Mold for granulating device, cutting blade holder for granulating device, cutting blade unit for granulating device, resin cutting device, granulating device, and method for manufacturing resin granules

Abstract

The present application provides a mold for a granulating device, a cutting blade holder for a granulating device, a cutting blade unit for a granulating device, a resin cutting device, and a granulating device, which can suppress the increase in size even if the processing capacity is increased. The mold (10) includes a bottom surface (10B), an upper surface (10A) having a smaller radius than the bottom surface (10B), a side surface (10C) connecting an outermost peripheral portion of the bottom surface (10B) and an outermost peripheral portion of the upper surface (10A), and a plurality of mold holes (11) formed in the side surface (10C) and used for discharging a resin raw material.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a die for a pelletizing device, a cutting blade holder for a pelletizing device, a cutting blade unit for a pelletizing device, a resin cutting device, a pelletizing device, and a method for manufacturing resin pellets. BACKGROUND

[0002] A pelletizing device for manufacturing pellets from a resin raw material such as synthetic resin is disclosed in Japanese Patent Application Publication No. 2019-51617 (Patent Literature 1). In the above-described pelletizing device, a die surface in which die holes for discharging the resin raw material are formed and a blade surface of a cutting blade pressed against the die surface are disposed orthogonal to a rotation axis of a cutting blade unit.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Publication No. 2019-51617 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] In recent years, it is required to increase the processing capacity of a pelletizing device. Along with this, each component of the pelletizing device such as a die and a cutting blade unit, and the entire pelletizing device are being made larger.

[0008] A main object of the present disclosure is to provide a die for a pelletizing device, a cutting blade holder for a pelletizing device, a cutting blade unit for a pelletizing device, a resin cutting device, and a pelletizing device, which can suppress the increase in size even if the processing capacity is increased.

[0009] Another object of the present disclosure is to provide a method for manufacturing a large number of resin pellets using a die for a pelletizing device, a cutting blade holder for a pelletizing device, a cutting blade unit for a pelletizing device, a resin cutting device, and a pelletizing device, the increase in size of which is suppressed.

[0010] MEANS FOR SOLVING THE PROBLEMS

[0011] The die for a pelletizing device according to one embodiment of the present disclosure includes a bottom surface, an upper surface having a smaller radius than the bottom surface, a side surface connecting an outermost portion of the bottom surface and an outermost portion of the upper surface, and a die hole formed in the side surface for discharging a resin raw material.

[0012] A cutting edge holder for a pelletizer according to one embodiment of the present disclosure includes a rotatable cutter shaft connected to a shaft of a driving motor, and a rotatable cutting edge connection portion connected to the cutter shaft for connecting a plurality of cutting edges. The cutting edge connection portion has a shape of a circular truncated cone. An axis of rotation of the cutting edge connection portion is orthogonal to a bottom surface and an upper surface constituting the circular truncated cone. The plurality of cutting edges are connected to side surfaces constituting the circular truncated cone.

[0013] A cutting edge unit for a pelletizer according to one embodiment of the present disclosure includes a rotatable cutter shaft connected to a shaft of a driving motor, a rotatable cutting edge connection portion connected to the cutter shaft, and a plurality of cutting edges connected to the cutting edge connection portion. The cutting edge connection portion has a shape of a circular truncated cone. An axis of rotation of the cutting edge connection portion is orthogonal to a bottom surface and an upper surface constituting the circular truncated cone. The plurality of cutting edges are connected to side surfaces constituting the circular truncated cone.

[0014] A resin cutting device according to one embodiment of the present disclosure includes a mold for discharging a resin raw material, and a cutting edge unit for pelletizing the discharged resin raw material. The mold includes a bottom surface, an upper surface having a smaller radius than the bottom surface, a side surface connecting an outermost portion of the bottom surface and an outermost portion of the upper surface, and a mold hole formed in the side surface for discharging the resin raw material.

[0015] A pelletizer according to one embodiment of the present disclosure includes a mold for discharging a resin raw material, and a cutting edge unit for pelletizing the discharged resin raw material. The mold includes a bottom surface, an upper surface having a smaller radius than the bottom surface, a side surface connecting an outermost portion of the bottom surface and an outermost portion of the upper surface, and a mold hole formed in the side surface for discharging the resin raw material.

[0016] A method of manufacturing resin pellets according to one embodiment of the present disclosure includes a process (a) of discharging a resin raw material from a mold of a pelletizer, and a process (b) of pelletizing the discharged resin raw material after the process (a). The mold includes a bottom surface, an upper surface having a smaller radius than the bottom surface, a side surface connecting an outermost portion of the bottom surface and an outermost portion of the upper surface, and a mold hole formed in the side surface for discharging the resin raw material.

[0017] Effects of the Invention

[0018] The mold for a pelletizer, the cutting edge holder for a pelletizer, the cutting edge unit for a pelletizer, the resin cutting device, and the pelletizer according to one embodiment of the present disclosure can suppress a size increase even if a processing amount is increased in capacity.

[0019] The method of manufacturing resin pellets according to one embodiment of the present disclosure can manufacture a large amount of resin pellets using the pelletizer according to one embodiment of the present disclosure.BRIEF DESCRIPTION OF DRAWINGS BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a diagram showing a molding device of one embodiment.

