JPH08257444A - Powder coating base material,ejector for ejecting powder formanufacturing said base material,apparatus for manufacturingpowder coating base material provided with said ejector, method for manufacturing powder coating base material and abrasive-coated sheet - Google Patents

Abstract

PURPOSE: To provide a powder jetting ejector capable of making the particle distribution uniform and controlling the particle size without causing the blocking and bridging of the powder, a device and a method for producing base materials for powder coating using the ejector and the base materials thus produced. CONSTITUTION: A mixing gas is supplied from the outside of a powder storage container 110 to the powder existing at least on the bottom of the container 110 through the inner wall of the container 110 where a nozzle 120 for jetting the gas and a gas discharging pipe 130 are disposed for mixing the powder in the ejector.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a powder-coated base material (particularly, a uniform and thin layer coated with a fine powder having cohesiveness).
(Abrasive material obtained by applying abrasive particles to a base material), powder ejecting ejector for producing the powder applied base material, powder coated base material manufacturing apparatus including the ejector, and powder coated base material manufacturing method (In particular, a method for producing an abrasive by applying abrasive particles to a base) and an abrasive sheet.

[0002]

2. Description of the Related Art As a powder ejection pump in a powder coating apparatus for delivering powder together with gas from a coating gun nozzle, one having a structure as shown in FIG. 12 is known. There is. That is, a porous plate 2 on which the powder to be applied is placed is provided below the powder supply tank 7, and one end of the porous plate 2 is open to the porous plate 2 and the other end is to the ejector 9. A straight tubular powder supply pipe 8 to be connected is provided. In the powder ejection pump having such a structure, the powder 1 is supplied to the upper part of the porous plate 2,
Flowing air 6 supplied to the bottom of the powder supply tank 7.
Passes through the porous plate 2 and agitates the powder 1 on the porous plate 2. Moreover, the powder 1 is supplied to the ejector 9 through the powder supply pipe 8 by the pressure Pa in the powder supply tank 7. Further, as similar examples, there are inventions described in JP-A-6-286872 and JP-A-6-304502.

The conventional powder coating apparatus as described above has the following problems. That is, the powder 1 was agitated to create a fluidized state on the porous plate 2 (hereinafter, agitation here means agitation to create a fluidized state) to obtain an appropriate particle size distribution. Even in this case, the powder 1 again causes blocking and bridging inside the powder supply pipe 8 and in the container of the ejector 9, and the particle size of the powder becomes coarse. Therefore,
Even if there is a shearing action of the powder 1 by the gas flow 5 supplied to the ejector 9, the particle size of the powder 1 becomes coarse and the particle size distribution also varies. Therefore, it is difficult for the conventional powder coating device to eject fine particles having a particle size distribution of 5 μm or less. Further, even if the particle size of the powder 1 is relatively large, its particle size distribution changes with time, making it difficult to control the particle size. The present invention has been made to solve such a problem, and an ejector for ejecting powder, which does not cause blocking or bridging of the powder again and which can make the particle size distribution uniform, and a powder including the ejector. It is an object of the present invention to provide a body coating substrate manufacturing apparatus, a powder coating substrate manufacturing method, a powder coating substrate having a uniform particle size distribution of the powder coated on the base, and a polishing sheet.

[0004]

The ejector according to the present invention is a powder ejecting ejector for ejecting powder to be applied to a base, which is made of a porous material and contains the above powder inside a container. A storage container for storing, and a jetting gas nozzle that is provided at the bottom of the storage container in the powder storage portion and that supplies a jetting gas for jetting the powder to the outside of the storage container into the storage container, A discharge pipe that is arranged coaxially with the nozzle for jetting gas at the bottom of the storage container and sends out the jetting gas and the powder from the inside of the storage container to the outside, and the storage container is In order to perform agitation for creating a fluidized state for at least the powder existing at the bottom of the storage container in which the nozzle for jetting gas and the discharge pipe are arranged, from outside the storage container via the inner wall of the storage container. And supplying a stirring gas for creating the fluidized state to Kikotai.

With this structure, the stirring gas passes through the inside of the storage container and is supplied to the powder stored in at least the bottom of the storage container in which the jetting gas nozzle and the discharge pipe are arranged. The powder is agitated in the storage container. Therefore, the storage container acts so as not to cause blocking and bridging of the stored powder, and also to make the particle size distribution uniform.

