JP2021133360A - Particulate matter spraying device and particulate matter spraying method - Google Patents

Abstract

To provide a technique that can spray particulate matter with good quantitativity.SOLUTION: When a maximum length in a transport direction MD of a particulate matter P ny transport means 3 at an outlet 23 is represented by D and a maximum length in a direction CD orthogonal to the transport direction MD at the outlet 23 is represented by W, W/D is 100 or less. Further, when a discharge amount of the particulate matter P from the outlet 23 per minute is represented by M and a target value of a spray amount of the particulate matter P by the transport means 3 per minute is represented by m, M/m is 1.5 or less. In addition, when a bulk density of the particulate matter P is represented by ρ, an area of the outlet 23 is represented by S, and a clearance between the outlet 23 and the transport means 3 is represented by G, m/(ρ×S×G) is 21/min or more.SELECTED DRAWING: Figure 4

Description

The present invention relates to a powder or granular material spraying device, a method for spraying powder or granular material using the powder or granular material spraying device, and a method for producing a powder or granular material-containing article or a functional article using the spraying method.

In the production of various products, it is required that the powder or granular material is uniformly sprayed over the width direction of the base material which is continuously transported. Regarding a technique for meeting such a demand, for example, Patent Document 1 describes an improved technique for a discharge portion structure of a powder or granular material storage tank for storing powder or granular material such as a cement raw material. The powder or granular material storage tank is configured such that a hopper with a narrowed tip is formed at the lower end of a tubular storage tank body at a predetermined gradient, and a discharge means such as a belt feeder is provided at a discharge port at the lower end of the hopper. ing. In the hopper, the area of the discharge port is smaller than the area of the introduction portion, the side wall between the storage tank main body and the discharge port is an inclined surface having a predetermined slope, and the powder stored in the storage tank main body. When the particles are gradually narrowed down to a smaller cross-sectional area and discharged, the powder particles are compressed from the side in the hopper, so that the powder particles are likely to be clogged, and the powder particles are easily clogged. There was a problem that it could not be discharged. The technique described in Patent Document 1 devises the aspect ratio of the discharge port in order to solve this problem. Specifically, the transport direction of the powder and granules by the discharge means is set to "MD" (Machine Direction). ), When the direction orthogonal to the MD is set to "CD" (Cross machine Direction), the magnitude relationship of "MD length of the discharge port> CD length of the discharge port" is established.

The applicant is first arranged with a gap between the hopper having the storage portion for the powder or granular material and the discharge port at the lower end of the hopper, and transports the powder or granular material discharged from the discharge port in one direction. Then, a powder or granular material spraying device provided with a transporting means for spraying on the base material was proposed (Patent Document 2). In the powder or granular material spraying device described in Patent Document 2, the MD / CD ratio of the discharge port is opposite to that described in Patent Document 1, “length of MD of discharge port <length of CD of discharge port”. In addition, the dimensions of each part of the hopper are set in a specific range in relation to the particle size of the powder or granular material. According to the powder or granular material spraying device described in Patent Document 2, the flow of the powder or granular material in the moving path for the powder or granular material provided in the device can be made steady and the fluidity of the powder or granular material can be improved. , The clogging of the powder or granular material is unlikely to occur in the moving path, and the powder or granular material can be sprayed quantitatively on the base material which is continuously transported.

Japanese Unexamined Patent Publication No. 2000-335682 Japanese Unexamined Patent Publication No. 2017-70944

The powder or granular material spraying device described in Patent Document 2 can spray the powder or granular material with high accuracy in a quantitative manner, but when the amount of the powder or granular material sprayed on the base material by the transport means is relatively large per unit time. , There is room for improvement.

An object of the present invention is to provide a technique capable of spraying powder or granular material with good quantitative property.

The present invention is for a storage unit capable of temporarily storing powder or granular material inside, a discharge port for discharging the powder or granular material in the storage unit, and a powder or granular material connecting the storage unit and the discharge port. A hopper provided with a moving path and a powder or granular material that is arranged at a predetermined distance from the discharge port and discharged from the discharge port by free drop due to its own weight are transported in a predetermined direction and continuously transported. It is a powder or granular material spraying device provided with a transport means for spraying on the substrate to be sprayed.
When the maximum length in the transport direction of the powder or granular material by the transport means at the discharge port is D and the maximum length in the direction orthogonal to the transport direction at the discharge port is W, the W / D is 100 or less. ,
When the amount of powder or granular material discharged from the discharge port per minute is M, and the target value of the amount of powder or granular material sprayed per minute by the transport means is m, M / m is 1.5 or more. can be,
In one embodiment of the powder or granular material spraying device of the present invention, when the bulk density of the powder or granular material is ρ, the area of the discharge port is S, and the separation distance between the discharge port and the transport means is G, m / It is a powder or granular material spraying device having (ρ × S × G) of 21 or more.

Further, the present invention is a method for spraying powder or granular material, which comprises a step of spraying the powder or granular material on a substrate that is continuously transported by using the above-mentioned powder or granular material spraying device of the present invention.
Further, the present invention is a method for producing a powder or granular material-containing article including a base material and powder or granular material arranged so as to be in contact with the base material.
This is a method for producing a powder or granular material-containing article, which comprises a step of spraying powder or granular material on a substrate that is continuously transported by using the powder or granular material spraying device of the present invention.

According to the present invention, it is possible to uniformly and quantitatively spray the powder or granular material on the base material to be continuously transported in the width direction (direction orthogonal to the transport direction) of the base material.

FIG. 1 is a side view schematically showing an embodiment of the powder or granular material spraying device of the present invention. FIG. 2 is a front view schematically showing a state in which the powder or granular material spraying device shown in FIG. 1 is viewed from the downstream side in the transport direction of the powder or granular material by the transport means. FIG. 3 is a perspective view of a hopper in the powder or granular material spraying device shown in FIG. FIG. 4 is a side view schematically showing a discharge port and its vicinity in the powder or granular material spraying device shown in FIG. 5 (a) and 5 (b) show the amount of change in the total mass per unit time (1 minute) based on the measured values of the hopper and the total mass of the powder or granular material stored in the hopper, respectively. It is a figure explaining the calculation method. 6 (a) and 6 (b) are side views schematically showing a main part (transporting means) of another embodiment of the powder or granular material spraying device of the present invention, respectively. 7 (a) and 7 (b) are plan views schematically showing the discharge port according to the powder or granular material spraying device of the present invention, respectively.

Hereinafter, the present invention will be described based on the preferred embodiment with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. The drawings are basically schematic, and the ratio of each dimension may differ from the actual one.

