DE3238742A1 - Process for the sorting of fibre material, especially for paper making, and sorting apparatus for carrying out the process - Google Patents

Abstract

The sorting apparatus has a rotor (6) with blades (8, 10) which move along a screen (3) located underneath the rotor (6) and forming a part surface of a surface of revolution. The fibre mass (O) which has not passed through the screen (3) is thrown up into an eddy space (11) by the rotor (6) and falls back onto this again. A curved guide surface (12) is provided for guiding the fibre mass (O). <IMAGE>

Description

Process for sorting pulp, in particular for

the production of paper, as well as sorting device for execution of the method The invention relates to a method for sorting pulp, especially for the production of paper, in which the pulp is combined with liquid in a housing is moved by a rotor, whereby the flow material is discharged from the housing through a sieve.

At the same time, the invention relates to a sorting device for execution the method with a housing with a sieve and a rotor assigned to the sieve, which has blades which move along the screen.

There are many different sorting devices that can be used according to the method work of this kind and e.g. to break down pulp obtained from waste paper and for the elimination of surface contaminants, such as e.g.

Plastic films, from the waste paper pulp are used. As an example one such a device is mentioned in US Pat. No. 3,942,728.

The invention has to provide a novel method and method associated device to the target, which compared to the known devices a number of advantages having. So the fiber should be simple Way, with little energy consumption in a pressureless and therefore cheap housing can be processed, with pieces of foils located in the fiber mass are little or not crushed and can be excreted. The procedure and the device should be equally suitable for processing from waste paper obtained pulp, which is used for the production of new paper, as well for dissolving and sorting or fractionating new pulp.

The method according to the invention, by means of which this goal is achieved is characterized in that the pulp is produced by the rotational movement of the Rotor from the area of the rotor into one located outside the area of the rotor, one The air space forming the vortex space is thrown and then back into the area of the same or a different rotor through which the pulp of new is thrown away.

The sorting device according to the invention for carrying out the method is characterized in that the housing with the sieve has the shape of a trough has, in the lower area of which the 'sieve forms a partial surface of a surface of revolution, which has a horizontal or inclined axis and in the area of the cylinder axis the Shaft of a rotor is arranged, which has at least one blade which in the vicinity of the sieve and is suitable for clearing the sieve, whereby outside the area of the rotor there is an air space, which is a vortex space forms and in which the mass containing the fibers is thrown from the rotor and can thereby be swirled.

The process and the sorting device both have the same process in common, that the pulp mass is thrown away by a rotor and swirled intensely will. During this process, dissolved fibers are drained away through the sieve at the same time and form the continuous stock, in this case the accepted stock. Unresolved parts that e.g. found in waste paper are eliminated.

In a simple embodiment of the method, the pulp thrown upwards by the rotor and falls back onto the same rotor, whereby the flow material is diverted through the sieve below the rotor.

The pulp can, however, also from another rotor to the first Rotor can be thrown back.

In the sorting device according to the invention, the rotor can next to Shovels, which are used to clear the screen, also have shorter blades that serve to spin the mass of the pulp. In principle, the Räumschaufeln can also take care of the hurling of the bulk of the pulp. It however, it has been shown that shorter blades spaced apart from the Move the sieve, throw the mass against the sieve at a steeper angle, what for the sorting process is advantageous.

The blades, namely the scraper blades as well as the Centrifugal blades, perpendicular to their direction of movement. The axial movement the pulp mass in the device must in this case by other means, e.g. by tilting the housing.

However, there can also be at least one of the blades opposite the Direction of movement be inclined in such a way that it causes a movement of the pulp mass influenced in the axial direction of the rotor.

In a preferred embodiment, a can over the rotor Deflection surface are located, which are used to deflect the pulp mass thrown away by the rotor is used back in the axis area of the rotor. Through this measure, the movement the swirled mass is directed in such a way that it counteracts at a favorable angle the sieve can be thrown.

For this purpose, the deflecting surface can move in the direction of movement of the pulp mass be arched, being provided with guide ribs for the pulp can.

Preferably adjustable on the ejection side of the rotor Move guide ribs according to their setting angle to the direction of movement of the pulp mass a movement of the pulp mass in the axial direction of the rotor influence. By adjusting these ribs, the throughput speed the pulp mass can be controlled by the device.

Outlet openings can be distributed on the housing in its longitudinal direction be arranged for water. In this way, the device located in the device Pulp mass are flushed and diluted.

For the same purpose, the shaft of the rotor can be hollow and connected to a Supply of water to be connected, with outlet openings for the water in the shaft are formed.

