JP6858428B1 - Filter manufacturing method and filter manufacturing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a filter reinforced based on a filter paper or the like so that a number of times of reuse can be obtained significantly higher than that of a filter paper alone. A filter manufacturing apparatus 20 includes a filter skeleton supply section 21, a reinforcing layer forming section 22, a drying fixing section 23, and a filter winding section 24, and is wound around the filter skeleton supply section 21 in a roll shape. In the filter skeleton 11, the reinforcing layer (cellulose nanofiber layer) 12 is laminated on one side (lower surface) of the reinforcing layer forming portion 22 as a thin film layer having a required thickness by adsorption, and then the moisture is removed by the drying fixing portion 23. After that, a roll pressure is applied, and the filter is further dried by a heater roll or the like. Finally, the filter F1 is wound in a roll shape by the filter winding unit 24, and the reinforcing layer 12 is laminated and fixed on one side of the filter frame 11. Can be manufactured. [Selection diagram] Fig. 4

Description

The present invention relates to a filter manufacturing method and a filter manufacturing apparatus, and more particularly to a reusable filter manufacturing method and a filter manufacturing apparatus that allow an aqueous liquid to flow and capture solid impurities in the aqueous liquid.

The coolant liquid, which is supplied to the surface to be processed of a metal workpiece in grinding work, etc. and used for lubrication, cooling, rinsing, etc., contains metal chips, solids such as abrasive grains, and lubricating oil. It contains impure oil such as rust preventive oil. For this reason, continuing to use the coolant in a circulating manner causes a decrease in grinding accuracy and, in turn, a decrease in the quality of the workpiece.

Therefore, the filter is set from the rolled state to the state of blocking the flow of the aqueous liquid containing solid impurities, and the filter is continuously moved in the plane direction. Then, the aqueous liquid is passed through the filter and solid impurities are trapped (see Patent Documents 1 and 2).

The reference numerals used in the following description of Patent Documents 1 and 2 are the reference numerals used in the respective patent documents.

In the continuous filtration device shown in Patent Document 1, the filtration filter 4 drawn out from the roll body 3 is wound around the outer peripheral surface of the filtration drum 10 via the supply roller 20, and then the pollution tank is passed through the discharge roller 30. It is guided to the outside of No. 2, and by rotating the filtration drum 10 and the discharge roller 30, the filtration filter 4 is continuously wound around the filtration drum 10 and moved, and the pollutant liquid is caused by the negative pressure of the vacuum pump 5. The solid matter of 1 and the purification liquid can be separated by using the filtration filter 4 as a boundary surface, and the solid matter adhering to the filtration filter 4 can be collected together with the filtration filter 4 in the collection container 70 via the guide roller 60.

As described above, according to the continuous filtration device shown in Patent Document 1, the used filtration filter 4 is collected from the collection container 70 and incinerated in a state where solid matter is attached, and provides a technique for not reusing. There is.

If the filtration filter 4 must be disposed of after being used only once due to clogging, the cost of the filtration filter 4 increases, the environmental load increases, and the like. In order to repeatedly use the used filtration filter 4, the solid content adhering to the filter is separated and removed by brushing on the adhering surface, and then the cleaning water is vigorously sprayed from the side opposite to the adhering surface by nozzle injection. By doing so, it is necessary to clear the clogging of the filter and then separate / remove the impure oil adhering to the filter from the filter.

The cutting fluid filtration device shown in Patent Document 2 receives coarse-grained cutting debris in the liquid to be treated, which settles in the process of ascending between the bath plates 12, and slides it down. , It is received on the discharge conveyor 14 running on the inner bottom surface of the filtration tank 1, transported to the folded-back portion 14a, scraped off by the scraper 15, collected in the slurry box 16, and the liquid to be treated that has passed upward between the particle plates 12 is a screen belt. The lower traveling portion of the filter medium 27 is passed upward, and at this time, cutting chips having a fine particle size are captured by the screen belt filter medium 27.

When the screen belt filter medium 27 is used repeatedly, the mesh holes of the screen belt filter medium 27 are clogged with fine-grained cutting chips and the filter accuracy is lowered. Therefore, in order to remove the cutting chips, the screen belt filter medium 27 is brushed with the brush roller 40 during non-filtration. At the same time, the backwash nozzle 39 sprays the purifying liquid onto the back surface of the screen belt filter medium 27.

As described above, the cutting fluid filtration device shown in Patent Document 2 provides a technique for reusing the screen belt filter medium 27, and provides a technique for improving the cost performance of the screen belt filter medium 27.

Japanese Unexamined Patent Publication No. 2006-305430 Japanese Unexamined Patent Publication No. 58-170511

According to the cutting fluid filtration device shown in Patent Document 2, a technique capable of reusing the screen belt filter medium 27 is provided. However, no example of reusing the screen belt filter medium 27 shown in this technique has been found so far. Therefore, when the present inventor examined the reuse of the filter through experiments, it was found that there are the following problems.

First, the paper strength of filter paper decreases as the number of times it is reused increases. In particular, in order to reuse the filter paper, there is a process of brushing the surface to which the solid content of the filter paper is attached to sweep off the solid content, and the filter paper is wound and wound, so that the filter paper greatly reduces the paper strength. It is supposed to be done. Further, when the filter paper greatly reduces the paper strength, the mesh holes are greatly expanded, and the filtration performance is deteriorated.

Furthermore, when the filter paper reduces the paper strength, wrinkles occur and the flatness is impaired, and the initial band-like linear shape becomes meandering, and it becomes impossible to wind it into a beautiful roll shape, and when the filter paper reduces the paper strength, , The side edge of the filter cracks during filtration, and in addition to cracking once, wrinkles occur, which causes the filter paper to be wrapped around and the tension that changes significantly when running is not smooth, causing stress concentration in the cracks. There is a danger that the paper will burst when it suddenly develops into a large crack.

If the filter paper bursts during filtration, not only is it time-consuming to replace the filter paper, but the filtered liquid is mixed with the unfiltered liquid, and the filtration must be restarted from the beginning. It becomes a big problem.

Therefore, there is a demand to keep the number of times the filter paper reused small from the viewpoint of safety that the filter paper does not burst. Therefore, it is possible to collect data on the required number of reuses for each type of filter, which may cause small cracks on the side edges, and use it with the number of reuses smaller than the minimum number of reuses. This is a problem-solving method.

On the other hand, one other problem-solving method is to improve the cost performance of the filter material by devising a method for increasing the number of times of reuse of commercially available filter paper and filter cloth. In the above situation, conventionally, no improvement proposal has been found to significantly increase the number of times the filter paper can be reused.

The present invention has been made to solve such a problem, and provides a filter manufacturing method and a filter manufacturing apparatus strengthened based on a filter paper or the like so that a number of times of reuse can be obtained significantly higher than that of a filter paper alone. The purpose is to do.

The first and second filter manufacturing methods and the first and second filter manufacturing apparatus according to the present invention are both laminated on a filter skeleton having mesh holes and one surface of the filter skeleton in order to achieve the above object. A filter in which a cellulose nanofiber layer, which is a reinforcing layer, is wound in a roll shape, and the filter is unwound from the rolled state and contains fine-grained solid impurities. In a state where the flow passage is blocked and continuously moved, the liquid to be treated is passed through the mesh holes, and the solid impurities are trapped on the filter surface without flowing.

The filter manufacturing method of the first aspect according to the present invention is
As a series of processing steps for obtaining the filter by providing the reinforcing layer on one surface of the filter skeleton and winding the filter skeleton in a roll shape, the reinforcing layer is provided on one surface of the filter skeleton. A reinforcing layer forming step of forming the cellulose nanofibers to be a layer in a film shape, and a drying fixing step of drying and pressing the laminated cellulose nanofiber layers while the filter skeleton is running. ,
The drying fixing step includes a filter winding step of winding the filter skeleton having the cellulose nanofiber layer formed on one surface in a roll shape to obtain the filter that can be reused as an impurity treatment apparatus filter.

The filter manufacturing method of the first aspect according to the present invention is
In the reinforcing layer forming step, the filter skeleton that is unwound from the rolled state is placed in a fiber laminating treatment tank that stores a reinforcing layer forming liquid in which cellulose nanofibers are dispersed in water at a required ratio. In the suction box provided in the rotating drum, the guide is wound around the cylindrical net portion of a rotating drum having a cylindrical net portion provided to be driven and rotated in the fiber laminating processing tank or rotatably provided. By discharging the liquid to the outside of the tank, the hydraulic pressure in the suction box is reduced to be lower than the hydraulic pressure of the reinforcing layer forming liquid on the outer periphery of the rotary drum, and the outer circumference of the rotary drum is reduced under the action of this depressurization. The cellulose nanofibers that allow the water content of the reinforcing layer forming liquid to pass through the mesh holes of the filter skeleton and are dispersed in the reinforcing layer forming liquid are not allowed to pass through, but are laminated on the surface of the filter skeleton to form the cellulose nanofibers. It is a configuration for processing to form a fiber layer.

Next, the filter manufacturing method of the second aspect according to the present invention is
As a series of processing steps in which the filter skeleton is rolled out from a rolled state and the reinforcing layer is provided on one surface of the filter skeleton, the cellulose nanofibers serving as the reinforcing layer are filmed on one surface of the filter skeleton. The first step of forming the reinforcing layer to be formed in a shape and the first drying fixing step of fixing the laminated cellulose nanofiber layer to the filter skeleton by drying and pressing while the filter skeleton is running. 1 As a series of treatment steps for obtaining the filter by providing the reinforcing layer on the other surface of the filter skeleton after the treatment in the drying fixing step, the other surface on the opposite side of the reinforcing layer formed on the filter skeleton. In the second reinforcing layer forming step of forming the cellulose nanofibers to be the reinforcing layer in a film shape, and to the filter skeleton that dries and presses the laminated cellulose nanofiber layers while the filter skeleton is running. An impurity treatment device that includes a second drying and fixing step of fixing, and further winds the filter skeleton in which the cellulose nanofiber layers are formed on both sides of the filter skeleton after finishing the treatment of the second drying and fixing step in a roll shape. The filter includes a filter winding step of obtaining the reusable filter.

Then, the first reinforcing layer forming step and the second reinforcing layer forming step in the filter manufacturing method of the second aspect according to the present invention are performed.
The filter skeleton is guided into a fiber laminating treatment tank that stores a reinforcing layer forming liquid in which cellulose nanofibers are dispersed in water at a required ratio, and is driven to rotate or rotate in the fiber laminating processing tank. The hydraulic pressure in the suction box is released by winding the liquid in the suction box provided in the rotary drum and discharging the liquid in the suction box provided in the rotary drum to the outside of the tank. The pressure is reduced so as to be lower than the hydraulic pressure of the reinforcing layer forming liquid on the outer periphery of the rotating drum, and under the action of this reduced pressure, the water content of the reinforcing layer forming liquid on the outer periphery of the rotating drum is allowed to flow through the mesh holes of the filter frame. In addition, the cellulose nanofibers dispersed in the reinforcing layer forming liquid are not allowed to flow, but are laminated on the surface of the filter frame to form a cellulose nanofiber layer.

The filter manufacturing apparatus of the first aspect according to the present invention is
A series in which the filter skeleton is unwound from a rolled state and traveled, the reinforcing layer is provided on one surface of the filter skeleton, dried and fixed, and wound into a roll shape that can be reused for an impurity treatment device filter to obtain the filter. As the treatment means, the reinforcing layer forming portion for forming the cellulose nanofibers to be the reinforcing layer in a film shape on one side of the filter skeleton and the laminated cellulose nanofiber layers are dried while the filter skeleton is running. The dry fixing portion to be fixed to the filter skeleton to be pressed and the filter skeleton having the cellulose nanofiber layer formed on one side after the treatment of the dry fixing portion can be wound into a roll and reused as an impurity treatment device filter. The configuration is provided with a filter winding unit for obtaining the above-mentioned filter.

