TW552336B - Method and device for processing pulp - Google Patents

Abstract

The object of the invention is a method and a device for dispersing pulp, especially pulp containing waste paper, in which method ground pulp mass is fed between the blade surfaces of a dispersing device that are brought in a rotating movement in relation to one another. The invention is characterized in that the dispersing event takes place in a narrow opening between the conical surfaces at the outlet end of which there is arranged a running wheel acting as pump by which the pulp is pumped out of the dispersing device by centrifugal force. The inner cone of the dispersing device may act as rotor and the outer cone may act as stator. In addition, the pulp may be diluted at the outlet end of the blade opening with fluid introduced to the intake side of the running wheel.

Description

552336 V. Description of the invention α) The present invention relates to a method for dispersing wood fiber pulp, especially wood fiber pulp containing waste or recycled paper and including solid and liquid, wherein the refined pulp is fed into a dispersing device to rotate with each other Between the tool surfaces. The invention also relates to a dispersion device for implementing such a method. Wood fiber pulp is treated in a dispersing device in which contaminants in the pulp must be separated from the fibers without causing fiber damage during processing. This can be achieved with the assistance of two opposing tool surfaces in the dispersing device. One of the two tool surfaces in the dispersion device has a base plate (stator) that is stationary, while the other tool and its base plate (rotor) rotate relative to each other. The clearance between these two knives and the pulp causes the pulp to reciprocate in the dispersing device, thereby facilitating the removal of the contaminants from the fibers. The purpose of dispersion is usually to mechanically separate the pollutants from the fibers, while refining the pollutants into smaller particles, without affecting the properties of the fibers. Dispersion units are particularly suitable for treating pulp that includes waste or recycled paper and contains ink particles or contaminants such as adhesives and molten coatings. The specification of Swedish Patent Application No. 502,906 discloses a method and a dispersing device for treating such pulp. This specification describes a refining device which includes two refining discs facing each other. The disc is provided with a embossed tooth-like pattern, and the inclined embossed pattern is arranged radially on the disc. In addition to flat dispersers, cone-shaped dispersers can also be used. Despite this, a problem with the cone disperser is that it allows only a small pulp transmission force. Therefore, under the high pressure in the discharge volume, that is, under the high propulsion force in the sawtooth gap, it is difficult to adjust the working surface and increase the load of the dispersing device. Decentralized devices may even become blocked, causing processing interruptions.

Page 4 552336 The method of treating the wood fiber and using the method to make the range of operation as the best and pulp flow. The method of connecting the area ratio is to reduce the discharge capacity and reduce the load. ^ The cutter area force is avoided. Here, a smaller and more productive method is allowed to avoid this dimension pulp dispersion. It is used as an awl for dispersing the dispersion side of the extraction surface. On the frontal body, the device is vertical, and the device is installed to increase the device, that is, to install a square cutter that has a lower output force than that in the surface dispersion method, which is a problem. The dispersion occurred in Jiedu and placed in Zhidu. This device is used as a fixed external fixation unit to increase the pulp to 50% in the axial and plane direction. The dispersive energy tool surface ends the pressure impeller blades. The pressure at the front end of the valley chamber is low. It is preferable to use a dispersing device that has a number of tools, particularly a tool gap included between the tapered surfaces, and an impeller blade. # The flow deviates by 15% from the point of the vertical diffuser on the cone, so the force also increases. The operation can be adjusted by ’to distribute the load. Terminal pressure, so there are many hazardous dispersion devices that are blocked by the transmission force. Further, the description of the invention (2) The invention uses the present invention to discharge the end of the gap between the waste or recycled paper cutter of the present invention. The advantage is that the innermost cone wheel Yuan Yuan fixes the axis. The impeller blade guides the paper in the plane because its cutters and contaminants are reduced in the present invention. The pressure at the end of the installation can be reduced enough to cause suction problems towards the rear end. The risk rate is small. For example, on the working surface, to enhance the dispersion efficiency. In the rule of the present invention, the wood fiber pulp can be divided into a single impeller blade from a dispersing device. The outermost rotor, the conical axis of the rotating cone, and the conical surface of the rotating cone are scattered. The probability of contacting the plane is obvious. 'The impeller blade draws the paper into the discharge container

