Collection member for collecting magnetic foreign matter, manufacturing method for granular material, collection device, and magnet member

Abstract

Provided is a collection member for collecting magnetic foreign matter from a granular material, the collection member comprising: a conveyance path for conveying the granular material; a magnet member disposed on the back surface side of the conveyance surface of the conveyance path; and a magnetic linear structure disposed between the conveyance path and the magnet member. Also provided is a magnet member having a ferromagnetic linear structure on a surface thereof.

Description

Collection member for collecting magnetic foreign matter, method for producing powder and granular material, collection device, and magnet member

[0001] The present disclosure relates to a collection member for collecting magnetic foreign matter, a method for producing powder and granular material, a collection device, and a magnet member.

[0002] Various foreign matters may be mixed into powder and granular material, and several methods for removing magnetic foreign matters such as metal pieces from powder and granular material are known. For example, there is a method in which a magnetic mesh is disposed in a conveyance path for powder and granular material, and magnetic foreign matter is collected and removed while the powder and granular material pass through the magnetic mesh. However, pressure loss occurs while the powder and granular material pass through the magnetic mesh. If the openings of the magnetic mesh are enlarged to prevent an increase in pressure loss, the attraction force by magnetic force decreases.

[0003] The method for removing magnetic foreign matter from powder and granular material is also applied to a method for removing magnetic foreign matter from resin pellets. Patent Document 1 discloses a method for sorting magnetic-containing resin pellets and non-magnetic-containing resin pellets using a belt-type magnet roll separator, wherein the method specifies the shape of the pellets and the speed of the belt.

[0004] Japanese Unexamined Patent Application Publication No. 2018-130838

[0005] In the above-described method of passing powder and granular material through a magnetic mesh, when large powder and granular material such as resin pellets are used, pressure loss is likely to occur, and when the opening diameter is increased in accordance with the size of the resin pellets, the attraction force by magnetic force decreases. Furthermore, in this method, wires and the like constituting the magnetic mesh may be cut by the passage of the powder and granular material.

[0006] In the technique disclosed in Patent Document 1, the magnetic force of the belt-type magnet roll separator is weak, and the attraction force for magnetic-containing resin pellets is insufficient. Furthermore, the technique disclosed in Patent Document 1 uses resin pellets having an elliptical cross-section with a specified ratio of major axis to minor axis, and requires controlling the speed of the belt that conveys the resin pellets, thus lacking versatility.

[0007] In view of these circumstances, various embodiments of this disclosure aim to provide a collection member, a collection method, a collection apparatus, and a magnetic member capable of efficiently collecting magnetic foreign matter from powders and granules.

[0008] Some embodiments of the present disclosure are illustrated below. [1] A collecting member for collecting magnetic foreign matter from granular material, comprising a transport path for transporting the granular material, a magnetic member disposed on the back side of the transport surface of the transport path, and a magnetic linear structure between the transport path and the magnetic member. [2] The collecting member according to [1], wherein the magnetic linear structure has a plurality of linear shapes spaced apart from each other. [3] The collecting member according to [1] or [2], wherein the magnetic linear structure has a mesh shape formed by the intersection of a plurality of linear shapes. [4] The collecting member according to any one of [1] to [3], wherein the granular material comprises at least one selected from the group consisting of granules, powder, crushed material, and fibrous material. [5] The collecting member according to any one of [1] to [4], wherein the magnetic foreign matter is contained in the granular material separately from the main material of the granular material, or is contained within or attached to the main material of the granular material. [6] The collecting member according to any one of [1] to [5], wherein the average particle size of the magnetic foreign matter is 80 μm or more. [7] The collecting member according to any one of [1] to [6], comprising a container for housing the magnetic member, wherein the magnetic linear structure is provided on the surface of the container. [8] The collecting member according to any one of [1] to [7], wherein the transport path is an inclined surface. [9] The collecting member according to any one of [1] to [6], comprising a roller and a belt disposed on the outer circumferential surface of the roller, wherein the magnetic member is provided on the roller and the magnetic linear structure is provided on the belt.

[10] The collecting member according to any one of [1] to [6], comprising a roller, wherein the magnetic member is provided inside the roller and the magnetic linear structure is provided on the outer circumferential surface of the roller.

[11] The collecting member according to

[10] , wherein the magnetic linear structure is formed on the surface of the roller.

[12] The collecting member according to

[10] , wherein the magnetic linear structure is a magnetic sheet and is disposed on the outer circumferential surface of the roller.

[13] The collecting member according to any one of

[10] to

[12] , wherein the powder or granular material is supplied to the roller by gravity from above the roller.

[14] The collecting member according to any one of [1] to

[13] , wherein the magnetic member is a magnetic member having a ferromagnetic linear structure on its surface.

[15] A magnetic member having a ferromagnetic linear structure on its surface.

[16] The magnetic member according to

[15] , comprising a magnetic part and a covering part, wherein the covering part has the ferromagnetic linear structure.

[17] The magnetic member according to

[15] , comprising a magnetic part and a covering part, wherein the covering part is a linear ferromagnetic material and is disposed on the surface of the magnetic part.

[18] The magnetic member according to

[15] , comprising a magnetic part and a covering part, wherein the covering part is a magnetic material member having a surface having the ferromagnetic linear structure and is disposed on the surface of the magnetic part.

[19] The magnetic member according to any one of

[15] to

[18] , wherein the ferromagnetic linear structure is a plurality of linear shapes spaced apart from each other.

[20] The magnetic member according to any one of

[15] to

[18] , wherein the ferromagnetic linear structure is a mesh shape formed by the intersection of a plurality of linear shapes.

[21] A method for producing a powder or granular material from which magnetic foreign matter has been removed, comprising transporting the powder or granular material to the transport path of the collection member using a collection member comprising a transport path for transporting the powder or granular material, a magnetic member disposed on the back side with respect to the transport surface of the transport path, and a magnetic linear structure between the transport path and the magnetic member, wherein the magnetic foreign matter is collected from the powder or granular material by the action of the magnetic force of the magnetic member causing the magnetic foreign matter to be attracted to the transport path.