Then, the reinforcing layer forming portion of the filter manufacturing apparatus of the first aspect according to the present invention is
A fiber laminating treatment tank that stores a reinforcing layer forming liquid in which cellulose nanofibers are dispersed in water at a required ratio, and a cylindrical net portion that is driven and rotated or rotatably provided in the fiber laminating treatment tank. The rotating drum having the structure, the arc-shaped cylindrical portion close to the inner peripheral surface of the cylindrical net portion, and the arc-shaped cylindrical portion provided in the rotating drum and supported by the tank body to close the periphery other than the arc-shaped cylindrical portion to hold the arc-shaped cylindrical portion. A suction box having a box main body, a suction box provided through the box main body and the tank main body, and a drainage port for discharging the liquid in the box main body to the outside of the tank, is provided from the rolled state. The filter skeleton to be fed is wound around the cylindrical mesh portion of the rotating drum to run, and the liquid in the suction box is discharged to the outside of the tank, so that the hydraulic pressure in the suction box is released to the reinforcing layer on the outer periphery of the rotating drum. The pressure is reduced to be lower than the hydraulic pressure of the forming liquid, and under the action of this reducing pressure, the water content of the reinforcing layer forming liquid on the outer periphery of the rotating drum is passed through the mesh holes of the filter frame and dispersed in the reinforcing layer forming liquid. The cellulose nanofibers to be used are not allowed to flow, but are laminated on the surface of the filter frame to form a cellulose nanofiber layer.

Then, as a series of processing means in which the filter skeleton is rolled out from a rolled state and the reinforcing layer is provided on one surface of the filter skeleton to dry and fix the filter skeleton, the reinforcement is provided on the one surface of the filter skeleton. The first reinforcing layer forming portion that forms the cellulose nanofibers to be a layer in a film shape and the first that fixes the laminated cellulose nanofiber layers to the filter skeleton that is dried and pressed while the filter skeleton is running. Equipped with a dry fixing part,
As a series of processing means for obtaining the filter by providing the reinforcing layer on the other surface of the filter skeleton after the treatment at the first dry fixing portion, the other side opposite the reinforcing layer formed on the filter skeleton. A second reinforcing layer forming portion that forms the cellulose nanofibers to be the reinforcing layer in a film shape on the surface of the filter body, and the filter skeleton that dries and presses the laminated cellulose nanofiber layers while the filter skeleton is running. Further, the filter skeleton having the cellulose nanofiber layers formed on both sides after the treatment of the second dry fixing portion is wound up in a roll shape and re-used into the impurity treatment apparatus filter. The configuration is provided with a filter winding unit for obtaining the usable filter.

Further, the first reinforcing layer forming portion and the second reinforcing layer forming portion of the filter manufacturing apparatus according to the second aspect of the present invention are
A fiber laminating treatment tank that stores a reinforcing layer forming liquid in which cellulose nanofibers are dispersed in water at a required ratio, and a cylindrical net portion that is driven and rotated or rotatably provided in the fiber laminating treatment tank. The rotating drum having the structure, the arc-shaped cylindrical portion close to the inner peripheral surface of the cylindrical net portion, and the arc-shaped cylindrical portion provided in the rotating drum and supported by the tank body to close the periphery other than the arc-shaped cylindrical portion to hold the arc-shaped cylindrical portion. A suction box having a box main body, a suction box provided through the box main body and the tank main body, and a drainage port for discharging the liquid in the box main body to the outside of the tank, is provided from the rolled state. The filter skeleton to be fed is wound around the cylindrical mesh portion of the rotating drum to run, and the liquid in the suction box is discharged to the outside of the tank, so that the hydraulic pressure in the suction box is released to the reinforcing layer on the outer periphery of the rotating drum. The pressure is reduced to be lower than the hydraulic pressure of the forming liquid, and under the action of this reducing pressure, the water content of the reinforcing layer forming liquid on the outer periphery of the rotating drum is passed through the mesh holes of the filter frame and dispersed in the reinforcing layer forming liquid. The cellulose nanofibers to be used are not allowed to flow, but are laminated on the surface of the filter frame to form a cellulose nanofiber layer.

According to the present invention, it is possible to provide a filter manufacturing method and a filter manufacturing apparatus strengthened based on a filter paper or the like so that a number of times of reuse can be obtained significantly higher than that of a filter paper alone.

FIG. 1 is a block diagram showing an impurity removing device to which a filter manufactured by the device of the present invention is applied in a symbolic diagram and arranged in the order of processing steps. A filter manufactured by the apparatus of the present invention, FIG. 2A shows a perspective view of the filter, FIG. 2B shows a partially enlarged cross-sectional view of the filter skeleton, and FIG. 2C shows a filter skeleton. A partially enlarged cross-sectional view of a filter having a reinforcing layer fixed to one side of the filter is shown, and FIG. 2D shows a partially enlarged cross-sectional view of a filter having reinforcing layers fixed to both sides of the filter frame. FIG. 3 is a principle diagram of a filter manufacturing apparatus according to the first embodiment of the present invention, in which each component is represented by a symbolic diagram and arranged in the order of processing steps. FIG. 4 is a vertical sectional front view of the filter manufacturing apparatus according to the embodiment which is substantially the same as the filter manufacturing principle diagram shown in FIG. FIG. 5 is a principle diagram of a filter manufacturing apparatus according to a second embodiment of the present invention, in which each component is represented by a symbolic diagram and arranged in the order of processing steps. FIG. 6 is a vertical sectional front view of the filter manufacturing apparatus according to the embodiment which is substantially the same as the filter manufacturing principle diagram shown in FIG.

Hereinafter, the filter manufacturing method and the filter manufacturing apparatus according to the embodiment of the present invention will be described with reference to the drawings.

[Application example of the filter manufactured by the apparatus of the present invention]
FIG. 1 is a block diagram showing an impurity removing device to which a filter manufactured by the filter manufacturing device according to the embodiment of the present invention is applied in a symbolic diagram and arranged in the order of processing steps. The impurity removing device includes, for example, a filter supply unit 1, a filtration tank unit 2, a brushing unit 3, a mesh hole clogging eliminating unit 4, a water removing unit 5, and a filter winding unit 6.

Next, the impurity removing device will be described. The filter F1 (F2) according to the present embodiment shown in FIG. 2A, which will be described later, is wound in a roll shape, and is continuously fed out from a state supported by the filter supply unit 1 at a constant speed for filtration. It is guided to the tank portion 2 and is set in a state of blocking the flow of an aqueous liquid containing solid impurities (for example, a used coolant liquid of a grinding machine) and moves in the surface length direction. Then, in the filter F1 (F2), in the filtration tank portion 2, for the aqueous liquid, the pressure difference between the hydraulic pressure on the upstream side and the hydraulic pressure on the downstream side acting on the blocking surface of the filter (the hydraulic pressure on the upstream side is increased). (Or reduce the hydraulic pressure on the downstream side) to actively flow through the mesh holes, and keep solid impurities in close contact with each other by the pressure difference of the hydraulic pressure without passing through the mesh holes. Capture. Next, the filter F1 (F2) moves from the damming position to the brushing unit 3 and sweeps away the solid impurities captured by brushing. Subsequently, the filter F1 (F2) is moved to the mesh hole clogging clearing section 4, and fluid pressure is applied to the mesh hole from the surface opposite to the trapping surface to remove fine solid impurities that are clogged in the mesh hole. The clogging of the mesh hole is eliminated by separating it from the mesh hole / capturing surface. After that, the filter F1 (F2) can be used repeatedly by removing water by the water removing unit 5 and then winding it again in a roll shape by the filter winding unit 6.

In this way, the filter F1 (F2) is continuously fed out from the rolled state at a constant speed, and is stretched in a film shape so as to block the flow path of the liquid to be treated containing fine particle solid impurities. It is a filter that allows the liquid to be treated to flow through the mesh holes at the damming position in a state of being installed and continuously moving, and traps solid impurities in the liquid to be treated without flowing to the downstream side.

[Outlined configuration of a filter manufactured by the manufacturing method / apparatus of the present invention]
FIG. 2A shows a perspective view of the roll form of the filters F1 and F2 according to the first and second embodiments described later. FIG. 2B shows a partially enlarged cross-sectional view of a filter skeleton 11 (equivalent to a conventional filter paper) having mesh holes 11a constituting the filter, and FIG. 2C shows a reinforcing layer 12 on one side of the filter skeleton 11. 2 (D) shows a partially enlarged cross-sectional view of the filter F1 to which the reinforcing layer 12A is fixed, and FIG. 2D shows a filter having the reinforcing layer 12A fixed to one surface of the filter frame 11 and the reinforcing layer 12B fixed to the other surface. A partially enlarged cross-sectional view of F2 is shown. The filters F1 and F2 are filters that are repeatedly applied to the impurity removing device shown in FIG. 1, and are reinforced based on a filter paper or the like so that the number of times of reuse can be significantly higher than that of the filter paper alone.

[First Embodiment]
[First filter manufacturing device]
First, a schematic configuration of the filter manufacturing apparatus 20 according to the first embodiment of the present invention will be described with reference to FIG. FIG. 3 is a manufacturing principle diagram of the filter F1 in which each component is represented by a symbolic diagram and arranged in the order of processing steps. The filter manufacturing apparatus 20 includes a filter skeleton supply unit 21, a reinforcing layer forming unit 22, a drying fixing unit 23, and a filter winding unit 24, and is wound in a roll shape as shown in FIG. 2 (B). As shown in FIG. 2C, the reinforcing layer 12 is fixed to one side of the delivered filter skeleton 11, and the filter F1 wound in a roll shape shown in FIG. 2A can be manufactured.

In FIG. 3, the filter skeleton 11 wound in a roll shape around the filter skeleton supply portion 21 has a reinforcing layer (cellulose nanofiber layer) 12 on one side (lower surface) of the reinforcing layer forming portion 22 as a thin film layer having a required thickness. It is laminated by adsorption. Next, after the moisture is removed by the drying fixing portion 23, a roll pressure is applied, and the product is further dried by a heater roll or the like, and finally, it is wound into a roll shape by the filter winding portion 24, and thus on one side of the filter frame 11. A filter F1 in which the reinforcing layer 12 is laminated and fixed is manufactured.

Subsequently, a detailed configuration of the filter manufacturing apparatus 20 will be described with reference to FIG. FIG. 4 is a vertical sectional front view of the filter manufacturing apparatus 20 according to an embodiment substantially the same as the principle diagram of the filter manufacturing apparatus 20 shown in FIG. The filter manufacturing apparatus 20 shown in FIG. 4 includes an accumulator 25 between the drying fixing portion 23 and the filter winding portion 24.

The filter skeleton supply unit 21 is incorporated into the bracket 21a, the rotating shaft 21b which is cantileverably supported by the bracket 21a and can adjust a weak braking force, and the rotating shaft 21b. A chuck mechanism (not shown, not shown) that chucks the inner diameter surface with respect to the bobbin of the roll-shaped filter skeleton 11 fitted on the outer circumference, a filter skeleton feeding roll 21d that is driven and rotated at a constant speed by a motor 21e, and a filter. It is provided with a free-rotating nip roll 21c that rolls the skeleton feeding roll 21d. The roll-shaped filter skeleton 11 fitted on the rotating shaft 21b is wound around the nip roll 21c and the filter skeleton feeding roll 21d in this order, and is guided to the reinforcing layer forming portion 22. The filter skeleton 11 is any one of filter paper, filter cloth, non-woven fabric, or single-layer mesh film, and is made of a mesh web that is rolled into a roll.

The reinforcing layer forming portion 22 includes a fiber laminating processing tank 22a, a rotating drum 22b provided in the fiber laminating processing tank 22a, and a substantially fan-shaped suction box 22c provided in the rotating drum 22b, and is a filter. Required thickness on one surface of the skeleton 11 to enhance the burst strength of the filter skeleton 11 and to provide a flat surface holding property that prevents wrinkles from twisting, and to provide a stable capturing performance higher than the capturing performance of the mesh holes of the filter skeleton 11. The cellulose nanofiber layer 12 of the porous membrane is adsorbed and formed.

