotational drive mechanism 5 Hopper 6 Dice 6a Central member 6b Peripheral member 6c Hard Plate 11. Aquarium 12 Cutter holder 13 Pelletizer 14 pellets 21a Injection surface 21b Extrusion surface 22,23 Connection hole 22a, 23a Connecting member 24 Nozzles 25 Injection hole 26 Heat source 27 Thermal Sensor 31 Thermal insulation layer 31a, 31b, 31c Insulation section L1 distance S1 interval W1 width

Claims

1. A die having an extrusion surface and an injection surface opposite the extrusion surface, the die including: a first member made of a first metallic material; an injection hole formed from the surface of the first member on the injection surface side to the inside of the first member; a plurality of nozzles formed from the surface of the first member on the extrusion surface side to the inside of the first member and connected to the injection hole; a heat source disposed within the first member; and A plurality of first heat insulating sections provided inside the first member; Here, the plurality of first heat insulating portions extend from an outer circumferential side of the first member toward an inner side of the first member in a plan view, The multiple first heat insulating portions have a cross-sectional shape such that the distance between adjacent first heat insulating portions gradually increases from the extrusion surface side toward the injection surface side.

2. A die having an extrusion surface and an injection surface opposite the extrusion surface, comprising: a first member made of a first metallic material; an injection hole formed from the surface of the first member on the injection surface side to the inside of the first member; a plurality of nozzles formed from the surface of the first member on the extrusion surface side to the inside of the first member and connected to the injection hole; a heat source disposed within the first member; and A plurality of first heat insulating sections provided inside the first member; Here, the plurality of first heat insulating portions extend from an outer circumferential side of the first member toward an inner side of the first member in a plan view, The plurality of first heat insulating portions have a cross-sectional shape whose width gradually decreases from the extrusion surface side toward the injection surface side.

3. A die having an extrusion surface and an injection surface opposite the extrusion surface, comprising: a first member made of a first metallic material; an injection hole formed from the surface of the first member on the injection surface side to the inside of the first member; a plurality of nozzles formed from the surface of the first member on the extrusion surface side to the inside of the first member and connected to the injection hole; a heat source disposed within the first member; and A plurality of first heat insulating sections provided inside the first member; Here, the plurality of first heat insulating portions extend from an outer circumferential side of the first member toward an inner side of the first member in a plan view, A first connecting hole is provided in a central portion of the first member so as to penetrate the first member, The plurality of first heat insulating sections include the plurality of first heat insulating sections belonging to a first group, the plurality of first heat insulating sections belonging to a second group, the plurality of first heat insulating sections belonging to a third group, and the plurality of first heat insulating sections belonging to a fourth group, The first heat insulating portions belonging to the first group extend in a first direction in a plan view and are arranged in a second direction perpendicular to the first direction, The first heat insulating portions belonging to the second group extend in the second direction in a plan view and are arranged in the first direction, The plurality of first heat insulating portions belonging to the third group extend in the first direction, are arranged in the second direction, and are located on the opposite side to the first group across the first connecting hole, in a plan view. The plurality of first heat insulating portions belonging to the fourth group extend in the second direction in a plan view, are arranged in the first direction, and are located on the opposite side to the second group with the first connecting hole interposed therebetween, In each of the first group, the second group, the third group and the fourth group, the arrangement of the multiple first insulation sections in a cross-sectional view perpendicular to the extension direction of the multiple first insulation sections is a curved arrangement that is convex toward the extrusion surface side.

4. A die having an extrusion surface and an injection surface opposite the extrusion surface, comprising: a first member made of a first metallic material; an injection hole formed from the surface of the first member on the injection surface side to the inside of the first member; a plurality of nozzles formed from the surface of the first member on the extrusion surface side to the inside of the first member and connected to the injection hole; a heat source disposed within the first member; and A plurality of first heat insulating sections provided inside the first member; Here, the plurality of first heat insulating portions extend from an outer circumferential side of the first member toward an inner side of the first member in a plan view, The first member further includes a plurality of second heat insulating portions provided inside the first member, The second heat insulating sections are respectively connected to inner ends of the first heat insulating sections and extend in a thickness direction of the first member.

5. In the die according to any one of claims 1 to 4, The plurality of first insulating portions extend radially.

6. In the die according to any one of claims 1 to 4, A die, wherein each of the plurality of first insulation sections comprises a hole provided in the first member and gas present inside the hole.

7. 7. The die according to claim 6, The pressure of the gas present within the cavity is atmospheric pressure or a reduced pressure or vacuum which is a pressure less than atmospheric pressure.

8. In the die according to any one of claims 1 to 4, The plate member is provided on a surface of the first member on the extrusion surface side and has a hardness higher than that of the first metal material, The nozzle extends through the plate member.

9. In the die according to any one of claims 1 to 4, The die further comprises a second member made of a second metallic material and joined to the first member so as to surround the first member in the plan view.

10. 10. The die of claim 9, A third heat insulating portion is provided between the first member and the second member, A die, wherein the outer peripheral ends of the multiple first insulation sections are connected to the third insulation section.

11. 10. The die of claim 9, A die, wherein the toughness of the second metallic material is greater than the toughness of the first metallic material.

12. In the die according to any one of claims 1 to 4, The injection hole is located between the surface of the first member on the injection surface side and the plurality of first insulation portions.

13. 13. The die of claim 12, The plurality of nozzles pass between the plurality of first insulation portions.

14. In the die according to any one of claims 1 to 4, The heat source is located between the surface of the first member on the injection surface side and the plurality of first insulating portions.

