JP3365735B2 - Underwater cutting granulator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater cutting granulator used for producing resin pellets.

[0002]

2. Description of the Related Art As shown in FIG. 16, an underwater cutting granulator is provided with a die 2 on one side of a water chamber 1 and is capable of advancing and retracting toward the die 2 and rotating on the other side. The cutter 3 is provided. A water supply device (not shown) is connected to the water chamber 1 so that water can be circulated and supplied into the room, and a resin supply device (not shown) such as a gear pump is connected to the die 2, The molten resin 4 from a resin kneader (not shown) or the like can be pressurized and supplied into the water chamber 1 through the die nozzle 2a.

The cutter 3 is provided with a knife holder 6 at the tip of the rotary shaft 3a on the die 2 side, as shown in FIG.
As shown in FIG. 3, a plurality of knives 30 are provided on the knife holder 6 in a radial arrangement. As shown in FIG. 18, the knife 30 has a blade portion 31 that exerts a resin cutting action, and a mounting base portion 32 that holds the blade portion 31 radially outward with respect to the rotating shaft 3a (knife holder 6). is doing.

From the above, the molten resin 4 extruded from the die nozzle 2a of the die 2 into the water chamber 1 is cooled with water and at the same time finely cut by the cutter 3 and granulated (see reference numeral 5). It will be. By the way, in this type of underwater cutting granulator, in order to obtain pellets having a neatly cut shape, the blade portion 31 of the knife 30 is provided with a blade portion 33 which is the tip side in the rotation direction of the die 2.
It is said that it is preferable to rotate it while pressing it strongly against the front of (there is a gap in the drawing).

Therefore, the cutting edge portion 33 is slightly projected toward the die 2 side from the mounting base portion 32, and the overall length dimension H as the blade portion 31 along the direction of the rotation axis is formed thick. The blade portion 31 is configured to withstand the bending in the radial direction and the axial direction, but this causes a large rotational resistance of the knife. Therefore, the present inventors have filed Japanese Patent Application No. 9-67.
In Japanese Patent Application No. 432 and Japanese Patent Application No. 9-182806 (neither of them is a publicly known technique), an underwater cutting granulator is proposed, and it is possible to reduce the rotational resistance of the knife against water to suppress turbulence and cavitation. Became.

[0006]

However, in any of the underwater cutting granulators, in any case, as described above, the blade tip portion 33 of the blade portion 31 of the knife 30 is strongly pressed against the front surface of the die 2 to rotate. However, there is a problem that pellet defects caused by defective cutting due to bending of the knife 30 and breakage of the knife 30 occur.

Then, as a result of earnest research, the present inventors have found that the cause is largely influenced by the connection between the rake face of the blade and the mounting base regardless of the shape of the blade of the knife. The present invention has been made based on the above findings, by increasing the strength such that bending deformation of the knife blade portion does not occur, pellet defects and knives due to defective cutting due to bending of the knife The damage of the blade is reliably prevented, and at the same time, the rotational resistance of the knife against water is reduced to suppress turbulence and cavitation, and the water flow in the swirling direction along the front of the die is slowed down, thus only improving drive efficiency. Another object of the present invention is to provide an underwater cutting granulator capable of preventing the occurrence of shape defects when a high MFR material or the like is used.

[0008]

In order to achieve the above object, the present invention takes the following technical means. That is, in the underwater cutting and granulating apparatus according to the present invention, similarly to the conventional case, the knife of the cutter has a blade portion that exerts a resin cutting action, and a mounting base portion that projects and holds the blade portion radially outward with respect to the knife holder. And has a notch that serves as a connecting portion between the rake face portion of the blade portion and the mounting base portion on the surface of the knife facing the knife holder side, the underwater cutting granulator according to the present invention The cut portion is formed such that a necessary length is secured at the blade tip portion of the blade portion and the back side thereof is inclined at a predetermined angle toward the protruding direction of the blade portion.

That is, since the mounting base of the knife is fixed to the knife holder, it can be considered that deformation such as bending does not occur, but by tilting the notch at a predetermined angle as described above, The attachment base portion (that is, the portion that is thickly formed as a knife) extends substantially in the protruding direction of the blade portion. Therefore, without taking measures such as thickening the blade portion side, the blade portion will not be deformed such as bending when the cutter is rotated, and thus regardless of the type of knife. It was possible to prevent pellet defects and knife breakage.

