JP5619098B2 - Centrifugal dehydration dryer for synthetic resin pellets and dehydration drying method thereof - Google Patents

Description

  The present invention relates to a centrifugal dehydrator for synthetic resin pellets and a drying method thereof, and in particular, has a plurality of dewatering rotary blades and a drying rotary blade on the outer periphery of the rotary body, and the dehydration rotary blades are on the surface of the rotary body. The present invention relates to a novel improvement for increasing the dehydration drying ability by inclining a predetermined inclination angle from the normal direction to the above.

FIG. 6 schematically shows a conventional method for producing synthetic resin pellets. The synthetic resin raw material 1 supplied into the extruder 2 is melted in the extruder 2 and extruded from the die 3. Is done. The extruded molten synthetic resin is cut into a predetermined size in warm water by the underwater cutter 4, cooled and solidified by the warm water 9, and synthetic resin pellets 13 are generated.
Hot water 9 is stored in a hot water tank 8 and circulated and conveyed by a pump 7.
The slurry 5, which is a mixture of the synthetic resin pellets 13 and the hot water 9 cut by the underwater cutter 4, is conveyed to the dehydrator 10 through the pipe 6. Most of the hot water 9 is separated by the dehydrator 10 and returned to the hot water tank 8. On the other hand, the remaining slurry 5, which is a mixture of a small amount of hot water 9 and synthetic resin pellets 13, is carried to a centrifugal dehydration dryer 11, and the stretched dehydration dryer 11 separates the hot water 9 attached to the synthetic resin pellets 13. The The synthetic resin pellets 13 are conveyed to the vibrating sieve 12, and the separated hot water 9 is returned to the hot water tank 8. Thereafter, the synthetic resin pellets 13 are sorted according to size by the vibrating sieve 12 and accumulated.

FIG. 7 illustrates the configuration of the centrifugal dehydration dryer 11 shown in FIG. 6 and disclosed in Patent Document 1, and FIG. 8 explains the shape of the rotary blades used in the conventional centrifugal dehydration dryer. FIG. 10 is a cross-sectional view of a part of FIG.
The centrifugal dehydration dryer 11 has a structure in which a cylindrical outer cylinder 15 is installed on a base 14 in a vertical manner, and a motor 17 is connected via a motor housing 16 attached to the upper part of the outer cylinder 15. It is supported. A rotating body 18 that is rotationally driven by a motor 17 is installed inside the outer cylinder 14, and the output of the motor 17 is transmitted to a rotating shaft 20 of the rotating body 18 via a coupling 19. The rotating shaft 20 is installed vertically and supported by a bearing 21. In some cases, the belt is driven using a pulley. In some cases, a motor 17 may be installed in the lower part of the outer cylinder 15.
The rotating body 18 includes a rotating body 22 attached to a rotating shaft 20 and a plurality of plate-like rotating blades 23 arranged on the outer peripheral surface of the rotating body 22. Since each rotary blade 23 is attached with a rake angle 31 shown in FIG. 9 with respect to the rotation direction, it has an action of picking up and feeding the charged synthetic resin pellets 13 upward. The rake angle 31 is generally designed at about 45 degrees. Each rotary blade 23 is generally attached to the surface of the rotary body 22 in the normal (vertical) direction.
A cylindrical screen 24 is disposed between the outer cylinder 15 and the rotating body 18 so as to surround the rotary blade 23. The cylindrical screen 24 does not allow the synthetic resin pellets to pass through, but is set to a roughness that allows water to pass through.
A space formed between the rotary body 22 and the outer cylinder 15 is divided into an inner annular space 25 and an outer annular space 26 by a cylindrical screen. The inner annular space 25 is connected to the slurry supply port 27 at the lower end and to the pellet discharge port 29 at the upper end. Further, the outer annular space 26 is connected to the drain outlet 28 at the lower end portion and to the exhaust duct 30 at the intermediate portion.
The arrangement of the rotary blades 23 of the conventional centrifugal dehydrator 11 shown in FIG. 8 will be described. A plurality of rotary blades 23 are arranged on the outer peripheral surface of the rotary body 22, but generally the production cost is taken into consideration. The rotating blades 23 are arranged in the same shape and installation angle from the lower part of the rotary body 22 to the upper part, that is, from the lower part for dehydration to the middle part and the upper part for drying.