Fiber lamination treatment tank 22a includes a tank body 22a1, and a liquid introducing portion 22a2 formed one step lower in the central portion of the bottom portion of the tank body 22a1, and a liquid inlet 22a3 provided on the side surface portion of the liquid introducing portion 22a2 , The liquid drain port 22a4 provided in the center of the bottom conical portion of the liquid introduction portion 22a2, the liquid drain valve 22a5 provided in the liquid drain port 22a4, and the liquid level of the fiber layer forming liquid stored in the tank body 22a1. The liquid level high level sensor 22a6 and the liquid level low level sensor 22a7 for controlling the level are provided. By providing the liquid level high level sensor 22a6 and the liquid level low level sensor 22a7, the fiber layer forming liquid always controlled to a constant concentration is stored and managed in the fiber laminating processing tank 22a.

The rotary drum 22b includes a horizontal shaft 22b1 supported at both ends of the tank body 22a1, a motor 22b2 supported on the outer surface of the tank and connected to one end of the horizontal shaft 22b1 and the horizontal shaft 22b1 to rotate the horizontal shaft 22b1. It is provided with a cylindrical net portion 22b3. The cylindrical net unit 22b3 is pivotally supported at one end (vertically upper end in the drawing) in the tank of the horizontal shaft 22b1 and supported by a disk-shaped frame (not shown, unsigned) that closes one side of the cylindrical net unit 22b3. As a result, the disk-shaped frame can rotate while avoiding interference with the suction box 22c. The cylindrical net unit 22b3 is made of, for example, a stainless steel porous cylindrical body having a 10 mm square hole and a 1 mm wide linear joint.

The filter skeleton 11 guided from the filter skeleton supply unit 21 is wound around the cylindrical net unit 22b3 so as to cover the entire width. The horizontal shaft 22b1 is driven and rotated by the motor 22b2 so that the peripheral speed of the cylindrical net unit 22b3 matches the speed of the filter skeleton 11 sent by the filter skeleton feeding roll 21d. The motor 22b2 can be abolished, and the motor 21e can be configured to split the power to drive the horizontal shaft 22b1.

The suction box 22c includes an arc-shaped cylindrical portion 22c1, a box main body 22c2, and a liquid outlet 22c3. The arc-shaped cylindrical portion 22c1 has a length of, for example, 1/3 of the inner peripheral length of the cylindrical net portion 22b3 of the rotary drum 22b, and is close to the inner surface of the lower portion of the cylindrical net portion 22b3. Similar to the cylindrical net unit 22b3 of the rotary drum 22b, the arc-shaped cylindrical portion 22c1 is made of a stainless steel porous cylinder having, for example, a 10 mm square hole and a linear connecting portion having a width of 1 mm, and the cylindrical net of the rotary drum 22b. It is close to the inner peripheral surface of the unit 22b3. The box body 22c2 is supported by the tank body 22a1 and is in the form of a stainless steel box in which the periphery other than the arcuate cylindrical portion 22c1 is closed. The liquid outlet 22c3 is composed of a short pipe provided at an upper portion of the box body 22c2 away from the arcuate cylindrical portion 22c1, and penetrates the side surface portion of the tank body 22a1 to the outside of the tank.

The reinforcing layer forming portion 22 is provided in the middle of the liquid supply pipe 27 and the liquid supply pipe 27 having one end (lower end) hanging from the bottom portion in the liquid storage tank 26 and the other end communicating with the liquid introduction port 22a3. A liquid supply pump 28 is provided, and the reinforcing layer forming liquid stored in the liquid storage tank 26 flows into the tank body 22a1 along the inner peripheral surface of the liquid introduction portion 22a2, and the liquid level high level sensor 22a6 and the liquid The height level between the two sensors is controlled by the low surface level sensor 22a7. The reinforcing layer forming liquid is composed of an aqueous solution obtained by dissolving a predetermined ratio of cationic starch in water and cellulose nanofibers dispersed in the aqueous solution at a predetermined ratio. As the cellulose nanofibers, cellulose nanofibers having amphipathic properties are used.

The reinforcing layer forming portion 22 is provided in the middle of the suction pipe 30 having one end (lower end) hanging in the liquid receiving tank 29 and the other end (upper end) communicating with the liquid outlet 22c3 of the suction box 22c. The suction pump 31 is provided, and the suction pump 31 sucks the liquid in the suction box 22c and causes it to flow down into the liquid receiving tank 29.

Therefore, the filter skeleton 11 guided from the filter skeleton supply unit 21 is wound around the cylindrical net unit 22b3 so as to cover the entire width, thereby blocking the reinforcing layer forming liquid stored in the tank body 22a1. Since the liquid in the suction box 22c is sucked and discharged by the suction pump 31 and becomes a negative pressure, the reinforcing layer forming liquid dampened in this way flows into the suction box 22c through the mesh hole of the filter frame 11. The cellulose nanofibers formed and dispersed in the reinforcing layer forming liquid are captured on the surface of the filter frame 11 without passing through the mesh holes to form the cellulose nanofiber layer. In addition, a certain amount of cellulose nanofibers invade the filter skeleton 11, which increases the burst strength of the filter skeleton 11.

The filter skeleton 11 winds around the cylindrical net unit 22b3 of the rotating drum 22b and travels to form a cellulose nanofiber layer 12 and is guided to the dry fixing unit 23.

The drying fixing portion 23 includes a water absorbing roll 23b, an electric heater pair 23f, and a rolling compaction roll pair 23g, and guides the filter skeleton 11 on which the cellulose nanofiber layer 12 guided from the rotating drum 22b is formed to the guide roll 23a. , 23d ensures a large winding angle around the water absorption roll 23b, and then the guide roll pair 23e, the electric heater pair 23f, and the rolling compaction roll pair 23g are sequentially passed through and guided to the accumulator 25.

The water absorption roll 23b is a roll made of a porous material such as a sponge, and the roll shaft is hollow and made of a porous cylinder, both ends are pivotally supported in a rotation-free manner, one end is closed, and the other end is via a rotary joint. It is connected to the vacuum pipe 23c. The upper end of the vacuum pipe 23c is connected to a vacuum pump (not shown), and the water blocked by the draining plate provided at the bottom of the pipe at the rising portion of the pipe flows out from the downward water outlet.

The electric heater pair 23f passes through the filter skeleton 11 on which the cellulose nanofiber layer 12 is formed in a non-contact manner, and is heated by radiant heat (heat rays). The heating of the electric heater vs. 23f can be adjusted to the required temperature.

The rolling roll pair 23g is provided so that the spacing can be adjusted and the rolling rolling force can be adjusted, and a rolling pressure is applied to the filter skeleton 11 on which the cellulose nanofiber layer 12 is formed, whereby the cellulose nanofiber layer 12 is thickened. The cellulose nanofibers are pierced by the cellulose nanofibers facing the filter skeleton 11 in the cellulose nanofiber layer 12, and the cellulose nanofibers and the fibers of the filter skeleton 11 are entangled to form cellulose. The adhesion between the nanofiber layer 12 and the filter skeleton 11 is largely maintained.

As a modification of the guide roll pair 23e, the electric heater pair 23f, and the compaction roll pair 23g of the dry fixing portion 23, the dry fixing portion 23A shown in FIG. 4 can be provided. The dry fixing portion 23A is heated (heat transferred) by heater rolls 23h and 23i in which the filter skeleton 11 on which the cellulose nanofiber layer 12 is laminated can adjust the distance (gap) between the rollers. In this example, the filter skeleton 11 on which the cellulose nanofiber layer 12 is laminated is wound around the heater rolls 23h and 23i by the guide rolls 23k and 23m so as to increase the winding angle. On the downstream side of the heater roll 23i, a rolling roll pair 23j capable of adjusting the distance (gap) between the rollers between the guide rolls 23m and 23n is provided so as to be free-rotatable. By having a combination of rollers with different uses for these purposes, the cellulose nanofiber dispersion liquid is contained, excess water is removed from the swollen and deformed filter paper, and the surface of the filter paper is leveled and the thickness is made uniform. The reinforcing layer (cellulose nanofiber layer) can be stably fixed to the filter paper. In addition, as an example of partial deformation with respect to the dry fixing portion 23, a configuration in which hot air is blown may be used. Further, a heater roll pair may be provided between the electric heater pair 23f and the compaction roll pair 23g, and in this way, a modified example of the drying fixing portion 23A is included. The heating temperature of the electric heater pair 23f can be adjusted.

The accumulator 25 is provided with a filter skeleton traction roll 25b, a motor 25c that drives and rotates the filter skeleton traction roll 25b, and a filter F in which a cellulose nanofiber layer 12 is fixed and strengthened on one side of the filter skeleton 11 with respect to the filter skeleton traction roll 25b. It includes guide rolls 25a and 25d that hold a large winding angle, a step roll 25e, and a guide roll 25f. The motor 25c can be abolished, and the motor 21e can be configured to split the power and drive and rotate the filter skeleton traction roll 25b.

The filter winding unit 24 includes a bracket 24a, a winding rotating shaft 24b that is cantilevered and supported by the bracket 24a, a motor 24c that drives and rotates the winding rotating shaft 24b, and a winding rotating shaft. It is provided with a chuck mechanism (not shown, not marked) that chucks the inner diameter surface with respect to the bobbin of the filter F1 that is incorporated in the 24b and is fitted on the outer periphery of the winding rotary shaft 24b, and the guide roll 24d. The control widely used in packaging technology is applied to the drive of the motor 24c, the step roll 25e, and the raising and lowering.

Subsequently, the operation of the filter manufacturing apparatus 20 shown in FIG. 4 will be described. The filter manufacturing method according to the first embodiment will be described through the explanation of this action.

[Start of operation]
First, the filter skeleton 11 which is a roll form wound around the bobbin is attached to the rotating shaft 21b of the filter skeleton supply unit 21, wound around the lower outer peripheral surface of the cylindrical net unit 22b3 and the water absorption roll 23b in this order, passed through the electric heater pair 23f, and passed through the accumulator. The tip portion is fixed to the bobbin attached to the take-up shaft 24b of the filter take-up portion 24 by hanging on 25. After that, the liquid supply pump 28 is operated to supply the reinforcing layer forming liquid into the reinforcing layer forming portion 22 so that the liquid level becomes a predetermined height. As a result, the reinforcing layer forming liquid fills the suction box 22c through a slight gap between the cylindrical net unit 22b3 of the rotary drum 22b and the arcuate cylindrical portion 22c1 of the suction box 22c (initial filling).

Next, the suction pump 31 is operated, and after a lapse of several seconds to a dozen seconds, for example, the motors 21e, 22b2, 25c, 24c are driven, and vacuum is started from the suction pipe 30 and the vacuum pipe 23c.

[Action of Reinforcing Layer Forming Part 22]
When the suction pump 31 provided in the suction pipe 30 communicated with the liquid outlet 22c3 of the suction box 22c is operated, the reinforcing layer forming liquid in the suction box 22c is sucked and the liquid pressure in the suction box 22c becomes negative pressure. Then, the reinforcing layer forming liquid in the tank body 22a1 starts to flow toward the suction box 22c. After a few seconds to a dozen seconds have passed, the rotary drum 22b is driven and rotated, and the filter skeleton 11 wound around the rotary drum 22b starts running.

The reinforcing layer forming liquid in the tank body 22a1 starts to flow toward the suction box 22c in the region corresponding to the arcuate cylindrical portion 22c1 of the suction box 22c. In the flow of the reinforcing layer forming liquid, water passes through the mesh holes of the filter frame 11. The cellulose nanofibers in the reinforcing layer forming liquid cannot pass through the mesh holes of the filter skeleton 11, and are attracted to and laminated on the surface of the filter skeleton 11 by the negative pressure suction force. In the process of laminating cellulose nanofibers, a part of the cellulose nanofibers invades the filter skeleton 11 and is involved in increasing the burst strength of the filter skeleton 11, and another part of the cellulose nanofibers is involved in increasing the burst strength of the filter skeleton 11. The rest (mostly) of the cellulose nanofibers pierced toward the surface of 11 and oriented in various three-dimensional directions is entangled with the pierced cellulose nanofibers and the fibers extending from the surface of the filter skeleton 11. It will be. As a result, the filter skeleton 11 and the cellulose nanofiber layer formed on the surface of the filter skeleton 11 generate a fixing force. Since the reinforcing layer forming liquid contains the cationic starch, the cellulose nanofiber layer 12 contains the cationic starch, and the cellulose nanofiber layer 12 is hardened to the filter skeleton 11 due to the cationic starch. The adhesive force will be further increased, and the strength of the network structure of the cellulose nanofiber layer 12 will be increased. Cationic starch has a paper strength enhancing effect (paper strength enhancing agent) as an internal paper strength and surface paper quality improving agent for the composite structure of the filter frame and the reinforcing layer of the cellulose nanofiber fibers. ..