From the viewpoint of strength, it is preferable to position the cut top of the knife as radially outward as possible, but the cut top should be positioned further outward than the knife holder. It is unsuitable because it reduces the effective working area of the blade (the area used for cutting the molten resin). Therefore, it is optimal to provide the cut-out portion so as to be in contact with the outer peripheral portion of the knife holder.

When the knife is attached to the knife holder, if the knife is allowed to have a receding angle with respect to the rotation direction of the cutter, the inclination of the notch is increased without increasing the effective working area of the blade. It is possible and preferable. Moreover, by making the knife have a receding angle and making the cut upper portion circumscribe the outer peripheral portion of the knife holder in this manner, the cutting flow is prevented against the water flow generated between the blade portion and the water when the cutter is rotated. There is also an advantage that the inclination angle of the upper portion is in a parallel state, and as a result, the draining resistance (rotational resistance of the blade portion) due to the cut upper portion can be suppressed to be small.

From the above, the length of the knife blade in the direction of the rotation axis can be made thin, and if the blade can be made thinner, the rotation resistance against water is further reduced, and the cutter can rotate during rotation. The water flow in the swirling direction generated along the front surface of the die can also be slowed down. Therefore, the turbulent flow generated on the rear side in the rotation direction of the knife is suppressed to a small level, which leads to suppression of cavitation, thereby suppressing the consumption of the cutter driving force and enhancing the driving efficiency thereof.

Further, even with a high MFR material or the like, it becomes possible to granulate with the occurrence of shape defects suppressed as much as possible, and various defects caused by these shape defects can be prevented. On the other hand, when the water flow guide surface is formed on the blade portion of the knife, the rotational resistance of the knife to water can be reduced. The water flow guide surface includes a mountain water flow guide surface and a valley water flow guide surface, and both of these water flow guide surfaces have the action of directing the water flow to the die.

Therefore, on the rear side in the rotational direction of the blade portion, the separation of the water flow becomes smooth, the rotation resistance is reduced, and therefore the generation of turbulence and cavitation is suppressed.
Therefore, it is possible to more reliably and satisfactorily improve the above-mentioned driving efficiency and prevent shape defects when using a high MFR material or the like.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show a knife 7 of a first embodiment used in a cutter 3 of an underwater cutting granulator according to the present invention. It should be noted that, as a basic configuration of the underwater cutting and granulating apparatus, the point that the water chamber 1, the die 2 and the cutter 3 are provided is as described in FIG. 16, and the knife 30 in FIG. do it.

The knife 7 is a blade portion 1 having a resin cutting action.
5 and a mounting base portion 16 for holding the blade portion 15 so as to project from the knife holder 6 provided at the tip end portion of the rotary shaft 3a outward in the radial direction thereof. The blade portion 15 is a rake face portion 1 having a rake angle toward the die 2 on the front side in the rotation direction.
7 and a flat plate portion 18 on the rear side thereof, and the tip edge of the rake face portion 17 serves as a cutting edge portion 19. Further, on the surface of the knife 7 facing the knife holder 6 side, the blade portion 15
A notched portion 20 is provided at a connecting portion (boundary) between the rake face portion 17 and the mounting base portion 16.

As shown in FIG. 4 (A), the notch 20 has a required length in the longitudinal direction of the blade tip portion 19 of the blade portion 15, and the back side 15a of the blade portion 15 is closer to the blade portion 15a. Is formed by inclining by a predetermined angle θ in the protruding direction of (the triangular region shown by the two-dot chain line in FIG. 4A is added to the conventional knife 30). .

That is, since the mounting base 16 of the knife 7 is fixed to the knife holder 6, it can be considered that deformation such as bending is unlikely to occur.
By tilting 0 at a predetermined angle θ, the attachment base 16 (that is, a portion that is thickly formed as the knife 7) is substantially extended in the protruding direction of the blade portion 15, and Strength will be enhanced.

FIG. 4 (B) shows the blade portion 15 of the knife 7 in a streamlined shape, and the cut upper portion 20 is shown in FIG. 4 (A).
Is the same as. As shown in FIGS. 7 and 8, in the cutter 3 in which the knives 7 are mounted, the blade portion 15 of each knife 7
While keeping the part of the
When a strength test of the knife 7 that applies an axial force F of 200 kgf to the contact table 25 is performed on a, the amount of depression X (μm) of the rotating shaft 3a and the amount of lifting of the blade 15 on the protruding end side are shown. The maximum deflection δmax obtained as the sum with Y (μm) was 18.8 μm.

