JP2002529620A - Apparatus for supplying a fiber suspension on a forming wire of a paper machine - Google Patents

Abstract

(57) Abstract: An apparatus for supplying a fiber suspension onto a forming wire of a paper machine includes a cylindrical main body, a plurality of suction grooves, and one discharge groove. The rotor having a plurality of rotor blades mounted on the rotor is mounted within a cylindrical body. The flow of the suspension flows into the device from a plurality of dispersing devices through suction channels. The rotor agitates the flow of the suspension, so that the discharge channel results in a flow of the suspension having a uniform distribution of fibers over the width of the forming wire.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION

The present invention relates to an apparatus for producing various types of paper from fibrous raw materials by aerodynamic methods, and in particular, in the paper industry, a fiber suspension.
a device that can be used to supply a stream of rosuspension onto a forming wire.

[0002]

BACKGROUND OF THE INVENTION

The aerodynamic method of papermaking can be roughly divided into the following main steps. Grinding the fibrous raw material and separating it (ie, separating the ground material into individual fibers, and forming a fiber suspension);
Forming a layer of fibers on the forming wire, pressing and drying. In order to make the thickness and width of the paper web produced by the paper machine uniform, the uniformity of the fibers placed on the forming wire must meet the high demands. This is difficult to achieve, especially when producing large paper webs. In order to maintain a high production rate of the process in this case, several devices for separating the fibrous raw material into individual fibers (ie dispersing devices) are used to distribute the fibers evenly over the width of the web to be formed. The flow of the suspension is supplied to an apparatus that forms a single stream of the suspension in the suspension.

[0003] A paper web is dry-formed from a suspension of fibrous raw materials.
Devices for ming are known. One such device includes a chamber having a perforated bottom housing a rotor with a shell and a brush. The chamber features inlet and outlet connections and comprises a concentrator attached to the inlet connection. For example, the USSR Inventor's Certificate published on August 30, 1984 (Author's C
ertificate) No. 1110845, 3D 21 H 5/26, Information
See Bulletin No.32. The body of the concentrator is radially distorted in the direction of feed from the feed side and comprises a waste recovery bunker mounted on its larger radius wall, said body also directing the fiber flow. It features a partition which divides into two parts which are used for transport and for removing air, said partition being erected on the outlet side of the fibers. The air removal section comprises a number of separate blades. The concentrator is fed with a fiber suspension and a rotating baffle (turn
It features an additional part attached to the side with the ing baffle).

[0004] As the suspension stream enters the concentrator, the concentrator removes large particles into the waste collector and separates the suspension stream into a concentrated fiber stream and an air stream. The air is removed and the suspension stream is fed to a rotor with brushes. If the brush interacts with the porous bottom, further breakage of the fiber flakes will occur. The separated fibers pass through the bottom porosity and accumulate on the forming wire. However, since the dispersion embodied by the rotor with the brush is located directly adjacent to the forming wire, it is necessary to precisely control the flow rate of the fiber suspension passing through the opening at the bottom of the chamber in one unit time. The structural uniformity of the produced paper web is disrupted. This apparatus also fails to produce a uniform suspension flow to produce large paper webs, generally at the increasing speeds of aerodynamic methods. That is, the streams from several dispersing devices cannot be focused into a single suspension stream in which the fibers are evenly distributed over the width of the formed web.

[0005] Other devices for dry web formation include cylindrical fiber feed pipes with longitudinal slots used to feed the fibers dispersed on a continuous forming wire. For example, the USSR Inventor's Certificate published on May 7, 1985 (Author's C
ertificate) No. 1154400, 4D 21 H 5/26, Information
See Bulletin No.17. The slot portion of the pipe is tapered in the direction of wire movement. The pipe is set at an angle of less than 90 degrees with respect to the wire axis, and its inclination angle is adjustable. The pipe is in the form of a set of slot rings mounted along the pipe, each ring comprising means for uniformly distributing the fibers across the width of the wire, characterized by a catch. A suction box is placed below the wire to provide controlled vacuum generation. Uniform deposition of fibers across the wire width requires the same number of fibers per pipe length on the wire at the beginning and end of the slot. This condition is provided by the tapered shape of the pipe. An adjustment ring that controls the degree of opening of the slot at any point along the length of the pipe is used for fine adjustment of the flow. In each particular case, the described apparatus is simple in design, despite the great effort expended in adjusting the apparatus to different forming speeds. Further, the device cannot supply a uniform stream of fibers from some dispersing devices.

