JPH0482985A - Apparatus for washing, dehydrating and concentrating paper stock - Google Patents

Abstract

PURPOSE:To obtain the subject apparatus capable of efficiently washing, dehydrating and concentrating a paper stock and miniaturizing a dehydrating drum by forming a siphon chamber in the dehydrating drum on the inner surface side of a filtration unit and dipping the lower side part of the siphon chamber in the dehydrating drum in a white water reservoir means. CONSTITUTION:A siphon chamber 8 in a dehydrating (siphon) drum 4 is formed on the inner surface side of a filtration unit 6 and the side part of the dehydrating drum is dipped in a paper stock tank 10 to suck white water in a paper stock suspension 2 into the siphon chamber. The lower side part of the siphon chamber is dipped in a white water tank 14 to store the white water therein.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a washing, dehydrating, and concentrating apparatus for paper stock, which is used for washing, dewatering, and concentrating paper stock in paperboard making and the like.

[Conventional technology]

In general, waste paper such as newspapers and magazines is used as the main raw material for paperboard making, and the waste paper is crushed to form a stock suspension to wash, dehydrate, and concentrate the paper stock. be exposed. That is, since waste paper is mixed with ink, white clay, etc., by suspending the paper stock in white water as a paper stock suspension, cleaning is performed to remove impurities from the paper stock suspension together with white water (i.e., bleaching) and dewatering, resulting in a thickening of the stock. The cleaning, dewatering, and concentrating processes of the paper stock affect the quality of the paperboard product, and the processing speed affects the paperboard manufacturing efficiency and product cost. Conventionally, there are two types of washing, dewatering and concentrating apparatuses for paper stocks: a single drum system consisting of a single dewatering drum, and a double drum system comprising a pair of dewatering drums. In addition, filtration types include those using only water head pressure, those using water head pressure and a self-suction siphon in combination, and those using water head pressure and forced suction siphon in combination.

[Problem to be solved by the invention]

By the way, in a paper stock cleaning, dehydration and concentration apparatus, a dehydration drum is immersed in a paper stock suspension, white water in the paper stock suspension is permeated into the dehydration drum, and the paper stock suspension is applied to the surface of the paper stock suspension by rotation of the dehydration drum. The purpose is to make the paper stock in the liquid adhere. In this type of system, the rotation of the dehydration drum has a large effect on the amount of paper stock deposited, and in order to obtain a sufficient amount of output, a long filtration time is required, so the rotation of the dehydration drum must be kept low. . For this reason, products using such a low-rotation dewatering drum have a drawback of low production efficiency. In addition, there is a cleaning, dehydrating, and concentrating device that immerses a dehydrating drum in the paper stock suspension to separate water from the paper stock suspension, thereby increasing the paper stock concentration of the paper stock suspension in which the dehydrating drum is immersed. be. In this method, the relationship between the accumulated amount of paper stock suspension and the volume of the dewatering drum greatly influences the paper stock dewatering efficiency. If sufficient dehydration is to be achieved using such a washing, dehydrating and concentrating device, the diameter of the dehydration drum, which is immersed in the container that collects the paper stock suspension, must be increased to increase the contact area with the paper stock suspension. death,
Furthermore, by increasing the volume, it is necessary to ensure a sufficient water level difference between the paper stock suspension and the water level. Therefore, in this method, the overall equipment including the dewatering drum becomes larger, which increases the installation area.The larger dewatering drum also increases the driving force, resulting in increased power consumption and product cost. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a washing, dehydrating, and concentrating apparatus for paper stock, which achieves efficient washing, dewatering, and concentration of paper stock as well as miniaturization of the dewatering drum.

