Patent Application
20190255795
The present invention relates to a pressure granulation machine for molded products. Specifically, it relates to a pressure granulation machine by which molded products can be taken out from the machine without using a mechanism for extruding the products.
Conventionally, a briquetting machine has been known as a pressure granulation machine by using rolls that granulate powdery material by compressing it. By the briquetting machine, powdery material is fed from above to a gap between a pair of pressing rolls that consist of a fixed rotating roll, and a movable rotating roll that is pressed by an oil cylinder. The briquetting machine granulates the powdery material by compressing it by means of the pair of pressing rolls to produce briquettes, i.e., granular products.
The products that are granulated by a briquetting machine are connected to a sheet, i.e., to form burrs. Thus removing the burrs from the products must be carried out. Especially, if the products are small, such as 3 mm or less, removing the burrs becomes difficult such that well-shaped products cannot be obtained. This is a problem.
To solve the problem, in a process for granulating powdery material to produce tablets by pressing it by means of a pressure granulation machine by using a pair of rolls, which inwardly rotate, a plurality of concavities for granulating tablets are formed on the outer surface of one of the pair of rollers. The roll on which the concavities are formed is rotated so that the speed at the surface is slower than that of the roll on which no concavity is formed. As a result, a shear force is applied to the outer edges of the tablets so that burrs are prevented from being generated. Such a process has been proposed (see Patent Literature 1).
However, if a mechanism for extruding the products is used for taking out the products from the concavities, the powdery material that has adhered to interstices of the members of the mechanism often interrupts the operation of it. Further, the number of members increases, to thereby increase the cost of the machine. Further, the lack of cleanliness gets worse. These are problems.
The present invention aims to provide a pressure granulation machine that is not equipped with a mechanism for extruding products, that has a simple structure to reclaim products, and that has a high degree of cleanliness.
Japanese Patent Gazette No. 4380784
To achieve the above-mentioned objectives, as in
By this configuration, since the second pressing roll rotates faster than the first pressing roll does, any material that does not fill the concavities for molding, i.e., to form burrs, adheres to the outer surface of the second pressing roll. Thus products without burrs are manufactured in the concavities for molding of the first pressing roll by granulating the material by compressing it. Since the products that have been molded in the concavities for molding of the first pressing roll by granulating the material by compressing it are suctioned by the first suctioning device to be ripped off the concavities for molding, no mechanism for extruding the products is needed. Thus the pressure granulation machine that can reclaim the products by a simple structure, that has no interstices where powdery material adheres, and that has a high degree of cleanliness, can be provided.
By the pressure granulation machine for molded products of a second aspect of the present invention, as in
By the pressure granulation machine for molded products of a third aspect of the present invention, as in
By the pressure granulation machine for molded products of a fourth aspect of the present invention, as in
By the pressure granulation machine for molded products of a fifth aspect of the present invention, as in
By the pressure granulation machine for molded products of a sixth aspect of the present invention, as in
By the pressure granulation machine for molded products of a seventh aspect of the present invention, as in
By the pressure granulation machine for molded products of an eighth aspect of the present invention, as in
By the pressure granulation machine for molded products of a ninth aspect of the present invention, as in
By the pressure granulation machine for molded products of a tenth aspect of the present invention, as in
By the pressure granulation machine for molded products of an eleventh aspect of the present invention, as in
By the pressure granulation machine for molded products of a twelfth aspect of the present invention, as in
By the pressure granulation machine for molded products of a thirteenth aspect of the present invention, as in
By the pressure granulation machine for molded products of a fourteenth aspect of the present invention, as in
By the pressure granulation machine for molded products of a fifteenth aspect of the present invention, as in
By the pressure granulation machine for molded products of a sixteenth aspect of the present invention, as in
By the pressure granulation machine for molded products of the present invention, since the second pressing roll rotates at a faster speed at the outer surface than the first pressing roll does, the material that does not fill the concavities for molding, i.e., the burrs, adheres to the outer surface of the second pressing roll. Thus, products that have no burrs are formed in the concavities for molding of the first pressing roll by granulating the powdery material by compressing it. Further, since the molded products in the concavities for molding of the first pressing roll are suctioned by means of the first suctioning device to be ripped off the concavities for molding, no mechanism for extruding the products is needed. Thus, a pressure granulation machine that can reclaim products by a simple structure, that has no interstices where powdery material adheres, and that has a high degree of cleanliness, can be provided.
