JPH06143255A - Manufacture of resin pellet and rotor to be used therefor - Google Patents

Abstract

PURPOSE:To increase a time of an operation of an apparatus for manufacturing a resin pellet and to reduce a size by preventing adherence of resin to a cutter blade when a strandlike resin to be extruded from a resin extrusion hole of a die body is cut in the apparatus. CONSTITUTION:A resin extrusion hole formed at a periphery of a side of a cylindrical die body 11 is intermittently opened and closed by a valve unit having a groove 15 formed on a rotor 14 disposed in the body and a protrusion 16. A cutter blade 35 of a cutter 31 moving around the body 12 in synchronization with the rotation of the rotor 14 is closed by the valve unit to cut a strandlike resin output from a resin extrusion hole 12 stopped for extruding of the resin while spraying coolant thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin pellet manufacturing apparatus and a rotating body used in the apparatus. More specifically, a thermoplastic resin is extruded in a strand form from a resin extruding hole of a die body and cut by a cutter to form pellets. The present invention relates to an apparatus for manufacturing a machine and a rotating body which is an important component of the apparatus.

[0002]

2. Description of the Related Art Conventionally, this type of resin pellet manufacturing apparatus is disclosed in, for example, Japanese Examined Patent Publication No. 2-34766 and Japanese Examined Patent Publication No. 63-11.
No. 123, Japanese Patent Publication No. 62-35885 and the like are well known and well known. A conventional resin pellet manufacturing apparatus is basically provided with a disk-shaped die main body having a plurality of resin extrusion holes formed therein, and the exit side surface of the resin extrusion hole in the die main body is formed into a flat surface and the molten resin is Pellets were manufactured by continuously extruding through an extrusion hole, and cutting this with a rotating cutter while slidingly contacting the surface of the die body.

Usually, the molten resin extruded in a strand form from the resin extruding hole of the die body has a strong adhesive property, and therefore, in order to prevent the pellets from sticking to each other, the surface of the die body and the cutter are put in water and cut while cooling. Alternatively, the surface of the die body was brought close to the water surface, and the cut pellets were immediately dropped into water to prevent the pellets from sticking to each other.

[0004]

However, in such a conventional resin pellet manufacturing apparatus, there is a problem that the apparatus becomes very large because a water tank for cooling the pellet is required. In addition, when cutting the molten resin in the form of pellets into pellets with a cutter, the resin adheres to the cutter, albeit little by little, and there is also a problem that it gradually becomes a large mass and makes the cutter less sharp. The operation manager of the device had to stop the operation of the device and clean the cutter on a regular basis, which was very inefficient.

The object of the present invention is to solve the above-mentioned conventional problems, and when a small and strand-shaped molten resin is cut into pellets by a cutter, the resin does not adhere to the cutter. An object of the present invention is to provide a resin pellet manufacturing apparatus capable of continuously operating the apparatus for a long time and a rotating body used in the apparatus.

[0006]

[MEANS FOR SOLVING THE PROBLEMS] A resin pellet manufacturing apparatus of the present invention comprises, firstly, a die body having a resin extruding hole formed therein, and a valve device for periodically opening and closing the resin extruding hole of the die body. Moving along the die body on the side where resin is extruded from the resin extruding hole, passing through the front surface of the resin extruding hole when the resin extruding hole of the die body is closed and resin extruding is stopped. It is configured to include a cutter blade for cutting the resin discharged from the resin extrusion hole.

The second embodiment of the resin pellet manufacturing apparatus of the present invention is
Is a cylindrical die body in which a large number of resin extruding holes are formed on the side peripheral surface, and molten resin pressurized from a resin pressure supply device is extruded in a strand shape, and the side of the cylindrical die body. A cutter blade that rotates and moves along the peripheral surface, and a path formed between the cutter blade and its mounting plate, from the cutter blade toward the front in the circumferential direction of the die body, which is the rotational movement direction. And a cooling medium jetting means provided to jet the cooling medium.