The powder coated substrate manufacturing apparatus of the present invention has a storage container or a powder supply device for supplying powder to the storage container, and manufactures a powder coated substrate coated with powder. A powder coating substrate manufacturing apparatus for use in the powder coating substrate manufacturing apparatus, wherein the powder coating substrate manufacturing apparatus is disposed on the downstream side of the ejector and the ejector, and is discharged from the ejector. And a coating device that coats the body on the base using a powder spray.

With such a configuration, in the ejector to which the powder is supplied from the powder supply device, the stirring gas passes through the inside of the storage container, and the jetting gas nozzle and the discharge pipe are arranged in the storage container. Since the powder is supplied to at least the powder stored in the bottom, the powder is agitated in the storage container. Therefore, the ejector acts so that the powder does not cause blocking or bridge,
It acts to make the particle size distribution uniform.

The method for producing a powder-coated base material of the present invention is a method for producing a powder-coated base material on which a powder is applied, which is a container made of a porous material. A storage container that stores the powder therein, and a jetting gas that is provided at the bottom of the storage container in the powder storage portion and that jets the powder to the outside of the storage container are supplied into the storage container. An ejection gas nozzle, and a discharge pipe which is arranged coaxially with the ejection gas nozzle at the bottom of the storage container and which delivers the ejection gas and the powder from the inside of the storage container to the outside. A powder supply step of supplying powder to the storage container of the ejector provided, and stirring for creating a fluidized state of at least the powder existing at the bottom of the storage container in which the nozzle for jetting gas and the discharge pipe are arranged. To do the above storage capacity After the powder stirring step of supplying a stirring gas from the outside to the powder through the inner wall of the storage container to create a flow state, and after the powder stirring step, the powder sent from the discharge pipe is collected. And a powder coating step of coating the base with a powder spray.

In the powder agitation step, the agitation gas is supplied to the powder stored at least at the bottom of the storage container, in which the jetting gas nozzle and the discharge pipe are arranged, through the inner wall of the storage container provided in the ejector. Therefore, the powder in the storage container is agitated and the powder does not cause blocking or bridging, and the particle size distribution can be made uniform.

The powder coated substrate of the present invention is manufactured by using the powder coated substrate manufacturing apparatus according to claim 4, or
It is manufactured by the powder coated substrate manufacturing method according to claim 5.

In particular, it is characterized in that abrasive particles of 5 μm or less are applied by a powder spray method.

Since the stirring gas is supplied to the powder stored at least at the bottom of the storage container in which the jetting gas nozzle and the discharge pipe are arranged, through the inner wall of the storage container provided in the ejector, the inside of the storage container The powder of (1) is agitated and the powder does not cause blocking or bridging, and the particle size distribution can be made uniform. Therefore, the particle size distribution of the powder ejected from the ejector and applied to the base can be made uniform.

[0013]

EXAMPLE A powder coated base material, a powder jetting ejector for manufacturing the base material, a powder coated base material manufacturing apparatus including the ejector, and a powder coating base, which are one embodiment of the present invention. The material manufacturing method will be described below with reference to the drawings.
The powder coating base material is manufactured by the powder coating base material manufacturing apparatus equipped with the powder ejecting ejector and by the powder coating base material manufacturing method.

1 to 4 are views showing the ejector. The ejector is for ejecting powder to be applied to a sheet-shaped material which is one form of the base.
In the present example, the sheet material is a polishing sheet. The ejector 100 shown in FIG. 1 and FIG. 2 is roughly classified into a storage container 110, a jetting gas nozzle 120, a discharge pipe 130, an outer frame container 140, and a gas pressure buffer layer 150.
Have and. In the storage container 110, the inside 111 of the container is formed in a mortar shape so that the powder can be easily supplied from the powder supply device described later and the powder can be easily ejected. Store the powder. Further, the storage container 110 is made of a porous material and can supply gas from the outer surface of the container to the inner surface of the container through numerous holes. or,
The wall thickness of the storage container 110 is the pressure loss generated by the wall thickness,
It is designed in consideration of the material strength, but is finally determined experimentally so that the gas is uniformly ejected from the inner wall surface 115 of the storage container 110.