The basic Japanese patent application, No. 2016-114181, filed Jun. 8, 2016, is hereby incorporated by reference in its entirety in the present application.
The present invention will become more fully understood from the detailed description given below. However, that description and the specific embodiments are only illustrations of the desired embodiments of the present invention, and so are given only for an explanation. Various possible changes and modifications will be apparent to those of ordinary skill in the art on the basis of the detailed description.
The applicant has no intention to dedicate to the public any disclosed embodiment. Among the disclosed changes and modifications, those which may not literally fall within the scope of the present claims constitute, therefore, under the doctrine of equivalents, a part of the present invention.
The use of the articles “a,” “an,” and “the” and similar referents in the specification and claims are to be construed to cover both the singular and the plural form of a noun, unless otherwise indicated herein or clearly contradicted by the context. The use of any and all examples, or exemplary language (e.g., “such as”) provided herein is intended merely to better illuminate the invention, and so does not limit the scope of the invention, unless otherwise stated.
Below, a pressure granulation machine for molded products as an embodiment of the present invention is discussed with reference to drawings. In the drawings, the same numeral or symbol is used for the elements that correspond to, or are similar to, each other. Thus duplicate descriptions are omitted.
As in
As in
A scraper 80 is provided so as to contact the lower part of the second pressing roll 20. The lower part of the second pressing roll 20 may be downstream of the position for pressing the material 110 with the first pressing roll 10. It is preferable that it not be beyond the lowest position. Here, the wording “so as to contact” means that the scraper 80 is so close to the lower part of the second pressing roll 20 that it can scrape off the sheet-like material 130 that adheres to the outer surface 26 of the second pressing roll 20. The scraper 80 is a member that is long in the axial direction of the second pressing roll 20 (the direction that is perpendicular to the sheet of
A first suctioning roll 50, which is a first suctioning device, is provided so as to contact the lower part of the first pressing roll 10. The lower part of the first pressing roll 10 is downstream of the position where the material 110 is granulated by compression with the second pressing roll 20. The material 110 has been fed from the screw feeder 100 and has filled the concavities 12 for molding of the first pressing roll 10. Here, the wording “so as to contact” means that the first suctioning roll 50 is so close to the first pressing roll 10 so as to be able to suction the molded products 120 in the concavities 12 for molding by suctioning through the apertures 59 for suctioning of the first suctioning roll. That wording may be replaced so as to say that the first suctioning roll 50 contacts the first pressing roll 10.
The first suctioning roll 50 is enlarged in
The space 58 in the outer ring 52 of the first suctioning roll 50 is caused to have a negative pressure so as to suction through the apertures 59 for suctioning on the outer surface 51. The first suctioning roll 50 is connected to the switching device 42. The vacuum generator 40 is connected to the switching device 42 through vacuum piping 44. The switching device 42 connects the vacuum piping 44 to the spaces 58 that are divided into three spaces through a branch pipe. Shut-off valves are provided to vacuum tubes (not shown) that are located downstream of the branch pipe. The space 58 at the section A, which is close to the first pressing roll 10, is caused to have a negative pressure. Alternatively, a flow path that is connected to the vacuum piping 44 and to the space 58 only at the section A, which is close to the first pressing roll 10, may be provided. Or, any other known configuration may be used to cause the space 58, only at the section A, to have a negative pressure. The switching device 42 may cause the space 58 at the section A, which is close to the first pressing roll 10, and the space 58 at the section C, which is upstream of the section A (the space 58 that comes to the position that is close to the first pressing roll 10 at the next turn as the first suctioning roll 50 rotates), to have a negative pressure. The space 58 at the section B, which leaves the section A by the rotation of the first suctioning roll 50, is released from the negative pressure so as to stop suctioning through the apertures 59 for suctioning.