The resin pellet manufacturing apparatus of the present invention is the third
In, a cylindrical die body having a large number of side surface peripheral resin extrusion holes formed therein, a valve device for periodically opening and closing the resin extrusion hole, and the resin extrusion hole of the die body opened by the valve device. A resin supply device for supplying molten resin into the cylindrical die body to push molten resin from the cutter body, a cutter blade that rotates and moves along the side peripheral surface of the cylindrical die body, and the cutter blade. Cooling medium ejection means provided to eject the cooling medium from the cutter blade toward the front in the circumferential direction of the die body, which is the rotational movement direction, through a passage formed between the mounting plate and the mounting plate. It is configured.

Further, the rotating body used in the resin pellet manufacturing apparatus of the present invention includes a valve device which forms a resin extrusion hole and which periodically opens and closes the resin extrusion hole of the die body provided at the bottom of the casing. A rotating body rotatably arranged in the casing, which is integrally provided with a resin pressurizing unit for pressurizing and extruding a molten resin from an extrusion hole, and is a groove portion formed on the surface on the back side of the die body. A peripheral recessed portion formed around the side portion of the rotating body to store the molten resin, and a portion between the molten resin introduction port of the casing and the peripheral recessed portion so as to pressurize and flow the molten resin into the peripheral recessed portion. A spirally-shaped feed groove is formed on the peripheral surface of the rotating body, and the groove portion formed on the surface of the rotating body that slidably contacts the back side of the die body and the groove portion adjacent thereto and relative to the groove portion. The protruding surface functions as a valve device that opens and closes the resin extruding hole by traversing the resin extruding hole inlet side of the die body, and the groove portion communicates with the peripheral recessed portion. .

[0010]

According to the resin pellet manufacturing apparatus of the present invention, the resin extruding hole of the die body having the resin extruding hole is periodically opened and closed by the valve device, whereby the molten resin extruded in a strand form from the resin extruding hole is The extrusion stop and the extrusion movement are repeated. The cutter blade rotates while slidingly contacting the die body surface on the exit side of the resin extrusion hole so that it crosses the outlet of each resin extrusion hole, and when the resin extrusion hole is closed by the valve device described above, that is, the extruded molten resin stops. This resin is cut into pellets while

In this way, if the cutter blade is used to cut when the resin is pushed out of the resin extrusion hole and its movement is stopped, a complicated sliding phenomenon due to the mutual movement of the cutter blade and the resin does not occur, so The adhesion of resin is very small, and therefore the cutting quality of the cutter blade does not deteriorate.

Further, in the case where the resin pellet manufacturing apparatus of the present invention is equipped with a cylindrical die body having a large number of resin extruding holes formed on the side peripheral surface, the resin pellet is rotated along the side peripheral surface. The moving cutter blade cuts the strand-shaped molten resin extruded from the resin extruding hole while ejecting the cooling medium from the tip side toward the front in the rotational movement direction.

Therefore, the cooling medium ejected from the tip side of the cutter blade is blown to the blade and the resin, and is scattered outward by the centrifugal force while cooling each, so that it does not impinge on the die body, and as a result, the resin Even if the molten resin is continuously extruded through the extrusion hole and cut, the resin does not adhere to the cutter blade, the cut pellets do not stick to each other, and the sharpness of the cutter blade does not deteriorate, and it runs for a long time. Is possible.

Further, in the resin pellet manufacturing apparatus of the present invention, a cylindrical die main body having a large number of resin extruding holes formed on the side peripheral surface is provided. In the case of a device that periodically stops, jets the cooling medium from the tip side and cuts the strand-shaped resin with a cutter blade that rotates along the peripheral surface of the side, the resin extruded from the resin extrusion hole The cutter blade is cut when the motion is stopped and the sharpness of the cutter blade is maintained for a long time in combination with the above-mentioned unique spraying of the cooling medium, and the operation efficiency is significantly improved and the device is downsized. Is achieved.