[Means to solve the problem]

That is, the paper stock washing, dehydration and concentration apparatus of the present invention is provided with a filter (6) capable of separating the paper stock (18) from the paper stock suspension (2) on the peripheral surface thereof, and the above-mentioned A dewatering drum (siphon drum 4) having a siphon chamber (8) formed on the inner surface of the filter body to attract a paper stock suspension and suck white water (12) in the paper stock suspension; A stock suspension supply means (stock tank 10) that supplies the paper stock suspension to the side surface of the drum and brings the stock suspension into contact with the filter body, and a lower surface of the dewatering drum J1. a water storage means (white water pump 14) installed in the section to store the white water sucked into the siphon chamber from the paper stock suspension and to immerse the lower side part of the siphon chamber of the dehydration drum in the white water; It is equipped with the following. Further, the paper stock washing, dewatering and concentrating apparatus of the present invention includes first and second dewatering drums (siphon-on drum 4A) which have the same structure as the dewatering drum and whose peripheral surfaces can be brought into pressure contact with each other.
, 4B), a stock suspension supply means installed on the side surfaces of the first and second dewatering drums to bring the stock suspension into contact with the side surfaces of the dewatering drums; a water storage means installed on the lower side of the second dehydration drum to store the white water sucked into the siphon chamber, and immersing the lower side of the siphon chamber of the dehydration drum in the white water; It is prepared.

[For production]

According to the paper stock cleaning, dewatering and concentrating apparatus of the present invention, the stock suspension supplied to the side surface of the dehydration drum through the stock suspension supply means is absorbed by the suction action of the siphon chamber as the dehydration drum rotates. It is attracted and attached to the filter by gravity. When the paper stock suspension adhering to the filter body is exposed to the outside air from the paper stock suspension in the paper stock suspension supply means as the dewatering drum rotates, the paper stock suspension on the filter body is exposed to the outside air. The white water is selectively suctioned by the suction action of the siphon chamber and the filter, thereby simultaneously washing, dewatering, and concentrating the stock. Further, according to the paper stock washing, dewatering and concentrating apparatus of the present invention, the stock suspension supplied to the side surfaces of the first and second dewatering drums is siphoned by the siphon as the first and second dewatering drums rotate. Due to the suction action of the chamber, the water is drawn to the filter body of each dehydration 1-ram (
= J gets kicked and I finish 1st. When the paper stock suspension adhering to the filter body of the lB2 water drum is exposed to the outside air, it undergoes the first stage of washing, dehydration, and concentration by the suction action of the siphon chamber, and then undergoes the first and second dehydration stages. The second
Dehydration and concentration of stages are carried out. That is, according to this paper stock dewatering apparatus, in addition to the dewatering action of the siphon chamber, the dewatering action of the dehydration drum is added to the dewatering action by pressure contact, thereby performing powerful washing, dewatering, and concentration.

