JP2012052254A - Kneading pulper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a kneading pulper that can increase a production amount of paper stock slurry, prevent a long foreign body such as a string from being wound around a vertical rotation axis, and reduce facility cost.SOLUTION: A kneading pulper 1 comprises: a vertical type cylindrical vessel 20 in which paper stock slurry is made by mixing and stirring paper stock 2 injected from a supply port 20a at the upper part with a solution and defibrating the mixture; a vertical rotation axis 30 which is vertically extended and rotatable at the center of the vertical type cylindrical vessel 20; and a pulping rotor 40 which is installed at the upper part of the vertical rotation axis 30 and presses the paper stock 2 while guiding it downward. Saw teeth 40a are formed on an edge part 40b at a rotational direction side of the pulping rotor 40.

Description

  The present invention relates to a kneading pulper that creates a stock slurry by mixing and stirring the stock with a solution to disaggregate, and in particular, increasing the amount of stock slurry produced by an induction rotor assembled at the top of a rotating shaft. About kneading pulper that can do.

  In recent years, demands for resource conservation and global environmental conservation have increased, and the recycling rate of waste paper and waste paper has increased. When a resource cycle is performed on a paper material that is a papermaking raw material such as waste paper and waste paper, a paper material slurry is made from the paper material using a pulper. The pulper makes a stock slurry by mixing and agitating the stock with a solution to disaggregate. For example, there is a kneading pulper described in Patent Document 1 proposed by the present applicant.

  As shown in FIG. 7, in the kneading pulper 101 described in Patent Document 1 below, the paper material 102 is poured into a vertical cylindrical container 120 into which water and chemicals have been poured and melted. The pulping rotor 140 assembled to the upper part of the vertical rotating shaft 130 presses the paper 102 while guiding the paper 102 downward, and the kneading rotor 150 assembled to the vertical rotating shaft 130 in multiple stages mixes the paper 102. Promote stirring. As a result, disaggregation of the stock 102 gradually proceeds, and a homogeneous stock slurry is produced. Thereafter, the paper slurry is discharged from the take-out pipe 104.

JP 2007-16377 A

  By the way, in recent years, a lot of laminated paper, water-resistant paper, and plastics are in circulation, and the ratio of foreign matters such as laminated paper has increased in the papermaking raw material that is put into the kneading pulper. ing. For this reason, the above-mentioned foreign matter cannot be finely dispersed, the degree of disaggregation of the stock is lowered, and the production amount (yield) of the stock slurry is reduced. Furthermore, when a long foreign matter such as a string is included in the papermaking raw material, the long foreign matter may be wound around the vertical rotation shaft 130. In this case, it is necessary for the worker to stop the operation of the kneading pulper 101 and remove the long foreign matter, which causes a problem that the operation efficiency is lowered.

  Therefore, in order to deal with the above-described problem, in the kneading pulper 101 described in Patent Document 1, first, the papermaking raw material 107 (waste paper bale) is finely crushed to about 30 cm using the crusher 106. As a result, the above-described foreign matter was finely dispersed and long foreign matter was cut, and then the crushed paper stock 102 was put into the vertical cylindrical container 120. However, the crusher 106 itself is an expensive one of about tens of millions of yen, and the use of the crusher 106 has caused a new problem that the equipment cost increases.

  In order to solve the above-described problems, the present invention can increase the production amount of the stock slurry, can prevent a long foreign object such as a string from being wound around the vertical rotating shaft, and further reduce the equipment cost. It aims to provide a kneading pulper that can.

  The kneading pulper according to the present invention includes a vertical container in which a stock slurry is made by mixing and stirring the stock introduced from the upper supply port with the solution, and a central portion in the vertical container. A rotating shaft that extends vertically and is rotatable, and a guide rotor that is assembled to the top of the rotating shaft and presses the paper while guiding the paper downward. The part is characterized by the formation of sawtooth teeth.

In the kneading pulper according to the present invention, it is preferable that the sawtooth teeth have a trapezoidal shape.
In the kneading pulper according to the present invention, it is preferable that the saw-tooth is formed in a radially outer side portion of the edge portion.

  Therefore, according to the present invention, since saw-toothed teeth are formed at the edge portion on the rotational direction side of the induction rotor, lamination was performed out of the stock put in from the upper supply port of the vertical container. Foreign matter such as paper is finely dispersed by sawtooth teeth. Thereby, the disaggregation degree of the stock can be increased in the vertical container, and the production amount (yield) of the stock slurry can be increased. In addition, even if a long foreign object such as a string is included in the input material, the long foreign object can be cut by the saw-tooth and the long foreign object is wound around the vertical rotation shaft. Can be prevented. Furthermore, according to the kneading pulper of the present invention, it is possible to obtain the same effect as when a crusher is used without using a crusher, and the equipment cost can be reduced by omitting an expensive crusher. .