Next, the dehydration process of the conventional centrifugal dehydration dryer 11 shown in FIGS. 7 to 10 will be described.
The slurry 5, which is a mixture of the synthetic resin pellets 13 and the hot water 9 supplied from the slurry supply port 27, is supplied to the lower part of the inner annular space 25. At this time, in order to prevent the slurry supply port 27 from being clogged, a certain percentage of hot water 9 is contained in the slurry. The slurry 5 is scraped up by the rotating blades 23 of the rotating body 18 driven by the motor 17 and conveyed upward in the inner annular space 25. When the slurry 5 is conveyed upward, the synthetic resin pellets 13 collide with the cylindrical screen 24, and the hot water 9 adhering to the surface of the synthetic resin pellets 13 is separated by inertia force. The separated hot water 9 passes through the cylindrical screen 24 by the action of centrifugal force and scatters in the outer annular space 26. The scattered hot water 9 returns to the hot water tank 8 through the drain port 28.
The synthetic resin pellets 13 from which the hot water 9 has been separated from the slurry 5 are discharged from the pellet discharge port 29 and carried to the vibrating sieve 12, and the steam present in the outer annular space 26 and the inner annular space 25 is sent to a suction fan (not shown). It is discharged from the connected exhaust duct 30.

Japanese Patent No. 3677226

Since the conventional centrifugal dehydration dryer is configured as described above, the following problems exist.
That is, as shown in FIG. 7, the slurry 5 supplied to the centrifugal dehydration dryer 11 is picked up by the rotary blade 23 and conveyed. However, as described above, in order to prevent the slurry supply port 27 from being clogged, a certain percentage of hot water 9 is contained in the slurry. When being swept up and conveyed by the rotary blade 23, most of the hot water 9 contained in the slurry 5 passes through the cylindrical screen 24 and is discharged to the outer annular space 26 by the rotary blade 23. Has been swung upward together with the synthetic resin pellets 13 and discharged from the pellet discharge port 29.
In this case, in order to perform sufficient dehydration, it is necessary to dehydrate and dry the synthetic resin pellets 13 by staying in the centrifugal dehydration and drying 11 for a long time. Since the synthetic resin pellet 13 stays in the centrifugal dehydration dryer for a long time, the number of times the synthetic resin pellet 13 collides with the cylindrical screen 24 increases, and the hot water 9 attached to the synthetic resin pellet 13 is separated and discharged. This is because the amount to be increased. In addition, since the rotational speed of the rotary body 18 influences a centrifugal force, it is necessary to maintain sufficient rotational speed.
As described above, in order to obtain a sufficient residence time, it is necessary to increase the transport distance of the synthetic resin pellets 13 upward, resulting in a problem that the size of the centrifugal dehydration dryer 11 must be increased. .

  The present invention has been made to solve the above problems, and in particular, has a plurality of dewatering rotary blades and drying rotary blades on the outer periphery of the rotating body, and at least the dehydrating rotary blades are: An object of the present invention is to improve the dewatering and drying ability by arranging it at a predetermined inclination angle from the normal to the surface of the rotating body.

The centrifugal dehydration dryer for synthetic resin pellets according to the present invention is provided inside the outer cylinder and allows the passage of moisture and prevents the passage of resin pellets, and is provided rotatably inside the cylindrical screen. A rotary body having a plurality of dewatering rotary blades and a drying rotary blade on the surface of the rotary body, and the plurality of dewatering rotary blades are installed at a lowermost part on the surface of the rotary body, The drying rotary blade is provided above the dehydrating rotary blade , and the dehydrating rotary blade is disposed at a predetermined inclination angle with respect to the normal direction with respect to the surface of the rotary body, and the inclination angle is 15 The rotary blade for drying is provided in a normal direction with respect to the surface of the rotary body, and the rake angle is 20 to 40 degrees.
Further, the centrifugal dehydration drying method for synthetic resin pellets according to the present invention includes a cylindrical screen provided inside the outer cylinder that allows passage of moisture and prevents passage of resin pellets, and is rotatable freely inside the cylindrical screen. A rotating body having a plurality of dewatering rotating blades and drying rotating blades on the surface of the rotating body, and the plurality of dewatering rotating blades are installed at a lowermost part on the surface of the rotating body. The drying rotary blades are provided above the dehydrating rotary blades, and the dehydrating rotary blades are disposed at a predetermined inclination angle with respect to the normal direction to the surface of the rotating body and adhere to the resin pellets. And the inclination angle is 15 to 60 degrees, and the rotary rotor for drying is provided in a normal direction with respect to the surface of the rotary body. There angle is the way it is 20 to 40 degrees.

