JPH06346352A - Production of mat from waste paper-opened pulp as feedstock - Google Patents

Abstract

PURPOSE:To easily obtain a uniform mat from waste paper-opened pulp as feedstock. CONSTITUTION:Waste paper-opened pulp obtained by dry opening of waste paper is mixed with air flow to spray the mixture onto a revolving and, air- permeable endless belt 2 while sucking 5 the air through the back surface of this endless belt to continuously produce the objective mat M compressed on the endless belt, which is transferred onto a flat plate 6 for transference which moves in the advancing direction of this endless belt at a velocity relative to that of the endless belt at the edge face in the advancing direction of the endless belt.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a used paper defibrated pulp which is obtained by defibrating used paper into a fibrous state to form a used paper defibrated pulp, which is used as a raw material to obtain a continuous mat-shaped molded product. The present invention relates to a method for manufacturing a mat used as a raw material.

[0002]

2. Description of the Related Art From the viewpoint of protecting the global environment, it is necessary to collect used paper for recycling. In the conventional recycling of this used paper, a large amount of water is added to the recovered used paper to form a slurry in the form of mud, and the mixture is forcibly stirred and defibrated, and this method is called the pulper method. . This pulper method uses cellulose fiber, which is the main constituent of paper, as starch.
Although it is solidified with a water-soluble adhesive such as clay, it is dissolved and separated with water, but naturally, a large amount of the wastewater that is a mixture of the above-mentioned adhesive and wastewater is discharged, so a large amount of wastewater treatment The waste paper had to be carried to a specific factory (usually a paper manufacturing factory) equipped with facilities, which had a drawback that the cost of recycling increased.

Therefore, recently, waste paper is defibrated by a dry method without using water, by a crusher or the like so as to cut pulp fibers as little as possible, and a small amount of a binder is uniformly mixed therein, and then heated and compressed. Proposals have been made to recycle wood boards and soft cushioning materials.

[0004]

However, in any case of molding the above-mentioned wood board or cushioning material, waste fiber defibrated pulp is molded into a continuous mat having a predetermined thickness prior to heating and compression. Although technology is required, the defibrated waste paper that has been defibrated by the dry method has pulp fibers intricately entwined in a complicated manner, is very bulky, and has an apparent specific gravity of 0.0.
Since it has unique properties such as being very light around 3,
There is a problem that it is difficult to make this into a mat by an existing industrial method.

That is, since the defibrated waste paper defibrated by the dry method is complicatedly entangled with pulp fibers, it is matted to have a uniform thickness. It is difficult to achieve a uniform thickness, and it is difficult to achieve a uniform thickness because it is easy to be affected by external forces such as wind because it has a low specific gravity. In addition, if the dry defibrated waste paper defibrated pulp is inadvertently conveyed, an external force locally acts and the density of the used paper defibrated pulp at that part becomes dense, causing uneven thickness and unevenness. There is a problem that a uniform mat cannot be obtained.

[0006] Therefore, an object of the present invention is to provide a method for producing a mat using waste fiber defibrated pulp as a raw material, from which a uniform mat can be easily obtained.

[0007]

In order to solve the above-mentioned problems, in order to solve the above-mentioned problems, the structure of the present invention, which is based on the above-mentioned object, has a defibrated waste paper obtained by dry defibration. The pulp is mixed with a stream of air and blown onto a rotating, breathable endless belt while at the same time drawing air from the back of the endless belt to continuously produce a compressed mat on the endless belt. It is a technical measure that is characterized by what has been done,
At the end face in the traveling direction of the endless belt, a technical means is provided for transferring the mat onto a transfer flat plate that travels at a speed relative to the endless belt.

[0008]

Therefore, in the method for producing a mat made from the defibrated pulp of waste paper of the present invention, since the endless belt has air permeability, the endless belt exhibits a separating action between the defibrated pulp of waste paper and the air flow, and spraying In the air flow mixed with the defibrated pulp of waste paper, the defibrated pulp of waste paper is accumulated on the endless belt, and the air flow passes through the endless belt.

In addition to the breathability of the endless belt,
By sucking air from the back surface of the endless belt,
It has a rectifying action that minimizes the turbulence of the air flow that collides with the endless belt and waste paper disentangled pulp accumulated on it, and prevents the waste paper disentangled pulp from scattering due to spraying and It exerts a uniformizing action at each site.