One of the three spaces 58, 58, 58, namely, the one that is at the section C and will come to the section A at the next turn in the rotation of the first suctioning roll 50, which section A is close to the first pressing roll 10, may be pressurized. At the space 58 to be pressurized, a device (not shown) that is like the switching device 42, and a device for pressurizing (not shown), such as a compressor, may be connected by a pressure piping (not shown). The method for pressurizing the space 58 is not limited to the above. The outer surface 51 (the parts of the outer surface 51 that correspond to the concavities 12 for molding) of the first suctioning roll 50 that rotates moves from the section A to the section C via the section B. Then it moves again to the section A. That is, the parts of the outer surface 51 that correspond to the concavities 12 for molding rip off the molded products from the concavities 12 for molding at the section A. When they come to the section B, they release the molded products. Thereafter, when they come to the section C, any fine powder that has plugged the apertures 59 for suctioning is discharged. Incidentally, the number of the inner spaces 58 of the first suctioning roll 50 may be 2, 3, or 4, or more.
Next, the operation of the pressure granulation machine 1 is discussed. The screw feeder 100 stores the material 110 for the molded products 120. The material 110 is not limited, and may be powder material for tablets, food powder for granular cakes, or metallic or plastic powder material. By the rotation of the screw 102 of the screw feeder 100 the material 110 is fed to the gap between the first pressing roll 10 and the second pressing roll 20.
The material 110 is pressed by the first pressing roll 10 and the second pressing roll 20 to fill the concavities 12 for molding on the outer surface 16 of the first pressing roll 10. When the first pressing roll 10 and the second pressing roll 20 inwardly rotate, the material 110 that has filled the concavities 12 for molding is pressed by means of the second pressing roll 20, to be granulated by compression, to thereby become the molded products 120. At the same time, the material 110 that has not been used to fill the concavities 12 for molding is pressed by means of the outer surface 16 of the first pressing roll 10 (the parts other than the concavities 12 for molding) and by means of the outer surface 26 of the second pressing roll 20, to thereby become a thin sheet 130. Since the second pressing roll 20 rotates at a speed at the outer surface that is faster than that of the first pressing roll 10, a shear force is generated between the molded products 120 in the concavities 12 for molding and the sheet-like material 130. Thus the sheet-like material 130 is separated from the molded products 120. That is, no burrs attach to the molded products 120. The sheet-like material 130 adheres to the second pressing roll 20 that rotates at a higher speed at the outer surface.
As the first pressing roll 10 rotates, the molded products 120 in the concavities 12 for molding move to a position that is close to the first suctioning roll 50. In the first suctioning roll 50 air is suctioned through the apertures 59 for suctioning. Thus, as in
The molded products 120 that adhere to the outer surface 51 of the first suctioning roll 50 rotate together with the first suctioning roll 50. When the first suctioning roll 50 rotates, the space 58 where the apertures 59 for suctioning suction the molded products 120 moves to leave the section A, which is close to the first pressing roll 10, and moves to the section B. Then that space 58 is no longer at a negative pressure, so that the apertures 59 for suctioning stop suctioning. When the apertures 59 for suctioning stop suctioning, the molded products 120 no longer adhere to the outer surface 51 of the first suctioning roll 50, and freely drop. Thus, the molded products 120 can be reclaimed at a predetermined position.
When the first suctioning roll 50 further rotates, so that that space 58 moves to the section C, the space 58, where the apertures 59 for suctioning have suctioned the molded products 120, may be pressurized. If the space 58 is pressurized, compressed air is ejected through the apertures 59 for suctioning. Thus fine powder, such as any powder or dust that has been generated from the material 110, that has plugged the apertures 59 for suctioning, is discharged. Cleaning the apertures 59 for suctioning is no longer required.
When the second pressing roll 20 rotates, the sheet-like material 130 that adheres to the outer surface 26 of the second pressing roll 20 rotates, to be scraped from the second pressing roll 20 by means of the scraper 80. Thus, the material 130 that has not been used for the molded products 120 can be reclaimed at a predetermined position. The reclaimed material 130 may again be sent to the screw feeder 100.