Since the centrifugal dehydration dryer for synthetic resin pellets and the dehydration drying method according to the present invention are configured as described above, the following effects can be obtained.
That is, a cylindrical screen provided on the inner side of the outer cylinder that allows passage of moisture and blocks passage of resin pellets, and a plurality of spins for dehydration provided on the surface of the rotary body that is rotatably provided on the inner side of the cylindrical screen. A plurality of dehydrating rotary blades installed at a lowermost portion on the surface of the rotating body, and the plurality of drying rotary vanes are more than the dehydrating rotary vanes. Synthetic resin pellets that are provided above and the dewatering rotary blades are arranged at a predetermined inclination angle from the normal direction to the surface of the rotating body, thereby separating more hot water from the slurry and less adhering hot water Can be conveyed above the inner annular space.
Moreover, since the dehydration drying capability has been improved, the size of the centrifugal dehydration dryer can be reduced with the same capability.
In addition, since the inclination angle is 15 to 60 degrees, by using a dewatering rotary blade having a high dewatering capacity, the amount of hot water to be separated is increased compared to a conventional rotary blade, The amount of hot water conveyed upward in the outer annular space can be reduced.
Moreover, the said rotary blade for drying is provided in a normal direction with respect to the surface of the rotary body, and the rake angle is 20 to 40 degrees, so that the synthetic resin pellets are compared with the conventional rotary blade. It can be dehydrated and dried for a long time in a centrifugal dehydration dryer.
Furthermore, by installing a rotary blade for dehydration and a rotary blade for drying, the dewatering and drying capacity is improved compared to conventional centrifugal dehydration dryers, and the amount of hot water attached to the synthetic resin pellets discharged from the pellet outlet Can be reduced as compared with the prior art.

It is a schematic block diagram of the centrifugal dehydration dryer for synthetic resin pellets by this invention. It is sectional drawing of the principal part of FIG. It is AA sectional drawing of FIG. It is sectional drawing of the principal part of FIG. It is AA sectional drawing of FIG. It is a schematic block diagram of the conventional granulation apparatus applied to this invention. FIG. 7 is an enlarged detailed cross-sectional view of a main part of FIG. 6. It is a general | schematic expanded block diagram of the principal part of FIG. It is sectional drawing of the principal part of FIG. It is AA sectional drawing of FIG.

  The present invention has a plurality of dewatering rotary blades and drying rotary blades on the outer periphery of the rotating body, and the dewatering rotating blades are disposed at a predetermined inclination angle with respect to the normal direction with respect to the surface of the rotating body. It is an object of the present invention to provide a centrifugal dewatering dryer for synthetic resin pellets and a method for dehydrating and drying the same so as to improve the drying ability.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a centrifugal dewatering dryer for synthetic resin pellets and a method for dehydrating and drying the same according to the present invention will be described with reference to the drawings.
The same or equivalent parts as those in the conventional example will be described using the same reference numerals, and the basic configuration of the granulation apparatus in FIG. 6 and the centrifugal dehydration dryer in FIG. Therefore, it shall be applied.
In FIG. 1, reference numeral 15 denotes an outer cylinder, and a cylindrical screen 24 is fixedly disposed inside the outer cylinder 15 via an outer annular space 26.

Inside the cylindrical screen 24, there is rotatably provided a rotating body 22 having a plurality of dewatering rotating blades 32 and a plurality of drying rotating blades 33 provided on the surface 22a of the rotating body.
An inner annular space 25 is formed at the outer peripheral position of the rotary body 22 as a space for rotating the rotary blades 32 and 33.
The rotary blades 32 and 33 provided on the rotary body surface 22a are provided with the dehydrating rotary blade 32 at the lowermost part, and the drying rotary blade 33 is provided at the center and the upper part thereof. Yes. The dehydrating rotary blade 32 is not limited to a single stage, and may be configured in two stages or three stages.

