SU1110845A1 - Apparatus for dry forming of paper from flow of aerosuspension of fibrous material - Google Patents

Abstract

1. A DEVICE FOR DRY FORMING PAPER FROM AIR SURVEY OF A FIBER MATERIAL containing a chamber with a perforated bottom, a rotor with a shell and brushes installed in it, the power supply and discharge branch pipe and the concentrator mounted on the supply branch of the panel are mounted on a special part of a panel, which is mounted on a power supply, and the hub mounted on the supply branch is seated with a part of a piece of a piece of board, one of the part of the panel, one of the part of one of the part of the top of a piece of a piece of board, one of the part of one of a piece of a piece of material, one of the part of a piece of board, one of the part of a piece of a piece of board, one with a piece of board, one with a piece of material, one part of a piece of material, one part of a piece of material, one part of a piece of material, one part of a part of a part of the part of the body, one is se- ries, one is a piece of board, one is attached to one part of one of the part of the top of the panel, one is attached to one. forming web and device performance,. the hub case is bent on the side of the material feed into it in the direction of the air suspension of fibers and equipped with a hopper for dumping waste from the stream installed on the wall with a large bend radius, and from the material exit side it has a partition dividing the body into sections transporting the cleaned stream and venting the air. 2. A device according to claim 1, characterized in that a series of separation blades is installed in the air extraction section. 3. The device according to claim 1, of l and C /} is that the concentrator has an additional section with a rotary partition installed on the side of the flow of the aerospace suspension of fibers into it. 4. The device according to claim 1, which is distinguished by the fact that the rotor shell is perforated, a fixed damper is installed inside the rotor in its upper part of the valve, eating a chamber formed from the air chamber equipped with a source of compressed air.

Description

The invention relates to a device for dry-forming paper and can be used in pulp and paper industry in the production of paper for various purposes. A device for producing a fibrous material is known, comprising a semi-cylindrical body with a perforated bottom, a rotor located inside the body with brushes mounted on it, an endless grid and a suction box underneath. It f The major disadvantages of this device are the low productivity and quality of the material produced, caused by the design of the supply nozzle and the absence of the outlet nozzle. It is also known a device for producing a fibrous material, comprising a housing with feed and discharge pipes, a perforated bottom for separating fibers and flakes, a rotor with brushes fixed on it, and a forming mesh with suction device 11 and a drawer underneath 23. A disadvantage of the known device is this structure a supply nozzle that prevents the use of a concentrated suspension of Fibers, which limits the performance of the device. In order to improve the shaping performance by using a concentrated suspension of fibers, devices (concentrators) are used to convert the air suspension flow of fibers. A known method of forming a fibrous layer is carried out on a device comprising a curvilinear chamber (concentrator) with nozzles for draining fibers and air t3. The disadvantages of the known device are inefficient flow separation, large losses of fiber entrained in air, and, as a result, low productivity. In addition, this device does not allow large particles to be removed from the aerospace and only slightly fluctuates the concentration of fibers in the stream, and all this reduces the quality of the material obtained. A device is known for converting a stream of aerosol suspension of fibers, which includes a curved forming chamber with a dividing partition by nozzles for supplying a suspension of fibers and draining fiber and air, as well as a nozzle mounted on the inlet end of the forming chamber t. . This device has high throughput and efficiently separates flow with minimal fiber loss. However, using it, it is impossible to remove large particles from the air suspension of fibers, for example, scraps of sheets of waste that, if they enter the forming device, can reduce its productivity and the quality of the material produced. A common disadvantage of the known concentrators is that they draw the velocity field profile, which in turn leads to uneven molding. The closest to the invention to the technical essence and the achieved result is a device for producing a fibrous material, including a housing with feed and discharge connections and a perforated bottom (grid), mounted in the housing with a rotor with brushes fixed on it, forming a grid with a suction drawer below, moreover, a concentrator is installed on the supply pipe, and the perforated bottom (mesh) can be subjected to vibration of an EZZ. A disadvantage of the known device is that it does not allow for the effective separation of aerospace and receive a highly concentrated fiber stream free from unseparable tufts on the hole in the feed tube, which reduces the performance of the device and the quality of the fibrous material obtained. The purpose of the invention is to improve the quality of the molded web and the performance of the device. The goal is achieved by the fact that, in a device for dry forming paper from an aerosol suspension of fibrous material, comprising a chamber with a perforated bottom, a rotor with a sheath and brushes installed in it, a power supply and a discharge branch pipe and a concentrator mounted on the power supply branch, the concentrator body is feeding the material into it is bent along the radius in the direction of the air suspension of fibers and equipped with a hopper for collecting waste from the stream installed on the wall with a large bend radius, and with a sto3 1