[Action of dry fixing part 23]
As described above, the cellulose nanofiber layer 12 is laminated on the reinforcing layer forming portion 22, and the filter skeleton 11 contains a large amount of water and swells thickly. By vacuuming from the vacuum pipe 23c, the inside of the filter skeleton 11 is inside the roll surface. Water is absorbed from the surface of the filter skeleton 11 opposite to the laminated surface of the cellulose nanofiber layer 12 in the process of winding around and passing through the water absorbing roll 23b that absorbs water toward the surface. As a result, the cellulose nanofiber layer 12 adheres more strongly to the surface of the filter skeleton 11, and the next electric heater pair 23f can effectively perform heating and drying.

The electric heater pair 23f is radiated and heated in the process in which the filter skeleton 11 on which the cellulose nanofiber layer 12 is laminated after the water absorption is performed by the water absorption roll 23b moves horizontally from the guide roll pair 23g to the compaction roll pair 23j. Remove the remaining water. The compaction roll pair 23j is compacted and flattened with respect to the filter skeleton 11 on which the cellulose nanofiber layer 12 from which water has been removed is laminated. As a result, the roll pressure acts to further pierce the cellulose nanofibers pierced into the filter skeleton 11 in the reinforcing layer forming portion 22, so that the filter skeleton 11 and the cellulose nanofiber layer 12 further increase the adhesive force. ..

The filter skeleton 11 on which the cellulose nanowave layer 12 that has passed through the rolling roll pair 23g (or 23j) is laminated is completed as the filter F1 and is wound around the winding shaft 24b of the filter winding portion 24 via the accumulator 25.

[Filter replenishment processing]
The pumps 28 and 31 and the motors 21e, 22b2, 25c and 24c are put into operation shortly before the end of the roll-shaped filter skeleton 11 set in the filter skeleton supply unit 21 is separated from the bobbin due to the promotion of filter manufacturing. Stop. Then, remove the bobbin from the rotating shaft 21b, to connect the next roll of filter skeleton 11 Se Tsu Sorted feeding end to the filter skeleton supply unit 21 at the winding end and the adhesive tape of the filter skeleton 11. Then, the pumps 28 and 31 and the motors 21e, 22b2, 25c and 24c are operated again. When the replenishment position with the adhesive tape reaches the filter winding portion 24, the operations of the pumps 28 and 31 and the motors 21e, 22b2, 25c and 24c are stopped again. Then, the replenishment is released, the roll-shaped filter F1 is removed from the filter winding portion 24, a new bobbin is attached to the winding rotating shaft 24b, and the tip of the filter F1 after the replenishment is released is fixed to this bobbin. After winding a plurality of times, the pumps 28 and 31 and the motors 21e, 22b2, 25c and 24c are operated again. This completes the filter replenishment process. By performing such a filter replenishment process, a new roll-shaped filter skeleton 11 set in the filter skeleton supply section 21 can be unwound to automatically perform a winding operation up to the filter winding section 24, and the filter can be wound. It is possible to avoid temporarily draining the entire amount of the reinforcing layer forming liquid in the winding operation tank main body 22a1 for the replenishment process.

[Modified example of the first embodiment]
As one modification for changing the thickness of the reinforcing layer, two liquid storage tanks 26 are provided, and reinforcing layer forming liquids having different dispersion concentrations of cellulose nanofibers are stored in each of the two tanks. That is, the liquid storage tank 26 may be provided with a low-concentration liquid storage tank and a high-concentration liquid storage tank corresponding to the reinforcing layer forming portion so that the liquid can be supplied in a switchable manner. Then, when forming a reinforcing layer formation having a small layer thickness on the filter skeleton, a liquid storage tank 26 for storing the reinforcing layer forming liquid having a low dispersion concentration of cellulose nanofibers is selected, and a layer is formed on the filter skeleton. When forming a reinforcing layer forming having a large thickness, a liquid storage tank 26 for storing a reinforcing layer forming liquid having a high dispersion concentration of cellulose nanofibers is selected, and the reinforcing layer forming liquid in the selected tank is used. It may be supplied into the fiber laminating processing tank 22a.

As another modification for changing the thickness of the reinforcing layer, the traveling speed of the filter skeleton 11 that winds around the cylindrical net unit 22b3 of the rotating drum 22b and travels may be changed.

As a method of providing the rotating drum 22b, the driving rotation is not performed by the motor 22, but the rotating drum 22b is provided so as to be rotatable, even if it is pulled and rotated by the winding force of the filter skeleton 11 that wraps around the cylindrical net unit 22b3 and travels. Good.

As a method of providing the rotary drum 22b, instead of the configuration supported by the horizontal shaft 22b1 provided at the center of the rotary drum 22b, a guide for engaging and guiding both outer peripheral edges of the cylindrical net unit 22b3 is provided on the inner surface of the tank body 22a1. You may do so.

The dry fixing portion 23 and the dry fixing portion 23A may be combined into one. Specifically, the water absorption roll 23b, the electric heater pair 23f, the guide roll pair 23e, the heater rolls 23h and 23i, the rolling compaction roll pair 23g, and the rolling compaction roll in order from the upstream side in the traveling direction of the filter frame 11. It may be configured to provide a pair of 23j.

Other configurations for traveling the filter skeleton 11 include a filter skeleton feeding motor provided on the rotating shaft 21b of the filter skeleton supply unit 21 and a filter winding motor 24c provided on the winding rotating shaft 24b of the filter winding unit 24. Only two motors are provided, and the traveling speed of the filter skeleton 11 that winds around the cylindrical net portion 22b3 of the rotating drum 22b and travels is detected, and the tension acting on the filter skeleton 11 during traveling is constantly detected and traveled. The two motors are controlled by software so that the speed and tension are constant.

The filter skeleton traction roll 25b, the motor 25c, and the accumulator 25 are not provided, and a servomotor is used for the filter winding motor 24c, so that the film winding speed (running speed) of the filter F1 becomes a predetermined speed. The winding diameter may be constantly measured and the motor may be rotationally driven so as to gradually reduce the motor rotation speed.

As another configuration for traveling the filter skeleton 11, the accumulator 25 is provided in front of the filter winding motor 24c in FIG. 4, but the filter skeleton 11 is also provided between the filter skeleton feeding roll 21d and the rotating drum 22b. It is possible to provide an accumulator that absorbs the running length of the drum and secures the tension. That is, by providing the accumulator, the motor 25c can be rotated at a constant speed so as to have a required rotation speed, and the traction travel of the filter skeleton 11 by the filter skeleton traction roll 25b can be made constant speed, and the step roll constituting the accumulator can be rotated. The tension acting on the filter skeleton 11 can be made constant by the weight, and the rotation speed of the motor 21e for feeding the filter skeleton is increased when the step roll rises to a high threshold level. It can be driven to decelerate and rotate when the step roll drops to a low threshold level.

[Second Embodiment]
[Second filter manufacturing equipment]
FIG. 5 is a schematic manufacturing principle diagram of the filter F2 according to the filter manufacturing apparatus 40 of the second embodiment of the present invention, in which each component is represented by a symbolic diagram and arranged in the order of processing steps. The filter manufacturing apparatus 40 includes a filter skeleton supply section 41, a first reinforcing layer forming section 42, a first drying fixing section 43, a second reinforcing layer forming section 44, a second drying fixing section 45, and a filter winding. As shown in FIG. 2 (D), the reinforcing layers 12A and 12B are fixed to one side of the filter skeleton 11 which is provided with the portion 46 and is unwound from the rolled state shown in FIG. The filter F2 wound in a roll shape shown in A) can be manufactured.

In FIG. 5, in the filter skeleton 11 wound in a roll shape around the filter skeleton supply portion 41, the cellulose nanofiber layer 12A is formed on one surface (lower surface) of the first reinforcing layer forming portion 42 by the cellulose nanofiber layer forming liquid. It is adsorbed as a thin film layer having a required thickness, then water is removed by the first drying fixing portion 43, a roll pressure is applied, and the mixture is further dried by a heater roll or the like.

Subsequently, in the second reinforcing layer forming portion 44, the cellulose nanofiber layer 12B is adsorbed on the other surface (lower surface) as a thin film layer having a required thickness by the cellulose nanofiber layer forming liquid, and then in the second drying fixing portion 45. After the water is removed, roll pressure is applied and the product is further dried by a heater roll or the like. Finally, it is wound into a roll shape by the filter winding unit 46, and the reinforcing layers 12A and 12B are laminated on both sides of the filter frame 11. The fixed filter F2 is manufactured.

Also in the apparatus shown in FIG. 6, although not shown, the reinforcing layer forming liquid is formed on the tank body 42a of the first reinforcing layer forming portion 42 so as to correspond to the liquid storage tank 26 and the liquid receiving tank 29 shown in FIG. The first liquid storage tank for supplying the reinforcing layer and the second liquid storage tank for supplying the reinforcing layer forming liquid to the tank body 44a of the second reinforcing layer forming portion 44, and the suction box of the first reinforcing layer forming portion 42. It is provided with a first liquid receiving tank that receives the treated liquid discharged from 42c and a second liquid receiving tank that receives the treated liquid discharged from the suction box 44c of the second reinforcing layer forming portion 44.

Further, there are two first liquid storage tanks and two second liquid storage tanks for storing the reinforcing layer forming liquid, and the reinforcing layer forming liquid having a high dispersion concentration of cellulose nanofibers and the reinforcing layer forming liquid having a low dispersion concentration. As a result, it is possible to switch between the reinforcing layer forming liquids having different dispersion concentrations of the cellulose nanofibers in the first liquid storage tank and the second liquid storage tank. Therefore, the thickness of the reinforcing layer formed in each of the first reinforcing layer forming portion 42 and the second reinforcing layer forming portion 44 can be changed, and the thicknesses of the reinforcing layers 12A and 12B are made the same on both sides of the filter frame 11. Or can be different.

Subsequently, the configuration and operation of the filter manufacturing apparatus 40 will be described with reference to FIG. FIG. 6 is a vertical sectional front view of the filter manufacturing apparatus 40 according to an embodiment substantially the same as the principle diagram of the filter manufacturing apparatus 20 shown in FIG.

As shown in FIG. 6, in the filter manufacturing apparatus 40, the filter skeleton supply portion 41, the first reinforcing layer forming portion 42, and the first drying fixing portion 43 are arranged in the upper stage, and the second reinforcing layer forming portion 44 and the filter manufacturing apparatus 40 are arranged. , The second dry fixing portion 45 and the filter winding portion 46 are arranged in the lower stage.

In this embodiment, the cellulose nanofiber layer 12A, which is a reinforcing layer, is formed on the filter skeleton 11 in the process in which the filter skeleton 11 unwound from the filter skeleton supply portion 41 travels on the first reinforcing layer forming portion 42. Then, the filter skeleton 11 on which the cellulose nanofiber layer 12A is formed is guided from the first dry fixing portion 43 to the second reinforcing layer forming portion 44 by the first filter transition portion 50. The first filter transition unit 50 includes a towing drive roll 50a, a motor 50b for driving the towing drive roll 50a, a nip roll 50c provided so as to be freely rotatable and in contact with the towing drive roll 50a, and guide rolls 50d and 50e. , 50f, and is guided from the guide roll 50f to the rotating drum 44b of the second reinforcing layer forming portion 44.

Further, in this embodiment, when the cellulose nanofiber layer 12A, which is a reinforcing layer formed on the filter skeleton 11, passes through the second reinforcing layer forming portion 44 in a state of being in close contact with the rotating drum 44b of the second reinforcing layer forming portion 44. A cellulose nanofiber layer 12B, which is a reinforcing layer, is formed on the filter frame 11. Then, the filter F2 having the cellulose nanofiber layer 12A formed on one surface of the filter skeleton 11 and then the cellulose nanofiber layer 12B formed on the other surface removes water, heats and fixes, and pressurizes in the second dry fixing portion 45. After being flattened, it is guided to the filter winding section 46 by the second filter transition section 60. The second filter transition unit 60 includes a guide roll 60a for increasing the winding angle, and guide rolls 60b and 60c for holding the filter F2 around the guide roll 60a at a large winding angle. In this embodiment, there is no accumulator, and a torque motor is used as a motor for rotationally driving the winding rotary shaft of the filter winding unit 46.