As discussed above, by the pressure granulation machine 1, since the second pressing roll 20 rotates at a speed at the outer surface that is faster than that of the first pressing roll 10, the material 130 that has not filled the concavities 12 for molding, i.e., to form burrs, adheres to the outer surface 26 of the second pressing roll 20. The molded products 120, to which no burrs attach, can be manufactured in the concavities 12 for molding of the first pressing roll 10 by granulating by compression. The molded products 120, which have been manufactured in the concavities 12 for molding of the first pressing roll 10 by granulating by compression, are suctioned by the first suctioning roll 50 to be ripped off the concavities 12 for molding. Thus, since no mechanism for extruding the products is needed, the molded products 120 can be reclaimed by a simple structure, no powdery material adheres to the interstices, and there is a high degree of cleanliness. Further, if air is ejected through the apertures 59 for suctioning in the first suctioning roll 50 at the section C, any fine powder that has plugged the apertures 59 for suctioning can be discharged, so that the first suctioning roll 50 has a high degree of cleanliness.
Next, with reference to
The first port 70 for suctioning is a nozzle that has, for example, a rectangular cross-section. It is located so that its opening faces the outer surface 16 of the first pressing roll 10. It is also located so close to the first pressing roll 10 that the molded products 120 in the concavities 12 for molding of the first pressing roll 10 can be suctioned by suctioning through the first port 70 for suctioning. It is connected to a vacuum generator (not shown), such as a vacuum tank, through a suction piping 72. On the suction piping 72 a cyclone-type reclaiming device 74 is provided. The cyclone-type reclaiming device 74 separates the molded products 120, which are suctioned, from the air and from the fine powder, to reclaim the molded products 120. Since the configuration of the cyclone-type reclaiming device 74 is publicly known, its detailed description is omitted.
By the pressure granulation machine 2, like by the pressure granulation machine 1, since the second pressing roll 20 rotates at a speed at the outer surface that is faster than that of the first pressing roll 10, the material 130 that has not fill the concavities 12 for molding, i.e., to form burrs, adheres to the outer surface 26 of the second pressing roll 20. The molded products 120, to which no burrs attach, can be manufactured in the concavities 12 for molding of the first pressing roll 10 by granulating by compression. The molded products 120, which have been manufactured in the concavities 12 for molding of the first pressing roll 10 by granulating by compression, are suctioned by the first port 70 for suctioning to be ripped off the concavities 12 for molding. Since no mechanism for extruding the products is needed, the molded products 120 can be reclaimed by a simple structure, no powdery material adheres to the interstices, and there is a high degree of cleanliness. Further, the molded products 120 can be separated from the fine powder by means of the cyclone-type reclaiming device 74 to be reclaimed. Since there is no moving part in either the first port 70 for suctioning or the cyclone-type reclaiming device 74, maintenance is facilitated and there is a high degree of cleanliness.
Next, with reference to
The second pressing roll 30 is cylindrical. It rotates about a horizontal rotary shaft 34. The concavities 32 for molding are formed on the outer surface 36 of it. The concavities 32 for molding are the same as the concavities 12 for molding that are formed on the outer surface 16 of the first pressing roll 10. Incidentally, the size, number, and arrangement of the concavities 32 for molding may be different from those of the concavities 12 for molding. The second pressing roll 30 is made of metal, plastic, rubber, or ceramic, based on the material 122 that is to be granulated by compression. It may be made of the same material as the first pressing roll 10, or different material.
