KR20190022413A - Device and method for conveying a powder, in particular as a component of a coating device - Google Patents

Abstract

The present invention relates to a device and a method for conveying powder (4) as a conveying element (11) guided by guiding elements (12, 12′), wherein the powder (4) is used for guiding the conveying element (11). The conveying element (11) is a disk especially supported by a hub. A gap filled with the powder is positioned between the hub and the disk, and is opened for a storage volume. However, the conveying element (11) can also be a screw.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a device and a method for transferring a powder, particularly as a component of a coating device. BACKGROUND OF THE INVENTION [0002]

[0001] The present invention relates to a method for conveying a powder to a conveying element, which is guided by a guide element. In particular, the transfer element has a receiving means for receiving the powder to be conveyed, and the receiving means receives the powder at a loading station. The powder flows out of the receiving means at the unloading station.

[0002] DE 295 10 210 U1 describes a conveying device with a conveying screw, wherein screw flights are spaced from the wall of the screw guide. A brush-shaped sealing means protruding from the face surfaces of the screw blades and contacting the guide wall is provided.

[0003] DE 89 14 389 U1 describes a similar screw conveyor.

[0004] DE 19 47 405 describes a dosing device with a dosing disc which has transfer receiving openings and is mounted on a base plate. The powder may be deposited between the base plate and the dosing disk and the powder is removed through a gap in the base plate.

[0005] CN 201737998 U discloses a dosing device in which the powder in the unloading station flows out of the receiving means at a substantially constant mean conveying speed. A rotatable disk is arranged in the housing. A plurality of dosing openings are arranged on the arc line about the rotational axis of the disc. The dosing openings form windows that open in the loading station toward the wide side surface of the disc such that the powder stored in the storage volume can enter the dosing openings. Through the circular rotational movement of the disk, the powder is directed to the unloading station, where the powder is transported outward from the dosing opening by the fluid flow.

[0006] A previously disclosed DE 10 2017 106 500 A1 discloses a similar device. DE 10 2011 051 263 A1 discloses a comprehensive delivery device in the form of a screw, which is rotatably mounted on a housing. The housing forms a guide element and the screw forms a transfer element. The intermediate space arranged between the helical screw blades forms a receiving means for conveying the powder.

[0007] Additional administration devices are disclosed in US 5,615,830, CN 201136896 and CN 201158707.

[0008] The present invention is based on the problem of improving the device for conveying powder with respect to the accuracy of the conveying speed and it shows how the powder can be guided from the loading station to the unloading station at a more specific conveying speed.

[0009] These problems are solved by the invention as set forth in the claims, and the dependent claims are not only additional advantageous embodiments of the present invention as set forth in the main claims, but also provide unique solutions to the problem.

[0010] First and in essence, it is proposed that the powder be used during the guidance of the transfer element. The guide element and the transfer element are configured such that the powder is used to guide the transfer element and is here spatially related to each other. In particular, the transfer element forms a first bearing surface, and the guiding element forms a second bearing surface. A gap is located between the two bearing surfaces and the gap is filled with powder. In particular, it is provided that the transport element is rotatably driven. The guiding element may co-rotate with the transfer element. However, the guiding element may also be stationary relative to the transport element. When mounting the transfer element within the powder, the concentricity of the rotational movement of the transfer element is preferably improved.

[0011] In the case of hydrodynamic bearings, powders are used as bearing materials, according to the invention, similar to sliding bearings where oils or gases are used as self-lubricating bearing materials. To this end, in particular, the gap filled with the powder for supporting the transfer element is opened towards the storage volume so that the powder stored in the storage volume can enter into the gap between the guide element and the transfer element Is provided.

