Resin pellet air blowing device, air blowing method, and manufacturing method

Abstract

To provide a resin pellet air blowing device, an air blowing method, and a manufacturing method, which can reliably suppress generation of irregular shape material such as floss, snake skin, streamers and angel hairs in a transport pipe when air blowing resin pellets.SOLUTION: There is provided an air blowing device for blowing resin pellets, which is an air blowing device equipped with an air blowing pipe device having a structure in which a diameter of a cylindrical pipe is larger than a diameter of an introduction pipe, and at a bent pipe section of the resin pellet air blowing piping, an introduction pipe for supplying resin pellets and airflow is attached in a circumferential direction of the cylindrical pipe, and another end of the cylindrical pipe is an outlet for the resin pellets and airflow.SELECTED DRAWING: Figure 1A

Description

[Technical Field]

[0001] The present invention relates to a blower device and a blowing method for blowing resin pellets that have been discharged from an extruder and produced through cooling, cutting, and other processes, and a method for producing resin pellets using the same. More specifically, the present invention relates to a blower device, a blowing method, and a method for producing resin pellets that are capable of suppressing the generation of foreign matter due to irregular shapes (floss, snakeskin, streamers, etc.) in piping caused by blowing. [Background technology]

[0002] Resin pellets are typically produced by extruding a resin composition heated and melted in an extruder through a die attached to the extruder as fibrous strands, which are then cut into pellet-shaped products or intermediate products using a pelletizer. The resulting resin pellets are typically transported through an airflow conveying pipe and stored in a storage silo. They are then sent to a discharge silo for loading into packaging bags or containers at the time of shipment. Due to the simplicity of the equipment, medium- to low-pressure airflow conveying equipment with high airflow velocities is commonly used as a means of airflow conveying resin pellets. However, friction between the resin pellets and each other or with the inner wall of the pipe can cause the resin pellets to powder, or the resin pellets welded to the inner wall can peel off, resulting in the formation of irregularities known as floss, snakeskin, streamers, angel hair, and the like. These irregularities are particularly likely to occur in bent pipe sections of the airflow conveying pipe, or to adhere to and accumulate on the inner surface of the bent pipe. Furthermore, if these foreign objects remain in the product, they will degrade the quality of the product, so they must ultimately be removed. Usually, they are separated and reduced using auxiliary equipment such as cyclones to remove and separate foreign objects, but there is a problem that they cannot be completely removed.

[0003] As a means of solving this problem, a method of pneumatically transporting plastic granules is known in which 1 to 20% by weight of the transported amount of water is added to the transporting air or plastic granules to form a water film on the surface of the plastic granules, which can suppress the generation of irregularly shaped objects due to contact friction between pellets, chips, or with the inner wall of the transport pipe, and also reduce pressure loss (see, for example, Patent Document 1).

[0004] Also known are polyethylene resin pellet particles and a method for transporting polyethylene resin pellet particles through an airflow, which can suppress the amount of irregularly shaped objects generated during airflow transport by making the flatness of the polyethylene resin pellet particles and the polyethylene resin pellets transported by entraining the polyethylene resin pellet particles in a flowing airflow greater than 1.5 (see, for example, Patent Document 2).

[0005] Also known is a method for producing resin pellets that do not produce irregularities due to the formation of snakeskin or the like by melting and extruding resin using an extruder and cutting the resulting resin pellets under specific conditions to make the average weight per pellet of the resin within a specific range (see, for example, Patent Document 3).

[0006] Patent Document 4 describes an airflow mixing device that includes an inlet pipe that supplies an airflow containing powdered or granular material and a cylindrical pipe that is an outlet for the airflow containing powdered or granular material, in which the inlet pipe is attached in the tangential direction to the circumference of the cylindrical pipe that has a larger diameter than the inlet pipe. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 10-147433 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-239752 [Patent Document 3] Japanese Patent Application Laid-Open No. 2004-268505 [Patent Document 4] Japanese Patent Application Laid-Open No. 2008-238074 Summary of the Invention [Problem to be solved by the invention]

[0008] However, in Patent Document 1, adding moisture during airflow can cause pellets to stick to the inside of the piping, potentially reducing airflow efficiency. Also, if the moisture content of the product is high, processing problems such as foaming of the molten resin can occur when users perform injection molding or other processes, and this can lead to a deterioration in physical properties.

[0009] Furthermore, in Patent Document 2, when the flatness increases, the strength of the resin strands discharged from the extruder decreases, which reduces the productivity of pellets produced by extrusion, and there are problems in that the resin pellets may be powdered due to the impact of collisions between the resin pellets or with the inner wall of the transport pipe when the resin pellets are transported by air.