[0021] Figure 2 is a partially enlarged side view showing a mold, a cutting blade holder, a cutting blade unit, and a resin cutting device of one embodiment.

[0022] Figure 3 is a partially enlarged plan view showing a mold, a cutting blade holder, a cutting blade unit, and a resin cutting device of one embodiment.

[0023] Figure 4 is a partially enlarged view of a cutting blade holder, a cutting blade unit, and a resin cutting device of one embodiment viewed from a mold side.

[0024] Figure 5 is a partially enlarged sectional view showing a mold, a cutting blade holder, a cutting blade unit, and a resin cutting device of one embodiment.

[0025] Figure 6 is a diagram for explaining a method of joining a mold and a cutting blade unit of one embodiment.

[0026] Figure 7 is a partially enlarged view showing a mold, a cutting blade holder, and a cutting blade unit of another embodiment.

[0027] Figure 8 is a partially enlarged view showing a mold, a cutting blade holder, and a cutting blade unit of another embodiment.

[0028] Figure 9 is a partially enlarged view showing a mold, a cutting blade holder, and a cutting blade unit of another embodiment.

[0029] Figure 10 is a partially enlarged side view showing a mold, a cutting blade holder, a cutting blade unit, and a resin cutting device of a comparative example. DETAILED DESCRIPTION

[0030] Hereinafter, one embodiment of the present disclosure will be described with reference to the drawings. Note that the same or equivalent portions in the following drawings are denoted by the same reference numerals, and description thereof will not be repeated.

[0031] <Configuration of Molding Device 100>

[0032] First, with reference to Figure 1 the configuration of a molding device of one embodiment will be described. Figure 1The illustrated granulating device 100 is a water-cut type granulating device. The granulating device 100 is connected with a feeder 110, an inflow pipe 111, and an outflow pipe 112. The granulating device 100 processes a resin raw material (hereinafter referred to as a raw material) supplied from the feeder 110 into a resin granule (hereinafter referred to as a granule) in a cooling liquid such as water supplied from the inflow pipe 111, and discharges the granule together with the cooling liquid to the outflow pipe 112.

[0033] As shown in Figure 1 The granulating device 100 mainly includes a hopper 1, a screw mixer 2, a flow divider 3, a gear pump 4, a screen changer 5, a die holder 6, a resin cutting device 30 in which a die 10 is connected to a cutting blade unit 20, a motor 40, and a chamber 50.

[0034] The feeder 110, the hopper 1, the screw mixer 2, the flow divider 3, the gear pump 4, the screen changer 5, the die holder 6, and the die 10 are connected in this order.

[0035] A certain amount of raw material is supplied from the feeder 110 to the hopper 1 per unit time. The hopper 1 supplies the raw material supplied from the feeder 110 to the screw mixer 2.

[0036] The screw mixer 2 melt-kneads the raw material supplied from the hopper 1. The screw mixer 2 supplies the melt-kneaded raw material to the flow divider 3.

[0037] The flow divider 3 switches so that the raw material melt-kneaded by the screw mixer 2 flows to the gear pump 4 or is discharged to the outside of the granulating device 100.

[0038] The flow divider 3 has an inflow port through which the raw material flows from the screw mixer 2, an outflow port connected to the gear pump 4, another outflow port connected to the outside of the granulating device 100, and a valve core. The valve core opens one of two flow paths connecting the inflow port and each outflow port formed in the flow divider 3 and closes the other flow path.

[0039] The gear pump 4 extrudes the raw material supplied from the flow divider 3 to the screen changer 5, the die holder 6, and the die 10 while pressurizing the raw material.

[0040] The screen changer 5 has a plurality of screens (not shown in the drawing) for removing impurities from the raw material supplied from the gear pump 4. The raw material passing through the screen changer 5 flows to the die 10 via the die holder 6. Note that the screen changer 5 has one or more screens disposed on a raw material flow path from the gear pump 4 to the die 10, one or more screens not disposed on the flow path, and a screen replacement mechanism that replaces the screens disposed on the flow path. The screen changer 5 performs screen replacement without stopping the granulating device 100 when one or more screens disposed on the flow path are clogged.

[0041] The mold 10 is detachably held by the mold seat 6. The mold 10 is, for example, threadedly fastened to the mold seat 6. The mold seat 6 is formed with a flow path for the raw material extruded from the screen changer 5 to flow.

[0042] The mold 10 is held by the mold seat 6. The mold 10 is formed with a flow path 7 (see Figure 5 ) for the raw material extruded from the above-mentioned flow path of the mold seat 6 and a plurality of mold holes 11 (see Figure 5 ) for discharging the raw material flowing in the flow path. The raw material extruded from the gear pump 4 to the mold 10 is discharged to the outside of the mold 10 through the flow path 7 and each of the mold holes 11, thereby being processed into an elongated cylindrical shape (hereinafter referred to as a strand).

[0043] The cutting blade unit 20 cuts the strand discharged from each of the mold holes 11 of the mold 10, thereby processing it into a pellet. As shown in Figure 2 , the cutting blade unit 20 includes a cutting blade 21 and a cutting blade holder 22, and rotates about the rotational axis O.