2 and 3 show the structure and arrangement of the dewatering rotary blade 32.
The dewatering rotary blade 32 is attached to the rotary body surface 22a of the rotary body 22, and the conventional dewatering rotary blade 32 is generally attached to the surface of the rotary body 22 in the normal (vertical) direction. The rotary blade 32 is installed at a position inclined by a predetermined inclination angle 34 from the normal (vertical) direction of the rotary body 22 to the rotary body surface 22a. At this time, the inclination angle 34 is designed in an optimal range of 15 to 60 degrees as a result of various experiments.
In addition, the rake angle 31 is attached at about 45 degrees like the conventional rotary blade.

Next, the configuration and operation of the dehydrating rotary blade 32 shown in FIGS. 2 and 3 will be described.
The slurry 5, which is a mixture of the synthetic resin pellets 13 and the hot water 9, is supplied from the slurry supply port 27 to the inner annular space 25 in the vicinity of the dewatering rotary blade 32. As described above, the slurry 5 contains a certain percentage of hot water 9 in order to prevent the slurry supply port 27 from being clogged.
The dehydrating rotary blades 32 are disposed at an inclination angle 32 from the normal to the rotating body surface 22 a, so that when the rotating body 18 and the dehydrating rotary vanes 32 are rotated in the slurry 5 by driving the motor 17, the inner ring shape is increased. Since the slurry in the space 25 starts to forcibly flow in the slurry flow direction 36 along the surface of the dewatering rotary blade 32, a flow is generated from the inner side through the cylindrical screen 24 toward the outer annular space 26. Therefore, when the dewatering rotary blade 32 is used as compared with the conventional rotary blade 23, the amount of hot water 9 to be dehydrated increases. When the dewatering rotary blade 32 is used in this way, the amount of the warm water 9 flowing out to the outer annular space 26 increases, and as a result, the amount of the warm water 9 that can scoop up the inner annular space 25 decreases.
As with the conventional rotary blade 23, the dehydrating rotary blade 32 is attached with a rake angle 31 with respect to the rotational direction, and therefore has the effect of picking up the synthetic resin pellet 13 that has been thrown upward and transporting it. have.

Next, FIGS. 4 and 5 show the structure and arrangement of the drying rotary blade 33.
The drying rotary blade 33 is attached to the rotary body surface 22a of the rotary body 22, and the conventional rotary blade 23 is designed with a rake angle 31 of about 45 degrees, but depending on the attachment state of the dehydrating rotary blade 32, The drying rotary blade 33 is installed with a rake angle 31 of 20 to 40 degrees.
In addition, it is attached to the normal (vertical) direction with respect to the rotary body surface 22a of the rotary body 22 like the conventional rotary blade.

Next, the operation of the drying rotary blade 33 shown in FIGS. 4 and 5 will be described.
In order to perform drying effectively, the synthetic resin pellets 13 need to stay in the centrifugal dehydration dryer 11 for a long time. However, the synthetic resin pellets 13 stay in the centrifugal dehydration dryer for a long time, so that a cylindrical screen is obtained. This is because the number of times of collision with 24 increases and the amount of hot water 9 attached to the synthetic resin pellets 13 is separated and discharged increases. In addition, since the rotational speed of the rotary body 18 influences a centrifugal force, it is necessary to maintain sufficient rotational speed.
Since the drying rotary blade 33 is installed at a rake angle 31 of 20 to 40 degrees, the rake angle is smaller than that of the conventional rotary blade 23 installed at a rake angle 31 of about 45 degrees. Therefore, the distance by which the synthetic resin pellets 13 are conveyed upward while the rotator 18 rotates once is shortened. Therefore, when the rotational speed of the rotating body 18 and the transport distance upward are the same, the dwelling rotary blade 33 has a longer residence time in the centrifugal dehydration dryer 11 than the conventional rotary vane 23. .
Therefore, by using the rotary blade 33 for drying, the synthetic resin pellet 13 can be dehydrated and dried in the centrifugal dehydration dryer 11 for a long time without reducing the centrifugal force as compared with the conventional rotary blade 23. It has become possible.

Next, an arrangement of the rotary blades of the centrifugal dehydration dryer 11 in which the rotary blades 32 for dehydration and the rotary blades 33 for drying shown in FIG.
1 to 3 rows of dewatering rotary blades 32 are arranged on the outer peripheral surface of the lowermost part of the rotating body 21 (the number of rows varies depending on the process) (FIG. 1 shows the case of one row). .
The drying rotary blades 33 are arranged in a plurality of rows circumferentially above the dehydrating rotary blades 32.