[0010] In addition, in Patent Document 3, the cutting length of the resin pellets is adjusted to keep the average weight per pellet within a specific range. However, adjusting the resin pellets to be short results in small particles like powder, which are difficult to handle when users perform injection molding and can cause contamination inside the injection molding airflow line and other processes. Adjusting the resin pellets to be long can result in the pellets being rejected as defective in the sieving equipment used to separate irregularly shaped objects after cutting the resin strands, reducing production efficiency. Furthermore, long resin pellets can cause unstable weighing during injection molding by users, leading to molding defects.

[0011] The airflow mixer described in Patent Document 4 is a device for mixing plastic materials and the like, and is not intended for air-transporting resin pellets.

[0012] An object of the present invention is to provide a resin pellet blowing device, blowing method, and manufacturing method that can reliably suppress the generation of irregularities such as floss, snakeskin, streamers, and angel hairs in a transport pipe when transporting resin pellets by air current. [Means for solving the problem]

[0013] In order to solve the above problems, the present invention has the following configuration. (1) A blower device for blowing resin pellets, comprising a cylindrical tube with one end closed, an inlet tube for supplying resin pellets and airflow, and an airflow pipe device attached circumferentially to the cylindrical tube at a curved pipe section of the pellet blower pipe, the other end of which is an outlet for the resin pellets and airflow, and the diameter of the cylindrical tube being larger than the diameter of the inlet tube. (2) The air blower according to (1), wherein the angle α between the center line of the introduction pipe and the center line of the cylindrical pipe is in the range of 60° to 120°. (3) The air blower according to (1) or (2), wherein the introduction pipe and / or the cylindrical pipe are installed substantially horizontally. (4) The air blower according to any one of (1) to (3), wherein the diameter of the cylindrical tube is in the range of 1.5D1 to 5D1, where D1 is the diameter of the introduction tube. (5) The air blower according to any one of (1) to (4), wherein the cylindrical tube has a tapered portion for connecting to an outlet having a diameter smaller than the diameter of the cylindrical tube. (6) The air blower according to (5), wherein the angle β of the tapered portion is in the range of 20° to 80° with respect to the axial direction of the cylindrical tube. (7) The air blower according to any one of (1) to (6), wherein the length of the straight pipe portion of the cylindrical pipe is in the range of 1.5D1 to 5D1, where D1 is the diameter of the introduction pipe. (8) The air blower according to any one of (1) to (7), wherein the inner surface of the cylindrical tube is knurled. (9) A method for blowing resin pellets using the blower according to any one of (1) to (8). (10) The method for blowing the resin pellets according to (9), wherein the gas blowing the resin pellets is air or an inert gas. (11) The blowing method according to (9) or (10), wherein the temperature of the blown resin pellets is in the range of 80 to 120°C. (12) The air blowing method according to any one of (9) to (11), wherein the air velocity of the gas passing through the introduction pipe is in the range of 20 to 30 m / sec. (13) A method for producing resin pellets, comprising the air blowing method according to any one of (9) to (12).

[0014] The method for producing resin pellets of the present invention is characterized by using the above-mentioned air blowing device for resin pellets.

[0015] In a preferred embodiment of the air blowing device for resin pellets, the resin pellets are thermoplastic resin pellets and fatty acid metal salts.

[0016] The number of air duct devices to be installed in the present invention may be one or more, but it is preferable to install a plurality of them at the curved pipe portion of the air duct.Furthermore, it is preferable to install the air duct device in the present invention horizontally. [Effects of the Invention]

[0017] According to the present invention, as an air-transport device for air-transporting resin pellets, an air-transport device is provided in the bent pipe section of the pellet air-transport piping, i.e., instead of the conventionally used bent pipe, in which an inlet pipe for supplying resin pellets and airflow is attached circumferentially to a cylindrical pipe with one closed end, and the other end of the cylindrical pipe is an outlet for the resin pellets and airflow, and the diameter of the cylindrical pipe is larger than the diameter of the inlet pipe.This makes it possible to reliably suppress the occurrence of irregular objects such as floss, snakeskin, streamers, angel hair, etc. in the transport piping, especially in the bent pipe section where they were most likely to occur, and makes it possible to produce resin pellets with significantly reduced mixing of these irregular objects. [Brief explanation of the drawings]