Further, according to the rotating body used in the resin pellet manufacturing apparatus of the present invention, the rotating body stores a spiral feed groove for pressurizing the molten resin introduced into the casing and the molten resin at the downstream side thereof. A peripheral recess is formed,
Further, a valve device including a groove portion formed on a surface of the die body near the resin extrusion hole inlet side rear surface and a protruding portion relatively exposed by the groove portion is formed. By rotating inside, the molten resin is pressed and the resin is intermittently extruded from the resin extrusion hole.

[0016]

EXAMPLES The resin pellet manufacturing apparatus of the present invention and the rotating body used in the apparatus will be described in more detail with reference to the examples shown in the drawings. FIG. 1 shows a resin pellet manufacturing apparatus 10 according to an embodiment of the present invention. The resin pellet manufacturing apparatus 10 of this embodiment includes a cylindrical die body 11, and a large number of resin extrusion holes 12 are formed on the peripheral surface of the die body 11. A casing 13 having the same inner diameter as the die body 11 is placed and fixed on the upper end of the die body 11.

A special rotating body 14 is arranged in a cylindrical inner space formed by the die body 11 and the casing 13. A large number of grooves 15 extending in the axial direction are formed on the peripheral surface of the lower end of the rotating body 14, and the grooves 15 are arranged at equal intervals in the circumferential direction. Becomes The groove 15 and the protrusion 16
Means to function as a valve device for opening and closing the resin extrusion hole 12 formed in the die body 11, and therefore the groove portion 1
5 is provided within the axial height range in which the resin extruding hole 12 is formed, and is provided so as to wrap around to the lower surface of the rotating body 14 for the reason described later.

A peripheral recess 17 for resin storage formed in the circumferential direction is provided in the axially upper part of the region where the groove 15 and the protrusion 16 are formed in the rotating body 14, and further in the axially upper peripheral surface part. Is provided with a plurality of spiral feed grooves 18 for feeding and pressurizing the resin to the peripheral recesses 17. Further, a peripheral concave portion 19 similar to the peripheral concave portion 17 is further provided in the axial upper portion of the spiral feed groove 18.

A large number of openings 20 are formed in the peripheral recess 19 so as to be arranged in the circumferential direction, and each of the openings 20 communicates with an axial internal passage 21 formed inside the rotating body 14, and The axial internal passage 21 communicates with the groove 15 on the bottom surface of the rotating body 14. A molten resin introducing port 22 is formed in a side wall portion of the casing 13 at a position corresponding to the peripheral recessed portion 19 of the rotating body 14, and the molten resin introducing port 22 of the molten resin introducing adapter 23 attached to the casing 13. It communicates with the passage 24.

When the rotating body 14 is placed in a cylindrical space formed by the casing 13 and the die body 11, the outer surface of the projecting portion 16 around the lower end is close to the inner surface of the die body 11 and has a spiral shape. The outer surface of the spiral portion that forms the feed groove 18 is also close to the inner surfaces of the die body 11 and the casing 13.

On the other hand, the die body 11 is supported by a support shaft 25 from below as shown in FIG. That is, the support shaft 25 has a small-diameter shaft portion at the upper end thereof inserted into the center opening of the bottom of the die body 11, and has a conical shape attached to the bottom surface of the die body 11 so as to close the open bottom surface of the rotating body 14 on the center side. Of the closing body 26, and the upper end shoulder portion of the large-diameter shaft portion abuts and supports the lower surface of the die body 11.

A rotary cylinder 27 is disposed on the outer peripheral surface of the support shaft 25 so as to be rotatable with respect to the support shaft 25 by a bearing 28 or the like. The upper end of the rotary cylinder 27 is not in contact with the lower surface of the die body 11 but is in contact with it with a slight gap, and a flange portion 29 is formed on the outer peripheral portion slightly below the outer peripheral portion so as to project radially outward. ing. This flange 29
A cutter device 31 is attached on the top.

