JPS5921708A - Used paper regenerating method and apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has the following features:
The present invention relates to a method for FIT production of waste paper with a process of FIT processing and a convenient device V1'' for carrying out this method.

Basically, in the +If production device i'i, which was conventionally taken depending on the state of the technique, /ζ rotation sentence /J
A centrifugal sorter is a device in which a vortex rotating entirely around water 'I' 11Il+ in a container named 11Il+ is produced by an impeller consisting of a rotating shaft coaxial with it, combined according to its mode of action. /Secondary pulp l1iI l'
It plays an important role and is regarded as a machine. Due to this vortex flow, the fraction containing heavy pollutants can be discharged around the radial direction of the vortex flow, and the fraction containing heavy pollutants can be discharged in the radial direction of the vortex flow.
Then, it is possible to introduce a tJ+ outlet pipe into the center of the vortex where the fraction containing light pollutants β,- is collected, and from the discharge pipe this fraction can be discharged from the apparatus. Furthermore, the separation of high-quality paper stock fractions is carried out outside the vortex],! This is done by means of a screen which is provided at the rear of the vortex and is generally perpendicular to the axis of rotation of the impeller and the vortex.

However, this centrifugal sorter device is already supplied with a prewashed cellulose suspension of waste paper. This is explained in British Patent No. d'1-Specification No. 1:340998 on the basis of FIG. 3 thereof. Further there, strings and tapes and other filamentous contaminants are discharged as a cohesive mass by means of a twisting winder, which likewise operates according to the source B11 of the vortex and in the center of the vortex, on the packaging material lI','l. A pulp disintegrator is used. Fiber k? The pre-cleaned fraction of the turbid liquid passes through a screen placed behind the rotor and is discharged from a separate discharge chamber.

Another currently known method for eliminating the discharging of lumps by means of so-called twist winders is to use the above-mentioned pulp disintegrators and the above-mentioned pulp disintegrators in order to separate the above-mentioned particularly filamentous and high-surface-area contaminants before feeding them into the centrifugal notter equipment. At least two further notter devices are connected to the centrifugal sorter device.

More preferably, a drum is used which rotates around a very large horizontal axis with a perforated peripheral wall (DE 30 26 136). However, this is very expensive due to its unavoidable size. On the other hand, since the discharge of the lump has a very strong tendency to make the operation irregular and seriously hinders the whole regeneration process as a serious weakness, it is necessary to replace the original lump with a 91% replacement. found. Problem-free operation with the evacuation of lumps is only possible if a specially placed operator monitors the operation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a reliable regeneration method that eliminates the aforementioned large-volume and expensive horizontal sorter drums.

This object is solved according to the invention by a method of the type mentioned at the outset with the features of the characterizing part of patent claim (1).

Particularly advantageous further developments of the method are given by patent claims (2) and (3).

A particularly advantageous device for carrying out the method emerges from the patent claims.

According to the invention, a completely new method of operation of known centrifugal sorter devices is used. In this case, unwashed and disintegrated wastepaper material is fed to the device in a batch operation in such a high concentration that at least some of it cannot be pumped up. Thus, all intermediate washing steps that were conventionally arranged before the centrifugal notar device mentioned above;
be excluded. This creates a very compact and reliable regeneration method. A later screening step, as is common in the prior art, should of course also be provided in this case.

In addition to water, at least a portion of the prescreened and diluted suspension discharged from the pulp disintegrator can also be used as diluent.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described by way of an embodiment shown in the accompanying drawings.

In the drawing, reference numeral 12 indicates a pulp disintegrator, and reference numeral 1 indicates a notter device connected after the pulp disintegrator, which generates a vortex rotating around a horizontal axis (see streamlines). There is. Here, the sorter device 1 constituting the vortex device is connected immediately after the pulp disintegrator 12 and connected thereto by a short discharge pipe 15 with a large cross section.

The vessel of the pulp disintegrator 12 has a rotating mechanism 16 pivotally mounted on its bottom wall 28 which is provided with stirring blades 17 .

