Powder loading device

Abstract

The present invention provides a powder loading device that appropriately removes excess powder even when an excessive amount of powder is supplied. [Solution] A powder placement device for placing powder of a predetermined thickness on a strip-shaped substrate, comprising: a conveying unit for conveying the substrate; a strip-shaped material forming unit for forming a powder strip and transferring the powder strip onto the substrate to place powder of a predetermined thickness; a supply unit for supplying powder onto the strip-shaped material forming unit; a thickness defining unit installed closer to the transfer position to the substrate than the supply unit for defining the thickness of the powder strip; and a suction unit for sucking up the powder, wherein the thickness defining unit is positioned at a predetermined distance from the strip-shaped material forming unit and extends in the width direction of the powder strip, intersecting the direction from the supply unit toward the transfer position to the substrate; and the suction unit sucks up at least a portion of the surplus amount of powder obtained by subtracting the amount whose thickness is defined by the thickness defining unit and placed on the strip-shaped material forming unit from the amount supplied by the supply unit.

Description

Technical Field

[0001] The present invention relates to a powder placement device.

Background Art

[0002] The demand for electrochemical devices such as lithium-ion secondary batteries and electric double layer capacitors, which have a high energy density, can be charged and discharged multiple times, and are small and lightweight, is expanding. Lithium-ion secondary batteries have a large energy density and are used in fields such as mobile phones and notebook personal computers. Electric double layer capacitors can be rapidly charged and discharged and are used as small power sources for memory backup in personal computers and the like. With the expansion and development of the applications of these electrochemical devices, further performance improvements such as lower resistance and larger capacity are required.

[0003] The electrodes of such electrochemical devices can be obtained as electrode sheets. For example, powder compression molding is performed to produce a sheet-shaped molded product such as an electrode sheet from a powder containing an electrode active material.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the powder molding apparatuses according to Patent Documents 1 and 2, since a powder storage portion is provided in the opposing portions of two opposing rolls to supply powder, it has been difficult to control the thickness of the powder. Therefore, a method and apparatus are used in which powder is previously supplied onto a base material or a roll, the powder is leveled to a uniform thickness with a plate-like object or a roll, and then the powder is rolled, so that the thickness of the powder is kept constant.

[0006] However, in order to level the powder to a uniform thickness, the amount of powder supplied beforehand must be greater than the amount needed to achieve a uniform thickness; otherwise, some areas will be thinner or some powder will be missing. On the other hand, if too much powder is supplied, the excess powder will accumulate at the plate-like object or roll used to level the thickness, causing problems such as the powder overflowing or spilling over the plate-like object or roll.

[0007] The present invention has been made in view of the above, and its objective is to provide a powder loading device that can appropriately remove excess powder even if an excess amount of powder is supplied. [Means for solving the problem]

[0008] The first powder placement device of the present invention is a powder placement device for placing powder of a predetermined thickness on a strip-shaped substrate, comprising: a conveying unit for conveying the substrate; a strip-shaped material forming unit for forming a powder strip and transferring the powder strip onto the substrate to place the powder of the predetermined thickness; a supply unit for supplying the powder onto the strip-shaped material forming unit; a thickness defining unit installed closer to the transfer position to the substrate than the supply unit for defining the thickness of the powder strip; and a suction unit for sucking up the powder, wherein the thickness defining unit is positioned at a predetermined distance from the strip-shaped material forming unit and extends in the width direction of the powder strip, intersecting the direction from the supply unit toward the transfer position to the substrate; and the suction unit sucks up at least a portion of the surplus amount of powder obtained by subtracting the amount whose thickness is defined by the thickness defining unit and placed on the strip-shaped material forming unit from the amount supplied by the supply unit.

[0009] The suction portion may also suction the powder that is located on the supply side of the thickness-defining portion at the end of the strip-shaped material forming portion in the width direction.