Details of the cutter device 31 are shown in FIG. The cutter device 31 includes a mounting shaft 32 screwed into a mounting hole 30 formed in the upper flange portion 29 of the rotary cylinder 27, and a holding member 34 (in a small-diameter shaft portion 33 formed on the mounting shaft 32). 5) is pivotally mounted. A cutter blade 35 is attached to a portion of the holding member 34 facing the peripheral surface of the die body 11 where the resin extruding hole 12 is formed.

A spring or the like (not shown) applies a rotational force to the holding member 34 so that the cutter blade mounting side is constantly displaced in the circumferential direction of the die body 11, and thus the holding member 34 is attached to the holding member 34. The blade edge of the cutter blade 35 is in sliding contact with the outer peripheral surface of the die body 11 (a minute gap may be left open). Further, this holding member 34
As shown in FIG. 5, a groove-shaped recess 36, which serves as a passage for jetting cooling water, is formed on the cutter blade mounting surface of No. 3 extending in the direction of the blade edge, and the recess 36 is formed in a passage 37 formed in the holding member 34. And a cooling water feed passage 39 formed in the flange portion 29 of the rotary cylinder 27 via an axial passage 38 formed in the mounting shaft 32.

The cooling water supply passage 39 formed in the flange portion 29 of the rotary cylinder 27 communicates with the spiral groove formed on the outer surface of the rotary cylinder 27 as shown in FIG. 1, FIG. 2 or FIG. The spiral groove is fitted on the outside of the rotary cylinder 27 and fixed to the flange portion 29 by welding or the like.
Thereby functioning as a pressure supply passage, that is, a spiral passage 40. Therefore, the outer cylinder 41 also rotates integrally with the rotary cylinder 27.

The cooling water introduced into the spiral passage 40 is arranged in an axial vertical hole 42 formed in the central portion of the support shaft 25 as shown in FIGS. It flows out from the upper end opening into the vertical hole 42 and is supplied to the lower end of the spiral passage 40 through the horizontal hole 44 formed in the lower part of the support shaft 25. However, it goes without saying that various types of media such as oil can be used in addition to water as the cooling medium.

Next, the operation of the resin pellet manufacturing apparatus 10 will be described. The molten resin is in the passage 2 of the adapter 23.
4 is supplied to the peripheral concave portion 19 of the rotating body 14 through the molten resin introducing port 22 of the casing 13. This rotating body 14
Is rotated in the direction of the arrow shown in FIG. 2 by a rotation driving device (not shown), whereby the molten resin supplied to the peripheral recess 19 flows into the internal passage 21 of the rotating body 14 from a large number of openings 20 and at the same time spirals. Feed groove 18
Thus, the outer side of the rotating body 14 is pressure-fed downward.

The molten resin pressure-fed by the spiral-shaped feed groove 18 flows into the resin storage portion constituted by the peripheral recessed portion 17 and flows from there to a large number of groove portions 15 therebelow. By the way, due to the rotation of the rotating body 14, the projecting portions 16 between the groove portions 15 move while slidingly contacting the inner peripheral surface of the resin extrusion hole forming region of the die body 11, so that the resin extrusion holes 12
The groove portions 15 and the projecting portions 16 alternately pass through the openings of the above, and as a result, the resin extruding holes 12 are intermittently repeatedly communicated with the groove portions 15, and therefore the melting of the groove portions 15 is performed only when the resin extrusion holes 12 are in communication with the groove portions 15. The resin is extruded from the resin extrusion hole 12. That is, these protrusions 16 function as a valve device that opens and closes the resin extrusion hole 12.

The molten resin in the groove portion 15 is pushed out of the hole 12 while the groove portion 15 passes through the position of the resin extruding hole 12 while the rotating body 14 is rotating. The resin sent from the directional internal passage 21 enters the groove 15 on the side of the rotor 14 from the bottom opening of the rotor 14 through the groove 15 wrapping around the bottom surface, and is extruded from the extrusion hole 12. That is, the molten resin is the groove 15 of the rotor 14.
Since it flows in from above and from below and is pushed out from the resin extruding hole 12, the resin does not stagnate on the bottom surface side of the die body 11, and the flow of the resin can be secured at any place.