The filter skeleton supply section 41 and the filter winding section 46 shown in FIG. 6 are substantially the same as the filter skeleton supply section 21 and the filter winding section 24 shown in FIG. 4, respectively, and the first reinforcing layer forming section 42 shown in FIG. And the second reinforcing layer forming portion 44 are substantially the same as the reinforcing layer forming portion 22 shown in FIG. The first dry fixing portion 43 shown in FIG. 6 has a rotary drum 42b in the fiber laminating processing tank 42a, and further has a suction box 42c in the rotary drum 42b, and the second dry fixing portion 45 has a fiber laminating portion 45. The processing tank 44a has a rotary drum 44b, and the rotary drum 44b has a suction box 44c. This configuration has a dry fixing portion 23 shown in FIG. 4 and a rotary drum 22b in the tank body 22a1 to further rotate. It is substantially the same as the configuration having the suction box 22c in the drum 22b.

The first reinforcing layer forming portion 42 imparts an increase in the burst strength of the filter skeleton 11 and a flat surface retention property that prevents wrinkles from twisting on one surface of the filter skeleton 11, and also has a higher level than the ability to capture the mesh holes of the filter skeleton 11. A cellulose nanofiber layer 12A of a porous film having a required thickness that imparts high and stable capture performance is adsorbed and formed.

The second reinforcing layer forming portion 44 imparts the other surface of the filter skeleton 11 to the enhancement of the burst strength of the filter skeleton 11 and the flatness holding property at which wrinkles are less likely to be twisted, and is more than the ability to capture the mesh holes of the filter skeleton 11. The cellulose nanofiber layer 12B of a porous film having a required thickness that imparts high and stable capture performance is adsorbed and formed.

Further detailed description of the configuration and operation of the filter manufacturing apparatus 40 will be omitted.

[Characteristics of filter F1 and filter F2 manufactured by the manufacturing method / apparatus of the present invention]
The filter F1 shown in FIGS. 2 (A) and 2 (C) is manufactured by the filter manufacturing apparatus 20 shown in FIGS. 3 and 4, and the filter F2 shown in FIGS. 2 (A) and 2 (D) is manufactured by the filter manufacturing apparatus 20 shown in FIGS. It is manufactured by the filter manufacturing apparatus 40 shown in FIG. 6 and has the following common features.

The filter skeleton 11 is any one of filter paper, filter cloth, non-woven fabric, or single-layer mesh film, and is made of a mesh web that is rolled into a roll. The cellulose nanofiber layers 12, 12A and 12B, which are the reinforcing layers, are cellulose nanofiber layers fixed to one or both surfaces of the filter skeleton 11, and are provided in a thin film having a required thickness in a network structure to form the filter skeleton. The size of the mesh holes of 11 is larger than the diameter at which the desired capture performance can be obtained, so that the network structure of the cellulose nanofiber layer covers the mesh holes and the desired capture performance can be obtained according to the thickness of the network structure. It has become.

In the cellulose nanofiber layers 12, 12A and 12B, some cellulose nanofibers invade the filter skeleton 11, some other cellulose nanofibers pierce the filter skeleton 11, and most of the rest are intricately entangled with each other. The burst strength of 11 is reinforced, and a stable capturing performance higher than the capturing performance of the mesh holes of the filter frame 11 is imparted.

Then, the cationic starch invades the filter skeleton 11 to increase the strength of the filter skeleton 11, intervenes as a fixing agent between the filter skeleton 11 and the cellulose nanofibers, and the cellulose nanofibers are networked with each other. It intervenes as a binder so as to form a layered structure, thereby imparting flatness retention that prevents wrinkles from twisting.

Further, since the cellulose nanofibers are needle-shaped, the cellulose nanofibers facing the direction of the filter skeleton 11 are pierced and locked into the filter skeleton 11 by receiving a pressing force, and the cellulose nanofiber fibers are further filtered. The fibers are entangled with each other between the fibers of the skeleton 11, so that the cellulose nanofiber layers (reinforcing layers 12, 12A, 12B) are strongly bonded to the filter skeleton 11.

The cellulose nanofiber layer (reinforcing layer 12, 12A, 12B) is preferably an amphipathic medium in which the surface to be fixed to the filter body is compatible and the surface opposite to the surface to be fixed to the filter body is water repellent. If it has sex, the outflow can be suppressed to a small extent.

In the filters F1 and F2, the cellulose nanofiber layers 12, 12A and 12B, which are reinforcing layers on one or both surfaces of the filter frame 11, are fixed (impregnation and piercing of the cellulose nanofiber, entanglement between fibers, and cationic starch. The required thickness increases the burst strength of the filter skeleton 11 and imparts flatness retention that prevents wrinkles from twisting, and also imparts stable capture performance that is higher than the capture performance of the mesh holes of the filter skeleton. Adsorbs and forms a cellulose nanofiber layer of a porous membrane. The filters F1 and F2 can obtain an allowable number of times of repeated use that greatly exceeds the allowable number of times of repeated use when used only with the conventional filter paper.

As the filter skeleton 11, a mesh web is prepared in which the form before the reinforcing layers 12, 12A and 12B are laminated is wound in a roll shape. Specifically, as the filter skeleton 11, any one of filter paper, filter cloth, non-woven fabric, and single-layer mesh film can be used. As for the filter skeleton 11, there are several types of filter skeletons 11 having different fineness, for example, quantitative filter papers and quantitative filter cloths having φ1, 2, 4, 6, 8, 10 μm, etc., which are commercially available. Therefore, an appropriate one can be selected according to the purpose such as the size of the object to be filtered and the amount of filtration per unit time.

As the filter paper, cotton fiber (cellulose) can be generally used, or a biologically inert mixture of cellulose acetate and cellulose nitrate, a glass fiber filter paper, and a hydrophilic PTFE membrane. A treated product or a quartz filter paper using high-purity fine silica fiber can be used.

The filter cloth is a yarn made from any of polyethylene terephthalate, polypropylene, polyamide, polyester, acrylic, heat-resistant nylon, polyimide, PPS, glass, PTFE, and glass PTFE, and is spun yarn (short fiber yarn) and multifilament. Any yarn of (long fiber yarn) or monofilament (long single fiber yarn) may be processed as a plain weave, a twill weave, a red weave, a double weave, or a needle punching felt to form a mesh filter.

The non-woven fabric may be a mesh filter made of spun yarn (short fiber yarn) made of any one of polyethylene, polypropylene, polyamide, polyester and the like by non-woven processing.

The single-layer mesh film is a biaxially stretched film such as polyethylene, polypropylene, polyamide, polyester, etc., which is provided on the entire surface in a distributed state in which pinholes are close to each other by needle punching or laser processing.

The reinforcing layer 12 has a thickness of 1 to 100 nm, an unspecified length, various orientations, and intricately entangled cellulose nanofibers dispersed in water on one or both surfaces of the filter frame 11. For example, it is laminated by a roll coater, and flattened by removing water with a water absorbing roll or the like and being pressurized. At that time, the cellulose nanofibers pierce the filter skeleton 11 and firmly adhere to the filter skeleton 11, so that the filter skeleton 11 is curved. Even if it is brushed, adhesion strength that does not easily peel off can be obtained.

In the filter manufacturing apparatus shown in FIG. 4, the cellulose nanofibers are impregnated into the filter frame and the cellulose nanofiber layer is formed so as not to use cationic starch as the cellulose nanofiber layer forming liquid stored in the fiber laminating processing tank 22a. Then, only water is stored in the fiber laminating treatment tank 22a, and the suction box 22c is made a negative pressure to allow water to flow through the filter, whereby the thickness of the cellulose nanofiber layer is not changed. Cellulose nanofibers impregnated in the filter skeleton of the above can be transferred to the deeper inside of the filter skeleton.

[Adhesion force of reinforcing layers 12, 12A, 12B]
The fact that the cellulose nanofibers invade the filter skeleton 11 and pierce it by the roll pressure is based on the fact that the cellulose nanofibers are needle-shaped bodies having a strength of about 5 times that of iron. In FIG. 4, the cellulose nanofibers invade the filter skeleton 11 together with the cationic starch under reduced pressure, and the invasion content and the invasion depth are large.

When the filter skeleton 11 is laminated as the cellulose nanofiber layer 12 in the process of moving in close contact with the lower side of the cylindrical net surface of the rotary drum 22b, the suction box 22c becomes a negative pressure, so that the rotary drum 22b The cellulose nanofiber layer forming liquid on the outside of the is sucked into the suction box 22c, and a large number of cellulose nanofibers are oriented in the direction of the filter skeleton 11, and these cellulose nanofibers invade the filter skeleton 11 by negative pressure suction force. Also, since it is adsorbed, the strength of the filter skeleton 11 is increased, and the cellulose nanofibers oriented toward the filter skeleton 11 pierce and lock diagonally and deeply into the hole wall of the mesh hole of the filter skeleton 11. , Cellulose nanofibers oriented substantially perpendicular to the surface portion of the filter frame 11 other than the mesh holes are deeply pierced and locked, and further, these pierced cellulose nanofibers are rolled for flattening after application. The fibers are pierced deeper by pressure and locked, and the fibers of the cellulose nanofibers are entangled with each other between the fibers of the filter frame.

Regarding the amount of cellulose nanofibers piercing the filter skeleton 11, in FIG. 3, the number of cellulose nanofibers oriented toward the filter skeleton 11 increases due to the decompression action, so the number of cellulose nanofibers piercing the filter skeleton 11 increases, and the adhesion force increases. Will increase.

Therefore, the cationic starch strengthens the entanglement between the cellulose nanofibers, the cationic starch impregnates the filter paper to increase the strength, and the cationic starch impregnating the filter paper strongly entangles the cellulose nanofibers with each other. Since the cationic starch is integrally connected to the cellulose nanofibers, the filter paper and the cellulose nanofibers have an adhesive force. In particular, in FIG. 4, the suction box 22c becomes a negative pressure, so that the cellulose on the outside of the rotating drum 22b is formed. Since the nanofiber layer forming liquid is sucked into the suction box 22c, the cellulose nanofibers in the cellulose nanofiber layer forming liquid are attracted by the suction force due to the negative pressure of the suction box 22c. The number of the cellulose nanofiber layers 12 is strongly oriented with respect to the filter skeleton 11 and the cellulose nanofiber layer 12 is strongly locked to the filter skeleton 11.

Further, the cationic starch further enhances the adhesive force of the cellulose nanofiber layer 12 to the filter frame 11, and also increases the strength of the network structure of the cellulose nanofiber layer 12. Cationic starch has a paper strength enhancing effect (paper strength enhancing agent) as an internal paper strength and surface paper quality improving agent for the composite structure of the filter frame and the reinforcing layer of the cellulose nanofiber fibers. .. Then, since the cationic starch increases the strength of the network structure, the cellulose nanofiber layer 12 is suppressed from wrinkling and the flatness is reinforced, and a filter is applied to the impurity removing device shown in FIG. Even if the number of times of repeated use is increased, the filter can move smoothly without meandering, and there is no risk of a large tension causing the filter to burst.

The reinforcing layer 12 is dried, so that the reinforcing layer 12 is a thin film having a required thickness and has a network structure, and becomes a cellulose nanofiber layer laminated on the filter frame 11 with a strong adhesion strength. The reinforcing layer 12 covers the mesh holes of the filter frame 11, and can stably realize finer meshes than the size of the mesh holes for a long period of time. The above matters are the same in FIG.

The filter F1 (F2) in which the reinforcing layers 12 (12A, 12B) are fixed to one side or both sides of the filter skeleton 11 is wound in a roll shape as a final form. This is because it is attached to the impurity removing device for reuse.

