JP2000256980A - Pulp-treating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pulp-treating apparatus capable of sufficiently carrying out treatment of pulp by improving treating efficiency in screening. SOLUTION: A rectifying member 31 is provided in close to a pulp feed port 5 above the pulp feed port 5 in a pulp inlet part 3. The rectifying member 31 has a pulp feed port opposing part 32 formed in conical shape and a part 33 formed in spherical surface-like shape. In the rectifying member 31, a pulp feed port opposing part 32 is installed in the pulp inlet part 3 so that the center of a pulp feed port 5 is located on extension of axial line of cone in a state opposed to the pulp feed port 5. The attachment of the rectifying member 31 to the pulp inlet part 3 is carried out by three supporting members 34 extending to diameter direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulp processing apparatus used in a processing stage such as pulp washing or bleaching.

[0002]

2. Description of the Related Art A pulp processing apparatus of this type is known, for example, as disclosed in Japanese Patent Application Laid-Open No. 2-191789. The pulp processing apparatus has a casing in which a portion in the vicinity of the top is formed in a cylindrical shape and whose axial center is provided in a vertical direction. A pulp for supplying pulp into the casing has an opening area at a center position of the bottom of the casing, which is smaller than an opening area of a portion near the top formed in a cylindrical shape and orthogonal to the axial direction of the casing. The supply port is provided to open in the axial direction of the casing. The casing and the casing are coaxially multiplexed and arranged inside the vicinity of the top formed in a cylindrical shape, and are formed in a hollow shape so as to communicate the inside formed in the hollow and the inside of the casing. A plurality of cylindrical screen rings having a plurality of holes and different diameters are provided. The plurality of screen rings are moved up and down integrally in the axial direction of the casing by the screen ring moving means. In such a configuration, in the pulp processing apparatus, the processing liquid is supplied between the screen rings, and when the screen ring moves upward, the liquid that has been replaced with the processing liquid and that has flowed into the inside of the screen ring through the hole is removed. The pulp to which the processing liquid has been supplied is discharged to the outside of the casing while being discharged to the outside of the casing.

[0003]

SUMMARY OF THE INVENTION The present invention provides a pulp processing apparatus as described above, in which pulp processing can be sufficiently performed by improving the processing efficiency by screen ring in the pulp processing apparatus as described above. That is the task.

[0004]

As a result of the investigation and research by the present inventors, the following facts have been newly found. In the pulp processing apparatus as described above, the pulp supply port may be provided to be opened at the center of the bottom of the casing, and the speed of the pulp ascending in the center near the axis of the casing may be increased. It is about 5 to 15 percent faster than the speed of the pulp rising up the outer periphery. Usually, since the upward moving speed of the screen ring is set in accordance with the average speed of the pulp in a plane orthogonal to the axial direction of the casing,
It was found that the replacement time of the pulp rising in the center of the casing with the treatment liquid was shorter than a desired time, and that processing such as washing with a screen ring located in the center of the casing was not sufficiently performed. Also, with regard to the pulp which rises in the outer peripheral portion in the casing, the replacement time by the treatment liquid is longer than a desired time. It was also found that liquid from the pulp was less likely to flow into the arm through the hole, and that processing such as washing with a screen ring located on the outer peripheral portion in the casing was not sufficiently performed.

For this reason, in the first aspect, at least a portion near the top is formed in a cylindrical shape, and the axial direction of the casing is provided in the vertical direction. Pulp for supplying pulp into the casing, having an opening area smaller than the opening area of a portion near the top formed in a cylindrical shape and orthogonal to the axial direction of the casing, and The supply port and the casing and the casing are coaxially multiplexed and arranged inside the vicinity of the top formed in a cylindrical shape, and are formed in a hollow shape so as to communicate the hollow formed interior with the casing interior. A plurality of screen rings formed in a cylindrical shape having a plurality of holes and having different diameters from each other; Screen ring moving means for moving the screen ring up and down, supplying a processing liquid between the screen rings, and casing the liquid flowing into the screen ring from the hole when the screen ring moves upward. A pulp processing apparatus for discharging pulp supplied with a processing liquid to the outside of the casing while discharging the pulp to the outside of the casing, wherein the pulp supplied into the casing from the pulp supply port is in the vicinity of a screen ring in a radial direction of the casing. Is characterized by comprising a rectifying means for rectifying the pulp ascending in the casing so that the velocity components parallel to the axial direction of the casing of the pulp are substantially the same.