[0006] An apparatus for defibrillation of fibrous raw materials which is believed to be closest to the claimed invention has been published on July 7, 1980 by the Author's Cer.
tificate) No. 746007, 2D21D1 / 34, Information Bull
etin No.25. The apparatus comprises a stator designed as a concentric nested pipe with a cylindrical body, a rotor and a disk carrying partition. The partition and the disk form a ring-shaped channel that extends along the axis of the body. The fiber suspension from the individual disperser is fed through the groove. Secure the coaxial throttling to both sides of the disc. The rotor comprises two support disks resting on the outer pipe of a stator having bearings. The support disk is interconnected with fixed blades along its periphery, thereby forming a fan. Fan blades feature a rotor disk attached to them. The disk carries concentric throttling on both sides. The concentric ring of the rotor is coaxial with the concentric ring of the stator. Sieve
e) is mounted around the rotor at a predetermined distance therefrom.

[0007] The device comprises a connector for supplying and removing the fiber suspension. The apparatus combines a dispersing function with the creation of a suspension stream in which the fibers are evenly distributed over the width of the formed web. The flow of the suspension from the individual dispersers is supplied to the rotor through grooves. The flow drawn by the rotor blades alternately collides with the rotating ring of the rotor and the stationary ring of the stator, determining the distribution method.

[0008] The fully dispersed fibers are fed by a sieve inside the apparatus, where the fibers pass through openings in the bottom part of the body and are fed onto the forming wire of a paper machine. Such a design results in a uniform deposition of fibers across the width of the wire, thus making it possible to produce a papermaking machine that actually has any acceptable width required to produce paper. However, as mentioned above, the combination of the dispersion function and the dispersion of the fiber suspension over the width of the forming wire reduces the structural uniformity of the formed web and further complicates the overall device design. I do. The presence of the sieve causes a significant reduction in the production capacity of the device.

[0009]

Summary of the Invention

Thus, the present invention provides an apparatus that is structurally simple and that can increase the structural uniformity of the formed paper web.

According to the present invention, an apparatus for supplying a flow of a fiber suspension onto a forming wire of a paper machine comprises a plurality of suction channels (inputs) for directing the flow of the suspension from a cylindrical body. groove)
And a cylindrical body having A rotor having an outer surface and an axial length is mounted within a cylindrical body. A plurality of rotor blades, each having an axial dimension, are mounted on the rotor in a radial arrangement. Further, the suction groove and the discharge groove (output groove) are arranged outside the cylindrical main body, and are oriented tangentially to the rotation direction of the rotor.

According to one particular embodiment of the invention, in the form of a diffusing and focusing passage, a suction groove can be constructed which diffuses axially and radially with respect to the cylindrical body. . Each diffusing and focusing passage has a diffusing portion that is axially oriented with respect to the cylindrical body and a focusing portion that is radially oriented with respect to the cylindrical body. According to such an embodiment, the flow of the suspension can be substantially dispersed in the axial direction before flowing into the cylindrical body.

According to another embodiment of the present invention, the discharge groove may feature a bend at an outlet of the cylindrical body. The bend functions to direct the discharge groove in a direction opposite to the rotation of the rotor.

[0013] The rotor blade has an axial dimension that is half (1/2) the length of the rotor.
Is formed so as not to exceed the length. Furthermore, the blades are preferably arranged alternately on the rotor surface in order to improve the stirring of the suspension.

The location of the suction and discharge grooves on the exterior of the body and tangential to the direction of rotation of the rotor is from some dispersing devices into the active agitation area created in the cylindrical body by rotation of the rotor. Provides a free supply of the suspension stream. The diffusely focused shape of the suction channel results in additional axial redistribution of the suspension flow entering the cylindrical body, thus accelerating the mixing process. Further, when the bend is provided at the outlet of the main body, the fiber bundle (cluster) from the flow of the suspension is prevented from reaching the discharge groove,
Prevents deposition on formed wire. Specifically, the clusters are transported by recirculating the suspension stream and mixed again by the rotor. If the blades are shorter than half the length of the rotor and are staggered on the rotor surface,
Conditions are established for the additional axial redispersion of the suspension stream, and better mixing of the suspension stream is achieved. As a result, the flow of the suspension supplied from the discharge channel onto the forming wire is characterized by a uniform distribution of the fibers over the width of the web to be formed.

DETAILED DESCRIPTION OF THE INVENTION Referring to FIGS. 1 and 2, the apparatus of the present invention extends tangentially to the direction of rotation of a rotor 3 having a cylindrical body 1 and a supporting blade 4 on its outer surface. Outgoing suction groove 2
And a discharge groove 5. The rotor 3 has an axial length dimensioned in a direction parallel to the rotation axis of the rotor. Each of the blades 5 has an axial dimension parallel to the axial length of the rotor 3. The axial dimension of the blade 5 is preferably no longer than half the axial length of the rotor. The suction groove 2 can be formed as a diffusion focusing path. Further, as shown in FIG. 2, the discharge groove 5 can be directed in the direction opposite to the rotation direction of the rotor 3 by the bend 6 at the outlet of the cylindrical main body 1. Alternatively, the discharge grooves 5 can be oriented in the same direction as the rotation of the rotor 3, as shown in FIG.