The powder or granular material spraying device of the present invention discharges a storage unit (indicated by reference numeral 20 in the figure) capable of temporarily storing powder or granular material (indicated by reference numeral P in the figure) and the powder or granular material in the storage unit. A hopper (indicated by reference numeral 2 in the figure) having a discharge port (indicated by reference numeral 23 in the figure) and a moving path for powder or granular material (indicated by reference numeral 22 in the figure) connecting the storage portion and the discharge port. ) Is provided.
In one embodiment of the powder or granular material spraying device of the present invention, a predetermined separation distance (indicated by reference numeral G in the figure) is provided with respect to the discharge port, and the powder or granular material is discharged from the discharge port by free fall due to its own weight. The powder or granular material is provided with a conveying means (indicated by reference numeral 3 in the figure) for conveying the powder or granular material in a predetermined direction (indicated by reference numeral MD in the figure) and spraying the powder or granular material on a substrate (indicated by reference numeral 100 in the figure) which is continuously conveyed. ..
1 to 4 show a powder or granular material spraying device 1 or a main part thereof, which is an embodiment of the powder or granular material spraying device of the present invention, and the powder or granular material spraying device 1 has the above-described configuration. ing.
The base material 100 and its transport device do not constitute the powder or granular material spraying device 1. The base material 100 is continuously conveyed by a known transfer device such as a transfer roll or a belt conveyor.

Hereinafter, the transport direction of the powder or granular material P by the transport means 3 is also referred to as “MD” (Machine Direction), and the direction orthogonal to MD is also referred to as “CD” (Cross machine Direction) or “width direction”.

The hopper 2 is connected to a storage portion 20 having a trapezoidal shape in which the upper base is longer than the lower base and the lower end of the storage portion 20 when viewed from the side view as shown in FIG. It is configured to include a rectangular parallelepiped discharge portion 21 having a rectangular shape in view.
The storage unit 20 has a space inside which the powder or granular material P can be stored, and the powder or granular material P can be temporarily stored in the internal space. The powder or granular material P is supplied to the internal space of the storage unit 20 by the powder supply device 90 from the upper opening of the storage unit 20.
The discharge unit 21 has a moving path 22 for the powder or granular material P inside. A discharge port 23 for the powder or granular material P is formed at the lower end of the discharge section 21 (the end opposite to the storage section 20 side), and the internal space of the storage section 20 and the discharge port 23 are in a moving path 22. Communicate through.
With such a configuration, the hopper 2 is capable of discharging the powder or granular material P temporarily stored inside the storage unit 20 from the discharge port 23 via the moving path 22.

In the present embodiment, in the storage unit 20 that constitutes the upper portion of the hopper 2 and has an internal space in which the powder and granules P are stored, as shown in FIG. 3, the side wall of the storage unit 20 that defines the internal space. A part of the inner surface 20i is an inclined inner surface 20is that intersects both the horizontal direction and the vertical direction (more specifically, the vertical direction) orthogonal to the horizontal direction, and the remaining part of the inner surface 20i is the vertical direction (more specifically). Specifically, it extends in the vertical direction). The inclined side wall 20s having the inclined inner surface 20is is located on one side of the MD, more specifically, on the downstream side of the MD. The inner surface 20i of the storage unit 20 is connected to the inner surface 21i of the side wall of the discharge unit 21 that defines the moving path 22. Since the inner surface of the hopper 2 is configured in this way, when the aggregate of the powder or granular material P flows from the storage portion 20 to the discharge portion 21, the central portion in the direction orthogonal to the flow direction of the aggregate is around. Since it is suppressed that the flow velocity is higher than that of the portion, it is advantageous for uniform spraying of the powder or granular material P.

Further, in the present embodiment, in the discharge portion 21 which constitutes the lower part of the hopper 2 and has the movement path 22 of the powder or granular material P inside, as shown in FIG. 3, the side wall of the discharge portion 21 which defines the movement path 22. All of them are vertical walls extending in the vertical direction (more specifically, in the vertical direction), and all of the inner surfaces 21i of the side wall also extend in the same direction. That is, the MD length D and the CD length W of the internal space (moving path 22 and discharge port 23) of the discharge unit 21 are in the height direction of the discharge unit 21 (discharge direction of the powder or granular material P), respectively. It is constant over the entire length.

As described above, in the present embodiment, the upper portion (storage portion 20) of the hopper 2 in the height direction has the area of the cross section (cross section) along the horizontal direction of the internal space of the upper portion from the upper side to the lower side in the height direction. The lower part of the hopper 2 in the height direction (discharging portion 21) gradually decreases toward It is constant. Since the hopper 2 has such a structure, the powder or granular material P can be stably quantitatively discharged from the discharge port 23.

In the present embodiment, as shown in FIG. 1, the transport means 3 includes a receiving means (trough) 30 for receiving the powder or granular material P discharged from the hopper 2 and a vibration generating means 31 for vibrating the receiving means 30. It is composed of.
The transport means 3 is arranged with a predetermined distance G from the discharge port 23 located at the lower end of the hopper 2, and more specifically, receives the powder or granular material P discharged from the hopper 2. It is arranged so that a gap of a separation distance G is formed between the upper surface 30a of the receiving means 30 to be conveyed and the discharge port 23.
The vibration generating means 31 is fixed to the lower surface 30b of the receiving means 30. In the receiving means 30, what is used for receiving and transporting the powder or granular material P (contacting with the powder or granular material P) is the portion located below the hopper 2 (discharge port 23) and its vicinity, and other than that. Is basically a non-contact portion of the powder or granular material that does not come into contact with the powder or granular material P, and the vibration generating means 31 is fixed to the lower surface 30b of the non-contact portion of the powder or granular material 30 of the receiving means 30.

The transporting means 3 is made capable of transporting the powder or granular material P on the receiving means 30 in a predetermined direction by operating the vibration generating means 31 to vibrate the receiving means 30.
As shown in FIG. 1, the powder or granular material spraying device 1 includes a control means 4 for controlling the voltage and / or frequency applied to the vibration generating means 31, and the frequency of the receiving means 30 is controlled by the control means 4. And / or the amplitude is controlled, and thus the transport state of the powder or granular material P on the receiving means 30 is controlled. That is, under the control of the control means 4, when the vibration generating means 31 is not operating, the receiving means 30 does not vibrate, so that the transport of the powder or granular material P on the receiving means 30 is stopped or suppressed. When the vibration generating means 31 is operated from such a state, the receiving means 30 starts the vibration, so that the stop or suppression of the powder or granular material P on the receiving means 30 is released, and the powder or granular material P is conveyed to the MD. Finally, as shown in FIGS. 1 and 2, the receiving means 30 freely falls from the downstream end 3DE of the MD due to its own weight, and is continuously conveyed under the receiving means 30 onto the base material 100. It is sprayed.

From the viewpoint of appropriately transmitting the vibration generated by the vibration generating means 31 to the powder or granular material P on the receiving means 30, the receiving means 30 is preferably flat, and more specifically, FIG. A flat flat plate member as shown in is preferable. Further, from the viewpoint of uniformly spraying the powder or granular material P discharged from the discharge port 23 on the MD of the receiving means 30 from the tip portion, in order to prevent spraying from other than the MD, the side surface of the receiving means 30 A guide may be provided. The material of the receiving means 30 made of such a flat plate member is not particularly limited, and examples thereof include various plastics and various metals.

The vibration generating means 31 may be any as long as it can generate a vibration component capable of transporting the powder or granular material P on the receiving means 30 in a desired direction. For example, a piezoelectric element such as a piezoelectric ceramic, a vibration feeder, or the like. Known vibration generating means can be mentioned. Among them, the vibration feeder is preferably used as the vibration generating means 31. The frequency of the vibration generating means 31 is not particularly limited, but is preferably 50 Hz or higher, more preferably 100 Hz or higher, and preferably 100 Hz or higher, from the viewpoint of transportability of powders and granules, uniformity of spraying, and quantitativeness. Is 500 Hz or less, more preferably 300 Hz or less.