The filter F1 (F2) is provided in a network structure in the form of a thin film having a required thickness with respect to the filter frame 11, and the cellulose nanofiber layers 12 (12A, 12B) significantly increase the burst strength and maintain the network structure for a long period of time. Therefore, the stable capturing performance higher than the capturing performance of the mesh holes of the filter frame 11 is maintained for a long time.

In the filter F, the size of the mesh hole of the filter frame 11 is larger than the diameter at which the desired capture performance can be obtained, the network structure of the cellulose nanofiber layer covers the mesh hole, and the desired capture is performed according to the thickness of the network structure. Performance is being obtained.

According to the filter F (F2) according to the present embodiment, the filter F (F2) is set in a state of being unwound from a roll and blocking the flow of an aqueous liquid containing solid impurities, and captures solid impurities while moving in the plane direction. It is a filter that can be reused repeatedly by removing solid impurities and eliminating clogging of mesh holes. The cellulose nanofiber layers 12 (12A, 12B) have a network structure and high decay strength, and the filter can be reused. Stable capturing performance that greatly exceeds the capturing performance of only the mesh holes of the skeleton 11 can be obtained, and the allowable number of repeated uses that greatly exceeds the allowable number of repeated uses when used only with the conventional filter skeleton can be obtained, and the reinforcement can be obtained. By adjusting the cnf concentration of the layer-forming liquid, the traveling speed of the filter frame, and the depressurization in the suction box, the thickness of the cellulose nanofiber layer (thickness of the network structure) can be controlled, and thus the capture performance can be controlled. Furthermore, since the filter skeletons having different shrinkage rates and the cellulose nanofiber layers are bonded by cationic starch which is an adhesive having cushioning properties, wrinkles are suppressed from being generated in the filter skeleton 11. , The tensile strength can be shared to reinforce the flatness, and it can be used with a number of repeated uses that is considerably larger than the allowable number of repeated uses when used only with the conventional filter frame, even if the number of repeated uses increases. Partial peeling does not occur, and partial mesh hole capture performance does not deteriorate. In particular, the trapping performance of solid impurities can be controlled, and stable trapping performance that is significantly higher than when only filter paper is used can be obtained, and the number of repeated uses is significantly higher than when only filter paper is used. ..

According to the present invention, it is possible to provide a filter manufacturing method and a filter manufacturing apparatus strengthened based on a filter paper or the like so that a number of times of reuse can be obtained significantly higher than that of a filter paper alone. More specifically, by laminating a reinforcing layer based on filter paper or the like, the strength of the filter as a whole is increased, the strength is less deteriorated, the flatness is maintained without wrinkles, and the mesh holes are enlarged. It is possible to provide a method and an apparatus for manufacturing a filter which is difficult to deteriorate in filtration performance and can be reused much more frequently than a filter paper alone.

[Additional Notes]
The present application includes the inventions listed below in the above-described embodiments.
The present invention is a filter in which a filter skeleton having mesh holes and a cellulose nanofiber layer, which is a reinforcing layer laminated on one side of the filter skeleton, are wound in a roll shape. In a state where the liquid to be treated is unwound from the rolled state and continuously moves by blocking the flow path of the liquid to be treated containing fine particle-like solid impurities, the liquid to be treated is passed through the mesh holes to pass the solid. Impurities relate to filters that are trapped on the surface of the filter without passing through.

[First invention]
The filter manufacturing method according to the first invention is
As a series of processing steps for obtaining the filter by providing the reinforcing layer on one surface of the filter skeleton and winding the filter skeleton in a roll shape.
A step of forming a reinforcing layer in which the cellulose nanofibers to be the reinforcing layer are formed into a film on one side of the filter frame, and a step of forming the reinforcing layer.
A drying fixing step of drying and pressing the laminated cellulose nanofiber layer while the filter skeleton is running, and a drying fixing step of fixing the laminated cellulose nanofiber layer to the filter skeleton.
The configuration includes a filter winding step of winding the filter skeleton having the cellulose nanofiber layer formed on one surface in the drying fixing step in a roll shape to obtain the filter that can be reused as an impurity treatment apparatus filter.

Further, the reinforcing layer forming step is performed.
The filter skeleton that is unwound from the rolled state is guided into a fiber laminating treatment tank that stores a reinforcing layer forming liquid in which cellulose nanofibers are dispersed in a required ratio in water, and the fiber laminating treatment is performed. The liquid in the suction box provided in the rotary drum is discharged to the outside of the tank by winding around the cylindrical mesh portion of the rotary drum having the cylindrical mesh portion provided to be driven and rotated in the tank or rotatably provided. As a result, the hydraulic pressure in the suction box is reduced to be lower than the hydraulic pressure of the reinforcing layer forming liquid on the outer periphery of the rotating drum, and the moisture content of the reinforcing layer forming liquid on the outer periphery of the rotating drum is reduced under the action of this reduced pressure. Is not passed through the cellulose nanofibers which are allowed to flow through the mesh holes of the filter skeleton and are dispersed in the reinforcing layer forming liquid, and are laminated on the surface of the filter skeleton to form a cellulose nanofiber layer. It is a configuration.

[Second invention]
The filter manufacturing method according to the second invention is
As a series of processing steps of extending the filter skeleton from a rolled state and providing the reinforcing layer on one surface of the filter skeleton.
A first reinforcing layer forming step of forming the cellulose nanofibers to be the reinforcing layer in a film shape on one surface of the filter frame, and
The process includes a first drying fixing step of drying and pressing the laminated cellulose nanofiber layer while the filter skeleton is running, and fixing the laminated cellulose nanofiber layer to the filter skeleton.
As a series of treatment steps for obtaining the filter by providing the reinforcing layer on the other surface of the filter skeleton after the treatment in the first drying and fixing step.
A second reinforcing layer forming step of forming the cellulose nanofibers to be the reinforcing layer in a film shape on the other surface on the opposite side of the reinforcing layer formed on the filter skeleton.
The present invention includes a second drying fixing step of drying and pressing the laminated cellulose nanofiber layer while the filter skeleton is running, and fixing the laminated cellulose nanofiber layer to the filter skeleton.
Further, after the treatment of the second drying and fixing step is completed, the filter skeleton having the cellulose nanofiber layers formed on both surfaces of the filter skeleton is wound into a roll to obtain the filter that can be reused as an impurity treatment apparatus filter. The configuration includes a winding process.

Then, the first reinforcing layer forming step and the second reinforcing layer forming step are performed.
The filter skeleton is guided into a fiber laminating treatment tank that stores a reinforcing layer forming liquid in which cellulose nanofibers are dispersed in water at a required ratio, and is driven to rotate or rotate in the fiber laminating processing tank. The hydraulic pressure in the suction box is released by winding the liquid in the suction box provided in the rotary drum and discharging the liquid in the suction box provided in the rotary drum to the outside of the tank. The pressure is reduced so as to be lower than the hydraulic pressure of the reinforcing layer forming liquid on the outer periphery of the rotating drum, and under the action of this reduced pressure, the water content of the reinforcing layer forming liquid on the outer periphery of the rotating drum is allowed to flow through the mesh holes of the filter frame. In addition, the cellulose nanofibers dispersed in the reinforcing layer forming liquid are not allowed to flow, but are laminated on the surface of the filter frame to form a cellulose nanofiber layer.

[Third invention]
In the filter manufacturing method according to the first or second invention, the first reinforcing layer forming step and the second reinforcing layer forming step are
A part of the cellulose nanofibers dispersed in the reinforcing layer forming liquid on the outer periphery of the rotating drum is impregnated into the filter skeleton wound around the cylindrical net portion of the rotating drum, and the other part is impregnated into the filter skeleton. It is pierced, and the remaining large amount is laminated on the surface of the filter skeleton in various directions and entangled with the pierced cellulose nanofibers, and extends from the cellulose nanofiber fibers of the laminated portion and the filter skeleton. It is a structure that forms a cellulose nanofiber layer in a state of being entangled with fibers.

[Fourth Invention]
The first reinforcing layer forming step and the second reinforcing layer forming step in the filter manufacturing method according to the first to third inventions are performed.
By dissolving the cationic starch in the water at a required ratio and preparing the reinforcing layer forming liquid in which the cellulose nanofibers are dispersed in the dissolved water at a required ratio, the network structure of the cellulose nanofiber layer is strengthened. It is a configuration that enhances the flattening holding power and strengthens the bond between the cellulose nanofiber layer and the filter skeleton.

[Fifth Invention]
The first dry fixing step and the second dry fixing step in the filter manufacturing method according to the first to fourth inventions are performed.
The filter skeleton on which the cellulose nanofiber layer is formed, which is derived after completing the reinforcing layer forming step, is brought into contact with the surface opposite to the surface on which the cellulose nanofiber layer is formed to absorb water, and then absorb water. The cellulose nanofiber layer is flattened by drying to remove the remaining water, and then a pressing force is applied to the cellulose nanofiber layer, and the cellulose pierced into the filter frame in the reinforcing layer forming step. It is a configuration that processes nanofibers so that they are pierced deeper.

[Sixth Invention]
In the filter manufacturing method according to the first to fifth inventions, the drying treatment in the first drying and fixing step and the second drying and fixing step is configured to apply heat transfer, radiant heat, or hot air.

[7th invention]
In the filter manufacturing method according to the first to sixth inventions, the filter skeleton uses a web formed of filter paper, a non-woven fabric, a woven fabric, or a plastic film in which micropores are dispersed without gaps on one surface.

[8th invention]
The filter manufacturing apparatus according to the eighth invention is
A series of winding the filter skeleton from a roll-like state, running the filter skeleton, providing the reinforcing layer on one surface of the filter skeleton, drying and fixing the filter skeleton, and winding the filter skeleton into a roll that can be reused for an impurity treatment device filter to obtain the filter. As a processing means of
A reinforcing layer forming portion for forming the cellulose nanofibers to be the reinforcing layer in a film shape on one side of the filter frame, and a reinforcing layer forming portion.
A dry fixing portion for fixing the laminated cellulose nanofiber layer to the filter skeleton while drying and pressing the laminated cellulose nanofiber layer while the filter skeleton is running.
A configuration including a filter winding portion for obtaining the filter that can be reused as an impurity treatment apparatus filter by winding the filter frame having the cellulose nanofiber layer formed on one side in a roll shape after finishing the treatment of the drying fixing portion. Is.

Then, the reinforcing layer forming portion is
A fiber laminating treatment tank that stores a reinforcing layer forming liquid in which cellulose nanofibers are dispersed in water at a required ratio, and a cylindrical net portion that is driven and rotated or rotatably provided in the fiber laminating treatment tank. The rotating drum having the above, the arc-shaped cylindrical portion close to the inner peripheral surface of the cylindrical net portion, and the arc-shaped cylindrical portion provided in the rotating drum and supported by the tank body to close the periphery other than the arc-shaped cylindrical portion to hold the arc-shaped cylindrical portion. A suction box provided with a box body to be provided, and a drainage port provided through the box body and the tank body to discharge the liquid in the box body to the outside of the tank.
The filter skeleton that is unwound from the rolled state is wound around the cylindrical net portion of the rotating drum to run, and the liquid in the suction box is discharged to the outside of the tank to release the hydraulic pressure in the suction box. The pressure is reduced so as to be lower than the hydraulic pressure of the reinforcing layer forming liquid on the outer periphery of the rotating drum, and under the action of this reduced pressure, the water content of the reinforcing layer forming liquid on the outer periphery of the rotating drum is allowed to flow through the mesh holes of the filter frame. In addition, the cellulose nanofibers dispersed in the reinforcing layer forming liquid are not allowed to flow, but are laminated on the surface of the filter frame to form the cellulose nanofiber layer.