The secondary roll 90 is cylindrical. It inwardly rotates about an axis that is parallel to the second pressing roll 30. It rotates at a speed at the outer surface that is faster than that of the outer surface 36 of the second pressing roll 30. The outer surface of it is flat. It is located so as to contact the outer surface 36 of the second pressing roll 30. Here, the wording “so as to contact” means that the secondary roll 90 contacts or presses the sheet-like material 132 that adheres to the outer surface 36 of the second pressing roll 30. That wording may be replaced by “contact.” A scraper 92 is provided so as to contact the outer surface of the secondary roll 90 downstream of the position where the secondary roll 90 contacts the second pressing roll 30. Here, “downstream of the position where the secondary roll 90 contacts the second pressing roll 30” may be any position downstream of the position where the secondary roll 90 contacts the second pressing roll 30, but preferably not beyond the lowest point. The scraper 92 is a member that is long in the axial direction of the secondary roll 90 and has a sharp edge or a round edge. It is located so as to scrape off the material 132 that adheres to the outer surface 91 of the secondary roll 90.
The configuration of the second suctioning roll 150 is generally the same as that of the first suctioning roll 50. It may be connected to the vacuum generator 40 (see
In the second pressing roll 30 of the pressure granulation machine 3, the material 110 fills the concavities 32 for molding and the sheet-like material 132 adheres to the outer surface 36 of the second pressing roll 30. The material 110 that has filled the concavities 32 for molding is pressed by the first pressing roll 10 and is granulated by compression to become the molded products 122. Incidentally, like in the pressure granulation machine 1, the material 110 that has filled the concavities 12 for molding of the first pressing roll 10 is pressed by the second pressing roll 30 to become the molded products 120. The material 132 that adheres to the outer surface 36 contacts the secondary roll 90. Since the secondary roll 90 rotates at a speed at the outer surface that is faster than that of the second pressing roll 30, a shear force is generated between the sheet-like material 132 and the molded products 122 in the concavities 32 for molding of the second pressing roll 30. Thus, the sheet-like material 132 is separated from the molded products 122, which have been granulated by compression in the concavities 32 for molding. That is, no burrs are attached to the molded products 122. The sheet-like material 132 adheres to the outer surface 91 of the secondary roll 90 that rotates at a faster speed at the outer surface. The material 132 that adheres to the secondary roll 90 is scraped off the outer surface 91 by means of the scraper 92, and is reclaimed. The reclaimed material 132 may be sent back to the screw feeder 100. Incidentally, the sheet-like material 132 adheres to the outer surface 36 of the second pressing roll 30 by pressure that is caused by having the first pressing roll 10 contact the second pressing roll 30. Thus, if the pressure that is applied to the second pressing roll 30 by the secondary roll 90 is too low, the sheet-like material 132 may not adhere to the secondary roll 90. Therefore, the pressure that is applied to the material 132 on the second pressing roll 30 by the secondary roll 90 is preferably equal to, or slightly greater than, the pressure that is generated between the first pressing roll 10 and the second pressing roll 30. However, if too high a pressure were to be applied to the material 132, the density of the material 132 would unfavorably change, to cause differences in its properties.
Like the molded products 120, which have been granulated by compression in the concavities 12 for molding of the first pressing roll 10, the molded products 122, which have been granulated by compression in the concavities 32 for molding of the second pressing roll 30, are suctioned by the second suctioning roll 150, to be reclaimed. That is, the apertures 159 for suctioning open on the outer surface 151 so that the molded products 122 in the concavities 32 for molding are suctioned at the position where the second suctioning roll 150 contacts the second pressing roll 30. When the second suctioning roll 150 rotates to stop suctioning through the apertures 159 for suctioning, the molded products 122 are released, to be reclaimed at a predetermined position. Incidentally, the second suctioning roll 150a preferably has a section where air is ejected through the apertures for suctioning.
