JP3426799B2 - Waste paper pulping equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste paper pulping system used for recycling waste paper and the like.

[0002]

2. Description of the Related Art The following methods have been widely used for pulping waste paper.

First, used paper is supplied into a device called a pulper together with water and required chemicals (caustic soda, hydrogen peroxide solution, etc.), and stirred with a rotating blade for 10 to 20 minutes while applying heat thereto. Large enough to pump used paper to other processing equipment (about 6 to 8
mm).

Next, the crushed waste paper solution having a used paper content concentration of 3 to 5% is supplied by a pump to a stirrer called a chest so that the used paper solution is uniformly dispersed therein. Stir to.

The agitated waste paper solution is supplied to a dehydrator called a screw press. The screw press has a horizontal cylindrical container, and a spiral rotating member horizontally set in the container, the waste paper liquid supplied from the inlet at one end of the cylindrical container, A spiral rotating member feeds towards the outlet at the other end. A large number of dehydration ports are provided at the bottom of the cylindrical container, and the waste paper liquid sent to the outlet is gradually dehydrated and is 1 when discharged from the outlet.
The concentration is about 5 to 20%.

The high-concentration waste paper liquid discharged from the screw press is supplied to a aging tower, which is cylindrical and has its axis set to be vertical, and is retained there for a long time to swell the pulp fiber of the waste paper. Pigment coating layer for printing etc., which was done and was worn on the surface of waste paper,
Impurities such as printing ink, a hot melt layer for bookbinding, and a waterproof layer attached to a beverage paper container and the like are separated from the pulp fiber. The concentration of the waste paper liquid supplied to the aging tower is made high because it is necessary to retain the liquid for a long time and the storage space thereof is reduced as much as possible.

Thereafter, this waste paper solution is added with a diluting solution at the bottom of the aging tower so as to have a concentration of 3 to 5%, discharged from the tower, passed through a filtering device, a deinking device, etc., and impurities are extracted from pulp fibers. Are removed.

It is an object of the present invention to provide a pulping apparatus for waste paper, which is simple in the above-mentioned treatment steps, does not occupy space, and can be efficiently pulped.

Further, in the conventional apparatus as described above, since the pulper needs to crush the waste paper into a size that is easy to transfer by a pump, for example, to crush it to about 6 to 8 mm, the impurities as described above are also crushed into a small size. Therefore, there is a problem that it is difficult to separate the small crushed impurities from the pulp fiber. An object of the present invention is to provide a pulping treatment apparatus that can solve such a problem.

[0010]

That is, the apparatus according to the present invention has, as a basic configuration, a processing container having a supply port and a discharge port, and is connected to the supply port of the container, receives waste paper and crushes it. A waste paper crushing device for supplying to the supply port, and a pulping treatment liquid on the supply port side of the processing container (usually water mixed with necessary chemicals such as caustic soda and hydrogen peroxide solution. In the specification, a treatment liquid supply device for supplying water only), and a transfer device for transferring the crushed and supplied waste paper and pulping treatment liquid from the supply port side toward the discharge port side. Have.

More specifically, the processing container is a cylindrical container, the axis of which is set to be substantially horizontal, the supply port is set at the upper end of one end of the container, and the discharge port is set at the lower end of the other end. Is set.

Further, a transfer having a spiral blade in the cylindrical container, which is made substantially concentric with the container and which sends the waste paper and pulping treatment liquid from the supply port side to the discharge port side by being rotated. A device is provided.

In order to supply steam for promoting the pulping process, it is possible to introduce steam into the container, and in such a case, at the supply port and the discharge port,
A valve is provided to prevent the introduced steam from leaking.

[0014]

1 is a sectional view showing the basic construction of an apparatus 10 for pulping waste paper according to the present invention.

The apparatus has a cylindrical processing container 16 having a supply port 12 and a discharge port 14, and a waste paper M connected to the supply port 12 of the container and supplied by a belt conveyor 18.
Received and crushed, and the processing container 16 is supplied through the supply port 12.
A waste paper crushing device 20 for supplying the inside, a pulping treatment liquid supply device 22 for supplying the pulping treatment liquid to the supply port 12 of the processing container, and a supply port for the crushed and supplied waste paper and the pulping treatment liquid. The transfer device 28 includes a spiral blade 26 that transfers from the 12 side toward the discharge port 14 side.