[0012] In particular, the transfer element is a circular or annular disk, and the receiving means is configured to receive the powder from the delivery chambers arranged on the arc line. The administration chambers may be surrounded by four chambers and may have a circular cross-section. However, the administration chambers may also be opened towards the edge of the transfer element. The disk forming the transfer element is mounted on the bearing surface. To this end, the disc is placed so that a wide side surface is on the bearing surface. The wider side surface of the opposite side of the disc is subjected to a force by a contact-pressing device, e.g., spring elements, such that the disc is placed on the bearing surface under force. The administration chambers are particularly open towards the disc on both wide side surfaces. In the loading station, the administration chambers are open only towards the storage volume. The window-shaped administration chamber is closed rearward by the bearing surface. In the unloading station, the administration chambers are open to both sides. Emptying the administration chamber at the unloading station is preferably by fluid flow through the administration chamber. The guiding element can be a hub on which the annular disc forming the transport element can rotate around. In order to rotatably drive the transfer element, a rotary drive means is preferably provided. To this end, a circular electric motor may be provided. The rotary motion can be transmitted to the transfer element by a toothed wheel, toothed belt, or the like. The bearing surfaces of the guiding element and the transferring element can extend over the arc lines so that the gap between the transferring element and the guiding element becomes a circular annular gap. In a further refinement of the invention, the guiding element may be provided as a circumferential ring surrounding the conveying element. The transfer element may be further provided mounted between the circumferential ring and the hub, wherein the transfer element has two bearing surfaces each extending over the arc line and each forming an edge of the bearing gap filled with powder. In a variant of the invention, it is provided that the guide element or one of the several guide elements is rotated simultaneously with the transport element. The clearance between the guiding element and the transport element which is then filled with powder during operation of the device is then preferably extended on a line that is not rotationally symmetric. This can be a toothed profile line. The toothed portions of the guiding element can be coupled to the toothed gaps of the transfer element, and a gap filled with powder is formed between the toothed portions and the toothed gaps. The disc may have a thickness that can, at least in the region of the administration chambers, have a material thickness of less than 0.5 mm. However, at a radial distance from the administration chambers, the disc may also be thicker, and in particular may have a thickness of a few millimeters. This gives greater stability to the disk forming the transport element. A transfer disc, in particular provided with delivery chambers which are in the form of annular or circular discs and in particular with circular contours, is pressed against the reference surface by spring elements forming a contact pressure device, wherein the reference surface is a bearing surface. Drive means are provided for rotating the transfer disc relative to the rotational axis. The powder filled gap between radially inwardly or radially outwardly positioned guide elements causes dynamic centering of the transfer disc in accordance with the law of minimum bearing energy. During rotary motion, some pressure forces are created between the bearing surfaces of the transfer element and the guiding element, which can compensate for imbalances. The powder acts with a certain degree of radial forces on the transfer element, and the rotational motion, especially the shear motion, between the bearing surfaces can cause compression of the powder. Similar effects to hydrodynamic bearings occur. However, unlike hydrodynamic bearings, here the transported medium, and hence the powder, is used simultaneously as a bearing medium. It is particularly advantageous here that the powder acts as a viscous liquid in the bearing clearance, so to speak. The average particle size (equivalent sphere diameter) of the powder is in particular less than 1 mm, less than 100 m, or less than 50 m. The gap width is particularly less than 1 mm, less than 0.5 mm, less than 0.2 mm, or less than 0.1 mm. However, the gap width is at least 2, 5 or 10 times larger than the average equivalent diameter of the powder. Variations of the invention each relate to a transfer device, or a method for operating such a transfer device, wherein the transfer element is a transfer screw mounted within the housing. The screw blades have bearing surfaces that project radially outwardly away from the inner wall of the bearing housing by a predetermined gap. During rotation of the screw, this gap is filled with the powder to be transferred, where the powder performs the function of centering the position of the screw. It is additionally provided that the cylindrical section of the screw, in particular the circular-cylindrical bearing section, is mounted on the bearing bore. The cylindrical surface of the cylindrical screw section is radially spaced from the cylindrical surface of the bearing bore. According to the present invention, a gap filled with powder is formed, whereby the rotational motion of the screw in the housing is stabilized. By means of the screw, in particular by the intermediate space between the screw blades, the powder is transferred from the loading station to the unloading station. Here again, as in the variant in which the transfer element is configured to be disc-shaped, the volume flow rate of the transferred powder is also determined by the rotational speed of the transfer element.

[0013] The present invention is described in detail below with the aid of exemplary embodiments.
Figure 1 shows a schematic cross-sectional view of a first exemplary embodiment.
Fig. 2 shows a plan view in the direction of the arrow II in Fig. 1, on the conveying element and the guiding element shown therein.
Figure 3 shows a view according to Figure 2 of a second exemplary embodiment.
Figure 4 shows a view according to Figure 2 of a third exemplary embodiment.
Figure 5 shows a view according to Figure 1 of a fourth exemplary embodiment.
Figure 6 shows a view according to Figure 2 of a fourth exemplary embodiment.
Figure 7 shows a view according to Figure 2 of a fifth exemplary embodiment.
Figure 8 shows a view according to Figure 2 of a sixth exemplary embodiment.
Figure 9 shows a view of a seventh exemplary embodiment in which the transport element is a transport screw, as described in DE 10 2011 051 263 A1.