[22] A collection device for removing magnetic foreign matter from a powder or granular material, comprising a supply unit for supplying the powder or granular material, a transport unit for transporting the powder or granular material supplied from the supply unit, and a collection unit for collecting the magnetic foreign matter collected in the transport unit, wherein the transport unit comprises a transport path for transporting the powder or granular material, a magnetic member disposed on the back side with respect to the transport surface of the transport path, and a magnetic linear structure between the transport path and the magnetic member.

[0009] According to this disclosure, it is possible to provide a collection member capable of efficiently collecting magnetic foreign matter from powders and granules, a collection method thereof, and a collection apparatus thereof. Furthermore, it is possible to provide a magnetic member that has a high magnetic flux density while not having a large difference in magnetic flux density throughout.

[0010] Figure 1 is a schematic diagram showing an example of a collection member according to the first embodiment. Figure 2A is a top end view schematic of the magnetic linear structure 5 shown in Figure 1. Figure 2B is a side cross-sectional view schematic of the magnetic linear structure 5 shown in Figure 1. Figure 3 is a schematic diagram showing an example of a collection member according to the second embodiment. Figure 4A shows a schematic cross-sectional view of an example of the belt 30 shown in Figure 3. Figure 4B shows a schematic cross-sectional view of an example of the belt 30 shown in Figure 3. Figure 4C shows a schematic cross-sectional view of an example of the belt 30 shown in Figure 3. Figure 4D shows a schematic cross-sectional view of an example of the belt 30 shown in Figure 3. Figure 4E shows a schematic cross-sectional view of an example of the belt 30 shown in Figure 3. Figure 4F shows a schematic cross-sectional view of an example of the belt 30 shown in Figure 3. Figure 4G shows a schematic cross-sectional view of an example of the belt 30 shown in Figure 3. Figure 4H shows a schematic cross-sectional view of an example of the belt 30 shown in Figure 3. Figure 4I shows a schematic cross-sectional view of an example of the belt 30 shown in Figure 3. Figure 4J shows a schematic cross-sectional view of an example of the belt 30 shown in Figure 3. Figure 5 is a schematic diagram showing an example of a collection member of the third embodiment. Figure 6A is a cross-sectional view of one embodiment of the magnet member of the second embodiment. Figure 6B is a cross-sectional view of one embodiment of the magnet member of the second embodiment. Figure 6C is a cross-sectional view of one embodiment of the magnet member of the second embodiment. Figure 6D is a cross-sectional view of one embodiment of the magnet member of the second embodiment. Figure 6E is a cross-sectional view of one embodiment of the magnet member of the second embodiment.

[0011] The following describes some embodiments of this disclosure. The examples in the following description do not limit this disclosure.

[0012] [First Embodiment] According to the first embodiment, a collection member capable of efficiently collecting magnetic foreign matter from powders and granules is provided. Several embodiments of a collection member for collecting magnetic foreign matter from powders and granules will be described with reference to the drawings. The drawings may differ from the actual dimensional ratios in order to make the features of this disclosure easier to understand. Also, the materials and the like exemplified in the description of the drawings are examples only, and this disclosure is not limited to them.

[0013] <First Embodiment> The first embodiment will be described below with reference to the drawings. Figure 1 is a schematic diagram showing an example of a collection member of the first embodiment.

[0014] The collection member 1 comprises a transport path 4 for transporting powder granules 6, a magnetic member 2 positioned on the back side of the transport surface of the transport path 4, and a magnetic linear structure 5 between the transport path 4 and the magnetic member 2. The collection member 1 may further include a container 3 for holding the magnetic member 2.

[0015] Magnetic foreign matter can be collected from the powder granules 6 using the collection member 1. In the example shown in Figure 1, the powder granules 6 mainly consist of non-magnetic particles 6a and a small amount of magnetic particles 6b. The magnetic particles 6b are formed in particulate form by fine magnetic foreign matter being embedded in the main material. Depending on the application of the powder granules 6, the magnetic particles 6b may be treated as impurities, so it is preferable to collect and remove the magnetic particles 6b from the powder granules 6. Magnetic particles 6b may be mixed into the powder granules 6 during the manufacturing process, originating from the raw materials of the powder granules, the manufacturing equipment for producing the powder granules, the manufacturing equipment for producing articles using the powder granules, etc.

[0016] The granular material 6 may include at least one selected from the group consisting of granules, powders, crushed materials, and fibrous materials. In particular, it can be preferably applied to collect granules containing magnetic foreign matter. Examples of granules include pellets, granulated materials, tablets, etc. The dimensions of the granules are not particularly limited, but for example, in the case of pellets, the average diameter may be 1.0 to 5.0 mm and the average length may be 1.5 to 10.0 mm.

[0017] The main raw material for the powder / granule material 6 may be either non-magnetic inorganic or organic material, or a combination thereof. Examples of inorganic materials include ceramics, mineral grains, glass, metal particles, aggregated particles, crushed materials, and fibrous materials. Examples of organic materials include resins, and may be resin compounds. The resin may consist of a single material or a composite material of two or more resins. The resin compound may be a composite material of resin and inorganic material, and examples include glass fiber-containing resin compounds and carbon material-containing resin compounds. It is preferable that the powder / granule material 6 may contain magnetic particles 6b in addition to non-magnetic particles 6a, but magnetic particles with weaker magnetism than the magnetic particles 6b to be collected may be included as the main material.

[0018] If the powder material 6 contains a resin, the resin is preferably a thermoplastic resin. Examples of thermoplastic resins include crystalline thermoplastic resins such as polyacetal resin, polyarylene sulfide resin such as polyphenylene sulfide resin, polybutylene terephthalate resin, polyethylene terephthalate resin, and polyamide resin. These may be used individually or as a composite resin of two or more types. These resins may also be composite resins of these resins with other materials.

[0019] Magnetic foreign matter may be included in the powder or granular material separately from the main material. For example, it may be magnetic foreign matter such as metal fragments included separately from the non-magnetic particles 6a, which are the main material. In other examples, the magnetic foreign matter may be embedded in or attached to the main raw material of the powder or granular material. For example, this could include metal fragments coated with a non-magnetic material such as resin, metal fragments embedded inside pellets, or metal fragments attached to the surface of pellets. Among these, magnetic particles 6b, in which magnetic foreign matter is embedded in particles of approximately the same size as the non-magnetic particles 6a of the powder or granular material 6, are suitable for collection by the collection member 1 because they are difficult to collect from the main material by sorting based on size and specific gravity, etc.

