SU1300057A1 - Wire section of paper-making machine - Google Patents

Abstract

The invention relates to the construction of the grid part of a papermaking machine and will find application in the pulp and paper industry. The purpose of the invention is to enhance the dispersion effect on the pulp to be dried. The grid part contains the headbox 1, the bottom 2 and the top 3 grids, which form the dewatering zone 4 of the pulp in the area 5 of their joint movement. In zone 4, the upper and lower dewatering elements are installed, having a curved surface on the side of grids 2 and 3. Dehydrating elements have on the working surface interleaved grooves and openings for diverting filtered water on the working surface. During the formation of the web between dehydrating dim elements, intense turbulent water movement occurs due to the interaction of centrifugal forces and tension forces of the grids 2 and 3. This contributes to a better redistribution of the fiber in the web structure and increase its quality. 3 З.П. f-ly. 4 il. i (L o o o o fie;

Description

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

The purpose of the invention is to enhance the dispersing effect on the dehydrated pulp.

FIG. 1 shows the net part of the general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. 2; figure 4 - section bb In figure 2.

 The grid part contains the headbox 1, the bottom 2 and the top 3 infinite grids, which form the dewatering zone 4 of the pulp, in which the curvilinear section 5 of the joint motion is located. On either side of it are installed one above the other dewatering elements 6 and 7.

In contact with the grids of the surfaces of elements 6 and 7, grooves 8 and openings 9 and 10 are made to remove filtered water.

The lower 6 and upper 7 dewatering elements can be connected to a reciprocating drive, such as vibrators 11-. In the dewatering elements are grooves 12, in which the projections 13 are located.

The grooves 8 on the surfaces are dehydrated by the cich elements 6, which are in contact with the nets 2 and 3, are made so that the grooves 8 on one surface are opposite the bridges 14 between the grooves 8 of the other surface and serve to turbulize the filtered WATER.

In addition, the forming grooves 8 are located at an angle c, to the direction of movement of the grid 2 and 3, while the grooves 8 on the lower 6 and upper 7 parts of the element 5 are made in different directions.

The optimal dimensions of the grooves 8, their angle of inclination to the axis of the grid, the amplitude and frequency of oscillations of parts 6 and 7 of element 5 are determined by the type of product produced, the mode of operation of the papermaking machine, and its design parameters.

The grid part works as follows.

Paper mass from the pressure box 1 is fed to a flat portion of the grid 2. In the area of curvilinear

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Section 5, the paper web comes into contact with the upper mesh 3, which forms with the mesh 2 a web forming zone. During the passage of the web in the molding zone, the formation of its rf dewatering structure takes place simultaneously through the lower and upper grids. In this case, one part of the water, filtered through the upper grid 3 due to centrifugal forces and the tension of the grids 2 and 3, falls into the openings 9 of the upper element 7 and is removed into the collection, the other part of the water falls into the grooves 8 of the upper element 7, where intense turbulent flows that change the direction of their movement due to the arrangement of the grooves 8 at an angle ot to the direction of movement of the grids 2 and 3. As a result, a transverse composition of the velocity of these streams appears, the value of which is determined by the size of the grooves 8, speed Stu machines, paper massy- views.

At the same time, one part of the water, filtered through the lower grid 2, is removed into the collector through the holes 9 by means of a vacuum, the other part of the water enters the grooves 8 of the lower element 6, where intense turbulent flows are also formed, changing the direction of their movement due to the location of the channels 8 at an angle Ы to the direction of movement of the grids 2 and 3i

Thus, in the grooves 8 of the lower 6 and upper 7 elements, a multitude of intensive turbulent flows are created, containing turbulent eddies. Turbulent streams throw portions of water filtered through grids 2 and 3, simultaneously through the lower 2 and upper 3 grids into the formed web, thereby destroying the layer of settled fibers, dispersion and disorienting the pulp of paper pulp located between grids 2 and 3. uniform distribution of fibers in the structure of the formed web, level the properties of the lower and upper side of the paper, i.e. the phenomenon of versatility is eliminated, the dehydration process is intensified.

When vibrodrive 11 is turned on, turbulent energy increases.

vortexes, thereby enhancing the dispersing effect on the molded web, increased disorientation of the fibers, which leads to a more uniform distribution of fibers in the structure of the molded web, and an increase in the quality of the paper web. The use of the invention allows to significantly improve the quality of the cast sheet due to the uniform distribution of fibers in the structure of the paper web, which is achieved by dispersing and disorienting the flow of paper pulp located in the forming zone between the two grids through the upper and lower sections simultaneously.

Claims (4)

1. The grid part of the papermaking machine, containing the pressure box, two endless nets, forming in the dewatering zone of the pulp a section of joint movement, on both sides of which are installed dewatering elements whose curvilinear working surfaces for 000574 The filtered water faces the grids, making it possible that, in order to enhance the dispersing effect on the dewatering pulp, the dewatering elements are installed one above the other, and their curvilinear working surfaces are made conjugate and have angular to the direction of movement the grids the fillets alternating by jumpers for a turbulization of filtered water -. 2. The grid part according to claim 1, dt is characterized in that the dewatering elements have a drive for reciprocating movement across the direction of movement of the grids. 3. The grid part of item t, .o t is distinctive in that the grooves of the upper dewatering element are located opposite the bridges of the lower dewatering element. 4. The grid part according to claim 1,. This means that the grooves of the dewatering elements are made multidirectional with respect to the direction of movement of the nets. 15 V 20 25 /one- ± Iff FIG. 2 .1300057 6-6 .З fa24 oh oh Editor E. Kopcha Compiled by Y. Clin Tehred L.Syordyukov Proofreader L, Patay Order 1122/27 Circulation 341Subscribe VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Raushsk nab, d. 4/5 Production and printing company, Uzhgorod, st. Project, 4