It is the block diagram which showed the paper material reproduction | regeneration system to which the kneading pulper of this embodiment is applied. It is a whole block diagram of the kneading pulper shown in FIG. FIG. 3 is an enlarged plan view and an enlarged side view of the pulping rotor shown in FIG. 2. FIG. 4 is an enlarged view of the saw-tooth shown in FIG. 3. FIG. 4 is a plan view showing a first modified embodiment of the pulping rotor shown in FIG. 3. It is the top view which showed 2nd deformation | transformation embodiment of the pulping rotor shown in FIG. It is the figure which showed the state in which the crushing paper material crushed with the crusher is thrown into a kneading pulper conventionally.

  Next, an embodiment of a kneading pulper according to the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing a paper recycling system to which a kneading pulper 1 of the present invention is applied.

  In this stock recycling system, as shown in FIG. 1, a conveyor 3 carrying a stock 2 as a papermaking raw material is disposed above a kneading pulper 1. The filtration device 5 is connected. The paper stock 2 is a waste paper bale which has been compressed and packed, and the waste paper bale is not crushed by a crusher (see FIG. 7). That is, this paper recycling system is not provided with a crusher. The paper stock 2 is fed into the kneading pulper 1 by the conveyor 3.

  The kneading pulper 1 makes a paper slurry by mixing and stirring the paper 2 with a solution, and a homogeneous paper slurry having a solid content concentration of about 15 to 20 percent with respect to moisture is formed. It is discharged from the extraction pipe 4. The paper slurry discharged from the take-out pipe 4 is mixed with the dilution water in the filtration device 5 so that the solid content concentration in the water is reduced to 2 to 4 percent. The filtering device 5 is configured to filter the paper slurry by removing heavy foreign matter with a disk screen (not shown). The filtered paper slurry is then conveyed to subsequent processing steps. Hereinafter, the configuration of the kneading pulper 1 will be described with reference to FIG.

  As shown in FIG. 2, the kneading pulper 1 has a vertical cylindrical container 20 erected on a gantry 10. The vertical cylindrical container 20 is formed with a supply port 20a into which the stock 2 is introduced at the upper end, and connected to the take-out pipe 4 through which the stock slurry is discharged at the lower side. In the vertical cylindrical container 20, a vertical rotation shaft 30 extending in the vertical direction is supported at the center portion so as to be rotatable. The vertical rotation shaft 30 is configured such that the driving force of the motor 11 provided at the lower part of the gantry 10 is transmitted via the speed reducer 12.

  Two pulping rotors 40 (induction rotors) are assembled on the upper part of the vertical rotating shaft 30. Each pulping rotor 40 has a thin plate shape that pushes the paper stock 2 introduced from the supply port 20a while guiding it downward, and extends from the vertical rotation shaft 30 in the radially outward direction. In addition, a kneading rotor 50 (stirring rotor) is assembled in four to five stages at an intermediate portion and a lower portion of the vertical rotating shaft 30. The kneading rotor 50 promotes mixing and stirring while kneading the stock 2 and extends in a spiral shape from the vertical rotation shaft 30 in the radially outward direction. The kneading rotors 50 provided in the 4th to 5th stages are three in the uppermost stage and four in the lower stage than the uppermost stage. The reason why the number of kneading rotors 50 increases in the downward direction is to increase the stirring force stepwise.

  In addition, a plurality of vertical ribs 21 extending in the vertical direction are projected on the inner wall of the vertical cylindrical container 20 in order to promote mixing and stirring of the stock 2, and the intermediate height of the kneading rotor 50 at each stage is also increased. Further, a horizontal rib 22 is projected. On the other hand, a screw feeder 60 is provided at the bottom of the vertical cylindrical container 20 in order to discharge the paper slurry to the take-out pipe 4. The screw feeder 60 can adjust the discharge amount of the paper slurry by controlling the rotation speed of the motor 61. The above-described filtration device 5 is provided at the tip of the screw feeder 60.