Next, the operation of the centrifugal dehydrator 11 shown in FIG. 1 will be described.
The slurry 5, which is a mixture of the synthetic resin pellets 13 and the hot water 9, is supplied from the slurry supply port 27 to the inner annular space 25 in the vicinity of the dehydrating rotary blade 32 installed at the lowermost part of the rotating body 18. As described above, in order to prevent the slurry supply port 27 from being clogged, a certain percentage of hot water 9 is included in the slurry.
Since the dewatering rotary blade 32 is disposed at an inclination angle 32 from the normal to the surface of the rotary body 22, when the rotary body 18 and the dehydrating rotary blade 32 rotate within the slurry 5 by driving the motor 17, the inner annular space Since the slurry No. 25 begins to forcibly flow in the slurry flow direction 36 along the surface of the dewatering rotary blade 32, a flow is generated from the inner side through the cylindrical screen 24 toward the outer annular space 26. Therefore, when the dewatering rotary blade 32 is used as compared with the conventional rotary blade 23, the amount of hot water 9 to be dehydrated increases. If the rotating blades 32 for dewatering are used in this way, the amount of dewatering to the outer annular space 26 is increased, and as a result, the amount of hot water 9 that can scoop up the inner annular space is reduced.
Further, as with the conventional rotary blade 23, the dehydrating rotary blade 32 is attached with a rake angle 31 with respect to the rotational direction, and therefore has the effect of picking up the synthetic resin pellets 13 fed upward and transporting them. Have.
As described above, the dewatering rotary blade 32 installed at the lower part of the rotary body 22 separates more hot water 9 from the slurry 5 and has less attached hot water 9 compared to the conventional rotary blade 23. The resin pellet 13 can be conveyed above the inner annular space 25.

The synthetic resin pellets 13 conveyed as described above are supplied in the vicinity of the drying rotary blades 33 arranged in a plurality of rows.
Since the rotary blade 33 for drying is installed at a rake angle 31 of 20 to 40 degrees, the rake angle is smaller than that of the conventional rotary blade 23 installed at a rake angle 31 of about 45 degrees. Therefore, the distance by which the synthetic resin pellets 13 are conveyed upward while the rotator 18 rotates once is shortened. Therefore, in the case of the same rotational speed of the rotating body 18 and the upward conveyance distance, the dwelling rotary blade 33 has a longer residence time in the centrifugal dehydration dryer 11 than the conventional rotary blade 23.
Therefore, by using the rotary blade 33 for drying, the synthetic resin pellet 13 can be dehydrated and dried in the centrifugal dehydration dryer 11 for a long time without reducing the centrifugal force as compared with the conventional rotary blade 23. It has become possible.
As described above, by installing the dehydrating rotary blade 32 and the drying rotary vane 33 as shown in FIG. 1, the dehydrating and drying capacity is higher than that of the conventional centrifugal dehydrating dryer 11 shown in FIGS. 7 and 8. As a result, the amount of hot water 9 attached to the synthetic resin pellets 13 discharged from the pellet outlet 29 could be reduced.
Further, since the dewatering / drying capacity has been improved, the size of the centrifugal dewatering / drying machine 11 can be reduced with the same capacity.
The actual operation of the present invention will be described below.
The synthetic resin raw material 1 supplied into the extruder 2 in FIG. 6 is melted in the extruder 2 and extruded from the die 3. The extruded molten synthetic resin is cut into a predetermined size in warm water by the underwater cutter 4, cooled and solidified by the warm water 9, and synthetic resin pellets 13 are generated.
The warm water 9 is stored in the warm water tank 8 and conveyed by the pump 7, and the slurry 5, which is a mixture of the synthetic resin pellets 13 and the warm water 9, is conveyed to the dehydrator 10 through the pipe 6.
Most of the hot water 9 is separated by the dehydrator 10 and returned to the hot water tank 8. On the other hand, the slurry 5, which is a mixture of a small amount of hot water 9 and the synthetic resin pellets 13, is conveyed to the centrifugal dehydration dryer 11. In the centrifugal dehydrator 11, the hot water 9 attached to the synthetic resin pellet 13 is separated. The synthetic resin pellets 13 are conveyed to the vibrating sieve 12, and the separated hot water 9 is returned to the hot water tank 8. Thereafter, the synthetic resin pellets 13 are separately collected by size using the vibrating sieve 12.