As shown in FIG. 1, a weighing device 5 is attached to the hopper 2. As the measuring device 5, a device capable of continuously measuring the total mass of the hopper 2 and the powder or granular material P stored in the hopper 2 is used. Continuously measurable means that the sampling time of the measurement data is more than 0 seconds and 1 second or less. The measurement data of the total mass of the hopper 2 and the powder or granular material P stored in the hopper 2 measured by the measuring device 5 is transmitted to the control means 4 described above each time the data is acquired. It has become. A specific example of the measuring device 5 is an electric measuring instrument, and specifically, a load cell type measuring instrument, an electromagnetic measuring instrument, a tuning fork type measuring instrument, or the like can be used.

As described above, the control means 4 has a function of controlling the frequency and / or amplitude of the receiving means 30. Further, the control means 4 can receive the measurement data transmitted from the measurement device 5. Further, the control means 4 is connected to the powder supply device 90 installed on the storage unit 20 of the hopper 2, and has a function of controlling the supply of the powder or granular material P into the storage unit 20. As the control means 4, for example, a computer on which control / processing software is installed can be used.

Examples of the powder or granular material P to be sprayed using the powder or granular material spraying device 1 include water-absorbent polymer particles, sugar, activated charcoal, wheat flour, polyethylene pellets, polypropylene pellets, polyethylene terephthalate chips, polycarbonate chips, polyethylene granules, and the like. Examples thereof include organic powders and granules such as butyl polyacrylate beads and inorganic powders and granules such as metal powder, sodium chloride, potassium chloride, calcium chloride, magnesium chloride, glass and lime. The shape of the powder or granular material P is not particularly limited, and examples thereof include a spherical shape, a gostone shape, an elliptical shape, an elliptical pillar shape, a needle shape, and a cubic shape. According to the powder / granular material spraying device 1, not only when the powder / granular material P is spherical, but also when the powder / granular material P has a shape other than the true spherical shape, it is uniform in the longitudinal direction (that is, MD) and / or CD of the base material 100. Can be sprayed quantitatively.

The base material 100 is preferably a sheet-shaped base material, but is not limited to the sheet-shaped base material. Examples of the sheet-like base material include non-woven fabrics, resin films, woven fabrics, knitting, paper, etc. produced by various manufacturing methods, and laminates in which a plurality of the same or different kinds of these are laminated.

The powder or granular material spraying device 1 can be suitably used in a method for spraying powder or granular material, which comprises a step of spraying the powder or granular material on a substrate that is continuously conveyed.
Further, the powder or granular material spraying device 1 is a method for producing a powder or granular material-containing article including a base material and powder or granular material arranged so as to be in contact with the base material, and is a method for producing a powder or granular material-containing article, which is continuously conveyed to the base material. On the other hand, it can be suitably used in a method for producing a powder or granular material-containing article, which comprises a step of spraying the powder or granular material. When the powder or granular material is a functional powder or granular material having some functionality, the powder or granular material-containing article containing the functional powder or granular material is a functional article. Specific examples of the functional powder or granular material include particles of a water-absorbent polymer and an electrolyte such as sodium chloride.
According to the powder or granular material spraying device 1, even in a functional article in which the base material is continuously transported at high speed and the amount of spraying on the base material is large per unit area, the base material is in the longitudinal direction (that is, MD) and the CD. Can be sprayed uniformly and quantitatively. A functional article that is sprayed in a large amount is typically an absorbent sheet described later.

An example of the functional article is a heating element. For example, a sheet-shaped heating element (heating sheet) can be produced by spraying a water-absorbent polymer or an electrolyte as powders or granules on a substrate that is continuously transported using the powder or granular material spraying device 1. With the heat generating sheet manufactured in this way, it can be expected that excellent heat generation characteristics with less heat generation unevenness can be obtained. In such a method for producing a heat-generating sheet, as the base material, for example, a fiber sheet and a heat-generating composition provided on one side of the fiber sheet and containing an oxidizable metal and water can be used. In that case, the powder or granular material is sprayed on the surface of the fiber sheet to which the heat-generating composition is applied.

Another example of the functional article is an absorber. For example, by spraying a water-absorbent polymer as powder or granular material on a fiber sheet (base material) such as paper or non-woven fabric that is continuously conveyed, the water-absorbent polymer is sprayed as powder or granular material on one surface of the fiber sheet. A sheet-like absorber (absorbent sheet) having a structure in which a polymer is sprayed can be produced. Such absorbent sheets are suitable as absorbents in absorbent articles such as disposable diapers and sanitary napkins.

When the powder or granular material P is sprayed on the sheet-shaped base material 100 that is continuously transported by using the powder or granular material spraying device 1, the powder stored in the hopper 2 through the discharge port 23 in the hopper 2. The granular material P is freely dropped by its own weight and sprayed on the receiving means 30 of the transporting means 3. As the powder or granular material P falls, the amount of the powder or granular material P stored in the hopper 2 gradually decreases. The amount of the powder or granular material P in the hopper 2 is continuously measured by the measuring device 5 in the form of the total mass of the powder or granular material P stored in the hopper 2 and the hopper 2. In the following description, for the sake of simplicity, the total mass of the hopper 2 and the powder or granular material P stored in the hopper 2 is also referred to as "the mass of the powder or granular material including the hopper". Prior to the continuous measurement of the hopper-containing powder or granular material mass A, it is preferable to measure _{the hopper-containing powder or granular material mass A 1} in a fully filled state of the powder or granular material P in advance. By previously measuring a hopper included granular mass A ₁ in a fully filled state of the powder particles P, the weight A _P of the particulate material P dropped from the hopper 2, facilitates the calculation of A 1 _-A Can be calculated.

In order to stably and quantitatively spray the powder or granular material P on the sheet-shaped base material 100, the powder or granular material P that has fallen on the receiving means 30 in the transporting means 3 is sprayed on the base material 100 in a quantitative manner. Therefore, it is desirable to control the amplitude and frequency of the receiving means 30. The amplitude and frequency of the receiving means 30 are controlled by the vibration generating means 31. Specifically, the vibration control by the vibration generating means 31 is preferably performed according to the following criteria. That is, the hopper-containing powder and granule mass A is continuously measured, and the amount of change ΔA of the hopper-containing powder and granule mass A per unit time is calculated. ΔA is _{defined as (A a-} A _b ) / t. A _a is the mass of the hopper-containing powder and granules at a certain time, and A _b is the mass of the hopper-containing powder and granule after the lapse of time t. ΔA is calculated by the control means 4. Since the mass of the hopper 2 is invariant, ΔA is equal to the rate of decrease in the mass of the powder or granular material P in the hopper 2. The control means 4 controls the transport capacity of the transport means 3 according to the mass reduction rate ΔA, and determines the spray amount M1 of the powder or granular material P sprayed on the base material 100 by the transport means 3 per unit time. , Perform a transport capacity control operation to match the target spray amount m per unit time. In the transport capacity control operation, for example, when ΔA is less than the target spray amount m, the transport capacity of the transport means 3 is increased to increase the spray amount M1. On the contrary, when ΔA is larger than the target spraying amount m, the transporting capacity of the transporting means 3 is lowered to reduce the spraying amount M1.

