JP7399208B2 - Spraying device for spraying liquid containing fine fibers and spraying method using a spraying device for spraying liquid containing fine fibers - Google Patents

Description

The present invention relates to a spraying device for a spraying liquid containing fine fibers and a spraying method using the spraying device for a spraying liquid containing fine fibers.

In recent years, in the general agricultural field such as arable farming and livestock farming, various types of spraying equipment have been used to spread various effective effects on farms and livestock barns for various purposes such as increasing yields and improving the environment of livestock barns. Spreading/spraying a spray liquid containing ingredients.

In order to solve the problem of providing a plant cultivation agent that can be used as a spray agent with low environmental impact and high safety, the applicant of the present application disclosed in Patent Document 1 that a plant cultivation agent that contains cellulose nanofibers and that can be used directly or indirectly on plants. A plant cultivation agent which is added, sprinkled or sprayed and whose insecticidal active ingredient is cellulose nanofibers is disclosed.

In addition, the applicant of the present application discloses in Patent Document 2 that in order to solve the problem of easily preparing the breeding environment for livestock etc. and improving the working environment of employees, the applicant has introduced microfibers of 1 to 100 μm or An environment-improving nutrient dispersion for livestock housing containing fibers having a nanofiber fiber width of 3 to 1000 nm is disclosed.

Furthermore, Patent Document 3 describes (a) an agricultural biologically active substance, a fungicide, Pesticides, herbicides, and/or plant growth regulators. Compositions are disclosed that include (b) a fibril or microfibril or nanofibril structuring agent, and (c) a cosurfactant. However, there is no mention of any specific examples of spraying on farms, livestock barns, etc.

Patent No. 6639036 Patent No. 6867613 Special Publication No. 2020-531420

Although it depends on the scale of cultivation and livestock farming, in the agricultural field as a whole, a relatively large amount of spray liquid is generally sprayed on cultivated land, livestock sheds, etc. The time required for dispersion/spraying usually increases in proportion to the amount of the spray liquid.

On the other hand, fine fibers such as cellulose nanofibers are fibrous substances with a high aspect ratio. It is thought that the spray will become clogged with the water, making it impossible to spray continuously. Therefore, especially when spraying a spray solution containing microfibers with a fiber width of 1 to 100 μm, it is necessary to frequently disassemble and clean the nozzle, etc., in order to efficiently spread and spray the spray solution. The problem is that it cannot be done.

In addition, when fine fibers such as cellulose nanofibers are present in various solvents, the fine fibers coagulate with each other, causing them to settle and become unevenly distributed in the spraying device. There is a high possibility that it will go away. Therefore, a problem can be assumed that it is not possible to spread/spray the spray liquid containing fine fibers while keeping the concentration of the spray liquid uniform.

In view of the above-mentioned problems, the present invention provides a spraying device and a spraying device capable of efficiently distributing a spray solution containing a large amount of fine fibers in general agricultural fields such as cultivation agriculture and livestock farming. The object of the present invention is to provide a spraying method using a liquid spraying device.

As a result of intensive studies to achieve the above object, the present inventors have found that the above problem can be solved by making the spray liquid in a fluid state in order to prevent the fine fibers from coagulating with each other. This is the heading that led to the completion of the present invention.

That is, the spraying device for a spraying liquid containing fine fibers of the present invention includes at least a storage tank having a circulation return port and a spraying liquid input port, a spray nozzle, a circulation port, a discharge port, and a water intake port. a power sprayer, a circulation pipe whose one end is connected to the circulation port and whose other end is input to the spray liquid input port, and a discharge pipe whose one end is connected to the discharge port and whose other end is connected to the spray nozzle; A water suction pipe connected at one end to the water suction port and the other end connected to the storage tank, and a suction port of the water suction pipe connected to the storage tank, maintaining a distance between the bottom surface of the storage tank and the suction port. and a member for.

In addition, in a method of spraying a spray liquid containing fine fibers using a spraying device, a first diluted body is prepared by diluting the dispersion containing fine fibers with water 5 to 10 times the volume of the dispersion. a mixing step having a first dilution step of diluting the first diluent with water to obtain a spray liquid containing fine fibers at a predetermined concentration; The method includes a circulation step of circulating the contained spray liquid using the storage tank, the circulation piping, and a power sprayer, and a spraying step of spraying the spray liquid to a predetermined location using the spray nozzle.