Further, the blowing of the mixed air flow of waste paper disentangled pulp onto the endless belt and the suction of air from the back surface of the endless belt have the effect of compacting the waste paper disentangled pulp accumulated on the endless belt, The piled waste paper defibrated pulp forms a mat in which the fibers are intimately entangled.

[0011]

Embodiments of the present invention will now be described with reference to the accompanying drawings. First, in the present invention, a defibrated pulp obtained by dry defibrating used paper is mixed with an air stream and sprayed onto a rotating breathable endless belt.

In order to defibrate used paper with a dry method, it is sufficient to defibrate it with a crusher or the like so that the fibers of the pulp are cut as little as possible. Disentangle.

In order to mix the defibrated waste paper defibrated pulp with the air flow, a conventionally known air transportation device can be used. A transportation air flow is made to flow in the air transportation path, That is, the defibrated pulp of waste paper (a binder that binds the defibrated pulp of waste paper may be mixed at this stage) may be quantitatively fed into the air transportation path.

In the illustrated example, 1 is the air transportation path,
A nozzle 3 is provided at the downstream end of the air transport path 1, and an air flow mixed with waste paper disentangled pulp is jetted from the nozzle 3. Then, the air flow mixed with the defibrated pulp of the used paper is blown onto the rotating air-permeable endless belt 2, and the endless belt 2 may be a mesh belt.

As a concrete example of the endless belt 2, a Teflon 80-mesh net having a smooth surface is used, and the endless belt 2 is hung on a driving roller 21 and guide rollers 22, 23, 24 to rotate. ing.
Then, the nozzle 3 is opposed to the endless belt 2, and an air flow mixed with waste paper disentangled pulp is jetted from the nozzle 3 toward the endless belt 2.

According to the present invention, at the same time as the air flow mixed with the defibrated pulp of the used paper is blown, air is sucked from the back surface of the endless belt 2 and the mat M compressed on the endless belt 2 is continuously drawn. To generate.

In the figure, 5 is a suction box for sucking air from the back surface of the endless belt 2, and a suction pipe 52 is housed in a box 51 whose upper opening is close to the back surface of the endless belt 2. 5
One end of 2 is connected to a suction port of a suction pump (not shown). It should be noted that if the air suction amount of the suction box 5 is set to be larger than the blowing amount from the nozzle 3, the rectifying action is more clearly shown, which is desirable.

The defibrated pulp of waste paper has an average length of about 1.8 mm in the case of mechanical pulp, and when it is sprayed onto the endless belt 2 of 80 mesh, the defibrated pulp of waste paper is laminated on the endless belt 2. However, once the defibrated pulp of waste paper accumulates on the endless belt 2, this becomes a filter layer that allows air to pass through, and the defibrated pulp of the waste paper passes through the endless belt 2 in a negligible amount. . Therefore, the mat M having a desired thickness can be deposited on the endless belt 2 by blowing the air flow mixed with waste paper disintegrated pulp to the endless belt 2 by the method of the present invention.

However, when the air flow mixed with the waste paper defibrated pulp is blown onto the endless belt 2 from the nozzle 3, if the injection amount is locally deviated, a uniform mat M cannot be formed. In order to solve this point, one is to increase the diameter of the nozzle 3 so as to correspond to the entire width of the endless belt 2, or to arrange a plurality of small diameter nozzles 3 side by side in the width direction of the endless belt 2. There are a method of jetting while moving the nozzle 3 in the width direction of the endless belt 2, and a method of setting the jetting position of the nozzle 3 to a position farther than the endless belt 2 and dispersing at the time of jetting. Of course, either of these methods is available. These may be used alone or in combination, but in the illustrated embodiment, the injection position of the nozzle 3 is set to a position farther than the endless belt 2 so as to make the injection amount uniform.

That is, in the illustrated embodiment, above the endless belt 2, a diffusion box 4 whose lower opening is close to the endless belt 2 and also serves to prevent scattering is arranged, and the nozzle 3 is housed in the diffusion box 4. The defibrated pulp of waste paper ejected from the nozzle 3 is diffused in the diffusion box 4 to be homogenized and then sprayed onto the endless belt 2. In order to ensure the diffusion, it is necessary to greatly reduce the blowout pressure from the nozzle 3 in the diffusion box 4.
If the decompression inside the diffusion box 4 is too large, the airflow will not easily pass through the endless belt 2. Therefore, in the present embodiment, the suction force of the suction box 5 is used to compensate for the reduced pressure in the diffusion box 4 so that the airflow can pass through the endless belt 2 without fail. Since it is easy to make it uniform,
It also contributes to the uniform dispersion of waste paper defibrated pulp by rectifying the air flow inside.