When such a configuration is adopted, the velocity components parallel to the axial direction of the pulp casing in the radial direction of the casing become substantially the same by the rectifying means. For this reason, the relative speed between the pulp and the screen ring that rises in the casing is substantially the same between the screen ring located at the outer peripheral portion in the casing and the screen ring located at the center of the casing, and the screen ring relative to the pulp in each screen ring. The replacement time with the processing solution can be a desired optimum time. Therefore, the processing efficiency by the screen ring can be improved, and the pulp can be sufficiently processed.

The present inventors have also newly found the following facts. Pulp treatment efficiency is also related to the mass of fiber passing per screen ring surface area (filtration area), and decreases as the mass of fiber passing per screen ring surface area (filtration area) increases.
The main flow of pulp supplied from the pulp supply port rises in the center of the casing and is not sufficiently diffused to the outer periphery in the casing, so the mass of fibrous material per unit volume of pulp rising in the center of the casing Is larger than the mass of fibrous material contained per unit volume of pulp rising on the outer peripheral portion in the casing. Therefore, the processing efficiency of the screen ring located at the center of the casing is lower than the processing efficiency of the screen ring located at the outer peripheral portion in the casing. For this reason, the surface area of the screen ring located at the center of the casing may be smaller than the surface area of the screen ring located at the outer periphery in the casing,
It has been found that there is a problem that the processing in the screen ring located in the center of the casing is not sufficiently performed as compared with the processing in the screen ring located in the outer peripheral portion in the casing.

For this reason, in the pulp processing apparatus according to the present invention, the pulp supplied into the casing from the pulp supply port is located near the screen ring and in a plane orthogonal to the axial direction of the casing. The pulp is characterized by comprising a rectifying means for rectifying the pulp rising in the casing so that the mass of the fibrous material contained per unit volume in the pulp is substantially uniform.

When such a configuration is adopted, the mass of the fibrous material contained per unit volume in the pulp becomes substantially the same in a plane orthogonal to the axial direction of the casing by the rectifying means. For this reason, the mass of the fibrous material passing per surface area of the screen ring can be reduced in the central portion of the casing and increased in the outer peripheral portion in the casing, as compared with the case without the straightening means. Can be. Therefore, the processing efficiency by the screen ring can be improved, and the pulp can be sufficiently processed.

According to a third aspect of the present invention, there is provided a pulp treating apparatus as described above, which solves both the problem relating to the pulp rising speed and the problem relating to the mass of fibrous material. In the vicinity of the screen ring, the supplied pulp has substantially the same velocity component parallel to the axial direction of the casing of the pulp in the radial direction of the casing, and the unit in the pulp in a plane orthogonal to the axial direction of the casing. It is characterized by having rectifying means for rectifying pulp rising in the casing so that the mass of fibrous material contained per volume becomes substantially uniform.

When such a configuration is adopted, the velocity components parallel to the axial direction of the pulp casing in the radial direction of the casing are substantially the same by the rectifying means. For this reason, the relative speed between the pulp and the screen ring that rises in the casing is substantially the same between the screen ring located at the outer peripheral portion in the casing and the screen ring located at the center of the casing, and the screen ring relative to the pulp in each screen ring. The replacement time with the processing solution can be a desired optimum time. In addition, the mass of the fibrous material contained per unit volume in the pulp is substantially the same in a plane orthogonal to the axial direction of the casing. For this reason, the mass of the fibrous material passing per surface area of the screen ring can be reduced in the central portion of the casing and increased in the outer peripheral portion in the casing, as compared with the case without the straightening means. Can be. Therefore, the processing efficiency by the screen ring can be improved, and the pulp can be sufficiently processed.

Further, the rectifying means is provided in the vicinity of the pulp supply port and in front of the pulp supplied from the pulp supply port in the inflow direction of the pulp supplied thereto, facing the pulp supply port. It is preferable to have an opposing surface that deflects the flow direction to the outer peripheral portion in the casing.
When such a configuration is employed, the flow of pulp while the velocity component parallel to the axial direction of the casing is large just supplied from the pulp supply port due to the facing surface of the rectifying means provided near the pulp supply port. Since the direction can be deflected to the outer peripheral portion in the casing, the pulp can be dispersed on the outer peripheral portion in the casing. Thereafter, while the pulp is rising, the pulp is also diffused toward the center of the casing. Therefore, with a simple structure, the pulp supplied into the casing from the pulp supply port is substantially the same in velocity component parallel to the axial direction of the casing that the fibrous material has in the radial direction of the casing near the screen ring. Or the mass of fibrous material contained per unit volume in the pulp can be made substantially the same in a plane perpendicular to the axial direction of the casing.

