JPS61258091A - Apparatus for concentrating aqueous suspension of papermaking pulp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The pulp and paper industry has commonly used chambers to concentrate pulp and stock for many years for storage or other preliminary processing. The most commonly used device is known as a forming machine, and its main parts are a cylinder covered with a wire-V and a basin in which the cylinder rotates, making it relatively comparable in structure and mode of operation to cylinder-type paper machines. can.

In operation, the concentrated pulp accumulates on the surface of the mold and is then dumped or transferred from the surface of the mold for transport to a storage tank or other subsequent location.

Formers are relatively expensive because they occupy considerable floor space and are fairly complex parts of the paper machine, including the structural framework for the filtration wire. Furthermore, in part, it is necessary to keep the rotational speed of the cylinder mold below a value that would prevent centrifugal force from ejecting the concentrated pulp from the surface of the mold, and the surface speed of the cylinder mold is generally only 200-300 feet/min. range, the formula device is necessarily slow in action.

Therefore, one main object of the present invention is that it is less expensive to manufacture and maintain than conventional thickeners, occupies less floor space than conventional thickeners, and takes up significantly less floor space than conventional thickeners. It is an object of the present invention to provide a device for thickening pulp and stock that can operate at high speeds and thus replace conventional thickeners, which are much larger and more expensive.

The crimped cod of the present invention is quite different from a form machine and more closely resembles a twin wire vertical paper machine. Instead of a cylinder type, the present invention uses a pair of endless perforated belts, one inside the other, similar to the forming wire of a paper machine, and connects the belts at the inlet end of the device with a gap between the two. Guide it around the open rolls and converge from these rolls to the third
wraps around the roll, thereby forming an approximately ■-shaped space in which the stock is conveyed to be concentrated. The main parts of the equipment are a relatively large imperforate roll of wire, a minimal number of other rolls, and a screw conveyor that discharges the concentrated pulp to one side of the machine.

According to one aspect of the invention, a large imperforate roll and a second
rolls are rotatably mounted on the frame at intervals, drive means are provided for the larger rolls, and a plurality of other rolls are rotatably mounted on the frame. A headbox attached to the rolls includes an outlet for the pulp suspension to be concentrated opposite a large a-ru, and a pair of endless wires are connected to the two first-mentioned rolls and one of the other rolls. The several other rolls are positioned to guide the wire as separate parts from the second roll in a diverging relationship surrounding the headbox and then converging with each other to wrap around the larger roll. , whereby the outlet of the headbox directs the pulp suspension into the spaces between the converging wire sections where it is compressed between these wires and then moved around a large roll in a wire-sandwich relationship. For those with other rolls, place this sandwich-like thing on the second roll from the larger roll.
positioned to guide the roll in a wrapping relationship,
holding the wire under tension to cause the wire-pulp-wire sandwich to squeeze liquid through the wire as it moves from a large roll to a second roll, thereby concentrating the pulp between the wires; Grain means are mounted on the frame between the second roll and the headbox and between the separate wire sections as a device for recovering the concentrated pulp.

1 - After one month of operation, the headbox drains the pulp slurry to be concentrated by gravity through the inner wire and then the short, nearly horizontal section of the inner wire converges with the outer wire V section on the surface of the large roll. Place it on the top. The resulting wire pulp wire sandwich is wrapped around the majority of the larger roll, so that the sandwich reverses direction and then wraps around additional rolls until it completes the majority of the loop. exercise around,
Drain from the outer wire during that exercise.

When the sandwich reaches this position, the wires separate from each other and pass in bifurcated relationship above and below the tray in which the concentrated pulp is collected, and above and below the headbox. The wire then continues to operate by receiving a continuous stream of pulp slurry from the headbox while the screw conveyor in the convergence channel again delivers the previously collected pulp to a discharge point on one side of the apparatus. While moving in convergent relation, the two wires exert considerable pressure on the pulp between them as they are wound around successive rolls, thereby squeezing the liquid through the outer wires for each roll. Hold it in a fairly tense state so that it comes out.