The porous material may be of any type as long as the shape of the pores having a predetermined size can be secured. For example, SiC, A
It can be arbitrarily selected from ceramics such as l ₂ O ₃ or the like, plastics such as Teflon (registered trademark of DuPont), or metal materials or rubber-based materials of sintered stainless steel based on usage conditions. is there. If the size of the pores in the porous material is too small, the resistance when the gas passes through the pores becomes too large, and it becomes difficult to control the gas pressure. On the other hand, if it is too coarse, the powder adheres to the inner wall 115 of the storage container 110 while the ejector 100 is in use and is stopped, and clogging is likely to occur. Therefore, the optimum condition of the hole size is finally experimentally determined in relation to other factors such as the gas ejection pressure and the shape of the storage container 110. For example, in the experiment, when the gas ejection pressure is 0.01 MPa,
It has been confirmed that the pore size of the porous material is preferably set to 20 μm to 100 μm in the case where the particle size of the powder is about 10 μm, because the above-mentioned problems are generally less likely to occur.

The jet gas nozzle 120 is provided inside the container 11
No. 1 is a nozzle for supplying a jetting gas for jetting the powder stored in No. 1 to the outside of the container, and is stored in a recess 112 formed in the mortar-shaped bottom of the storage container 110. It is fitted from the outside of the container 110. The discharge pipe 130 is disposed in the recess 112 and coaxially with the jet gas nozzle 120, and jets the gas jetted from the jet gas nozzle 120 and the inside 110 of the container.
It is a pipe that discharges the powder stored in the storage container 110 to the outside of the storage container 110.

The outer frame container 140 is provided with an appropriate gap with respect to the outer side surface 113 of the storage container 110.
Is a container that surrounds the. The gap is the gas pressure buffer layer 1
Form 50. Further, in this embodiment, the gas pressure buffer layer 1 is provided between the bottom surface 114 of the storage container 110 and the outer frame container 140.
Although 50 is not provided, it may be provided. or,
The ejection gas nozzle 120 and the discharge pipe 130 penetrate the outer frame container 140. The material of the outer frame container 140 is preferably a metal material from the viewpoint of ensuring the strength of the ejector 100, but may be ceramics or the like as long as it has a certain level of strength.

The gas pressure buffer layer 150 becomes a closed space by screwing the upper lid 141 to the outer frame container 140, and is supplied from a stirring gas introduction hole 142 formed at one or more positions of the outer frame container 140. The pressure of the generated gas is not directly applied to a part of the storage container 110,
The pressure is applied almost uniformly to the entire outer wall of 0, and the storage container 11
It acts so that the gas ejection on the inner wall 115 of 0 becomes uniform. In the present embodiment, as shown in the figure, the gas pressure buffer layer 150 forms a communicating chamber, but it may be divided into predetermined regions. When the gas pressure buffer layer 150 is divided into predetermined regions, stirring gas introduction holes 142 are formed in the outer frame container 140 corresponding to the respective regions.

Further, in this embodiment, the gas pressure buffer layer 150 is provided between the storage container 110 and the outer frame container 140. However, like the ejector 170 shown in FIGS. 3 and 4, the gas pressure buffer layer 150 is provided. Need not be provided. In this case, the gas is directly supplied from the stirring gas introduction hole 142 to the outer side surface 113 of the storage container 110, and the supplied gas is the storage container 11
It is supplied to the inside of the storage container through the 0 hole. When the gas pressure buffer layer 150 is not provided, the storage container 11
It is preferable to dispose a plurality of stirring gas introduction holes 142 at appropriate positions so that the gas may be jetted from the inner wall 115 and the recess 112 of the mortar shape of 0.

Further, the upper lid 141 is provided with an opening 143 so that powder can be supplied to the container interior 111 of the storage container 110. Further, as the gas supplied to the jetting gas nozzle 120 and the stirring gas introducing hole 142, nitrogen gas,
It is an inert gas such as argon gas or air, or a gas obtained by controlling the humidity of these, preferably a liquid having a surface tension of 40 dyne or less, such as ethanol or a vapor of perfluorocarbon. Further, in the present embodiment, as shown in the drawing, the storage container 110, the outer frame container 140 and the like have a quadrangular outer shape, but the outer shapes are not limited to this.