[0018] [Figure 1A] 1 is a schematic diagram of a resin pellet manufacturing apparatus equipped with a blower arrangement according to one embodiment of the present invention; [Figure 1B]1B is a schematic plan view of the resin pellet manufacturing apparatus of FIG. 1A. [Figure 2A] FIG. 10 is a schematic diagram of a resin pellet manufacturing apparatus equipped with a blower arrangement according to another embodiment of the present invention. [Figure 2B] FIG. 2B is a schematic plan view of the resin pellet manufacturing apparatus of FIG. 2A. [Figure 3A] FIG. 10 is a schematic diagram of a resin pellet manufacturing apparatus equipped with a blower arrangement according to yet another embodiment of the present invention. [Figure 3B] FIG. 3B is a schematic plan view of the resin pellet manufacturing apparatus of FIG. 3A. [Figure 4A] FIG. 10 is a schematic diagram of a resin pellet manufacturing apparatus equipped with a blower arrangement according to yet another embodiment of the present invention. [Figure 4B] FIG. 4B is a schematic plan view of the resin pellet manufacturing apparatus of FIG. 4A. [Figure 5A] 1 is a schematic cross-sectional view showing an example of an arrangement of introduction pipes in a wind pipe device according to the present invention. [Figure 5B] FIG. 10 is a schematic cross-sectional view showing another example of the arrangement of the inlet pipes of the air delivery pipe device according to the present invention. [Figure 6A] 1 is a schematic cross-sectional view showing an example of an arrangement of each part of a wind pipe device according to the present invention. [Figure 6B] 4 is a schematic cross-sectional view showing another example of the arrangement of the components of the air delivery tube device according to the present invention. FIG. [Figure 6C] FIG. 10 is a schematic cross-sectional view showing yet another example of the arrangement of the components of the air delivery tube device according to the present invention. [Figure 7] 10 is a schematic cross-sectional view showing a modified example of the cylindrical tube of the air sending tube device of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, the present invention will be described in detail with reference to the drawings together with embodiments thereof. The present invention relates to a blower, a blowing method, and a resin pellet manufacturing method using the same, which suppress the generation of irregular-shaped particles when blowing resin pellets in a resin pellet manufacturing process. First, the blower, a blowing tube device constituting a main part of the blower, and a resin pellet manufacturing apparatus using the blower according to the present invention will be described with reference to the drawings.

[0020] Figures 1 to 4 (Figures 1A, 1B, 2A, 2B, 3A, 3B, 4A, and 4B) show a schematic configuration illustrating the general equipment system of a resin pellet manufacturing apparatus. In Figures 1 to 4, 1 indicates a pelletizer, 2 indicates a wind-transport device, 3 indicates a silo, and 4 indicates a wind-transport device, respectively. Also, Figures 5 and 6 (Figures 5A, 5B, 6A, 6B, and 6C) are schematic cross-sectional views of wind-transport device 2, in which 5 indicates an inlet pipe, 6 indicates a cylindrical pipe, 7 indicates a tapered portion of cylindrical pipe 6, 8 indicates a discharge pipe, and 9 indicates the traveling direction of the resin pellets, respectively.

[0021] In the resin pellet manufacturing device in the illustrated example, resin pellets are blown from the pelletizer 1 to the silo 3, and in this blowing device 4, an inlet pipe 5 for supplying resin pellets and airflow is attached circumferentially to a cylindrical pipe 6 with one end closed at the curved pipe section of the pellet blowing piping 10 from the pelletizer 1 to the silo 3, and the other end of the cylindrical pipe 6 is an outlet (discharge pipe 8) for the resin pellets and airflow, and a blowing pipe device 2 is provided having a structure in which the diameter of the cylindrical pipe 6 is larger than the diameter of the inlet pipe 5.

[0022] Fig. 1A is a side view of the resin pellet manufacturing apparatus, in which the air transport pipe device 2 is installed at a location where the pellet air transport pipe 10 changes direction from horizontal to vertical with respect to the ground (a location where a bent pipe was previously provided, hereinafter simply referred to as the "bent pipe section"). Fig. 1B is a top view of the resin pellet manufacturing apparatus of Fig. 1A, in which the air transport pipe device 2 is installed at a bent pipe section where the pellet air transport pipe 10 changes direction from horizontal to vertical with respect to the ground.

[0023] Fig. 2A is a side view of the resin pellet manufacturing apparatus, in which the air transport pipe device 2 is installed at a bent pipe section where the pellet air transport pipe 10 changes direction from vertical to horizontal with respect to the ground. Fig. 2B is a top view of the resin pellet manufacturing apparatus of Fig. 2A, in which the air transport pipe device 2 is installed at a bent pipe section where the pellet air transport pipe 10 changes direction from vertical to horizontal with respect to the ground.

