SU1063901A1 - Head box for feeding high-concentration paper-pulp onto wires of paper-making machine - Google Patents

Abstract

PRESSURE BOX FOR FILLING ON THE NET OF PAPER MACHINE PAPER MASSES OF HIGH CONCENTRATION, containing a chamber with an inlet and flow distributor, a deflocculating device and a mass-transfer slotted channel, which is so much needed to improve the quality of the application, as if it is using a cell, it has to move a material, it has to get a surface with a flexible mold, it is necessary to get the quality of the application, it is enough to get a material with a flow mold, it is enough to get the material with a flow pattern, it is necessary to improve the quality of the material with a flow pattern, it is possible to improve the quality of the material, with a flow pattern, it will be enough to get the material with a flow pattern, it will have a material with a flow pattern and it will have a material with a flow pattern and it will have a drop layer and it will be able to improve the quality of the application with a 22-gauge, and it will have a flow wall with a flow layer, which will be able to change the quality of the application with a 22 u. exceeding 2-10 times the height of the gap of the mass-supply channel installed in the chamber before entering this channel along its axis, and the damping plate installed in the upper part of the chamber on cylindrical roller. / 5 d,

Description

The invention relates to equipment for paper machines and is intended for use in the pulp and paper industry when casting a paper web from a slurry of a concentration of 2-5%.

With such a high concentration of fibers in suspension no longer have sufficient mobility. To obtain quality products in the suspension supplied to the net, the fibers must be evenly distributed throughout its volume, i.e. to form an already formed web, which should only be dehydrated.

A pressurized box is known for supplying a slurry to a grid of a paper machine, in which a vibrating defloculator is used, consisting of perforated plates vibrating in the transverse direction with respect to flow ij.

The disadvantage of this box is a sharp decrease in the pulsation intensity of the dispersed medium as it moves away from the plates. In addition, the presence of perforations on the vibrating plates leads to the emergence of large-scale turbulence and, consequently, to an increase in flocculation.

Closest to the present invention, there is a pressure box for flooding a highly concentrated paper pulp on a papermaking machine, comprising a chamber with an inlet port and a flow distributor, a deflocculating device and a mass slit channel. The oscillations created by the deflocculating device promote the advancement of the suspension 2.

However, oscillations of the plates of the deflocculating device cause an uneven in time yield of the suspension to the net, an increase and decrease in the mass of the outgoing suspension corresponds to the frequency of oscillations of the deflocculating device.

The purpose of the invention is to improve the quality of the cast sheet.

The goal is achieved by the fact that the headbox has a dispersing cylindrical roller with a diameter greater than 2-10 times the height of the slot of the mass-carrying channel installed in the chamber before entering the channel along its axis, and a damping plate installed in the upper part of the chamber above the cylindrical roller .

The drawing shows the pressure box of the paper machine, the cross-section.

The pressure box contains a chamber 1 with an inlet nozzle 2 and a flow distributor 3 installed in the mixing section 4, a vibration-deflocculating device located inside the chamber 1, and an inlet channel 5 for supplying slurry to the tipped paper zone.

Chamber 1 consists of a series of sections 6. A rational number of them is up to three to five.

Vibration-deflocculating device made in the form of rods 7, connected to the vibration actuator 8. On the rods 7 are fixed moving plates 9.

5 fixed plates 10 are attached to the walls of chamber 1. Movable

9 and fixed 10 plates form a multichannel mass conduit. The vibration impact to the rods 7 and the movable plates 9 fixed on them is transmitted through the vibrodrive 8, consisting of an electric motor, an eccentric mechanism and a transmission linkage device. Between bed 11 and flange 12

5 gear-lever device vibrodrive 8 installed powerful shock-absorbing springs 13, contributing to the stable operation of the vibrating drive 8 in a wide range of speeds.

In the chamber 1 along the axis of the inlet channel 5 there is a cylindrical roller 14. The diameter of the roller 14 is 210 times the height of the channel 5. In the upper part of the chamber 1, at the entrance to

5 inlet channel 5 installed

the elastic plate 15 is perpendicular to the oscillation direction of the plates 9. It is attached to the body of the chamber 1 through elastic gaskets 16 s

It is possible to provide oscillatory movements in the direction of oscillation of the plates.

Headbox works as follows

5 way.

Fibrous suspension through the inlet 2 and the flow distributor 3 is fed to the mixing section 4 of the chamber 1. Then the suspension

0 moves in sections b between the movable 9 and the fixed 10 plates and in the channels between the edges of the said plates, the inner walls of the chamber 1 and the rods

e 7 to the inlet channel 5. Under the action of the pulsating movement of the suspension, the elastic plate 15 of the chamber 1 comes into oscillatory motion and dampens the oscillation energy of the suspension. During its movement to the inlet channel 5, the suspension flows around the cylindrical roller 14 (the movement of the suspension is indicated by arrows).

The work of the pre-pressured headbox is based on the uniform deflowering and averaging effect of 3 10 on the floccules of the pulsating oscillations of the liquid component of the suspension, when under the influence of hydrodynamic flow forces of the pulsating liquid medium (water) the floccules break down and disperse in the space with the formation of a uniform mesh structures. Most of the volume of the suspension. : entering the pressure box, is subjected to multiple treatment in the active deflocculation zone. At the exit of the suspension into the inlet channel, the oscillating energy of the pulsating 014 movement of the suspension is quenched due to the damping action of the ELASTIC plate 15. When the roller flows around the roller 14, two flowing streams are superimposed and the oscillating pulses of the moving mass of the substance (interference) are extinguished. The proposed pressure box ensures a uniform pulsation of the dispersion medium, the elimination of large-scale turbulence, which guarantees the high quality of the cast sheet.

Claims (1)

HEADER BOX HIGH CONCENTRATION PAPER MACHINE GRID WITH A CONCENTRATION PAPER MACHINE containing a chamber with an inlet pipe and a flow distributor, a deflocculating device and a mass-feed slit channel, characterized in that, in order to improve the quality of the cast web, it has a dispersing cylindrical roller with a diameter exceeding 2-10 times that slots of the mass inlet channel installed in the chamber before entering this channel along its axis, and a damping plate mounted in the upper part of the chamber above the cylindrical roller.