The areas of the material leaving it have a partition, dividing the body into the sections for transporting the cleaned stream and venting the air.

In the section of the exhaust air is installed a number of separation blades.

The hub has, in addition, a section with a pivoting partition, installed on the supply side to the (His) air suspension of fibers.

The rotor shell is perforated, inside the rotor in its upper, and a fixed damper is installed, which forms an air chamber with a rotor shell and is equipped with a pipe for connection to a source of compressed air.

FIG. 1 shows the device, a general view; in fig. 2 - the same, with a perforated rotor shell; in fig. 3 is a view A of FIG. 2

A device for dry-forming paper from an aerospace flow consists of a chamber 1 with a feed nozzle 2, a perforated bottom 3 and a discharge nozzle 4 installed inside the chamber 1 of the rotor 5 with brushes 6 and mounted on the feed nozzle con. centralizer 7. The upper part 8 of the concentrator 7 is bent along the radius in the direction of the air suspension of the fibers and provided with a bunker 9 for collecting waste from the stream mounted on the wall with a large bend radius. Bunier 9 for collecting waste communicates with the concentrator 7 through a slot opening. The size of the slotted hole can be adjusted, for example, using a special valve or a moving part of the wall of the concentrator 7.

On the exit side of the material from the concentrator 7, a partition 10 is installed, dividing the body into the transport sections of the cleaned stream 11 and the exhaust air 12.

A rotor 5 with a plurality of rigid brushes 6 disposed thereon is mounted inside the chamber 1 and is driven by a DC motor (not shown). The position of the rotor 5 is adjusted in height, and in its lower position the brushes 6 touch the perforated bottom 3 of the chamber 1.

The size of the holes in the perforated bottom 3 depends on the length of the processed hair.

The perforated bottom can be subjected to vibration, which increases 08454

em permeability perforation, and hence the performance of the device.

All internal surfaces of the device must be smooth or made with an anti-adhesive coating to prevent the fibers from sticking to them.

In the air exhaust section 12 of the concentrator 7 of the rator 7, a number of separation blades 13 and a pipe 14 for exhausting air are additionally installed. A number of times, the dividing blades 13 are installed under. an angle of 5-50 to the vertical, the planes of the blades 13 are parallel to each other and form an angle of up to 80 with the horizontal; The blades 13 are attached to the side walls of section 12, and their width is equal to the width of the section.

20 Hub 7 has an additional section 15 with a pivoting partition 16 mounted on the side of the flow of a suspension of suspended fibers into it.

25 Shell 17 of the rotor 5 can be

Perforated. Inside, the rotor 5, in its upper part, is fixed a fixed flap 18, which forms an air chamber with a nozzle 19 for connection with a source of compressed air with the shell 17 of the rotor 5.

The device works as follows.

The flow of aerospace fibers served in

35 a concentrator 7, in the upper part of which fibers under the action of centrifugal force move along a wall with a large radius of curvature, and air

fills the rest of the space.

Closest to the wall are the undivided scraps of cellulose, which, due to the slight vacuum created in the waste collection bin 9, are removed from the stream through a slot. At the same time, due to the vacuum in the bunker 9, the profile of the sex velocity in the aerospace flow is equalized, which increases the uniformity of the molding.

The fibers continue to move along the wall with a large radius of curvature. Thus, in the upper part 8 of the concentrator 7, large particles are removed, for example, shreds of cellulose, and the aerosol suspension is divided into two streams: the concentrated fiber flow entering section 11 and the air flow. : 5 J

section 12, from which it is removed, for example, for recycling. The separation of flows is the more complete, the higher the speed at the entrance to the hub 7.