The present invention provides a spraying device and a spraying method using the spraying device that can efficiently spray a large amount of fine fibers in general agricultural fields such as arable farming and livestock farming.

FIG. 1 is a conceptual diagram of a spraying device for a spraying liquid containing fine fibers according to an embodiment of the present invention. This is a spray nozzle that has a rotating mechanism that includes a core that has a spiral groove. It is a foam nozzle with an outside air intake port. This is an embodiment of a member for maintaining the distance between the bottom surface of a storage tank and a water intake port according to an embodiment of the present invention. This is another embodiment of the member for maintaining the distance between the bottom surface of the storage tank and the water intake port according to the embodiment of the present invention. This figure shows a part of the spray liquid containing fine fibers. This figure shows how a spray liquid containing fine fibers is sprayed. This figure shows a part of the liquid prepared in Comparative Example 1.

Next, embodiments of the present invention will be described in detail. However, the following embodiments are for helping understanding the invention, and are not intended to limit the invention.

(Definition of terms)
The term "fine fiber" according to the present invention refers to microfibers with a fiber width of 1 to 100 μm and fiber length of 0.1 to 10 mm, and nanofibers with a fiber width of 3 to 1000 nm and fiber length of 1 to 200 μm. It is a concept that includes.
In addition, its derived components and its manufacturing method are described in the method for manufacturing fine fibers described in Japanese Patent No. 6867613, and cellulose nanofibers and cellulose nanocrystals using cellulose as a natural polymer described in Japanese Patent No. 6704551. Reference can be made to the method for preparing an aqueous solution and the method for producing fine fibers using other raw materials as derived components described in both publications.
The term "dispersion containing fine fibers" refers not only to a dispersion containing fine fibers consisting of fine fibers and a solvent, but also to fine fibers in which powdered fine fibers are dispersed using a solvent. The concept includes a dispersion containing .

(Spraying device for spraying liquid containing fine fibers)
First, referring to FIG. 1, a spraying device 1 for spraying liquid containing fine fibers according to an embodiment of the present invention will be described.
The spraying device 1 of the present invention includes a storage tank 2 having a circulation return port 3 and a spray liquid input port 4, a power sprayer 9 including a spray nozzle 5, a circulation port 6, a discharge port 7, and a water intake port 8. , a circulation pipe 10 whose one end is connected to the circulation port 6 and the other end to the circulation return port 3; and a discharge pipe 11 whose one end is connected to the discharge port 7 and the other end is connected to the spray nozzle 5. and a water suction pipe 12 whose one end is connected to the water suction port 8 and the other end is connected to the storage tank 2, and the bottom surface of the storage tank 2 is connected to the suction port 13 of the water suction pipe 12 connected to the storage tank 2. A member 14 for maintaining a distance from the suction port 13 is provided.

The storage tank 2 comprises at least a circulation return port 3, a spray liquid inlet 4 for supplying a spray liquid containing fine fibers, and a connection 15 for connection to a water intake 8 of a power sprayer. Further, the circulation return port may be connected to the circulation pipe 10 to the spray liquid input port 4, and further may be connected to the suction port 13 using a hose or the like.
Further, the bottom surface of the storage tank 2 may be sloped so that the member 14 is at a lower position, in which case the amount of remaining liquid can be reduced.
Furthermore, the storage tank 2 may be equipped with a heating mechanism, a cooling mechanism, a pressurizing mechanism, a stirring mechanism, and the like.

