JP2003193383A - Pulper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact pulper in which energy consumption is slight and homogeneous paper stock slurry is continuously obtained and a foreign matter is scarcely micronized. <P>SOLUTION: This pulper produces paper stock slurry by using a waste paper such as a magazine as a paper stock, adding water and a chemical for promoting defiberization thereto and defiberizing the paper stock. The pulper is equipped with a vertical rotating shaft 2 on the nearly vertical center line of a vertical cylindrical container 1 having a paper stock feed port 7 in the upper part and having a take out port 8 of the paper stock slurry in the lower part. Agitating blades 4 are arranged in a multistage on a vertical rotating shaft 2 and a spiral screw blade 3 inducing the paper stock to the downward direction is installed in the upper part of the vertical rotating shaft 2. An auger- shaped discharge means 6 for sending out the paper stock slurry is installed in the output port 8. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulper for making a stock slurry by disaggregating stock such as waste paper and broke.

[0002]

2. Description of the Related Art Due to increasing demands for resource saving and global environmental protection, the recycling rate of waste paper and waste paper has increased, and it has been laminated as well as magazines which have been difficult to deink and remove foreign substances in the past. Paper containers and the like have also come to be used as paper materials.

Conventionally, a pulper supplies a solution containing a mixture of water and a chemical and a paper stock to a container, mixes and stirs for a certain period, and when disintegration is completed, the discharge port is opened to take out the entire stock slurry. A so-called batch type has been put into practical use.
However, since the batch type pulper has a lot of loss time and poor operability, a continuous type pulper capable of continuously taking out the stock slurry is required, and various proposals have been made (for example, JP-A-2-200883 and JP-A-2-200883). 3-97983
issue).

A typical continuous type pulper rotates a rotor 22 for disaggregation provided at the bottom of a container 21 as shown in FIG. The stock slurry is continuously withdrawn through a strainer provided around 22.

[0005]

However, since the above-mentioned conventional one mixes the undisintegrated stock with the stock slurry, there is a problem that the stock slurry discharged is difficult to be uniform. In addition, it is necessary to sufficiently convect the paper stock and the chemical liquid in the vertical direction of the container, which requires a large power to drive the rotor.

Further, there is a drawback that foreign matter in the stock slurry is more subdivided than necessary due to repeated contact with the rotor having a strong driving force, which makes it difficult to remove it in a later step. Therefore, an object of the present invention is to provide a compact pulper that can continuously obtain a homogeneous stock slurry with low energy consumption and that does not easily cause foreign matter to become fine.

[0007]

In order to achieve the above object, the present invention employs the following means. That is, in a pulper for making stock slurry by mixing and stirring the stock with the solution in the container to make a stock slurry, the vertical center of a vertical cylindrical container with a stock supply inlet at the top and a stock slurry outlet at the bottom A vertical rotating shaft is provided on the line, stirring blades are arranged in multiple stages on the vertical rotating shaft, and a spiral screw blade for guiding the paper material downward is provided at the upper part of the vertical rotating shaft, and at the take-out port. It is characterized by being provided with an auger-like discharging means for feeding the stock slurry.

The pulper of the present invention uses a vertical cylindrical container, in which the paper material supplied from the upper part is agitated by agitation blades attached to the vertical rotating shaft in multiple stages, and is gradually disintegrated as it moves downwards. It is designed to be discharged from an outlet provided at the bottom of the mold cylindrical container.

The supply of stock does not have to be continuous, for example every time a predetermined amount of stock slurry is discharged. Further, since the time required for disaggregation varies depending on the type of stock material supplied, it is necessary to appropriately adjust the discharge amount of the stock material slurry. Good.

The number of rotations of the vertical rotation shaft may be low. Also,
It is preferable that the screw blades provided in the upper part have a pitch of 1 pitch or less so that the undisintegrated stock can be fed downward. The shape and number of the stirring blades are not particularly limited, but as described in claim 2, the cross-section is rhomboid, extends horizontally from the vertical rotation axis, and is curved in the direction opposite to the rotation direction. Therefore, it is desirable to increase the number.