In this way, the control means 4 measures the amount of change (mass reduction rate) ΔA per unit time (for example, 1 minute) of the powder or granular material mass A including the hopper, and the unit time of the powder or granular material P by the transport means 3. The spray amount per (for example, 1 minute) M (measured value of the spray amount) M matches the target value m of the spray amount per unit time (for example, 1 minute) of the powder or granular material P by the transport means 3. The transport capacity of the transport means 3 is controlled according to the amount of change ΔA.
The transport capacity of the transport means 3 can be changed, for example, by controlling the amplitude or frequency of the vibration of the vibration generating means 31 or both. For the control of the vibration generating means 31, for example, a known feedback control method such as P control (proportional control), PI control or PID control can be adopted. The coefficients in these various control methods can be determined by trial and error.

The mass reduction rate ΔA of the mass of the powder and granules including the hopper can be calculated by various methods. For example, the mass of the hopper-containing powder and granules is measured every t (seconds) for a predetermined time, and the difference between the weighed hopper-containing powder and granule mass and the hopper-containing powder and granule mass measured before t (seconds) is calculated. Then, the value obtained by dividing the value by t (seconds) can be defined as the mass reduction rate ΔA. The value of t is preferably 1 second or more and 300 seconds or less. As an example, as shown in FIG. 5A, the mass of powder and granules including the hopper is measured every 5 seconds, the difference between the latest measured value and the measured value 5 seconds ago is taken, and the difference is taken in 5 seconds. By dividing, the mass reduction rate ΔA can be calculated.

Alternatively, the mass of the hopper-containing powder and granules was weighed every predetermined time s (seconds), and the weighed mass of the hopper-containing powder and granules was weighed before t (seconds) (where s ≦ t). It is also possible to calculate the difference from the mass of the powder and granules including the hopper, and divide the value by t (seconds) to define the mass reduction rate ΔA. Regarding the relationship between s and t, it is preferable that the value of t / s is 1 or more and 3000 or less. The value of s is preferably 0.1 seconds or more and 10 seconds or less. The value of t is preferably 1 second or more and 300 seconds or less, provided that it is larger than the value of s. As an example, as shown in FIG. 5 (b), the mass of the powder and granules including the hopper is measured every second, the difference between the latest measured value and the measured value 5 seconds ago is taken, and the difference is taken in 5 seconds. By dividing, the mass reduction rate ΔA can be calculated.

The method for calculating the mass reduction rate ΔA shown in FIG. 5A has an advantage that the calculation load on the control means 40 is smaller than the method for calculating the mass reduction rate ΔA shown in FIG. 5B. On the other hand, the method for calculating the mass reduction rate ΔA shown in FIG. 5B has an advantage that the mass reduction rate ΔA can be calculated more accurately than the method for calculating the mass reduction rate ΔA shown in FIG. 5A.

The target spraying amount m of the powder or granular material P by the transporting means 3 per minute is preferably 1 g / min or more, more preferably 50 g / min or more, still more preferably 50 g / min or more, from the viewpoint that the effect of the present invention becomes remarkable. It is 100 g / min or more.
Further, from the viewpoint of ease of handling, it is preferably 100,000 g / min or less, more preferably 10,000 g / min or less, and further preferably 5000 g / min or less.
By the way, one of the main problems of the powder or granular material spraying device 1 is to enable the powder or granular material P to be quantitatively sprayed with high accuracy on the base material 100 which is continuously transported, and in order to make this possible. , The following (i) and (ii) are adopted in the powder or granular material spraying device 1.
(i) When the maximum length of MD at the discharge port 23 is D and the maximum length of CD at the discharge port 23 is W, W / D is 100 or less (W / D ≦ 100).
(ii) The amount of powder or granular material P discharged from the discharge port 23 per unit time, specifically, the amount of powder or granular material P discharged per minute is M, and the target of the amount of powder or granular material P sprayed per minute by the transport means 3 When the value is m, M / m is 1.5 or more (M / m ≧ 1.5).
The units of W / D and M / m are dimensionless, respectively.

Regarding (i), the plan-view shape of the discharge port 23 located at the lower end of the discharge unit 21 has a considerable influence on the flow of the powder or granular material P in the moving path 22 in the discharge unit 21. According to the findings of the present inventor, if the W / D value is relatively small, that is, the plan-view shape of the discharge port 23 is short for CD and long for MD, and the difference between the two is relatively small, the movement is performed. The external force (shearing force or frictional force) applied to the powder or granular material P in the road 22 can be reduced, and the flow of the powder or granular material P in the moving path 22 can be made uniform. Such a tendency is particularly remarkable when the target spraying amount m per minute is relatively large, and a large amount of powder or granular material P is applied to the base material 100 at a setting where the W / D value is relatively large. When spraying is attempted, inconveniences such as uneven spraying amount of the powder or granular material P on the CD of the base material 100 are likely to occur, and in the worst case, the moving path 22 or the discharge port 23 is blocked by the powder or granular material P. It may lead to poor discharge. In consideration of the above, the magnitude relationship of the above-mentioned "W / D ≦ 100" was adopted to prevent the occurrence of inconvenience.

The W / D is at least 100 or less, preferably 80 or less, and more preferably 40 or less. The lower limit of the W / D is preferably 1 or more, more preferably 10 or more, still more preferably 13 or more, from the viewpoint of making the amount of powder or granular material P sprayed uniformly on the CD.

In the present embodiment, the discharge port 23 has a long shape like a CD in a plan view. Specifically, as shown in FIG. 3, the discharge port 23 has a rectangular shape, and its longitudinal direction coincides with the CD. That is, in the present embodiment, the W / D exceeds 1. The shape of the cross section (cross section) of the moving path 22 along the horizontal direction is also a rectangular shape like the plan view shape of the discharge port 23.

The maximum lengths D and W of the discharge port 23 may be appropriately adjusted according to the physical characteristics (particle size, bulk density, etc.) of the powder or granular material P, the target spraying amount m, and the like, and are not particularly limited. For example, when the powder or granular material P having a maximum particle diameter r of 1 mm and a bulk density ρ of 1 g / cm ³ is sprayed so that the target spray amount m per minute is 10 to 100 g / min, the maximum length. D and W can be set as follows with reference to the maximum particle size r of the powder or granular material P, respectively.
The ratio [D / r] of the maximum length D of the discharge port 23 to the maximum particle size r of the powder or granular material P is preferably 2 or more, more preferably 6 or more, and preferably 30 or less, more preferably 18. Less than.
The ratio [W / r] of the maximum length W of the discharge port 23 to the maximum particle size r of the powder or granular material P is preferably 3 or more, more preferably 50 or more, and preferably 1000 or less, more preferably 200. It is as follows.
The units of D / r and W / r are dimensionless, respectively.