[0044] The mold 10 and the cutting blade unit 20 are housed inside the chamber 50. The chamber 50 is connected to the inflow pipe 111 and the outflow pipe 112. The chamber 50, the inflow pipe 111 and the outflow pipe 112 constitute a part of a circulation circuit of a cooling liquid. When the pelletizer 100 is operated, the inside of the chamber 50 is filled with the cooling liquid, and the pellet processed is cooled by the cooling liquid. The pellet is transported to a dewatering / drying device (not shown) together with the cooling liquid, and is dried by the dewatering / drying device.

[0045] The cutting blade unit 20 and the chamber 50 are mounted on the trolley 60, and are disposed so as to relatively move in the direction along the rotational axis O with respect to the mold 10.

[0046] <Configuration of the mold 10 and the cutting blade unit 20>

[0047] Next, the detailed configuration of the mold 10, the cutting blade unit 20 and the resin cutting device 30 will be described with reference to Figures 2 to 5

[0048] <Configuration of the mold 10>

[0049] As shown in Figure 2 , the mold 10 includes an upper surface 10A, a bottom surface 10B and a side surface 10C. The bottom surface 10B is connected to the mold seat 6. The bottom surface 10B is formed with a flow inlet for the raw material to flow into the above-mentioned flow path 7. The upper surface 10A is disposed apart from the bottom surface 10B in a direction perpendicular to the bottom surface 10B, toward the opposite side of the bottom surface 10B. The side surface 10C connects the outermost peripheral portion 10AO of the upper surface 10A and the outermost peripheral portion 10BO of the bottom surface 10B. The side surface 10C is formed with a plurality of mold holes 11.

[0050] ​like Figure 2 As shown, the central axis C of the mold 10, passing through the center of the upper surface 10A and the bottom surface 10B, is orthogonal to both the upper surface 10A and the bottom surface 10B. The upper surface 10A and the bottom surface 10B are concentric. When viewed from the side, the side surface 10C is inclined relative to the central axis C. It should be noted that viewing the mold 10 from the side means viewing the mold 10 radially relative to the central axis C.

[0051] like Figure 2 As shown, when viewed from the side, side 10C is inclined such that it separates from the central axis C as it moves from the upper surface 10A towards the bottom surface 10B. When viewed from the side, the angle between the upper surface 10A and side 10C is obtuse, and the angle between the bottom surface 10B and side 10C is acute. When viewed from the side, side 10C extends, for example, in a straight line.

[0052] like Figure 3 As shown, when viewed from above, the upper surface 10A and the bottom surface 10B are both circular. When viewed from above, the side surface 10C is annular. When viewed from above, the inner circumferential end 10EI and the outer circumferential end 10EO (details described later) of the side surface 10C are both circular. The upper surface 10A, the bottom surface 10B, and the side surface 10C of the mold 10 form a frustum shape. It should be noted that viewing the mold 10 from above refers to viewing the mold 10 from a direction perpendicular to the upper surface 10A. The radius of the upper surface 10A is smaller than the radius of the bottom surface 10B. When viewed from above, the outermost circumference 10AO of the upper surface 10A is positioned inside the outermost circumference 10BO of the bottom surface 10B.

[0053] like Figure 5 As shown, multiple mold holes 11 are formed on the side surface 10C. Figure 5 As shown, the hole axis of each mold hole 11 is orthogonal to the side surface 10C. The inner circumferential surface of each mold hole 11 is inclined relative to, for example, the hole axis of each mold hole 11. The inner circumferential surface of each mold hole 11 is inclined in such a way that the diameter of each mold hole 11 decreases as it approaches the side surface 10C.

[0054] The material forming the side surface 10C of the mold 10 has a higher hardness than the material forming the upper surface 10A of the mold 10. For example... Figure 5 As shown, the mold 10 includes, for example, a main body 10D constituting the upper surface 10A and the bottom surface 10B, and a curing layer 10E constituting the side surface 10C. The material constituting the curing layer 10E includes, for example, an ultra-hard alloy, such as TiC (titanium carbide).

[0055] like Figure 5As shown, the main body portion 10D has a side surface 10F that connects the outermost peripheral portion 10AO of the upper surface 10A and the outermost peripheral portion 10BO of the bottom surface 10B. The flow path 7 is formed inside the main body portion 10D. The cured layer 10E is formed on the side surface 10F of the main body portion 10D. The annular portion on the upper surface 10A side and the annular portion on the bottom surface 10B side in the side surface 10F are exposed from the cured layer 10E. The plurality of mold holes 11 are formed so as to penetrate the cured layer 10E and reach the flow path 7 formed inside the main body portion 10D from the side surface 10F of the main body portion 10D.

[0056] As shown in FIG. 1, the side surface 10C is formed on the side surface 10F of the main body portion 10D. The side surface 10C is formed so as to connect the outermost peripheral portion 10AO of the upper surface 10A and the outermost peripheral portion 10BO of the bottom surface 10B. Figure 5 As shown in FIG. 1, the side surface 10C is formed on the side surface 10F of the main body portion 10D. The side surface 10C is formed so as to connect the outermost peripheral portion 10AO of the upper surface 10A and the outermost peripheral portion 10BO of the bottom surface 10B.