By the pressure granulation machine 3, like by the pressure granulation machine 1, the molded products 120, which have been granulated by compression in the concavities 12 for molding of the first pressing roll 10, are suctioned by the first suctioning roll 50 to be ripped off the concavities 12 for molding. Thus, since no mechanism for extruding the products is needed, the molded products 120 can be reclaimed by a simple structure, no powdery material adheres to the interstices, and there is a high degree of cleanliness. Further, if air is ejected through the apertures 59 for suctioning in the first suctioning roll 50 at the section C, any fine powder that has plugged the apertures 59 for suctioning is discharged. Thus, the first suctioning roll 50 has a high degree of cleanliness. Since the second pressing roll 30 rotates at a speed at the outer surface that is faster than that of the first pressing roll 10, the material 132 that has filled the concavities 12 for molding adheres to the outer surface 36 of the second pressing roll 30. It adheres to the outer surface 91 of the secondary roll 90 that rotates at a speed at the outer surface that is faster than that of the second pressing roll 30. Thus, no burrs are attached to the molded products 122, which have been granulated by compression in the concavities 32 for molding of the second pressing roll 30. The molded products 122 are suctioned by the second suctioning roll 150 to be ripped off the concavities 32 for molding. Thus, since no mechanism for extruding the products is needed, the molded products 122 can be reclaimed by a simple structure, no powdery material adheres to the interstices, and there is a high degree of cleanliness. Further, since the concavities 12, 32 for molding are formed on both the outer surface 16 of the first pressing roll 10 and the outer surface 36 of the second pressing roll 30, the molded products 120, 122 are efficiently granulated by compression.
Next, with reference to
The second pressing roll 30 is the same as that of the pressure granulation machine 3 (see
The configuration of the second port 71 for suctioning is generally the same as that of the first port 70 for suctioning. The first port 70 for suctioning and the second port 71 for suctioning are connected to the cyclone-type reclaiming device 74 through a suction piping 76 and a suction piping 78, respectively. The suction piping 76 and the suction piping 78 are preferably combined to form a single piping at a branch pipe that is located upstream (the side near the first and second ports 70, 71 for suctioning) of the cyclone-type reclaiming device 74. The cyclone-type reclaiming device 74 is connected to a vacuum generator (not shown), such as a vacuum tank.
By the pressure granulation machine 4, the molded products 122, which have been granulated by compression in the concavities 32 for molding of the second pressing roll 30, are suctioned by the second port 71 for suctioning. The molded products 122 that have been suctioned by the second port 71 for suctioning are, together with the molded products 120 that have been suctioned by the first port 70 for suctioning, separated from the air and from the fine powder, which have been suctioned, by means of the cyclone-type reclaiming device 74, to be reclaimed. Incidentally, a cyclone-type reclaiming device that is connected to the second port 71 for suctioning may be provided in addition to the cyclone-type reclaiming device 74 that is connected to the first port 70 for suctioning. Further, respective vacuum generators may be provided to the first and second ports 70, 71 for suctioning.
By the pressure granulation machine 4, like by the pressure granulation machine 2, since the second pressing roll 20 rotates at a speed at the outer surface that is faster than that of the first pressing roll 10, the material 132 that has not filled the concavities 12 for molding, i.e., to form the burrs, adheres to the outer surface 26 of the second pressing roll 20. Thus, the molded products 120, to which no burrs attach, are granulated by compression in the concavities 12 for molding of the first pressing roll 10. The molded products 120, which have been granulated by compression in the concavities 12 for molding of the first pressing roll 10, are suctioned by the first port 70 for suctioning to be ripped off the concavities 12 for molding. Thus, since no mechanism for extruding the products is needed, the molded products 120 can be reclaimed by a simple structure, no powdery material adheres to the interstices, and there is a high degree of cleanliness. The molded products 120 can be reclaimed after being separated from the fine powder, which has been suctioned, by means of the cyclone-type reclaiming device 74. Both the first port 70 for suctioning and the cyclone-type reclaiming device 74 have no moving part, so as to facilitate maintenance and to provide a high degree of cleanliness. Since the second pressing roll 30 rotates at a speed at the outer surface that is faster than that of the first pressing roll 10, the material 132 that has not filled the concavities 12 for molding adheres to the outer surface 36 of the second pressing roll 30. It adheres to the outer surface 91 of the secondary roll 90 that rotates at a speed at the outer surface that is faster than that of the second pressing roll 30. Thus no burrs attach to the molded products 122, which have been granulated by compression in the concavities 32 for molding of the second pressing roll 30. The molded products 122, which have been granulated by compression in the concavities 32 for molding of the second pressing roll 30, are suctioned by the second port 71 for suctioning, to be ripped off the concavities 32 for molding. Thus, since no mechanism for extruding the products is needed, the molded products 122 can be reclaimed by a simple structure, no powdery material adheres to the interstices, and there is a high degree of cleanliness. Further, since the concavities 12, 32 for molding are formed on both the outer surface 16 of the first pressing roll 10 and the outer surface 36 of the second pressing roll 30, the molded products 120, 122 are efficiently granulated by compression.