Further, the opposed surface is formed in a conical shape having a taper angle substantially equal to a taper angle of the casing portion formed in the conical shape and a conical axis line substantially coinciding with an opening center of the pulp supply port. Is preferred. When such a configuration is adopted, the conical opposing surface and the conical casing portion keep the streamline direction of the pulp supplied from the pulp supply port constant so that the outer peripheral portion in the casing is formed. And the pulp flow direction can be more stably deflected to the outer peripheral portion in the casing.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view showing an embodiment of a pulp processing apparatus according to the present invention, FIG. 2 is a longitudinal sectional view of a main part near a pulp inlet, FIG. 3 is a sectional view taken along line III-III of FIG.
FIG. 4 is a partial perspective view showing a connection relationship between the arm and the screen ring.

The pulp processing apparatus 1 includes a substantially upright casing 2 having a pulp inlet 3 and a pulp outlet 4. The pulp inlet 3 is provided at the bottom of the casing 2 and has a pulp supply port 5 for supplying pulp into the casing 2. In the casing 2, a portion near the top is formed in a cylindrical shape, and a portion from an opening portion of the pulp supply port 5 to a portion near the top formed in a cylindrical shape is formed in a conical shape having a predetermined taper angle. . The pulp supply port 5 is provided so as to open at the center of the bottom of the casing 2, and the opening area is also smaller than the opening area on the surface orthogonal to the axial direction of the casing 2 near the top formed in a cylindrical shape. Has been made smaller. The pulp inlet 3 provided at the bottom of the casing 2 is formed in a conical shape with the pulp supply port 5 formed in a substantially perfect circle as a minimum diameter portion.
The taper angle of the pulp inlet portion 3 formed in a conical shape is approximately 3
It is set to 6 °. The diameter of the pulp supply port 5 is approximately 60
It is set to 0 mm. Pulp is from pulp supply port 5 to 2
It is supplied into the casing 2 at a speed of ３3 m / s. The pulp outlet 4 is provided at the top of the casing 2 and has an outlet pipe 6 mounted adjacent to the casing 2.
After being introduced from the pulp supply port 5, the pulp flows vertically in the casing 2 and is discharged from the outlet pipe 6.

In the casing 2 which is a portion near the top formed in a cylindrical shape, six arms 7 extending substantially in the radial direction are provided. The arm 7 is formed in a hollow shape. The arm 7 is provided with a plurality of cylindrical screen rings 8 arranged concentrically with the casing 2 and formed in cylindrical shapes having mutually different diameters.
Each screen ring 8 has an inner peripheral surface 9 and an outer peripheral surface 10, and the hollow portion 1 formed between the inner peripheral surface 9 and the outer peripheral surface 10.
1 is a plurality of holes 1 formed in the inner peripheral surface 9 and the outer peripheral surface 10
It is configured so as to communicate with the inside of the casing 2 through the second housing 2. The diameter of the hole 12 is generally about 1.6 mm, and the opening ratio of the inner peripheral surface 9 and the outer peripheral surface 10 is approximately 6%. At the radially outer end of each arm 7, a driving means 13 for moving each arm 7 in the vertical direction is provided as a screen ring moving means. Drive means 13
Has a support shaft 14 that supports the arm 7 and an actuator 15 that moves the support shaft 14 in the vertical direction. By the driving means 13, each screen ring 8 moves upward at a speed equal to or faster than the speed of the pulp passing between the screen rings 8 by a predetermined speed, and moves downward at a speed higher than the rising speed. The space in the arm 7 communicates with the discharge pipe 16. The hollow portion 11 in the screen ring 8 communicates with a space in the arm 7 at a portion where the screen ring 8 is attached to the arm 7.