One of the most important advantages of the device of the invention is that the pulp to be dewatered is enclosed between two wires during the dewatering stage, thus increasing the dewatering action without limiting the centrifugal forces as in the case of regular molds. Therefore, it can be operated at considerably higher speeds than conventional S compressors. Thus, where regular molds cannot be safely operated at appreciable speeds of 250 feet/minute or more, the apparatus of the present invention has a practical speed range as high as 2500 feet/minute or more. There is.

Furthermore, the apparatus of the invention is considerably simpler and requires less floor space than conventional concentrators. More specifically,
Since the two wires follow the same path for most of their length, a minimum number of rolls are required. This will be pointed out below regarding preferred embodiments of the invention.

Yet another advantage is the ability to drain relatively thin fiber mats through both wires thereby facilitating effective removal of inks, chemicals and fillers when the apparatus of the present invention can be used in pulp washing operations.

Friend-1-1 The illustrated concentrator of the invention has upper and lower side beams 12.13 on each side thereof and lateral struts 14.13 at appropriate locations.
It comprises a relatively simple frame comprising two columns 10.degree. 11 connected to each other by 15. A large flat roll 20, which is the main working element of the device according to the invention, is mounted by pillow block bearings 19 on the twin columns 10.degree. is driven via the drive belt 21. A smaller shed roll 23 is attached to the pair of pillars 1 by means of bearings 24.
1 and another flat roll 25 is attached to roll 20.23.
It is attached to the upper pair of beams 12 at a lower height than the roll 23 at a point in between.

The rolls 20.23.25, together with the tension rolls described below, support inner and outer endless wires 30.31, the term "wire" as used herein being defined as any suitable metal, plastic or textile material, knitted or otherwise. Includes a perforated belt. Both belts have large rolls 2
0 and from this roll it moves downwardly at an angle to the vertical until it wraps around the guide and tension roll 33 and from this roll it moves upwardly at a small angle to the roll 23. The two wires diverge from each other as they leave the roll 23, the outer wire 31 running directly up to the larger roll 20 while the inner wire 30
moves downwardly in wrapping relation to a tension guide roll 35, and from this roll upwards around a fixed roll 25 to a larger roll 20.

The tension guide roll 33 is mounted on a bearing of an arm 40 which is pivotally connected to the column 11 at a point 41. side beam 1
A jack 42 attached to each of the arms 4G at a position indicated by a reference numeral 43 controls the pivot movement of the arm 4G to move the roll 3
3 tension the wire by moving equally. The roll 35 is similarly attached to an arm 44 which is pivotally attached to the column 11 at a point 45, and the pivot movement of this arm is controlled by a jack 46 attached to the column 11 by a bracket 47.
Controlled by

With the rolls 20, 23, 25, 30 arranged in this manner, the inner wire 30 moves generally horizontally from roll 25 to roll 20, while the outer wire 31 moves from roll 23 in a converging relationship with the horizontal movement of wire 30. Two wires are guided at the top of the device for direct movement onto the rolls 20. A headbox 50 is attached to the side beam 12 in the space between the separated portions of the two wires, the slicing outlet 50 of this headbox projects toward the converging wire and the roll 20, and the headbox 50 is condensed. There is an inlet 5 on one side of the equipment to receive the pulp slurry.
The side beam 12 having a roll 20.2 also has a roll 20.2.
A drain plate 55 is provided between the rolls 5 and 5, and the wire 30 is connected to the roll 2.
As it moves from 5 to roll 20, it passes through the horizontal section of wire 30 to receive the liquid that drains.

A groove 60 is also attached to the side beam 12 between the head box 50 and the column 11, and wires 30 and 31 are connected to the roll 2.
3 receives concentrated pulp from these wires as they leave the wire. A doctor blade 61 is mounted along the upper edge of the grate 60 to remove pulp from the top surface of the wire 30 as it leaves the roll 23 and direct it into the grate 60. A second doctor blade 62 is mounted above the lower side of the gutter 60 to remove any pulp that may adhere to the lower side of the wire 31. A conveyor screw 65 is mounted at the bottom of the gutter 60 and a drive 66 is provided to convey the pulp accumulating in the gutter 60 to an outlet 67 at the front end of the gutter.