On the other hand, the rotary cylinder 27 is also rotationally driven in synchronization with the rotation of the rotary body 14, so that the cutter device 31 attached to the flange portion 29 of the rotary cylinder 27 causes the cutting edge of the cutter blade 35 to move to the die body 11. Resin extrusion hole 12
It moves while slidingly contacting the outer peripheral surface of the formation area of. At this time, the rotation of the rotary cylinder 27 is such that, as shown in FIGS. 5 and 6, the movement of the rotor 14 and the cutter device 31, the resin extruding hole 12 closed by the passage of the protrusion 16 which is the valve device. Is controlled in a synchronous relationship with the rotating body 14 such that the cutter blade 35 passes through the outlet of the. As a result, the resin extrusion hole 12
The resin extruded from is cut by the cutter blade 35 when the extrusion is stopped.

As described above, when the strand-shaped resin is cut by the cutter blade 35 when the resin is pushed out from the resin extrusion hole 12 and its movement is stopped, a complicated sliding phenomenon due to the mutual movement of the cutter blade 35 and the resin. Since it does not occur, the adhesion of resin to the cutter blade 35 is very small, and therefore, the sharpness of the cutter blade 35 is not deteriorated, which is an extremely advantageous advantage.

Further, the spiral passage 40 provided on the outer periphery of the rotary cylinder 27 is integrally rotated by the rotation of the rotary cylinder 27, and is introduced from the cooling water introduction pipe 43 into the vertical hole 42 formed in the central portion of the support shaft 25, and The cooling water flowing into the spiral groove through the lateral hole 44 is fed while being pressurized upward.
As a result, the cooling water is supplied to the cooling water supply passage 39 formed in the flange portion 29 of the rotary cylinder 27 and the axial passage 3 of the mounting shaft 32.
8 and the passage 37 of the holding member 34
4 to the cutter blade mounting surface concave portion 36, the cutter blade 3
It jets toward the rotation direction of the cutter blade 35 through the concave portion 36 which is formed as a passage with 5 as a wall surface.

As a result, the cooling water jetted from the cutting edge of the cutter blade 35 cools the cutter blade 35 itself, and at the same time is sprayed on the strand-shaped resin extruded from the resin extruding hole 12 which the cutter blade 35 is about to cut. By cooling this, it is possible to further prevent the cutter blade 35 from adhering to the cutting resin. Further, since this cooling water is spattered outward by the centrifugal force generated by the rotation of the cutter device 31, it does not impinge on the die body 11, and therefore no problem is caused by this.

In the above-described embodiment of the present invention, a resin extruding hole 12 is formed on the peripheral surface of the cylindrical die body 11, and the extruding hole 12 is intermittently opened and closed to move around the die body 11. Although the strand-shaped resin, which has stopped being extruded from the resin extruding hole 12 by the device 31, is cut while spraying cooling water, the present invention is not limited to this embodiment.

That is, in the present invention, the resin extruded from the resin extruding hole 12 of the die body 11 is stopped by the valve device, and the stopped strand resin is cut by the cutter device. It is possible to prevent the adherence of the blades, enable the operation of the apparatus for a long time, and prevent the sharpness of the cutter blade from decreasing.

Therefore, in such an embodiment, it is not necessary to have a structure as shown in FIG. 1 in which a resin extruding hole is formed on the peripheral surface of the cylindrical die body and the cutter device is moved on the peripheral surface. Instead, for example, as in the embodiment shown in FIGS. 8 and 9, the die body 41 has a tubular shape arranged in the lateral direction, and the resin extruding hole 42 is formed on a virtual concentric circle centered on the central axis at its circular end surface. The rotator 43 is formed and arranged, and the rotator 43 is arranged horizontally in a horizontal direction.
A valve device may be configured in which the groove portions 44 and the protruding portions 45 are alternately formed on the end surface of the valve device.