Next, with reference to
The inner ring 63 and the support shaft 66 of the first suctioning roll 60 are fixed, and so do not rotate. The outer ring 62 rotates to slide on the inner ring 63. A vacuum generator is connected to one of the two spaces 68, 68 in the inner ring 63, which space 68 is connected to the holes 65 for connection that are connected to the apertures 69 for suctioning that suction the molded products 120. In the first suctioning roll 60, since no spaces 68 rotate, the switching device 42 that is connected to the first suctioning roll 50 (see
The space 68 in the inner ring 63 of the first suctioning roll 60 is caused to have a negative pressure so as to suction air through the apertures 69 for suctioning of the outer surface 61. Namely, the space 68 at the negative pressure is connected to the apertures 69 for suctioning through the holes 65 for connection. Incidentally, the space in the inner ring 63 may be divided into three or more spaces 68 so that the space 68 downstream of the position where the molded products 120 are released from the outer ring 62 is pressurized to eject air through the apertures 69 for suctioning via the holes 65 for connection. If air is ejected through the apertures 69 for suctioning, any powder, any fine powder, etc., of the material 110 that has plugged the apertures 69 for suctioning, can be discharged. Thus, no cleaning of the apertures 69 for suctioning is required.
By the pressure granulation machine 5, since the second pressing roll 20 rotates at a speed at the outer surface that is faster than that of the first pressing roll 10, the material 130 that has not filled the concavities 12 for molding, i.e., to form the burrs, adheres to the outer surface 26 of the second pressing roll 20. Thus, the molded products 120, to which no burrs attach, are granulated by compression in the concavities 12 for molding of the first pressing roll 10. The molded products 120, which have been granulated by compression in the concavities 12 for molding of the first pressing roll 10, are suctioned by the first suctioning roll 60 to be ripped off the concavities 12 for molding. Thus, since no mechanism for extruding the products is needed, the molded products 120 can be reclaimed by a simple structure, no powdery material adheres to the interstices, and there is a high degree of cleanliness. Further, since in the first suctioning roll 50 only the outer ring 62 rotates, connection to the vacuum generator 40 (see
Next, with reference to
In the pressure granulation machine 6, since the diameter D2 of the second pressing roll 21 is larger than the diameter D1 of the first pressing roll 10, the first pressing roll 10 and the second pressing roll 21 may rotate at the same speed so that the second pressing roll 20 rotates at a speed at the outer surface that is faster than that of the first pressing roll 10. Thus, the burrs 130, which are the material that has not filled the concavities 12 for molding, adhere to the outer surface of the second pressing roll 21. Thus, the molded products 120, to which no burrs attach, are granulated by compression in the concavities 12 for molding of the first pressing roll 10. By the pressure granulation machine 6 the driving system, which is complicated and costly, can be favorably simplified. Especially, when any existing machine is upgraded to be replaced by the machine of the present invention, no modification to the driving system is required. This is a great advantage. Incidentally, even in the pressure granulation machine 6 the speed of rotation of the first pressing roll 10 may differ from that of the second pressing roll 21.
In the pressure granulation machines 1-6 each feature of them may be combined with another feature. For example, in the pressure granulation machine 2 as shown in
As discussed above, by the pressure granulation machine of the present invention no mechanism for extruding the products is needed. Thus, even if the number of concavities for molding increases, the parts will not increase. Thus the number of concavities for molding can be easily increased. When small molded products, such as ones 3 mm in diameter or less, are manufactured, this advantage is prominent.
Below, the main reference numerals and symbols that are used in the detailed description and drawing are listed.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2016-114181 | Jun 2016 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2017/020567 | 6/2/2017 | WO | 00 |