[0014] The transport device shown in the figures serves to administer the organic-initiated material in powder form for use in the manufacture of OLEDs. With this device, a mass flow or a volumetric flow of a constant powder will be produced over time, wherein the powder is conveyed to the evaporator as an aerosol by means of a fluid stream, in particular an inert gas stream. The evaporator has heat transfer surfaces, where heat is transferred to the fluid and / or powder particles by the heat transfer surfaces, and the powder evaporates in the evaporator. With the fluid flow, the vapor is transferred to the coating device through the heating supply line, the coating device having a gas inlet element through which the vapor enters the process chamber. The vapor exiting the heated gas inlet element condenses on the substrate lying in the cooled substrate holder. The substrate may be a transparent sheet, in particular a glass plate. Such devices are disclosed in DE 10 2015 118 765 A1 or DE 10 2015 101 461 A1. Evaporation devices for powder evaporation are known in particular from WO < RTI ID = 0.0 > 2012/175128 < / RTI > The contents of these publications are incorporated herein by reference in their entirety.

[0015] Figures 1 and 2 show a rough schematic cross-sectional view of a dosing device for administration of powders.

[0016] The storage volume 1 is delimited by the walls 5, 5 '. The powder (4) is stored in the storage volume (1). The base of the storage volume portion 1 has an administration element 2 which is an element having a circular disk shape. The dosing element (2) has a transfer element (11) and a guiding element (12). The guiding element 2 is arranged in the center and forms a rotary shaft 10 on which the conveying element 11 is rotatable. The guiding element 12 has the shape of a circular disk. The transfer element 11 has the shape of an annular disc. The windows opening on both sides are arranged on the arc line at a uniform distance concentrically with respect to the rotary shaft 10. [ The windows form dosing chambers 3. The annular disc forming the transfer element 11 has a maximum material thickness of 0.5 mm.

[0017] There are provided contact pressure devices 6 capable of developing a force acting in the direction of the rotary shaft 10. [ This force is exerted on the wide side surface of the transfer element 11 pointing to the storage volume 1. The wider side surface of the opposite side of the transfer element 11 rests flat against the bearing surface 9 of the bearing body 9 '. A total of four contact pressure points are provided and at the contact pressure points the contact pressure device 6 is pressed against the wide side surface of the transfer element 11 which is here configured as a transfer disc. The contact pressure device 6 may have a tension spring for generating a contact pressure.

[0018] In the loading station, the opening of the dosing chamber 3, which points to the bearing surface 9 ', is closed by the bearing surface 9. The opening on the opposite side of the administration chamber 3 is opened toward the storage volume portion 1 so that the powder 4 stored in the storage volume portion 1 can enter into the administration chamber 3.

[0019] At the unloading station, the fluid duct (7) is opened to the outside. Fluid can flow through the fluid duct 7 to transfer the powder 4 contained in the dosing chamber 3 into the outlet opening 8 and the outlet opening 8 can flow through the delivery chamber 3 and the fluid duct 7). The fluid is preferably an inert gas, whereby the aerosol can flow through the outlet opening 8.

[0020] Preferably, the gap 13 with a gap width of less than 1 mm extends between the seating guide element 12 formed by the central disc in the exemplary embodiment and the transfer element 11 formed by the annular disc. The transfer element 11 forms a bearing surface 18 that extends over an arc line around the axis of rotation 10. The guide element 12 forms a bearing surface 19 lying on the opposite side of the bearing surface 18 and spaced from the bearing surface 18 by a gap width. The transfer element 11 is rotatably driven about a rotary shaft 10 by means of a rotary drive means not shown so that the first bearing surface 18 performs a shear motion with respect to the second bearing surface 19. The gap 13 between the first bearing surface 18 and the second bearing surface 19 is filled with powder. To this end, the gap 13 is opened towards the storage volume 1, allowing the powder 4 to enter the gap 13 from the storage volume 1, where the powder is deposited as hydrodynamic bearing means .