15. An extrusion apparatus comprising the die according to any one of claims 1 to 4, A cylinder having a screw provided therein; the die, the cylinder connected to the pouring surface; a cutter holder having a plurality of cutters provided to face the extrusion surface of the die; The extrusion device comprises:

16. A method for producing pellets using the extrusion apparatus according to claim 15, (a) supplying a resin material into the inside of the cylinder; (b) injecting the resin material kneaded in the cylinder from the injection surface side into the injection hole of the die; (c) pushing out the resin material injected into the injection hole through the plurality of nozzles; (d) cutting the resin material extruded from the nozzle with the cutter to obtain a plurality of pellets made of the resin material; having The method for producing pellets, wherein the steps (c) and (d) are performed in a state in which the heat source is driven.

17. A method for manufacturing a die, comprising the steps of: (a) preparing a first component manufactured using a three-dimensional printer, the first component having an extrusion surface and an injection surface opposite the extrusion surface, and made of a first metallic material; (b) providing a second member made of a second metallic material; (c) providing a plate member having a hardness greater than that of the first metallic material; (d) joining a second member to the first member so as to surround the first member in a plan view seen from the extrusion surface side; and (e) joining the plate member to the surface of the first member on the extrusion surface side; Here, the first member is an injection hole formed from the surface of the first member on the injection surface side to the inside of the first member; a plurality of nozzles formed from the surface of the first member on the extrusion surface side to the inside of the first member and connected to the injection hole; A heat source provided inside the first member; A plurality of first heat insulating portions provided inside the first member; having The plurality of first heat insulating portions extend from an outer circumferential side of the first member toward an inner side of the first member in a plan view, The multiple first heat insulating portions have a cross-sectional shape such that the distance between adjacent first heat insulating portions gradually increases from the extrusion surface side toward the injection surface side.

18. A die having an extrusion surface and an injection surface opposite the extrusion surface, the die including: an injection hole formed from the injection surface to the interior of the die; a plurality of nozzles formed from the extrusion surface to the interior of the die and connected to the injection hole; a heat source disposed within the die; and A plurality of first insulation parts provided inside the die; Here, the plurality of first heat insulating portions extend from a central portion of the die toward an outer periphery thereof in a plan view, The multiple first heat insulating portions have a cross-sectional shape such that the distance between adjacent first heat insulating portions gradually increases from the extrusion surface side toward the injection surface side.

19. A die having an extrusion surface and an injection surface opposite the extrusion surface, comprising: an injection hole formed from the injection surface to the interior of the die; a plurality of nozzles formed from the extrusion surface to the interior of the die and connected to the injection hole; a heat source disposed within the die; and A plurality of first insulation parts provided inside the die; Here, the plurality of first heat insulating portions extend from a central portion of the die toward an outer periphery thereof in a plan view, The plurality of first heat insulating portions have a cross-sectional shape whose width gradually decreases from the extrusion surface side toward the injection surface side.

20. A die having an extrusion surface and an injection surface opposite the extrusion surface, comprising: an injection hole formed from the injection surface to the interior of the die; a plurality of nozzles formed from the extrusion surface to the interior of the die and connected to the injection hole; a heat source disposed within the die; and A plurality of first insulation parts provided inside the die; Here, the plurality of first heat insulating portions extend from a central portion of the die toward an outer periphery thereof in a plan view, A first connecting hole is provided in a center portion of the die so as to penetrate the die, The plurality of first heat insulating sections include the plurality of first heat insulating sections belonging to a first group, the plurality of first heat insulating sections belonging to a second group, the plurality of first heat insulating sections belonging to a third group, and the plurality of first heat insulating sections belonging to a fourth group, The first heat insulating portions belonging to the first group extend in a first direction in a plan view and are arranged in a second direction perpendicular to the first direction, The first heat insulating portions belonging to the second group extend in the second direction in a plan view and are arranged in the first direction, The plurality of first heat insulating portions belonging to the third group extend in the first direction, are arranged in the second direction, and are located on the opposite side to the first group across the first connecting hole, in a plan view. The plurality of first heat insulating portions belonging to the fourth group extend in the second direction in a plan view, are arranged in the first direction, and are located on the opposite side to the second group with the first connecting hole interposed therebetween, In each of the first group, the second group, the third group and the fourth group, the arrangement of the multiple first insulation sections in a cross-sectional view perpendicular to the extension direction of the multiple first insulation sections is a curved arrangement that is convex toward the extrusion surface side.

21. A die having an extrusion surface and an injection surface opposite the extrusion surface, comprising: an injection hole formed from the injection surface to the interior of the die; a plurality of nozzles formed from the extrusion surface to the interior of the die and connected to the injection hole; a heat source disposed within the die; and A plurality of first insulation parts provided inside the die; Here, the plurality of first heat insulating portions extend from a central portion of the die toward an outer periphery thereof in a plan view, Further comprising a plurality of second insulating portions provided inside the die, The second insulating portions are respectively connected to inner ends of the first insulating portions and extend in the thickness direction of the die.

22. A die having an extrusion surface and an injection surface opposite the extrusion surface, comprising: an injection hole formed from the injection surface to the interior of the die; a plurality of nozzles formed from the extrusion surface to the interior of the die and connected to the injection hole; a heat source disposed within the die; and A plurality of first insulation parts provided inside the die; Here, the plurality of first heat insulating portions extend from a central portion of the die toward an outer periphery thereof in a plan view, Further comprising a third insulating portion provided inside the die and extending in a thickness direction of the die, The outer peripheral end portions of the plurality of first heat insulating portions are connected to the third heat insulating portion.

23. In the die according to any one of claims 18 to 22, The plurality of first insulating portions extend radially.

24. In the die according to any one of claims 18 to 22, A die, wherein each of the multiple first insulation sections is composed of a hole provided in the die and gas present inside the hole.

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