In the case of this embodiment, the molten resin pressure-fed by the spiral feed groove 46 of the rotating body 43 is a space for resin storage around the small diameter portion 47 at the right end of the rotating body 43 as seen in FIG. When the groove 44 passes through the resin extruding hole 42 during the rotation of the rotating body 43, the resin is extruded in a strand shape from the hole 42 and the projecting portion 45 passes. Resin extrusion hole 4
2 is closed and the extrusion of resin is stopped.

At that time, that is, when the resin extruding hole is closed, the cutter blade 49 of the cutter device is slidably passed through the outlet side of the hole and the extruded strand-shaped resin is cut.

FIGS. 10 and 11 show another example of the structure,
Since the basic structure is the same as that of FIGS. 8 and 9, the same or corresponding parts are designated by the same reference numerals. In this example, the surface of the die body 41 on which the resin extruding holes 42 are formed is an inclined surface, and even with such a shape, the same effect as that of the embodiment shown in FIGS. 8 and 9 is obtained. Play.

Further, in the resin pellet manufacturing apparatus of the present invention, the resin extruded from the resin extruding hole is once stopped and then cut using the valve device formed on the rotating body as described above. When the means for spraying the cooling water from the apparatus is adopted, it is not always necessary to stop and cut the resin extruded from the resin extruding hole once.

That is, as shown in FIG. 12, the rotating body as shown in FIG. 3 is not arranged inside the cylindrical die main body 11 having the resin extruding holes formed on the peripheral surface, and is directly melted inside. Resin is introduced. Thereby, the molten resin is extruded from the resin extruding hole 12 at a time as shown by the arrow, and the cutter device 3 that rotates the peripheral surface of the die body 11 is rotated.
It is sequentially cut by 1. At this time, the cutter device 31
The strand-shaped resin to be cut has different lengths until the first half rotation (when there are two cutter devices 31), but after that, the resin from any of the extrusion holes has the same resin again. Since the amount of extrusion is the time until it reaches the extrusion hole, it is cut into the same length.

In this case, the cooling water is jetted from the blade tip of the cutter blade 35 of the cutter device 31 in the moving direction thereof as described with reference to FIG. 1, thereby cooling the strand resin cut with the cutter blade. To do. As a result, it is possible to considerably prevent the resin from adhering to the cutter blade without stopping the extruded resin once.

However, in such a case, that is, when the resin is continuously extruded from the resin extruding hole of the die body without using the valve device and is cut by the cutter device which moves while jetting the cooling water, the cooling water is used. In order to prevent spraying of the die body onto the die body, the resin pellet manufacturing apparatus has a cylindrical shape with a vertical central axis as shown in FIG. A cutter device that moves around must be used as a basic configuration.

[0044]

As described above, according to the resin pellet manufacturing apparatus of the present invention and the rotating body used therefor, the adhesion of resin to the cutter blade is significantly reduced and the sharpness of the cutter blade is not deteriorated. As a result, the apparatus can be operated for a long time, the operation efficiency can be remarkably increased, the productivity can be greatly improved, and the size reduction can be achieved at the same time. Further, according to the rotating body used in this device, the molten resin is pressure-fed to the resin extruding hole of the die body by a very simple structure, and at the same time, the resin extruding hole is opened and closed to extrude the resin from the resin extruding hole. It can be stopped intermittently.

[Brief description of drawings]

FIG. 1 is a perspective view showing a resin pellet manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a main part of the resin pellet manufacturing apparatus shown in FIG.

FIG. 3 is a perspective view showing a rotating body that constitutes the resin pellet manufacturing apparatus shown in FIGS. 1 and 2.

FIG. 4 is a partial cross-sectional view showing, on an enlarged scale, a cutter device attachment portion in the resin pellet manufacturing apparatus shown in FIG.

5 is a cross-sectional view of a cutter blade of the cutter device shown in FIG. 4 viewed from above.

6 is a configuration explanatory view for explaining a positional relationship between a resin extrusion hole of a die body and a groove portion and a protruding portion of a rotating body in the resin pellet manufacturing apparatus shown in FIG. 1, and an operational relationship with a cutter device.