The used paper crushing device 20 is rotated about a hopper-shaped housing 30 as a whole and a rotation axis which is parallel to and parallel to each other in the housing and crushes the used paper passed therethrough. A pair of rotary cutters 3 for performing
2 and. In this used paper crusher, used paper is crushed to about 50 to 60 mm.

The pulping treatment liquid supply device 22 is composed of pipes 34 and 36 for separately supplying the pulping treatment chemicals such as caustic soda and hydrogen peroxide water, and the diluting water, together with the used paper in the used paper crushing device. These chemicals and dilution water are supplied so that the used paper crushed in the used paper crusher and the used paper liquid consisting of these chemicals and the dilution liquid have a concentration of 15 to 20%. Has been done.

The spiral blade 26 of the transfer device 28 is rotated at a very slow speed by a motor 38,
It takes about 8 to 15 hours for the waste paper liquid supplied from the supply port 12 to be discharged from the discharge port 14.

The waste paper supplied into the processing container 16 is stored in the container for such a long time, so that the pulping treatment liquid swells the pulp fibers of the waste paper and attaches it to the surface of the pulp. The existing pigment coating for printing, printing ink, etc., is released from the pulp.

In the illustrated example, the dilution water is also supplied to the outlet side so that the concentration of used paper in the pulped used paper liquid is reduced to facilitate the discharge.

The waste paper solution discharged from the container is once sent to the storage tank 40, where it is further diluted with water to be stirred and diluted (for example, to a waste paper concentration of 3 to 5%), and then filtered by a pump or degassed. It can be easily delivered to the next process such as an ink processing device.

Although not shown, in order to accelerate the pulping treatment in the container, it is preferable to supply high-temperature and high-pressure steam into the container. In that case, the steam is introduced into the supply port 12 and the discharge port 14. A valve (not shown) is provided to prevent the generated vapor from leaking. As such a valve,
For example, a pair of opening and closing valves are provided at the front and rear of the supply port and the discharge port, respectively, in the direction of the flow of waste paper liquid, and by alternately opening and closing those valves, the supply and discharge of waste paper can be performed while holding steam in the container Can be

[0023]

EFFECT OF THE INVENTION The pulping apparatus according to the present invention has the above-mentioned constitution, and the pulper as a crushing apparatus required as a pretreatment step for the aging tower in the above-mentioned conventional apparatus, A pump for feeding the waste paper liquid crushed by the pulper to the aging tower and a dehydrator for dehydrating the waste paper liquid supplied to the aging tower are not required, and therefore, the installation space for the pulping treatment device is not required. Can be significantly reduced.

Further, in the conventional apparatus, the waste paper is crushed by a pulper in order to make it possible to send it to the aging tower.
It must be a small piece of about 8 mm
The pigment coating and the printing ink for printing that are worn on the surface of the waste paper are miniaturized, and the subsequent filtering process and deinking process are difficult, but according to the device of the present invention, Since the used paper crushed by the crushing device does not need to be fed by the pump, it is not necessary to crush the used paper in such a fine manner, and therefore, the problems relating to the filtering process and the deinking process in the conventional device can be reduced. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a basic configuration of a used paper pulping apparatus according to the present invention.

[Explanation of symbols]

10 --- Pulping apparatus; 12 --- Supply port; 1
4 --- Ejection port; 16 --- Processing container; 2
0 --- Old paper crushing device; 22 --- Treatment liquid supply device; 28 --- Transfer device.

Claims (3)

(57) [Claims] 1. A supply port is provided at one end, and a discharge port is provided at the other end.
A substantially horizontal cylindrical processing container, a waste paper crushing device that is connected to the supply port of the processing container, receives waste paper, crushes it, and supplies it to the processing container through the supply port, The processing liquid supply device that supplies the pulp processing liquid to the supply port side, and the expansion from the supply port side to the discharge port side in the processing container.
Having a spiral blade set to
By rotating the blades, a transfer device that transfers the crushed and supplied waste paper and pulping treatment liquid from the supply port side to the discharge port side, and for promoting the pulping process in the processing container Supply steam
And the steam introduced into the processing vessel
Installed at the above-mentioned supply port and discharge port to prevent leakage.
A pulping apparatus for waste paper, which has a scraped valve . 2. The supply port is provided at an upper end of one end of the processing container.
And the outlet is set at the bottom of the other end
The pulp processing apparatus for waste paper according to claim 1. 3. The valve has a supply port and a discharge port, respectively.
In addition to this, a pair of open / close valves provided at the front and rear in the direction of waste paper flow.
The pulping treatment apparatus for waste paper according to claim 1 or 2, comprising: