SU757622A1 - Device for transforming fiber air suspension flow - Google Patents

Description

The invention relates to devices for converting the flow of aerospace fibers and can be used in the pulp and paper industry in aerodynamic forming devices for the manufacture by dry method of various types of paper from natural, including wood-pulp, artificial, synthetic fibers.

A device is known for converting the flow of aerospace of fibers, including a body and a flat nozzle installed in the body for supplying the flow of aerospace fibers, consisting of converging front and side walls, the planes of which are mutually perpendicular [1].

Such a device allows you to increase the concentration of fibers in the stream of their aeroforms, for example, up to 10 -

40 g / m Λ, instead of the usual 5.0 -

15.0 g / m \

However, increasing the concentration of fibers in the specified limits in the flow of their aerospace is insufficient.

The aim of the invention is to increase the concentration of fibers in the aerospace flow and ensure uniform flow.

2

This is achieved by the fact that the side walls of the nozzle are parallel to each other, and the body has partitions installed under the nozzle with a gap between them, adjacent to its side walls at an angle of 120-160 ⁴ , and pipes for air exhaust, each partition consists of motionless part and mobile, imposed by the plane on a motionless part, and the gap between mobile partitions makes 1,1 -

1.5 of the distance between the converging front walls.

The invention is illustrated by drawings, where in FIG. 1 shows a general view of the device, and FIG. 2 is a section A — A of the device in FIG. one.

The device consists of a body 1, a flat nozzle 2 installed in it for supplying a flow of aerospace fibers, consisting of converging front walls 3 and side walls 4 parallel to each other, in the lower part the body has partitions installed under the nozzle with a gap between them, adjacent to it side walls at an angle of 120-160 °, with each partition consists of a fixed part 5 and a movable 6,

3

757622

four

homogeneous fibrous layer develops,

which then enters the sizing device and the subsequent processing envisaged by the technology.

imposed by its plane on the fixed part and having the ability to move in such a way that the gap between the movable partitions is 1 / 1-1.5 of the distance between the converging front walls <

nozzles, to the top of the casing attached nozzles 7 for air exhaust. The housing of the device is adjacent to the known forming device, consisting of a chamber 8, an endless grid 9 and a suction box 10.

The device works as follows.

The flow of aerospace of the fibers enters the flat nozzle 2. Due to the fact that the nozzle has converging front walls 15 and parallel side walls 4 - the cross-sectional area of the nozzle decreases, as a result, the flow velocity of the aerosol suspension increases, and the flow is preloaded velocity field. The air suspension flow leaving the nozzle encounters resistance from the inclined partitions 5 and 6, with the result that a significant part of the air changes its direction of movement, it goes to the upper part of body 1, and then goes out of the device through nozzles 7.

At the same time, fibers having a density greater than air density, under the action of inertial forces, continue their movement in the same direction as at the moment of exit from the nozzle. Due to this, the concentration of fibers in the flow of their aerospace ³

increases according to calculations of 2.0—

2.5 times.

Having passed in the gap between the inclined partitions 5 and 6, the concentrated flow of aerospace fibers moves to the forming device. In the chamber. 8 from a concentrated air flow of fibers using a suction box. 10 through the move-. The net 9 is sucked off by the remaining 45 air. As a result, on the grid 9 rev.

This device allows the paper to be formed by the dry method at higher speeds of 150–200 m / min with economically feasible size of the forming devices, according to calculations, to reduce by 10% the power consumption when separating media at the time of forming the paper sheet.

Claims (2)

Claim , 1. A device for converting the flow of aerospace of fibers, including a body and a flat nozzle installed in the body for supplying a flow of aerospace fibers, consisting of converging frontal and side walls, the planes of which are mutually perpendicular, characterized in that, in order to increase the concentration of fibers in the air suspension flow and ensure uniformity of flow, the side walls of the nozzle are parallel to one another, and the body has partitions installed under the nozzle, with a gap between them, adjacent to its side walls n one angle of 120 - 160 ^p , and pipes for air exhaust. 2. The device according to claim 1, in that each partition consists of a fixed hour, tee and a movable, superimposed by its plane on the fixed part, and the gap between the movable partitions is 1.1-1.5 of the distance between the converging parts. frontal walls.