[0057] As shown in FIG. 1, the side surface 10C is formed on the side surface 10F of the main body portion 10D. The side surface 10C is formed so as to connect the outermost peripheral portion 10AO of the upper surface 10A and the outermost peripheral portion 10BO of the bottom surface 10B. Figure 5 As shown in FIG. 1, the side surface 10C is formed on the side surface 10F of the main body portion 10D. The side surface 10C is formed so as to connect the outermost peripheral portion 10AO of the upper surface 10A and the outermost peripheral portion 10BO of the bottom surface 10B.

[0058] The inner peripheral end portion 10EI is connected to the outermost peripheral portion 10AO of the upper surface 10A by the annular portion on the upper surface 10A side in the side surface 10F of the main body portion 10D that is exposed from the cured layer 10E and the end surface of the cured layer 10E on the upper surface 10A side. The outer peripheral end portion 10EO is connected to the outermost peripheral portion 10BO of the bottom surface 10B by the annular portion on the bottom surface 10B side in the side surface 10F of the main body portion 10D that is exposed from the cured layer 10E and the end surface of the cured layer 10E on the bottom surface 10B side.

[0059] The side surface 10C is inclined in such a manner that the center axis C is separated as it approaches from the inner peripheral end portion 10EI toward the outer peripheral end portion 10EO.

[0060] Figure 5 The distance L2 in the radial direction with respect to the center axis C between the inner peripheral end portion 10EI and the outer peripheral end portion 10EO is shorter than the distance Ll in the radial direction with respect to the center axis C between the outermost peripheral portion 10AO of the upper surface 10A and the outermost peripheral portion 10BO of the bottom surface 10B. Figure 5 The distance L2 in the radial direction with respect to the center axis C between the inner peripheral end portion 10EI and the outer peripheral end portion 10EO is shorter than the distance Ll in the radial direction with respect to the center axis C between the outermost peripheral portion 10AO of the upper surface 10A and the outermost peripheral portion 10BO of the bottom surface 10B.

[0061] <Configuration of the cutting edge unit 20>

[0062] As shown in FIG. 1, the side surface 10C is formed on the side surface 10F of the main body portion 10D. The side surface 10C is formed so as to connect the outermost peripheral portion 10AO of the upper surface 10A and the outermost peripheral portion 10BO of the bottom surface 10B.Figures 2 to 4 As shown, the cutting blade unit 20 includes a plurality of (for example, four) cutting blades 21 and a cutting blade holder 22 for fixing each cutting blade 21. The rotation axis O of the cutting blade unit 20 is configured coaxially with the central axis C of the mold 10.

[0063] As shown, the cutting blade holder 22 includes a cutter shaft 23 connected to the shaft 41 of the driving motor 40 and a cutting blade connecting portion 24 connected to the cutter shaft 23 and for connecting the plurality of cutting blades 21. The cutter shaft 23 and the cutting blade connecting portion 24 are rotatable about the rotation axis O. Figure 2

[0064] The cutting blade connecting portion 24 has, for example, a shape of a circular truncated cone. The cutting blade connecting portion 24 includes an upper surface 24A, a bottom surface 24B, and a side surface 24C constituting the shape of the circular truncated cone. Each of the upper surface 24A and the bottom surface 24B has a circular shape. The radius of the upper surface 24A is smaller than the radius of the bottom surface 24B. The rotation axis O passes through the center of each of the upper surface 24A and the bottom surface 24B and is orthogonal to each of the upper surface 24A and the bottom surface 24B.

[0065] The upper surface 24A is disposed apart from the bottom surface 24B in a direction perpendicular to the bottom surface 24B toward the opposite side of the bottom surface 24B. The upper surface 24A is connected to the shaft 41 of the motor 40 via the cutter shaft 23. The bottom surface 24B is opposite to the upper surface 10A of the mold 10. The side surface 24C connects the outermost peripheral portion 24AO of the upper surface 24A and the outermost peripheral portion 24BO of the bottom surface 24B. The plurality of cutting blades 21 are fixed to the side surface 24C. Each cutting blade 21 is fixed to the side surface 24C of the cutting blade holder 22 by, for example, a screw 25. A screw hole 24D configured to be screwed by the screw 25 is formed in the side surface 24C. The screw hole 24D constitutes a fixing portion for fixing the cutting blade 21 to the side surface 24C.

[0066] As shown, the side surface 24C is inclined with respect to the rotation axis O when viewed in the side surface. Note that the side surface view of the cutting blade unit 20 means that the cutting blade unit 20 is viewed from the radial direction with respect to the rotation axis O. Figure 2 As shown, the side surface 24C is inclined in such a manner as to separate from the rotation axis O as the outermost peripheral portion 24AO is approached from the outermost peripheral portion 24BO when viewed in the side surface. In other words, the side surface 24C is inclined in such a manner as to separate from the rotation axis O as the outermost peripheral portion 24BO is approached from the outermost peripheral portion 24AO when viewed in the side surface.

[0067] Figure 2 As shown, the side surface 24C is inclined in such a manner as to separate from the rotation axis O as the outermost peripheral portion 24AO is approached from the outermost peripheral portion 24BO when viewed in the side surface. In other words, the side surface 24C is inclined in such a manner as to separate from the rotation axis O as the outermost peripheral portion 24BO is approached from the outermost peripheral portion 24AO when viewed in the side surface.