A rotary arm structure 17 is attached to the upper portion inside the casing 2. This rotating arm structure 17 includes a plurality of rotating arms 18. The rotating arm structure 17 is connected via a rotating shaft 20 to a motor 19 provided outside the casing 2. Rotating shaft 20
The rotation arm 18 is formed in a hollow shape, and a processing liquid from a processing liquid supply unit (not shown) is supplied to the rotation shaft 20 so that a processing liquid such as a cleaning liquid is supplied from the rotation shaft 20 to each rotation arm 18. The supply passage 21 is connected.

The rotating arm 18 has a screen ring 8
The nozzle 22 is attached so that the tip is located between the nozzles. At the tip of the nozzle 22, an inlet 23 for introducing the processing liquid supplied from the processing liquid supply means via the rotating shaft 20 and the rotating arm 18 is provided. An opening is provided rearward in the rotation direction at a position on the rear side in the rotation direction. The processing liquid is continuously supplied from the processing liquid supply means in an amount corresponding to the amount of pulp passing between the screen rings 8. The rotary arm 18 is provided with a scraper blade for discharging the pulp through the outlet pipe 6 when the pulp reaches the top of the casing 2. The scraper blade includes a scraper blade 24 provided above the screen ring 8 and an end scraper blade 25 provided in a peripheral groove 26 at the top of the casing 2. The outlet pipe 6 is provided to extend downward from the peripheral groove 26.

A rectifying member 31 as rectifying means is provided at the pulp inlet 3 above the pulp supply port 5 and close to the pulp supply port 5. The flow regulating member 31 has a pulp supply port facing portion 32 formed in a conical shape and a portion 33 formed in a spherical shape. The rectifying member 31 is attached to the pulp inlet portion 3 such that the center of the pulp supply port 5 is located on the extension of the axis of the cone in a state where the pulp supply port facing portion 32 faces the pulp supply port 5. Rectifying member 31
Is attached to the pulp inlet portion by three support members 34 extending in the radial direction. Pulp supply port facing part 32
The taper angle is set to approximately 36 °, which is the same as the taper angle of the pulp inlet 3, and the cone length is set to approximately 1000 mm. Further, the conical surface of the pulp supply port facing portion 32 and the pulp inlet portion 3
Is set to about 400 mm. The interval between the conical surface of the pulp supply port facing portion 32 and the conical surface of the pulp inlet portion 3 is desirably set within a range that does not cause resistance to pulp supplied from the pulp supply port.

In the pulp processing apparatus 1 configured as described above, pulp having a desired viscosity is supplied into the casing 2 from the pulp supply port 5 and rises in the casing 2 toward the screen ring 8 so that the pulp has a vertical direction. Pass between the screen rings 8 that are moving. Liquid from the pulp is applied to the inner peripheral surface 9 of the screen ring 8 as shown in FIG.
And flows into the screen ring 8 through the hole 12 formed in the outer peripheral surface 10. The liquid that has flowed into the screen ring 8 is discharged from the discharge pipe 16 via the arm 7. At this time, since the processing liquid is continuously supplied to the pulp existing between the screen rings 8 from the opening of the nozzle 22, the liquid from the pulp and the processing liquid are eventually replaced. Become.

The pulp which has been replaced with the processing liquid by the screen ring 8 is caught by the rotating scraper blade 24 and flows into the peripheral groove 26. Peripheral groove 2
The pulp flowing into the end scraper blade 2
5 pushes out the peripheral groove 26 into the discharge pipe and is discharged. When the screen ring 8 reaches the upper end of the movement, the screen ring is quickly moved downward by the actuator 15. At this time, the processing liquid supply means (not shown)
By pressing and supplying the processing liquid to the screen ring 8 via the arm 7, the inner peripheral surface 9 and the outer peripheral surface 10 of the screen ring 8 are backwashed, and
The hole 12 formed in the inner peripheral surface 9 and the outer peripheral surface 10 is prevented from being clogged.

Further, by providing the rectifying member 31,
The pulp inlet portion 3 facing the pulp supply port facing portion 32 and the pulp supply port facing portion 32 form a passage portion 35 having a predetermined length facing the outer peripheral portion in the casing 2. The streamline direction of the pulp thus obtained can be fixed and directed toward the outer peripheral portion in the casing 2, and the pulp flow direction can be more stably deflected toward the outer peripheral portion in the casing 2. In addition, since the rectifying member 31 is provided close to the pulp supply port 5, the flow direction of the pulp is changed while the velocity component parallel to the axial direction of the casing 2 is large just supplied from the pulp supply port 5. 2 can be deflected to the outer periphery. From these, first, the pulp supplied from the pulp supply port 5 can be reliably dispersed on the outer peripheral portion in the casing 2.