In operation, the headbox 50 feeds the pulp to be concentrated from the slicing outlet 51 onto the top of the moving wire 30 to the roll 20 in much the same way as in a 7-odori paper machine. The liquid draining by gravity through this part of the wire 30 is collected in a pan 50 to one side of the machine where it is removed, and as this liquid initially drains freely through the bare wire, a significant amount 25 rolls of white water
．． The wire 30 is passed between the wires 30 and 30 and removed.

As the two wires converge on the surface of the roll 20, they form a sandwich with the pulp as filler surrounding the roll 20, and according to the invention the wires 3
When 1 is placed under considerable tension, this wire presses the pulp against the roll 2o, so that as the sandwich wraps around this roll, it dewaters considerably and the liquid passes through the outer wire. A drain pan 70 of suitable contour surrounds the wrapped surface of the roll 2o to receive the water squeezed out through the wire 31 as the sandwich wraps around the roll 2o;
This water is thrown into the pan by centrifugal force when the surface speed of roll 20 is relatively high. A white water outlet 11 is provided at the bottom end of the drain dish 7o.

1[n72 is a suitable material which underlies the portion of the wire pulp wire sandwich fitted between posts 10.11 and which extends from roll 2o to roll 30 and surrounds the wrapped portion of the wire 33 This drain pan 75 has a white water lower part 7. Drainage continues through wire 31 due to gravity and tension, and this drainage increases around roll 33 due to centrifugal force. The final part of the sandwich has already been described; this end part is finally separated from the wire part around the rolls 23 and the concentrated pulp is placed in the sieve 60.

The advantages of the present invention, including in particular its extreme simplicity, will be apparent from the foregoing description.

Not only is the wire the only part that wears out (the normally necessary need for laterally guiding the wire is eliminated by providing a roll such as that shown in Figures 3 and 4, which roll has a Circumferential grooves 8 mating to the tongue strips 82, 83 on the inner surfaces of the two wires
0.81 is provided, and the outer wire 31 is connected to the inner wire 3.
0, so that the edge strip with the tongue-like strip 83 overlaps the edge of the wire 30.

At the point where the wires 30, 31 separate from each other, water should be applied to clean them. A Java vibe 85 attached to the pillar 1o sprays Java water onto the wire portion extending from the roll 20 to the roll 3o. The Java water falls on the convergent part of the wire, but the M of the Jin water is so small that it does not have much of an effect.

A similar Java Vibe 86 is attached to side beam 12 and sprays water onto a 3° section of wire extending from roll 35 to roll 25, and this water is applied to a dish 88 attached to beam 13 and connected to a white water collection system. Discharge.

Using only 36 inches wide wire, 20 25 inch diameter rolls, and a device with horizontal dimensions of 104 inches long and 12 inches wide, the belt was tested for 10 passes at a belt speed of 2000 to 2500 feet per minute. Te 0.5
Pulp slurry supplied at a concentration of 10 to 15%
The efficiency and effectiveness of the device of the present invention has already been demonstrated by being able to concentrate up to a concentration of . The incomparability with conventional concentrators is emphasized by the fact that the same production requires two conventional shaped molds, each with a 36 inch diameter cylinder mold having a 120 inch surface. Furthermore, in order to prevent the pulp from being ejected from the surface, it is necessary to keep the speed of the cylinder mold low in the case of regular molds, but the centrifugal force is generated when the W/pulp/wire sandwich wraps around the roll 20. In the device of the present invention, centrifugal force contributes to the effectiveness of the device by forcing the liquid through the wire.

Another significant advantage of the invention is that the device is simple in construction and maintenance. It is generally accepted that the only parts that wear heavily are the two wires, and that these wires are wearable elements that require replacement from time to time, just like paper machine wires. It is also in sharp contrast to conventional practice, which requires more complex and costly repair work when the filter wire of a regular cylinder type wears out, including draining the trough and/or removing the cylinder type from the trough. be. Therefore, while the on-hand time is quite good in conventional concentrators, the on-hand time is the shortest in the device of the present invention.

Although the format described above is one preferred embodiment of the present invention, it is necessary to understand that the present invention is not limited to this specific embodiment and can be modified in various ways within the scope of the claims set forth above. .