[0068] When viewed in the side surface, the angle between the upper surface 24A and the side surface 24C is an obtuse angle, and the angle between the bottom surface 24B and the side surface 24C is an acute angle. When viewed in the side surface, the side surface 24C extends, for example, in a straight line. ​​

[0069] As shown in Figure 2 and Figure 3 , the side surface 24C of the cutting edge holder 22 is in a similar relationship to the side surface 10C of the mold 10. The side surface 24C and the side surface 10C are each provided so as to constitute different portions of one conical surface centered on, for example, the central axis C and the rotation axis O. In a side surface view, the extending direction of the side surface 24C is along the extending direction of the side surface 10C.

[0070] As shown in Figure 3 and Figure 4 , each cutting edge 21 is disposed rotationally symmetrically with respect to the rotation axis O. Figure 3 and Figure 4 The four cutting edges 21 shown in

[0071] As shown in Figure 3 and Figure 4 , each cutting edge 21 has an inner side portion 21I fixed to the cutting edge connecting portion 24 of the cutting edge holder 22 and an outer side portion 21O protruding from the cutting edge connecting portion 24. The outer side portion 21O protrudes outward (mold 10 side) from the outermost peripheral portion 24BO of the bottom surface 24B in the direction along the rotation axis O. The outer side portion 21O protrudes outward from the outermost peripheral portion 24BO of the bottom surface 24B in the radial direction with respect to the rotation axis O.

[0072] As shown in Figure 3 and Figure 4 , in a plan view, the outer side portion 21O of each cutting edge 21 extends radially with respect to the rotation axis O. In the plan view, the outer shape of the outer side portion 21O of each cutting edge 21 has a long dimension direction A along the radial direction with respect to the rotation axis O and a short dimension direction along the circumferential direction with respect to the rotation axis O. Note that the plan view of the cutting edge unit 20 means that the cutting edge unit 20 is viewed from a direction perpendicular to the upper surface 24A.

[0073] As shown in Figure 5 , in a cross section along the rotation axis O, the outer side portion 21O of each cutting edge 21 extends along the side surface 10C. In the cross section along the rotation axis O, the outer side portion 21O extends in a straight line from the side surface 24C of the cutting edge connecting portion 24.

[0074] As shown in Figure 5As shown, the outer side portion 21O of each cutting edge 21 is provided to be in contact with the side surface 10C of the mold 10. The outer side portion 21O has, for example, a contact surface 21A provided to be in surface contact with the side surface 10C, and a rake surface 21B formed with a rake angle with respect to the contact surface 21A. The contact surface 21A of each cutting edge 21 extends along the longitudinal direction A of each cutting edge 21. The length of the longitudinal direction A of the contact surface 21A is equal to or greater than the above-mentioned along-surface distance Ll of the side surface 10C of the mold 10, for example. The projected area of each contact surface 21A when projected onto a plane orthogonal to the rotation axis O is smaller than the area of the contact surface 21A.

[0075] Note that the cutting edge unit 20 can include one or more cutting edges 21. In the case where the cutting edge unit 20 includes any number N of two or more cutting edges 21, the N cutting edges 21 are arranged rotationally symmetrically with respect to the rotation axis O at an angle of (360 / N) degrees.

[0076] <Configuration of the resin cutting device 30>

[0077] In the pelletizing device 100, the center axis C of the mold 10 and the rotation axis O of the cutting edge unit 20 are arranged coaxially, and the cutting edge 21 is pressed against the side surface 10C of the mold 10, thereby achieving Figure 2 and Figure 5 the state shown. Figure 2 and Figure 5 The state shown is a state in which the pelletizing device 100 can operate. In this specification, the state shown in Figure 2 and Figure 5 is referred to as a state in which the mold 10 and the cutting edge unit 20 are coupled, and the mold 10 and the cutting edge unit 20 in this coupled state are referred to as a resin cutting device 30. That is, the pelletizing device 100 is provided with the resin cutting device 30.

[0078] When viewed from the side, the outer side portion 21O of each cutting edge 21 extends along the side surface 10C of the mold 10. Note that side-viewing the resin cutting device 30 means viewing the resin cutting device 30 from the radial direction with respect to the center axis C and the rotation axis O.

[0079] In the resin cutting device 30, the above-mentioned contact surface 21A of each cutting edge 21 is pressed against and in contact with the side surface 10C of the mold 10. The resin cutting device 30 is provided such that the contact surface pressure applied between the side surface 10C of the mold 10 and the contact surface 21A of the cutting edge 21 is equal in the longitudinal direction A.

[0080] <Configuration of the chamber 50>

[0081] As shown in Figure 2As shown, the chamber 50 is configured to house the mold 10 and the cutting blade unit 20. The chamber 50 includes an inlet section 51 for coolant to flow into and an outlet section 52 for coolant and particles to flow out. The inlet section 51 is connected to an inlet pipe 111. The outlet section 52 is connected to an outlet pipe 112. The inlet section 51 is positioned below the outlet section 52. The inlet section 51 is positioned below the mold 10 and the cutting blade unit 20. The outlet section 52 is positioned above the mold 10 and the cutting blade unit 20. Thus, a flow path for coolant from bottom to top is formed within the chamber 50. A portion of the side surface 10C of the mold 10, located on the upper surface 10A side, is positioned, for example, vertically between the inlet section 51 and the outlet section 52.