The value of the maximum deflection δmax is 37.5 μm when the conventional knife 30 is strength tested under the same conditions.
It can be seen that the knives of the present invention have been halved compared to the above, and it can be predicted that the knife 7 according to the present invention can reduce the stress more than the conventional knife 30. Therefore, in the knife 7 according to the present invention, the blade portion 15
The height dimension h (see FIG. 5) in the direction of the rotation axis can be made thin, and the rotation resistance to water can be reduced,
The water flow in the swirling direction generated along the front surface of the die 2 when the cutter 3 rotates can be slowed down. Therefore, the turbulent flow generated on the rear side in the rotation direction of the knife 7 is suppressed to a small level, which leads to suppression of cavitation.

From the viewpoint of strength, it is preferable to position the notch 20 on the knife 7 as radially outward as possible. However, the notch 20 is positioned further to the outer peripheral side than the knife holder 7. What is done is as the blade part 15,
Since it is unsuitable in that it reduces the effective working area that beneficially works for resin cutting and the like, it is preferable to provide the cut upper portion 20 so as to be in contact with the outer peripheral portion of the knife 7 holder. Recommended.

The knife 7 generally has a receding angle β with respect to the rotating direction of the cutter 3 (see FIG. 6) for reasons such as pellet cutting efficiency, shaping performance, and suppression of water flow resistance.
It is preferable to attach the knife holder 6 to the knife holder 6 in a state where it is held. Therefore, as described above, the notch 20 is placed on the knife 7
It is necessary for the cutter 3 to be in contact with the outer periphery of the holder.
When the blade 20 is rotated, the inclination angle of the notch 20 is parallel to the water flow generated between the blade 15 and the water, and the notch 20
It is also useful for further suppressing the drainage resistance (rotational resistance of the blade portion 15) due to.

Of course, doing so leads to reasonably increasing the inclination of the notch 20 without damaging the effective operating area of the blade 15. Receding angle β of knife 7
Although depending on the above, the angle (the angle obtained by subtracting the above-described predetermined angle θ from 90 °) of the notch 20 with respect to the blade tip portion 19 of the blade portion 15 is 40 ° or more and 80 ° or less. It was preferable that the angle was 50 ° or more and 70 ° or less.

FIG. 9 shows the mounting base 16 side with the same thickness as the length of the blade 15 with respect to the surface between the blade 15 and the mounting base 16 and facing the die 2. A knife 50 of a comparative example provided with a thickened portion 21 extending in a plane triangular shape.
Is shown. In the knife 50 of this comparative example, the thickened portion 21 is pressed against the front surface of the die 2 at the same time as the blade tip portion 19 of the blade portion 15, whereby the strength of the knife 50 is enhanced. .

However, with the knife 50 of this comparative example, since it is necessary to bring the thickening portion 21 into contact with the die 2, the existing underwater cutting and granulating apparatus cannot be used as it is, and at least it cannot be used. For the die 2, it is necessary to replace it with a smaller inner diameter of the donut disk shape (in FIG. 3, assuming that the thickened portion 21 is provided, the position where the inner diameter of the die 2 should be positioned). Z is also shown).

Therefore, the manufacturing cost of the die 2 may be an extra burden. In addition, in order to avoid such a remake of the die 2, a method of shifting the formation position of the thickened portion 21 toward the protruding direction of the blade portion 15 is conceivable.
In this case, since it is necessary to block the die nozzle 2a provided near the inner diameter of the die 2, the effective working area is reduced accordingly, and another problem such as a decrease in pellet production amount occurs. become.

Therefore, as compared with the knife 50 of this comparative example, the knife 7 according to the present invention does not require remake of the die 2 and the effective operating area of the blade portion 15 does not become small, so that the amount of pellets produced is also small. It is excellent in that it does not decrease. 10 and 11 show a second embodiment according to the present invention.
The knife 7 of embodiment is shown. In the knife 7 of the second embodiment, a surface 7a (hereinafter, referred to as an "outer surface 7a") of the blade portion 15 that faces away from the die 2 (hereinafter referred to as "outer surface 7a") is curved in a mountain in the vicinity of an intermediate portion in the rotation direction. Then, it is formed so as to be inclined downward toward the die 2 on the rear side in the rotation direction. In addition, the surface 7b facing the die 2 (hereinafter, referred to as "inner surface 7
"b") has its rear side in the rotation direction formed into a flat surface substantially parallel to the front surface of the die.