Further, in order to supply chemicals or the like (for example, NaOH, deinking agent, Na ₂ SiO ₃ , H ₂ O ₂ , steam) for separating the material 2 into the vertical cylindrical container 20, a pipe 23 is provided. , 24 are connected. Water flows through the pipe 23, and steam flows through the pipe 24. The pipe 23 is branched and divided into two directions. The two branched pipes 23 are connected to electromagnetic on-off valves 25 and 26, respectively, and the pipe 24 is connected to an electromagnetic on-off valve 27. For example, NaOH, a deinking agent, and Na ₂ SiO ₃ are sent to the secondary side of the electromagnetic on-off valve 25, and H ₂ O ₂ , for example, is sent to the secondary side of the electromagnetic on-off valve 26. ing.

Here, the operation of the kneading pulper 1 will be described. In the kneading pulper 1, the electromagnetic cylindrical valves 25, 26, and 27 are driven to fill the vertical cylindrical container 20 with the solution, and the stock 2 is fed from the supply port 20a. The input stock 2 is dissolved in the solution in the vertical cylindrical container 20, and the pulping rotor 40 presses the stock 2 while guiding it downward.
On the other hand, at the bottom of the vertical cylindrical container 20, as described above, the paper slurry is discharged to the take-out pipe 4 by the screw feeder 60, so that the paper 2 supplied from above is placed in the bottom of the vertical cylindrical container 20. It sinks in order toward. Then, the kneading rotor 50 promotes mixing and stirring while kneading the paper stock 2, and the disaggregation of the paper stock 2 gradually proceeds.

Further, in the kneading rotor 50 provided in 4 to 5 stages, since the number of rotors is 3 at the uppermost stage and the number of rotors is small, the stock 2 is smoothly moved downward even when the stock 2 is not disaggregated. Can move to. On the other hand, since the number of rotors is four in the lower stage than the uppermost stage, the stirring force is large and the ability to separate the ink particles attached to the fibers is large.
In this way, the stock 2 introduced from the supply port 20a is lowered in the vertical cylindrical container 20 while being disaggregated in the solution by the above-described mixing and stirring, and the concentration of the solid content in the water is 15 to 20 A homogeneous stock slurry of about a percent is made. Thereafter, the paper slurry is discharged from the take-out pipe 4 to the filtration device 5.

  By the way, in recent years, a large amount of laminated paper, water-resistant paper, and plastics have been distributed, and the ratio of foreign matter such as laminated paper in the stock 2 that is put into the kneading pulper 1 is high. It has increased. For this reason, the above-mentioned foreign matter cannot be finely dispersed, the degree of disaggregation of the stock 2 is lowered, and the production amount (yield) of the stock slurry is reduced. Furthermore, when the stock 2 contains a long foreign matter such as a string, the long foreign matter may wrap around the vertical rotary shaft 30. In this case, it is necessary for the worker to stop the operation of the kneading pulper 1 to remove long foreign matters, which causes a problem that the operation efficiency is lowered.

  Therefore, in this embodiment, in order to cope with the above-described problem, a saw tooth 40a (hereinafter, “each tooth 40a”) is attached to the pulping rotor 40 that is the uppermost rotor assembled to the vertical rotating shaft 30. Are omitted as appropriate). Hereinafter, the configuration of the pulping rotor 40 will be described with reference to FIGS. 3 and 4.

  As shown in FIG. 3, the two pulping rotors 40 have the same shape and are each joined to the cylindrical member 41. The cylindrical member 41 is assembled to the vertical rotation shaft 30 so as to be integrally rotatable. Each pulping rotor 40 is a thin plate member that wraps around the cylindrical member 41 while being lowered so that the paper stock 2 can be pressed downward. And the edge part 40b by the side of the rotation direction of each pulping rotor 40 is helically extended from the cylindrical member 41 (vertical rotating shaft 30), and each tooth | gear 40a is formed in this edge part 40b. This is to disperse and cut the above-mentioned foreign matter on each tooth 40a when each pulping rotor 40 rotates.

  Each tooth 40a is formed only on the radially outer side of the edge portion 40b described above. This is because the rotation speed (circumferential speed) of the pulping rotor 40 increases toward the outer radial direction, and the ability to disperse and cut the foreign matter described above increases. And each tooth 40a is not formed other than the part on the radially outer side, for example, when each tooth is formed on the entire edge part 40b, the rotational speed of the part on the radially inward side of the edge part. This is because the foreign matter may be caught on the teeth on the radially inward side. Based on the above-described idea, in the pulping rotor 40, the distance from the rotation center O1 to the position of the radially inner end of each tooth 40a with respect to the distance R1 from the rotation center O1 to the position of the radially outer end of each tooth 40a. The ratio R2 / R1 of the distance R2 is set to 9/10.

