SU1513061A1 - Moulding arrangement for paper-making machine - Google Patents

Abstract

The invention relates to the grid part of a paper machine and can be used in the paper industry. The purpose of the invention is to improve product quality and increase paper machine productivity. This is achieved by the fact that the device contains the upper 1 and lower 2 grids, inside the upper grid there are mesh-driving shafts 3, mesh correcting device 4, tensioning device 5, register shaft 6 with a porous surface for draining water, register shaft 7, water-pull box 8, a wedge 9 forming with grids, a water collector 10 for draining water from the register shafts and from the grid supporting device 11, a water collector 12 for collecting water from a separate standing shoe 13 with a curvilinear working surface, covered by a joint area mesh movement, suction box 15 for transferring the formed web to the lower mesh 2, water intake 16. 2 sludge.

Description

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31513061

A rough water drainage surface, register shaft 7, water removal box 8 forming a hydraulic wedge 9 with grids, water collection 10 for removing water from the register shafts and grid supporting device 11, water collection 12 for collecting water

from a free-standing bashmak 13 with a curvilinear working surface, covered by a section of joint motion of the grids, a suction box 15 for transferring the molded web to the lower grid 2, a water intake 16. 2 Il.

The invention relates to the construction of the grid part of a paper machine and can be used in the paper industry.

The purpose of the invention is to improve product quality and increase paper machine productivity.

FIG. 1 - forming device, general view; in fig. 2 is a diagram of building a logarithmic spiral.

The device has an upper 1 and lower 2 grids, inside the upper grid there are grid-mounted shafts 3, set-correct 4 and tension 5 devices, a register shaft 6 with a porous surface for draining water, a register shaft 7, a drift box 8 forming a hydraulic wedge 9 with grids , a water collection 10 for draining water from the register shafts and the grid-supporting device 11, a water collection 12 for taking water from a stand-alone shoe 13 with a curvilinear working surface, covered by the joint motion of the grids, is exhausted Suitable crates 14 and 15 to transfer the molded web to the lower web 2, water inlet 16.

The device works as follows.

The pre-dewatered mass (up to 1.5%) on the lower grid 2 gets into the hydraulic wedge 9. Due to the wedge and tension of the grids with the help of the tensioning device 5, the water is squeezed up and down and collected by the waterer 8 and the suction box 14. The grids converge under the register shaft 6 and squeeze the canvas, and the filtered water due to the centrifugal forces of the register shaft 6 of the device 11, the register shaft 7 is thrown through the upper grid into the water collection container 10, and some of the water through the lower grid into the water intake 16. Then the grids with the clamped web are successively passed over the supporting device 11, the register shaft 7 and the separately standing shoe 13. Due to the fact that in practice the mass characteristic varies with time (grinding, temperature, use of a larger or smaller amount of short fiber , fillers, sizing substances within the regime), there is a change in the water-holding capacity of the mass. Therefore, different amounts of water contained in the mass are suited to the free-standing shoe 13, and to obtain a constant (regulated) amount of water after the two-mesh forming section, the shoe 13 is adapted to adjust the curvature of the working surface. Rotating shoe. 13 during operation and finding the corresponding radii of curvature j, it is possible to reduce or increase the dewatering pressure p, which is inversely proportional to the radius of the crT

visa, i.e. p - where T is the tension force of the nets; p is the radius of the shoe. The amount of water filtered by the mass of the grids depends on the change in pressure p, which determines the conditions for the stable formation of the web. By rotating the shoe 13, the radius of curvature changes, a constant amount of drained water is achieved, which entails an improvement in the quality of the paper web. The regulation of the curvature of the surface of the shoe is determined by the formula of a logarithmic curve of the form

 If

Р Р ч 2f f к ° and ñ1 polar polarity vector; j, is the initial polar radius vector; q is the growth coefficient; - polar angle. The wheel shoe is executed in the form of a rectangular sector, where O is, with a certain growth factor q and finite polyruni radii J.

5151306

Due to the profile of the rotary shoe, determined by the curve, the mode of dewatering the web can be changed, which improves its quality and productivity of the paper machine.

Claims (1)

Shadow Formula A paper machine shaping device containing upper and lower grids, mesh-leading shafts, grid-correcting and tensioning devices, water intake, jumps and a stand-alone shoe with a curvilinear working surface, covered by the joint motion of the grids, on N. Laaarenko’s editor Compiled by J.C. Pin Tehred A. Kravchuk Proof-reader T. Paliy Order 6046/29 Circulation 330 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab., D. 4/3 0 one" characterized by the fact that, in order to improve the quality of products and increase the productivity of the paper machine, the separately standing shoe is made rotatable, and its working surface has a profile defined by the formula of a logarithmic spiral f foq where j) is the final polar radius vector; rd is the initial polar radius vector; q - growth rate; tf is the polar angle {   M % 2 Subscription