[Embodiments] The present invention will be described in detail below with reference to embodiments shown in the drawings. (First Embodiment) FIG. 1 shows a first embodiment of the paper stock washing, dehydration and concentration apparatus of the present invention. A siphon-on drum 4 is installed as a cylindrical dewatering drum for dewatering the paper stock suspension 2 in this washing, dewatering and concentrating device.
A filter body 6 is provided for selectively filtering only the paper stock by allowing impurities such as white clay and white water to pass therethrough. A plurality of siphon chambers 8 serve as dehydration means to draw water upward.
is formed. A stock tank 10 is installed on the side of the siphon-on-drum 4 as a stock suspension supply means for supplying the stock suspension 2 to be dehydrated to the side of the siphon-on-drum 4. The stock tank 10 is set at a height that covers the side surface of the siphon-on drum 4 with the stock suspension 2, and the stock suspension 2 is continuously supplied through the stock supply pipe 11 provided at the bottom. is supplied to Further, a white water tank 14 is installed on the lower side of the siphon-on drum 4 as a water storage means for storing white water 12 obtained by dehydrating the paper stock suspension 2 and immersing the siphon-on drum 4 in the white water 12. has been done. In this embodiment, the stock tank 10 and the white water tank 14 are connected to the seal wall 1
separated by 6. In the vicinity of this seal wall 16, there is a paper stock B8 that has been deposited on the filter body 6 of the siphon-on drum 4.
A clean water nozzle 17 is installed as a cleaning means for cleaning the paper stock with fresh water, and the siphon-on drum 4, which has been cleaned and whose filtration capacity has been increased, is transferred to the paper stock tank 10 side. A pressure roll 20 is installed on the side of the siphon-on drum 4, that is, on the side facing the paper stock tank 10, for pressing the paper stock 18 on the siphon-on drum 4 for forced dehydration. A peeling means is provided on the lower side of the pressure roll 20 for peeling off the paper stock 18 adhering to the filter body 6 of the siphon-on drum 4 in accordance with the rotation of the siphon-on drum 4.
A lid 22 is installed with its tip side in contact with the surface of the filter body 6. Similarly, on the pressure roll 20 side, a doctor 23 is installed as a peeling means for peeling off the paper stock 18 adhering to the pressure roll 20, with its tip in contact with the roll surface. Below these 1ζ containers 22, 23, a stock take-out section 24 is installed as a take-out means for taking out the paper stock 18 that has peeled off and fallen. A broking device 25 is installed in the stock take-out section 24 for crushing the stock 18 to be taken out by rotation of stirring blades. The siphon-on drum 4 is supported by a support shaft 26 installed at its center, and as shown in FIGS. 2 and 3, a support frame 28 installed at the end of the siphon-on drum 4 It is rotatably supported by bearings 32.34 mounted on the .30. Support frame 2 days,
A swing arm 29.31 is attached to the swing arm 29.31 as a shock absorbing means via a tire-shaped pressure adjustment bellows 33, and a pressure roll is attached to the swing arm 29.31 in parallel with the support shaft 26 of the siphon-on drum 4. 20 is rotatably supported by a bearing 38.40 with a support shaft 36,
The pressure roll 20 is applied to the siphon drum 4 with appropriate pressure.
is pressed against the surface of the filter body 6. As shown in FIG. 4 and FIG.
2.44 is fixed, and a support cylinder 46 is fixed between these fixed base parts 42.44. A plurality of partition plates 48 forming flanges are attached to the support tube 46 at regular intervals using fixing portions 50. Each partition plate 48 is a side wall plate of the siphon chamber 8, and forms a unit of the siphon chamber 8 in the axial direction. As shown in FIG. 6, the siphon chamber 8 is formed of a partition plate 48 and a siphon chute 52 that forms two partition walls made of curved plates. The portion 56 has a large opening, and the inner opening 58 has a small opening. A stay 60 spanning the partition plate 48 is attached to the outer opening 56, and the inner opening 58 is reinforced with a reinforcing piece 62. Wallet-on chute 5 facing the outer opening 56
As shown in FIG. 7, at the end of the 2, a 7-shaped white water receiver 64 is formed that is convex in the rotational direction of the siphon-on drum 4, and the stay 60 also has a white water receiver 64 in the same manner as the siphon-on chute 52. A white water receiver 66 is formed. In FIG. 6, arrows A and B represent the suction action that occurs when the siphon-on drum 4 rotates in the direction of arrow C. A perforated plate 68, a lower screen 70, and an upper screen 72, which constitute the filter body 6, are wound around the peripheral surface of the siphon-on drum 4 in a layered manner. The perforated plate 68 is a punching board in which countless holes are formed, and the lower screen 70 is made of wire with a large mesh,
A wire with a small mesh is used for the upper mesh 72. With this configuration, the stock 18 can be efficiently separated from the stock suspension 2 and dehydrated. As shown in FIG. 8, the stock supply pipe 11 installed at the bottom of the stock tank 10 and the stock tank 10 are connected by a plurality of branch pipes 74. A tapered distribution pipe with an inclined bottom is used for the paper stock supply pipe II, and the stock suspension 2 is supplied from one end through a pressure pump 76, and the stock suspension 2 is supplied through a valve 78 at the other end. Collected in suspension storage. The arrow indicates the flow direction of the stock suspension 2. Further, as shown in FIG. 9, the broking device 25 installed in the paper stock take-out section 24 is a rotary drum 82 that is rotated by a rotating shaft 80 and has a large number of spiral stirring blades 84 attached thereto. The falling paper stock 18 is pulverized by the stirring blade 84 and gathered in the direction shown by arrow E, and then passed through the discharge hole 85.