This rotation mechanism 16 rotates about Ill+ 26 which is inclined slightly, ie at a small acute angle with respect to the vertical. The lower part of the vessel of the pulp disintegrator 12 is tapered and has a discharge chamber 29 separated from the rest of the vessel by a screen 18.
A high-quality paper stock υI outlet pipe 14 and a dilution water pipe 37 are connected to.

The screen 18 is inclined relative to the horizontal at the same acute angle as the rotation mechanism relative to the vertical. Discharge pipe 1
This is connected to the deeper parts of the lower container area, since through this 5 particularly heavy materials, ie pollutants with a larger volume and specific gravity, are also to be discharged.

The same applies analogously to the connection of the quality stock discharge pipe 14 to the discharge chamber 29.

In the case of the above-mentioned arrangement, a high pulp concentration is developed in the pulp disintegrator 12, preferably C1, which can be between \I5 and 20% and in particular \\16%13, so that the volume of the container is kept relatively small. Therefore, in order to improve the discharge, dilution water is added into the discharge chamber 29 through the dilution water pipe 37 so as to at least adjust the pulp density below 8.

In the case of the embodiment described above, the quality paper N:'+4:11 outlet pipe 14 and the other discharge pipe 15 are each equipped with a slide valve 24,35 for completely shutting it off. . Although it is possible to discharge the quality stock continuously or periodically, the discharge pipe 15 of the heavy material reservoir must be opened periodically.

It is shown that the waste paper is fed to the .zeta. pulp disintegrator via a belt conveyor system 40.

The rotation mechanism 16 of the pulp disintegrator I is driven by a motor 22 via drive discs 31 and 25 using a drive bell I-. This is also possible via a Cardan axis. The slide valves 24 and 35 are driven, for example, by the slide valve 3.
This can be done by a hydraulic adjustment motor such as the one shown at 27 for 5. .

For the rotation mechanism 16, preferably an arrangement in the form of stirring blades 17 constituting a multi-screw conveyor is used. Further, a plate 3 supporting the stirring blade of the rotating mechanism 16:
(An embodiment in which the lower side is provided with ribs 32 which serve to thoroughly mix the suspension with the water supplied by the dilution water pipe 37 in the lowermost container area, in particular in the discharge chamber 29, seems most suitable) In order that significant dilution of the suspension does not occur in the region of the disintegrator above the plate 33, this plate 33 practically avoids the dilution sorter and discharge chamber 29 below it. From the container area of 1 (parts, rib 32
The rotational action of the plate 33 can be effected, if necessary, by the use of an additional weir element, such as a weir wall disposed in the vicinity of the rib 32 and radially outwardly from it. Limited to the areas mentioned above.

The strings and wires for wrapping the unsorted waste paper introduced into the pulp disintegrator 12 tend to form clumps on their own or with other contaminants, which clumps are easily removed from the pulp with the aid of dilution water. Discharged from the disintegrator.

The centrifugal sorter is designated by l in the drawings. Therein, in front of a substantially flat screen 30 separating the discharge chamber 8 for fine stock from the remaining container chambers,
The rotor 2 rotates around 1 lql+ horizontally. In this sorter device a horizontal vortex with +lql+ 2 is formed, in the center of which light pollutants and heavy pollutants collect respectively on its radial circumferential wall. They can be discharged separately from this region, and this applies in particular to the heavier fractions. The heavy power fraction is discharged via pipe 1 (). The center of the sorter device, i.e., δ (i)
+, 1 Jt outlet pipe 4 is injected, through which the fraction containing light substances is discharged to JJ1! A further tube 5 is provided at 11+, through which dilution water can be supplied close to the area of the rotor 2. Since a cellulose suspension with a relatively high concentration of, for example, 12φ is introduced through the discharge pipe 15 by batch operation, the average concentration in the soaking device 1 is brought to below 5゛5φ by dilution water. will be satisfied.

In this case, the tube I5 is placed close to the end face of the sorter device, and
As shown in the figures, it is advantageous to actually introduce the suspension into the vortex in the axial direction.

Thus, decomposition of the waste paper mass with high concentration occurs,
Vortexing prevents streak-like mixing with highly concentrated cellulose suspensions.
be done. In this way, a relatively uniform vortex is created.

The vortex tube 7, which is a hollow cylinder mounted in the center of the rotor 2, provides a particularly strong indication of the center of the vortex containing light material (lamellae).