[0010] The second powder placement device of the present invention is a powder placement device for placing powder of a predetermined thickness on a strip-shaped substrate, comprising: a conveying unit for conveying the substrate; a supply unit for supplying the powder onto the substrate; a thickness defining unit installed on the side of the substrate's conveying direction relative to the supply unit for defining the thickness of the powder on the substrate; and a suction unit for sucking up the powder, wherein the thickness defining unit is positioned at a predetermined distance from the substrate and extends in the width direction of the substrate intersecting the conveying direction; and the suction unit sucks up at least a portion of the surplus amount of powder obtained by subtracting the amount of powder whose thickness is defined by the thickness defining unit and placed on the substrate from the amount supplied by the supply unit.

[0011] The suction portion may suck up the powder located on the supply portion side of the thickness-defining portion at the end of the substrate in the width direction.

[0012] In the first or second powder placement device, the suction unit may be positioned above the thickness-defining unit and may suction the powder present on the thickness-defining unit.

[0013] In the first or second powder placement device, the suction unit may be positioned on the supply unit side of the thickness defining unit, and the powder present on the supply unit side of the thickness defining unit may be sucked up.

[0014] The first or second powder placement device may further include a sensor that detects when the excess amount of powder exceeds a predetermined amount. [Effects of the Invention]

[0015] The powder placement device of the present invention uses a suction unit to remove excess powder, thus preventing excess powder from spilling out of the device or settling on the substrate. [Brief explanation of the drawing]

[0016] [Figure 1] This is a schematic side view of a powder placement device according to Embodiment 1. [Figure 2]It is a schematic side view of the powder placement device according to Embodiment 2. [Figure 3] It is a schematic plan view of the powder placement device according to Embodiment 3. [Figure 4] It is a schematic side view of the powder placement device according to Embodiment 4. [Figure 5] It is a schematic side view of the powder placement device according to Embodiment 5. [Figure 6] It is a schematic plan view of the powder placement device according to Embodiment 6.

Embodiments for Carrying out the Invention

[0017] Hereinafter, embodiments of the present invention will be described in detail based on the drawings. The following description of the preferred embodiments is merely illustrative in nature and is not intended to limit the present invention, its applications, or its uses.

[0018] (Embodiment 1) As shown in FIG. 1, the powder placement device according to Embodiment 1 transfers and places a sheet-like powder (powder belt) 81 having a predetermined thickness and a predetermined width placed on a transfer roll (belt-like material forming part) 10 onto a base material 100 conveyed by a backup roll (transport part) 20. In the drawings, the powders 80, the sheet-like powder 81, and the powder layer 82 are hatched so that they can be distinguished at a glance. Thereby, a powder-coated base material provided with a powder layer 82 on the base material 100 is formed. Examples of the powder 80 include powders in which at least a part of the surface of the electrode active material of a secondary battery is coated with a non-aqueous binder. In that case, the base material 100 can be, for example, a metal foil.

[0019] The transfer roll 10 rotates counterclockwise in FIG. 1, and the backup roll 20 rotates clockwise. The powder 80 is supplied and placed on the transfer roll 10 from a hopper (supply part) 200 near the apex of the transfer roll 10. The powder 80 is preferably supplied so that its thickness is larger than that of the sheet-like powder 81 on the transfer roll 10 and its width is about the same.

[0020] The powder 80 is conveyed toward the base material 100 by the transfer roll 10. On the way, it is leveled to a predetermined thickness by the squeegee roll (thickness regulating part) 30 so that the thickness becomes uniform in the width direction and the rotation direction of the transfer roll 10. The squeegee roll 30 is installed between the hopper 200 and the position where the sheet-like powder 81 is transferred to the base material 100. And the squeegee roll 30 extends in the direction intersecting with the rotation direction of the transfer roll 10 (the advancing direction of the powder 80), that is, in the width direction of the sheet-like powder 81. Also, the squeegee roll 30 and the transfer roll 10 face each other with a predetermined interval which is the same length as the predetermined thickness, and this interval is constant in the length direction of the squeegee roll 30.