Although the spray nozzle 5 is not particularly limited and can be any commercially available general nozzle, a particularly optimal nozzle shape will be described with reference to FIGS. 2 and 3.
FIG. 2 shows a spray nozzle having a rotating mechanism (swivel mechanism) including a core 17 having a spiral groove 16. A rotating mechanism (swivel mechanism) refers to a mechanism that uses the movement of fluid to generate a rotational flow in the fluid. This rotating flow prevents the fibers from settling and reduces the possibility of clogging due to aggregated fibers. Although the rotational flow may be promoted by external power such as a power sprayer, it is possible to generate a rotational flow and suppress sedimentation by changing the flow shape alone, which is even better from the viewpoint of energy saving and failure trouble.
FIG. 3 shows a foam nozzle with an outside air intake port 18. A foam nozzle refers to a nozzle that generates a bubble phase and a liquid phase. By using a foam nozzle, the fine fibers spread out like a film so as to be adsorbed to the outer surface of the foam phase, and by surrounding the foam phase, a uniform dispersion effect occurs, resulting in fiber aggregation and It prevents sedimentation and creates a uniform spray, giving good results. In such a foam nozzle, in order to efficiently take in outside air, it is necessary that the internal pressure be lower than the external pressure. For this reason, pores 24 and 25 through which the spray liquid passes are provided in the front flow path and the rear flow path of the outside air intake port 18, and the size of the pores 25 is larger than 24, so that outside air can be taken in from the outside air intake port 18. A suction force is generated.

The power sprayer 9, which includes a circulation port 6, a discharge port 7, and a water intake port 8, can be used as a machine for spraying liquid pesticides using a power source such as gasoline or electricity. It can be used without particular restrictions. Specifically, submersible pumps, battery-powered sprayers, etc. can be exemplified.

A circulation pipe 10 has one end connected to the circulation port 6 of the power sprayer 9 and the other end connected to the circulation return port 3, and a discharge pipe 11 has one end connected to the discharge port 7 and the other end connected to the spray nozzle 5. The water suction pipe 8, which has one end connected to the water suction port 8 and the other end connected to the storage tank 2, can be used without any particular restriction as long as it is used as this type of piping. Further, piping refers to a means for transferring liquid, and there is no particular restriction as long as it meets the purpose, and for example, stainless steel pipes, PVC piping, vinyl hoses, etc. can be used.

By using the power sprayer 9 and circulation piping 10 to feed the spray liquid from the storage tank 2 via the circulation return port 3, the spray liquid is again introduced into the storage tank 2 from the circulation return port 3. The spray liquid can be in a fluid state. This is called circulation of the spray liquid.

A member 14 for maintaining the distance between the bottom surface of the storage tank 2 and the suction port 13 is attached to the suction port 13 of the water suction pipe 12 connected to the storage tank 2. This is used to prevent contact with the bottom surface of the The shape of the member 14 is not particularly limited as long as it can achieve the above purpose, but some examples of specific member shapes will be presented below.

An embodiment of a member for maintaining the distance between the bottom surface of the storage tank and the water intake port will be described using FIG. 4. The member 14 in this embodiment is an existing strainer 19 with a plurality of weights 20 connected thereto. By doing so, the strainer 19 can be physically prevented from coming into direct contact with the bottom surface, and the distance between the bottom surface 21 of the storage tank and the water intake port 13 can be maintained.
Another embodiment of the member for maintaining the distance between the bottom surface of the storage tank and the water intake port will be described using FIG. 5. In the member 14 of this embodiment, a plurality of weights 20 are connected to a plate 22 having a water inlet 13 and a connection part, and a region 23 between the weights is provided with a grid-like mesh with an opening of 300 μm or more or a grid-like mesh with an opening of 200 μm or more. Spread a slit-shaped mesh. By doing so, by increasing the area of the suction part and lowering the suction flow velocity, it is possible to prevent heavy foreign matter such as sand that may be present on the bottom surface from being sucked up.
Although not shown, another embodiment of a member for maintaining the distance between the bottom of the storage tank and the water intake port is a member that prevents heavy foreign matter such as sand that is accumulated at the bottom of the storage tank from being directly sucked up. In order to maintain the distance from the bottom, for example, a flange with an opening of about 10 cm is provided on the side of the tank 2, and the lowest opening is about 1 cm above the bottom (that is, the flange is 1 cm from the bottom of the storage tank). (Provided at a somewhat elevated position.) There are several ways to connect the water suction pipe, or to directly connect a power sprayer and use this as the water suction port.

