JP3773191B2 - Powder spreader - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a powder spraying device, and prevents plastic film or rubber sheet from adhering (blocking) between wound laminates, plastic films, rubber sheets, and the like, and to improve slipperiness in a subsequent process. The present invention relates to a powder spraying device that sprays powder onto the surface of a sheet or the like.
[0002]
[Prior art]
Wound thin laminates, plastic films, rubber sheets, and the like often adhere to each other if left untouched, causing inconveniences in later processes such as printing. For this reason, when a plastic film or a rubber sheet is generally taken up, a fine powder is dispersed on these surfaces to prevent the occurrence of a blocking phenomenon. As a conventional powder spraying device, a rotating roller is disposed in a lower opening of a powder storage tank in which powder to be sprayed is stored, and this roller is rotated to rotate the powder in the powder storage tank. In addition, a powder is widely used in which the adhered powder is released from the roller by corona discharge or the like, and dispersed on a material to be dispersed such as a plastic film or a rubber sheet passing under the roller.
[0003]
[Problems to be solved by the invention]
By the way, as the powder used to prevent the blocking phenomenon, starch or the like is generally used, and the particle size is as small as about 15 to 25 μm and is easily scattered. For this reason, when a plastic film or rubber sheet passes under the roller, the surrounding air generates an air flow accompanying the movement of the plastic film or rubber sheet, and this air flow causes the powder falling from the roller to scatter around. As a result, the spraying effect is not only reduced, but the surroundings are soiled. Further, due to scattering to the surroundings, there is a dropping of the powder that accumulates on the peripheral members and falls onto the object to be sprayed. It is necessary to surely prevent such a drop-off because the drop-off will be a harmful effect.
[0004]
The present invention was made to eliminate the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a powder spraying device that can reduce the amount of powder scattered and lost, and can prevent the dropping of a button. It is said.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a powder spraying apparatus according to the present invention rotates a spraying roller disposed in a lower part of a powder storage tank, and causes powder adhered to the spraying roller to move below the spraying roller. In the powder spraying device for spraying on the sprayed body passing through the space, a space partition roller is provided close to the spraying roller on the upstream and downstream sides of the spraying roller along the flow direction of the sprayed body, A spraying closed space is formed immediately below, and the space partition roller is disposed with a gap and is forcedly rotated . In this case, each of the rollers is preferably a roller with a discharge line. Further, the present invention provides a powder spraying device that rotates a spraying roller disposed in a lower part of a powder storage tank and sprays powder adhering to the spraying roller onto a sprayed object that passes under the spraying roller. A space partition roller provided close to the spray roller on the upstream and downstream sides of the spray roller along the flow direction of the sprayed body, forming a spray closed space immediately below the spray roller, and the space partition The roller can be a powder spraying device characterized in that air is forcedly rotated in the direction of entrainment of air from the space between the spraying roller and the spraying closed space.
[0006]
Also, the present invention is configured to include a nozzle for spraying powder in the spraying closed space by forming a spraying closed space by arranging rollers in a stacked state on the upper surface portion of the object to be transported. That's fine. What is necessary is just to comprise the said stacking roller from a pair of lower roller arrange | positioned at the upper surface site | part of a to-be-spread body, and the upper roller arrange | positioned above this pair of lower roller. The nozzle may spray powder from a gap between rollers.
[0007]
[Action]
In the present invention configured as described above, a closed space is formed on the upper surface portion of the object to be sprayed using a roller, and powder is dispersed inside this space. Therefore, the powder does not scatter and disappear in other parts. In particular, by rotating the lower roller, even if a drop occurs, it can be introduced into the closed space and contribute to the application to the object to be applied. As a result, it is possible to improve the spraying efficiency and effectively prevent the falling powder from dropping onto the object to be sprayed as it is.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the powder spraying apparatus according to the present invention will be described in detail with reference to the accompanying drawings.