Next, the operation of the apparatus will be described with reference to FIGS. The fan (not shown)
The flow of the suspension from the dispersing device (not shown) is supplied to the suction channel 2 of the device. When the suction groove 2 is formed as a diffusion focusing path, as shown in FIG. 2, the flow of the supplied suspension expands in the axial direction of the cylindrical main body 1 and flows into the cylindrical main body 1. Focus in the radial direction. As a result of such redispersion, the flow of the suspension is largely dispersed in the axial direction and is supplied to the space between the body 1 and the rotor 3.

As the suspension flow moves through the cylindrical body 1, it reaches an active agitation zone created by a blade 4 mounted on a rotor 3 (see FIG. 3). The blades 4 draw part of the overall flow into a flow that rotates (or circulates) around the rotor 3. The steady pressure drop caused by the blade 4 is caused by air-suspended fiber.
) Creates additional circulating flow exhibited by the vortex of the internal blades which enhances the agitation.
As shown in FIG. 2, when the ejection groove 5 is characterized by the bend 6, as many clusters of fibers as possible are formed in the bend 6 depending on the direction of the flow of the suspension caused by the centrifugal force. Blocked from entering. The clusters are carried away by the circulating flow, broken up by the blades 4 of the rotor 3 and mixed again.

Thus, a suspension stream in which the fibers are evenly distributed over the entire width of the forming wire is generated by relatively simple means. Such a flow allows the formation of a large paper web with increased uniformity.

Although the present invention has been described with embodiments that are presently considered to be the most practical and preferred embodiments, the present invention is not limited to the disclosed embodiments, but rather the spirit and scope of the appended claims. It is to be understood that various modifications included within the scope as well as equivalent configurations are intended.

[Brief description of the drawings]

FIG. 1 is a perspective view of an apparatus for supplying a fiber suspension, according to one embodiment of the present invention.

FIG. 2 is a perspective view of an apparatus for supplying a fiber suspension according to another embodiment of the present invention.

FIG. 3 is a perspective view of an embodiment of a rotor for use with an apparatus for delivering a fiber suspension.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical main body 2 Suction groove 3 Rotor 4 Blade 5 Discharge groove 6 Bend

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Claims (13)

[Claims] 1. An apparatus for supplying a fiber suspension onto a forming wire of a paper machine, the apparatus comprising: a plurality of suction channels for receiving a flow of the fiber suspension; A cylindrical body having a discharge groove for directing a suspension contained from the body; a rotor mounted within the cylindrical body, the rotor having an outer surface and an axial length; A plurality of rotor blades attached to the rotor in an arrangement,
A rotor blade having a predetermined axial dimension, wherein the plurality of suction grooves and the discharge grooves are arranged outside the cylindrical main body,
A device that is oriented tangentially to the direction of rotation of the rotor. 2. The diffusion focusing passage having a diffusing portion axially oriented with respect to the cylindrical body and a focusing portion radially oriented with respect to the cylindrical body. The device of claim 1 formed as: 3. The apparatus according to claim 1, wherein said discharge groove comprises a bend at an outlet of said cylindrical body, said bend directing said discharge groove in a direction opposite to a direction of rotation of said rotor. 4. The discharge groove according to claim 1, wherein the discharge groove is oriented in a rotation direction of the rotor.
An apparatus according to claim 1. 5. The apparatus according to claim 1, wherein the rotor blades are fixed alternately. 6. The apparatus of claim 1, wherein the axial dimension of the rotor blade does not exceed half the axial length of the rotor. 7. The apparatus according to claim 1, wherein the plurality of suction grooves include two suction grooves. 8. A method for supplying a flow of a fiber suspension onto a forming wire of a paper machine, comprising the steps of: accommodating the flow of the suspension from a plurality of dispersing devices to a supply device; Agitating said flow of said suspension; and depositing said flow of agitated suspension on said forming wire. 9. The step of accommodating includes the step of accommodating the flow of the suspension from the plurality of dispersing devices to the supply device through a corresponding plurality of suction grooves of the supply device. The method described in. 10. A diffusion focusing passage having at least one of the plurality of suction grooves having a diffusion portion in an axial direction with respect to the supply device and a focusing portion in a radial direction with respect to the supply device. The method of claim 9 comprising: 11. The agitating step includes agitating the flow of the suspension using a rotor mounted in the supply device, the rotor comprising a plurality of radially arranged rotor blades. 9. The method of claim 8, comprising: 12. The step of depositing further comprises, prior to the step of depositing, passing the flow of the suspension through a discharge groove of the supply device.
An apparatus according to claim 1. 13. An apparatus for supplying a fiber suspension on a forming wire of a paper machine, the apparatus having an axially extending internal suction groove for supplying a flow of the fiber suspension. A cylindrical body, a discharge groove for the flow of the suspension, and a rotor mounted inside the body, wherein the rotor is designed as a cylinder with blades and the suction and discharge grooves Is disposed externally of said body in a direction tangential to the direction of rotation of said rotor, said rotor blades being fixed radially on said rotor having an outer surface.