By adjusting the slit width with a damper or by moving a part of the wall of a section with a large radius adjacent to the hopper 9 to receive waste, it is possible to adjust the size and number of particles removed from the flow in order to achieve an optimal result in each particular case.

A longitudinal partition 10 between sections 11 and 12 is necessary to prevent mixing of these two streams and to prevent the fibers from being caught by the outgoing air flow.

The flow of fibers from section 11 of the post, drinks through the supply pipe 2 into the chamber 1.

The rotating rotor 5 with brushes 6 picks up all the incoming fibers and transfers them to the perforated bottom 3. When the brushes 6 interact with the perforated bottom 3, the formed flakes of fibers are destroyed. The individual fibers pass through the holes in the perforated bottom 3 and are deposited on the forming fabric under the action of a vacuum created by the suction box of the paper machine.

When the rotor 5 rotates, the brushes 6 carry away the intact flakes of fibers and throw them into the outlet nozzle 4, through which they are removed from the device. Air flow coming in with a small amount over 8456

the fibers seized by it in section 12, meets a number of separation vanes 13, changes its direction of movement, passes through the gaps between, and the blades 13, and exits through pipe 14.

Fibers trapped in section 12 with air have a greater density than air, and under the action of inertial forces continue to move down past the vanes 13 and also through the feeding nozzle 2 and enter the chamber S.

The execution of the shell 17 of the rotor 5 perforated intensifies the operation of the device. Through the nozzle 19 for supplying air into the rotor, air enters, which, due to the vacuum created by the suction box under the forming mesh, passes through the perforated rotor shell 17 of the rotor 5 from the opposite fixed flap 18 and is removed from the device through the perforated bottom 3 and partially through the outlet Connecting nozzle 4. A fixed valve 18 prevents air from passing through the shell 17 in the direction of the feeding nozzle 2, which can lead to flocculation.

The table shows the comparative data of samples of fibrous material obtained by the proposed device and the device selected for the prototype. The comparison was carried out by estimating the irregularity of the oscillations of the sample lumen using the MF-4 microphotometer with the ESh1V-60M and EPR-09MZ self-recording potentiometers connected to it.

100% bleached pulp sulphite

100% bleached pulp sulphate

100% cotton pulp

18

nineteen

27

15

26

24

23

32

thirty

35 711 As follows from the table, the unevenness of laboratory samples obtained on the proposed device is 4-12% less than on the device chosen for the prototype. This allows you to increase strength indicators by about 15–20%. Thus, when using the device, pulpation is mediated58: fiber concentration, unseparated cellulose scraps are removed from the flow, the velocity velocity profile is leveled, and a concentrated fiber flow enters the device inlet. This contributes to obtaining a uniform fibrous material, improving its quality and improving the performance of the device.

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To Fan

Forming

grid

FIG. one

Buff A

.2

Claims (4)

1. DEVICE FOR DRY FORMING OF PAPER FROM AERO SUSPENSION FLOW OF FIBROUS MATERIAL, containing a chamber with a perforated bottom, a rotor with a shell and brushes installed in it, a supply and outlet pipe and a hub fixed to the supply pipe, characterized in that webs and performance apparatus' body hub by feeding into it the material is bent at radii sous ⁴ in feed direction aerosuspension of fibers and is provided with a hopper for the discharge of waste from a flow FITTED on the wall with a large bending radius, and the exit side of the material it has a partition dividing the housing into sections of the transport stream and the purified air outlet. 2. The device according to p. ^ Characterized in that a number of dividing vanes are installed in the air exhaust section. § 3. The device as claimed in claim 1, wherein the concentrator ζ / j torus has an additional section with a rotary partition installed on the supply side of the fiber aero suspension stream into it. 4. The device according to π. 1, it is noteworthy that the rotor shell is perforated, a fixed shutter is installed inside the rotor in its upper part, forming an air chamber with the rotor shell, equipped with a pipe for connecting to a source of compressed air. > inside there are suction 10