For this reason, the blade 15 of the knife 7 has a length dimension h in the direction of the axis of rotation that is considerably thinner than the height dimension H of the conventional knife 30 (see the chain double-dashed line). Further, the wall thickness of the blade portion 15 itself is considerably thin. Therefore, the knife 7 has a small rotational resistance to water, and even if the knife 7 is rotated at a high speed, the water flow in the swirling direction generated along the front surface of the die 2 is not so high. In addition, the effect of suppressing the generation of turbulence can be obtained on the rear side in the rotation direction of the knife 7.

Moreover, the curved surface provided on the outer surface 7a forms the mountain-shaped water flow guide surface 9 as described above. The mountain-shaped water flow guide surface 9 is obtained by outwardly bending the outer surface 7a in a direction that does not interfere with the water flow parallel to the front surface of the die 2 (away from) at the direction of the water flow, that is, on the rear side in the rotation direction of the knife 7. Is. Therefore, the outer surface 7 of the knife 7
The water flow along a passes over the mountain-shaped water flow guide surface 9 and, at the same time, is subjected to the suction action to the outer surface 7a side, and as a result, the die 2 is separated from the rear side in the rotational direction of the knife 7.
Will be drawn to the side. Therefore, this stream is
The knife 7 is smoothly separated from the rear side in the rotation direction, and turbulence and cavitation are suppressed.

As described above, even if the knife 7 rotates at high speed, the water flow in the swirling direction generated along the front surface of the die 2 does not speed up, and turbulence hardly occurs and cavitation hardly occurs. It is possible to obtain various advantages in that the consumption of the powder can be suppressed, the driving efficiency can be increased, and the occurrence of shape defects can be prevented even when a high MFR material or the like is used.

FIG. 12 shows a knife 7 according to a third embodiment of the present invention. In the third embodiment, only a mountain-shaped water flow guide surface 9 is formed on the outer surface 7a of the knife 7. Instead, the valley-shaped water flow guide surface 10 is also formed on the inner surface 7b. The valley-shaped water flow guide surface 10 has the inner surface 7b directed toward the water flow, that is, on the rear side in the rotation direction of the knife 7,
It is bent inward in a direction in which it interferes with the water flow parallel to the front surface of the die 2.

Therefore, the water flow along the inner surface 7b of the knife 7 is deflected by physical contact as it approaches the rear side in the rotational direction of the knife 7, and as a result, tends to separate from the rear side in the rotational direction of the knife 7. When it is done, it will be pressed against the die 2 side. Therefore, this water flow is also smoothly separated from the rear side in the rotational direction of the knife 7, like the water flow guided to the mountain-shaped water flow guide surface 9, and the occurrence of turbulence and cavitation is suppressed.

Further, when both the mountain-shaped water flow guide surface 9 and the valley-shaped water flow guide surface 10 are provided in this manner, when the water flows separated from the rear side of the knife 7 in the rotational direction, they join each other. Since the water force is increased, the above effect has the advantage of being synergistically increased. Therefore, in the third embodiment, it is possible to obtain an effect that is at least superior to the case of the second embodiment.

In the second and third embodiments, since the water flow on the rear side in the rotation direction of the knife 7 has a strong action toward the die 2, the knife 7 has a reaction to this action as a reaction to the die 2.
Lifting force is generated to try to move away from. Therefore, the pressing action of the knife 7 against the front surface of the die 2 is reduced, and both have the side effect of suppressing wear. Further, in the third embodiment, since the mountain-shaped water flow guide surface 9 and the valley-shaped water flow guide surface 10 are both formed by curved surfaces, the knife 7
The cross-sectional shape of the above is also streamlined with the whole being surrounded by a curve, and there is also an advantage that resistance to water in the rotational direction becomes extremely small. In particular, it is preferable that the outer surface 7a has a smooth curved surface at the mountain portion of the front end in the rotation direction.