[0082] like Figure 6 As shown, the chamber 50 is mounted on the trolley 60 together with the cutting blade unit 20, and is integrally configured to move relative to the mold 10. The chamber 50 has an opening 53. The opening area of ​​the opening 53 is larger than the projected area of ​​the mold 10 on a plane orthogonal to the central axis C and the projected area of ​​the cutting blade unit 20 on a plane orthogonal to the rotation axis O. Therefore, the chamber 50 does not interfere with the mold 10 during the aforementioned movement. The opening 53 is pressed against the mold base 6. The chamber 50 is watertightly connected to the mold base 6.

[0083] The chamber 50 has a through hole through which the cutting blade shaft 23 of the cutting blade unit 20 or the shaft 41 of the motor 40 is inserted.

[0084] <Methods for manufacturing granules>

[0085] Next, refer to Figure 5 This describes a method for manufacturing granules using the granulation apparatus 100.

[0086] First, raw materials are discharged from the die holes 11 of the granulation device 100. Next, the raw materials discharged from the die holes are granulated. Specifically, the raw materials supplied from the feeder 110 pass through the hopper 1, screw mixer 2, diverter valve 3, gear pump 4, screen changer 5, and die base 6 to the aforementioned flow path 7 of the die 10. Upon reaching the flow path 7 of the die 10, the raw materials are melted and mixed. The melted and mixed raw materials flow from the flow path 7 into each die hole 11, and are discharged from each die hole 11 onto the side surface 10C as wire. After being discharged from each die hole 11, the wire is immediately cut into particles by each cutting blade 21, which is pressed against the side surface 10C by the contact surface 21A and rotates around the rotation axis O. The particles are cooled by the coolant flowing within the chamber 50, and flow with the coolant, exiting from the outlet 52 to the outlet pipe 112.

[0087] The granules are then fed into a dehydration / drying unit (not shown) and dried thereby. In this way, granulation equipment 100 is used to manufacture granules from raw materials.

[0088] <Modification example>

[0089] Next, a modification example of the mold 10, the cutting edge unit 20, and the resin cutting apparatus 30 of the present embodiment will be described.

[0090] As shown in Figures 7 to 9 , the side surface 10C of the mold 10 and the contact surface 21A of the cutting edge 21 can each be curved when viewed in the side surface. The contact surface 21A of the cutting edge 21 is provided to be in contact with the side surface 10C of the mold 10.

[0091] As shown in Figure 7 , the curvature center of the side surface 10C of the mold 10 can be disposed on the inner side of the mold 10 as compared with the side surface 10C when viewed in the side surface. As shown in Figure 8 , the curvature center of the side surface 10C of the mold 10 can be disposed on the outer side of the mold 10 as compared with the side surface 10C when viewed in the side surface. In Figure 7 and Figure 8 , the curvature center of the contact surface 21A of the cutting edge 21 is provided to coincide with the curvature center of the side surface 10C.

[0092] As shown in Figure 9 , the side surface 24C of the cutting edge holder 22 can be curved when viewed in the side surface. The curvature center of the side surface 24C of the cutting edge holder 22 can be disposed on the inner side of the cutting edge holder 22 as compared with the side surface 24C when viewed in the side surface. The curvature center of the side surface 24C of the cutting edge holder 22 can be disposed on the outer side of the cutting edge holder 22 as compared with the side surface 24C when viewed in the side surface.

[0093] Such a mold 10, a cutting edge unit 20, and a resin cutting apparatus 30 also have substantially the same configuration as the mold 10, the cutting edge unit 20, and the resin cutting apparatus 30 shown in Figures 2 to 6 , and thus can exert the same effects.

[0094] <Effects>

[0095] Next, the effects of the mold 10, the cutting edge holder 22, the cutting edge unit 20, the resin cutting apparatus 30, and the pelletizing apparatus 100 of the present embodiment will be described based on comparison with a pelletizing apparatus of a comparative example (see Figure 10 ).

[0096] In Figure 10In the granulating device of the illustrated comparative example, the processing surface 210A of the die 210 in which the die hole is formed and the contact surface 241A of the cutting blade 221 which is pressed against the surface 210A to make contact are disposed orthogonal to the central axis C of the die and the rotation axis O of the cutting blade unit. Note that the die 210 includes a main body portion 210D and a solidified layer 210E formed on the surface of the main body portion 210D, and the processing surface 210A is the surface of the solidified layer 210E. In such a comparative example, if the processing surface 210A of the die 210 in which the die hole is formed and the contact surface 241A of the cutting blade 221 are increased in size in conjunction with the large capacity of the processing amount, the die 210 and the cutting blade 221 are upsized and become heavy. Further, in the granulating device of the comparative example, since the cutting blade holder 222 holds the plurality of cutting blades 221 while bearing the entire weight of these cutting blades, the cutting blade holder 222 is also upsized and becomes heavy. As a result, in the granulating device of the comparative example, it is difficult to suppress the upsizing of the device in conjunction with the large capacity of the processing amount.

[0097] In contrast to this, the die 10 of the granulating device 100 includes a bottom surface 10B, an upper surface 10A having a smaller radius than the bottom surface 10B, and a side surface 10C connecting the outermost peripheral portion 10BO of the bottom surface 10B and the outermost peripheral portion 10AO of the upper surface 10A, and a plurality of die holes 11 formed in the side surface 10C.