In the spraying device according to the present invention, depending on the fiber length of the fine fibers used, a lattice-like mesh with an opening of 300 μm or more is installed at any point in the flow path of the spray liquid containing the fine fibers. It is preferable to use a slit-like mesh with an opening of 200 μm or more depending on the fiber width of the fibers. Note that a slit shape allows fibers to pass through more easily, and heavy foreign substances such as sand can be easily removed. The slit width may be narrowed depending on the opening diameter of the nozzle used, and fine fibers of a size that can pass through the slit may be selected. However, reducing the size of the fine fibers may lead to an increase in the cost of the chemical solution, so it is necessary to select it depending on the application.
On the other hand, especially when using a nozzle diameter of 0.9 mm or more, such as in livestock farming, it is recommended not to use a grid-like mesh with an opening of less than 300 μm or a slit-like mesh with an opening of less than 200 μm in the spraying device according to the present invention. This allows even cheaper chemical solutions to be sprayed efficiently. If a lattice-like mesh with an opening of less than 300 μm or a slit with an opening of less than 200 μm is used, the fine fibers will clog the mesh or slit-like mesh, making it impossible to continue spreading. be.
Here, the necessity for the spraying device for spraying liquid containing fine fibers in the present invention to be provided with a member for maintaining the distance between the bottom of the storage tank and the water intake port and the mesh is as follows. .
In fields such as arable farming and livestock farming, 200 to 10,000 L of spray liquid containing various active ingredients is normally sprayed continuously for purposes such as increasing yields and improving the environment of livestock barns. Additionally, spraying equipment and storage tanks may be stored semi-outdoors or outdoors. In view of this situation, it can be said that there is a high probability that heavy foreign objects such as sand and pebbles or lightweight foreign objects such as vinyl will exist in the storage tank.
Further, for the above-mentioned applications, fine fibers such as microfibers with a fiber width of 1 to 100 μm or nanofibers with a fiber width of 3 to 1000 nm are not intentionally blended into the spray liquid that is normally sprayed.
Based on the above, there is a demand for a spraying device that is necessary to spray 200 to 10,000 L of a spray liquid containing fine fibers of the above width in a spraying device where heavy foreign matter is likely to be present in the storage tank. There is. In other words, the member for maintaining the distance between the bottom of the storage tank and the water intake port is designed to prevent heavy foreign objects such as sand and pebbles from being sucked into the bottom of the storage tank, as well as large lightweight foreign objects such as vinyl. It is also for. This is because, if a heavy foreign object or the like is sucked into the suction port, fine fibers may accumulate there, clog the nozzle tip, or damage the inside of the equipment. Large lightweight foreign objects such as vinyl may stick to the front of the nozzle and block it.
Furthermore, if a mesh that is finer than the lattice-like mesh with an opening of 300 μm or more used in the present invention or the slit-like mesh with an opening of 200 μm or more depending on the fiber width of the fine fibers used, This is because the particles adhere, accumulate, and become clogged, making it impossible to spray the spray liquid.

(Method of spraying a spray liquid containing fine fibers)
Next, a method for spraying a spray liquid containing fine fibers using the spray liquid spraying device containing fine fibers according to the present invention will be described.
Normally, in cultivation scales and livestock farming, the concentration of fine fibers in the spray liquid containing fine fibers is about 0.001 to 0.5%. Further, the concentration of fine fibers in the distributed dispersion liquid containing fine fibers is usually in the range of 0.1 to 15%, and often in the range of about 1 to 3%. Therefore, in order to obtain a spray liquid containing fine fibers, it is necessary to dilute the dispersion liquid. Furthermore, even when powdered fine fibers are used, it is necessary to add a solvent such as water to the powdered fine fibers to prepare a spray liquid containing the fine fibers.

(Mixing process)
As the mixing step of the present invention, either the mixing step (A) or the mixing step (B) can be selected.
The mixing step (A) includes a first dilution step in which a dispersion containing fine fibers is diluted with water of 5 to 10 times the volume of this dispersion to prepare a first diluted product; This process includes a second dilution step in which the first diluent is diluted with water to obtain a spray liquid containing fine fibers at a predetermined concentration.
More specifically, to explain an example of the mixing step (A), when the volume of the dispersion containing fine fibers is 200 L, this is diluted with 1000 to 2000 L of water, and then the desired amount is The solution is diluted with water to give a concentration of . Note that the dilution method at this time is not particularly limited; a portion of the water is stored in a storage tank, and then a dispersion containing fine fibers is added and mixed and stirred to prevent entanglement of the fine fibers. You may also use a method such as adding the remaining water while loosening.

