CS216852B1 - Device for making the groundwood pulp - Google Patents

Abstract

The device for the production of wood pulp according to the invention solves the problem of maintaining maximum production on the grinder by eliminating deficiencies in the quality and fineness of the wood pulp during its further processing. The essence of the invention lies in the fact that the mixing tank is connected via a pump and an inlet pipe to the refiner and is equipped with a level regulator, while the inlet pipe of the substance is equipped with a substance consistency regulator and a pressure sensor and the refiner is connected via a control element to the power regulator, while the control element is connected to a speed regulator and a pressure sensor and the outlet pipe from the refiner is equipped with a flow sensor and this is connected to the control element. An example of connecting the device to the production line according to the invention is shown in Fig. in the attached drawing

Description

216 832 (54) Wood production plant 1

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing uniform quality wood. for the same quantity. All previously used abrasive control systems have mainly been directed to producing pulp of the same quality directly on the grinding machine. Such regulation, controlled electrically, is described in OS 1 511170, by the hydraulic path OS 1 198 190, by the mechanical path pat. Swiss Patent 390 041, U.S. Pat. No. 3,255,070, Swedish Patent 203,969 and English Patent, 985,196 also deal with the control of wood quality in the abrasive process.

The disadvantage of these systems is that if quality control is introduced directly on the abrasive of the measured quantities, the grinding will produce varying quantities of wood of the same quality with varying stone sharpness. After sharpening the drum with the pulley, the power of the drive electronically decreases sharply. If used, the power control for constant power, expressed by the camera. It is therefore absolutely necessary to fulfill this condition to reduce the feed rate in the grinding shaft. However, this will mean a reduction in the amount of wood produced. Wood pulp morphologically represents a very inhomogeneous mixture of fibers of various lengths, diameters, whiteness, inability, and also contains chips, wood chips and impurities of organic (korea, bast) and inorganic (sand). In addition, it also contains fiber bundles, fiber fragments, fibrilized fibers, and mucilage fibers.

For each mode of grinding, the individual beads in the product wood will be different. For example, in the case of coarse grinding, the proportion of chips, long fibers and fiber bundles will be increased. During the further processing of the wood vine, it is necessary to separate the unwanted particles from the particles usable for papermaking. A sorting device is used for this purpose. Ideally, the sorting device would have little to have a highly selective separation effect on unwanted particles, and all the particles that can be used can be used.

However, sewing screens used today have limited selectivity. Large debris and chips are well retained, but also retain a large portion of good long and finer fibers.

The sorting sieve device divides the wood pulp into two parts: a part of the folding of usable fine particles and small point impurities, and a part that will contain chips, fiber bundles, coarse threads, long fibers, and a small portion of fine parts.

The dividing ratio in which the separator divides the main stream of the substance will depend on the following 2 factors: sorting structure, sorting of sorted wood, pressure drop of the sorting agent, total flow rate and character of the sorted substance.

Taking into account that for common circuit piping in the grinding plant, the pumped amount of water is constant, the pressure drop is constant, the separator is installed and the abraded amount of wood is equal, then the dividing ratio of the main flow given by the nature of the substance. When grinding, more substance goes into the filler and further processing on the refiner than in fine grinding.

The refiner has the task of pulping the fiber and fine chips into a usable substance that will not be retained by the screen separator in the next cycle. In the case of sanding the constant performance, the nature of the substance will be predominantly due to the stone sharpening cycles, as well as the varying amount of refinery flowing agent. It is therefore desirable that the efficiency of the refiner in shredding chips and coarse grains is controlled by the refiner to maintain consistent wood quality.

The drawbacks of the wood production systems used up to now are eliminated by the wood production plant according to the invention, which consists in that the stirred tank is connected via a pump and an inlet pipe with a refiner and is provided with a head regulator, the fabric inlet pipe being provided with a fabric consistency regulator and a sensor pressure and the refiner is connected to the power regulator via a control pin, wherein the control member is connected to a speed sensor speed regulator and the discharge tube is provided with a flow sensor and is connected to the control member.

The wood production plant according to the invention solves the problem of maintaining maximum production on the sand by eliminating the shortcomings in the quality and fineness of the wood during its further processing. In particular, it is advantageous in that it is not sensitive to fluctuations in the quality of the pulp in the main stream due to various changes in the conditions affecting the grinding process. In the production of wood by a plurality of grinders, it is possible to achieve a uniformity of the wood character by a suitable time arrangement of the cycling of the grinding stones.

The attached drawing gives an example of the connection of the device to the wood production line according to the invention. The main stream of wood produced on the sander is free of coarse chips and debris on the vibrator and collected in the tank to which circuit water is returned. Further, the pump is pumped through the sand separators by a screen separator in the case of a two-stage connection to the separator as well. The sieve separators divide the pulp stream into a good flow stream and into the refinery circuit stream.

Claims (1)

OBJECT OF THE INVENTION An apparatus for producing uniform quality wood pulp comprising an abrasive, a sifter, a sand separator, a sewing screen and a thickening device, characterized in that the stirred tank (1j is connected via a pump (2) and the inlet pipe (3j) to the refiner (4). and is provided with a level regulator (5), wherein the substance inlet pipe (3) is provided with a consistency regulator (6j) and a pressure sensor (7) and the refiner (4) is connected to a power regulator (9) via a control member (8); the control member (8) is connected to the speed controller (10) and the pressure sensor (11), and the outlet pipe (12) from the refiner (4) is provided with a flow sensor (13), which is connected to the control member (8).