[0020] The magnetic foreign matter can be any substance that becomes magnetized when placed in a magnetic field. For example, the magnetic foreign matter can be a substance that is magnetized via a magnetic linear structure 5 on the transport path 4 of the collection member 1. More specifically, the magnetic foreign matter can be a substance that, either on its own or embedded in or attached to the main material, is attracted to the transport surface of the transport path 4 of the collection member 1 by the magnetic force of the magnetic member 2. Specifically, the magnetic foreign matter can be a soft magnetic material such as iron, nickel, cobalt, or alloys thereof. The average particle size of the magnetic foreign matter may be 10 to 1,000 μm, 40 to 500 μm, or 80 to 200 μm. In the case of iron, the average particle size of the magnetic foreign matter is preferably 80 μm or more. By having the particle size of the magnetic foreign matter within the above range, the magnetic foreign matter can be collected more efficiently by the collection member 1. Here, the average particle size of the magnetic foreign matter is determined by observing a predetermined number of magnetic foreign matter using an optical microscope or the like, and taking the average value of the major axis of the magnetic foreign matter.

[0021] The magnetic linear structure 5 may be a structure comprising multiple linear shapes, such as linear shapes or mesh shapes. A first example of a linear shape is a structure having multiple linear shapes spaced apart from each other, preferably with the multiple linear shapes being parallel to each other, and preferably with approximately equal spacing between them. The width of one linear shape may be, for example, 0.1 to 1.0 mm. The narrower the width of the linear shapes and the spacing between them, within the above ranges, the more homogenized the magnetic field of the magnet 2a can be. The spacing between adjacent linear shapes may be, for example, 0.1 to 2.0 mm. The shape of the linear shapes may have a rectangular, trapezoidal, semicircular, or V-shaped cross-section in the short-side direction. From the viewpoint of homogenizing the magnetic field of the magnet member 2, it is preferable that the shape of the linear shapes be approximately the same in the longitudinal direction. Note that the dimensions and shape of the magnetic linear structure 5 shown in the figure are examples only and are not limited thereto.

[0022] A second example of a linear shape is one in which multiple linear shapes intersect to form a mesh shape. For example, a linear shape in a first direction and a linear shape in a second direction may intersect each other to form a mesh shape. The angle of intersection is not particularly limited but may be between 30 and 120°, or between 90° and 5°. The details of the linear shapes in each direction may be those described in the first example above. For example, the mesh shape may be a grid shape, and the width and spacing of the linear shapes in the first direction and the linear shapes in the second direction may be approximately the same, and they may be perpendicular to each other.

[0023] The magnetic linear structure 5 may penetrate in the thickness direction, and the magnetic member 2 may be exposed from the conveying surface, or it may have an uneven shape formed on the conveying surface side or its back side. The magnetic linear structure 5 may have a non-magnetic material filled in the penetrating portion or recess. This provides surface smoothness to the magnetic linear structure 5, further improving the conveying efficiency of the powder 6. It also has the effect of increasing the material strength of the magnetic linear structure 5. The non-magnetic material to be filled is preferably a resin material. In both cases, whether or not the magnetic linear structure 5 is filled with a non-magnetic material, a coating layer may be provided on the linear surface. The coating layer may be a surface smoothing agent such as silicone resin or fluororesin.

[0024] The magnetic linear structure 5 can be any magnetic material, such as a soft magnetic material like iron, nickel, cobalt, or an alloy thereof. However, it is preferable that the magnetic linear structure 5 be made of a material with a lower permeability than the magnetic force of the magnet 2a. This homogenizes the magnetic flux density on the transport surface of the transport path 4, thereby increasing the collection efficiency of magnetic particles 6b.

[0025] The magnetic linear structure 5 may be formed on the surface of the case 2b of the magnet member 2. In the example shown in Figure 1, the magnetic linear structure 5 is formed on the lid of the case 2b. A schematic top end view of this magnetic linear structure 5 is shown in Figure 2A, and a side cross-sectional view is shown in Figure 2B. In the example shown in this figure, the magnetic linear structure 5 has a grid shape formed by the intersection of a first linear shape formed in the longitudinal direction and a second linear shape formed in the short direction.

[0026] The conveying path 4 is formed by a conveying surface that conveys the powder granules 6. The surface of the conveying path 4 may be flat or curved. The conveying path 4 may also be pipe-shaped. The conveying path 4 may be an inclined surface, and the powder granules 6 can be conveyed by its own weight due to the inclination. The angle of the inclined surface may be adjusted according to the magnetic force of the magnetic member 2, the size and supply amount of the powder granules 6, etc., and may be, for example, 15 to 60° with respect to the horizontal plane.

[0027] In the example shown in Figure 1, the conveying path 4 is an inclined surface, and the conveying surface is flat. The upstream side of the conveying path 4 in the conveying direction X1 is raised, and a hopper 7 is provided above the upstream side in the conveying direction X1, from which the powdered material 6 is supplied. The angle of the inclined surface of the conveying path 4 may be adjusted according to the size of the powdered material 6, the amount supplied, etc. A recovery unit 8 is provided on the downstream side of the conveying path 4 in the conveying direction X1 to collect the powdered material 6 discharged from the conveying surface.

