ES2225318T3 - PROCEDURE FOR THE DISPERSION OF A PAPER FIBER MATERIAL AS WELL AS INSTALLATION TO PERFORM THE PROCEDURE. - Google Patents

Abstract

The disperse a paper fiber material is prepared with water, and compressed into a high consistency material (S2) with coarse fragments, to be fed into the working zone of a rotating roller (1) fitted with sticks (2) before dispersion. They act with static peripheral beating units (3), to loosen and homogenize the high consistency paper fiber material. An Independent claim is also included for a paper fiber dispersion assembly with a distribution stage (9) having at least one rotating roller fitted with sticks. It has a number of peripheral beating units projecting inwards from the housing wall, to give an axial gap between them and the rotating sticks of 5-50 mm.

Description

Procedure for dispersion of a material of paper fibers, as well as installation to perform the process.

The invention relates to a method for the dispersion of paper fiber material according to the preamble of claim 1

The procedures of the indicated type previously used, for example, to improve the quality of fiber material obtained from used paper. It is known that the Paper fiber material can be homogenized by dispersion and This can be fundamentally improved. To do this, a high consistency fiber material that has a content in dry matter between 15 and 35%. In many cases it is dispersed with a temperature that is widely above the temperature ambient. The gaskets of the disperser with which they are made procedures of this type are compact and have a magnificent dispersing action However, they assume a homogeneous flow of material. Since the time of stay between them of the matter It is only very short, irregularities cannot be compensated. The consequence would be a non-homogeneous dispersion.

In the case of the thickening process performed a considerable part of the water present is dried under pressure previously in the fiber material, so, first of all, fundamentally increases its viscosity in the dispersion and, in second, if necessary, it has to be heated together less water. An especially economic machine for thickening It is the extrusion press. In the case of an extrusion press, the suspension of fiber material is dried by pressing between a transport screw and a perforated envelope that surrounds, so that water flows through the gaps of the envelope. The pressed body or plug that forms with it is Eject out of the worm and split into partial pieces. Partial pieces are relatively large and therefore lead to irregular flow through the devices subsequent.

From document DE 197 12 653 A1 it is known a dispersion device in which the feed is fed directly stopper that originates from an extrusion press. In addition, it is crushed in a fragmentation tool with scrapers or blades that They are located in the feed duct of the disperser.

The task of the invention is to create a device with which the high plug can be fed to the dispersion consistency that comes from the extrusion press, so that it guarantee a particularly uniform dispersion with high operating safety

This task is completely solved by characteristics cited in the characterizing part of the claim 1.

With the help of the new procedure it is possible make a high consistency material that can be processed correctly in a disperser. The hammer cylinder used according to the invention it takes the compressed plug pieces when pressed water and split them, especially because the hammers swivels act in conjunction with the impact pieces that are fixed on the perimeter. Larger fragments stay longer in the treatment area until they can pass, so that the material flow to the disperser becomes very homogeneous. Then additionally crush and swirl radially in the area internal of the disperser fittings, with which they originate agglomerations of very fine fibers. If so desired, the Steam feeding is done in a water heating zone below the fittings to heat the material to the temperature necessary. In addition, as a result of the crushing taken to out is enough with a relatively warm up time short. The true dispersion, that is, the modification of material properties, takes place in the dispersion zone of the trimmings, which is adjacent downstream.

The invention and its advantages are explained by drawings. In this regard, they show:

Figure 1, schematically, the installation to perform the process according to the invention;

Figure 2, another view of an installation Similary;

Figure 3, schematically, the device of distribution according to the invention.