[Ninth invention]
The filter manufacturing apparatus according to the ninth invention is
As a series of processing means for feeding and traveling from a state in which the filter skeleton is wound in a roll shape, providing the reinforcing layer on one surface of the filter skeleton, and drying and fixing the filter skeleton.
A first reinforcing layer forming portion for forming the cellulose nanofibers serving as the reinforcing layer in a film shape on the one surface of the filter frame, and
It is provided with a first dry fixing portion for fixing the laminated cellulose nanofiber layer to the filter skeleton while drying and pressing the laminated cellulose nanofiber layer while the filter skeleton is running.
As a series of processing means for obtaining the filter by providing the reinforcing layer on the other surface of the filter frame after the treatment at the first dry fixing portion.
A second reinforcing layer forming portion for forming the cellulose nanofibers to be the reinforcing layer in a film shape on the other surface on the opposite side of the reinforcing layer formed on the filter skeleton.
A second dry fixing portion for fixing the laminated cellulose nanofiber layer to the filter skeleton by drying and pressing the laminated cellulose nanofiber layer while the filter skeleton is running is provided.
Further, a filter winding unit for obtaining the filter that can be reused as an impurity treatment apparatus filter by winding the filter frame having the cellulose nanofiber layers formed on both sides after the treatment of the second dry fixing portion in a roll shape. It is a configuration equipped with.

Then, the first reinforcing layer forming portion and the second reinforcing layer forming portion are
A fiber laminating treatment tank that stores a reinforcing layer forming liquid in which cellulose nanofibers are dispersed in water at a required ratio, and a cylindrical net portion that is driven and rotated or rotatably provided in the fiber laminating treatment tank. The rotating drum having the above, the arc-shaped cylindrical portion close to the inner peripheral surface of the cylindrical net portion, and the arc-shaped cylindrical portion provided in the rotating drum and supported by the tank body to close the periphery other than the arc-shaped cylindrical portion to hold the arc-shaped cylindrical portion. A suction box provided with a box body to be provided, and a drainage port provided through the box body and the tank body to discharge the liquid in the box body to the outside of the tank.
The filter skeleton that is unwound from the rolled state is wound around the cylindrical net portion of the rotating drum to run, and the liquid in the suction box is discharged to the outside of the tank to release the hydraulic pressure in the suction box. The pressure is reduced so as to be lower than the hydraulic pressure of the reinforcing layer forming liquid on the outer periphery of the rotating drum, and under the action of this reduced pressure, the water content of the reinforcing layer forming liquid on the outer periphery of the rotating drum is allowed to flow through the mesh holes of the filter frame. In addition, the cellulose nanofibers dispersed in the reinforcing layer forming liquid are not allowed to flow, but are laminated on the surface of the filter frame to form the cellulose nanofiber layer.

[10th invention]
In the filter manufacturing apparatus according to the eighth or ninth invention, the first reinforcing layer forming portion and the second reinforcing layer forming portion are
A part of the cellulose nanofibers dispersed in the reinforcing layer forming liquid on the outer periphery of the rotating drum is impregnated into the filter skeleton wound around the cylindrical net portion of the rotating drum, and the other part is impregnated into the filter skeleton. It is pierced, and the remaining large amount is laminated on the surface of the filter skeleton in various directions and entangled with the pierced cellulose nanofibers, and extends from the cellulose nanofiber fibers of the laminated portion and the filter skeleton. It is a configuration that is a processing unit that forms a cellulose nanofiber layer in a state of being entangled with fibers.

[11th invention]
In the filter manufacturing apparatus according to the eighth or ninth invention, the reinforcing layer forming portion, the first reinforcing layer forming portion, and the second reinforcing layer forming portion are
By dissolving the cationic starch in the water at a required ratio and preparing the reinforcing layer forming liquid in which the cellulose nanofibers are dispersed in the dissolved water at a required ratio, the network structure of the cellulose nanofiber layer is strengthened. The structure is such that the flattening holding power is enhanced and the bond between the cellulose nanofiber layer and the filter skeleton is strengthened.

[12th invention]
In the filter manufacturing apparatus according to the eleventh invention, the liquid storage tank corresponds to each of the reinforcing layer forming portion, the first reinforcing layer forming portion and the second reinforcing layer forming portion, and the reinforcing layer. At least one of the forming portion, the first reinforcing layer forming portion, and the second reinforcing layer forming portion includes a low-concentration liquid storage tank for storing the reinforcing layer forming liquid having a low dispersion concentration of cellulose nanofibers, and cellulose. A high-concentration liquid storage tank for storing the reinforcing layer-forming liquid having a high dispersion concentration of nanofibers is provided so that the liquid can be supplied in a switchable manner.

[13th invention]
In the filter manufacturing apparatus according to the eighth to twelfth inventions, the dry fixing part, the first dry fixing part and the second dry fixing part are
The filter skeleton on which the cellulose nanofiber layer is formed, which is guided after the treatment of the reinforcing layer forming portion, is contacted and rotated on the surface opposite to the surface on which the cellulose nanofiber layer is formed to absorb water. Next, drying was performed to remove the remaining water, and then a pressing force was applied to the cellulose nanofiber layer to flatten the cellulose nanofiber layer and pierce the filter skeleton at the reinforcing layer forming portion. The structure is such that the cellulose nanofibers are processed so as to be pierced deeper.

[14th invention]
In the filter manufacturing apparatus according to the eighth to thirteenth inventions, the drying treatment in the first drying fixing portion and the second drying fixing portion is configured to apply heat transfer, radiant heat, or hot air.

[15th invention]
In the filter manufacturing apparatus according to the eighth to fourteenth inventions, the filter skeleton is configured to use a web formed by dispersing fine holes on one surface of a filter paper, a non-woven fabric, a woven fabric, or a plastic film without any gaps.

In addition to the above-mentioned first to fifteenth inventions, the above-described embodiments also include the following inventions.
(1) With a single-sided coating, two tanks are provided to store CNF dispersions with different concentrations, and the tanks used to make different film thicknesses are switched.
(2) With double-sided coating, two CNF dispersion storage tanks are provided corresponding to the upper CNF formation tank to store CNF dispersions with different concentrations, and the tank used to make a difference in film thickness is switched. Two CNF dispersion storage tanks are provided corresponding to the lower CNF formation tank to store CNF dispersions with different concentrations, and the tank used to make a difference in film thickness is switched.
(3) A configuration that makes a difference between the film thickness of the CNF layer on one surface and the film thickness of the CNF layer on the other surface supplied to the tank.

F1, F2 ... Filter,
1 ... Filter supply unit,
2 ... Filtration tank,
3 ... Brushing part,
4 ... Mesh hole clogging elimination part,
5 ... Dry fixing part,
6 ... Filter winding part,
11 ... Filter skeleton,
11a ... mesh hole,
12, 12A, 12B ... Reinforcing layer (cellulose nanofiber layer),
20 ... Filter manufacturing equipment,
21 ... Filter skeleton supply unit,
21a ... Bracket,
21b ... Rotation axis,
21c ... Nip roll,
21d ... Filter skeleton feeding roll,
21e ... motor,
… Motors 21e, 22b2, 25c, 24c,
22 ... Reinforcing layer forming part,
22a ... Processing tank for fiber lamination,
22a1 ... Tank body,
22a2 ... Liquid introduction part,
22a3 ... Liquid inlet,
22a4 ... Liquid drain port,
22a5 ... Liquid drain valve,
22a6 ... Liquid level high level sensor,
22a7 ... Liquid level low level sensor,
22b ... Rotating drum,
22b1 ... Horizontal axis,
22b2 ... Motor,
22b3 ... Cylindrical net unit,
22c ... Suction box,
22c1 ... Arc-shaped cylinder,
22c2 ... Box body,
22c3 ... Liquid outlet,
23, 23A ... Dry fixing part,
23a, 23d ... Guide roll,
23b ... Water absorption roll,
23c ... Vacuum pipe,
23e ... Guide roll pair,
23f ... Electric heater pair,
23g ... Guide roll pair,
23h, 23i ... Heater roll,
23j ... Rolling roll pair,
23k, 23m, 23n ... Guide roll,
24 ... Filter winding part,
24a ... Bracket,
24b ... Rotating shaft for winding,
24c ... motor,
24d ... Guide roll,
25 ... Accumulator,
25a, 25d ... Guide roll,
25b ... Filter skeleton traction roll,
25c ... motor,
25e ... Step roll,
25f ... Guide roll,
26 ... Liquid storage tank,
27 ... Liquid supply pipe,
28 ... Liquid supply pump,
29 ... Liquid receiving tank,
30 ... Suction tube,
31 ... Suction pump,
40 ... Filter manufacturing equipment,
41 ... Filter skeleton supply unit,
42 ... First reinforcing layer forming portion,
42a ... Processing tank for fiber lamination,
42b ... Rotating drum,
42c ... Suction box,
43 ... First dry fixing part,
44 ... Second reinforcing layer forming portion,
44a ... Processing tank for fiber lamination,
44b ... Rotating drum,
44c ... Suction box,
45 ... Second dry fixing part,
46 ... Filter winding part,
50 ... 1st filter transition part,
50a ... Drive roll for towing,
50b ... motor,
50c ... Nip roll,
50d, 50e, 50f ... Guide roll,
60 ... Second filter transition part,
60a ... Guide roll,
60b, 60c ... Guide roll.

Claims (15)

