JP2001348791A - Method for dispersing pulp paper material and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for enabling the supply and conveyance of a pressed plug material having a high viscosity and coming from a screw press to a dispersing machine so as to insure an especially uniform dispersion with a high operating reliability. SOLUTION: This method for dispersing the pulp paper material of a type consisting of a process for preparing a water-containing pulp paper material S1, a process for squeezing out a part of water content W for generating a high viscosity block-shaped pulp paper material S2, a process for conveying the high viscosity pulp paper material S2 into the dispersing machine 4 and a process for dispersing the above high viscosity paper material with a dispersing machine equipped with at least 2 groups of dispersing tools 5, 6 consisting of a plurality of teeth rows biting each other and relatively moving by taking an interval to each other for performing the dispersion treatment to the pulp material, is provided by supplying the high viscosity block state pulp paper material S2 before its dispersion into a working zone of a rotary beating roll 1 equipped with a plurality of circulating beating rods 2 and working the above beating rods 2 together with a plurality of colliding pieces 3 positioned as fixed around their periphery so as to give relaxing and homogenizing treatments to the above high viscosity pulp paper material S2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a process for preparing a hydrated pulp stock as defined in the preamble of claim 1 and a process for producing a highly viscous, massive pulp stock. Squeezing a part of the water, transferring the highly viscous pulp stock to the dispersing machine, each consisting of a plurality of intermeshing teeth and moving relative to each other at intervals. Dispersing the high-consistency pulp stock with a disperser having at least two dispersing tool sets for dispersing the high-consistency pulp stock, and carrying out the method. Related to the device.

[0002]

BACKGROUND OF THE INVENTION Processes of the above type are used, for example, for improving the quality of stock obtained from waste paper. It is known to homogenize pulp stock by dispersion, thereby significantly improving quality. This produces a highly viscous stock with a dry content of 15-35%. In many cases,
Dispersion takes place at temperatures far above the ambient outside temperature. The dispersing tool set which implements this type of method is compact and has a pronounced dispersing action. This significant dispersing action, of course, assumes that a uniform stock flow flows through the dispersing tool set. Since the stock stay time between the dispersing tool sets is very short, it is not possible to compensate for the unevenness of the stock flow. This results in unequal dispersion.

When carrying out the thickening process, most of the water still present in the stock is squeezed out, whereby firstly the consistency of the stock is significantly increased during dispersion, and secondly, In some cases, a small amount of water must be heated together. A particularly economical machine for concentration is a screw press. In the case of a screw press, the stock suspension is squeezed between the conveying screw and the perforated peripheral wall surrounding the conveying screw, whereby the water flows out through the holes in the peripheral wall. The resulting semi-finished product or press plug is extruded from the screw and breaks into partial masses. The sub-mass is relatively large and therefore passes through the downstream equipment in an uneven volume flow.

[0004] Published German Patent Application 197
A dispersion device in which a press plug produced from a screw press is fed directly is known from DE 12 653 A1. The press plug is then crushed by a grinding tool with a scraper or a knife blade located at the inlet of the disperser.

[0005]

It is an object of the present invention to feed a high-viscosity press plug coming from a screw press to a dispersing machine in such a way as to ensure a particularly even distribution with high operating reliability. It is to provide a method and an apparatus which make it possible.

[0006]

According to an aspect of the present invention, which fully solves the above-mentioned problems, a high-consistency bulk pulp stock is circulated before dispersion, as described in the characterizing part of claim 1. Feeding to the area of action of a rotating beating roll with a plurality of beaters, the beaters are cooperated with a plurality of impacting pieces fixed around to loosen the high consistency pulp stock and The point is that equalization processing is performed.

[0007]