  As shown in FIG. 7, the centrifugal dehydration dryer 11 has a structure in which a cylindrical outer cylinder 15 is vertically installed on a base 14. A motor 17 is supported via a motor housing 16 attached to the upper portion of the outer cylinder 15. A rotating body 18 that is rotationally driven by a motor 17 is installed inside the outer cylinder 15, and the output of the motor 17 is transmitted to a rotating shaft 20 of the rotating body 18 through a coupling 19. The rotating shaft 20 is installed vertically and supported by a bearing 21. In some cases, the belt is driven using a pulley. In some cases, a motor 17 may be installed in the lower part of the outer cylinder 15.

The rotating body 18 includes a rotating body 22 attached to the rotating shaft 20, and a plurality of plate-like dewatering rotating blades 32 and a drying rotating blade 33 arranged on the outer peripheral surface of the rotating body 22.
On the outer peripheral surface of the lowermost part of the rotating body 21, the rotating blades 32 for dehydration are arranged in a circle in a circle (the number of rows varies depending on the process).
The dewatering rotary blade 32 is installed at a position inclined at an inclination angle 34 from the normal (vertical) direction to the surface of the rotary body 22. At this time, the inclination angle 34 is designed in the range of 15 to 60 degrees. In addition, the rake angle 31 is attached at about 45 degrees like the conventional rotary blade.
A plurality of rows of drying rotary blades 33 are arranged above the dewatering rotary blades 32, and the drying rotary blades 33 are installed with a rake angle 31 of 20 to 40 degrees. In addition, it attaches to the normal (vertical) direction with respect to the rotary body 22 surface like the conventional rotary blade.

A cylindrical screen 24 is disposed between the outer cylinder 15 and the rotating body 18 so as to surround the dewatering rotary blade 32 and the drying rotary blade 33. The cylindrical screen 24 does not allow the synthetic resin pellets to pass through, but is set to a roughness that allows water to pass through.
A space formed between the rotary body 22 and the outer cylinder 15 is divided into an inner annular space 25 and an outer annular space 26 by a cylindrical screen. The inner annular space 25 is connected to the slurry supply port 27 at the lower end and to the pellet discharge port 29 at the upper end. The outer peripheral ring 6 is connected to the drainage groove 28 at the lower end and to the exhaust duct 30 at the middle.

The slurry 5, which is a mixture of the synthetic resin pellets 13 and the hot water 9, is supplied from the slurry supply port 27 to the inner annular space 25 in the vicinity of the dehydrating rotary blade 32 installed at the lowermost part of the rotating body 18. In order to prevent clogging of the slurry supply port 27, a certain percentage of warm water 9 is contained in the slurry.
The dehydrating rotary blades 32 are disposed at an inclination angle of 32 from the normal to the surface of the rotating body 22 as described above, so that the rotating body 18 and the dehydrating rotary vanes 32 are driven into the slurry 5 by driving the motor 17. When rotating, the slurry in the inner annular space 25 starts to forcibly flow in the slurry flow direction 36 along the surface of the dewatering rotary blade 32, so that hot water passes from the inner side to the outer annular space 6 through the cylindrical screen 24. Nine flows occur. For this reason, the amount of hot water 9 discharged to the outer annular space 26 increases, and as a result, the amount of hot water 9 that can be scraped upward in the inner annular space decreases.
Further, the synthetic resin pellets 13 do not pass through the cylindrical screen 24 and are scraped upward by the dewatering rotary blades 32. The dehydrating rotary blade 32 is attached with a rake angle 31 with respect to the rotation direction, and thus has an action of picking up and feeding the charged synthetic resin pellets 13 upward.
As described above, the dehydrating rotary blade 32 installed at the lower portion of the rotating body 18 separates more hot water 9 from the slurry 5, and the synthetic resin pellet 13 with less attached hot water 9 is disposed above the inner annular space 25. Can be transported to.

As described above, the conveyed synthetic resin pellets 13 are supplied to the vicinity of the drying rotary blades 33 arranged in a plurality of rows, and the synthetic resin pellets 13 are further scraped up by the drying rotary blades 33 and conveyed upward. Is done.
When the synthetic resin pellet 13 is conveyed upward, the synthetic resin pellet 13 collides with the cylindrical screen 24, and the hot water 9 attached to the surface of the synthetic resin pellet 13 is separated by inertia force. The separated hot water 9 passes through the cylindrical screen 24 by the action of centrifugal force and scatters in the outer annular space 26. The scattered hot water 9 returns to the hot water tank 8 through the drain port 28.