The setting of the shape and the mounting position of the rectifying member 31 as described above and the function of the rectifying member 31 for deflecting the flow direction of the pulp to the outer peripheral portion in the casing 2 combine with the pulp supply port 5. In the vicinity of the screen ring 8, the pulp supplied into the casing 2 from the pulp is obtained as a velocity component parallel to the axial direction of the casing 2 of the pulp in the radial direction of the casing 2. When the pulp reaches the screen ring 8, the relative speed between the pulp rising in the casing 2 and the screen ring 8 is located at the center of the screen ring 8 located at the outer peripheral portion of the casing 2 and the center of the casing 2. The screen ring 8 is substantially the same, and the replacement time of the pulp with the processing liquid in each screen ring 8 can be set to a desired optimum time.

Further, since the rectifying member 31 is provided close to the pulp supply port 5, the pulp also diffuses toward the center of the casing 2 as it rises. The pulp supplied into the casing 2 from the casing 2 near the screen ring 8
And the mass of fibrous material contained per unit volume in the pulp in a plane orthogonal to the axial direction of the pulp is obtained as substantially the same. When the pulp reaches the screen ring 8, the mass of fibrous material passing per surface area of the screen ring 8 is reduced at the center of the casing 2 as compared with the case where the pulp does not have the flow regulating member 31. Can be increased at the outer peripheral portion in the casing 2. For this reason, it is possible to effectively use the screen ring 8 having a large surface area located on the outer peripheral portion in the casing 2.

In order for the pulp supplied from the pulp supply port 5 to make the velocity components parallel to the axial direction of the pulp casing 2 in the radial direction of the casing 2 near the screen ring 8, the casing 2 It is conceivable to provide a wire mesh having a substantially uniform resistance coefficient as a rectifying means between the pulp inlet portion 3 and the screen ring 8 in the inside. However, in this case, the mass of the fibrous material contained per unit volume in the pulp does not always become substantially the same in the plane orthogonal to the axial direction of the casing 2 near the screen ring 8. In order to make the mass of fibrous material per unit volume in the pulp substantially the same in the plane orthogonal to the axial direction of the casing 2 in the vicinity of the screen ring 8, the rectifying means should be provided close to the pulp supply port 5. Preferably, the pulp (fibrous material) is diffused in the radial direction of the casing 2 as the pulp rises toward the screen ring 8. Further, in the case of providing a wire mesh, there is a possibility that problems such as clogging due to adhesion of pulp to the mesh may occur,
It is not a realistic structure because it requires regular maintenance such as wire mesh cleaning.

Since the surface of the flow regulating member 31 facing the pulp supply port 5 is formed in a conical shape, it does not have much resistance to the flow of pulp supplied from the pulp supply port 5. Further, there is no problem that the pulp is clogged as in the case where the wire mesh is used as the rectifying member.

From the above, in this embodiment,
With a simple configuration in which the rectifying member 31 is provided above and near the pulp supply port 5, the processing efficiency of the screen ring 8 can be improved, and the pulp can be sufficiently processed. In addition, it is possible to increase the supply amount of pulp supplied from the pulp supply port 5 into the casing 2 per unit time, thereby increasing the pulp processing capacity. It has been confirmed that in the pulp processing apparatus having the above-described configuration, the pulp processing capacity can be increased by 10 to 20% or more, and the cleaning effect can be increased by 10 to 15% or more.

FIGS. 5 to 7 show modified examples of the rectifying member in the pulp processing apparatus according to the embodiment of the present invention.
5, the portion of the flow regulating member 41 facing the pulp supply port is formed in a conical shape having a taper angle larger than the taper angle of the pulp inlet portion. In FIG. 6, the rectifying member 51 is a disk-shaped member, and in FIG. 7, the rectifying member 61 is a spherical member.