[0024] 3A is a side view of the resin pellet manufacturing apparatus, in which the air transport pipe device 2 is installed at a bent pipe section where the pellet air transport pipe 10 changes direction from horizontal to the depth direction of the figure. FIG. 3B is a top view of the resin pellet manufacturing apparatus of FIG. 3A, in which the air transport pipe device 2 is installed at a bent pipe section where the pellet air transport pipe 10 changes direction from horizontal to the depth direction of the figure.

[0025] 4A is a side view of the resin pellet manufacturing apparatus, in which the air transport pipe device 2 is installed at a bent pipe section where the pellet air transport pipe 10 changes direction from horizontal to the depth of the figure, at a bent pipe section where the pellet air transport pipe 10 changes direction from horizontal to vertical with respect to the ground, and at a bent pipe section where the pellet air transport pipe 10 changes direction from vertical to horizontal with respect to the ground. Fig. 4B is a top view of the resin pellet manufacturing apparatus of Fig. 4A, in which the air transport pipe device 2 is installed at a bent pipe section where the pellet air transport pipe 10 changes direction from horizontal to the depth of the figure, at a bent pipe section where the pellet air transport pipe 10 changes direction from horizontal to vertical with respect to the ground, and at a bent pipe section where the pellet air transport pipe 10 changes direction from vertical to horizontal with respect to the ground.

[0026] 5 shows an example of the positional relationship between a portion of the inlet pipe 5 and the cylindrical pipe 6, and is a schematic cross-sectional view of the air delivery pipe device 2 as viewed perpendicular to the axial direction of the cylindrical pipe 6. In particular, FIG. 5A shows the inlet pipe 5 attached circumferentially to the left of the cylindrical pipe 6, and the airflow sent through the inlet pipe 5 is introduced into the cylindrical pipe 6 in a clockwise direction in the figure. FIG. 5B shows the inlet pipe 5 attached circumferentially to the right of the cylindrical pipe 6, and the airflow sent through the inlet pipe 5 is introduced into the cylindrical pipe 6 in a counterclockwise direction in the figure.

[0027] Figure 6 shows an example of the mounting relationship between a portion of the inlet pipe 5, the cylindrical pipe 6, the tapered portion 7, and a portion of the outlet pipe 8, and is a schematic cross-sectional view of the air delivery pipe device 2 in a direction parallel to the axial direction of the cylindrical pipe 6. In particular, when the angle between the center line of the inlet pipe 5 and the center line of the cylindrical pipe 6 is α, Figure 6A shows the case where α = 90°, Figure 6B shows the case where α = 60°, and Figure 6C shows the case where α = 120°. β indicates the angle of the tapered portion 7 with respect to the axial direction of the cylindrical pipe 6.

[0028] 7 shows an example of the mounting relationship between a portion of the inlet pipe 5, the cylindrical pipe 6, the tapered portion 7, and a portion of the outlet pipe 8, and is a schematic cross-sectional view of the air transport pipe device 2 in a direction parallel to the axial direction of the cylindrical pipe 6. This is a diagram of a portion of the inlet pipe, the cylindrical pipe, the tapered portion, and a portion of the outlet pipe, horizontal to the axial direction of the cylindrical pipe. In particular, FIG. 7 shows an example of an embodiment in which the tapered portion 7 extends over substantially the entire axial length of the cylindrical pipe 6.

[0029] In the present invention, resin pellets are cut by pelletizer 1, and then an airflow containing the resin pellets is transported through inlet pipe 5 of air-transporting tube device 2. The airflow is introduced into cylindrical tube 6 from the tangential direction of the cylindrical tube and swirls along the inner wall of cylindrical tube 6. The airflow inside cylindrical tube 6 passes through tapered portion 7 of cylindrical tube 6 and is discharged from discharge pipe 8.

[0030] The embodiment of the present invention shown in FIG. 1 will be described below. The airflow generating device in the present invention may be any device that satisfies the predetermined flow rate and pressure, such as a blower or a compressor. Any type of airflow may be used, such as dehumidified air or an inert gas such as nitrogen gas.

[0031] The flow velocity of the airflow is preferably 20 to 30 m / sec. If the flow velocity is faster than 30 m / sec, irregular shapes are likely to be generated due to contact friction between the resin pellets and with the inner wall of the airflow pipe, and the resin pellets are likely to be powdered by the impact. If the flow velocity is slower than 20 m / sec, the resin pellets cannot be properly air-transported, and the resin pellets may become stuck in the pipe, making production impossible.