The operation of the ejector 100 thus constructed will be described below. By supplying the stirring gas to the stirring gas introduction hole 142, a substantially uniform gas pressure is applied to the outer side surface 113 of the storage container 110 via the gas pressure buffer layer 150, and the stirring gas passes through the hole. Inside the storage container 1
11, the nozzle 120 for the jetted gas and the discharge pipe 1
The powder existing in at least the concave portion 112 provided at the bottom of the storage container 110 in which 30 is arranged is stirred, and further the powder stored in the inside 111 of the storage container 110 is stirred. On the other hand, when the ejection gas is ejected from the ejection gas nozzle 120, the agitated powder is ejected to the outside of the ejector 100 together with the ejection gas through the discharge pipe 130.

In such an operation, the pressure of the jetting gas supplied to the jetting gas nozzle 120 is P ₂ , the amount of the jetting gas is V ₂ , the powder suction negative pressure inside the storage container 111 is P ₃ , and the storage is performed. If the secondary suction gas amount discharged is sucked together with the powder inside the container 111 was set to V _3, with respect to ejection gas pressure P _2, the powder suction negative pressure P _3, for jetting a gas volume V _2, FIG. 5 shows an example of the result obtained by the experiment regarding the relationship of the secondary suction gas amount V ₃ . In the figure, white marks show the results relating to the ejector of the present embodiment, and black marks show the results relating to the conventional ejector. The following can be seen from FIG. 1) The jetting gas pressure P ₂ is primarily related to the spraying pressure from a coating means, for example, a corona charging type coating gun, and is arbitrarily set depending on the environment in which the powder is attached to the base to which the powder is applied. It should be set. 2) On the other hand, in order to uniformly apply the powder to the base evenly over time, the powder supply device controls the powder supply to the ejector under a certain condition, and the ejection is performed. Even if the working gas pressure P ₂ changes, it is necessary that the suction conditions at the orifice portion of the ejector, particularly the powder suction negative pressure P ₃ and the secondary suction gas amount V ₃ are maintained at constant conditions. 3) As shown in FIG. 5, in the ejector of the present embodiment, the powder suction negative pressure P ₃ and the secondary suction gas amount V ₃ are the ejection gas pressure P 3.
Regardless of ₂ , it is maintained almost constant, and it can be seen that it has high performance as an ejector function. On the other hand, in the ejector of the conventional example, the powder suction negative pressure P ₃ monotonically increases to the negative pressure side as the ejection gas pressure P ₂ increases, and the secondary suction gas amount V ₃ monotonically increases accordingly. It can be seen that the suction condition in the part changes greatly.

Next, the ejector 10 of this embodiment described above.
An example of a powder coating substrate manufacturing apparatus using 0 or an ejector 170 (hereinafter, the ejector 100 will be described as a representative) will be described. As shown in FIG. 6, the powder coating base material manufacturing apparatus 200 includes the ejector 10 described above.
0 and the storage container 1 provided on the upstream side of the ejector 100
A powder supply device 210 for supplying powder to the device 10, and a coating device 230 provided on the downstream side of the ejector 100 for coating the powder on a sheet-shaped base 250. The powder supply device 210 has a vibrating air slide 211. The vibrating air slide 211 has a vibrating floor 212 that vibrates the floor surface to which the powder is supplied and jets gas from the floor surface to supply the powder to the ejector 100 while dispersing the powder. The vibrating bed 212 vibrates and blows out gas to cause fine powder that has been measured and supplied to the supply side of the vibrating bed 212 to flow to the discharge side of the vibrating bed 212. In addition, specifically, the vibration source of the vibrating air slide 211 is V-20B made by Shinko Electric Co., Ltd., and the vibrating floor 212 is made of stainless steel and has a mesh of 9 μm. The pressure of the gas supplied to the vibrating floor 212 is 0.01 MPa.

As another example of the powder supply device, a reciprocating feeder, a vertical axis rotary feeder, a horizontal axis rotary feeder, a screw type feeder, an endless belt type feeder, a container moving type feeder, an air flow type feeder. , Or a combination of these.

The coating device 230 is a corona charging type coating gun in this embodiment, and specifically, it is manufactured by Lansburgh Industry Co., Ltd. The material of the storage container 110 of the ejector 100 is made of Teflon (registered trademark of DuPont), and the stirring gas pressure is 0.01 MPa. Moreover, the gas pressure P ₂ for ejection is set to 0.3 MPa.