The maximum length of the MD in the moving path 22 can be set to be the same as the maximum length D of the discharging port 23, and the maximum length of the CD in the moving path 22 is the maximum length W of the discharging port 23. Can be set to the same.

The maximum particle size r of the powder or granular material P can be measured by a known method. Specifically, for example, dry sieving method (JIS Z8815: 1994), dynamic light scattering method, laser diffraction method, centrifugal sedimentation method, gravity sedimentation method, image imaging method, FFF (field flow fractionation) method, Examples include the electrostatic detector method and the Coulter method. Among these, it is preferable to adopt the maximum particle size r measured by the laser diffraction method or the Coulter method from the viewpoint of reproducibility and accuracy. When the particle size of the target powder or granular material is about 5 mm or less, it is preferable to measure the maximum particle size r of the powder or granular material by using a laser diffraction method.

Regarding (ii), the fact that the magnitude relationship of "M / m ≥ 1.5" is established means that the mass of the powder or granular material P discharged from the discharge port 23 by free fall due to its own weight in a unit time (1 minute). (Discharge amount M) is 1.5 times or more the mass (target spray amount m) of the powder or granular material P to be sprayed from the transport means 3 to the base material 100 in the same unit time (1 minute). Means.
For example, when the discharge amount M from the discharge port 23 decreases due to the flow of the powder or granular material P in the moving path 22 becoming non-uniform, the change amount ΔA by the control means 4 is changed as described above. The transport capacity of the transport means 3 is controlled accordingly. Specifically, for example, by increasing the vibration amplitude and / or frequency of the vibration generating means 31 under the control of the control means 4, the amount of powder or granular material P sprayed on the base material 100 per unit time (1 minute) M1 Try to increase. Here, when the relationship of M / m ≧ 1.5 is established, a sufficiently large amount of powder or granular material P is discharged to the transporting means 3 with respect to the target spraying amount m, so that the transporting means It is possible to secure a time margin for adjusting the discharge amount M from the discharge port 23 only by controlling the transport capacity of 3. As described above, the phenomenon that the flow of the powder or granular material P in the moving path 22 becomes non-uniform is likely to occur especially when the target spraying amount m is relatively large, so that the magnitude of M / m ≧ 1.5 is large or small. It can be said that the establishment of a relationship is particularly effective in such a case.

The M / m is at least 1.5 or more, preferably 2 or more, and more preferably 3 or more. The upper limit of M / m is preferably 80 or less, more preferably 8 or less, from the viewpoint of making the flow of the powder or granular material P in the moving path 22 even more uniform.

The adjustment of M / m can be carried out by appropriately adjusting the discharge amount M per unit time (1 minute) of the powder or granular material P from the discharge port 23 with respect to the arbitrarily set target spray amount m. Further, the discharge amount M can be adjusted by appropriately adjusting the plan-view shape and dimensions (maximum lengths D and W) of the discharge port 23. This is because the powder or granular material P is discharged from the discharge port 23 by free fall due to its own weight, and therefore the discharge amount M per unit time (1 minute) largely depends on the shape and dimensions of the discharge port 23.

As described above, both (i) and (ii) are adopted so as to be able to cope with the case where the spray amount (target spray amount m) per unit time (1 minute) of the powder or granular material P is relatively large. And is closely related to the outlet 23. Then, by configuring the discharge port 23 so as to satisfy the above (i) and (ii), even if the amount of the powder or granular material P sprayed per unit time (1 minute) is relatively large, the base material 100 is used. On the other hand, it can be expected that the powder or granular material P can be uniformly and quantitatively sprayed on the CD.

As a result of various studies by the present inventor, it has been found that when the target spraying amount m is relatively large, it is preferable to satisfy the following (iii) in addition to the above (i) and (ii). That is, as shown in FIG. 4, when the discharge port 23 is virtually extended toward the transport means 3 (upper surface 30a of the receiving means 30), it is formed in the gap between the discharge port 23 and the transport means 3. It was found that it is important that the virtual extension region 23V of the discharge port 23 is within a specific range in relation to the target spray amount m.
(iii) When the bulk density of the powder or granular material P is ρ, the area of the discharge port 23 is S, and the distance between the discharge port 23 and the transport means 3 is G, m / (ρ × S × G) is 21 /. It is min or more [m / (ρ × S × G) ≧ 20]. The unit of m / (ρ × S × G) is [/ min].

Regarding (iii), ρ × S × G corresponds to the mass of the powder or granular material P having the same volume as the volume of the virtual extension region 23V (see FIG. 4). According to the findings of the present inventor, when the volume of the virtual extension region 23V becomes large or the target spraying amount m becomes small, the spraying accuracy of the powder or granular material P on the base material 100 tends to decrease. In consideration of such a tendency, the above-mentioned magnitude relationship of "m / (ρ × S × G) ≧ 20" was derived as a result of various studies. When m / (ρ × S × G) is 21 / min or more, the predetermined effect of the present invention is exhibited by the synergistic effect with (i) and (ii). That is, in order to make the flow of the powder or granular material P steady in the moving path 22 and improve the fluidity of the powder or granular material P, the amount of the powder or granular material P sprayed per unit time (1 minute) (target spraying amount m). Even when the amount of powder or granular material P is relatively large, or when the powder or granular material P is not spherical or the particle size distribution is relatively wide, clogging of the powder or granular material P is unlikely to occur, and the substrate 100 is continuously transported. In both MD (longitudinal direction of the base material 100) and CD (width direction of the base material 100), the powder or granular material P can be uniformly and highly accurately quantitatively sprayed.

The m / (ρ × S × G) is at least 21 / min or more, preferably 30 / min or more, more preferably 50 / min or more, and further preferably 100 / min or more. The upper limit of m / (ρ × S × G) is preferably 1000 / min or less, more preferably 800 / min, from the viewpoint of making the flow of the powder or granular material P on the transport means 3 even more uniform. It is min or less, more preferably 650 / min or less.

The bulk density ρ of the powder or granular material P can be measured by a known method. The bulk density ρ according to the present invention is the density when the powder or granular material P is filled in a container having a constant volume and the internal volume of the container is defined as the filling volume of the powder or granular material P. Specific examples of the available measurement methods include, for example, measurement methods according to JISZ2504: 2012 and JISZ2512: 2012.
The adjustment of m / (ρ × S × G) is performed by adjusting the area S of the discharge port 23 and / or the discharge port 23 with respect to the target spray amount m arbitrarily set and the bulk density ρ of the powder or granular material P which is an eigenvalue. It can be carried out by appropriately adjusting the separation distance G between the and the transport means 3 with reference to the maximum particle diameter r of the powder or granular material P.
The ratio [S / (r × r)] of the area S of the discharge port 23 to the square value of the maximum particle size r of the powder or granular material P is preferably 4 or more, more preferably 1000 or more, and preferably 5000 or less. , More preferably 1100 or less. The unit of S / (r × r) is dimensionless.
The ratio [G / r] of the separation distance G to the maximum particle size r of the powder or granular material P is preferably 1 or more, more preferably 3 or more, still more preferably 5 or more, and preferably 20 or less, more preferably 20 or less. It is 10 or less. The unit of G / r is dimensionless.