552336 V. Description of the invention (3) The pressure at the feed end of the cutter zone, that is, the feed pressure, can be significantly lower than the pressure in the discharge chamber of the dispersing device. This allows the pressure in the discharge chamber to be increased enough to allow the dispersed pulp to be conveyed via the pipeline to a height even higher than the dispersing device without the need for additional pumps. In this way, the method of the present invention can replace the method of mixing a dispersing device, a pump, a pump feed tank, and a spiral conveyor in some cases. The method of the present invention can further achieve excellent dispersing device performance and productivity, transfer pulp to subsequent processing steps, and if necessary, obtain appropriate hydrostatic pressure for the subsequent processing steps of the pulp. In other words, the method of the present invention consumes less energy than the conventional method. The hydrostatic pressure required to pump the pulp to the subsequent pipelines can be generated by a dispersing device or another pumping device. The pumping of the discharge container of the dispersing device is performed by using one or more impeller blades placed at the discharge end of the cutter gap. Therefore, in this method, dispersion and pumping are performed in different parts of the device so that the two do not interfere with each other. In addition, in the method of the present invention, the pulp can be diluted by using the feed liquid on the suction side of the impeller blade located at the discharge end of the cutter gap. This allows the pulp to be diluted for subsequent processing if necessary without any additional processing steps. Sufficient mixing can be provided in the discharge container for performing the dilution without the need for a separate mixer. The required dilution liquid may be pressurized or not pressurized, and it is fed from the suction end of the impeller blade through at least one feed conduit provided in the device. The invention further relates to a dispersing device for dispersing wood fiber pulp, especially pulp containing waste or recycled paper and including solid matter and liquid phase. The dispersing device of the present invention includes tapered surfaces facing each other and provided with a cutter, the two surfaces can rotate relative to each other; a feeding duct is used to guide the pulp into

Page 6 552336 V. Description of the invention (4) Tool clearance between two rotating surfaces; and a discharge container for unloading the broken pulp. The dispersing device is characterized in that the cutter surface is a tapered surface, and further includes an impeller blade disposed at the discharge end of the cutter gap. As described above, the dispersing device used according to the present invention is a cone-shaped dispersing device, which has the advantage of having a large operating range. Therefore, it is better to use the outermost cone as a stator, while the innermost cone is used as a rotor, and an impeller blade is additionally installed on the rotor. The impeller blades are preferably fastened to the cone as a rotor so that the pulp flow deviates from the cone axis. The cone dispersing device is superior to the plane dispersing device in that the number of cutters is increased by 50 to 150% compared with the plane dispersing device. Therefore, the contact probability between the cutter and the pollutant is significantly increased, and the dispersing performance is also enhanced. In addition to the above-mentioned advantages, the cone-shaped dispersion device can also achieve the following advantages: At the same known energy level, it produces higher pollutant dispersion efficiency than the planar dispersion device; pulp fiber breaks less, because the energy system is distributed in With a larger number of tools, it is possible to use higher energy than a planar disperser; the tools of the disperser have a longer operating life because of the larger working area and lower energy / tool. The cutter surface of the cone-shaped dispersing device may be inclined at an angle of 10 to 75 ° relative to the axis of the cone, preferably at an angle of 10 to 30 ° relative to the axis of the cone. The tool surface may also be composed of an adjoining cylindrical surface and a tapered surface, however, the tool is preferably located on the tapered surface. The tool is set on the moving tool surface (rotor), and the stationary tool surface (stator) overlaps the tool part. The shape of the tool is arbitrary, however, it should be sized so that the rotor and stator form a pair, and the tools are partially stacked. The design of the flow duct of the impeller blade can produce an increase toward the outer periphery of the impeller blade.

Page 7 552336 V. Description of the invention (5) Pressure (please compare with a centrifugal pump). The high pressure inside the pulp duct and its outlet prevents the pulp from recirculating from the discharge chamber to the cutter area. There is a gap between the impeller blade and the wall of the discharge container. This clearance allows the impeller blade to run freely, but it does not allow the pulp to be recycled and the pressure in the discharge container is not allowed to drop. In order to make the technical content, features, and effects of the present invention more multi-directional, a preferred embodiment is described below with reference to the drawings and figure numbers as follows: Feed conduit --- 1 cone --- 2 cone Face——3 Tool——4 Tool Clearance——5 Discharge End——6

Impeller blades --- 7 slurry flow conduits --- 8 discharge container chambers --- 9 diluted liquid feed conduits --- 10 gaps --- 11 Please refer to Figure 1 for the implementation of the dispersion device of the present invention A partial longitudinal section view includes a frame portion, a cone including most conical surfaces, an impeller blade, and a discharge container.