It is something that is discharged from With the above structure, as shown in FIG. can be brought into contact with the stock suspension 2. The lower side of the siphon-on drum 4 is submerged in the white water 12, and the siphon chamber 8 is also immersed therein, so when the siphon-on drum 4 is rotated in the direction shown by arrow F, it is submerged in the white water tank 14. The opening surface of the siphon chamber 8 on the filter body 6 side moves to the paper stock tank 10, but the white water 12 is in the siphon chamber 8.
is maintained. The white water 12 that has risen together with the siphon chamber 8 is subjected to a strong gravitational force, the height of which is the water head, and a water head pressure proportional to the height acts on the siphon chamber 8. That is, this water head pressure acts on the filter body 6 side as a suction force. Due to the suction action of the siphon chamber 8, the filter body 6
The paper stock suspension 2 or the paper stock 18 is attracted to and adheres to the surface of the paper. White water 12 containing impurities such as clay and ink is sucked into the siphon chamber 8 from the paper stock suspension 2 or the paper stock 18 adhering to the surface of the filter body 6 by the suction of the siphon chamber 8 in the outside air. Become. In this case, the paper stock suspension 2 to the paper stock 18 on the filter body 6 are also naturally dehydrated by gravity, and the white water 12 enters the siphon chamber 8 side. Therefore, due to such suction action and gravity action, only the paper stock 18 selectively remains on the filter body 6, and the paper stock 18 is washed, dehydrated, and concentrated at the same time. After such first stage dehydration treatment, the siphon-on drum 4
As the material rotates, it is guided to the pressure welding roll 20 side and is pressed against
A second stage dehydration process is performed. After a strong dewatering process is performed by pressing the pressure roll 20, the paper stock 18 adhering to the siphon-on drum 4 is peeled off by the doctor 22 by the rotation of the siphon-on drum 4, and is transferred to the paper stock removal section 24. Fall. At this time, the paper stock 18 adhering to the pressure roll 20 is also peeled off by the tractor 23 and falls into the paper stock take-out section 24 . Then, the white water receiver 6 formed in the siphon-on chute 52
4. A filter body 6 is installed in the white water receiver 66 formed on the stay 60.
The white water 12 falling from the filter body is stored, and the white water 12 is prevented from returning to the filter body 6 as the siphon-on drum 4 rotates. Further, the filter body 6 of the siphon-on drum 4 has a seal wall 16
Blow fresh water from the fresh water nozzle 17 provided near the;
After being washed and washed, it is transferred to the stock tank 10. As a result, the stable adsorption capacity of the stock 18 in the stock suspension 2 is maintained, and the efficiency of washing, dehydration, and concentration of the stock 18 can be increased. (Second Embodiment) Next, FIG. 11 shows a second embodiment of the paper stock washing, dehydration and concentration apparatus of the present invention. This cleaning dehydration concentrator is equipped with first and second siphon-on drums 4A and 4B, and two siphon-on drums 4A and 4B are installed.
, 4B are brought into contact with each other at an appropriate pressure, and the paper stock tank 1 is attached to the side surface of the siphon-on drums 4A and 4B.
0 is installed to bring the stock suspension 2 into contact with it, and a white water tank 14 is installed on the lower side of each siphon-on drum 4A, 4B.
A stock removal section 24 is installed below the pressure contact portion of each siphon-on drum 4A, 4B. The siphon-on drums 4A and 4B are supported by a support shaft 26 attached to the center thereof, as shown in FIGS. 12 and 1.
As shown in FIG. 3, support frames 86 and 88 are installed on the end surfaces of the siphon-on drums 4A and 4B, and bearings 90.
The siphon-on drum 4A is rotatably supported by 92. Further, a swing arm 96.98 is attached to the support frame 86.88 as a buffering means, for example, via a tire-shaped pressure adjustment bellows 94. 26 is rotatably supported by bearings 100, 102, and the siphon-on drums 4A, 4B are pressed together with appropriate pressure. In FIGS. 12 and 13, arrow G indicates the flow of stock suspension 2, and arrow H indicates the flow of white water 12. According to such a configuration, as shown in FIG. When 4B is rotated, the stock suspension 2 is sucked onto the surface of the filter body 6 of the siphon drums 4A and 4B by the suction action of the siphon chamber 8 and the action of gravity. The paper stock suspension 2 attached to the surface of the filter body 6 by this suction is washed, dehydrated, and concentrated by suctioning the white water 12 by the suction action of the siphon chamber 8 and the natural dehydration action by gravity in the outside air. As the siphon-on drums 4A and 4B rotate, they are guided to the pressure contact portions of the two and are pressed into contact with each other. After a strong dewatering process is performed by pressing the siphon-on drums 4A and 4B, the paper stock 18 adhering to the siphon-on drums 4A and 4B is peeled off by the doctor 22 as the siphon-on drums 4 rotate, and the paper material 18 is peeled off by the doctor 22 as shown by the arrow. It is removed as shown in . The above operations are performed continuously, and the wallet-on-drum 4A,
The paper stock 18 is washed, dehydrated, and concentrated in accordance with the rotational speed of the paper stock 4B. In this way, when the pair of siphon-on drums 4A and 4B are brought into pressure contact, the pressure roll 20 becomes unnecessary, and the two siphon-on drums 4
By using A, 413, in addition to the siphon action, the dehydration action by pressure contact is added, and as a result, the paper stock 18 can be continuously subjected to powerful washing, dehydration, and concentration. Therefore, in such a washing dehydration concentrator, a high siphon suction pressure can be obtained due to the high water level difference, and since the dehydration time is long, the initial dehydration capacity is enhanced and the dehydration efficiency is increased. In addition, since the moisture content of the paper stock 18 adhering to the siphon-on drums 4A, 4B can be lowered, a high nip can be applied by surface nipping pressure and line nipping pressure at the contact parts of the siphon-on drums 4A, 4B. According to experiments, the moisture content of the extracted paper stock 18 was reduced by 30 to 30% compared to conventional processing.