[0028] The magnetic member 2 comprises a magnet 2a and a case 2b that covers the entire surface of the magnet 2a, and is positioned on the back side with respect to the conveying surface of the conveying path 4. The magnetic member 2 should have enough magnetic force to generate a magnetic field on the conveying surface of the conveying path 4 and attract magnetic particles 6b to the conveying surface. The magnet 2a may be a permanent magnet, such as KS steel, MK steel, NKS steel, Alnico magnet, ferrite magnet, cobalt magnet, neodymium magnet, etc. The magnetic force of the magnetic member 2 should be adjusted by appropriately selecting its material so that it can attract magnetic particles 6b that may be contained in the powder granules 6 to the conveying surface. The magnet 2a may also be an electromagnet. If it is an electromagnet, the magnetic particles 6b attracted to the conveying surface can be recovered more easily by turning the magnetic field on and off. Also, if it is an electromagnet, it is possible to adjust the magnetic force according to the type of powder granules 6. The case 2b may be a magnetic material, such as a soft magnetic material such as iron, nickel, cobalt, or alloys thereof. The magnetic member 2 may be housed in a container 3, and housing it in the container 3 can further enhance the durability of the magnetic member 2. The container 3 may be made of a non-magnetic material, such as a resin material. The magnetic member 2 may be a magnetic member having a ferromagnetic linear structure on its surface. By having a ferromagnetic linear structure, the magnetic member can have a high magnetic flux density while not having a large difference in magnetic flux density throughout. As a result, the area with low magnetic flux density is reduced, and magnetic particles 6b are more easily attracted to the entire surface of the transport surface, thereby further increasing the collection efficiency of magnetic particles 6b. In this disclosure, the magnet is also referred to as the magnetic part, and the case is also referred to as the covering part.

[0029] The magnet 2a may be a single magnet with one end in the transport direction being the north pole and the other end being the south pole. Alternatively, the magnet 2a may be a plurality of magnets arranged in the transport direction with like poles facing each other. To obtain a stronger magnetic force from the magnet 2a on the transport surface of the transport path 4, the magnet member 2 is preferably placed close to the transport surface. However, in this case, a large difference in magnetic flux density may occur along the transport direction of the magnet member 2. Since the powder granules 6 may pass through the transport surface in clumps, magnetic particles 6b contained in the powder granules 6 that pass through areas with low magnetic flux density are less likely to be attracted to the transport surface. By interposing the magnetic linear structure 5 between the magnet member 2 and the transport path 4, the difference in magnetic flux density from the magnet member 2 is mitigated, the area with low magnetic flux density decreases, and magnetic particles 6b are more easily attracted across the entire transport surface, thereby increasing the collection efficiency of magnetic particles 6b.

[0030] An example of a method for producing granular material 6 by collecting magnetic particles 6b using a collection member 1 is described below. The granular material 6 supplied to the upper inclined surface of the conveying path 4 via the hopper 7 falls down the conveying path 4 by its own weight, towards the downstream side of the conveying direction X1, because the conveying path 4 is inclined. Since a magnetic field originating from the magnetic linear structure 5 is formed on the conveying surface of the conveying path 4, the magnetic particles 6b are attracted to the conveying surface of the conveying path 4, the magnetic particles 6b are removed, and the granular material 6 containing non-magnetic particles 6a is discharged from the bottom of the conveying path 4 and collected in the recovery unit 8. Since the magnetic linear structure 5 is provided between the conveying path 4 and the magnetic member 2, the difference in magnetic flux density is reduced across the entire conveying surface of the conveying path 4, so that a uniform magnetic field can be formed on the conveying surface, and magnetic particles 6b can be efficiently attracted and collected across the entire conveying surface of the conveying path 4.

[0031] In the illustrated example above, the magnetic linear structure 5 is formed on the lid of the case 2b that houses the magnet 2a, but the invention is not limited to this. For example, the magnetic linear structure 5 may be used as a magnetic mesh, and the magnetic mesh may be arranged on the surface of the case 2b on the transport side.

[0032] <Second Embodiment> The second embodiment will now be described with reference to the drawings. Figure 3 is a schematic diagram showing an example of a collection member of the second embodiment. The collection member 10 comprises a roller 20, a sub-roller 21, and a belt 30 installed between the roller 20 and the sub-roller 21. In the collection member 10, the surface of the belt 30 becomes the conveying surface, forming a conveying path 40. The roller 20 is a magnetic roller, and it forms a magnetic field on its outer circumferential surface. As a result, the roller 20, which is a magnetic member, is positioned on the back side of the conveying surface of the belt 30.

[0033] The roller 20 comprises a drive shaft and a magnetic member formed on the outer circumference of the drive shaft. The roller 20 may be a drive roller and is driven by a motor (not shown) to drive the belt in the conveying direction X2. The sub-roller 21 may be a driven roller.

[0034] The belt 30 includes a magnetic linear structure 35. Figures 4A to 4J show schematic cross-sectional views of several examples of the belt 30. For example, as shown in Figure 4A, the belt 30 may be linear or mesh-shaped. In another example, as shown in Figure 4B, the linear or mesh-shaped structure may be formed by an uneven surface on the surface of the belt 30 which is made of a magnetic material. In yet another example, as shown in Figure 4C, the magnetic linear structure may be arranged on the surface of the belt 30 which is made of a non-magnetic material 36. In yet another example, as shown in Figure 4D, the magnetic linear structure 35 may be arranged on the back surface opposite the conveying surface of the belt 30 which is made of a non-magnetic material 36. In yet another example, as shown in Figure 4E, the magnetic linear structure 35 may be interposed by a pair of non-magnetic material 36 belt materials. In each example, the non-magnetic material 36 may be resin, rubber, etc. In each example, as shown in Figures 4F to 4J, the recesses of the magnetic linear structure 35 may be filled with a filler 37 as described in the first embodiment, or a coating layer may be formed. The filler 37 may be resin, rubber, or the like.

[0035] The collection member 10 may be equipped with a hopper 60 on the upstream side in the conveying direction X2, and the powder granules 6 may be supplied from the hopper 60 to the conveying path 40 on the surface of the belt 30. The collection member 10 may also be equipped with a first collection section 70, a second collection section 80, and a divider 90 positioned between the first collection section 70 and the second collection section 80 on the downstream side in the conveying direction X2 for collecting the powder granules 6 falling from the rollers 20.