Figure 1 shows details of an installation which is especially suitable for performing the procedure according to the invention. In the upper part of the image you can see the press 8 extrusion in which, from the aqueous fiber material S1 of paper, a large part of the W water is dried under pressure. generates a highly consistent compact fiber S2 material that it breaks into large pieces at the end of the extrusion press and falls down in a small pit 10 of fall in the device 9 of distribution below. This includes as a component fundamental a hammer cylinder 1 with hammers 2 fixed on it and moved in a rotating way. Hammer cylinder 1 works together with impact parts 3 that are fixed, applied on the periphery, that is, on the housing of the device 9 of distribution, so that the action already described can occur. These types of impact pieces can be, as shown here, in the form of rods, with radial alignment or, for example, also cubic or in the form of discs. Through a drop hopper 11, the highly consistent fiber S3 material treated in this way reaches a screw 7 endless transport that is installed directly before the disperser 4. This worm 7 drives the fiber material S3 to the central zone of the disperser 4, of way that arrives between the fittings 5 and 6 of the disperser and it scattered The trimmings have concentric serrated rows which are axially assembled with each other, which move between Yes with a small separation. Therefore, the rotor and the stator do not they press against each other. This type of trimmings dispersers are especially effective, however, they require a material flow as uniform as possible for dispersion homogeneous

In many cases the material for the high temperature dispersion, for which it is present here a 12 steam feed. With the help of this food 12 of steam feeds steam D of hot water in the space between the two disperser fittings. Conveniently this has place in a hot ring-shaped zone 13 that is radially within the true zone 14 of the disperser of the fittings. In rows 14 of the disperser the rows act teeth that are assembled into each other, so that the material of high consistency paper fibers disperses so known in itself. Then, the S4 paper fiber material dispersed leaves the disperser through an opening of the background.

Figure 2 illustrates the arrangement of the devices used to perform the procedure in another view, and, specifically, in the direction of observation of the disperser 4. Using a distribution device 4 constructed according to the claims are achieved not only an optimal distribution of material presented in the extrusion press 8 but also the advantage of a provision that saves space. At case of industrial performance of the procedure must select an extrusion press 8 with a shaft diameter relatively large due specifically to the quantities relatively large The fiber material presented to the End of the endless shaft is not fluid and therefore should be able to fall down vertically fundamentally free. The position of the distribution device 9 as indicated allows to capture the fiber material that is presented throughout the diameter of extrusion press 8 and, after treatment corresponding, divert it to the well 10 that is available below. Therefore, it is appropriate to arrange the hammer cylinder 1 at right angles to the main transport direction of The extrusion press 8. This unit, that is, the screw shaft endless and the distribution device 9, can be arranged then conveniently in relation to the disperser 4, in function of spatial conditions.

Figure 3 shows the basic structure of the distribution device 9 with hammer cylinder 1. He hammer cylinder 1 with length L includes a number of 2 hammers whose outermost ends rotate in a circle with the diameter D. These act together with the impact pieces 3 fixed in the casing 15 of this device. This is achieved that the thick-cut paper fiber material presented It is crushed first. Crushing already takes place with an action of relatively reduced force, which should lead to only this compressed the paper fiber material presented here and to that only leads to dissolve this compound again. This can not compare, for example, with the used paper present in bands wet, as it is treated, for example, in a fraying machine. From convenient way, the separations between the impact pieces 3 axially contiguous fixed are selected such that the S2 material of high consistency fibers is calibrated in medium, of so that the passage of pieces of material is therefore avoided crushed yet too little. The particles that have passed to through then have a maximum measure defined in one direction of stretching of, for example, 30 mm. Eventually, the separation a must be determined by a simple test. It could also be advantageous to make it variable, so that the machine can be adjusted to different requirements. Also the axial separation b between hammers 2 and the impact pieces 3 found have a intense influence on the crushing action of this device. This is advantageously between 5 and 20 mm.

The shape of hammers 2 or pieces 3 of impact has to be selected conveniently. Here are shown Very simple ways to show only the operation. They can also be, for example, sickle-shaped or placed inclined shape seen in the perimeter direction. also can conceive to provide them with armor without wear to prolong their life Useful.

