SU1002443A1 - Blade of wire section of paper-making machine - Google Patents

Description

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

Devices are known that improve the uniform distribution of fibers in the sheet structure by exposing steam jets to a sheet of paper at some distance from the outlet slot of the headbox, as well as using a hydraulic jump, resulting in horizontal flows that disorient paper fibers. one .

Also known are devices in which, to more evenly distribute the fibers, to better interweave them, to increase the strength of paper in the transverse direction, the papermaking mesh is stretched in a horizontal plane perpendicular to its direction in the area between the chest shaft and the suction boxes. Although the use of tricks helps to improve the quality of paper, however, its effectiveness is sharply reduced with increasing paper machine speed above 250-350 m / min. Application

The mechanisms of the machines significantly complicate the design of the grid tables, leading to a decrease in the reliability of their work5.

The closest in technical essence is the scraper of the grid part of the paper machine, comprising a body with supporting surfaces for

10, each one separated from one another by the drainage channel, and means for fixing the body on a non-dense guide. The uniform distribution of the fibers is achieved by sucking water through the mesh and moving it along a channel located between the supporting surfaces lying in the same plane. In this way, microturulent pulsations of filtered water, dispersing fibers on the grid 31 are generated.

Claims (3)

This technical solution has disadvantages. The use of the channel with its geometrical parameters unchanged during the molding process 25 does not actively control the dispersion of fibers on the grid depending on the speed of the mesh, the concentration of fibers, the nature of decontamination, the installation site, and also does not allow you to quickly change from Starting one type of product to another. The aim of the invention is to ensure the distribution of fibers in the structure of the web being formed on the mesh and expanding the range of its technological capabilities. The goal is to achieve that the scraper of the setbone part of the paper machine, containing the casing with supporting surfaces for the grid separated from one another along the course of its movement by the drainage channel, and the means for mounting the casing on the carrier guide, has a flexible plate installed in the upper the drainage channel is flush with the supporting surfaces of the housing, and the chamber formed by the walls of the channel and the elastic plate is provided with a nozzle for connection with a vacuum line. Fig, 1 shows the scraper, cross section; in fig. 2 - the surface of the channel under the influence of vacuum. The paper machine's scraper includes a housing 1 which has a drainage channel between the odor surfaces 2, 3, and also a T-shaped slot 4 mounted on the guide rail 5. The channel has a plate b from elastic material, for example, rubber, installed in its upper part flush with the supporting surfaces 2 and 3. Thus, the upper part 7 of the drainage channel canal directly serves to drain water, and its lower part in the form of a chamber 8 formed by the channel walls and elastic b plate provided with a connection (not shown) connected to a vacuum line. The paper machine's scraper works in a spurious manner. When paper / zssy enters the papermaking grid, a vacuum is created in chamber 8 to make the plate b concave. Water is sucked through the screen and moves to the top of the channel. The image with this turbulence generates microturbulent oscillations. which uniformly disperse the fibers located on the grid, thereby achieving a uniform mass distribution of 1 m, improving the structure of the paper web and its lumen. Each paper pulp with its working concentration, composition and degree requires a certain range of microturbulence in the dewatering zone and the formation of paper pulp, which ensures its most efficient dispersion. Therefore, the intensity and scale of the generated microturbulence is determined by the geometrical parameters of the upper part 7 of the channel, which are provided by vacuum control. The use of the invention (instead of traction mechanisms) significantly improves the quality of products due to the uniform distribution of the mass of 1 m of paper web. Claims of the Shabber net part of papermaking maagan, comprising a housing with supporting surfaces for a mesh separated from one another along its movement by a drainage channel, and means for attaching the housing to a carrier rail, characterized in that in order to ensure uniform distribution of the fibers in the structure of the web to be formed on the grid, expanding the range of its technological capabilities, it has an elastic plate installed in the upper part of the drainage channel and is flush with the supporting surfaces the rest of the body, and the chamber formed by the walls of the channel and the elastic plate is equipped with a pipe for connection to the vacuum line. Sources of information taken into account during the examination 1. I. Kugushev. Theory of the process of reflux and dehydration of paper pulp. 1967, p. 95 2. Eidlin I.Ya. Paper and finishing machines, 1970, p. 90. 3.Patent of Great Britain No. 1447486, cl. D 2 A, 1971 (prototype).