[0021] The squeegee roll 30 rotates clockwise in FIG. 1, and at the position facing the transfer roll 10, the squeegee roll 30 rotates in the direction in which the transfer roll 10 advances. Also, the peripheral speed of the squeegee roll 30 is larger than the peripheral speed of the transfer roll 10. Due to such a relationship between the squeegee roll 30 and the transfer roll 10, the powder 80 is appropriately compressed, the powder density of the sheet-like powder 81 can be kept constant over time, and the variation in the powder density in the width direction can be suppressed. Therefore, in the sheet-like powder 81, the powder density, in other words, the powder weight per unit area can be kept uniform at all locations in the width direction and the length direction. Also, since the powder density of the sheet-like powder 81 increases, it becomes strong and is prevented from collapsing before being transferred to the base material 100.

[0022] A suction member (suction section) 70 is positioned above the squeegee roll 30. A sensor 90 is installed between the hopper 200 and the suction member 70. The suction member 70 is a component that sucks and removes excess powder (the amount of powder supplied from the hopper 200 per unit time minus the amount of powder that becomes sheet-like powder 81). In this embodiment, the suction member 70 sucks and removes the excess powder that accumulates on the squeegee roll 30. The suction member 70 extends in the width direction of the squeegee roll 30 and has approximately the same length as the squeegee roll 30 in the width direction. A suction port is provided to perform suction over the entire width direction. A suction pipe (not shown) is connected to the suction member 70, and the sucked powder passes through the suction pipe and is discharged to the outside of the suction member 70.

[0023] The sensor 90 detects when the powder 80 has risen onto the squeegee roll 30 (for example, when the amount of powder 80 has increased to a height of 2 / 3 of the diameter of the squeegee roll 30 = predetermined upper limit) and sends a signal to the suction member 70 to start suction, and the suction member 70 receives this signal and starts suction. When the sensor 90 detects that the amount of powder has decreased to an amount that will not cause the powder to rise onto the squeegee roll 30 (for example, an amount that will not actually rise onto the squeegee for 20 seconds = predetermined lower limit), it sends a signal to the suction member 70 to stop suction, and the suction member 70 stops suction. Preferably, the suction speed of the suction member 70 is a speed that sucks up the excess powder little by little. If the suction speed is too high, there is a risk that the powder density will be partially reduced in the sheet-like powder 81, and that there will be fluctuations in the width of the sheet-like powder 81, as well as fluctuations and unevenness in the powder density in the longitudinal direction. Conversely, if it is too low, it will not be possible to suck up and remove all of the excess powder, and the powder will rise onto the squeegee roll 30.

[0024] The sensor 90 senses the position, height (thickness), and amount of powder 80 on the transfer roll 10, specifically the area on the hopper side of the squeegee roll 30 that is in contact with the squeegee roll 30. If suction is started only after the powder has accumulated on the squeegee roll 30, the timing may be delayed, and some of the powder may overflow the squeegee roll 30 and land on the sheet-like powder 81. Therefore, it is preferable that the sensor 90 sends a signal to the suction member 70 slightly before the powder accumulates on the top of the squeegee roll 30. In other words, it is preferable that the sensor 90 senses the amount of powder 80, for example, by its thickness or position on the squeegee roll 30, and sends a signal to the suction member 70 to begin suction when the amount exceeds a predetermined powder thickness.

[0025] In this way, the suction member 70 sucks up any excess powder that accumulates on the squeegee roll 30, preventing the excess powder from overflowing onto the sheet-like powder 81. Therefore, it is possible to prevent unevenness in thickness or weight per unit area caused by a partial increase in the amount of powder on the sheet-like powder 81.

[0026] (Embodiment 2) The powder placement device according to Embodiment 2 differs from Embodiment 1 in the arrangement of the suction member (suction section), the arrangement of the sensor, and the position of the powder to be sensed. Otherwise, it is almost the same as Embodiment 1, so a description of the configuration and structure that differs from Embodiment 1 will be provided.