1 and 2 are a cross-sectional view and an end view of a powder spraying apparatus according to an embodiment of the present invention. As shown in the figure, the powder spraying device according to the embodiment has a powder storage tank 12 configured to store powder 10 such as starch and to spray the stored powder 10 from below. . More specifically, the powder storage tank 12 is formed by forming a storage space 14 having a rectangular cross section inside, so that the powder 10 accommodated by attaching a lid 16 to the upper part is prevented from scattering outside. Yes. Further, a spraying roller 18 having a diameter smaller than the width of the accommodation space 14 is disposed in a rectangular state at a lower portion of the storage tank 12 in a horizontal state with the lower half exposed to the outside. And the doctor blade 20 arrange | positioned so that a front-end | tip opening width may be narrowed in V shape at the lower outer edge of the powder storage tank 12 is attached with the holding plate 22, and a front-end | tip blade touches toward the both sides | surfaces of the spraying roller 18. It is extended. Thereby, the doctor blade 20 fills the gap between the spray roller 18 and the lower opening of the storage space 14 of the powder storage tank 12 and is in close contact with the outer surface of the spray roller 18. And the powder 10 is supplied to the powder storage tank 12 from the powder supply tank which is not shown in figure by the automatic powder supply apparatus etc. which were described in Japanese Utility Model Publication No. 53-6232 concerning the application of this-application applicant, for example.
[0009]
The spraying roller 18 is formed in a hollow cylindrical shape, and has fine irregularities (not shown) on the outer peripheral surface, and the spraying roller 18 rotates as shown by an arrow 24 so that it is fine. The powder 10 that has entered the uneven surface is conveyed to the lower part of the spraying roller 18 by a doctor blade 20 with a predetermined layer thickness. A drive motor (not shown) such as a gear motor for rotating the spray roller 18 is connected to one end side of the spray roller 18.
[0010]
In addition, a discharge line 28 is disposed below the spraying roller 18 and is disposed close to the peripheral surface of the spraying roller 18. The discharge line 28 forms a well-known discharge sprayer together with the spray roller 18 and is connected to a high voltage AC power source (not shown). The powder 10 carried to the lower part by the spray roller 18 is discharged from the spray roller 18. The powder 10 is dispersed on the upper surface of the object to be dispersed 30 such as a plastic film or a rubber sheet that is released by electric discharge and moves below the spraying roller 18.
[0011]
By the way, in this embodiment, a pair of space partition rollers 32 and 34 that are located upstream and downstream of the spray roller 18 along the flow direction of the sprayed object and are close to the spray roller are provided, and the spray roller The spraying closed space 36 is formed immediately below 18. That is, a pair of space partition rollers 32 and 34 are arranged in parallel in the front and rear of the conveying direction so that the gap between them is smaller than the diameter of the spreading roller 18 along the width direction of the object 30. The spreading roller 18 is arranged on the 32, 34 so as to be stacked. The space partition rollers 32 and 34 are set so as to form a gap of about 2 to 5 mm from the surface of the object to be sprayed 30 and are not directly in contact with the spray roller 18 but the proximity gap is small. Yes.
[0012]
The spraying closed space 36 is closed by the partition rollers 32 and 34 in the flow direction of the conveying line, but is closed by the end plate 26 shown in FIG. 2 in the width direction. The end plate 26 can adjust the position in the width direction of the transport line so as to follow the change in the width of the transport line.
[0013]
The space partition rollers 32 and 34 have a rotating roller structure similar to the spray roller 18, and this may be configured to obtain power from a motor different from the drive motor of the spray roller 18. Of course, you may make it rotate with the drive force of the same drive motor. In addition, the spray roller 18 has a rotation direction such that the lower edge side is along the transport direction of the sprayed body 30 (arrow 24), but the upstream space partition roller 32 is transported by the facing portion on the sprayed body 30 side. The downstream space partition roller 34 is set so that the facing portion on the scattered object 30 side is in the forward direction with respect to the transport direction so as to be opposite to the direction. Thereby, the space partition rollers 32 and 34 always entrain air from the gap with the spraying roller 18 to the spraying closed space 36 side.