Other examples of the coating device include a hybrid type coating gun and a friction charging type coating gun. A flow dispersion device may be configured by mechanically connecting the vibrating air slide 211 and the ejector 100, and the ejector 100 may also be vibrated by the vibration of the vibrating air slide 211. In addition, the ejector 100 and the coating device 23
The powder transfer tube between 0 and 0 may be vibrated.

The powder coating base material manufacturing apparatus 200 having such a structure operates as follows. That is, the fine powder 260 supplied to the vibrating air slide 211 is supplied to the storage container 110 of the ejector 100 while being prevented from causing blocking and the like due to the vibration of the vibrating air slide 211 and the ejection of gas. In the storage container 110 of the ejector 100, as described above, the powder in the storage container 110 is agitated by the agitation gas, and is ejected from the discharge pipe 130 by the ejection gas to be supplied to the coating device 230. The coating device 230 coats the supplied powder on the sheet that is the base 250 by a powder electrostatic coating method.

In the powder coating substrate manufacturing apparatus 200 described above, the sheet 250 supplied to the vibrating air slide 211 is supplied.
With reference to FIGS. 7 and 8, the particle size distribution of the powder 260 until it is applied will be described while comparing the case where the ejector 100 of the present embodiment is used and the case where the conventional ejector is used. The powder applied to the sheet 250 is abrasive powder. The abrasive powder applied to the sheet 250 is milled, then classified, granulated with a certain particle size distribution, and temporarily stored. The particle size distribution at this time is defined as "a '". On the other hand, in a state where the manufacturing of the polishing sheet 251 is started, the powder 260 is supplied to the vibrating air slide 211 in a predetermined amount, and is in a fluidized state due to the ejection of gas from the vibrating floor 212 of the vibrating air slide 211 and the vibration. The agglomerated powder is subdivided and its coarse particle size distribution is "b". Then, the particle size distribution is supplied to the storage container 110 of the ejector 100 in the state of “b”.

In the storage container 110 of the ejector 100 of this embodiment, as described above, the powder is agitated by the agitating gas, so that the fluidized state is maintained and the powder is distributed between the powders as in the prior art. The particle size distribution maintains the state of fine particles without causing blocking. The particle size distribution at this time is "c" shown in FIG. On the other hand, in the conventional ejector, the supplied powder accumulates in the ejector, causes blocking between the powders, and becomes coarse. Therefore, the particle size distribution becomes "c '" shown in FIG. The powder in the ejector 100 of the present embodiment is subjected to shearing force and crushed when it is carried on the high-speed gas flow of the ejection gas at the orifice portion of the ejector 100, and the particle size distribution becomes “e” shown in FIG. 7. That is, when the ejector 100 of the present embodiment is used, blocking between powders in the ejector 100 does not occur, so the particle size distribution "e" of the applied powder is a fine and uniform distribution, and the primary powder It is possible to easily obtain a substance having a particle size distribution close to "a" of the body. On the other hand, when the conventional ejector is used, blocking occurs in the ejector, so that the particle size distribution "e '" of the applied powder is equal to the particle size distribution "a" of the primary powder as shown in FIG. Will be inferior to In this way, the ejector 100 of this embodiment is
In the case of using, the powder is kept in a fluidized state in the ejector container, so that blocking or the like does not occur and it is easy to maintain a fine particle distribution. Further, since the powder suction at the ejector's orphes can be made constant regardless of the powder suction negative pressure P ₃ , the powder can be coated uniformly.

The apparatus 20 for manufacturing a powder coating substrate as described above.
By using 0, the polishing sheet is manufactured under various conditions. An example of the powder coating substrate manufacturing method will be described below. Abrasive kraft paper is used as the sheet-shaped base 250. The following adhesives are used. First, the adhesive is applied on the base 250 at 22 ° C. and 110 g / m ² . Powder spray coating is performed on the adhesive applied to the base 250 under the following conditions. Aluminum oxide # 4000 is used as the powder. As a means for supplying powder to the vibrating air slide 211, a table feeder (manufactured by Koken Patalex Co., Ltd., supply amount 25 g / m 2) is used.
in) is used. Using the vibrating air slide 211, the ejector 100 and the coating device 230, the base 250
Perform powder spray coating on. There are two types of spray coating methods, one with and without an electric field applied. The powder spray-coated layer is dried for 5 minutes at 140 ° C. in a ventilation oven, and the same adhesive is further applied on the dried layer under the same conditions and dried under the same conditions.