In a further embodiment of the invention, in the housing another rotor are located, the axis of which is parallel to the axis of the first rotor.

This rotor can preferably be located in the air or vortex space. These measures result in a particularly intensive swirling and processing the pulp mass obtained.

The housing can also in all of the mentioned embodiments with a Feed trough be provided with overflow edge, the feed trough above the housing is arranged with the rotor and extends parallel to its axis. To this A uniform distribution of the supply, be it of water with pulp mass, is wise or water alone, for the length of the device.

The feed trough can preferably extend over more than half of it the axial extent of the housing extend.

With smaller consistencies of the supplied pulp mass is on this way you get a flush with your own liquid, usually water, the supply of additional water only in the following part of the device is required.

The invention is illustrated schematically with the aid of some of the drawings Examples explained. There are shown: FIG. 1 a schematic longitudinal section of an inventive Device, FIG. 2 a section along the line 11-11 in FIG. 1 on a larger scale Scale, 3 shows a corresponding section along the line 111-111 in FIG. 1, FIG. 4 a detail from FIG. 2 with a different embodiment the deflection surface 'FIG. 5 shows a representation corresponding to FIG. 3 of another Embodiment, Fig. 6 is a view of a further embodiment of the machine According to FIG. 1 and FIG. 7, the view with partial section along the line Vil-Vil in FIG FIG. 6, FIG. 8 a further embodiment of the machine according to FIG. 6, the FIGS. 9 and 10 show two schematic sections of further possible embodiments of the machine according to the invention and FIG. 11 a schematic representation of a at an angle to the direction of movement of the shovel Figures 1 to 3 includes a housing 1 in the form of a trough, which a Has partial surface 2 of a cylinder with an axis A. In the present case it is the part surface is semi-cylindrical and formed by a sieve 3. To the cylinder surface 2 are connected to vertical walls 4 and 5, which with the sieve 3 the trough of the Form housing 1. A rotor 6 is arranged coaxially to the cylinder axis A of the sieve 3, which has a hollow shaft 7 as well as blades 8, 9 and 10. The blades 8 extend to the vicinity of the sieve 3 and are used to clear the sieve suitable during a rotary movement of the rotor 6.

Above the rotor 6 there is an air space serving as a vortex space 11, which is closed at the top by a deflection surface 12. In the example shown the deflection surface 12 is curved so that it slides along, from the rotor 6 into the Height thrown pulp mass returned to the area of the axis A of the rotor 6 will.

As can be seen from Figures 1 and 3, the deflection surfaces 12 provided with guide ribs 13 for the pulp mass thrown off by the rotor. In the example shown, the ribs 13 lie in planes perpendicular to the A axis. However, they can also be inclined, i.e., in a helical manner, in order to thereby moving the pulp mass in a desired direction, e.g. B. to the exit to support the substances to be excreted from the housing.

As can be seen in particular from FIG. 3, the housing is 1 provided with supply lines 14, 15 for water, from which nozzles 14 ', 15' in open into the interior of the housing 1. On the ejection side of the rotor 6, which by whose direction of rotation (see arrow) is given is located in housing 1 on the vertical wall 5 a number of adjustable guide ribs 16, corresponding to the representation in FIG. 1 can be inclined with respect to the axial direction of the rotor 6 are. The guide ribs 16 influence the movement of the pulp mass in the axial direction Direction of the rotor 6.

As can be seen from Figures 1 and 3, is for the supply of pulp to be sorted a feed pipe 17 provided that is carried out through the deflection surface 12.

At the left end in Figure 1 is the device with an exit shaft 18 provided for the overflow, which has not passed through the sieve. An overflow edge is located between the sieve 3 and the outlet shaft 18 20th

Below the housing 1 is a collecting container 21 for the Sieve 3 passed through flow material arranged.

The collecting container 21 as well as the housing 1 are on a support structure 22 attached, which at the same time carries bearing blocks 23 for the shaft 6. The wave 6 is connected to a drive motor 25 via a coupling 24. Like from the As can be seen from FIG. 1, the rotor 6 has a disk-shaped arrangement perpendicular to its axis Partitions 26 are provided which separate sections of the blades 8 and 10 from each other separate. The blades 8 and 10 are offset from one another between the partition walls 26, as can also be seen from FIG. This will make the Obtained torque when driving the rotor.