  The ratio R2 / R1 described above can be changed as appropriate depending on the size of the pulping rotor 40, the rotation speed, and the like. Moreover, although the above-mentioned distance R1 is set to 1000 mm, it can be changed as appropriate. Here, it was confirmed that when the above-described ratio R2 / R1 is larger than 7/10, the above-described foreign matter can be effectively dispersed and cut. For this reason, in the present invention, the fact that each tooth 40a is formed in the radially outward portion of the edge portion 40b means that the above-described ratio R2 / R1 is larger than 7/10.

  Further, as shown in FIG. 4, eight teeth 40a are formed continuously like a saw blade. This is because, for example, the shearing force for shearing the foreign matter is increased as compared with the case where each tooth is formed apart. The number of teeth 40a is not limited to eight, and can be changed as appropriate. Each tooth 40a has a trapezoidal shape, and each tooth 40a has an obtuse angle. This is because, for example, the corners are less likely to be worn than when each tooth has a triangular shape. That is, each tooth 40a preferably has an obtuse angle rather than an acute angle in order to make the corner difficult to wear.

  Therefore, according to the kneading pulper 1 provided with the pulping rotor 40 of this embodiment, among the paper stock 2 input from the supply port 20a, laminated paper, water-resistant paper, plastics, confidential Foreign matter such as a cardboard box containing a document is finely dispersed by the saw-tooth 40a of the pulping rotor 40. The disaggregation degree of the stock 2 can be increased in the vertical cylindrical container 20, and the production amount (yield) of the stock slurry can be increased. Further, even if the inserted stock 2 contains a long foreign object such as a string, the long foreign object can be cut by the saw-tooth 40a of the pulping rotor 40. Winding around the vertical rotation shaft 30 can be prevented.

  Further, the pulping rotor 40 of this embodiment is the same as the conventional pulping rotor except that saw-tooth teeth 40a are formed. For this reason, the pulping rotor 40 can be easily configured simply by forming the sawtooth teeth 40a on the pulping rotor that is an existing component. And according to the kneading pulper 1 provided with this pulping rotor 40, the same effect as the case where a crusher is used without using a crusher (see FIG. 7) can be obtained, and several thousand per unit. Equipment costs can be reduced by omitting about 10,000 expensive crushers.

Although the kneading pulper according to the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the present invention.
For example, in the present embodiment, each tooth 40a is directly formed on a pulping rotor that is an existing component member. However, as in the first modified embodiment shown in FIG. The attachment member 70 having each tooth 40a may be attached to the pulping rotor to indirectly form each tooth 40a.

  In the present embodiment, there are two pulping rotors 40, but the number of the pulping rotors 40 is not limited to two. For this reason, for example, the number of the pulping rotors 40 may be three as in the second modified embodiment shown in FIG.

  Further, in the present embodiment, each tooth 40a is formed only on the radially outer side portion of the edge portion 40b, but each tooth 40a is added to the radially outer side portion of the edge portion 40b and the radially intermediate portion. May also be formed. Moreover, although the angle | corner of each tooth | gear 40a is an obtuse angle, an acute angle may be sufficient.

  In the present embodiment, each tooth 40a has a trapezoidal shape having corners, but the shape of each tooth is not limited to a shape having corners. For example, each tooth has a triangular shape with a bent tip. May be. In this case, compared to the teeth 40a of the present embodiment, the shearing force for shearing the foreign matter is reduced, but the wear of each tooth can be reduced.

DESCRIPTION OF SYMBOLS 1 Kneading pulper 2 Paper 3 Conveyor 4 Unloading pipe 5 Filtration apparatus 10 Base 20 Vertical cylindrical container 30 Vertical rotating shaft 40 Pulping rotor 40a Sawtooth-shaped tooth (each tooth)
40b Edge portion 41 Cylindrical member 50 Kneading rotor 60 Screw feeder 70 Mounting member

Claims (3)

A vertical container in which a paper slurry is made by mixing and agitating the material charged from the upper supply port with the solution, and a rotating shaft that can rotate up and down at the center of the vertical container. And a kneading pulper equipped with an induction rotor that is assembled to the upper part of the rotating shaft and presses the paper while guiding the paper downward,
A kneading pulper characterized in that sawtooth-shaped teeth are formed on an edge portion on the rotational direction side of the induction rotor. In the kneading pulper according to claim 1,
The kneading pulper characterized in that the saw-tooth is trapezoidal. In the kneading pulper according to claim 1 or 2,
The saw-toothed pulper is characterized in that the saw-tooth is formed in a radially outward portion of the edge portion.

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