SU433692A3 - PAPER MACHINERY P TBL ^ '/ "tn ^ I ^ Tnn' -. ;;; lic ^ j ... ^ '! I'i: S Ts'U - Google Patents

Description

one

This invention relates to a paper machine design and can be used in the pulp and paper industry.

Paper headers are known which contain a mesh part and a device for feeding a slurry.

The purpose of the invention is to improve the quality of the web and reduce water consumption.

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This is achieved by the fact that the suspension supply device is provided with a foam-forming chamber consisting of separate compartments interconnected with blades mounted in them with stirrers, and drainage compartments are installed between the first and second sections during the movement of the suspension. compartment.

Figure 1 shows the proposed machine; figure 2 - foam coating

 longitudinal section of the chamber; 1 in FIG. 3 - the same, top view; on

. 4 is a paddle stirrer foaming chamber; figure 5 is a diagram 5 of the grid part; figure 6 - pressure box; 7 shows a pump for feeding a foamed slurry.

The slurry for the paper machine from roll I through valve 2 enters pool 3 with the mesh 4. The slurry weight supply system contains tank 5 connected by tube $ to pool 5 3. From the slurry tank of a given concentration through a thickener 7, having a tube 8 dl discharge of drainage, enters the foaming device / g. The tank also contains refiner 9 to maintain the desired concentration. The frothing device consists of a series of elements, the main one of which is a foaming chamber 10, made in the form of a number of compartments II, 12 and 13, I in each of which are mounted

 paddle mixers 14 having a rotor 15 and a stator. 16. The rotor attachment to the stator determines the size of the bubbles of the foam. Between otsekalsh

: II and 12 foaming chamber 10

a drainage compartment 17 is installed, connected by an overflow 18 and an opening, tiy 19 with adjacent compartments II and 12. Adjacent to compartment 13 is an exhaust conduit 20 for supplying foamed slurry through device 21 controlling the volumetric gas content to slurry of papermaker machine 22, The mesh also contains the chest shaft 23 and the gauch shaft 24, between which there are groups of suction boxes 25 and 26, as well as the register val 27, Under the dewatering elements, a trough 28 is installed to collect recycled water with erhnostno active agent. Circulating water is pumped into pump 29 by tank 29, the lower nets of the net have showers 31, water from which falls, into collection tank 32 and then into drainage. Sucked out of the suction pens, the water flows respectively into the separator 33 from the boxes 25 and the separator 34 connected to the vacuum pump 35. Water from the separator 33 is pumped into the tank 30 to collect the recycled water from the separator 33, and from the separator 34 water with an agitator 39, the pump 36 has a sinusoidal rotor 40 for supplying the foamed slurry and is equipped with an ejector 41 for sucking the mixture of suction boxes 25 located downstream. The tank 30 is connected by a pump 42 with a foaming chamber 10,

During the operation of the paper machine, the fiber suspension mixed with the surfactant to form a foam with evenly distributed fibers in it from the tank 5 enters the foaming chamber 10. In compartment II of the chamber 10,

the initial foaming of the suspension, which through the overflow 18 enters the drainage compartment 17, nevspenivsh with suspension returns back to compartment II, and the foam through the opening 13 enters the compartments 12 and 13, where it is further frothing, the final foamed suspension through the pipeline 20 is sent to the control device 21. regulating the quality of foam, suspension, and further - to the pressure head of the grid part 22, the dehydration in the grid part is carried out first by suction boxes 26, selected by suspension boxes pump 36 enters the separator 33, and naoos 36 combines both a mechanical effect on the suction mass using a sinusoidal rotor 40, and an ejecting effect using an ejector 41 designed to suck the latter along the drawers. From the suction boxes 26, the mixture enters the separator 34. Both separators are connected to a vacuum pump 35, Water from the separator 33 and from a trough 28 by pumps 35 and 23 is fed to a tank 30 of recycled water,

 Through the use of foamed slurry, water consumption is reduced during web formation and the structure of the latter is improved.

A paper machine containing a net part and a suspension supply device, characterized in that, in order to improve the quality of the web and reduce water consumption, the suspension supply device is equipped with a foam-forming chamber, consisting of separate interconnected compartments with bladed blades. agitators, and a drainage compartment is installed between the first and second sections along the suspension movement.

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