In the illustrated example, the endless belt 2
The nozzle 3 has a wide width, so that the nozzle 3 is movable as shown by an arrow P1 in FIG.
Inside, the nozzle 3 is movable in the width direction of the endless belt 2, and the injection amount is made more uniform.

The mat M obtained as described above is considerably compacted by spraying from the nozzle 3 and suction from the back surface of the endless belt 2, so that the mat has weakness but is considerably easy to handle. . Therefore, in the present invention, the mat M is configured to be transferred onto the transfer flat plate that travels at a speed relative to the endless belt 2 at the end surface in the traveling direction of the endless belt 2.

In the illustrated example, 7 is a drive type roller conveyor, and a transfer flat plate 6 is provided on the roller conveyor 7.
Has a speed relative to the endless belt 2 (at a constant speed)
The mat M, which is made to move and drops on the end face of the endless belt 2 in the moving direction, is successively placed on the transfer flat plate 6. The mat M on the transfer flat plate 6 is conveyed to the next step in a state of being placed on the transfer flat plate 6 and is heated under pressure by a conventionally known forming machine or the like to a wooden board or a soft cushion. You can use it as a material.

In the embodiment shown in FIG. 3, the transfer flat plate 6 is replaced with a second endless belt 8 different from the endless belt 2. In this embodiment, a steel plate is attached to the second endless belt 8. A plurality of pinching rollers 81, 81, 81 are provided in the middle of the second endless belt 8, and a pressure heating roller group 9 is provided in front of the end face in the traveling direction of the second endless belt 8. The mat M is squeezed on the second endless belt 8 and the pressing rollers 81, 8
After being compressed by 1, 81 and having a predetermined strength, it is separated from the second endless belt 8 and independently pressurized and heated by the pressure heating roller group 9 to form a long molded product. It is suitable for thin sheet production.

[0025]

EFFECTS OF THE INVENTION Since the present invention is as described above, it is possible to provide a method for producing a mat made from waste paper disentangled pulp, which is capable of continuously converting the disintegrated pulp of waste paper into a uniform mat with a simple device. is there.

Further, according to the present invention, the endless belt 2 is blown with an air flow mixed with waste paper disentangled pulp, and air is sucked from the back surface of the endless belt 2. Therefore, the mat formed on the endless belt 2 M is compacted by an air flow and can provide a method for producing a mat made from waste paper defibrated pulp, which is easy to handle thereafter.

Further, the present invention can provide a method for producing a mat using waste fiber defibrated pulp as a raw material, which can be directly fed to the hot pressing step in the next step by placing the mat M on the transfer flat plate 6. is there.

[Brief description of drawings]

FIG. 1 is a front view of an example of a device that implements the present invention.

FIG. 2 is a plan view.

FIG. 3 is a front view of a main portion of another example of a device that implements the present invention.

[Explanation of symbols]

 1 Air Transport Path 2 Endless Belt 3 Nozzle 4 Diffusion Box 5 Suction Box 6 Transfer Flat Plate 7 Roller Conveyor 8 Second Endless Belt 9 Pressure Heating Roller Group

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yoshito Kakihara 2-3-3 Niihama, Niimachi, Takasago-shi, Hyogo Prefecture Takasago Works, Kobe Steel, Ltd. (72) Hiroyuki Tanaka Araimachi, Niimachi, Takasago, Hyogo Prefecture 2-3-1 Hama Inside Takasago Works, Kobe Steel, Ltd.

Claims (2)

[Claims] 1. A waste paper defibrated pulp obtained by dry defibrating waste paper is mixed with an air stream and sprayed onto a rotating breathable endless belt, and at the same time air is sucked from the back surface of the endless belt. Then, a compressed mat is continuously produced on the endless belt, and a method for producing a mat using waste fiber defibrated pulp as a raw material. 2. A defibrated pulp of waste paper obtained by dry defibration of used paper is mixed with an air stream and sprayed onto a rotating breathable endless belt, and at the same time air is sucked from the back surface of the endless belt. Then, a compressed mat is continuously generated on the endless belt, and the mat is transferred onto the transfer flat plate that advances at a speed relative to the endless belt at the end face in the traveling direction of the endless belt. A method for producing a mat using waste fiber defibrated pulp as a raw material.