Claims (19)

1. Procedure for material dispersion of paper fibers with the following stages:

1.1.

disposition of a material (S1) aqueous paper fibers;

1.2.

pressure drying of a part of the water (W) to form a material (S2) of paper fibers with pieces thick of high consistency;

1.3.

transport the fiber material of high consistency paper to a disperser (4);

1.4.

dispersion with a disperser (2) that It has at least two trimmings (5, 6) of the disperser, the which contain in each case several serrated rows that meshed within each other and that move relative to each other with a separation, thereby dispersing the fiber material of highly consistent paper,

characterized because

1.5.

he material (S2) of coarse-cut fibers with high consistency provides before dispersion in the area of action of a rotating hammer cylinder (1), which is equipped with rotary hammers (2) acting together with parts (3) of peripheral impacts that are fixed, so that a loosening and compensation of fiber material (S2) highly consistent

2. Method according to claim 1, characterized in that the hammer cylinder (1) is arranged essentially horizontally and that the material arrives from above to the area of action of the hammer cylinder (1). 3. Method according to claim 1 or 2, characterized in that the pressure drying of the water is carried out with the help of an extrusion press (8). Method according to claim 3, characterized in that the direction of transport of the extrusion press (8) is horizontal and that the central line of the hammer cylinder (1) is arranged at a right angle to it and horizontally. Method according to one of the preceding claims, characterized in that the hammers (2) move with an angular speed between 1 and 5 m / s. Method according to claim 5, characterized in that the hammers (2) move with an angular speed between 2 and 4 m / s. Method according to one of the preceding claims, characterized in that the material (S2) of high consistency fibers is calibrated between impact pieces (3) that are arranged with a gap (a). Method according to claim 7, characterized in that the maximum size of the pieces of calibrated fiber material is adjusted in a stretching direction to a value between 5 and 50 mm. Method according to one of the preceding claims, characterized in that a specific job of less than 1 kWh / t is transmitted to the fiber material with the hammer cylinder (1). Method according to one of the preceding claims, characterized in that the fiber material, after passing through the hammer cylinder (1), falls into a screw (7) with no end of transport that centrally introduces it into the disperser (4). Method according to one of the preceding claims, characterized in that the material (S3) of high consistency fibers is heated by steam (D) of water fed between the gaskets (5, 6) of the disperser. 12. Installation for carrying out the method according to one of the preceding claims with an extrusion press (8) for generating the material (S2) of high-strength thick paper fibers, as well as a disperser (4) that is connected, characterized in that between the extrusion press (8) and the disperser (4) there is a distribution device (9) containing at least one rotating hammer cylinder (1) in which a number of hammers (2) and because the distribution device (9) has a number of impact parts (3), which extend from the inner wall of its housing (15) fundamentally radially inwards, so that they project radially in its area of action to an axial distance (a) from the corresponding adjacent hammers (2). 13. Installation according to claim 12, characterized in that the hammer cylinder (1) is arranged essentially horizontally. 14. Installation according to claim 12 or 13, characterized in that the outermost diameter (D) of the hammers (2) is between 200 and 1000 mm in size. 15. Installation according to claim 12, 13 or 14, characterized in that the impact pieces (3) are rod-shaped. 16. Installation according to claim 12, 13 or 14, characterized in that the impact pieces (3) have a disk shape. 17. Installation according to claim 12, 13, 14, 15 or 16, characterized in that the axial separation (a) between axially adjacent hammers (2) is in the size range between 10 and 100 mm. 18. Installation according to claim 12, 13, 14, 15, 16 or 17, characterized in that the axial separation (b) between the hammers (2) and the impact parts (3) found is in the size range between 5 and 50 mm. 19. Installation according to claim 12, 13, 14, 15, 16, 17 or 18, characterized in that the length (L) of the hammer cylinder (1) corresponds to the outer diameter of the endless screw of the extrusion press (8) with a tolerance of ± 20%.