[0098] The cutting blade unit 20 of the granulating device 100 is provided with the cutting blade 21 and the cutting blade holder 22. The cutting blade holder 22 is provided with a bottom surface 24B, an upper surface 24A having a smaller maximum width than the bottom surface 24B, and a side surface 24C connecting the outermost peripheral portion 24BO of the bottom surface 24B and the outermost peripheral portion 24AO of the upper surface 24A when viewed from above. The cutting blade 21 has an inner side portion 21I fixed to the inner side portion of the side surface 24C, and an outer side portion 21O protruding from the outermost peripheral portion 24BO of the bottom surface 24B in a direction along the side surface 24C.

[0099] The resin cutting device 30 of the granulating device 100 is provided with the die 10 and the cutting blade unit 20. The rotation axis O of the cutting blade unit 20 is disposed coaxially with the central axis C of the die 10. When viewed from the side, the outer side portion 21O of the cutting blade 21 extends along the side surface 10C of the die 10.

[0100] Here, the granulating device 100 is compared with the granulating device of the comparative example, with the same processing amount. The area of the side surface 10C of the mold 10 of the granulating device 100 is equal to the area of the processing surface 210A in the granulating device of the comparative example. Also, the area of the contact surface 21A of each cutting blade 21 is equal to the area of the contact surface 241A of each cutting blade 221 in the granulating device of the comparative example. On the other hand, the projected area of the side surface 10C when the side surface 10C is projected onto a plane orthogonal to the central axis C is smaller than the area of the side surface 10C, and thus smaller than the area of the processing surface 210A of the comparative example. Likewise, the projected area of each contact surface 21A when the contact surface 21A is projected onto a plane orthogonal to the rotation axis O is smaller than the area of the contact surface 21A, and thus smaller than the area of the contact surface 211A of the comparative example. That is, in the above comparison, the mold 10 is downsized compared to the mold 210 of the comparative example, and the cutting blade unit 20 is downsized compared to the cutting blade unit 220 of the comparative example.

[0101] Thus, in the above comparison, the granulating device 100 can be downsized compared to the granulating device of the comparative example. Furthermore, as a result, the maintainability and operability of the granulating device 100 are improved compared to the granulating device of the comparative example.

[0102] Also, the mold 10 can be lightweight compared to the mold 210 of the comparative example. In other words, the ratio of the weight of the mold 10 divided by the area of the side surface 10C can be smaller than the ratio of the weight of the mold 210 of the comparative example divided by the area of the processing surface 210A.

[0103] Also, the mold 10 bears a part of the weight of the cutting blade 21 that moves above the side surface 10C of the mold 10, and thus the weight that the cutting blade holder 22 should bear is smaller than the total weight of the plurality of cutting blades. Thus, the cutting blade holder 22 can be downsized and / or lightweight compared to the cutting blade holder 222 of the comparative example.

[0104] Also, in the granulating device of the comparative example, since the cutting blade holder 222 bears the total weight of the plurality of cutting blades 221, the difference between the weight on the cutting blade 221 side and the weight on the shaft 241 side of the cutting blade unit 220 is large, the cutting blade 221 side relatively moves downward, the shaft 241 side relatively moves upward, and the cutting blade unit 220 can tilt with respect to the direction perpendicular to the processing surface 210A of the mold 210. That is, the rotation axis O of the cutting blade unit 220 can tilt with respect to the central axis C of the mold 210. In this case, each cutting blade 221 can not uniformly contact the processing surface of the mold.

[0105] On the other hand, in the pelletizer 100, since the weight that the cutting blade holder 22 should bear is smaller than the total weight of the plurality of cutting blades, the rotation axis O of the cutting blade unit 20 is less likely to incline with respect to the center axis C. As a result, each cutting blade 21 can make uniform contact with the side surface 10C of the die 10.

[0106] In addition, in the above comparison, the radius of the outermost peripheral portion of each cutting blade 21 is shorter than the radius of the outermost peripheral portion of each cutting blade 221 of the comparative example. Therefore, in the above comparison, in the case where the rotation speed is equal, the peripheral speed of each cutting blade 21 is lower than the peripheral speed of each cutting blade 221 of the comparative example. On the other hand, in the above comparison, in the case where the peripheral speed is equal, the rotation speed of each cutting blade 21 is increased compared with the rotation speed of each cutting blade 221 of the comparative example.

[0107] In the pelletizer 100 and the pelletizer of the comparative example, the peripheral speed of the cutting blade is limited from the viewpoint of preventing cavitation in the cooling liquid. According to the pelletizer 100, not only cavitation can be prevented to the same extent as the pelletizer of the comparative example, but also since the rotation speed of the cutting blade 21 is increased compared with the comparative example, more pellets can be processed using one cutting blade 21. As a result, in the pelletizer 100, the processing capacity of the pellets can be increased without increasing the number of cutting blades 21 compared with the comparative example. From a different perspective, in the pelletizer 100, the number of cutting blades 21 can be reduced without reducing the manufacturing efficiency of the pellets compared with the comparative example.

[0108] The configuration of the pelletizer 100 other than the die 10, the cutting blade unit 20, and the resin cutting device 30 can be the same as the configuration of the pelletizer of the comparative example other than the die 210 and the cutting blade unit 220. For example, the hopper 1, the screw mixer 2, the flow divider valve 3, the gear pump 4, and the screen changer 5 can have the same configuration as the above-described components of the pelletizer of the comparative example.