[0021] The exemplary embodiment shown in FIG. 3 is essentially similar to the exemplary embodiment shown in FIGS. 1 and 2 in that the gaps 13 extend on a line, rather than on an arc line, Which is different from the embodiment. Here again, the transfer element 11 formed by a similarly flat disk forms a first bearing surface 18 pointing to the gap 13. This bearing surface 18, however, extends over the outer edges of the tooth gap or on the teeth that are arranged between the tooth gap, respectively.

[0022] In this exemplary embodiment, the guiding element 12, which rotates synchronously with the transfer element 11, similarly has a bearing surface 19. Here, the bearing surface 19 also extends over the toothed ring line, so that the teeth of the guide element 12 engage the tooth gaps of the transfer element 11. However, the bearing surfaces 18, 19 are spaced apart from each other by a gap width 13. The gap is filled with powder.

[0023] In the exemplary embodiment shown in FIG. 4, an additional gap 13 'is provided which extends between the radially outer guiding element 12 and the radially inner guiding element 12'. Otherwise, the third exemplary embodiment shown in FIG. 4 essentially corresponds to the first exemplary embodiment shown in FIGS. 1 and 2.

[0024] Fig. 5 shows a fourth exemplary embodiment of the example according to Fig. 1, in which the transport element 11 has the shape of a circular disc. A bearing clearance 13 for the rotational bearing of the transfer element 11 is formed radially outwardly of the transfer element 11 and extends on an arc line. The radially outwardly arranged guide element 12 has an annular shape with a radially inwardly directed bearing surface 19 lying on the opposite side of the radially outwardly directed bearing surface 18 of the transfer element 11 . The two bearing surfaces 18, 19 are spaced apart by the gap width of the gap 13, which is filled with powder.

[0025] Here again, the contact pressure device 6 is provided so as to act on the transfer element 11 in the region of the axis 10 relative to the bearing surface 9 of the bearing body 9 '.

[0026] The exemplary embodiment shown in FIG. 7 is essentially a disc having a circular ring shape in which the transfer element 11 is rotatably mounted through both the radially outer gap 13 and the radially inner gap 13 ' And differs from the exemplary embodiment shown in Figs. To this end, a second guiding element 12 'is provided which is located in the center of the circular disc shaped opening of the conveying element 11. The two gaps 13, 13 'are each filled with a powder 4.

[0027] In the exemplary embodiment shown in Fig. 8, unlike the previously described exemplary embodiments, the dosing chambers 3 are not surrounded all around, but rather at the radially outer edge of the transfer element 11 Lt; / RTI > Here, a radially inwardly spaced gap 13 is provided which extends around a central guiding element 12 having the shape of a circular disc. The radially outer boundary line of the transfer element 11 has the tooth shape of the tooth wheel, and the tooth gaps of this tooth form the injection chambers 3. The radially outwardly facing tooth heads form bearing surfaces 18 'that lie on opposite sides of the bearing surfaces 19' formed by the ring-shaped guide element 12 '. Thus, a second gap 13 'filled with powder extends between the bearing surfaces 18' and 19 '.

[0028] The exemplary embodiment shown in Fig. 9 shows a differently configured transfer element 11. The transfer element 11 is formed by a screw having a cylindrical bearing section 17 which is here mounted on a bearing bore. Here the bearing bore forms a guide element 12 having a bearing surface 19 which forms the wall of the gap 13 lying opposite the gap wall 18 defined by the cylindrical section 17. Here, the clearance 13 is opened toward the inside of the housing 16. The housing 16 has an opening towards the storage volume 1 through which the powder can enter the housing cavity of the housing 16. The powder can also enter the gap 13.

[0029] The screw has a screw blade 14, and an intermediate space 15 extends between the screw blades, the intermediate space being filled with powder during rotation of the screw so that the powder can be carried to the unloading station.

[0030] The outer radial outer face surfaces of the screw vanes 14 form bearing surfaces 18 'that are spaced from the bearing surfaces 19' by a gap 13 ' 19 'are formed by the inner cylindrical cavity of the housing 16. Here, the gap 13 'is filled with powder.