At this time, the drying rotary blade 33 is installed with a rake angle 31 as small as 20 to 40 degrees, so that the distance that the synthetic resin pellet 13 is conveyed upward during one rotation of the rotating body 18 is shortened. Therefore, the residence time of the synthetic resin pellets 13 in the centrifugal dehydration dryer 11 is increased by using the rotary blades 33 for drying.
As a result, the synthetic resin pellets 13 are dehydrated and dried for a long time in the centrifugal dehydration dryer 11 by using the drying rotary blades 33.
The synthetic resin pellets 13 in which the hot water 9 is sufficiently separated from the slurry 5 and the amount of the hot water 9 adhering to the surface is reduced are discharged from the pellet discharge port 29 and conveyed to the vibrating sieve 12 to select the particle size.
Further, the steam existing in the outer annular space 26 and the inner annular space 25 is discharged from an exhaust duct 30 connected to a suction fan (not shown).

  The centrifugal dehydration dryer for synthetic resin pellets and the drying method thereof according to the present invention include a dehydrating rotary blade and a drying rotary blade provided on the rotary body, wherein the dehydrating rotary blade has a predetermined inclination from the normal to the surface of the rotary body. By arranging at an angle, the efficiency of dehydration / drying can be improved and the apparatus can be downsized.

DESCRIPTION OF SYMBOLS 1 Synthetic resin raw material 2 Extruder 3 Dies 4 Submersible cutter 5 Slurry 6 Piping 7 Pump 8 Hot water tank 9 Hot water 10 Dehydrator 11 Centrifugal dehydrator 12 Vibrating sieve 13 Synthetic resin pellet 14 Base 15 Outer cylinder 16 Motor housing 17 Motor 18 Rotating body 19 Coupling 20 Rotating shaft 21 Bearing 22 Rotating body 23 Rotating blade 24 Cylindrical screen 25 Inner annular space 26 Outer annular space 27 Slurry supply port 28 Drain port 29 Pellet outlet 30 Exhaust duct 31 Rake angle 32 Rotating blade for dehydration 33 Rotary blade for drying 34 Inclination angle 35 Height of rotary blade 36 Slurry flow direction

Claims (6)

A cylindrical screen (24) provided inside the outer cylinder (15) that allows passage of moisture and prevents passage of resin pellets, and a rotating body surface that is rotatably provided inside the cylindrical screen (24) (22a) each having a plurality of dewatering rotary blades (32) and a rotary body (22) having a drying rotary blade (33),
The plurality of dewatering rotary blades (32) are installed at the lowermost part on the surface of the rotary body (22a), and the plurality of drying rotary blades (33) are provided above the dewatering rotary blades (32). The centrifugal dewatering dryer for synthetic resin pellets , wherein the dewatering rotary blade (32) is disposed at a predetermined inclination angle (34) from a normal direction to the rotating body surface (22a).   The centrifugal dehydration dryer for synthetic resin pellets according to claim 1, wherein the inclination angle (34) is 15 to 60 degrees.   The said rotary blade (33) for drying is provided in the normal line direction with respect to the said rotary body surface (22a), and the rake angle (31) is 20-40 degree | times, The characterized by the above-mentioned. 2. Centrifugal dehydration dryer for synthetic resin pellets. A cylindrical screen (24) provided inside the outer cylinder (15) that allows passage of moisture and prevents passage of resin pellets, and a rotating body surface that is rotatably provided inside the cylindrical screen (24) (22a) each having a plurality of dewatering rotary blades (32) and a rotary body (22) having a drying rotary blade (33),
The plurality of dewatering rotary blades (32) are installed at the lowermost part on the surface of the rotary body (22a), and the plurality of drying rotary blades (33) are provided above the dewatering rotary blades (32). The dehydrating rotary blade (32) is disposed at a predetermined inclination angle (34) from the normal direction to the rotating body surface (22a) to dehydrate moisture adhering to the resin pellets. A centrifugal dehydration drying method for synthetic resin pellets.   5. The centrifugal dehydration drying method for synthetic resin pellets according to claim 4, wherein the inclination angle (34) is 15 to 60 degrees.   The said drying rotary blade (33) is provided in a normal line direction with respect to the said rotary body surface (22a), and the rake angle (31) is 20 to 40 degrees. 5. The method of centrifugal dehydration and drying for synthetic resin pellets according to 5.

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