As a result, it is difficult for string-like foreign matter to be entangled with the stirring blades, and since the upper part of the vertical cylindrical container is in an undisintegrated state, the stirring force can be reduced, and in a state where the disintegration progresses as the lower stage moves. Sufficient stirring power can be applied, and a homogeneous stock slurry can be produced.

Further, in the stirring by the stirring blade, the contents are easily rotated together with the stirring blade. Therefore, as described in claim 3, the plurality of vertical ribs and the stirring of each stage are provided on the inner wall of the vertical cylindrical container. Horizontal ribs may be provided so as to protrude in the middle of the blades.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, the structure of the pulper is such that a vertical cylindrical container 1 is placed on a pedestal 11, a conveyor 15 for supplying paper stock is provided above the vertical cylindrical container 1, and a vertical cylinder is provided below the conveyor 15. A separator 16 is provided for removing foreign matter from the stock material slurry discharged from the container 1.

At the upper end of the vertical cylindrical container 1, a paper feed port 7 is provided.
Is provided, and an outlet 8 is provided on the side of the lower end. A vertical rotary shaft 2 is rotatably supported by a bearing at the center of the vertical cylindrical container 1 in the vertical direction. The vertical rotary shaft 2 is driven by a motor 12 provided under the gantry 11 via a speed reducer 13. ing.

The vertical rotary shaft 2 is provided with a spiral screw blade 3 and a plurality of stirring blades 4, and the stirring blades 4 are fixed in multiple stages with the screw blade 3 as the uppermost portion. As shown in FIG. 2, the screw blade 3 has a pitch of less than 1 and has a cutout 3a.

As shown in FIG. 3, the shape of the stirring blade 4 is horizontal outward from the vertical rotation shaft 2 and curved in the opposite direction to the rotation direction, and has a rhombic cross section, as shown in FIG. And the number of sheets is two. Then, in the middle stage, three sheets are provided as shown in FIG. 4, and in the lower stage, four sheets are provided as shown in FIG.

At the lowermost stage of the vertical cylindrical container 1, there is provided an auger-like discharging means 6 for sending the stock slurry to an outlet 8. The rotation speed of the auger is controllable, and the discharge amount of the stock slurry can be controlled. In addition, 6a is a motor. In addition, a plurality of vertical ribs 1a are vertically fixed to the inner wall of the vertical cylindrical container 1, and horizontal ribs 1b are provided in the middle of the stirring blades 4 in each stage. Furthermore, chemicals for disaggregating the stock material (for example, NaO
Pipes for supplying H, deinking agent, Na2SiO3, H2O2, steam) are connected to the vertical cylindrical container 1.

Although not shown, this pulper is provided with a density control mechanism for keeping the density of the discharged paper stock slurry constant. As shown in FIG. 6, the relationship between the density of the discharged paper stock slurry and the load of the motor 12 is created in advance as a table B.
The load (current value) is detected and the amount of water is automatically increased or decreased so as to reach the target concentration of the stock slurry.

Next, the operation of the pulper configured as described above will be described. This pulper has a vertical cylindrical container 1
The stock slurry is continuously discharged from the outlet 8 of
When the liquid level of the vertical cylindrical container 1 drops to a predetermined position, the conveyor 15 automatically operates and the paper material is supplied from the supply port 7.

The supplied paper material dissolves in the solution in the vertical cylindrical container 1 and is guided downward by the screw blades 3. At this stage, some stocks are in the form of lumps,
Since the screw blades 3 are less than one pitch, the lump moves downward from the cutout 3a. The moved paper material is a stirring blade 4
Is mixed with the solution and stirred, and disaggregation proceeds, and the take-out port 8
It is descended as it is discharged from, and is sequentially stirred by the lower stirring blade 4.