A decrease of 35% or more was confirmed. Further, even if the rotation speed of the siphon-on drums 4A, 4B is increased, a dehydration effect can be obtained, and the processing capacity can be increased by increasing the rotation speed. In addition, since the dewatering action does not directly depend on the diameter of the siphon-on drums 4A and 4B, there is no need to make their diameters extremely large, and the installation area can be expected to be reduced, reducing driving force, etc.
It is also possible to reduce processing costs. (Other Examples) Next, FIG. 15 shows a paper making apparatus to which the paper stock washing, dehydrating and concentrating apparatus of the present invention is applied. In this papermaking apparatus, a conveying felt 104 is guided onto the upper surface of the siphon-on drum 4, and a couch roll 106 installed on the upper surface of the conveying felt 104 is brought into pressure contact with the siphon-on drum 4 via the conveying felt 104. The configuration of the siphon-on drum 4 is the same as that of the first embodiment, and a paper stock tank 10 is installed on the side surface of the drum to bring the paper stock suspension 2 into contact with it, and a white water tank 1 is installed on the lower side of the drum.
4 are installed. With this configuration, when the siphon-on drum 4 is rotated in the direction indicated by the arrow, the paper stock suspension 2 adheres to the filter body 6 and is dehydrated, and the conveying felt 104 is conveyed in the direction indicated by the arrow M. The stock 18 can be attached to the lower surface of the paper by pressing the couch roll 106. In order to carry out such processing in stages, the conveying felt 10
If a plurality of siphon-on drums 4 are installed on the lower surface of the transport felt 104, a plurality of paper layers can be formed on the lower surface of the conveying felt 104, and for example, paperboard can be made. Next, FIGS. 16 and 17 show other embodiments of the siphon-on-drum. The siphon-on drum 4 has a wire 10 on the surface of the perforated plate 68.
8 may be wrapped around it for reinforcement. In this way, when used in a paper making machine, the abrasion resistance can be increased and it is effective for forming a paper layer. Further, a spiral rib 110 for guiding the white water 12 may be installed in the siphon-on drum 4 between the support tube 46 and the siphon-on chamber 8. In this way, the white water 12 can be guided in a predetermined direction, and a suction effect by the spiral ribs 110 can be expected as the siphon-on drum 4 rotates. Further, a wire mesh can be used for the lower mesh 70 and the upper mesh 72, but the same effect can be expected by using a wire mesh having a triangular cross section wrapped around the mesh. [Effects of the Invention] As explained above, according to the present invention, the following effects can be obtained. (a) The size of the dewatering drum can be suppressed, the installation area can be reduced, and the paper stock can be efficiently washed, dehydrated, and concentrated, contributing to the manufacture of high-quality paperboard and reducing production costs. It is possible to reduce the (b) Since the stock suspension is supplied to the side of the dewatering drum, the dewatering drum comes into contact with the stock suspension over a wide area, and the amount of paper stock attached is increased by the suction action of the siphon chamber. This allows for efficient dehydration. (C) In addition to the dehydration caused by the suction effect of the Seifmen chamber, the dehydration effect caused by the pressure contact between the first and second dehydration drums is added, so that the dewatering efficiency can be increased.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the paper stock washing, dehydration and concentration apparatus of the present invention, FIG. 2 is a front view showing the paper stock washing, dehydration and concentration apparatus shown in FIG. 1, and FIG. is a plan view showing the washing, dehydrating and concentrating apparatus for paper stocks shown in FIG. 1; FIG. 4 is a partially cutaway side view showing the siphon-on drum in the washing, dehydrating and concentrating apparatus for paper stock shown in FIG. 1; Fig. 5 is a side sectional view of the siphon-on drum shown in Fig. 4, Fig. 6 is a perspective view showing the siphon chamber in the siphon-on drum shown in Fig. 4, and Fig. 7 is the knife shown in Fig. 4. 8 is a cross-sectional view showing the white water receiver of the siphon chamber in the on-drum, FIG. FIG.
11 is a sectional view showing a second embodiment of the paper stock washing, dehydrating and concentrating device of the present invention; FIG. 12 is a diagram showing the operation of the paper stock washing, dehydrating and concentrating device shown in FIG. FIG. 13 is a vertical sectional view showing the washing, dehydrating, and concentrating device for paper stock shown in FIG. 11; FIG. 14 is a plan view showing the washing, dehydrating, and concentrating device for paper stock shown in FIG. FIG. 15 is a sectional view showing a paper making apparatus using the paper stock cleaning, dehydration and concentration device of the present invention; FIGS. 16 and 17 are diagrams showing the operation of the paper stock washing, dehydration and concentration device of the present invention FIG. 7 is a partially cutaway side view showing another embodiment of the siphon-on drum in the device. 2...Paper stock suspension 4...Siph-on-drum (dehydration drum) 4A...
Siphon-on drum (first dewatering drum) 4B... Siphon-on drum (second dewatering drum) 6... Filter body 8... Siphon-on chamber 10... Paper stock tank (paper stock suspension) Supply means) 12.
・・White water 14・・White water tank (water storage means) 18・Paper stock funeral map Figure 7 (Cross-sectional view showing the white water receiver of the siphon chamber in the 1st ram of the siphon) Figure