[0027] As shown in Figure 2, the powder placement device according to Embodiment 2 has a suction member 71 positioned between the squeegee roll 30 and the hopper 200, above the powder 80. The sensor 91 senses the amount (e.g., thickness) of the powder 80 at a position close to the suction member 71 between the suction member 71 and the hopper 200. When the sensor 91 senses that the amount of powder 80 is greater than a predetermined upper limit, it sends a signal to the suction member 71 to start suction. Upon receiving this signal, the suction member 71 begins to suck up the excess powder. When the sensor 91 senses that the amount of powder has decreased to less than a predetermined lower limit, it sends a signal to the suction member 71 to stop suction, and the suction member 71 stops suctioning. The predetermined upper limit is set to a amount slightly less than the amount of powder 80 that would accumulate on the squeegee roll 30. The position of the sensor 91 may be between the suction member 71 and the hopper 200, or between the suction member 71 and the squeegee roll 30.

[0028] The powder placement device of Embodiment 2 provides the same effects as the powder placement device of Embodiment 1.

[0029] (Embodiment 3) The powder placement device according to Embodiment 3 differs from Embodiment 1 in the structure and arrangement of the suction member (suction section) and the placement position of the sensor and the position of the powder to be sensed. Otherwise, it is almost the same as Embodiment 1, so a description of the configuration and structure that differs from Embodiment 1 will be provided.

[0030] In the powder placement device according to Embodiment 3, as shown in Figure 3, the suction member 72 is installed between the squeegee roll 30 and the hopper 200, on the end side in the width direction of the transfer roll 10. Note that Figure 3 is a view of the device from above. The suction member 72 does not have approximately the same length as the squeegee roll 30 in the width direction, but is configured to suck up powder from the end side in the width direction, which is different from Embodiment 1.

[0031] The sensor 92 senses the amount of powder 80 at the widthwise end of the suction member 72, close to the suction member 72, between the suction member 72 and the hopper 200 (for example, thickness or amount of overflow in the widthwise direction). When the sensor 92 senses that the amount of powder 80 is greater than a predetermined upper limit, it sends a signal to the suction member 72 to start suction. Upon receiving this signal, the suction member 72 begins to suck up the excess powder. When the sensor 92 senses that the amount of powder has decreased to less than a predetermined lower limit, it sends a signal to the suction member 72 to stop suction, and the suction member 72 stops suction. The predetermined upper limit can be set to a predetermined amount of powder 80 at the widthwise end of the transfer roll 10, for example, the amount that exceeds the upper limit of the width setting for the sheet-like powder 81, or the amount just before the powder overflows from the side of the transfer roll 10.

[0032] The suction member 72 preferably has a suction speed that gradually sucks up the excess powder. If the suction speed is too high, the width of the sheet-like powder 81 may become smaller or the powder density at the edges may decrease, and conversely, if it is too low, it may not be possible to suck up and remove all of the excess powder.

[0033] The powder placement device of Embodiment 3 can prevent the amount of powder at the widthwise end from exceeding a set limit, thereby maintaining the width of the sheet-like powder at a predetermined width, and can also prevent the powder from spilling out from the side of the transfer roll.

[0034] (Embodiment 4) The powder placement device according to Embodiment 4, as shown in Figure 4, is a device in which the base material 100 is conveyed to the right side of the figure by conveying rolls (conveying sections) 51, 52, and 53. First, powder 80 is placed directly onto the base material 100 from the hopper 200. Then, the powder 80 is transformed into a sheet-like powder 81 of a predetermined thickness and width on the base material 100 by a squeegee roll 32, which is a thickness-defining section with the same configuration and structure as Embodiment 1. Furthermore, the sheet-like powder 81 is compressed into a powder layer 85 by a compression roll 60.