Next, the powder coating base material manufacturing apparatus 20 described above.
A powder coating sheet (hereinafter also referred to as “abrasive paper”), which is one form of the powder coating substrate manufactured by the powder coating substrate manufacturing method using Description will be made in comparison with the manufactured powder coating sheet. When a sheet is manufactured using a conventional ejector in which the powder contact surface of the ejector that is in contact with the powder is not made of a porous material, the powder has a large cohesive force, that is, a large particle size, that is, a rough count. The powder consisting of particles can be applied using a conventional ejector, but the particles consisting of particles with a small particle size (for example, 5 microns or less), that is, particles consisting of fine counts, are It adheres and accumulates on the powder contact surface of the conventional ejector. The powder thus deposited is sucked into the gas flow of the jetting gas supplied to the conventional ejector by the action of gravity or the like when it reaches a certain amount, and is dispersed by the shearing action of the jetting gas. However, the powder sucked into the ejector in the agglomerated state is not sufficiently dispersed, and the agglomerated powder is sucked into the gas flow irregularly, so that the powder in the gas ejected from the conventional ejector The concentration of can not be kept constant. Thus, when the conventional ejector is used, the powder particles in the agglomerated state are present on the surface of the sheet, and the concentration of the powder ejected from the ejector is unstable. Only products with uneven film thickness could be obtained. On the other hand, when the ejector of the present embodiment described above is used, the phenomenon as described above does not occur, and it is possible to manufacture products of various abrasive particle sizes from coarse particles to fine particles without any problem. it can.

Regarding the product non-defective rate of each abrasive paper with various abrasive particle diameters, Table 1 shows a comparison result between the case where the ejector of this embodiment is used and the case where the conventional ejector is used.
Shown in The powder is applied to the sheet by the electrostatic powder spray method. Further, in Table 1, "A" in the ejector column of the present embodiment shows the case of the ejector 170 provided with the plurality of stirring gas introduction holes 142 without providing the gas pressure buffer layer 150, and "B". , “C” indicates the case of the ejector 100 provided with the gas pressure buffer layer 150. or,
"A" and "B" apply an electric field at the time of application, and "C"
Is the case where it does not work.

[0033]

[Table 1]

Polishing efficiency of a polishing paper prepared by a conventional method (slurry method) in which abrasive particles are mixed in advance with an adhesive and applied to a base, and polishing efficiency of a polishing paper prepared by using the ejector of this embodiment. Table 2 shows the results of comparison.
Incidentally, the method of coating the abrasive paper produced by using the ejector of the present example is based on the powder spray method, and the ejector used is provided with the gas pressure buffer layer 150. Further, the polishing efficiency means a weight change of the sample before and after polishing when a sample of 4 × 6 inch square is rubbed 1000 times with abrasive paper. The larger this value,
This shows that the polishing can be performed well. Also, Table 2
In the method according to the present embodiment indicated by the numbers "1" to "4", the method of the present embodiment indicated by the numbers "5" and "6" is used by using the abrasive paper shown in FIG. In the above, the polishing paper shown in FIG. 10 is used.

[0035]

[Table 2]

As can be seen by comparing FIG. 9 showing the polishing paper according to the present embodiment with FIG. 11 showing the polishing paper according to the conventional case, the polishing efficiency of the polishing paper according to the present embodiment is different from that of the conventional method. The reason for the better comparison is due to the morphology of the abrasive particles 252 of the powder on the base 250.
That is, in the past, since the powder ejected from the ejector had a strong cohesive property, it was not possible to apply the powder as it is,
A mixture of powder and adhesive was applied to the base using a spatula or the like. Therefore, as shown in FIG. 11, the edge portion 252a of the abrasive particles 252 does not stand upright with respect to the base, but becomes lateral in the same direction as the extending direction of the base. On the other hand, in this embodiment, since the cohesiveness of the powder in the ejector can be reduced, the abrasive particles 25
Only 2 can be applied to the base 250. That is, as shown in FIG. 9, a state in which the adhesive is applied on the surface of the base 250 and a state in which the second adhesive 253 is further applied to the powder as shown in FIG. Can be made. Therefore, in the polishing paper according to the present embodiment, the edges 252a of the polishing particles 252 are irregularly arranged with respect to the base 250, and the surface of the polishing paper is not formed to be flat as in the conventional method, so that the polishing efficiency is about 3 A remarkable difference of double is generated. However, as shown in Table 2, even in the examples, the directivity of the abrasive particles 252 to the base 250 (in the case where the electric field is applied by the powder spray, the long axis of the abrasive particles is aligned in the direction of the applied electric field). However, a difference in polishing efficiency was observed due to the degree of coating with the adhesive) and the degree of coating of the adhesive, but the difference was smaller than that of the conventional example, and it can be said that the effect is remarkable. It should be noted that the reason why the polishing efficiency shown in FIG. 10 is better than that of the conventional example is that the adhesive 253 is the abrasive particles 2
This is because even if the entire surface of 52 is covered, the portion of the adhesive 253 is compressed during the polishing operation and the abrasive particles 252 act on the object to be polished. Further, in this embodiment, the edge 252a of the abrasive particle 252 is used. Is more suitable for the polished surface of the object to be polished than the conventional example.