When the spray amount (target spray amount m) per unit time (1 minute) of the powder or granular material P increases, the flow of the powder or granular material P tends to be uneven inside the hopper 2 such as the moving path 22. However, it is presumed that this is due to an increase in the external force (shearing force or frictional force) applied to the powder or granular material P in the hopper 2. Further, the external force applied to the powder or granular material P in the hopper 2 is closely related to ^{m / (ρ × (D / r) 2).} Therefore, by appropriately controlling this "m / (ρ × (D / r) ² )", the CD of the base material 100 is combined with the action and effect of satisfying the above (i) to (iii). It becomes possible to more reliably spray the powder or granular material P uniformly and quantitatively. The unit of m / (ρ × (D / r) ² ) is [mm ³ / min].
Regarding the upper limit of m / (ρ × (D / r) ² ), the inconvenience that the powder or granular material P is moored on the inner surface 21i of the side wall of the discharge portion 21 defining the moving path 22 is mainly prevented. From the viewpoint of making the flow of the powder or granular material P uniform, it is preferably 100,000 mm ³ / min or less, and more preferably 80,000 mm ³ / min or less.
Regarding the lower limit of m / (ρ × (D / r) ² ), it is preferable from the viewpoint of making the flow of the powder or granular material P uniform mainly by preventing the flow of the powder or granular material P from being disturbed. 1500 mm ³ / min or more, more preferably 30,000 mm ³ / min or more.
The adjustment of m / (ρ × (D / r) ² ) is performed at the discharge port 23 (moving path 22) with respect to the arbitrarily set target spray amount m and the bulk density ρ of the powder or granular material P which is an eigenvalue. This can be carried out by appropriately adjusting the maximum length D of the MD.

From the viewpoint of uniformly and quantitatively spraying the powder or granular material P on the CD of the base material 100, the ratio of the maximum length D of the MD at the discharge port 23 to the maximum particle size r (see FIG. 4) of the powder or granular material P. That is, D / r is preferably 2 or more, more preferably 6 or more. That is, it is preferable that "2 ≦ D / r" is satisfied. With such a configuration, it is possible to effectively prevent clogging of the powder or granular material P at the discharge port 23. The upper limit of D / r is preferably 30 times or less, more preferably 15 times or less, from the viewpoint of making the flow of the powder or granular material P uniform in the moving path 22.

From the viewpoint of uniformly and quantitatively spraying the powder or granular material P on the CD of the base material 100, the length H (see FIGS. 2 and 3) of the powder or granular material P in the discharge direction of the moving path 22 is the powder or granular material P. It is also preferable that the maximum particle size r is 1 times or more (1 ≦ H / r). With such a configuration, it is possible to effectively prevent the clogging of the powder or granular material P in the moving path 22, and the powder or granular material P can be uniformly and quantitatively sprayed on the CD with respect to the base material 100. The ratio of the length H of the moving path 22 to the maximum particle size r of the powder or granular material P, that is, H / r is preferably 5 or more, more preferably 10 or more. The upper limit of the length H of the moving path 22 is not limited from the viewpoint of steady flow of the powder or granular material P, but can be determined from the viewpoint of the appropriate size of the apparatus, for example, H / The upper limit of r is preferably 100 or less.

From the viewpoint of steady flow of the powder or granular material P in the hopper 2 and further improvement of the fluidity, the angle θ1 (see FIG. 1) with respect to the horizontal direction of the inner surface of the hopper 2 in contact with the powder or granular material P is the powder. It is preferable that the angle of repose θ (see FIG. 4) or more of the granular material P or more. When the inner surface of the hopper 2 in contact with the powder or granular material P is an inclined inner surface that intersects both the horizontal direction and the vertical direction, such as the inclined inner surface 20is, the angle θ1 with respect to the horizontal direction of the inner surface is on the acute angle side. Refers to the angle.
In the present embodiment, as shown in FIG. 3, all the side walls of the hopper 2 (storage unit 20 and discharge unit 21) are in the vertical direction orthogonal to the horizontal direction except for the inclined side wall 20s of the storage unit 20 having the inclined inner surface 20is. It is a vertical wall extending in the vertical direction (more specifically, in the vertical direction), and the angles θ1 of the inner surfaces 20i and 21i of the vertical walls with respect to the horizontal direction are 90 °, which is larger than the angle of repose θ of the powder and granule P, and also. The angle θ1 of the inclined inner surface 20is with respect to the horizontal direction is the same as or larger than the angle of repose θ of the powder granules P.
The ratio of the angle θ1 of the inner surface in contact with the powder or granular material P in the hopper 2 to the horizontal direction and the angle of repose θ of the powder or granular material P is preferably 1.2 or more, more preferably 1.5 or more, as θ1 / θ. Is. θ1 is preferably 1.2θ or more and 90 ° or less, and more preferably 1.5θ or more and 90 ° or less.

From the viewpoint of stably improving the spraying accuracy of the powder or granular material P on the base material 100, as shown in FIG. 4, the virtual straight line VL extending in the vertical direction (vertical direction) through the center of the discharge port 23 and the transport means 3 ( The intersection 23A with the upper surface 30a) of the receiving means 30 is in a range of G / tan θ or more and 15 G or less from the downstream end 3DE of the MD in the transporting means 3 in relation to the separation distance G and the angle of repose θ of the powder or granular material P. It is preferably located. In other words, the separation distance L between the downstream end 3DE of the transport means 3 (reception means 30) and the intersection 23A is preferably G / tan θ or more and 15 G or less. The shorter the separation distance L is, the more preferable it is in terms of the spraying accuracy of the powder or granular material P. However, if the separation distance L is too short, the powder or granular material P discharged from the discharge port 23 does not come into contact with the transport means 3. There is a risk that it will be sprayed directly onto the base material 100 located below it, which may hinder the stable improvement of spraying accuracy. The separation distance L is more preferably G / tan θ or more and 10 G or less.

FIG. 6 shows the main parts of other embodiments of the powder or granular material spraying device of the present invention. Regarding other embodiments described later, components different from those of the powder or granular material spraying device 1 will be mainly described, and similar components will be designated by the same reference numerals and description thereof will be omitted. The description of the powder or granular material spraying device 1 is appropriately applied to the components not particularly described.

The powder / granular material spraying devices 1A and 1B shown in FIG. 6 have different transport means from the powder / granular material spraying device 1.
The transporting means 3A in the powder or granular material spraying device 1A shown in FIG. 6A is arranged below the discharge port 23 of the hopper 2 and includes a cylindrical transport roll 32 that rotates around a rotation axis. , The powder or granular material P discharged from the discharge port 23 is received on the outer peripheral surface of the transport roll 32, and is directed toward the base material (not shown) located below the transport roll 32 by the rotation of the transport roll 32 from the receiving position. It is designed to be dropped and sprayed on the base material.
The transport means 3B in the powder or granular material spraying device 1B shown in FIG. 6B includes a drive roll 33 and an endless transport belt 35 bridged to the driven roll 34, and is discharged from the discharge port 23. The powder or granular material P is received by the transport belt 35, and by moving the transport belt 35 from the receiving position, the powder or granular material P is dropped toward a base material (not shown) located below the transport belt 35 and sprayed on the base material. It is made to do.