[0035] Similar to Embodiment 1, hatching is applied to the powder 80, sheet-like powder 81, and compressed powder layer 85 in the drawings to facilitate explanation. This forms a powder-coated substrate with a compressed powder layer 85 on the substrate 100. As for the powder 80, similar to Embodiment 1, for example, a powder in which at least a portion of the surface of the electrode active material of a secondary battery is coated with a non-aqueous binder can be cited. In that case, the substrate 100 can be, for example, a metal foil. The following explanation will focus on the differences from Embodiment 1, and the same configurations and structures as in Embodiment 1 may be omitted.

[0036] First, powder 80 is supplied to the base material 100 from the hopper 200 and placed on top. When the powder 80 is placed on the base material 100, it is preferable that it is supplied in such a way that it is thicker than the sheet-like powder 81 but has approximately the same width.

[0037] The powder 80 is carried towards the compression roll 60 by the base material 100, but along the way it is leveled to a predetermined thickness by the squeegee roll 32 so that the thickness is uniform in both the width direction and the direction of travel. The squeegee roll 32 is in a direction that intersects the conveying direction of the base material 100 and extends in the width direction of the sheet-like powder 81. The squeegee roll 32 and the base material 100 face each other with a predetermined distance that is equal to the predetermined thickness, and this distance is constant in the length direction of the squeegee roll 32.

[0038] A suction member (suction section) 73 is positioned above the squeegee roll 32. A sensor 93 is installed between the hopper 200 and the suction member 73. The suction member 73 is a component that sucks and removes excess powder (the amount of powder supplied from the hopper 200 per unit time minus the amount of powder that becomes sheet-like powder 81). In this embodiment, the suction member 73 sucks and removes the excess powder that accumulates on the squeegee roll 32. The suction member 73 extends in the width direction of the squeegee roll 32 and has approximately the same length as the squeegee roll 32 in the width direction. A suction port is provided to perform suction over the entire width direction. A suction pipe (not shown) is connected to the suction member 73, and the sucked powder passes through the suction pipe and is discharged to the outside of the suction member 73.

[0039] Similar to Embodiment 1, the sensor 93 detects when powder has accumulated on the squeegee roll 32 (for example, when the amount of powder 80 has increased to a height of 2 / 3 of the diameter of the squeegee roll 32 = predetermined upper limit) and sends a signal to the suction member 73 to start suction. The suction member 73 receives this signal and starts suction. When the sensor 93 detects that the amount of powder has decreased to an amount that will not accumulate on the squeegee roll 32 (for example, an amount that will not actually accumulate for 20 seconds = predetermined lower limit), it sends a signal to the suction member 73 to stop suction, and the suction member 73 stops suction. It is preferable that the suction member 73 suctions at a speed that gradually sucks up the excess powder. If the suction speed is too high, there is a risk that the powder density will be partially reduced in the sheet-like powder 81, and that there will be fluctuations in the width of the sheet-like powder 81, as well as fluctuations and unevenness in the powder density in the longitudinal direction. Conversely, if it is too low, it will not be possible to suck up and remove all of the excess powder, and the powder will accumulate on the squeegee roll 32.

[0040] The sensor 93 senses the position, height from the substrate 100, and amount of powder 80 on the substrate 100, specifically the area on the hopper side of the squeegee roll 32 that is in contact with the squeegee roll 32. Preferably, the sensor 93 sends a signal to the suction member 73 to start suction slightly before the powder accumulates on top of the squeegee roll 32. In other words, it is preferable that the sensor 93 senses the amount of powder 80, for example, by its thickness or position on the squeegee roll 32, and sends a signal to the suction member 73 to start suction when it exceeds a predetermined thickness and position.

[0041] In this way, the suction member 73 sucks up any excess powder that accumulates on the squeegee roll 32, preventing the excess powder from overflowing onto the sheet-like powder 81. Therefore, it is possible to prevent unevenness in thickness or weight per unit area caused by a partial increase in the amount of powder in the sheet-like powder 81.

[0042] (Embodiment 5) The powder placement device according to Embodiment 5 differs from Embodiment 4 in the arrangement of the suction member (suction section), the arrangement of the sensor, and the position of the powder to be sensed. Otherwise, it is almost the same as Embodiment 4, so a description of the configuration and structure that differs from Embodiment 4 will be provided.