A filter in which a filter skeleton having mesh holes and a cellulose nanofiber layer, which is a reinforcing layer laminated on one side of the filter skeleton, are wound in a roll shape, and the filter is wound in a roll shape. In a state where the liquid to be treated is fed out of the state and continuously moves by blocking the flow path of the liquid to be treated containing fine-grained solid impurities, the liquid to be treated is allowed to flow through the mesh holes, and the solid impurities are allowed to flow. A method for manufacturing the filter, which captures on the surface of the filter.
As a series of processing steps for obtaining the filter by providing the reinforcing layer on one surface of the filter skeleton and winding the filter skeleton in a roll shape.
A reinforcing layer forming step of forming the cellulose nanofiber layer serving as the reinforcing layer on one side of the filter skeleton in a film form,
A drying fixing step of drying and pressing the laminated cellulose nanofiber layer while the filter skeleton is running, and a drying fixing step of fixing the laminated cellulose nanofiber layer to the filter skeleton.
The drying fixing step includes a filter winding step of winding the filter skeleton having the cellulose nanofiber layer formed on one side in a roll shape to obtain the filter that can be reused as an impurity treatment apparatus filter.
The reinforcing layer forming step is
The filter skeleton that is unwound from the rolled state is guided into a fiber laminating treatment tank that stores a reinforcing layer forming liquid in which cellulose nanofibers are dispersed in a required ratio in water, and the fiber laminating treatment is performed. A process for laminating fibers by winding the liquid in a suction box provided in the rotating drum around the cylindrical net portion of a rotating drum having a cylindrical net portion provided to be driven and rotated in a tank or rotatably provided. By discharging the water to the outside of the tank, the hydraulic pressure in the suction box is reduced to be lower than the hydraulic pressure of the reinforcing layer forming liquid on the outer periphery of the rotary drum, and the outer periphery of the rotary drum is reinforced under the action of this depressurization. The cellulose nanofibers that allow the water content of the layer-forming liquid to pass through the mesh holes of the filter skeleton and are dispersed in the reinforcing layer-forming liquid are not allowed to pass through, but are laminated on the surface of the filter skeleton to form a cellulose nanofiber layer. filter production method which is a configuration that form a. A filter in which a filter skeleton having mesh holes and a cellulose nanofiber layer which is a reinforcing layer laminated on both sides of the filter skeleton are wound in a roll shape, and the filter is wound in a roll shape. In a state where the liquid to be treated is fed out of the state and continuously moves by blocking the flow path of the liquid to be treated containing fine-grained solid impurities, the liquid to be treated is allowed to flow through the mesh holes, and the solid impurities are allowed to flow. A method for manufacturing the filter, which captures on the surface of the filter.
As a series of processing steps of extending the filter skeleton from a rolled state and providing the reinforcing layer on one surface of the filter skeleton.
A first reinforcing layer forming step of forming the cellulose nanofiber layer to be the reinforcing layer in a film shape on one surface of the filter frame, and
The process includes a first drying fixing step of drying and pressing the laminated cellulose nanofiber layer while the filter skeleton is running, and fixing the laminated cellulose nanofiber layer to the filter skeleton.
As a series of treatment steps for obtaining the filter by providing the reinforcing layer on the other surface of the filter skeleton after the treatment in the first drying and fixing step.
A second reinforcement layer forming step of forming the cellulose nanofiber layer serving as the reinforcing layer on the other surface opposite to the reinforcing layer formed on the filter skeleton in a film form,
The present invention includes a second drying fixing step of drying and pressing the laminated cellulose nanofiber layer while the filter skeleton is running, and fixing the laminated cellulose nanofiber layer to the filter skeleton.
Further, after the treatment of the second drying and fixing step is completed, the filter skeleton having the cellulose nanofiber layers formed on both surfaces of the filter skeleton is wound into a roll to obtain the filter that can be reused as an impurity treatment apparatus filter. Including winding process
The first reinforcing layer forming step and the second reinforcing layer forming step
The filter skeleton is guided into a fiber laminating treatment tank that stores a reinforcing layer forming liquid in which cellulose nanofibers are dispersed in a required ratio in water, and is driven and rotated in the fiber laminating processing tank. The suction box is wound around the cylindrical net portion of a rotary drum having a cylindrical mesh portion provided as possible, and the liquid in the suction box provided in the rotary drum is discharged to the outside of the fiber laminating processing tank. The hydraulic pressure inside is reduced to be lower than the hydraulic pressure of the reinforcing layer forming liquid on the outer periphery of the rotating drum, and under the action of this reduced pressure, the water content of the reinforcing layer forming liquid on the outer periphery of the rotating drum is reduced to the mesh of the filter frame. wherein the hole in flowed through, and for the cellulose nanofibers dispersed in the reinforcing layer forming solution is not flowed through, the so laminated on the surface of the filter skeleton is a configuration that form a cellulose nanofiber layer Filter manufacturing method. It said first reinforcement layer forming step and the second reinforcement layer forming step,
A part of the cellulose nanofibers dispersed in the reinforcing layer forming liquid on the outer periphery of the rotating drum is impregnated into the filter skeleton wound around the cylindrical net portion of the rotating drum, and the other part is impregnated into the filter skeleton. It is pierced, and the remaining large amount is laminated on the surface of the filter skeleton in various directions and entangled with the pierced cellulose nanofibers, and extends from the cellulose nanofiber fibers of the laminated portion and the filter skeleton. The filter manufacturing method according to claim 2 , wherein the cellulose nanofiber layer is formed in a state of being entangled with fibers. It said first reinforcement layer forming step and the second reinforcement layer forming step,
By dissolving the cationic starch in the water at a required ratio and preparing the reinforcing layer forming solution in which the cellulose nanofibers are dispersed in the dissolved water at a required ratio, the network structure of the cellulose nanofiber layer is strengthened. The filter manufacturing method according to claim 3, further comprising a treatment method for increasing the flattening holding power and strengthening the bond between the cellulose nanofiber layer and the filter skeleton. The first dry fixing step and the second dry fixing step are carried out.
A surface opposite to the surface on which the cellulose nanofiber layer is formed with respect to the filter skeleton on which the cellulose nanofiber layer is formed, which is derived after completing the first reinforcing layer forming step and the second reinforcing layer forming step. The cellulose nanofiber layer is flattened and the reinforcing layer is formed by contact-rotating and absorbing water, then drying to remove the remaining water, and then applying a pressing force to the cellulose nanofiber layer. The filter manufacturing method according to claim 2 or 4 , wherein in the step, the cellulose nanofibers pierced into the filter skeleton are processed so as to pierce the cellulose nanofibers deeper. The first drying fixing step and extent the second drying constant construction, the filter manufacturing method according to claim 2 or 4, characterized in that a process of applying heat transfer, radiation heat or hot air. The filter manufacturing method according to any one of claims 1 to 6, wherein the filter skeleton uses a web formed of filter paper, a non-woven fabric, a woven fabric, or a plastic film in which micropores are dispersed without gaps on one surface. A filter in which a filter skeleton having mesh holes and a cellulose nanofiber layer, which is a reinforcing layer laminated on one side of the filter skeleton, are wound in a roll shape, and the filter is wound in a roll shape. In a state where the liquid to be treated is fed out of the state and continuously moves by blocking the flow path of the liquid to be treated containing fine-grained solid impurities, the liquid to be treated is allowed to flow through the mesh holes, and the solid impurities are allowed to flow. not those trapped in the filter surface, a full Iruta manufacturing apparatus,
A series of winding the filter skeleton from a roll-like state, running the filter skeleton, providing the reinforcing layer on one surface of the filter skeleton, drying and fixing the filter skeleton, and winding the filter skeleton into a roll that can be reused for an impurity treatment device filter. As a processing means of
A reinforcing layer forming portion for forming the cellulose nanofiber layer to be the reinforcing layer in a film shape on one surface of the filter frame, and a reinforcing layer forming portion.
A dry fixing portion for fixing the laminated cellulose nanofiber layer to the filter skeleton while drying and pressing the laminated cellulose nanofiber layer while the filter skeleton is running.
The filter skeleton having the cellulose nanofiber layer formed on one surface after the treatment of the dry fixing portion is wound in a roll shape, and the filter winding portion for obtaining the filter that can be reused as an impurity treatment apparatus filter is provided.
The reinforcing layer forming portion is
A fiber laminating treatment tank that stores a reinforcing layer forming liquid in which cellulose nanofibers are dispersed in water at a required ratio, and a cylindrical net portion that is driven and rotated or rotatably provided in the fiber laminating treatment tank. The rotating drum having the above, the arc-shaped cylindrical portion close to the inner peripheral surface of the cylindrical net portion, and the periphery other than the arc-shaped cylindrical portion provided in the rotating drum and supported by the fiber laminating processing tank main body are closed. It has a box body that holds the arc-shaped cylindrical portion, and a drainage port that is provided so as to penetrate the box body and the fiber laminating processing tank body and discharges the liquid in the box body to the outside of the fiber laminating processing tank. Equipped with a suction box,
The suction box is driven by winding the filter skeleton, which is unwound from the rolled state, around the cylindrical net portion of the rotating drum, and discharging the liquid in the suction box to the outside of the fiber laminating processing tank. The hydraulic pressure inside is reduced to be lower than the hydraulic pressure of the reinforcing layer forming liquid on the outer periphery of the rotating drum, and under the action of this reduced pressure, the water content of the reinforcing layer forming liquid on the outer periphery of the rotating drum is reduced to the mesh of the filter frame. The cellulose nanofibers that flow through the pores and are dispersed in the reinforcing layer forming liquid are characterized in that they are not allowed to flow and are laminated on the surface of the filter frame to form a cellulose nanofiber layer. Filter manufacturing equipment. A filter in which a filter skeleton having mesh holes and a cellulose nanofiber layer which is a reinforcing layer laminated on both sides of the filter skeleton are wound in a roll shape, and the filter is wound in a roll shape. In a state where the liquid to be treated is fed out of the state and continuously moves by blocking the flow path of the liquid to be treated containing fine-grained solid impurities, the liquid to be treated is allowed to flow through the mesh holes, and the solid impurities are allowed to flow. not those trapped in the filter surface, a full Iruta manufacturing apparatus,
As a series of processing means for feeding and traveling from a state in which the filter skeleton is wound in a roll shape, providing the reinforcing layer on one surface of the filter skeleton, and drying and fixing the filter skeleton.
A first reinforcing layer forming portion for forming the cellulose nanofiber layer serving as the reinforcing layer in a film shape on the one surface of the filter frame, and
It is provided with a first dry fixing portion for fixing the laminated cellulose nanofiber layer to the filter skeleton while drying and pressing the laminated cellulose nanofiber layer while the filter skeleton is running.
As a series of processing means for obtaining the filter by providing the reinforcing layer on the other surface of the filter frame after the treatment at the first dry fixing portion.
A second reinforcing layer forming portion for forming the cellulose nanofiber layer to be the reinforcing layer in a film shape on the other surface on the opposite side of the reinforcing layer formed on the filter skeleton.
A second dry fixing portion for fixing the laminated cellulose nanofiber layer to the filter skeleton by drying and pressing the laminated cellulose nanofiber layer while the filter skeleton is running is provided.
Further, a filter winding unit for obtaining the filter that can be reused as an impurity treatment apparatus filter by winding the filter frame having the cellulose nanofiber layers formed on both sides after the treatment of the second dry fixing portion in a roll shape. Equipped with
The first reinforcing layer forming portion and the second reinforcing layer forming portion
A fiber laminating treatment tank that stores a reinforcing layer forming liquid in which cellulose nanofibers are dispersed in water at a required ratio, and a cylindrical net portion that is driven and rotated or rotatably provided in the fiber laminating treatment tank. The rotating drum having the above, the arc-shaped cylindrical portion close to the inner peripheral surface of the cylindrical net portion, and the periphery other than the arc-shaped cylindrical portion provided in the rotating drum and supported by the fiber laminating processing tank main body are closed. It has a box body that holds the arc-shaped cylindrical portion, and a drainage port that is provided so as to penetrate the box body and the fiber laminating processing tank body and discharges the liquid in the box body to the outside of the fiber laminating processing tank. Equipped with a suction box,
The suction box is driven by winding the filter skeleton, which is unwound from the rolled state, around the cylindrical net portion of the rotating drum, and discharging the liquid in the suction box to the outside of the fiber laminating processing tank. The hydraulic pressure inside is reduced to be lower than the hydraulic pressure of the reinforcing layer forming liquid on the outer periphery of the rotating drum, and under the action of this reduced pressure, the water content of the reinforcing layer forming liquid on the outer periphery of the rotating drum is reduced to the mesh of the filter frame. The cellulose nanofibers that flow through the pores and are dispersed in the reinforcing layer forming liquid are characterized in that they are not allowed to flow and are laminated on the surface of the filter frame to form a cellulose nanofiber layer. Filter manufacturing equipment. The first reinforcing layer forming portion and the second reinforcing layer forming portion
A part of the cellulose nanofibers dispersed in the reinforcing layer forming liquid on the outer periphery of the rotating drum is impregnated into the filter skeleton wound around the cylindrical net portion of the rotating drum, and the other part is impregnated into the filter skeleton. It is pierced, and the remaining large amount is laminated on the surface of the filter skeleton in various directions and entangled with the pierced cellulose nanofibers, and extends from the cellulose nanofiber fibers of the laminated portion and the filter skeleton. The filter manufacturing apparatus according to claim 9 , wherein the processing unit forms a cellulose nanofiber layer in a state of being entangled with fibers. Before first reinforcing layer forming unit and the second reinforcing layer forming unit SL is
By dissolving the cationic starch in the water at a required ratio and preparing the reinforcing layer forming solution in which the cellulose nanofibers are dispersed in the dissolved water at a required ratio, the network structure of the cellulose nanofiber layer is strengthened. The filter manufacturing apparatus according to claim 9 , further comprising a processing unit that enhances the flattening holding power and strengthens the bond between the cellulose nanofiber layer and the filter skeleton. At least one of the previous first reinforcing layer forming portion SL and the second reinforcing layer forming unit, and the low-density liquid storage tank dispersion concentration of the cellulose nanofibers storing lower the reinforcing layer forming liquid, the cellulose nanofiber The filter manufacturing apparatus according to claim 11, further comprising a high-concentration liquid storage tank for storing the reinforcing layer-forming liquid having a high dispersion concentration and capable of supplying liquid in a switchable manner. Before first drying fixing unit and the second drying fixing unit SL is
The side opposite to the surface on which the cellulose nanofiber layer is formed with respect to the filter skeleton on which the cellulose nanofiber layer is formed, which is derived after the treatment of the first reinforcing layer forming portion and the second reinforcing layer forming portion is completed. The surface of the cellulose nanofiber layer is contact-rotated to absorb water, and then dried to remove the remaining water, and then a pressing force is applied to the cellulose nanofiber layer to flatten the cellulose nanofiber layer and reinforce the cellulose nanofiber layer. The filter manufacturing apparatus according to any one of claims 9 to 12, wherein the layer forming portion is configured to process the cellulose nanofibers pierced into the filter skeleton so as to pierce the cellulose nanofibers deeper. Wherein said drying treatment that put the first drying and fixing unit and the second drying fixing unit, heat transfer, radiation heat or to any one of claims 9 to 13, characterized in that hot air is a process shed, The filter manufacturing apparatus described. The filter manufacturing according to any one of claims 8 to 14, wherein the filter skeleton uses a web formed of filter paper, a non-woven fabric, a woven fabric, or a plastic film in which micropores are dispersed without gaps on one surface. apparatus.

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