Although the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above-described embodiment and can be appropriately modified without departing from the spirit of the present invention.
For example, the plan-view shape of the discharge port 23 in the discharge portion 21 of the hopper 2 is not limited to the rectangular shape as shown in FIG. 3, and can be arbitrarily set to a circular shape, an elliptical shape, a polygonal shape, or the like. It can be an oblong shape as shown in 7 (a) or a polygonal shape that is longer than a pentagon as shown in FIG. 7 (b). However, as described above, the plan view shape of the discharge port 23 is preferably a "long shape in one direction" such that the maximum length of the CD is longer than the maximum length of the MD, and the discharge port 23 shown in the figure. All of these are specific examples.
Further, the discharge port 23 may be divided into a plurality of sections by the CD, and the discharge section 21 may have a plurality of movement paths 22 corresponding to the plurality of sections on a one-to-one basis. In that case, the plurality of movement paths may be provided. The above-mentioned description regarding the moving path 22 is applied to each of the 22 (exhaust ports 23).
The following additional notes will be further disclosed with respect to the above-described embodiments of the present invention.

<1>
It is provided with a storage unit that can temporarily store powder or granular material, a discharge port for discharging powder or granular material in the storage unit, and a movement path for powder or granular material connecting the storage unit and the discharge port. A base material that is arranged at a predetermined distance from the hopper and the discharge port, and the powder or granular material discharged from the discharge port by free drop due to its own weight is conveyed in a predetermined direction and continuously conveyed. It is a powder or granular material spraying device provided with a transport means for spraying on the top.
When the maximum length in the transport direction of the powder or granular material by the transport means at the discharge port is D and the maximum length in the direction orthogonal to the transport direction at the discharge port is W, the W / D is 100 or less. ,
When the amount of powder or granular material discharged from the discharge port per minute is M, and the target value of the amount of powder or granular material sprayed per minute by the transport means is m, M / m is 1.5 or more. can be,
When the bulk density of the powder or granular material is ρ, the area of the discharge port is S, and the separation distance between the discharge port and the transport means is G, m / (ρ × S × G) is 21 / min or more. , Powder and granular material spraying device.
<2>
The powder or granular material spraying device according to <1>, wherein the W / D is 80 or less, preferably 40 or less.
<3>
The powder or granular material spraying device according to <1> or <2>, wherein the W / D is 1 or more, preferably 10 or more.
<4>
The item according to any one of <1> to <3>, wherein the m / (ρ × S × G) is 30 / min or more, preferably 50 / min or more, and more preferably 100 / min or more. Powder and granular material spraying device.
<5>
The item according to any one of <1> to <4>, wherein the m / (ρ × S × G) is 1000 / min or less, preferably 800 / min or less, more preferably 650 / min or less. Powder and granular material spraying device.
<6>
The powder or granular material spraying device according to any one of <1> to <5>, wherein the M / m is 80 or less, preferably 8 or less.
<7>
The powder or granular material spraying device according to any one of <1> to <6>, wherein the M / m is 2 or more, preferably 3 or more.
<8>
When the maximum particle size of the powder or granular material is r, m / (ρ × (D / r) ² ) is 100,000 mm ³ / min or less, preferably 80,000 mm ³ / min or less. The powder or granular material spraying device according to any one of the above items.
<9>
If the maximum particle size of the particulate material was r, the m / (ρ × (D / r) 2) is 1500 mm ³ / min or more, preferably 30,000 mm ³ / min or more, the <1> to <8 > The powder or granular material spraying device according to any one of the items.

<10>
The powder or granular material spraying device according to any one of <1> to <9>, wherein the D / r is 2 or more, preferably 6 or more, where r is the maximum particle size of the powder or granular material.
<11>
The powder or granular material spraying device according to any one of <1> to <10>, wherein the D / r is 30 or less, preferably 18 or less, where r is the maximum particle size of the powder or granular material.
<12>
The powder or granular material spraying device according to any one of <1> to <11>, wherein the W / r is 3 or more, preferably 50 or more, where r is the maximum particle size of the powder or granular material.
<13>
The powder or granular material spraying device according to any one of <1> to <12>, wherein W / r is 1000 or less, preferably 200 or less, where r is the maximum particle size of the powder or granular material.
<14>
Item 2. The powder or granular material according to any one of <1> to <13>, wherein S / (r × r) is 4 or more, preferably 1000 or more, where r is the maximum particle size of the powder or granular material. Body sprayer.
<15>
Item 2. The powder or granular material according to any one of <1> to <14>, wherein S / (r × r) is 5000 or less, preferably 1100 or less, where r is the maximum particle size of the powder or granular material. Body sprayer.
<16>
The item according to any one of <1> to <15>, wherein G / r is 1 or more, preferably 3 or more, and more preferably 5 or more, where r is the maximum particle size of the powder or granular material. Powder and granular material spraying device.
<17>
The powder or granular material spraying device according to any one of <1> to <16>, wherein G / r is 20 or less, preferably 10 or less, where r is the maximum particle size of the powder or granular material.
<18>
A weighing device that continuously measures the total mass of the hopper and the powder or granular material stored in the hopper, and a unit of the powder or granular material that measures the amount of change in the total mass per unit time and is carried by the transport means. Any of the above <1> to <17> provided with a control means for controlling the transport capacity of the transport means according to the change amount so that the spray amount per hour matches the target value m. The powder or granular material spraying device according to item 1.
<19>
The powder according to any one of <1> to <18>, wherein the transport means includes a receiving means for receiving the powder or granular material discharged from the hopper and a vibration generating means for vibrating the receiving means. Granule spraying device.
<20>
The powder or granular material spraying device according to <19>, wherein the vibration generating means is fixed to the lower surface of the non-contact portion of the powder or granular material of the receiving means.
<21>
The powder or granular material spraying device according to <19> or <20>, wherein the control means controls a voltage and / or a frequency applied to the vibration generating means.
<22>
When the measuring device continuously measures the total mass of the powder or granular material, it means that the sampling time of the measuring data is more than 0 seconds and 1 second or less, according to any one of <18> to <21>. The described powder or granular material spraying device.
<23>
The control means is connected to a powder supply device installed on the storage unit of the hopper, and has a function of controlling the supply of powder or granular material into the storage unit. 22> The powder or granular material spraying device according to any one of.

<24>
A method for spraying powder or granular material, which comprises a step of spraying the powder or granular material on the base material to be continuously transported by using the powder or granular material spraying device according to any one of <1> to <23>. ..
<25>
The method for spraying powder or granular material according to <24>, wherein the m is 1 g / min or more, preferably 50 g / min or more, and more preferably 100 g / min or more.
<26>
The method for spraying powder or granular material according to <24> or <25>, wherein the m is 100,000 g / min or less, preferably 10000 g / min or less, more preferably 5000 g / min or less.