Claims (1)

[Scope of Claims] 1. A filter body capable of separating paper stock from a paper stock suspension is disposed on the peripheral surface, and the paper stock suspension is attracted through the filter body, and the paper stock suspension is drawn into the paper stock suspension. a dehydration drum having a siphon chamber formed on the inner surface of the filter body for sucking white water; a paper stock suspension supply means installed on the lower side of the dewatering drum to store the white water sucked from the paper stock suspension into the siphon chamber; a water storage means for soaking a lower side part of the siphon chamber, the stock suspension supplied to the side part of the dewatering drum through the paper stock suspension supply means to the siphon as the dewatering drum rotates. Washing and dehydration of paper stock, characterized in that the paper stock is washed, dehydrated and concentrated by attracting the white water onto the filter body by the suction action of the chamber and sucking the white water from the paper stock suspension. Concentrator. 2. A siphon that has a filter on its peripheral surface that can separate the paper stock from the paper stock suspension, attracts the paper stock suspension through the filter, and sucks white water in the paper stock suspension. first and second dewatering drums in which a chamber is formed on the inner surface of the filter body so that the peripheral surface can be brought into pressure contact; and the paper stock suspension is applied to the side surfaces of the first and second dewatering drums. a paper stock suspension supply means for supplying the paper stock suspension and bringing the paper stock suspension into contact with the filter bodies of the first and second dewatering drums; installed on the lower side portions of the first and second dewatering drums; a water storage means for storing the white water sucked into the siphon chamber from the stock suspension, and immersing the lower side of the siphon chamber of the dehydration drum in the white water; The paper stock suspension supplied to the side surfaces of the first and second dewatering drums is attracted and adhered to the filter body by the suction action of the siphon chamber as the first and second dewatering drums rotate. , suctioning and dewatering the white water from the paper material suspension, and washing the paper material on the filter body by pressing the first and second dehydration drums together;
A washing, dehydrating and concentrating device for paper material, characterized in that it performs dehydration and concentration.