The mixing step (B) includes a first dilution step in which a dispersion containing fine fibers is diluted with water to prepare a first diluted product having a concentration of 0.1% or more; , and a second dilution step of diluting the first diluent with water in an amount equal to or larger than that of the first diluent to obtain a spray liquid containing fine fibers at a predetermined concentration.
More specifically, to explain an example of the mixing step (B), when the concentration of the dispersion containing fine fibers is 1%, this is made to have a concentration of 0.1% or more using water. Then, the first diluent is diluted with water equal to or larger than the volume of the first diluent to obtain a spray liquid containing fine fibers at a predetermined concentration. Note that the dilution method at this time is not particularly limited; a portion of the water is stored in a storage tank, and then a dispersion containing fine fibers is added and mixed and stirred to prevent entanglement of the fine fibers. You may also use a method such as adding the remaining water while loosening.

By performing such a mixing step, it is possible to impart shear to the fine fibers in the first dilution step and loosen the entanglements between the fine fibers before implementing the second dilution step. Furthermore, it is possible to prevent fine fibers in the spray liquid containing fine fibers from aggregating with each other. On the other hand, if water is simply added to a dispersion containing fine fibers to achieve a predetermined concentration without performing the mixing process according to the present invention, the fine fibers will aggregate with each other, making it difficult to disperse the fine fibers. becomes difficult.
In addition, when the storage tank 2 is equipped with a heating mechanism, a cooling mechanism, a pressurizing mechanism, a stirring mechanism, etc., heating, cooling, pressurizing, stirring, etc. may be performed as appropriate.

(circulation process)
The circulation process uses a storage tank, circulation piping, and a power sprayer to transfer a spray liquid containing fine fibers between the storage tank and circulation piping through a circulation return port. This is a process of circulating a dispersion containing fine fibers and a spray solution containing fine fibers. With such a process, the power sprayer can be used to return the spray liquid to the storage tank so that the spray liquid in the storage tank is always in a fluid state. Therefore, as in the mixing process, it is possible to prevent fine fibers in the spray liquid containing fine fibers from remaining agglomerated together, and also to reduce the concentration difference of fine fibers in the storage tank. It can be prevented.
Further, in the circulation step of the present invention, by performing this step in the first dilution step and the second dilution step in the mixing step, an even better dispersion state can be obtained.

(Spraying process)
The spraying process is a spraying process in which a spray liquid containing fine fibers is sprayed onto a predetermined location using a spray nozzle.
The water absorption amount of the power sprayer may be 1 to 75 L/min, and the pressure may be 1 MPa or more, preferably 3 MPa or more.
Generally, a CNF dispersion liquid is known to be a dispersion liquid having thixotropic properties, and when the shear decreases, it becomes solid, and when the shear increases, it becomes liquid. When flowing CNF inside a pipe with an inner diameter of 20 mm (radius 10 mm) and measuring the flow rate with an external electromagnetic flow meter, if the flow rate is less than 5 L per minute, it becomes difficult to count with the flow meter. This is because below this flow rate, the fibers begin to exhibit solid properties and begin to settle and accumulate on the outside of the pipe. This threshold flow velocity can be calculated from the inner diameter and flow rate as shown below, and by constantly moving the liquid at this flow velocity value of 0.27 m/s or more, good dispersion properties can be maintained. Although the piping size and nozzle diameter of the equipment used will vary depending on the application, problems can be solved by freely setting the water supply amount and flow rate within a range that maintains the flow rate.
5 L/min × 0.001m3/L÷60 s / min ÷ (0.01 m × 0.01 m × π) ≒ 0.27 m/s

(Removal process)
In the removal process, through the mixing process, circulation process, and spraying process, heavy foreign substances such as sand and pebbles, or light foreign substances such as vinyl are removed from the storage tank using a member attached to the tip of the water absorption pipe on the storage tank side. It is a process. Since the member used in the present invention is for maintaining the distance between the bottom surface and the suction port, it is possible to prevent heavy foreign objects such as sand that may be present on the bottom surface of the storage tank from being sucked up. .

The present invention will be described below based on Examples, but the present invention is not limited to these Examples.