[0031] The powder used in accordance with the present invention is an organic powder such as that used in the manufacture of OLEDs. The powder forms a viscous mass that can flow differently into the gap 13 due to the rotational movement of the bearing surfaces 18, 19, in order to develop a rotation-stabilizing effect on the transfer element 11. The powder has particles having an average particle size corresponding to a sphere-equivalent diameter of 10 to 200 mu m. The preferred particle diameter is 50 占 퐉. The height of the gap extending parallel to the rotation axis of the transfer element 11 ranges from 1,500 mu m to 3,000 mu m. However, it can also range from 500 [mu] m to 1,000 [mu] m. The width of the gap preferably ranges from 500 mu m to 1,000 mu m. However, it can also range from 1,500 mu m to 3,000 mu m. The volume of the administration chamber 3 is selected to accommodate 0.5 mg of powder. Preferably, the diameter of the administration chamber 3 ranges from 600 to 1,500 mu m. The height of the administration chamber 3 can range from 200 [mu] m to 500 [mu] m. Preferably, the ratio of diameter / height is 3/1.

[0032] Similarly, the gap filled with powder has a height / width ratio of 3/1. However, it is also possible that the width / height ratio is 3/1.

[0033] When using powders having a larger particle diameter, for example, a particle diameter of 200 mu m, larger gap widths are used, and the gap width increases in proportion to the particle diameter. However, the height of the gap remains the same.

[0034] When particles having diameters smaller than the preferred particle diameter of 50 mu m, for example particles having a diameter of 10 mu m, are used, measurements on gap width and gap height are unchanged.

[0035] The foregoing description serves to illustrate the invention as embraced by the present application as a whole, and these inventions further independently improve the prior art, through combinations of at least the following features, , Several, or all of them can also be combined, i.e.:

[0036] Wherein a powder (4) is used to guide the transfer element (11).

[0037] The guide elements 12 and 12 'and the transfer element 11 are constructed such that the powder 4 is used to guide the transfer element 11 and is spatially related to each other.

[0038] Wherein the transfer element (11) has a receiving means (3, 15) for the temporary acceptance of the powder (4).

[0039] Wherein the transfer element 11 is a flat, in particular ring-shaped, disk and the guiding element 12, 12 'is a circumferential ring which carries a hub and / or disk supporting the disk.

[0040] Wherein the transfer element is a screw and the guide element is a bearing for supporting a cylindrical section of the screw and / or housing for supporting the screw.

[0041] The guide elements 12 and 12 'and the transfer element 11 have bearing surfaces 18, 18', 19 and 19 'which are spaced apart from each other by gaps 13 and 13' Is filled with the powder (4).

[0042] Wherein the bearing surfaces 18,18'of the transfer element 11 are moved relative to the bearing surfaces 19,19'of the guide surfaces 12,12'16.

[0043] Wherein the gap 13 between the bearing surfaces 18, 18, 19 and 19 'and the receiving means 3 are at least partly open to the storage volume 1 of the powder 4.

[0044] The powder 4 received by the receiving means 3 with the transport element 11 which is driven to move is guided from the loading station to the unloading station where the powder 4 is respectively taken out of the receiving means 3 A method or device that exits or exits.

[0045] The receiving means 3 are in particular the delivery chambers arranged in the form of a circular ring about the axis of rotation 10 and / or the receiving means 3 are formed by means of an intermediate space 15 between the screw blades 14 Method, or device.

[0046] The transfer element 11 is actuated against the bearing surface 9 by the force of the contact pressure device 6 and in particular the first wide side surface of the disc- Wherein a second wide side surface lying on the opposite side of the first wide side surface is provided lying flat on the bearing surface (9).

[0047] All the disclosed features (by themselves, but also in combination with one another) are essential to the present invention. In addition, the disclosures of related / attached priority documents (copies of prior applications) are also entirely incorporated into the disclosure of this application for the purpose of including the features of these documents within the scope of the present application. The dependent claims also characterize the independent inventive further improvements of the prior art by means of these features, without the features of the recited claims, in particular in order to commence the divisional applications based on these claims. The invention as recited in each claim may additionally have one or more of the features shown in the above description, in particular as provided by reference numerals and / or in the list of reference numerals. The present invention may also be practiced as long as individual ones of the features mentioned in the above description can be replaced by other means which are perceptibly unnecessary or have technically the same effect for each use purpose, But also to the types of configurations that are not being addressed.