In operation, the rotor 6 by the drive motor 25 in a relatively high speed suitable for spinning the mass. If partially resolved Waste paper pulp is to be processed, this is e.g. through a pulper the feed line 17 is introduced into the housing 1. By turning the rotor 6 this mass, which already dissolved paper fibers as well as flat parts, e.g. contains lumps of paper, pieces of film, etc., as well as a proportion of water, first thrown against the sieve 3, so that some of the fibers through the sieve into the Collecting container 21 can get. The not- stepped through part is captured by the scraper blades 8, thrown into the air and slides along the Guide surface 12 again in the area of the rotor 6, whereupon this process repeated. This creates a very intense swirling of the mass, whereby this under the influence of the adjustable guide strips 16 to the exit shaft 18 moves. During this turbulence and movement, on the one hand, free paper fibers are created excreted through the sieve 3 and further dissolved undissolved pieces of paper.

Pieces of film, however, remain on the screen 3 and are swirled practically not crushed any further. Ultimately, they come in as overflow the exit shaft 18.

In the same way, pulp or wood pulp can also be used for the production of paper in the device. In this case it will be in a pulper The pulp suspension formed is introduced into the container 1. You can either Contamination, such as wood splinters, as overflow through the exit shaft 18 are eliminated.

As before, the fibers forming the continuous fabric get into the Collection container 21. The pulp or wood pulp can, however, also with the present Device can be fractionated if the perforation of the screen 3 is appropriate is chosen. Here, shorter fibers can pass through the sieve 3 in reach the collecting container 21, while the longer fibers form the overflow material and get into the output shaft 18.

Figures 4 and 5 show further possible embodiments of the Guide surface 12. The guide surface 12 according to FIG. 4 is much shorter, than those according to Figures 2 3.

The Fürungsrippn 13 can be omitted.

According to Figure 5, the guide surface 12 is by an arcuate Insert 12 'and a flat cover 12 "are formed. Under certain circumstances, the insert 12 'is even omitted.

On the basis of the icJur 5, the mode of operation of the device are explained in more detail.

The paserstoft mass is in the container 1 in the direction of the fully drawn or arrow P shown in dashed lines and enters the axis area of the rotor 6.

It is then picked up by the blades 8 or 10 and against the Sieve 3 thrown. By feeding into the axis area of the rotor 6, the possibility get that the supplied mass gets between the blades so that they of the shorter blades 10 serving to hurl in the direction of the arrow R is thrown against the sieve 3 at a relatively steep angle. Through this on the one hand, the dissolution of paper fibers that have not been completely dissolved is supported, on the other hand, the penetration into the openings already on dissolved paper fibers of the sieve 3 and through it. The longer blades 8 participate also in this centrifugal effect, but its main task is clearing the sieve, as indicated by the paper pulp 0 pushed by the lower shovel 8 is.

In the embodiment of the device according to FIG. 6, which is shown in FIG The rest of the device corresponds to the device according to FIGS. 1 to 3, is the feed pipe 17 replaced by a feed trough 30. The feed trough 30 has an overflow edge 31, above which the mass falls into the housing 1.

As can be seen from FIG. 6, the feed trough extends 30 over a length M of the part of the housing 1 provided with the screen 3, which is greater than half of it.

The remaining section N is provided with feed lines 14 for water. With this arrangement, the screening process in section M is only under the influence of the water contained in the supplied mass. With freshly supplied Water from the lines 14 only rinsed the overflow substance that is then in the Exit shaft 20 arrives. It goes without saying, however, that when the material is supplied With a higher consistency, feed lines for water are also arranged in section M. could be.

Figure 8 shows a device with a housing 1, which is symmetrical is formed and has an exit shaft 20 in the middle. Corresponding two collecting containers 21 are provided.

Figures 9 and 10 show two possible embodiments of the device with two rotors with parallel axes. The embodiment according to Figures 1 to 3 corresponding parts are denoted by the same reference numerals.

In the embodiment according to FIG. 9, it is located in the housing 1 above the rotor 6, a second rotor 40, which can be designed similarly to the Rotor 6. This serves to throw back what is thrown up by rotor 6 Pulp mass back onto the rotor 6.

A similar effect is found in the embodiment according to the figure 10 instead, but with two identical rotors 6 on same height are provided, which both interact with sieves 3.

Finally, FIG. 11 shows a possible arrangement of the blades 8 or 10 on shaft 7 of rotor 6. Here the blades are at an angle to the axis A of the shaft 7 employed. This will facilitate the transport of the treated pulp in the axial direction of the housing 1 to the output shaft I supports so that under Under certain circumstances, the adjustable guide ribs LG can be omitted. On the other hand you can they blades and the guide ribs act in opposition, creating the axial Movement of the mass in the device is delayed or an internal overturning movement can be achieved.

In FIG. 5 there is also a further possibility of supplying water indicated in the container 1. So the cavity 7 'of the shaft 7 of the rotor 6 can a water pipe, not shown, must be connected. The shaft 7 is then with Holes 7 "provided through which the water can flow out to the outside.