(Example 1)
Using a device having the same basic configuration as the spraying device for spraying liquid containing fine fibers shown in Figure 1 and members having the same basic configuration as the members shown in Figure 2, a spray liquid is created through the following steps, and this is used for poultry farming. It was dispersed in the field.
First, 10 L of CNF dispersion (CNF concentration 2%, manufactured by Chuetsu Pulp Industries Co., Ltd., trade name: nanoforest-S Farm) and 100 L of water were added to a storage tank to prepare a first dilution. Next, 290 L of water was added to prepare a spray liquid containing CNF (CNF concentration 0.05%). Figure 6 shows a portion of the spray liquid. It can be seen from FIG. 6 that a spray liquid with excellent CNF dispersibility could be prepared.
Next, the power sprayer was operated, and while the spraying liquid was being circulated using the storage tank and circulation piping, the entire amount of the prepared spraying liquid was sprayed using the spray nozzle. The time required to spray 400 L of the spray liquid was 40 minutes. Figure 7 shows how the spray liquid was sprayed.
When the spray nozzle and members were checked after spraying, no CNF was found to have adhered to the spray nozzle. It was also confirmed that heavy foreign matter such as sand remained on the bottom of the storage tank. From this result, it can be said that 400 L of spray liquid could be sprayed without clogging the pipes or spray nozzles in the spraying device, and without drawing up heavy foreign matter from the suction port.
In addition, the chicken farm workers' evaluation is positive because the chickens do not stop eating the feed even if they get caught in the feed. That's what it was.

(Comparative example 1)
Add 10 L of CNF dispersion (CNF concentration 2%, manufactured by Chuetsu Pulp Industries Co., Ltd., trade name: nanoforest-S Farm) and 390 L of water to the storage tank of the spraying device for the spray liquid containing fine fibers shown in Figure 1. It was made into a spray liquid. Figure 8 shows a portion of the spray liquid. From FIG. 8, the aggregates of CNF were not loosened, and the CNF remained sedimented, and could not be used as a spray liquid.

(Example 2)
In Example 1, after spraying 400 L of the spray liquid, the same operation was performed six times to spray a total of about 2800 L of the spray liquid. The time required for the spraying was 300 minutes. As in Example 1, when the spray nozzle and members were checked after spraying, no CNF was found to have adhered to the spray nozzle or the like. It was also confirmed that heavy foreign matter such as sand remained on the bottom of the storage tank. From this result, it can be said that approximately 2800 L of spray liquid could be sprayed without clogging the spray nozzle or sucking up heavy foreign matter from the suction port.

(Example 3)
A CNF dispersion (CNF concentration 1.57 wt%, manufactured by Chuetsu Pulp Industries Co., Ltd., product name: nanoforest-S Farm) was diluted with water to 0.1 wt%, and a power sprayer (manufactured by Koshinsha Co., Ltd., model number: ES-10P) was used. ) was connected to a spray nozzle (Super Jet I type, manufactured by Asaba Co., Ltd.) and a spray experiment was conducted. The conditions of the sprayer were medium pressure setting, approximately 5 L, and circulation was performed back to the tank.
Details of the spray nozzle are as follows.
This nozzle is equipped with a nozzle head, a 0.5m pipe, and a grip.The inside of the pipe has a brass core, and by turning the grip, the core moves back and forth within the nozzle head, separating the casing and core. It is a nozzle whose position can be changed, distance can be adjusted, and the spray can be stopped. Two spiral grooves are provided on the outer periphery of the tip of the core, and the fluid is supplied to the nozzle through these grooves and is ejected from the 2 mm diameter nozzle while constantly rotating. This nozzle can discharge 6.0L/min at wide angle and 7.5L/min at narrow angle at a supply pressure of 1.5MPa.
After spraying a predetermined amount, the nozzle was removed to check the internal condition, and the adhered CNF was collected, dried at 105°C for 12 hours or more, and the weight of the adhered substance was measured. In addition, the amount of spray was measured from the weight of the remaining liquid before and after the spray experiment, and the weight of deposits relative to the amount of spray was determined. Further, the same procedure was carried out for Examples 3 to 5 and Comparative Examples 2 and 3. The results are shown in Table 1.