[0032] The diameter of the inlet pipe 5 in the present invention can be selected depending on the specific gravity and diameter of the resin pellets, the processing amount, etc. The material of the inlet pipe 5 may be any material such as metal or plastic, but hardened stainless steel is preferred to prevent wear with the resin pellets and to prevent rust and the like from being mixed into the resin pellets.

[0033] In the present invention, the diameter of the cylindrical tube 6 is preferably in the range of 1.5D1 to 5D1 relative to the diameter D1 of the introduction tube 5, because if it is too small, the airflow containing the resin pellets will not swirl inside the cylindrical tube, and if it is too large, the flow rate of the airflow inside the cylindrical tube will decrease, the resin pellets will not be transported, and there is a risk of them becoming stagnant and eventually becoming blocked.

[0034] Furthermore, the installation position of the inlet pipe 5 in the circumferential direction of the cylindrical pipe 6 is preferably close to the sealed side of one end of the cylindrical pipe 6, and it is preferable to install it at a position where the distance from the inner wall of the inlet pipe 5 on the sealed side of the cylindrical pipe 6 is 0D1 to approximately 0.5D1, relative to the diameter D1 of the inlet pipe.

[0035] Furthermore, if the length of the cylindrical tube 6 is too short, the swirling time of the airflow containing the resin pellets will be shortened, reducing the froth reduction effect, and if it is too long, there is a risk that the resin pellets will not be transported due to energy loss caused by swirling, etc., as they head towards the discharge outlet (discharge tube 8).Therefore, it is preferable that the length from the inner wall of the inlet tube 5 on the discharge outlet side of the cylindrical tube 6 to the tapered portion 7 (in this invention, referred to as the length of the straight pipe portion of the cylindrical tube 6) be in the range of 1.5D1 to 5D1 relative to the diameter D1 of the inlet tube 5.

[0036] Furthermore, in order to suppress the generation of floss, it is preferable to perform knurling (also called knurling) on the inner surface of the cylindrical tube 6. Knurling (also called knurling) is a process for creating fine irregularities on a metal surface, and it is preferable to perform a process in which linear or mesh-like cuts are made with a pitch of about 1.0 mm to 2.5 mm and a depth of about 50 μm to 250 μm.

[0037] By knurling the inner surface of the cylindrical tube 6 to create fine irregularities, the contact area between the blown resin pellets and the inner surface of the cylindrical tube 6 is reduced, which makes it possible to prevent the resin pellets from fusing together on the inner surface of the cylindrical tube 6. This is thought to further reduce froth.

[0038] In the present invention, the diameter of the discharge side of the tapered portion 7 installed on the discharge outlet side of the cylindrical tube 6 is preferably the same diameter as the diameter D2 of the discharge pipe 8. If the diameter (inner diameter) D2 of the discharge pipe 8 is too small, the resin pellets will not be discharged sufficiently from the discharge pipe 8 and will remain inside the cylindrical tube 6. If the diameter D2 of the discharge pipe 8 is too large, the air flow rate will decrease, the resin pellets will not be transported, and they may remain and eventually become blocked. Therefore, it is preferable that the diameter D2 of the discharge pipe 8 be in the range of 1D1≦D2≦1.2D1 relative to the diameter D1 of the inlet pipe 5.

[0039] The angle β of the tapered portion 7 provided on the discharge port side of the cylindrical pipe 6 is preferably in the range of 20° to 80° in order to smoothly transport the airflow containing the resin pellets to the discharge pipe 8.

[0040] As with the introduction pipe 5, the cylindrical pipe 6 and tapered portion 7 may be made of any material, such as metal or plastic, but hardened stainless steel is preferred to prevent wear with the resin pellets and to prevent rust and the like from being mixed into the resin pellets. The cylindrical pipe 6 is not limited to a cylindrical shape having a straight cylindrical portion and a tapered portion, but may have a substantially hollow truncated cone shape, as shown in Figure 7, by making the tapered portion 7 of the cylindrical pipe 6 as long as possible (so that the tapered portion 7 extends over substantially the entire length of the cylindrical pipe 6).

[0041] The present invention can be applied to both thermoplastic resin and thermosetting resin pellets. Note that the term "resin pellets" as used herein is a concept that includes not only pellets of a predetermined shape but also powder-like pellets.