7 is a configuration explanatory view similar to FIG. 6 showing the positional relationship between the rotating body and the cutter device shown in FIG. 6 in a state in which the cutter device has moved to the next resin extrusion hole. Is.

FIG. 8 is a front view showing a die body in a resin pellet manufacturing apparatus according to another embodiment of the present invention, with the upper half cut away from the center line.

9 is a partial cross-sectional view of the resin pellet manufacturing apparatus shown in FIG.

FIG. 10 is a front view showing a die body of a resin pellet manufacturing apparatus according to still another embodiment of the present invention, similar to FIG.

11 is a partial cross-sectional view of the resin pellet manufacturing apparatus shown in FIG.

FIG. 12 is a sectional view showing a die body and a cutter device according to a resin pellet manufacturing apparatus according to still another embodiment of the present invention.

[Explanation of symbols]

 10 Resin Pellet Manufacturing Equipment 11 Die Main Body 12 Resin Extrusion Hole 13 Casing 14 Rotating Body 15 Groove 16 Protrusion 17 Peripheral Recess 18 Spiral Feeding Groove 19 Peripheral Recess 20 Opening 21 Axial Internal Passage 22 Molten Resin Introduction Passage 25 Support Shaft 27 Rotation Cylinder 29 Flange portion 31 Cutter device 35 Cutter blade 36 Cavity for water jet passage 40 Spiral passage 41 Outer cylinder

Claims (4)

[Claims] 1. A die body having a resin extrusion hole formed therein,
A valve device that periodically opens and closes the resin extrusion hole of the die body, moves along the die body on the side where resin is extruded from the resin extrusion hole, and the resin extrusion hole of the die body is closed. A resin pellet manufacturing apparatus comprising: a cutter blade that cuts the resin that has passed through the front surface of the resin extrusion hole and has exited from the resin extrusion hole when the extrusion of the resin is stopped. 2. A cylindrical die main body having a large number of resin extruding holes formed on a side peripheral surface thereof, from which molten resin pressurized from a resin pressure supply device is extruded in a strand shape, and the cylindrical die main body. A cutter blade that rotates and moves along the side peripheral surface of the die, and a front of the die body circumferential direction that is a rotational movement direction from the cutter blade through a groove formed between the cutter blade and the mounting plate thereof. And a cooling medium jetting means provided to jet the cooling medium toward the resin pellet manufacturing apparatus. 3. A tubular die body having a large number of resin extruding holes on its side peripheral surface, a valve device for periodically opening and closing the resin extruding hole, and the die body opened by the valve device. A resin supply device that supplies molten resin into the tubular die body to push molten resin from a resin extrusion hole, a cutter blade that rotates and moves along the side peripheral surface of the tubular die body, and Cooling medium jetting means provided to jet a cooling medium forward from the cutter blade in the circumferential direction of the die body, which is the rotational movement direction, through a passage formed between the cutter blade and its mounting plate. A resin pellet manufacturing apparatus including. 4. A valve device for forming a resin extruding hole and periodically opening and closing the resin extruding hole of a die body provided at a lower portion of a casing, and a resin pressurizing for extruding a molten resin by pressurizing the molten resin through the resin extruding hole. Means integrally provided, a rotating body rotatably arranged in the casing, the groove portion formed on the rear surface of the die body, and formed around the side portion of the rotating body, A peripheral recess for storing the molten resin, and a feed groove formed in a spiral shape on the peripheral surface of the rotating body between the molten resin introduction port of the casing and the peripheral recess so as to pressurize and flow the molten resin into the peripheral recess. The resin extrusion of the die body, wherein the groove portion formed on the surface of the rotating body that slidably contacts the rear surface side of the die body, and the protruding surface adjacent to the groove portion and relatively protruding with respect to the groove portion. Hole An apparatus for producing resin pellets, which functions as a valve device that opens and closes the resin extrusion hole by traversing the mouth side, and the groove portion communicates with the peripheral recessed portion.