The novel process according to the invention makes it possible to produce highly viscous stocks which are perfectly processed in a dispersing machine. The beating roll used in the present invention receives the press plug compressed by the squeezing of water, and in particular, a circulating beating rod cooperates with a collision piece fixed to the inner peripheral wall of the casing of the beating roll. By working, the press stopper is divided. The relatively large lumps remain long in the processing zone until they can pass through, so that the stock flow to the disperser is significantly more uniform. The stock stream is then further comminuted and swirled in the radially inward region of the dispersing tool set, resulting in significantly finer stock debris. If desired, steam is supplied into a heating zone downstream of the dispersing tool set to heat the stock to the required temperature. In the case of the heating, the heating time is relatively short based on the preceding grinding. The actual dispersion, i.e. the change in stock properties, takes place in the dispersion zone of the dispersion tool set that follows downstream.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows, in part, a dispersion apparatus which is particularly suitable for carrying out the method according to the invention. In the screw press 8 shown in the upper part of the drawing in FIG. 1, most of the water W is squeezed from the hydrated pulp stock S1. This produces a compact, compacted, highly viscous stock S2 which breaks into large chunks at the end of the press section and passes through a short drop tube 10 and is located below the drop tube. Into the dividing device 9 to be divided. The splitting device includes, as an important component, a beating roll 1 to which a plurality of refining bars 2 circulating are fixed. The beating roll 1 is
In short, it cooperates with a plurality of stationary collision pieces 3 which are fixed to the casing of the splitting device 9, so that the above-mentioned effects can be achieved. Such a collision piece can be formed as a radial bar, as shown in FIG. 1, or can be formed, for example, in the shape of a cube or a plate. The high-viscosity stock S3 subjected to the beating treatment reaches the transport screw 7 through the drop hopper 11. The transport screw is installed immediately before the disperser 4. This transport screw 7 drives the stock S3 to the central area of the disperser 4, so that the stock reaches between the dispersing tool sets 5 and 6 and is dispersed. The dispersing tool sets 5, 6 have concentric teeth which mesh axially with each other, and the teeth are rubbed along one another at small intervals. In short, the rotor and the stator are not pressed against each other. Such a dispersing tool set is particularly effective, but requires as uniform a stock flow as possible for even distribution.

[0010] In most cases, the stock is brought to a relatively high temperature for dispersion, and for this purpose a steam supply 12 is provided in this embodiment. The steam supply device 12 supplies high-temperature steam V into the space between the dispersing tool sets. This feed is preferably provided in a ring-shaped heating zone 1.
3, the heating zone is located radially inside the original dispersion zone 14 of the dispersion tool set. In the dispersion zone 14, the intermeshing teeth act to disperse the high consistency pulp stock in a manner known per se. The dispersed pulp stock S4 then flows out of the disperser through the bottom opening.

FIG. 2 shows the structure of the apparatus used to carry out the method according to the invention, viewed from another side, that is, in the direction of the line of sight to the disperser 4. By using a dividing device 9 configured as claimed, not only an optimal distribution of the stock produced by the screw press 8 is obtained, but also the advantage of a saving in space requirements. That is, when the method of the present invention is carried out in industry, the screw press 8 having a relatively large shaft diameter must be selected because the amount is relatively large. The stock produced at the end of the screw shaft has no flowability and must therefore be able to fall substantially freely in the vertical direction. With the dividing device 9 positioned as shown,
It is possible to capture the stock material generated over the entire diameter of the screw press 8 and take out the corresponding material, and then take out the stock material into the drop cylinder 10 located below the stock material. Therefore, it is advantageous to arrange the beating roll 1 at right angles to the main transport direction of the screw press 8. In this case, this unit (in short, the screw shaft and the splitting device 9) can be advantageously arranged with respect to the dispersing machine 4 according to the local circumstances.

FIG. 3 shows the basic structure of the dividing device 9 provided with the beating roll 1. A beating roll 1 having a length L includes a predetermined number of beating rods 2, the outermost end of which is circulated along an imaginary circle having a diameter D. The beating rod cooperates with the plurality of collision pieces 3 fixed to the casing 15 of the dividing device 9. This makes it possible to first grind the incoming bulk stock. This comminution takes place with relatively little force. The reason for this is that the stock produced here is merely compressed and the only problem is to redissolve the conjugate. This cannot be compared to waste paper present in wet paper webs, for example processed in stock solvents. The interval a between the collision pieces 3 which are fixed adjacent to each other in the axial direction is calibrated (determining the width) of the high-viscosity stock S2 passing therethrough.
In effect, it is advantageously chosen to prevent the passage of stock masses which have not yet been divided too much. The passed pieces then have a defined maximum dimension in the direction of extension, for example 30 mm. If necessary, said distance a must be detected by simple experiments. It is also advantageous to make the spacing variable so that the machine can be adapted to different requirements. The axial spacing b between the hitting bar 2 and the impacting piece 3 that is encountered also has a strong influence on the crushing action of this device. This axial distance b is advantageously between 5 and 20 mm.

The form of the beating rod 2 or the collision piece 3 can be selected according to the purpose. In FIG. 3, a quite simple form is shown merely to show the function. Its form can be formed, for example, in the shape of a crescent or scythe,
Alternatively, it is also possible to look obliquely in the circumferential direction. It is also possible to equip a wear-resistant armor layer to extend its service life.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an apparatus for performing the method of the present invention.

FIG. 2 is a schematic side view of a similar device viewed from another direction.

FIG. 3 is a schematic sectional view of the dividing device of the present invention.