[0042] Thermoplastic resins that can be used in the air blower of the present invention include polyester resins such as polyphenylene sulfide resin, polyamide resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polybutylene naphthalene dicarboxylate resin, polyethylene naphthalene dicarboxylate resin, and polypropylene terephthalate resin, liquid crystalline polyester resin, polycarbonate resin, ABS resin (acrylonitrile / butadiene / styrene copolymer), AS resin (acrylonitrile / styrene copolymer), hydrogenated or unhydrogenated SBS resin (styrene / butadiene / styrene triblock copolymer), and Examples of suitable thermoplastic resins include styrene / isoprene / styrene triblock copolymers), hydrogenated or unhydrogenated SIS resins (styrene / isoprene / styrene triblock copolymers), SEBS resins (hydrogenated styrene / butadiene / styrene triblock copolymers), polyethylene resins, polypropylene resins, polymethylpentene resins, cyclic olefin resins, cellulose resins such as cellulose acetate, polyacetal resins, polysulfone resins, polyether ether ketone resins, polyimide resins, and polyetherimide resins. However, it is preferable to use one or more thermoplastic resins selected from polyphenylene sulfide resins, polyamide resins, and polyester resins. The resin does not necessarily have to be a single type, and two or more types may be used in combination. Among polyester resins, polybutylene terephthalate resins are preferred.

[0043] Examples of additives contained in the thermoplastic resin include fibrous or non-fibrous fillers (inorganic fillers and organic fillers) in the form of plates, scales, particles, irregular shapes, crushed pieces, and the like. Specifically, glass fiber, milled glass fiber, irregular cross-section glass fiber, cut glass fiber, stainless steel fiber, metal fibers such as aluminum fiber and brass fiber, organic fibers such as aromatic polyamide fiber and Kevlar (registered trademark) fibrils, gypsum fiber, ceramic fiber, asbestos fiber, zirconia fiber, alumina fiber, silica fiber, titanium oxide fiber, silicon carbide fiber, E glass (plate-shaped, scale-shaped, granular, irregular shape, crushed), H glass (plate-shaped, scale-shaped, granular, irregular shape, crushed), A glass (plate-shaped, scale-shaped, granular, irregular shape, crushed), C glass (plate-shaped, scale-shaped, granular, irregular shape, crushed), natural quartz glass (plate-shaped, scale-shaped, granular, irregular shape, crushed), synthetic quartz glass (plate-shaped, scale-shaped, granular, irregular shape, crushed), rock wool, alumina hydrate (whisker, plate-shaped), carbon titanate Examples of metal oxides include sodium whiskers, barium titanate whiskers, aluminum borate whiskers, silicon nitride whiskers, talc, kaolin, silica (crushed and spherical), quartz, calcium carbonate, zinc carbonate, mica, glass beads, glass microballoons, clay, molybdenum disulfide, wollastonite, aluminum oxide (crushed), translucent alumina (fibrous, plate-like, flake-like, granular, irregularly shaped, and crushed), titanium oxide (crushed), and zinc oxide (fibrous, plate-like, flake-like, granular, irregularly shaped, and crushed), metal hydroxides such as aluminum hydroxide (fibrous, plate-like, flake-like, granular, irregularly shaped, and crushed), aluminum nitride, translucent aluminum nitride (fibrous, plate-like, flake-like, granular, irregularly shaped, and crushed), calcium polyphosphate, graphite, metal powder, metal flake, and metal ribbon.

[0044] Other additional components can also be added to the thermoplastic resin composition described above. The additional components may be fed from the main hopper, from a side feeder, or in separate feeds from the main hopper and side feeder. Examples of additional components include release agents, phosphorus-based antioxidants, antioxidants, UV absorbers, light stabilizers, flame retardants, anti-dripping agents, colorants, fluorescent brighteners, phosphorescent pigments, fluorescent dyes, flow modifiers, inorganic and organic antibacterial agents, photocatalytic antifouling agents, infrared absorbers, and photochromic agents. Additional components can be added within a range that does not impair the effects of the present invention.

[0045] Examples of thermosetting resins that can be used in the air blower of the present invention include phenolic resin, melamine resin, polyester resin, silicone resin, epoxy resin, and urethane resin. Examples of elastomers include polyolefin rubber, fluorine rubber, and silicone rubber.

