FI77904C - Device for destruction of paper, cardboard and pulp. - Google Patents

Description

77904

APPARATUS FOR ACCOMMODATION OF PAPER, PAPERBOARD AND PULP -ANORDNING FÖR DESTRUCTION AV PAPPER, PAPERBOARD

The present invention relates to an apparatus for disintegrating paper, board and pulp, comprising an open-top bath into which the raw material to be disintegrated is fed, for example from an overhead paper machine, and discharged by a pump, and one or more diffuser units mounted on the bath wall, preferably rotating rotor.

A device like this (pulper) is used primarily under large paper machines to break up paper and board. Above the device, chute-like guide members are formed which guide the paper and paperboard from the paper machine to be disintegrated from their upper end into an open bath. Diffuser units are placed on one wall of the bath, by which the rotors act. Most often there are two rotors and each has its own drive motor. The rotors are usually placed side by side at the same height from the bottom of the tub and their axes are usually parallel. Outside the bath, a scattered mass discharge pump is usually placed between the rotor shafts.

The main disadvantage of current devices is that the effect of recirculating the mass of the rotors is poor, so that the paper or board to be decomposed does not reach the area of influence of the rotors effectively. At the same time, adhesives and various fillers have evolved and production volumes and requirements for machines have increased.

The object of the present invention is to improve the recycling of the pulp so that the access of the pulp to the area of influence of the rotors is enhanced. The object is achieved by a device according to the invention, characterized in that the bath is provided with one or more mass-feeding members, the axis of which 77774 communicates with and is parallel to the axis of the rotor, and that the distance of the mass-feeding member from the rotor-side rear surface is less than or equal to than 4000 mm.

A preferred embodiment of the invention is characterized in that the mass feeding member is a propeller.

Another preferred embodiment of the invention is characterized in that the mass feeding member is a screw.

The most important advantages of the invention are energy savings based on the fact that the diffuser rotors start only in the event of a break and that the rotor receives an axial filling corresponding to the radial output of the diffuser rotor, whereby the paper entering the device flows efficiently to the diffuser rotor.

In the following, the invention will be explained in detail with reference to the accompanying drawings, in which

Fig. 1 shows a side view and a partial section of a known device for breaking up paper, board and pulp.

Fig. 2 shows a known device from above and in a simplified form.

Fig. 3 shows a top view and a simplified view of a device according to an embodiment of the invention.

77904

Fig. 4 shows a top view and a simplified view of a device according to another embodiment of the invention.

Figure 1 shows an apparatus for breaking up paper, board and pulp. The device is most preferably located below a large paper machine, whereby the substance to be disintegrated is fed to the bath 1 via the open top of the bath. For this purpose, oblique guides 2 are formed above the tub, which are shown only in Figure 1. The dispersing of the paper, board and pulp in the tub 1 takes place by diffuser units 3, which are most preferably rotary rotors. In the embodiment examples presented in this application, there are two rotors and they are located at the same height and on the same wall 6 of the tub. The drive motors 4 of the rotors 3 are located outside the tub.

Figure 2 also shows a known diffuser device and shows the mutual position of the rotors. In known devices, the circulation of the mass inside the bath 1 is not efficient enough.

Figure 3 shows, in a considerably simplified manner, an apparatus for breaking up paper, board and pulp according to an embodiment of the invention. In it, the axes of the diffuser rotors 3 coincide with and are parallel to the axis 8 of the member feeding the mass to the rotors, here the propeller 7. The propeller 7 can rotate either at the same or different speed than the rotor 3. The distance of the propeller 7 from the rear side of the diffuser rotor 3 on the motor side is less than or equal to 4000 mm. The arrows drawn in Fig. 3 show the flow directions of the pulp and show that the supply of pulp to the rotors 3 is more efficient than before. In Fig. 4, the mass feeding member is a screw 9 or the like, which is otherwise mounted in the same manner as the propeller 7 described above.

4 77904

It will be clear to a person skilled in the art that the invention is not limited to the exemplary embodiments presented above, but can be varied within the scope of the appended claims.

Claims (5)

5 77904 A device for breaking up paper, board and pulp, comprising a top-open tub (1) into which the raw material to be spread is fed, for example from an overhead paper machine and from which it is dismantled by a pump, and one or more baths (1) on the wall ( 6) a distributed diffuser unit (3), most preferably a rotating rotor, characterized in that one or more mass feeding members (7, 9) are arranged in the bath (1), the shaft (8) of which communicates with the shaft (5) of the rotor (3), and is parallel to it, and that the distance of the mass feeding member (7, 9) from the rear surface of the rotor (3) on the motor side (4) is less than or equal to 4000 mm. Device according to claim 1, characterized in that the mass feeding member is a propeller (7). Device according to claim 1, characterized in that the mass feeding member is a screw (9). Device according to one of Claims 1 to 3, characterized in that the rotational speeds of the pulp supply element (7, 9) and the rotor (3) are equal. Device according to one of Claims 1 to 3, characterized in that the rotational speeds of the pulp supply element (7, 9) and the rotor (3) are different. ♦