[0043] As shown in Figure 5, the powder placement device according to Embodiment 5 has a suction member 74 positioned between the squeegee roll 32 and the hopper 200, above the powder 80. The sensor 94 senses the amount (e.g., thickness) of the powder 80 at a position close to the suction member 74 between the suction member 74 and the hopper 200. When the sensor 94 senses that the amount of powder 80 is greater than a predetermined upper limit, it sends a signal to the suction member 74 to start suction. Upon receiving this signal, the suction member 74 begins to suck up the excess powder. When the sensor 94 senses that the amount of powder has decreased to less than a predetermined lower limit, it sends a signal to the suction member 74 to stop suction, and the suction member 74 stops suctioning. The predetermined upper limit is set to a amount slightly less than the amount of powder 80 that would accumulate on the squeegee roll 32. The position of the sensor 94 may be between the suction member 74 and the hopper 200, or between the suction member 74 and the squeegee roll 32.

[0044] The powder placement device of Embodiment 5 provides the same effects as the powder placement device of Embodiment 4.

[0045] (Embodiment 6) The powder placement device according to Embodiment 6 differs from Embodiment 4 in the structure and arrangement of the suction member (suction section) and the position of the powder detected by the sensor, but is otherwise almost the same as Embodiment 4. Therefore, a description of the configuration and structure that differs from Embodiment 4 will be provided.

[0046] As shown in Figure 6, the powder placement device according to Embodiment 6 has a suction member 75 installed between the squeegee roll 32 and the hopper 200, on the end side in the width direction of the base material 100. Figure 6 is a view of the device from above. The suction member 75 does not have approximately the same length as the squeegee roll 32 in the width direction, but is configured to suck up powder from the end side in the width direction, which is different from Embodiment 4.

[0047] The sensor 95 senses the amount of powder 80 at the widthwise end of the suction member 75, close to the suction member 75, between the suction member 75 and the hopper 200 (for example, thickness or amount of overflow in the widthwise direction). When the sensor 95 senses that the amount of powder 80 is greater than a predetermined upper limit, it sends a signal to the suction member 72 to start suction. Upon receiving this signal, the suction member 75 begins to suck up the excess powder. When the sensor 95 senses that the amount of powder has decreased to less than a predetermined lower limit, it sends a signal to the suction member 75 to stop suction, and the suction member 75 stops suction. The predetermined upper limit can be set to a predetermined amount of powder 80 at the widthwise end of the base material 100, for example, the amount that exceeds the upper limit of the width setting for the sheet-like powder 81, or the amount just before the powder overflows from the side of the base material 100.

[0048] It is preferable for the suction member 75 to gradually suck up the excess powder. If the suction speed is too high, the width of the sheet-like powder 81 may decrease, or the powder density at the edges may decrease. Conversely, if it is too low, it may not be possible to suck up and remove all of the excess powder.

[0049] The powder placement device of Embodiment 6 can prevent the amount of powder at the widthwise ends from exceeding a set amount, thereby maintaining the width of the sheet-like powder at a predetermined width, and can also prevent the powder from spilling out from the sides of the base material.

[0050] (Other embodiments) The embodiments described above are illustrative examples of the present invention, and the present invention is not limited to these examples. These examples may be combined with or partially replaced with well-known, conventional, or prior art. Modified inventions that would be easily conceived by a person skilled in the art are also included in the present invention.

[0051] The thickness-regulating section is not limited to a roll. For example, it may be a plate-like object installed at a predetermined distance from the transfer roll (strip-forming section) or the base material.

[0052] The suction structure of the suction member is not particularly limited. The suction port may have a number of holes arranged in a row, or it may be a slit-shaped suction port, and the orientation of the suction port is not particularly limited. It may also have a structure that is divided into multiple sections with different suction forces in the width direction.