[0036] An example of a method for producing granular material 6 by collecting magnetic particles 6b using a collection member 10 is described below. The granular material 6 supplied to the belt 30 via the hopper 60 is conveyed in the conveying direction X2 as the belt 30 rotates due to the drive of the roller 20. When the granular material 6 reaches the roller 20 downstream in the conveying direction X2, the granular material 6 falls from the belt 30 due to the bending of the belt 30. At this time, non-magnetic particles 6a that do not contain magnetic foreign matter fall freely due to inertia from the belt 30 to a position further downstream in the conveying direction X2 than the roller 20 and are collected in the first collection unit 70. On the other hand, magnetic particles 6b are attracted to the belt 30 by magnetic force and therefore fall later than the non-magnetic particles 6a that fall from the belt 30. For example, magnetic particles 6b are attracted to the conveying surface of the belt 30 by the magnetic force of the roller 20, and are therefore attracted to the belt 30 at the bent portion of the roller 20. The magnetic force from the roller 20 increases at the bend of the belt 30 due to the increased magnetic flux density. However, after passing the bend, the magnetic particles 6b fall due to their own weight and the decrease in the magnetic force from the roller 20. If the timing of the magnetic particle 6b's fall is later than the timing of the non-magnetic particle 6a's fall, the difference in the curvature of the roller 20 causes the magnetic particle 6b to fall at the same position as the tip of the roller 20 in the conveying direction X2, or upstream, and is collected in the second collection unit 80. In areas where the roller 20 and the belt 30 are close to or in contact, a magnetic field originating from the magnetic linear structure 35 is formed on the conveying surface of the belt 30, so the magnetic particles 6b are efficiently attracted to the conveying surface of the belt 30.

[0037] By providing a divider 90 between the first collection unit 70 and the second collection unit 80, the sorting of non-magnetic particles 6a and magnetic particles 6b falling from the roller 20 can be made more efficient. The divider 90 may be positioned so that its surface is perpendicular to the transport direction X2, or it may be positioned at an angle. If it is positioned at an angle, a rotating shaft may be provided at the lower end so that the angle of inclination can be adjusted. In addition, the first collection unit 70 may be equipped with a magnetic material detector to detect whether magnetic particles 6b have entered the material.

[0038] The driving speed of the belt 30 may be 0.1 to 3.0 m / sec. By adjusting the conveying speed to the above speed, magnetic particles 6b can be collected more quickly while maintaining the efficiency of collecting them from the powder 6.

[0039] In the illustrated example above, the magnetic linear structure 35 is formed on the belt 30, but is not limited to this. For example, the magnetic linear structure 35 may be provided on the roller 20, or on both the roller 20 and the belt 30. The configuration in which the magnetic linear structure 35 is provided on the roller 20 may be described in the third embodiment described later. In the second embodiment, the same configuration may be adopted for parts common to the first embodiment described above.

[0040] <Third Embodiment> The third embodiment will now be described with reference to the drawings. Figure 5 is a schematic diagram showing an example of a collection member of the third embodiment. The collection member 110 comprises a roller 130, a magnetic member 120 inside the roller 130, and a magnetic linear structure 150 on the outer circumferential surface of the roller 130, with the outer circumferential surface of the magnetic linear structure 150 forming a transport path 140. A magnetic field is formed on one side of the curved surface of the roller 130.

[0041] The magnetic member 120 comprises a magnet 120a fixed to the side where the powder or granular material is supplied, and a support member 120b on the opposite side.

[0042] The roller 130 is driven by a motor (not shown) and rotates in the rotational direction Y. As the roller 130 rotates, the powder 6 supplied to the roller 130 is conveyed in the conveying direction X3. The roller 130 is equipped with a magnetic linear structure 150. The magnetic linear structure 150 may be a magnetic sheet, or a linear or mesh-shaped member arranged on the outer circumference of the roller 130. In the illustrated example above, the magnetic linear structure 150 is formed on the outer circumference of the roller 130, but is not limited thereto. For example, the roller 130 may be wound with a member having a configuration common to the belt 30 described in the second embodiment above. In other examples, the magnetic linear structure 150 may be integrally formed on the outer circumference of the roller 130. More specifically, a linear or mesh shape may be bonded to the outer circumference of the roller 130 using a magnetic material. In each example, the recesses of the magnetic linear structure may be filled with a non-magnetic material as described in the first embodiment above, or a coating layer may be formed.

[0043] The collection member 110 receives the powder granules 6 from above the roller 130 by free fall, and the powder granules 6 are supplied to one curved surface of the roller 130. The collection member 110 may also include a supply plate 160 for supplying the powder granules 6 to one curved surface of the roller 130. The collection member 110 may further include a first collection section 170 and a second collection section 180 for collecting the powder granules 6 falling from the surface of the roller 130, and a divider 190 positioned between them.