[Explanation of symbols]

1 refining roll, 2 refining stick, 3 colliding pieces, 4
Dispersing machine, 5, 6 Dispersing tool set, 7 Conveying screw, 8 Screw press, 9 Splitting device, 10
Drop tube, 11 drop hopper, 12 steam supply device,
13 ring-shaped heating zone, 14 original dispersion area, 15 casing, S1 wet pulp stock,
S2 high consistency paper stock, S3 beaten high consistency paper stock, S4 dispersed pulp stock, W
Moisture, V steam, L Beating roll length, D
The diameter of the virtual circle, a spacing between the impacting pieces, b axial spacing between the hitting rod and the impacting piece encountered

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Volker Niggle Weingarten Finggauerstraße, Germany 14 (72) Inventor Erich Peters, Germany Euskirchen Josef Franke-Strasse 22 (72) Inventor Laurent Rauf Germany Baint Bayenf Lutherstrasse 46 (72) Inventor Josef Schnite Germany Voigt Ruttes Harde 6 F-term (reference) 4L055 AA11 BB02 BB03 CB06 FA11 GA35

Claims (19)

[Claims] 1. A process for preparing a wet pulp stock (S1), comprising: 1.2 preparing a wet pulp stock (S2); Squeezing a part of W); 1.3 Dispersing the pulp stock (S2) of high consistency into a disperser (4)
And 1.4 dispersing the high-viscosity pulp stock comprising a plurality of intermeshing tooth rows and moving relative to each other at intervals. Dispersing with a dispersing machine (4) equipped with a dispersing tool set (5, 6), comprising: 1.5 dispersing a high-viscosity bulk pulp stock (S2); Before feeding to the working area of a rotating beating roll (1) with a plurality of circulating beating rods (2), said beating rods cooperate with a plurality of impacting pieces (3) fixed around the perimeter. A method of dispersing the pulp stock, wherein the high consistency pulp stock (S2) is subjected to a loosening and equalizing treatment. 2. The process as claimed in claim 1, wherein the beating roll (1) is arranged substantially horizontally and the stock reaches the working area of the beating roll (1) from above. 3. The method according to claim 1, wherein the squeezing of the water is carried out by means of a screw press. 4. The conveying direction of the screw press (8) is horizontal, and the center line of the beating roll (1) is positioned perpendicularly and horizontally to the conveying direction.
The described method. 5. The method as claimed in claim 1, wherein the refining rod is moved at a peripheral speed of 1 to 5 m / s. 6. The method according to claim 5, wherein the bar is moved at a peripheral speed of 2 to 4 m / s. 7. The pulp stock of high consistency (S2) is calibrated between impacting pieces (3) located at an interval (a). Method. 8. The method according to claim 7, wherein the calibrated stock mass has a maximum dimension in the extending direction of 5 to 50 mm. 9. A refining roll (1) for producing 1 kWh /
transmitting a specific work lower than t to the pulp stock;
A method according to any one of the preceding claims. 10. The pulp stock is dropped into the conveying screw (7) after passing through the beating roll (1), and the pulp stock is introduced into the center of the disperser (4) by the conveying screw. The method according to any one of the preceding claims. 11. The pulp stock of high consistency (S3) is heated by steam (V) fed between a set of dispersing tools (5, 6). The method described in the section. 12. A high consistency lump pulp stock (S2).
2. A screw press (8) for producing a crusher, a splitter (9) connected to the screw press and a disperser (4) connected to the splitter.
An apparatus for implementing the method for dispersing pulp stock according to any one of the preceding claims, wherein the dividing device (9) comprises at least one rotating beating roll having a predetermined number of beating rods (2) arranged on a peripheral surface. (1) and said dividing device (9) comprises a predetermined number of collision pieces (3) extending substantially inward in the radial direction from the inner wall of the casing (15) of the dividing device; The impingement piece is axially spaced (b) with respect to the adjacent corresponding beating rod (2)
An apparatus for implementing a method for dispersing pulp stock, characterized in that it penetrates radially into the working range of said beating rod. 13. Apparatus according to claim 12, wherein the beating roll (1) is located substantially horizontally. 14. The refining rod (2) has a maximum diameter (D) of 20.
Apparatus according to claim 12 or 13, which is between 0 and 1000 mm. 15. The collision piece (3) is rod-shaped.
15. The apparatus according to any one of claims 1 to 14. 16. The device according to claim 12, wherein the collision piece is plate-shaped. 17. The device as claimed in claim 12, wherein the axial distance between the axially adjacent beating rods (2) is in the range of the order of 10 to 100 mm. 18. A beater (2) and a collision piece (3) which are encountered.
18. The device according to any one of claims 12 to 17, wherein the axial distance (b) between and is between 5 and 50 mm. 19. The length (L) of the beating roll (1) having a tolerance of ± 20% is equal to the outer diameter of the press screw in the screw press (8).
The device according to any one of claims 1 to 18.