When a non-woven fabric made of nylon resin is coated with Al ₂ O ₃ powder having a particle size of 3 μm, the polishing cloth in this embodiment has a finer and more uniform base than the conventional one. Powder is coated on 250.

In the above description of this embodiment, the particle size is particularly 5 μm.
The powder having a particle size of m or less is taken as an example, but the powder is not limited to this, the powder-coated base material of the present embodiment, the powder ejecting ejector for manufacturing the base material, and the powder including the ejector. The coated substrate manufacturing apparatus and the powder coated substrate manufacturing method have a particle size of 5
Of course, it is also applicable to particles having a size of more than μm.

[0039]

As described above in detail, according to the ejector of the present invention, the agitating gas passes through the inside of the storage container, and the powder existing at least at the bottom of the storage container where the jet gas nozzle and the discharge pipe are arranged. Since the powder is agitated in the storage container, the powder does not cause blocking or bridge, and the particle size distribution of the powder ejected from the ejector can be made uniform.

Further, according to the powder coated substrate manufacturing apparatus of the present invention, in the ejector to which the powder is supplied from the powder supplying apparatus, the stirring gas passes through the inside of the storage container, and the jetting gas nozzle and the discharge gas are discharged. Since the powder is supplied to the powder existing at least in the bottom of the storage container where the pipe is arranged, the powder is agitated in the storage container, and the powder is ejected from the ejector without causing blocking or bridge. The particle size distribution of the powder can be made uniform.

Further, according to the method for producing a powder coated base material of the present invention, in the powder agitating step, at least the above-mentioned storage in which the jet gas nozzle and the discharge pipe are arranged through the inner wall of the storage container provided in the ejector. Since the agitation gas is supplied to the powder existing at the bottom of the container, the powder in the storage container is agitated and the powder does not cause blocking or bridging, and the particle size distribution of the powder ejected from the ejector is It can be made uniform.

Further, since the agitating gas is supplied to at least the powder existing at the bottom of the storage container in which the jetting gas nozzle and the discharge pipe are arranged, through the inner wall of the storage container provided in the ejector, the storage container The powder inside is agitated and the powder does not cause blocking or bridging, and the particle size distribution of the powder ejected from the ejector can be made uniform. Therefore, the powder-coated base material of the present invention can be a powder-coated base material in which the particle size distribution of the powder applied to the base is uniform.

[Brief description of drawings]

FIG. 1 is a plan view of an ejector according to an embodiment of the ejector of the present invention.

FIG. 2 is a cross-sectional view of the ejector taken along line I-I shown in FIG.

FIG. 3 is a plan view of an ejector in another embodiment of the ejector shown in FIG.

FIG. 4 is a cross-sectional view of the ejector taken along line III-III shown in FIG.

5 is a powder suction negative pressure P ₃ and an ejection gas amount V with respect to the ejection gas pressure P ₂ in the ejector shown in FIG.
_2, a relationship of the secondary suction gas amount V ₃ and is a graph showing the results obtained in the experiment.

FIG. 6 is a diagram showing the configuration of the above-described manufacturing apparatus which is an embodiment of the powder coating substrate manufacturing apparatus of the present invention.

7 is a graph showing changes in the particle size distribution of the powder until it is supplied to the manufacturing apparatus shown in FIG. 6 and applied to the base.

FIG. 8 is a graph showing a change in particle size distribution of the powder in the conventional powder coating substrate manufacturing apparatus until it is supplied to the conventional manufacturing apparatus and coated on the base.