The mountain-shaped water flow guide surface 9 and the valley-shaped water flow guide surface 1
0 may be a bent curved surface formed by joining a plurality of flat surfaces like the knife 7 of the fourth embodiment shown in FIG.
In addition, like the knife 7 of the fifth embodiment shown in FIG. 14,
A valley-shaped water flow guide surface 10 is formed auxiliary to the outer surface 7a on the rear side in the rotation direction with respect to the mountain-shaped water flow guide surface 9, or on the inner surface 7b on the rear side in the rotation direction with respect to the valley-shaped water flow guide surface 10. It is also possible to form the mountain-shaped water flow guide surface 9 as an auxiliary.

The purpose of doing this is to make adjustments for the most effective slowing of the water flow, depending on the capacity (size, applied rotation speed, etc.) of the cutter 3 and operating conditions. A valley-shaped water flow guide surface 10 of the outer surface 7a provided auxiliary
It goes without saying that the mountain-shaped water flow guiding surface 9 of the inner surface 7b does not absorb or hinder the original functions of the mountain-shaped water flow guiding surface 9 of the outer surface 7a and the valley-shaped water flow guiding surface 10 of the inner surface 7b.

Further, like the knife 7 of the sixth embodiment shown in FIG. 15, the outer surface 7a and the inner surface 7b are formed into a curved surface whose radius of curvature gradually decreases from the front side toward the rear side in the rotation direction, and the inner surface is formed. It is also possible to form a flat inclined surface 7c inclined at an elevation angle α with respect to the rotation direction on the rear side of the rotation direction of 7b. By the way, the present invention is not limited to the above embodiments.

For example, in the knife 7, the slope of the notch 20 may be linear or curved. In addition, as a material for forming the knife 7, TIC, SKH, SUS, and other appropriate materials can be used. In addition, a detailed shape of the knife 7, the number of the knife 7 to be attached to the cutter 3, and an underwater cutting granulator. The detailed configuration and the like can be changed as appropriate.

Further, the use of a high MFR material as the molten resin 4 is not limited, and the material thereof is not particularly limited.

[0040]

As is clear from the above description, in the underwater cutting and granulating apparatus according to the present invention, the cutting surface of the knife on the side facing the knife holder and the connecting portion between the rake face of the blade and the mounting base are provided. Since the cutting part is inclined so that it goes to the protruding side of the blade part from the cutting edge part of the blade part to the back side, it is purposely to thicken the blade part side regardless of the type of knife. Even if the above measure is not taken, the blade portion will not be deformed such as bending when the cutter is rotated.

Therefore, it is possible to prevent pellet defects and knife breakage caused by defective cutting due to bending of the knife, and at the same time, the blade portion of the knife can be made thinner, thereby reducing the rotation resistance and slowing down the swirling water flow in front of the die. The turbulent flow and cavitation are suppressed, and as a result, the consumption of the cutter driving force is suppressed and the driving efficiency thereof is improved. Further, even with a high MFR material or the like, it becomes possible to granulate with the occurrence of shape defects suppressed as much as possible, and various defects caused by these shape defects can be prevented.

Moreover, by adopting such a knife, it is not necessary to remake the die, and the existing knife holder can be used as it is. Therefore, the conventional underwater cutting granulator is modified. In this case, there is an advantage in that a cost burden is scarcely generated, and the labor for exchanging the knife can be extremely simple.

By making the knife have a receding angle so that the inclination of the cut upper portion is in contact with the outer peripheral portion of the knife holder, the draining resistance (rotational resistance of the blade portion) by the cut upper portion can be further reduced. There are advantages. On the other hand, if a water flow guide surface is provided on the knife to direct the water flow to the die,
Smooth separation of water flow from the knife, suppression of turbulence and cavitation, and slowing of swirling water flow in front of the die. Therefore, the efficiency of the cutter driving force is further improved,
In addition, reliable granulation with a high MFR material or the like becomes possible.

[Brief description of drawings]

FIG. 1 is a plan view (a partially enlarged view of FIG. 6) showing a first embodiment of a knife used in an underwater cutting granulator according to the present invention.

FIG. 2 is a front view corresponding to FIG.

3 is a bottom (back) side view corresponding to FIG. 1. FIG.

FIG. 4 is a perspective view corresponding to FIG. 1, in which FIG.
An example (B) is a second example.

5 is an enlarged sectional view taken along line BB of FIG.

FIG. 6 is a view showing a cutter equipped with the knife of the first embodiment (corresponding to a line AA arrow in FIG. 16).