[0109] The pellet manufacturing method of the present embodiment uses the pelletizer 100 that is downsized and has improved maintainability and operability compared with the pelletizer of the comparative example, and thus can efficiently manufacture a large number of pellets compared with the pellet manufacturing method using the pelletizer of the comparative example.

[0110] The above describes the embodiments of the present disclosure, but various modifications can be made to the above-described embodiments. In addition, the scope of the present disclosure is not limited to the above-described embodiments.

[0111] Explanation of Reference Signs

[0112] 1 hopper, 2 screw mixer, 3 flow divider, 4 gear pump, 5 screen changer, 6 mold seat, 7 flow path, 10 mold, 10A upper surface, 10B bottom surface, 10C, 10F side surface, 10D main body portion, 10E cured layer, 10EI inner peripheral end portion, 10EO outer peripheral end portion, 11 mold hole, 20 cutting edge unit, 21 cutting edge, 21A contact surface, 21B front inclined surface, 21I inner side portion, 21O outer side portion, 22 cutting edge holder, 23 cutting knife shaft, 24 cutting edge connecting portion, 24A upper surface, 24AO outermost peripheral portion, 24B bottom surface, 24BO outermost peripheral portion, 24C side surface, 24D screw hole, 25 screw, 30 resin cutting device, 40 motor, 41 shaft, 50 chamber, 51 inflow portion, 52 outflow portion, 53 opening portion, 60 trolley, 100 pelletizer, 110 feeder, 111 inflow pipe, 112 outflow pipe.

Claims

1. A mold for a granulation device, characterized in that, Include: The bottom surface is circular when viewed from above; The upper surface is circular when viewed from above, concentric with the bottom surface, and has a radius smaller than that of the bottom surface; The side surface connects the outermost periphery of the bottom surface to the outermost periphery of the upper surface; as well as Multiple mold holes are formed on the side for discharging resin raw materials.

2. The mold for the granulation device according to claim 1, characterized in that, The bottom surface, the top surface, and the side surface form a frustum shape.

3. The mold for the granulation device according to claim 1, characterized in that, When viewed from the side, the side is curved.

4. The mold for the granulation apparatus according to any one of claims 1 to 3, characterized in that, The material constituting the side surface has a higher hardness than the material constituting the upper surface.

5. A resin cutting device, characterized in that, Include: Molds, which are used to discharge resin raw materials; and A cutting blade unit, used to granulate the discharged resin raw material. The mold has: The bottom surface is circular when viewed from above; The upper surface is circular when viewed from above, concentric with the bottom surface, and has a radius smaller than that of the bottom surface; The side surface connects the outermost periphery of the bottom surface to the outermost periphery of the upper surface; as well as Multiple mold holes are formed on the side for discharging the resin raw material.

6. A granulation apparatus, characterized in that, Include: Molds, which are used to discharge resin raw materials; and A cutting blade unit, used to granulate the discharged resin raw material. The mold has: The bottom surface is circular when viewed from above; The upper surface is circular when viewed from above, concentric with the bottom surface, and has a radius smaller than that of the bottom surface; The side surface connects the outermost periphery of the bottom surface to the outermost periphery of the upper surface; as well as Multiple mold holes are formed on the side for discharging the resin raw material.

7. The granulation apparatus according to claim 6, characterized in that, The bottom surface, the top surface, and the side surface form a frustum shape.

8. The granulation apparatus according to claim 6, characterized in that, It further includes a chamber for housing the mold and the cutting blade unit. The chamber contains: Inlet section, which supplies liquid inflow; and The outlet is for the liquid and particles granulated by the cutting blade unit to flow out.

9. The granulation apparatus according to claim 7, characterized in that, It further includes a chamber for housing the mold and the cutting blade unit. The chamber contains: Inlet section, which supplies liquid inflow; and The outlet is for the liquid and particles granulated by the cutting blade unit to flow out.

10. The granulation apparatus according to any one of claims 6 to 9, characterized in that, The cutting blade unit includes: A rotatable cutter shaft is connected to the shaft of a drive motor; A rotatable cutting edge connecting part, which is connected to the cutting blade shaft; and Multiple cutting blades, which are connected to the cutting blade connecting part. The cutting blade connecting part has a frustum-shaped profile. The rotation axis of the cutting blade connection is orthogonal to the bottom and top surfaces that form the frustum shape. The plurality of cutting blades are connected to the side surfaces that form the frustum shape. The plurality of cutting blades rotate along the side of the mold.

11. A method for manufacturing resin particles, characterized in that, Includes the following processes: (a) The process in which resin raw materials are discharged from the die of a granulator; and (b) A process, which follows process (a), granulates the discharged resin raw material. The mold has the following features: The bottom surface is circular when viewed from above; The upper surface is circular when viewed from above, concentric with the bottom surface, and has a radius smaller than that of the bottom surface; The side surface connects the outermost periphery of the bottom surface to the outermost periphery of the upper surface; and Multiple mold holes are formed on the side for discharging the resin raw material.

12. The method for manufacturing resin particles according to claim 11, characterized in that, The bottom surface, the top surface, and the side surface form a frustum shape.

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