The wood fiber pulp containing waste or recycled paper with an appropriate viscosity between 15 and 35% is fed from the feed duct 1 to the cone dispersing device. When the pulp advances on the cone 2, it is simultaneously in the 4 blades. The conical surface 3 within the gap 5 moves back and forth. The negative pressure generated at the discharge end 6 of the cutter zone promotes the pulp to move forward toward the discharge end 6. The contaminants in the fiber pulp are mechanically separated from the pulp fibers in the cutter zone, and the contaminants are further refined into smaller particles. When the pulp moves to the discharge end 6 of the cutter area, it is mixed with the dilution liquid sent to the discharge end 6 through the dilution liquid feeding duct 10. The diluent can be pressurized or unpressurized. When the impeller blade 7 rotates, an air current is generated, which makes the pulp and diluted liquid

Page 8 552336 V. Description of the invention (6) Mixing. The rotating movement of the impeller blade also generates the above-mentioned pressure difference between different components of the device. The diluted pulp passes through the pulp flow duct 8 of the impeller blade and enters the discharge container 9 according to the principle shown in FIG. 2. The viscosity of the pulp in the discharge container 9 is suitably between 4 and 12%. Please refer to FIG. 2, which is a partial outline view of the structure of the impeller blade 7 and the slurry flow duct 8 of the dispersion device of the present invention, and also shows the operation principle of the slurry flow duct 8. This schematic diagram is also a cross-sectional view taken along line A A in FIG. 1. The impeller blade 7 has a slurry flow duct 8 extending axially outward, and the slurry flow duct 8 is defined by the component 12. The direction in which the pulp flow direction 13 occurs is deviated from the axis of the impeller blade 7 and is opposite to the rotation direction 14 of the impeller blade 7. The impeller blade 7 is fixed on the rotor and reverses the pulp flow direction 13 with respect to the cone axis. The impeller blade 7 and the wall of the discharge container 9 are separated by a gap 1. The gap 11 allows the impeller blade 7 to run freely, but does not allow the pulp to be recirculated or the pressure in the discharge container 9 to drop. Please refer to FIG. 3, which shows the surface structure of the cutter of the dispersing device of the present invention. The figure shows the positioning of the cutter 4 on the tapered surface 3. The tool 4 can be aligned with the shell line of the tapered surface 3 or positioned at a specific angle with the shell line of the tapered surface 3, and the shape of the tool 3 and the distance between them can be freely changed. The shape of the tool 3 in different areas can also be changed. For those familiar with such technologies, the method and apparatus for dispersing wood fiber pulp of the present invention is not limited to the examples provided above, but is based on the scope of patent application below. In summary, the present invention can indeed achieve the functions and effects described, and can provide industrial use. It is in line with the requirements of the invention patent, and it is proposed according to law.

552336 V. Description of the invention (7) The patent application is clearly stated. It is really a prayer to ask Jun Bureau to grant the patent.

Page 10 552336 Brief description of the drawings The first diagram is a partial longitudinal sectional view of a dispersing device implemented in the present invention. The second diagram is a partial schematic diagram of the impeller blade structure and the slurry flow duct of the dispersing device of the present invention. The principle of the operation of the slurry flow duct; this partial outline diagram is a cross-sectional view along the line AA in FIG. 1. The third diagram shows the surface structure of the cutter of the dispersing device shown in FIG. 1.

Claims (1)

552336 Case No. 89119283 Amendment VI. Patent application scope: within the cutter gap between the faces; and a discharge container for removing the dispersed pulp; it is characterized by the tapered surface of these cutters and the device additionally The utility model comprises an impeller blade which is arranged in a discharge container chamber of the cutter gap. It includes one or more > its cone surface and cone where the cutter system is 9. The dispersion device as described in item 8 of the scope of patent application, a dilution liquid feed conduit. 10. The axis of the dispersing device according to item 8 of the scope of the patent application is at an angle of 10 to 75 °. 1 1. The dispersing device as described in item 8 of the scope of patent application is on the cone surface and partially stacked. 1 2 · The dispersing device according to claim 8 in the scope of the patent application, wherein the cutter surface includes an adjacent cylindrical surface and a conical surface. 13. The dispersing device according to item 8 of the scope of the patent application, it is preferable that the taper surface is at an angle of 10 to 30 ° with the cone axis. Page 13