9 is a diagram showing a state of powder particles in the powder coating base material manufactured by the manufacturing apparatus shown in FIG.

10 is a diagram showing another state of the powder particles in the powder coating base material manufactured by the manufacturing apparatus shown in FIG.

FIG. 11 is a diagram showing a state of powder particles in a powder coating substrate manufactured by a conventional powder coating substrate manufacturing apparatus.

FIG. 12 is a cross-sectional view showing a conventional ejector.

[Explanation of symbols]

100 ... Ejector, 110 ... Storage container, 120 ... Nozzle for jet gas, 130 ... Discharge pipe, 140 ... Outer frame container, 1
50 ... Gas pressure buffer layer, 170 ... Ejector, 200 ... Powder coating substrate manufacturing apparatus, 210 ... Powder supply apparatus, 211 ...
Vibrating air slide, 230 ... Coating device, 250 ... Base, 252 ... Abrasive particles, 252a ... Edge.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Muneo Haga 3-8-8 Minamihashimoto, Sagamihara-shi, Kanagawa Sumitomo 3M Limited

Claims (8)

[Claims] 1. A powder ejection ejector for ejecting powder to be applied to a base, comprising a storage container (110) made of a porous material for storing the powder inside the container, and a powder storage portion. In the nozzle for jet gas (1), which is provided at the bottom of the storage container and supplies the jetting gas for jetting the powder to the outside of the storage container to the inside of the storage container.
20), and a discharge pipe (130) arranged coaxially with the jetting gas nozzle at the bottom of the storage container to deliver the jetting gas and the powder from the inside of the storage container to the outside. The storage container is provided with an outlet of the storage container from the outside of the storage container in order to perform stirring for creating a fluidized state with respect to the powder present at least in the bottom of the storage container in which the nozzle for jetting gas and the discharge pipe are arranged. An ejector for ejecting powder, characterized in that a stirring gas for creating a fluid state is supplied to the powder through an inner wall. 2. The agitating device which is provided with a proper gap to at least an outer surface of a bottom portion of the storage container in which the jet gas nozzle and the discharge pipe are arranged and which is formed by sealing the gap and is supplied to the gap. The ejector for ejecting powder according to claim 1, further comprising an outer frame container (140) forming a gas pressure buffer layer (150) for applying a gas pressure to the storage container substantially uniformly. 3. The powder ejection ejector according to claim 2, wherein the gas pressure buffer layer is formed so as to surround the storage container. 4. A powder coating substrate manufacturing apparatus for manufacturing a powder coated substrate coated with powder, comprising: a storage container or a powder supply device for supplying powder to the storage container. The ejector (10) according to any one of claims 1 to 3, wherein the powder coating substrate manufacturing apparatus (200) is provided.
0, 170) and an applicator (230) which is arranged on the downstream side of the ejector and applies the powder delivered from the ejector to the base by using a powder spray. Body coating substrate manufacturing equipment. 5. A storage container (110) for producing a powder-coated base material coated with powder, comprising a porous material and storing the powder inside the container. ), And a jetting gas nozzle (120) which is provided at the bottom of the storage container in the powder storage portion and supplies a jetting gas for jetting the powder to the outside of the storage container into the storage container. An ejector provided with a discharge pipe (130) arranged coaxially with the nozzle for jetting gas at the bottom of the storage container to send the jetting gas and the powder from the inside of the storage container to the outside. In order to perform agitation for creating a fluidized state, the powder supply step of supplying powder to the storage container, and the powder existing at least at the bottom of the storage container in which the nozzle for jetting gas and the discharge pipe are arranged are described above. Outside the storage container To the powder via the inner wall of the storage container to supply a stirring gas for creating a flow state, and after the powder stirring step, the powder sent from the discharge pipe is powdered. And a powder coating step of coating the base with a body spray. 6. A powder produced by using the apparatus for producing a powder-coated substrate according to claim 4, or produced by the method for producing a powder-coated substrate according to claim 5. Coating base material. 7. The powder coating according to claim 6, wherein the base is a sheet-shaped material, and the powder applied to the sheet material is abrasive particles, and the particle size of the abrasive particles is 0.1 to 5 μm. Base material. 8. The polishing particle size produced by the powder spray coating method is 0.1 to 5 μm,
Abrasive sheet.