[0044] An example of a method for producing the powder or granular material 6 by collecting magnetic particles 6b using the collecting member 110 will be described below. The powder or granular material 6 supplied to one curved surface of the roller 130 from above the roller 130 via the supply plate 160 freely falls in the conveyance direction X3 along the conveyance path 140 under its own weight. Since non-magnetic particles 6a are not attracted by the magnetic force of the magnet 120a, when they fall from the roller 130 due to their own weight and inertia, they fall outward in the rotation direction Y of the roller 130 and are collected in the first collection unit 170. When the powder or granular material 6 comes into contact with the conveyance path 140, the magnetic particles 6b in the powder or granular material 6 are attracted to the surface of the magnetic linear structure 150 by magnetic force. Since the magnetic particles 6b fall after passing through the magnetic field formed by the magnet 120a, they fall later than the timing at which the non-magnetic particles 6a fall from the roller 130. Specifically, on the upper half curved surface of the roller 130 in the vertical direction, the magnetic particles 6b are easily attracted to the roller 130 due to the self-weight of the magnetic particles 6b and the magnetic force. On the other hand, on the lower half curved surface of the roller 130 in the vertical direction, the magnetic particles 6b fall from the roller 130 at locations where the self-weight of the magnetic particles 6b is greater than the magnetic force. By utilizing the difference in falling timing between the non-magnetic particles 6a and the magnetic particles 6b, it is preferable to predict the positions where the respective particles fall from the roller 130, and arrange the first collection unit 170 and the second collection unit 180 at the respective positions. Sorting can be performed more efficiently by interposing a divider 190 between the first collection unit 170 and the second collection unit 180. The timing at which the magnetic particles 6b fall from the roller 130 can be adjusted by the magnetic force of the magnet 120a, the material and shape of the magnetic linear structure 150, and can also be adjusted by the supply speed, supply amount, expected mixing amount of magnetic foreign matter, etc. of the powder or granular material 6, and can also be adjusted by the rotation speed of the roller 130, etc. When the magnetic force of the magnet 120a is increased, a scraper may be provided on the downstream side of the region where the non-magnetic particles 6a fall with respect to the rotation direction Y of the roller 130 to physically remove the magnetic particles 6b from the surface of the roller 130. Since the magnet 120a is arranged inside the roller 130, and a magnetic field derived from the magnetic linear structure 150 is formed in the conveyance path 140, the magnetic particles 6b are efficiently attracted to the conveyance surface of the roller 130. An example of a method for producing the powder or granular material 6 by collecting magnetic particles 6b using the collecting member 110 will be described below. The powder or granular material 6 supplied to one curved surface of the roller 130 from above the roller 130 via the supply plate 160 freely falls in the conveyance direction X3 along the conveyance path 140 under its own weight. Since non-magnetic particles 6a are not attracted by the magnetic force of the magnet 120a, when they fall from the roller 130 due to their own weight and inertia, they fall outward in the rotation direction Y of the roller 130 and are collected in the first collection unit 170. When the powder or granular material 6 comes into contact with the conveyance path 140, the magnetic particles 6b in the powder or granular material 6 are attracted to the surface of the magnetic linear structure 150 by magnetic force. Since the magnetic particles 6b fall after passing through the magnetic field formed by the magnet 120a, they fall later than the timing at which the non-magnetic particles 6a fall from the roller 130. Specifically, on the upper half curved surface of the roller 130 in the vertical direction, the magnetic particles 6b are easily attracted to the roller 130 due to the self-weight of the magnetic particles 6b and the magnetic force. On the other hand, on the lower half curved surface of the roller 130 in the vertical direction, the magnetic particles 6b fall from the roller 130 at locations where the self-weight of the magnetic particles 6b is greater than the magnetic force. By utilizing the difference in falling timing between the non-magnetic particles 6a and the magnetic particles 6b, it is preferable to predict the positions where the respective particles fall from the roller 130, and arrange the first collection unit 170 and the second collection unit 180 at the respective positions. Sorting can be performed more efficiently by interposing a divider 190 between the first collection unit 170 and the second collection unit 180. The timing at which the magnetic particles 6b fall from the roller 130 can be adjusted by the magnetic force of the magnet 120a, the material and shape of the magnetic linear structure 150, and can also be adjusted by the supply speed, supply amount, expected mixing amount of magnetic foreign matter, etc. of the powder or granular material 6, and can also be adjusted by the rotation speed of the roller 130, etc. When the magnetic force of the magnet 120a is increased, a scraper may be provided on the downstream side of the region where the non-magnetic particles 6a fall with respect to the rotation direction Y of the roller 130 to physically remove the magnetic particles 6b from the surface of the roller 130. Since the magnet 120a is arranged inside the roller 130, and a magnetic field derived from the magnetic linear structure 150 is formed in the conveyance path 140, the magnetic particles 6b are efficiently attracted to the conveyance surface of the roller 130.

[0045] The peripheral speed of the roller 130 may be 0.1 to 1.0 m / sec. By adjusting the rotation speed to the above-mentioned range, collection can be performed more quickly while maintaining the efficiency of collecting magnetic particles 6b from the powder or granular material 6.

[0046] In the third embodiment, the same configuration may be adopted for parts common to the above-described first embodiment and second embodiment.

[0047] <Method for Producing Powder or Granular Material> According to another embodiment, there is provided a method for producing powder or granular material from which magnetic foreign matters have been collected, the method comprising: transporting the powder or granular material to a transport path of a collection member using the collection member, wherein the collection member comprises the transport path for transporting the powder or granular material, a magnet member disposed on a back side opposite to a transport surface of the transport path, and a magnetic linear structure between the transport path and the magnet member; and the magnetic foreign matters are collected from the powder or granular material by an action in which the magnetic force of the magnet member attracts the magnetic foreign matters to the transport path.

[0048] <Collection Device> According to still another embodiment, there is provided a collection device for collecting magnetic foreign matters from powder or granular material, the collection device comprising: a supply unit that supplies the powder or granular material; a transport unit that transports the powder or granular material supplied from the supply unit; and a recovery unit that recovers the magnetic foreign matters collected by the transport unit, wherein the transport unit comprises a transport path for transporting the powder or granular material, a magnet member disposed on a back side opposite to a transport surface of the transport path, and a magnetic linear structure between the transport path and the magnet member.

[0049] [Second Aspect] According to the second aspect, there is provided a magnet member that can be used in the collection member of the first aspect. One embodiment thereof will be described in detail below.

[0050] According to the present embodiment, a magnet member having a ferromagnetic linear structure on a surface thereof can be provided.

[0051] The magnet material of the magnet member may be a permanent magnet, and examples thereof include KS steel, MK steel, NKS steel, alnico magnets, ferrite magnets, cobalt magnets, and neodymium magnets. The magnet member may also be an electromagnet.

[0052] The magnetic member may consist of multiple magnetic members arranged so that like poles face each other, or it may be a single magnetic member with one end being the north pole and the other the south pole, but it is preferable that multiple magnetic members are arranged together. If the magnetic member is a single magnet, the magnetic flux density decreases near the middle of the magnetic member, which can result in a large difference in magnetic flux density between each pole. By having a ferromagnetic linear structure for the magnetic member, the difference in magnetic flux density is mitigated, the region with low magnetic flux density decreases, and a high magnetic flux density can be obtained with a small difference in magnetic flux density across the entire surface of the magnetic member.

[0053] Examples of magnetic component shapes include prisms, cylinders, semicylinders, and elliptical prisms. Prisms can be polygonal prisms such as triangular prisms, square prisms, and pentagonal prisms, and may also be plate-shaped.