Compared to the one shown in FIG. 1, in the modified examples shown in FIGS. 5 to 7, pulp of a predetermined length flows between the rectifying members 41, 51, 61 and the pulp inlet 3. Since the passage portion is not formed, the streamline direction of the pulp supplied from the pulp supply port 5 can be fixed and directed toward the outer peripheral portion in the casing 2, and the flow direction of the pulp can be more stably formed in the casing 2. The effect of being able to deflect to the outer periphery cannot be expected so much. However, each of the flow regulating members 41, 51, 61 has an opposing surface facing the pulp supply port 5 near the pulp supply port 5 and in front of the pulp supplied from the pulp supply port 5 in the inflow direction. Since the flow direction of the pulp can be deflected to the outer peripheral portion in the casing 2 while the velocity component parallel to the axial direction of the casing 2 is large just after being supplied from the port 5, the pulp is dispersed in the outer peripheral portion in the casing 2. Can be. Further, since the pulp is provided close to the pulp supply port 5, the pulp is also diffused toward the center of the casing 2 while the pulp is rising, and the pulp supplied into the casing 2 from the pulp supply port 5. By the time it reaches the screen ring 8, the velocity components parallel to the axial direction of the casing 2 of the fibrous material in the radial direction of the casing 2 become substantially the same, and in the plane orthogonal to the axial direction of the casing 2. It is possible to make the mass of fibrous material contained per unit volume in the pulp substantially the same.

In the present embodiment, as the rectifying member,
The pulp supplied into the casing from the pulp supply port is substantially the same in the radial direction of the casing as the velocity component parallel to the axial direction of the casing of the pulp in the vicinity of the screen ring, and is orthogonal to the axial direction of the casing. A rectifying pulp ascending in the casing is used so that the mass of the fibrous material contained per unit volume in the pulp in the plane is substantially uniform, but has one of the functions. Is also good. For example, pulp supplied into the casing from the pulp supply port rises in the casing such that the velocity components parallel to the axial direction of the pulp casing in the radial direction of the casing are substantially the same in the vicinity of the screen ring. The pulp supplied into the casing from the pulp supply port may be included in a unit perpendicular to the axial direction of the casing per unit volume in the pulp in the vicinity of the screen ring. It may be a rectifying member for rectifying the pulp rising in the casing so that the mass of the fibrous material to be made is substantially uniform.

In addition to the modified examples shown in FIGS. 5 to 7, the pulp supply port is provided near the pulp supply port and in front of the pulp supplied from the pulp supply port in the inflow direction of the pulp. As long as the member has an opposing surface that deflects the flow direction of the supplied pulp to the outer peripheral portion in the casing, members having various shapes such as a columnar member, a cubic member, and the like can be adopted as the rectifying member. It is.

[0032]

As described in detail above, it is possible to provide a pulp processing apparatus capable of sufficiently processing pulp by improving the processing efficiency in screening.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing an embodiment of a pulp processing apparatus according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part near a pulp inlet in an embodiment of the pulp processing apparatus according to the present invention.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a partial perspective view showing a connection relationship between an arm and a screen ring in the embodiment of the pulp processing apparatus according to the present invention.

FIG. 5 is a vertical sectional view of a main part near a pulp inlet, showing a modification of the straightening member in the embodiment of the pulp processing apparatus according to the present invention.

FIG. 6 is a vertical cross-sectional view of a main part near a pulp inlet, showing a modification of the straightening member in the embodiment of the pulp processing apparatus according to the present invention.

FIG. 7 is a vertical sectional view of a main part near a pulp inlet, showing a modification of the straightening member in the embodiment of the pulp processing apparatus according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pulp processing apparatus, 2 ... Casing, 3 ... Pulp inlet part, 4 ... Pulp outlet part, 5 ... Pulp supply port, 8 ... Screen ring, 11 ... Hole part, 13 ... Drive means, 22 ... Nozzle, 31, 41 , 51, 61 ... rectifying member, 32 ... pulp supply port facing part.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuo Hatano 5-14 Nihonbashi Hakozakicho, Chuo-ku, Tokyo Sumitomo Ahlstrom Co., Ltd. (72) Inventor Nobukatsu Kato 2-1-1 Mukaihama, Akita City, Akita Prefecture Tohoku (72) Inventor Kiyoshi Tsutsui 2-1-1 Mukaihama, Akita-shi, Akita F-term (reference) 4L055 CB03 CB07 FA22

Claims (5)