[0014]
The rotation of the roller 18 and the space partition rollers 32 and 34 is rotated by another motor as described above, but the spray roller 18 is rotated slowly in the range of 0.15 to 2.00 rpm, and the space partition roller 32, 34 is rotated at 20 rpm or more. The number of rotations of the spray roller 18 is variable according to the amount of powder sprayed on the return line, and is adjusted according to the required amount of powder according to the material of the line, the line speed, and the like. On the other hand, the role of the space partition rollers 32 and 34 is to form a closed space and to prevent powder from dropping off by rotating. When the space partition rollers 32 and 34 are rotated at a constant speed of about 2 rpm, for example, after the powder of the space partition rollers 32 and 34 is peeled off by the discharge line, the powder is again separated between the space partition rollers 32 and A large amount adheres to 34. For this reason, the amount of powder to be reattached is reduced by rotating the space partition rollers 32 and 34 at a certain fast rotational speed.
[0015]
Such space partition rollers 32 and 34 are also provided with discharge lines 38 and 40, respectively. The discharge lines 38 and 40 are attached to the rollers 32 and 34 in the spraying closed space 36 and are arranged close to the peripheral surfaces of the rollers 32 and 34 in the same manner as the discharge line 28 attached to the spraying roller 18. It is. The discharge lines 38 and 40 constitute a well-known discharge sprayer together with the rollers 32 and 34 and are connected to a high-voltage AC power source (not shown), and adhere to the surfaces of the rollers 32 and 34 in the scattering closed space 36. The powder 10 is separated from the surfaces of the rollers 32 and 34 by electric discharge and removed. Since the space partition rollers 32 and 34 do not perform a direct spreading action, the surface is formed smoothly and the surface of the spreading roller 18 is not provided with fine irregularities.
[0016]
In the embodiment configured as described above, when the spray roller 18 is rotated as indicated by an arrow 24 by a drive motor (not shown), the powder 10 in the powder storage tank 12 is moved by the action of the doctor blade 20 to the spray roller 18. It adheres uniformly to the surface and is carried to the lower part of the spreading roller 18. The powder 10 adhering to the spreading roller 18 is discharged by the AC high voltage applied to the discharge line 28, separated from the roller 18 and dispersed, and falls onto the upper surface of the sprayed body 30.
[0017]
On the other hand, space partition rollers 32 and 34 are disposed at upstream and downstream positions along the conveying direction of the spraying roller 18 to form a space 36 that closes the spraying region immediately below the spraying roller 18. Thereby, the sprayed powder 10 is not scattered and lost. In this closed space, there is also powder 10 adhering to the surfaces of the space partition rollers 32 and 34, but this is because the surface is smooth and rotating, and is removed from the surface by the discharge lines 38 and 40. The spraying efficiency to the object 30 is increased. Further, since there is a minute gap between the spreading roller 18, the space partition rollers 32 and 34, and the object to be spread 30, there is also powder 10 that leaks from the sprayed closed space 36 through this gap. Even if the rollers 32 and 34 are rotated so that the powder storage tank 12 easily deposits and accumulates, even if the space partition rollers 32 and 34 are arranged below and fall on this, the inside of the closed space 36 The problem of dropping off is eliminated.
[0018]
Further, the air accompanying the object to be sprayed 30 is prevented from entering the spraying closed space 36 immediately below the spraying roller 18 by the space partition roller 32 arranged on the upstream side of the spraying roller 18. For this reason, there is almost no turbulent air flow below the spraying roller 18, and the powder 10 released from the spraying roller 18 is naturally dropped and sprayed onto the body 30 without being scattered around. Therefore, the dispersion efficiency of the powder 10 can be increased, the loss of the powder 10 can be reduced, and the surrounding contamination due to the scattering of the powder 10 can be reduced.
[0019]
In the above-described embodiment, the case where the object 30 is a laminate, a plastic film, or a rubber sheet has been described. However, a printed matter may be used.