[0054] In this embodiment, the magnetic member has a ferromagnetic linear structure on its surface. The ferromagnetic linear structure may be a structure comprising a plurality of linear shapes, such as linear shapes or mesh shapes. A first example of the linear shapes is a plurality of linear shapes spaced apart from each other, preferably the plurality of linear shapes are parallel to each other, and preferably the pitch of the plurality of linear shapes is approximately equal. The width of one linear shape may be, for example, 0.1 to 5.0 mm, 0.1 to 3.0 mm, 0.1 to 1.0 mm, 0.3 to 1.0 mm, or 0.5 to 1.0 mm. The spacing between adjacent linear shapes may be, for example, 0.1 to 4.0 mm, 0.1 to 2.0 mm, 0.3 to 2.0 mm, or 0.5 to 1.0 mm. The narrower the width of the linear shapes and the spacing between the linear shapes are within the above ranges, the more homogenized the magnetic field of the magnetic member can be. The linear shape may have a rectangular, trapezoidal, semicircular, or V-shaped cross-section in the shorter direction. From the viewpoint of homogenizing the magnetic field of the magnetic member, it is preferable that the linear shape is substantially the same in the longer direction.

[0055] A second example of a linear shape is one in which multiple linear shapes intersect to form a mesh shape. For example, a linear shape in the first direction and a linear shape in the second direction may intersect each other to form a mesh shape. The details of the linear shapes in each direction may be those described in the first example above. For example, the mesh shape may be a grid shape, and the width and spacing of the linear shapes in the first direction and the linear shapes in the second direction may be approximately the same, and they may be perpendicular to each other. Furthermore, it is preferable that the linear shapes in the first direction and the linear shapes in the second direction are provided at 0 to 30°, 60 to 90°, 90 to 120°, or 150 to 180° with respect to the N / S direction of the magnet member, respectively. In particular, it is preferable that they are provided at 90° or 180° with respect to the N / S direction. This can further mitigate the difference in magnetic flux density. It may also be 90°±5° or 180°±5°.

[0056] When using multiple magnetic members in a row, a ferromagnetic linear structure may be formed on a predetermined surface of each magnetic member, and these ferromagnetic linear structures may be arranged on the same plane. Alternatively, a ferromagnetic linear structure may be formed integrally on the overall surface formed by combining multiple magnetic members.

[0057] The magnetic component may comprise a magnetic portion and a covering portion. In this case, the covering portion can be provided with a ferromagnetic linear structure. When a soft material is used for the magnetic portion, it may be difficult to process the surface of the magnetic portion, but by providing a covering portion, the covering portion can be used to provide the ferromagnetic linear structure.

[0058] The magnetic part is a part made of a material that itself possesses magnetic properties. The magnetic part may be the magnetic material described above, or it may be an electromagnet.

[0059] The covering portion refers to the member surrounding the magnet portion. Preferably, the covering portion includes a part made of a ferromagnetic material. Examples of ferromagnetic materials include iron, nickel, cobalt, and alloys thereof. Examples of alloys include SUS430. By covering the magnet portion with the covering portion, the strength of the magnet member can be increased even when a soft magnetic material is used for the magnet portion. Furthermore, the covering portion including the part made of a ferromagnetic material can be provided by processing the shape of the part into a ferromagnetic linear structure, or by processing the surface of the part into a ferromagnetic linear structure. It is preferable that the covering portion and the magnet portion are in contact from the viewpoint of increasing the magnetic flux density.

[0060] The covering portion may be provided on part or all of the surface of the magnet portion. For example, if the magnet portion is a rectangular prism, the covering portion may be provided on one face, multiple faces, or the entire surface of the rectangular prism. On one face of the magnet portion, the covering portion may be provided partially or entirely. For example, if the covering portion itself is a ferromagnetic linear structure, the covering portion may be attached to the magnet portion. In another example, a covering portion having a ferromagnetic linear structure on its surface may be provided on the magnet portion.

[0061] An example of a covering part is a linear ferromagnetic material that is placed on the surface of the magnet part. Examples of linear ferromagnetic materials include wires. When using a wire, the cross-sectional diameter may be, for example, 0.1 to 5.0 mm, 0.1 to 3.0 mm, 0.1 to 1.0 mm, 0.3 to 1.0 mm, or 0.5 to 1.0 mm. The linear ferromagnetic material may also be wound around the surface of the magnet part. By winding the linear ferromagnetic material in one direction, multiple linear shapes spaced apart from each other can be formed on the surface of the magnet part. By winding multiple linear ferromagnetic materials in directions intersecting each other, multiple intersecting linear shapes can be formed on the surface of the magnet part. When winding the linear ferromagnetic material around the surface of the magnet part, the spacing between adjacent linear ferromagnetic materials should be within the range described above. When the covering part is a linear ferromagnetic material, a ferromagnetic linear structure can be more easily formed on the surface of the magnet by placing it on the surface of the magnet part or winding it around it. In addition, the strength of the magnet member can be further increased.

[0062] Another example of the covering portion is a magnetic material member having a surface with a ferromagnetic linear structure. The magnetic material member may be provided on part or all of the surface of the magnet portion. The magnetic material member may be any material having a surface with a ferromagnetic linear structure, for example, it may be plate-shaped, a housing, or a housing that covers the outer circumferential surface of the magnet portion. In another example, the magnetic material member may be a box, which may cover the outer circumferential surface of the magnet portion and expose the magnet portion from at least one side. The magnetic material member may be provided on at least one side of the magnet portion. It is preferable that the covering portion and the magnet portion are in contact from the viewpoint of increasing the magnetic flux density. In yet another embodiment, if the covering portion is a housing, it is preferable that the covering portion includes a portion made of a non-magnetic material, since the magnet member cannot be housed if the entire housing is made of a ferromagnetic material. Examples of non-magnetic materials include resin materials, ceramic materials, glass, and austenitic stainless steel.

[0063] The magnetic material component should preferably have a shape that conforms to the surface of the magnet. For example, if it is placed on a flat surface of the magnet, a flat magnetic material component is suitable, and if it is placed on a curved surface of the magnet, a curved magnetic material component is suitable.