(Example 4)
A CNF dispersion (CNF concentration 1.57 wt%, manufactured by Chuetsu Pulp Industries Co., Ltd., product name: nanoforest-S Farm) was diluted with water to 0.1% wt%, and then mixed with a power sprayer (manufactured by Koshinsha Co., Ltd., model number: ES). -10P) was connected to a spray nozzle (PA-284 for foam weed control manufactured by Koshinsha Co., Ltd.) and a spraying experiment was conducted. The conditions of the sprayer were medium pressure setting, approximately 5 L, and circulation was performed back to the tank.
Details of the spray nozzle are as follows.
This is a nozzle with one nozzle head, and the fluid passes through an 8mmφ opening and then is supplied to the nozzle head through a 1mmφ opening.There are two 1mmφ openings on the side of the nozzle head for taking in outside air, and from 1mmφ It becomes a bubble while taking in outside air under the supply pressure of , and is supplied to the injection port through a 5.3mmφ opening. The 2mm square nozzle inlet is further equipped with two 2.7mmφ openings, which are the final nozzles that spray after passing through these openings.

(Example 5)
A CNF dispersion (CNF concentration 1.57 wt%, manufactured by Chuetsu Pulp Industries Co., Ltd., product name: nanoforest-S Farm) was diluted with water to 0.1 wt%, and a power sprayer (manufactured by Koshinsha Co., Ltd., model number: ES-10P) was used. ) was connected to a spray nozzle (BigM, manufactured by Maruyama Seisakusho Co., Ltd.) and a spraying experiment was conducted. The conditions of the sprayer were medium pressure setting, approximately 5 L, and circulation was performed back to the tank.
Details of the spray nozzle are as follows.
This nozzle is equipped with a core that rotates inside the nozzle head.There are two spiral grooves along the outer shape of the rotating part, and the fluid passes through these grooves and is supplied to the 0.9mmφ nozzle. This is a nozzle with a rotating core. This nozzle can discharge 0.72L/min at a supply pressure of 1.5MPa, and the flow rate to the nozzle is small.

(Comparative example 2)
A CNF dispersion (CNF concentration 1.57 wt%, manufactured by Chuetsu Pulp Industries Co., Ltd., product name: nanoforest-S Farm) was diluted with water to 0.1 wt%, and a power sprayer (manufactured by Koshinsha Co., Ltd., model number: ES-10P) was used. ) was connected to a spray nozzle (vertical double-head PA-292 manufactured by Koshinsha Co., Ltd.) and a spray experiment was conducted. The conditions of the sprayer were medium pressure setting, approximately 5 L, and circulation was performed back to the tank.
Details of the spray nozzle are as follows.
A nozzle with two nozzle heads, equipped with a two-layer strainer inside, the fluid passes through an 8mm opening, is supplied to the two-layer strainer inside, and the first screen (round hole D: 0.5mmφ, P :1.2mm, 45° staggered punching plate with an aperture ratio of 27%), a nozzle that passes through the second mesh (four 1.6mmφ holes at the apex of a 4.5mm square on a side) and sprays from a 1.1mm nozzle. It is.

(Comparative example 3)
A CNF dispersion (CNF concentration 1.57 wt%, manufactured by Chuetsu Pulp Industries Co., Ltd., product name: nanoforest-S Farm) was diluted with water to 0.1% wt%, and then mixed with a power sprayer (manufactured by Koshinsha Co., Ltd., model number: ES). -10P) was connected to a spray nozzle (Superzoom P-700 manufactured by Yamaho Industries, Ltd.) and a spraying experiment was conducted. The conditions of the sprayer were medium pressure setting, approximately 5 L, and circulation was performed back to the tank.
Details of the spray nozzle are as follows.
It is a nozzle equipped with a nozzle head part, a pipe part of 1 m or more, and a grip. By turning the grip, the outlet in front of the nozzle head moves back and forth, allowing you to shorten or lengthen the distance between the nozzle and the spray angle from the nozzle. This nozzle moves back and forth within the casing, changing the position of the casing and core, making it possible to adjust distance and stop spraying. There are two linear grooves on the outer periphery of the tip of the core, and the fluid is supplied to the nozzle through these grooves and is ejected from the 2 mm diameter nozzle while constantly rotating. Two protrusions are placed on the side of the core. This nozzle can discharge 5.76L/min at wide angle and 7.17L/min at narrow angle with a supply pressure of 1.5MPa.