<27>
A method for producing a powder or granular material-containing article comprising a base material and powder or granular material arranged so as to be in contact with the base material.
A powder or granular material-containing article having a step of spraying powder or granular material on a substrate to be continuously transported by using the powder or granular material spraying device according to any one of <1> to <23>. Production method.
<28>
The method for producing a powder or granular material-containing article according to <27>, wherein the powder or granular material is a water-absorbent polymer or an electrolyte.
<29>
The method for producing a powder or granular material-containing article according to <27> or <28>, wherein the m is 1 g / min or more, preferably 50 g / min or more, and more preferably 100 g / min or more.
<30>
The method for producing a powder or granular material-containing article according to <27> to <29>, wherein the m is 100,000 g / min or less, preferably 10000 g / min or less, and more preferably 5000 g / min or less.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to such Examples.

[Examples 1 to 4 and Comparative Examples 1 to 3]
Using a powder or granular material spraying device having the same basic configuration as the powder or granular material spraying device 1 described above, powder or granular material (water-absorbent polymer particles) was sprayed on a substrate that was continuously conveyed in one direction. The entire inner and outer surfaces of the hopper in the powder or granular material spraying device used, including the inner side wall, were made of stainless steel. The maximum particle size r of the powder or granular material was measured by a dynamic light scattering method, and a laser diffraction / scattering type particle size distribution measuring device LA950V2 manufactured by HORIBA, Ltd. was used as the measuring device.
The step of spraying the powder or granular material on the base material by the powder or granular material spraying device is continuously performed for about 50 hours, and the clogging of the discharge port of the hopper (such as mooring of the powder or granular material in the moving path) during the spraying process is performed. The presence or absence was evaluated. In addition, the supply accuracy of the powder or granular material was evaluated by a measuring device. These evaluation results are shown in Table 1 below together with the dimensions of each part of the powder or granular material spraying device used, the physical property values of the sprayed powder or granular material, and the like.

The above-mentioned "presence or absence of clogging of the outlet of the hopper during the spraying process" was visually confirmed.
In addition to the standard deviation, a coefficient of variation (CV) was used as an evaluation index for the "supply accuracy of powder or granular material". The coefficient of variation is calculated by the following equation (1).
Coefficient of variation (%) = (standard deviation / average amount of powder or granular material sprayed) x 100 ... (1)
The smaller the values of both the standard deviation and the coefficient of variation, the smaller the variation in the amount of powder or granular material sprayed per unit time (1 minute), and the higher the evaluation. In particular, the coefficient of variation is an index that does not depend on the scale (average) of the data, and it can be said that the smaller the value of the coefficient of variation is, the more preferable it is.

Further, the "operation amount range" in Table 1 is calculated by the following formula (2).
Operation amount range (g / min /%) = Spray amount (g) per unit time (1 minute) of powder or granular material / Transport means output) ... (2)
In the above equation (2), the "transport means output" represents the output value of the vibration generating means configured in the transport means in this embodiment. For example, when the vibration generating means is a device that controls the magnitude of vibration in proportion to the magnitude of the voltage value, the transport means output = (output voltage value / maximum voltage value) × 100. The "manipulation amount range" is an index of the spray amount adjustment range, and the smaller the value of the spray amount range, the wider the range in which the spray amount can be adjusted, and the higher the evaluation.

Example 1 has the same target spray amount m as compared with Comparative Example 4 and Example 2 as compared with Comparative Example 3, but the standard deviation and the coefficient of variation, which are evaluation indexes of supply accuracy, are the same. It is clear that it is small and the supply accuracy is good. That is, it can be seen that the magnitude relationship of m / (ρ × S × G) ≧ 21 is effective for the supply accuracy.
In Example 2, the target spray amount m is the same as that in Comparative Example 1, the standard deviation and the coefficient of variation are almost the same, but the magnitude relationship of W / D ≦ 100 is effective for clogging of the discharge portion. You can see that.
Further, in Example 2, the target spray amount m is the same as that in Comparative Example 2, and the magnitude relationship of W / D ≦ 100 is satisfied, but the magnitude relationship of M / m ≧ 1.5 is the target spray amount. It turns out that it is effective in achieving.
Compared with Example 1, Example 3 satisfies all three magnitude relationships of W / D ≦ 100, M / m ≧ 1.5, and m / (ρ × S × G) ≧ 2021 / min, respectively. Therefore, it can be seen that the discharge port is not clogged, and further, since the coefficient of variation is small, it can be seen that the larger the target spraying amount m, the higher the effect of spraying with good quantitativeness of the present invention. Further, since the operation amount range is also smaller in Example 3, it is clear that the adjustment range of the target spray amount m is large and advantageous.

1,1A, 1B Powder or granular material spraying device 2 Hopper 20 Storage unit 21 Discharge unit 22 Movement path 23 Discharge port 23V Virtual extension area of discharge port 3,3A, 3B Transport means 30 Receiving means 31 Vibration generating means 32 Transport roll 33 Drive Roll 34 Driven roll 35 Conveyance belt 4 Control means 5 Weighing device 100 Base material P Powder or granular material MD Conveyance direction of powder or granular material by transport means CD Direction orthogonal to the transport direction of powder or granular material

Claims (8)

It is provided with a storage unit that can temporarily store powder or granular material, a discharge port for discharging powder or granular material in the storage unit, and a movement path for powder or granular material connecting the storage unit and the discharge port. A base material that is arranged at a predetermined distance from the hopper and the discharge port, and the powder or granular material discharged from the discharge port by free drop due to its own weight is conveyed in a predetermined direction and continuously conveyed. It is a powder or granular material spraying device provided with a transport means for spraying on the top.
When the maximum length in the transport direction of the powder or granular material by the transport means at the discharge port is D and the maximum length in the direction orthogonal to the transport direction at the discharge port is W, the W / D is 100 or less. ,
When the amount of powder or granular material discharged from the discharge port per minute is M, and the target value of the amount of powder or granular material sprayed per minute by the transport means is m, M / m is 1.5 or more. can be,
When the bulk density of the powder or granular material is ρ, the area of the discharge port is S, and the separation distance between the discharge port and the transport means is G, m / (ρ × S × G) is 21 / min or more. , Powder and granular material spraying device. The powder or granular material spraying apparatus according to claim 1, wherein the M / m is 100 or less. The powder or granular material spraying apparatus according to claim 1 or 2, wherein m / (ρ × (D / r) ² ) is 100,000 mm ^{3 / min or less, where r is the maximum particle size of the powder or granular material.} The powder or granular material according to any one of claims 1 to 3, wherein m / (ρ × (D / r) ² ) is 1500 mm ^{3 / min or more, where r is the maximum particle size of the powder or granular material.} Sprayer. A weighing device that continuously measures the total mass of the hopper and the powder or granular material stored in the hopper, and a unit of the powder or granular material that measures the amount of change in the total mass per unit time and is carried by the transport means. 3. The described powder or granular material spraying device. A method for spraying powder or granular material, which comprises a step of spraying the powder or granular material on a substrate that is continuously transported by using the powder or granular material spraying device according to any one of claims 1 to 5. A method for producing a powder or granular material-containing article comprising a base material and powder or granular material arranged so as to be in contact with the base material.
A method for producing a powder or granular material-containing article, which comprises a step of spraying powder or granular material on a substrate that is continuously transported by using the powder or granular material spraying device according to any one of claims 1 to 5. The method for producing a powder or granular material-containing article according to claim 7, wherein the powder or granular material is a water-absorbent polymer or an electrolyte.

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