The rotation speed of the stirring blade 4 is low, and the stirring is planar, but the vertical rib 1a and the horizontal rib 1b attached to the inner wall of the vertical cylindrical container 1 prevent the rotation of the stock slurry. Therefore, it does not rotate with the stirring blade.
Since the number of stirring blades 4 in the upper stage is small, the downward movement is smooth even in the undisaggregated state, and since the number of stirring blades 4 in the lower stage is large, the stirring force increases. A homogeneous stock slurry is produced. Further, since the stirring power is large in the lower stage, the ability to separate the ink particles adhering to the disaggregated fibers also becomes large.

When it is necessary to control the time of staying in the vertical cylindrical container 1 depending on the stock, the rotation speed of the auger of the discharging means 6 is changed. Further, the density of the stock slurry is based on Table B, and depending on the detected load state of the motor 12,
The amount of water is automatically controlled.

When the supplied paper material descends to the vicinity of the take-out port 8, it becomes a homogeneous stock material slurry and is discharged from the take-out port 8. Then, the discharged paper material slurry is subjected to removal of foreign matters by the separator 16 and is conveyed to the subsequent processing step. The separator 16 uses a wire mesh having a coarse mesh.

[0024]

As described above, in the pulper of the present invention, the vertical rotation axis is provided on the substantially vertical center line of the vertical cylindrical container having the stock material supply port at the upper part and the stock material slurry take-out port at the lower part. The vertical rotating shaft is provided with multi-stage stirring blades, and the upper portion of the vertical rotating shaft is provided with a spiral screw blade for guiding the paper material downward, and the auger-shaped auger feeding the paper stock slurry to the outlet. Since the paper stock supplied from the supply port moves downward as the disaggregation progresses, there is no vertical circulation as in the past, and therefore it is considered that undisaggregated and disaggregated have advanced. The paper stock slurry that has not been mixed and has been uniformly disintegrated is taken out from the outlet, and the power for disintegrating may be small.

Since the stirring blades are provided in multiple stages,
A large stirring working volume is obtained, and sufficient disaggregation is performed even if the rotation of the stirring blade is small. Therefore, not only can the device be made compact, but it is possible to prevent the foreign matter from being fragmented, which facilitates the subsequent process.

[Brief description of drawings]

FIG. 1 is a front view showing an overall configuration of an embodiment of a pulper according to the present invention.

FIG. 2 is a plan view of the screw blade.

FIG. 3 is a plan view of the stirring blade in the upper stage.

FIG. 4 is a plan view of the stirring blade in the middle stage.

FIG. 5 is a plan view of the stirring blade in the lower stage.

FIG. 6 is an explanatory diagram of control of the density of the stock slurry.

FIG. 7 is a front view of a conventional pulper.

[Explanation of symbols] 1 ... Vertical cylindrical container 1a ... Vertical rib 1b ... horizontal rib 2 ... vertical rotation axis 3 ... Screw blade 3a ... Notch 4 ... Stirring blade 6 ... Ejection means 6a ... Motor 7 ... Supply port 8 ... Exit 11 ... Stand 12 ... Motor 13 ... Reducer 15 ... Conveyor 16 ... Separator

Claims (3)

[Claims] 1. A pulper for producing a stock slurry by mixing and agitating a stock with a solution in a container to produce a stock slurry, which comprises a vertical cylindrical container having a stock supply inlet at an upper portion and a stock slurry outlet at a lower portion. A vertical rotating shaft is provided on a substantially vertical center line, stirring blades are arranged in multiple stages on the vertical rotating shaft, and a spiral screw blade that guides the paper material downward is provided above the vertical rotating shaft. A pulper characterized by having an auger-like discharge means for sending a stock slurry at the outlet. 2. The stirring blade has a rhombic cross section, extends horizontally from a vertical rotation axis, and is curved in a direction opposite to the rotation direction,
The pulper according to claim 1, wherein the number is increased as it goes to the lower stage. 3. The pulper according to claim 1, wherein a horizontal rib is provided on the inner side wall of the vertical cylindrical container so as to project in the middle of a plurality of vertical ribs and the stirring blades of each stage.