FIG. 7 is a schematic diagram showing the procedure of a strength test in the first embodiment.

FIG. 8 is an explanatory diagram of a result of a strength test.

FIG. 9 is a perspective view showing a knife of a comparative example with respect to the first embodiment.

FIG. 10 is an operation explanatory view of the knife of the second embodiment.

FIG. 11 is an enlarged cross-sectional view of a blade portion according to the second embodiment.

FIG. 12 is an enlarged sectional view showing a blade portion of a knife of a third embodiment.

FIG. 13 is an enlarged sectional view showing a blade portion of a knife of a fourth embodiment.

FIG. 14 is an enlarged sectional view showing a blade portion of a knife of a fifth embodiment.

FIG. 15 is an enlarged cross-sectional view showing a blade portion of a knife of a sixth embodiment.

FIG. 16 is a side sectional view showing an underwater cutting granulator equipped with a conventional knife.

17 is an enlarged view taken along the line AA of FIG.

FIG. 18 is an enlarged view taken along line DD of FIG.

[Explanation of symbols]

1 water chamber Two dies 3 cutters 3a rotating shaft 4 Molten resin 7 knife 9 Mountain type water flow guide surface 10 Valley type water flow guide surface 15 blade 15a Dorsal side 16 Mounting base 17 Rake face 19 Cutting edge part 20 top h Length dimension θ Specified angle at the top β receding angle

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinori Kuroda 2-3-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture Kobe Steel Works Takasago Works (72) Inventor Masahiko Kashiwa, Niihama, Arai-cho, Takasago, Hyogo Prefecture No. 3 No. 1 in Takasago Works, Kobe Steel, Ltd. (56) Reference JP-A-60-73811 (JP, A) JP-A-59-123615 (JP, A) JP-A-11-179723 (JP, A) JP-A-11-165316 (JP, A) JP-A-11-28723 (JP, A) JP-A-10-151622 (JP, A) JP-A-9-57745 (JP, A) JP-A-8-142049 (JP, A) JP-A-4-226303 (JP, A) Actually opened 62-104914 (JP, U) Actually opened 61-105114 (JP, U) Actually opened 49-51862 (JP, U) Actual Kaihei 5-60813 (JP, U) Japanese Patent Sho 50-2475 (JP, B1) Japanese 2905472 (JP, B2) PCT National flat 11-504275 (JP, A) (58 ) investigated the field (Int.Cl. ^7, DB name) B29B 9/00 - 11/16 B01J 2/00 - 2/30

Claims (3)

(57) [Claims] 1. A molten resin (4) extruded from a die (2) into a water chamber (1) is cut by a cutter (3) which is rotated with a knife (7) facing the die (2). In the underwater cutting and granulating apparatus for granulating, the knife (7) of the cutter (3) has a blade portion (15) that exerts a resin cutting action, and the blade portion (15) that rotates the rotary shaft of the cutter (3) ( 3a) is provided with a mounting base portion (16) which projects and holds the knife holder (6) outward in the radial direction, and a surface of the knife (7) facing the knife holder (6) side. The rake face (17) of the blade (15) and the mounting base (1
6) is a cutting part (20) which is a connection part with a blade part (15)
Is toward the back side upon which is secured the required length the cutting edge portion (19) (15a) as the blade portion to the projecting direction (15) formed to be inclined a predetermined angle (theta), the switching upper (20 )
Is 40 ° or less with respect to the blade tip portion (19) of the blade portion (15).
The knife (7) is tilted at an angle (90 ° -θ) of 80 ° or less, and the knife (7) with respect to the rotation direction of the cutter (3).
Projected from the knife holder (6) with a receding angle (β)
And the cut-out (20) of the knife holder (6)
An underwater cutting and granulating apparatus, which is provided so as to circumscribe the outer peripheral portion . 2. The knife (7) has a blade (15) surface.
A water flow guide that guides the water flow flowing along the surface toward the die (2)
The underwater cutting and granulating apparatus according to claim 1, wherein the guide surfaces (9) (10) are formed . 3. The water flow guide surface of the knife (7).
A mountain-shaped water flow guide surface (9) formed on the outer surface (7a), and
A valley-shaped water flow guide formed on the inner surface (7b) of the knife (7).
The underwater cutting and granulating apparatus according to claim 2, wherein the underwater cutting and granulating apparatus is constituted by a guide surface (10) .