It is understood that the screen 3 is not in the form of a semi-cylindrical Need to have area, as shown in some of the figures. It can, as in Figure 5 also have planar sections 3 'that are attached to the cylindrical Connect surface. On the other hand, the cylindrical formed by the sieve The area can also be smaller than a half cylinder, as shown in Figure 10, for example. After all, the sieve does not need to be cylindrical, it can generally be have the shape of a surface of revolution. For example, it can be conical or made up of several be composed of cylindrical section of different diameters.

Pulp with high consistency can be separated from the device be supplied by water. In the embodiment according to Figures 6 to 8 can in this case, the trough 30 serve to supply water, while the pulp mass can be supplied separately e.g. by pipes of the type of pipes 17.

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Claims (17)

Claims.) Method for sorting pulp, in particular for the production of paper, in which the pulp together with liquid is moved in a housing by a rotor, the flow material from the Housing is diverted through a sieve, thereby g e k e n n n z e i c h -n e t that the pulp from the area of the rotor into one by the rotating movement of the rotor air space outside the area of the rotor, forming a vortex space is thrown and then back into the area of the same or another Rotor arrives, through which the pulp is thrown away again. 2. The method according to claim 1, characterized in that the fibrous material is thrown upwards by the rotor and falls back onto the same rotor, whereby the flow material is diverted through the sieve below the rotor. 3. The method according to claim 1, characterized in that the fiber material is thrown back onto the first rotor by another rotor. 4. Sorting device for performing the method according to claim 1 with a housing (1) with sieve (3) and a rotor assigned to the sieve (3) (6), which has blades (8, 10) which move along the screen (3), in that the housing (1) with the sieve (3) die Has the shape of a trough, in the lower region of which the sieve has a partial surface (2) of a Forms surface of revolution, has a horizontal or inclined axis (A), being in the area the Cylinder axis (A) the shaft (7) of a rotor (6) is arranged, which at least has a shovel (8) which extends in the vicinity of the sieve (3) and for clearing of the sieve (3) is suitable, whereby outside the area of the rotor (6) an air space is located, which forms a vortex space (11), and in which the the mass containing fibers (0) are thrown from the rotor and thereby swirled can. 5. Sorting device according to claim 4, characterized in that the rotor (6) in addition to blades (8), which are used to clear the sieve (3), too has shorter blades (10) which are used to spin the mass (0) of the pulp to serve. 6. Sorting device according to claim 5, characterized in that the blades (8, 10) are parallel to the rotor axis (A). 7. Sorting device according to claim 5, characterized in that at least one of the blades (8, 10) is inclined with respect to the rotor axis (A), such that they cause a movement of the pulp mass in the axial direction of the rotor (6) influenced. 8. Sorting device according to claim 4, characterized in that there is a deflection surface (12) above the rotor (6), which is used to deflect the pulp mass (0) thrown up by the rotor (6) back into the axis area of the rotor (6) is used. 9. Sorting device according to claim 8, characterized in that the deflection surface (12) is curved in the direction of movement of the pulp mass (0). 10. Sorting device according to claim 9, characterized in that the deflection surface (12) is provided with guide ribs (13) for the pulp mass (0) is. 11. Sorting device according to one of claims 4 to 10, characterized characterized in that there are adjustable guide ribs on the ejection side of the rotor (16) are located, which cause a movement of the pulp mass (0) in the axial direction of the Influence the rotor (6). 12. Sorting device according to one of claims 4 to 11, characterized characterized in that distributed on the housing (1) at intervals in its longitudinal direction, Outlet openings (14, 14 ', 15, 15') for water are arranged. 13. Sorting device according to one of claims 4 to 12, characterized characterized in that the shaft (7) of the rotor (6) is hollow and connected to a supply of water is connected, with outlet openings (7 ") are formed in the shaft (7). 14. Sorting device according to claim 4, characterized in that there is another rotor (6, 40) in the housing (1), the axis (B) of which is parallel runs to the axis (A) of the first rotor (Fig. 9, 10). 15. Sorting device according to claim 14, characterized in that the rotor (40) is in the air or vortex space (11) (Fig. 9). 16. Sorting device according to one of claims 4 to 15, characterized characterized in that the housing (1) has a feed trough (30) with overflow edge (31) is provided, the feed trough (30) above the housing (1) with the rotor (6) is arranged and extends parallel to its axis (A). 17. Sorting device according to claim 16, characterized in that the feed trough (30) extends over more than half the axial extent of the housing (1) extends.