[0046] Examples of additives contained in the thermosetting resin include non-fibrous fillers (inorganic fillers and organic fillers) in the form of fibers or plates, scales, particles, irregular shapes, crushed products, and the like. Specifically, glass fiber, milled glass fiber, irregular cross-section glass fiber, cut glass fiber, stainless steel fiber, metal fibers such as aluminum fiber and brass fiber, organic fibers such as aromatic polyamide fiber and Kevlar (registered trademark) fibrils, gypsum fiber, ceramic fiber, asbestos fiber, zirconia fiber, alumina fiber, silica fiber, titanium oxide fiber, silicon carbide fiber, E glass (plate-shaped, scale-shaped, granular, irregular shape, crushed), H glass (plate-shaped, scale-shaped, granular, irregular shape, crushed), A glass (plate-shaped, scale-shaped, granular, irregular shape, crushed), C glass (plate-shaped, scale-shaped, granular, irregular shape, crushed), natural quartz glass (plate-shaped, scale-shaped, granular, irregular shape, crushed), synthetic quartz glass (plate-shaped, scale-shaped, granular, irregular shape, crushed), rock wool, alumina hydrate (whisker, plate-shaped), carbon titanate Examples of metal oxides include sodium whiskers, barium titanate whiskers, aluminum borate whiskers, silicon nitride whiskers, talc, kaolin, silica (crushed and spherical), quartz, calcium carbonate, zinc carbonate, mica, glass beads, glass microballoons, clay, molybdenum disulfide, wollastonite, aluminum oxide (crushed), translucent alumina (fibrous, plate-like, flake-like, granular, irregularly shaped, and crushed), titanium oxide (crushed), and zinc oxide (fibrous, plate-like, flake-like, granular, irregularly shaped, and crushed), metal hydroxides such as aluminum hydroxide (fibrous, plate-like, flake-like, granular, irregularly shaped, and crushed), aluminum nitride, translucent aluminum nitride (fibrous, plate-like, flake-like, granular, irregularly shaped, and crushed), calcium polyphosphate, graphite, metal powder, metal flake, and metal ribbon.

[0047] The resin pellets obtained using the manufacturing method of the present invention can be subjected to various molding processes such as injection molding, extrusion molding, blow molding, and transfer molding. Furthermore, they can be used for various applications through injection molding, extrusion molding, blow molding, and transfer molding. Examples of such applications include electrical and electronic components such as sensors, LED lamps, connectors, sockets, resistors, relay cases, switches, coil bobbins, capacitors, variable capacitor cases, oscillators, various terminal boards, transformers, plugs, printed circuit boards, tuners, speakers, microphones, headphones, small motors, magnetic head bases, semiconductors, liquid crystal displays, FDD carriages, FDD chassis, motor brush holders, parabolic antennas, and computer-related components; VTR components, television components, audio components, audio equipment components such as audio, laser discs (registered trademark), and compact discs; lighting components, refrigerator components, air conditioner components, irons, hair dryers, and the like. Home and office electrical appliance parts such as rice cooker parts, microwave oven parts, typewriter parts, and word processor parts; office computer parts, telephone parts, facsimile parts, copier parts, cleaning tools, motor parts, lighters, and typewriters; optical equipment and precision machinery parts such as microscopes, binoculars, cameras, and clocks; plumbing parts such as water faucet tops, mixer taps, mixing valves, pump parts, pipe joints, fittings (elbows, tee pipes, sockets, etc.), water flow control valves, pressure reducing valves, relief valves, solenoid valves, three-way valves, thermo valves, water temperature sensors, water volume sensors, bathtub adapters, and water meter housings;Valve alternator terminals, alternator connectors, IC regulators, potentiometer bases for light dimmers, various valves such as exhaust gas valves, various pipes for fuel, exhaust systems and intake systems, air intake nozzle snorkels, intake manifolds, fuel pumps, engine coolant joints, carburetor main bodies, carburetor spacers, exhaust gas sensors, coolant sensors, oil temperature sensors, throttle position sensors, crankshaft position sensors, air flow meters, brake pad wear sensors, thermostat bases for air conditioners, heating hot air flow control valves, radiator motors Examples of applications include motor brush holders, water pump impellers, turbine vanes, wiper motor related parts, distributors, starter switches, starter relays, transmission wire harnesses, windshield washer nozzles, air conditioner panel switch boards, fuel-related electromagnetic valve coils, fuse connectors, horn terminals, electrical component insulating plates, step motor rotors, lamp sockets, lamp reflectors, lamp housings, brake pistons, solenoid bobbins, engine oil filters, ignition device cases, vehicle speed sensors, and cable liners for automobile and vehicle related parts. [Example]

[0048] Next, the effects of the present invention will be specifically described with reference to examples. In this example, nylon resin pellets were blown. Furthermore, in this example, the amount of froth generated from the silo, which is the point where the blowing of the resin pellets ends, was confirmed. The present invention will be described in detail below using examples, but the present invention is not limited to the following examples. First, the apparatus and raw materials used in each example and comparative example, and the method for evaluating the amount of froth generated in each example and comparative example will be described.