Comparative Example 2, which had a strainer screen inside the nozzle, resulted in a lot of internal adhesion. When the amount of spray per hour is small, the flow velocity in the pipe decreases and there is a tendency for adhesion to occur, but in Example 5, the amount of adhesion was suppressed. Between Example 3 and Comparative Example 3, which had a long introduction pipe to the nozzle and a handle that easily settled, Example 3 was better. From the results of Examples 3 and 5, the spray nozzle having a rotation mechanism can maintain a good spray state. Furthermore, if the flow rate is low, clogging tends to occur, but in Example 4, the agglomeration of CNF is suppressed by the air involved.
From the above, it has become clear that a foam nozzle with an outside air intake port and a spray nozzle with a rotating mechanism including a core with a spiral groove are suitable. It has also been found that the spiral shape of the groove in the turning guiding portion is better, and the wider the groove width is, the better.

Claims (5)

A spraying device that sprays a spray liquid containing fine fibers,
a storage tank comprising at least a spray liquid input port and a circulation return port;
a spray nozzle;
A power sprayer including a circulation port, a discharge port, and a water intake port;
circulation piping having one end connected to the circulation port and the other end connected to the circulation return port;
a discharge pipe having one end connected to the discharge port and the other end connected to the spray nozzle;
a water intake pipe whose one end is connected to the water intake port and whose other end is connected to the storage tank;
A member for maintaining a distance between the bottom surface of the storage tank and the suction port is provided at the suction port of the water suction pipe connected to the storage tank,
The spray nozzle is a spray nozzle having a rotation mechanism equipped with a core having a spiral groove, or a foam nozzle equipped with an outside air intake port,
A spraying device for a spray liquid containing fine fibers that circulates the spray liquid containing fine fibers in a storage tank using the power sprayer and circulation piping through the circulation return port. A spraying device that sprays a spray liquid containing fine fibers,
at least a storage tank comprising a spray liquid inlet;
a spray nozzle;
A power sprayer including a circulation port, a discharge port, and a water intake port;
a circulation pipe whose one end is connected to the circulation port and whose other end is connected to the spray liquid input port;
a discharge pipe having one end connected to the discharge port and the other end connected to the spray nozzle;
a water intake pipe whose one end is connected to the water intake port and whose other end is connected to the storage tank;
A member for maintaining a distance between the bottom surface of the storage tank and the suction port is provided at the suction port of the water suction pipe connected to the storage tank,
The spray nozzle is a spray nozzle having a rotation mechanism equipped with a core having a spiral groove, or a foam nozzle equipped with an outside air intake port,
A spraying device for a spraying liquid containing fine fibers, which circulates the spraying liquid containing fine fibers in a storage tank using the power sprayer and circulation piping through the spraying liquid input port. A first dilution step of preparing a first dilution by diluting a dispersion containing fine fibers with water in an amount of 5 to 10 times the volume of the dispersion;
a second dilution step of diluting the first diluent with water to obtain a spray liquid containing fine fibers at a predetermined concentration;
a circulation step of circulating the spray liquid containing the fine fibers using a storage tank, circulation piping, and a power sprayer;
A spraying method using a spraying device for spraying a spray liquid containing fine fibers, which comprises a spraying step of spraying to a predetermined location using a spray nozzle. a first dilution step of preparing a first diluted body by diluting a dispersion containing fine fibers with a concentration of fine fibers in the range of 0.1 to 15% with water;
The first diluent is diluted with water in an amount equal to or more than the first diluent to obtain a spray liquid containing fine fibers with a fine fiber concentration of 0.001 to 0.5%. a mixing step having a second dilution step;
a circulation step of circulating the spray liquid containing the fine fibers using a storage tank, circulation piping, and a power sprayer;
A spraying method using a spraying device for spraying a spray liquid containing fine fibers, which comprises a spraying step of spraying to a predetermined location using a spray nozzle. 5. The spreading method using the spraying device for a spraying liquid containing fine fibers according to claim 3 or 4, wherein the circulation step is performed by constantly circulating the spraying liquid containing fine fibers so that the spray liquid containing fine fibers is always in a fluid state.

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