[Brief explanation of drawings]

FIG. 1 is a side view of the concentrating device of the present invention with a part of the support frame cut away, FIG. 2 is a top view of the device of FIG. 1 with wires removed, and FIG. A side partial view of the large roll and adjacent sections of wire, FIG.
It is a partial elevation view seen from the right side to the left side of the figure. (5 other people)

Claims (1)

Claims: 1) (a) means 10-15 for forming a frame; (b) a first roll 20 and a second roll 23 rotatably mounted in spaced relation to the frame;
(c) drive means 22 for the first roll; (d) a plurality of other rolls 25, 33, 35 rotatably mounted on the frame; and (e) a first roll mounted on the frame. (f) a pair of rolls supported on one of the rolls, including a first roll 20 and a second roll 23; Endless wire 30, 3
1 and (g) other rolls 25 and 35 with wires first
(h) guiding the first roll 23 into separate parts that move in a mutually separated relationship and wrapping the headbox 50 therebetween and positioning them to converge with each other and wrap around the first roll; (h) thereby an outlet 51 of the headbox conveys the pulp suspension into the space between the convergent portions of the wire to cause it to be compressed between the convergent portions of the wire and then moved in a sandwich-like relationship around the first roll 20; ) positioning some of the other rolls to guide the wire-pulp-wire sandwich in wrapping relation to the second roll; (k) a head box 50 and a second roll 23; (k) a head box 50 and a second roll 23; Apparatus for concentrating an aqueous suspension of papermaking pulp, characterized in that it comprises means 60 mounted between the wires and between separate wire sections in a position for recovering the condensed pulp from the wire. 2) a roll 20 that guides the wire portions in a convergent relationship;
23, 25 are positioned to guide the converging section along a generally horizontal path, and the outlet 51 of the headbox means is positioned to direct the pulp suspension to be concentrated into the lower part of the converging wire section. Devices in scope 1. 3) A device according to claim 1, in which one of the endless wires (30) is wrapped within the other (31). 4) The first roll 20 is provided with a first circumferential groove 81 near one end thereof and a second circumferential groove 80 midway between the two ends so that the inner part 30 of the wire is provided with a first circumferential groove 81. is provided with a guide strip 82 on its inner surface that engages the second groove;
The edge trip of the outer one of the wires 31 extends laterally beyond the inner wire and is provided on its inner surface with a guide strip 83 which engages a first groove 81 of the first roll. Devices in scope 3. 5) (a) means 10-15 for forming a frame; (b) a relatively large flat roll 20 rotatably mounted on one end of the frame and provided with drive means; and (c) the other end of the frame. (d) a first wire support roll 23 rotatably mounted at a height above the large roll 20; (e) a third wire support roll 35 rotatably mounted on the frame at a location lower than the second wire support roll 25;
(f) an outer endless wire guided around the large roll 20 and the first support roll 23 such that the upper portion of the wire moves directly from the first support roll 23 to the large roll 20; 31 and (g) wraps the large roll 20, the first support roll 23 and the second support roll and is guided under the third support roll 35 so that the outer wire is removed from the outer wire at the surface of the first support roll 23; It branches and passes downwardly to the third support roll 23 and passes under it to the second support roll 25 and then runs from the second support roll 25 almost horizontally to the larger roll 20 to the upper part of the outer wire 30. an inner endless wire 30; (h) feeding the pulp suspension to be concentrated onto the upper portion of the inner wire and compressing it between the converging portions of the wire and then passing the pulp suspension around the large roll 20 into a first Support roll 23
headbox means 50 for moving the wire in a sandwich relationship until (i) the wire is held in tension so that the wire-pulp-wire sandwich wraps around the large roll and squeezes liquid through the outer wire; (j) means 60 provided in the frame between the wires branching at a point intermediate between the first support roll and the headbox means for recovering the concentrated pulp from the wires; Equipment for concentrating a suspension of paper pulp in water. 6) Also mounted on the opposite end of the frame from the large roll 20 at a level below the first support roll 20, a wire-pulp-wire sandwich covers most of the surface of the first support roll. a first roll 33 which is wrapped under tension through an outer wire so that additional liquid can be squeezed out;
6. The apparatus of claim 5, comprising: 7) means 44 for mounting the tension holding means on the frame so as to swing the third support roll 35 and the fifth roll 33;
46 and means 47, 42 for controlling the rocking of the rolls to adjust the tension of the wire.
Section equipment.