[0053] The sensor may be mounted on top of the suction member. Multiple sensors may be installed in a single powder placement device. In embodiments 1, 2, 4, and 5, the sensor may be installed to the side of the transfer roll to sense the thickness of the powder from the side. The sensor may be a laser sensor or an image sensor, and the type of sensor is not limited.

[0054] In embodiments 2 and 5, the sensor may be configured to sense the amount of powder that rides up onto the squeegee roll.

[0055] All of Embodiments 1, 2, and 3, or any two of them, may be used. All of Embodiments 4, 5, and 6, or any two of them, may be used.

[0056] Excess powder is moved further towards the ends of the transfer roll by restricting both ends of the powder on the transfer roll so that they are the same width as the sheet-like powder, and an end suction member is installed to suck up the excess powder, and this configuration may be combined with embodiments 1 and 2.

[0057] Excess powder is moved further towards the ends of the substrate by restricting the ends of the powder on the substrate so that they are the same width as the sheet-like powder, and an end suction member is installed to suck up the excess powder, and this form may be combined with embodiments 4 and 5. [Explanation of Symbols]

[0058] 10 Transfer roll (strip-shaped material forming section) 20 Backup roll (transport section) 30,32 Squeegee roll (thickness control section) 51, 52, 53 Conveyor rolls (conveyor section) 70, 71, 72 Suction member (suction part) 73, 74, 75 Suction member (suction part) 80 powder 81. Sheet-like powder (powder strip) 90, 91, 92 sensors 93, 94, 95 Sensors 100 Base material 200 hoppers (supply section)

Claims

1. A powder placement device that places powder of a predetermined thickness on a strip-shaped substrate, A conveying unit for conveying the aforementioned substrate, A strip-shaped material forming section is used to form a powder strip and transfer the powder strip onto the substrate to place the powder of a predetermined thickness on the substrate. A supply unit for supplying the powder onto the strip-shaped material forming unit, A thickness defining section is installed closer to the transfer position to the substrate than the supply section, and defines the thickness of the powder strip. A suction unit for sucking up the powder and It has, The thickness-defining portion is positioned at a predetermined distance from the strip-forming portion and extends in the width direction of the powder strip, intersecting the direction toward the transfer position from the supply portion to the substrate. The suction unit sucks up at least a portion of the surplus amount of the powder, which is obtained by subtracting the amount whose thickness is defined by the thickness defining unit and placed on the strip-shaped object forming unit from the amount supplied by the supply unit.

2. A powder placement device that places powder of a predetermined thickness on a strip-shaped substrate, A conveying unit for conveying the aforementioned substrate, A supply unit that supplies the powder onto the substrate, A thickness defining unit is installed on the side of the substrate's transport direction relative to the supply unit, and defines the thickness of the powder on the substrate. A suction unit for sucking up the powder and It has, The thickness-defining portion is positioned at a predetermined distance from the base material and extends in the width direction of the base material, intersecting the conveying direction. The suction unit sucks up at least a portion of the surplus amount of the powder, which is obtained by subtracting the amount of powder whose thickness is defined by the thickness defining unit and placed on the substrate from the amount supplied by the supply unit.

3. The powder placement device according to claim 1 or 2, wherein the suction unit is positioned above the thickness-defining unit and sucks up the powder present on the thickness-defining unit.

4. The powder placement apparatus according to claim 1 or 2, wherein the suction unit is positioned on the supply unit side of the thickness defining unit and sucks up the powder that is located on the supply unit side of the thickness defining unit.

5. The powder placement device according to claim 1, wherein the suction portion sucks up the powder located on the supply side of the thickness-defining portion at the end of the strip-shaped material forming portion in the width direction.

6. The powder placement apparatus according to claim 2, wherein the suction portion sucks up the powder located on the supply side of the thickness-defining portion at the end of the substrate in the width direction.

7. The powder placement device according to claim 1 or 2, further comprising a sensor that detects when the excess amount of the powder exceeds a predetermined amount.

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