[Claims] 1. A casing having at least a portion in the vicinity of a top portion formed in a cylindrical shape and having an axial direction perpendicular to the casing, and an opening at a center position of a bottom portion of the casing toward an axial direction of the casing. A pulp supply port for supplying pulp into the casing, having an opening area smaller than an opening area of a portion near the top formed in the cylindrical shape and orthogonal to the axial direction of the casing; The casing and the casing are coaxially multiplexed and arranged inside the vicinity of the top formed in a cylindrical shape, and are formed in a hollow shape so as to communicate the interior formed in the hollow and the interior of the casing. A plurality of cylindrical screen rings having a plurality of holes formed and having different diameters from each other; Screen ring moving means for vertically moving the casing in the axial direction of the casing, supplying a processing liquid between the screen rings, and moving the screen ring from the hole when the screen ring moves upward. A pulp processing device that discharges the liquid flowing into the inside of the casing to the outside of the casing while discharging the pulp supplied with the treatment liquid to the outside of the casing, wherein the pulp is supplied into the casing from the pulp supply port. Rectifying means for rectifying the pulp ascending in the casing so that the velocity component of the pulp in the radial direction of the casing in the radial direction of the casing is substantially the same in the vicinity of the screen ring, A pulp processing apparatus comprising: 2. A casing having at least a portion in the vicinity of a top portion formed in a cylindrical shape and having an axial direction set in a vertical direction, and an opening at a center position of a bottom portion of the casing toward an axial direction of the casing. A pulp supply port for supplying pulp into the casing, having an opening area smaller than an opening area of a portion near the top formed in the cylindrical shape and orthogonal to the axial direction of the casing; The casing and the casing are coaxially multiplexed and arranged inside the vicinity of the top formed in a cylindrical shape, and are formed in a hollow shape so as to communicate the interior formed in the hollow and the interior of the casing. A plurality of cylindrical screen rings having a plurality of holes formed and having different diameters from each other; Screen ring moving means for vertically moving the casing in the axial direction of the casing, supplying a processing liquid between the screen rings, and moving the screen ring from the hole when the screen ring moves upward. A pulp processing device that discharges the liquid flowing into the inside of the casing to the outside of the casing while discharging the pulp supplied with the treatment liquid to the outside of the casing, wherein the pulp is supplied into the casing from the pulp supply port. Pulp in the vicinity of the screen ring, the pulp rising in the casing so that the mass of fibrous material contained per unit volume in the pulp is substantially uniform in a plane perpendicular to the axial direction of the casing. A pulp processing apparatus comprising a rectifying unit for rectifying the pulp. 3. A casing having at least a portion in the vicinity of a top portion formed in a cylindrical shape and having an axial direction extending in a vertical direction, and an opening at a center position of a bottom portion of the casing toward an axial direction of the casing. A pulp supply port for supplying pulp into the casing, having an opening area smaller than an opening area of a portion near the top formed in the cylindrical shape and orthogonal to the axial direction of the casing; The casing and the casing are coaxially multiplexed and arranged inside the vicinity of the top formed in a cylindrical shape, and are formed in a hollow shape so as to communicate the interior formed in the hollow and the interior of the casing. A plurality of cylindrical screen rings having a plurality of holes formed and having different diameters from each other; Screen ring moving means for vertically moving the casing in the axial direction of the casing, supplying a processing liquid between the screen rings, and moving the screen ring from the hole when the screen ring moves upward. A pulp processing device that discharges the liquid flowing into the inside of the casing to the outside of the casing while discharging the pulp supplied with the treatment liquid to the outside of the casing, wherein the pulp is supplied into the casing from the pulp supply port. In the vicinity of the screen ring, the velocity component parallel to the axial direction of the casing of the pulp in the radial direction of the casing is substantially the same, and the pulp in the pulp is in a plane orthogonal to the axial direction of the casing. Pulp rising in the casing so that the mass of fibrous material contained per unit volume of the pulp is substantially uniform Pulp processing device characterized by comprising a rectifying means for rectifying. 4. The rectifying means is provided in the vicinity of the pulp supply port and in front of the pulp supplied from the pulp supply port in the inflow direction of the pulp supplied thereto, facing the pulp supply port. The pulp processing apparatus according to any one of claims 1 to 3, further comprising an opposing surface that deflects a flow direction to an outer peripheral portion in the casing. 5. The opposing surface is formed in a conical shape having a taper angle substantially equal to a taper angle of the conically formed casing portion and a conical axis substantially coinciding with an opening center of the pulp supply port. 5. The method according to claim 4, wherein
A pulp processing apparatus according to item 1.