[0049] [Nylon resin pellet characteristics] The nylon resin pellets used will be described below. Material: Nylon resin pellets (Toray Industries, Inc., "Amilan" (registered trademark) CM3004V0F) Particle size: φ3mm × 3.0mmL Specific gravity: 1190kg / m 3

[0050] [Conditions] The implementation conditions are described below. Nylon resin pellet processing capacity: 400 kg / h

[0051] [Inlet pipe 5, cylindrical pipe 6, tapered section 7, outlet pipe 8] The inlet pipe 5, cylindrical pipe 6, tapered portion 7, and outlet pipe 8 will be described. Inlet pipe 5 length: 5m Inlet pipe 5 nominal diameter: 50A Cylindrical tube 6 length: 150mm Cylindrical pipe 6 nominal diameter: 100A Angle between the center line of the inlet pipe and the center line of the cylindrical pipe: 90° Tapered section angle β: 60° Discharge pipe length: 10m Inlet pipe 5, cylindrical pipe 6, taper 7, outlet pipe 8 Material: SUS304 with Tufftride treatment on the inside It is more preferable that the cylindrical tube 6 has an inner surface knurled.

[0052] [Evaluation method] The evaluation method is described below. (1) The amount of contamination was calculated by dividing the weight of the froth obtained from the silo, where the air transport of the resin pellets ends, by the weight extracted from the silo.

[0053] [Example 1] to [Example 4] Using the air blowing device shown in FIG. 2, nylon resin pellets were blown and sampled under the above conditions and according to the following procedure. (1) An airflow is generated by an airflow generating device. (2) Nylon resin pellets cut by the pelletizer 1 are blown by an air current and flow into the inlet pipe 5 of the blower pipe device 2 shown in FIG. (3) The pellets are discharged from the discharge pipe 8 and transported to the silo 3, which is the point where the air transport of the resin pellets ends. (4) Collect 1 ton of resin pellets discharged from silo 3 and measure the weight of the froth contained therein.

[0054] [Comparative Example 1] Air was blown in the same manner as in Examples 1 to 4, except that the cylindrical pipe 6 and tapered portion 7 were not installed and the inlet pipe and outlet pipe were directly connected (a configuration equivalent to a conventional simple bent pipe). The results are shown in Table 1.

[0055] [Table 1]

[0056] The results in Table 1 show that, compared to Comparative Example 1, Examples 1 to 4 produced less floss. [Explanation of symbols]

[0057] 1 Pelletizer 2 Air pipe device 3. Silo 4 Air blower 5 Introductory tube 6 Cylindrical tube 7 Tapered section 8 Discharge pipe 9 Direction of resin pellet movement 10 Pellet air transport piping

Claims

1. This is a blower device for blowing resin pellets, and is provided with a blower tube device having a structure in which an inlet tube for supplying resin pellets and an air flow to a cylindrical tube with one end closed is attached circumferentially to the cylindrical tube at a bent pipe section of a pellet blower pipe, the other end of the cylindrical tube being an outlet for the resin pellets and the air flow, and the diameter of the cylindrical tube is larger than the diameter of the inlet tube.

2. 2. The air blower according to claim 1, wherein an angle α formed between a center line of the introduction pipe and a center line of the cylindrical pipe is in the range of 60° to 120°.

3. The air blowing device according to claim 1 , wherein the introduction pipe and / or the cylindrical pipe are disposed substantially horizontally.

4. 2. The air blower according to claim 1, wherein the diameter of the cylindrical pipe is in the range of 1.5D1 to 5D1, where D1 is the diameter of the introduction pipe.

5. 2. The air blowing device of claim 1, wherein the cylindrical tube has a tapered portion for connection to an outlet having a diameter smaller than that of the cylindrical tube.

6. 6. The air blower according to claim 5, wherein the angle β of the tapered portion is in the range of 20° to 80° with respect to the axial direction of the cylindrical tube.

7. 2. The air blower according to claim 1, wherein the length of the straight pipe portion of the cylindrical pipe is in the range of 1.5D1 to 5D1, where D1 is the diameter of the introduction pipe.

8. 2. The air blower according to claim 1, wherein the inner surface of the cylindrical tube is knurled.

9. A method for blowing resin pellets using the blower according to any one of claims 1 to 8.

10. The method for blowing the resin pellets according to claim 9, wherein the gas blowing the resin pellets is air or an inert gas.

11. The blowing method according to claim 9, wherein the temperature of the blown resin pellets is in the range of 80 to 120°C.

12. 10. The air blowing method according to claim 9, wherein the air velocity of the gas passing through the introduction pipe is in the range of 20 to 30 m / sec.

13. A method for producing resin pellets, comprising the air blowing method according to claim 9.

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