[0020]
FIG. 3 shows a powder spraying apparatus according to the second embodiment . In this example, three rollers 41, 42, 44 are arranged in a stacked state on the upper surface portion of the object 30 to be transported to form a spraying closed space 46, and the powder 10 is placed in the spraying closed space 46. Is provided with a nozzle 48 for spraying the liquid. More specifically, the stacking roller is composed of a pair of lower rollers 41 and 42 disposed on the upper surface portion of the object to be spread, and an upper roller 44 disposed above the pair of lower rollers 41 and 42. Has been. The nozzle 48 is arranged to spray the powder from the gap between the rollers. For this reason, the gap between one lower roller 41 and the upper roller 44 is made larger than the other gap, and the powder 10 is introduced into the closed space 46 and dispersed from this gap. The rollers 41, 42, and 44 may be rollers having a smooth surface due to their properties, and may be plated.
[0021]
【The invention's effect】
As described above, according to the present invention, the spray roller disposed in the lower part of the powder storage tank is rotated, and the powder adhered to the spray roller passes through the lower part of the spray roller. In the powder spraying device for spraying, a space partition roller is provided close to the spraying roller upstream and downstream of the spraying roller along the flow direction of the object to be sprayed, and a spraying closed space is provided immediately below the spraying roller. In addition to forming , the space partition roller is arranged to have a gap with the object to be sprayed and is configured to forcibly rotate, so that scattering of powder sprayed from the spray roller can be prevented and spray efficiency can be improved. , It is possible to reduce the surrounding contamination due to the scattered powder. And, since the space partition roller is arranged at the front and rear positions of the spray roller, even if the drop off from the support member of the spray roller occurs, it rides on the space partition roller, and this is introduced into the closed space and sprayed. It has a configuration that can avoid harmful effects caused by dropping off.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a powder spraying apparatus according to an embodiment of the present invention.
FIG. 2 is an end view of the powder spraying device.
FIG. 3 is a cross-sectional view of a powder spraying apparatus according to a second embodiment of the present invention.
[Explanation of symbols]
10 ......... powder, 12 ...... powder storage tank, 14 ...... powder storage space, 16 ...... lid, 18 ...... spray roller, 20 ...... doctor blade, 22 ......... presser Plate, 24 ......... Arrow, 26 ......... End plate, 28 ......... Discharge line, 30 ......... Spread body, 32 ......... Upstream space partition roller, 34 ......... Downstream space partition roller, 36 ......... Spreading closed space, 38, 40 ......... Discharge line, 41, 42 ......... Lower roller, 44 ......... Upper roller, 46 ......... Spraying closed space, 48 ...... Spraying nozzle.

Claims (7)

In the powder spraying device for rotating the spraying roller disposed in the lower part of the powder storage tank and spraying the powder adhering to the spraying roller to the sprayed material passing under the spraying roller, the sprayed object A space partition roller adjacent to the spray roller is provided upstream and downstream of the spray roller along the flow direction of the spray roller, and a spray closed space is formed immediately below the spray roller. A powder spraying device, which is arranged with a gap and is forcibly rotated . In the powder spraying device for rotating the spraying roller disposed in the lower part of the powder storage tank and spraying the powder adhering to the spraying roller to the sprayed material passing under the spraying roller, the sprayed object A space partition roller is provided on the upstream and downstream sides of the spray roller along the flow direction of the spray roller. The space partition roller is formed immediately below the spray roller to form a spray closed space, and the space partition roller is connected to the spray roller. A powder spraying device, wherein air is forcedly rotated in the direction of entrainment from the gap toward the spraying closed space.   2. The powder spraying apparatus according to claim 1, wherein each of the rollers is a roller having a discharge line attached thereto.   The powder spraying device according to claim 1, wherein the space partition roller has a smoother surface than the spraying roller.   A powder spraying device comprising: a spraying closed space formed by disposing rollers in a stacked state on an upper surface portion of an object to be transported; and a nozzle for spraying powder in the spraying closed space . The bale stacking roller and a pair of lower rollers disposed on the upper surface site of the propagules, according to claim 5, characterized in that it is composed of an upper roller disposed on the lower roller of the pair Powder spreader. The powder spraying device according to claim 5, wherein the nozzle sprays powder from a gap between rollers.

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