Advantageously, as shown, the fraction containing light contaminants is discharged from the Noter device through the central tube 5. The discharge of the fine abrasive wheel which has passed through the screen from the discharge chamber 8 is carried out via a pipe 9.For further details of the discharge of the different fractions, reference is made to the above-mentioned British patent specification.

Regarding the method of operation of the device according to the invention, it should be noted that 4. The sliding valves 35 and 24 are preferably and as for the sliding valve f35 necessarily operated cyclically. At this time, the sliding valve 2 for relatively clean pulp with a relatively low concentration of 8% or less after 10 shakes.
The operating frequency of 4 is moderately higher than the operating frequency of the sliding valve 35.
It is much thicker than the cross section of. In this case, the actuation of the slip valve is time-controlled according to known methods. A suitable device for this time-dependent control reservoir is relatively inexpensive and reliable in operation. Therefore, the method of operation according to the method of the invention does not cause any troublesome AIF.

Monitoring is relatively simple and automated.

Overall, the method according to the invention makes possible a very simple, reliable and low-cost method for recycling waste paper.

[Brief explanation of drawings]

The drawings are schematic diagrams showing one embodiment of the present invention. ■････････････････････････････････････････････････････････････････････････････････.
... Screen, 4.15 ... Discharge pipe, 5.9゜1
0...Pipe, 7...Eddy current tube, 8, 29...Discharge chamber, 12...Pulp disintegrator, 14...High quality paper stock discharge pipe, 16... Rotating mechanism, 17... Stirring device, 22... Motor, 24.35... Slip valve, 25I31... Drive disk, 2G... Shaft,
27...adjustment motor, 28...bottom wall, 32...
...Rib, 33...Plate, 37...Dilution water 140
...Bell (conveyor device) Agent: Yasushi Shinohara 30, patent attorney

Claims (9)

[Claims] (1) In a device (centrifugal sorter) with a closed container that is substantially rotationally symmetrical, a vortex formed by a rotor configured substantially like an impeller is used to reduce the weight at its radial edge. At the axial end of which there is a rotor which produces a turbulent stream, the quality stock fraction is discharged through a screen closely adjacent to the rotor, so that the average concentration in the vortex is 3. .In the process of recycling waste paper by disintegration in a pulp disintegrator at high concentrations between 5 and 7%, the contaminant-aging part of the suspension is diluted only slightly if necessary. , pumped with a concentration of 8% or more
1. A method for recycling waste paper, characterized in that it is fed directly from a pulp disintegrator to a vortex in a batch operation without being screened in an active state, and an additional diluent is introduced into the vortex. (2) The other part of the suspension is also diluted from the pulp disintegrator and fed into the vortex! I', seven signs, I
Particularly i'l' The method according to claim (1). (3) A method according to claim 1 or 2, characterized in that the diluent is introduced at least closely adjacent to the vortex center. (4) Claim (1) characterized in that the diluent is introduced in the vicinity of the rotor (2) of the vortex device (1).
The method described in any of (3) above. (5) The suspension is supplied into the vortex by a vortex rotor (2
4. The method according to any one of claims 1 to 4, characterized in that the method is carried out at an axial end remote from ). (6) The fraction discharged from the pulp disintegrator (6) through the screen 08 extending below the rotor 00 is
Claims (1) to (5) characterized in that the dilution water is brought up to a concentration that can be pumped by a pump + 1 J, and is discharged in a batch operation and supplied to the vortex flow.
The method described in any of the above. (7) Concentrically to the extraction tube (4) of the distillate reservoir containing light pollutants in the center of the vortex, a supply of dilution water reservoir 'i'i' (5) flows into the vortex device (1). A vortex device for carrying out the Noj method according to any one of claims 1) to (6). (8) A material inlet according to claim (7) is characterized in that one raw material inlet is attached to the vortex device (1) at an Aij opposite to the quality paper extraction chamber (8). Vortex device. (9) A waiter, characterized in that the discharge pipe (4) and the supply pipe (5) are arranged in the center of the longitudinal axis of the vortex device.
The vortex device according to scope (8) of the f'11 request.