1 storage volume
2 administration factor
3 administration chamber
4 powder
5 Walls
5 'wall
6 contact pressure device
7 Fluid duct
8 outlet opening
9 Bearing surface
9 'bearing body
10 rotary shaft
11 Feed elements
12 guide elements
12 'guide element
13 Clearance
13 'Clearance
14 Screw wing
15 intermediate space
16 housing
17 Bearing Section
18 Bearing surface
18 'bearing surface
19 Bearing surface
19 'bearing surface

Claims (11)

A method for conveying a powder (4)
(12) arranged in a torque-proof manner in a rotatable or torque-proof manner with respect to the housing (9 ', 5) about the rotary shaft (10) And conveying the powder 4 to a conveying element 11 arranged radially inwardly or radially outwardly of the guide element 12, 12 'with respect to the rotary shaft 10, In addition,
The conveying element 11 is associated with the guide element 12, 12 'rotatable with respect to the housing 9', 5 in a torque-torque manner and / or with respect to the housing 9 ' A torque-resistant adult is rotatably associated with said guiding element (12, 12 '),
Wherein a gap 13 which is arranged between the guide element 12 and 12 'and the transfer element 11 surrounding the rotary shaft 10 is filled with the powder 4,
A method for transferring powder. The method according to claim 1,
The powder 4 is used as a sliding material for supporting the transfer element 11 on the guide element 12 or 12 'connected to the housing 9' felled,
A method for transferring powder. 3. The method of claim 2,
The transfer element 11 is a ring-shaped disc and the guide elements 12 and 12 'are connected to a hub for supporting the disc and / or to a circumferential direction A circumferential ring,
A method for transferring powder. 3. The method of claim 2,
Wherein the conveying element is a screw and the guide element is a bearing for supporting a cylindrical section of the screw,
A method for transferring powder. 3. The method of claim 2,
The powder 4 received by the receiving means 3 with a transportably driven transport element 11 is led from a loading station to an unloading station, (3), and an outlet
A method for transferring powder. A device for transferring powder (4)
(12, 12 ') arranged in a rotatable or torque-resistant manner with respect to the housing (9', 5) about a rotary shaft (10) for conveying the powder in the conveying direction, , And a transfer element (11) arranged radially inward or radially outward of the guide element (12, 12 ') with respect to the rotary shaft (10), the transfer element Is torque-wise associated with said guide element (12, 12 ') rotatably associated with said housing (9', 5) and / or in a torque- Is rotatably associated with the guiding element (12, 12 '),
When the transfer element 11 is rotatably associated with the guiding element 12, 12 'in an anti-torque manner with the housing 9', 5, the guiding element 12, 12 ' The transfer element 11 is rotatably mounted,
And a gap (13) arranged between the transfer element (11) and the guiding element (12, 12 ') surrounding the rotating shaft (10), the gap being connected to the storage volume (1) (4) allows the transfer element (4) to enter the gap (13) for guiding the transfer element (11) from the storage volume part (1) to the outside, the gap (13, 13 ' (18, 18 ', 19, 19'),
The bearing surface 18,18'associated with the conveying element 11 is movable relative to the bearing surface 19,19'of the guide element 12,12 '
Device for transferring powder. The method according to claim 6,
Characterized in that the conveying element (11) is a flat ring-shaped disc, the guide element (12, 12 ') being a hub supporting the disc and /
Device for transferring powder. The method according to claim 6,
Characterized in that the conveying element (11) is a screw and the guide element (12, 12 ') is a bearing for supporting the cylindrical section (17)
Device for transferring powder. 9. The method of claim 8,
Characterized in that the transfer element (11) comprises receiving means (3, 15) for temporarily receiving the powder (4)
Characterized in that the gap (13) and the receiving means (3) between the bearing surfaces (18, 18 ', 19, 19') defining the gap (13) are at least partially open felled,
Device for transferring powder. The method according to claim 6,
The receiving means 3 are in particular the delivery chambers arranged in the form of a circular ring about the axis of rotation 10 and / or the receiving means 3 are arranged in the middle space between the screw flights 14, (15)
Device for transferring powder. 9. The method of claim 8,
The transfer element 11 is actuated against the bearing surface 9 by a force by a contact pressing device 6 and the first wider side surface of the disc- Wherein a second wide side surface which is actuated by the contact pressure device (6) and rests on the opposite side of the first wide side surface lies flat on the bearing surface (9)
Device for transferring powder.

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