[0064] The magnetic material member may have a ferromagnetic linear structure on its surface. For example, a magnetic material member having the above-described linear shape formed on it can be used. In another example, the linear shape may be formed by forming through holes in the magnetic material member. As for the through holes, for example, multiple linear shapes that substitute for one another can be formed by providing long through holes in one direction, or through holes can be formed to form a mesh shape formed by the intersection of multiple linear shapes, such as a grid shape. The width of the linear shapes and the spacing between the linear shapes should be within the above-described range.

[0065] The magnetic material may have a ferromagnetic linear structure formed on it by processing while it is placed in the magnet. In another example, the magnetic material may have a ferromagnetic linear structure already processed on it before being placed in the magnet. These methods prevent damage to the magnetic material during processing when forming the ferromagnetic linear structure on the surface of the magnetic material, even when using a soft magnetic material in the magnet.

[0066] A magnetic member comprising a magnetic part and a covering part may be used in the same way as the magnetic member described above, by arranging multiple magnetic members side by side or by using it as a single magnetic member.

[0067] The ferromagnetic linear structure may be formed in the magnetic portion. For example, it may be formed on the surface of the portion exposed from the box-shaped outer covering.

[0068] When forming a ferromagnetic linear structure in the magnetic part, it is preferable to use a magnetic material with high strength.

[0069] If the magnet is exposed due to a through-hole being formed in the surface, it is preferable that the exposed portion be filled with a non-magnetic material. The non-magnetic material can be the one described above.

[0070] The magnetic portion and the surface portion may have a coating layer on the surface of the ferromagnetic linear structure. The coating layer may be the same as that of the magnetic linear structure in the first embodiment. By providing a coating layer, the material strength can be increased.

[0071] The magnetic component may be housed in a container. Housed in a container can further enhance the durability of the magnetic component. The container is not particularly limited, but it is preferably made of a non-magnetic material, and the non-magnetic materials described above can be used.

[0072] Some examples of magnetic members in this embodiment are shown below, but the dimensions and shape of the ferromagnetic linear structure are examples only and are not limited thereto.

[0073] Figure 6A is a cross-sectional view of an example in which a ferromagnetic wire 12a is wound around the magnet part 11 to form a ferromagnetic linear structure on the surface of the magnet part 11. In Figure 6A, the wire 12a is wound at equal intervals with gaps between them, but it may also be wound without gaps. The wire 12a may also be adhered to the magnet part. Furthermore, as shown in Figure 6B, the magnet part with the wire 12a wound around it may be housed in a container 13 made of a non-magnetic material. It is preferable that the container 13 is made of a non-magnetic material. Instead of housing it in a container 13, the surface of the wire 12a may be coated with a non-magnetic material, or the gaps between the wires 12a may be filled with a non-magnetic material. The non-magnetic material can be any of the materials mentioned above.

[0074] Figure 6C is a cross-sectional view of an example in which a magnetic part 11 and a covering part 12 are provided, and the surface of the covering part 12 covering the magnetic part 11 is processed to be uneven, thereby providing a covering part 12 with a surface having a ferromagnetic linear structure on the surface of the magnetic part 11. In the illustrated example, the covering part 12 has a ferromagnetic linear structure with multiple linear shapes on its surface, but it may be a ferromagnetic linear structure where multiple linear shapes intersect to form a mesh shape. Also, the ferromagnetic linear structure may penetrate in the thickness direction, exposing the magnetic part 11. Furthermore, the covering part 12 may have a box and a lid as separate components, and the ferromagnetic linear structure may be formed on the lid.

[0075] Figure 6D is a cross-sectional view of an example in which a ferromagnetic linear structure is formed on the surface of the magnet part 11 by processing the surface of the magnet part 11 to create an uneven surface, and this is housed in a box-shaped cover part 12. In the illustrated example, the magnet part 11 is not covered by the uneven surface of the cover part, but in order to further increase the material strength of the magnet part 11, the magnet part 11 may be completely covered by the cover part 12.

[0076] Figure 6E is a cross-sectional view of an example in which a plate-shaped member 12b having a linear shape on its surface is provided on the surface of the magnet part 11, thereby arranging a covering part 12 having a surface with a ferromagnetic linear structure on the surface of the magnet part 11, and further housing the magnet part 11 and the plate-shaped member 12b in a box-shaped container 13. The plate-shaped member 12b may be a mesh.

[0077] The magnetic member of this embodiment has a high magnetic flux density and does not exhibit large differences in magnetic flux density throughout the entire magnetic member, making it suitable for applications such as removing magnetic foreign matter such as metal fragments from powders and granules. Furthermore, it can be used in a wide range of fields as follows. For example, in magnetic separation and sorting equipment for ores, waste, and recycled materials, the minimal variation in magnetic flux density contributes to uniform separation performance throughout the entire material being processed. In addition, in precision measuring instruments such as magnetic sensors, Hall elements, nuclear magnetic resonance (NMR), and electron spin resonance (ESR), a uniform magnetic field can be secured throughout the measurement area, contributing to improved measurement accuracy and reduced errors. In the field of magnetic recording, the uniform magnetic field can contribute to improved recording density and reliability in the magnetization process of hard disks, magnetic tapes, magneto-optical disks, etc. In the medical field, application to magnetic therapy devices can contribute to improved treatment effectiveness and stabilized image quality. Furthermore, in particle accelerators and beam control devices, it can contribute to trajectory stabilization and improved focusing accuracy of electron beams and proton beams. In addition, in transport applications such as magnetic levitation transport devices and magnetic levitation trains (MAGLEV), a uniform magnetic field can contribute to achieving stable levitation and transport performance. Furthermore, in magnetization and heat treatment processes of magnetic materials, the ability to uniformly magnetize the entire product can contribute to reducing variations in product characteristics. Moreover, in research and development fields such as physics and materials science, the ability to apply a uniform magnetic field to the entire sample in magnetic property measurements, phase transition experiments, and magnetic refrigeration experiments can contribute to improving experimental accuracy.

[0078] The following describes specific embodiments of the present invention in detail with reference to examples, but the present invention is not limited to these examples.

[0079] Magnetic foreign matter was collected using the collection member shown in Figure 1 under the following conditions. Magnetic material-containing resin pellets were prepared by kneading magnetic foreign matter of the following size into magnetic material-free resin pellets. To distinguish the magnetic material-containing resin pellets from the magnetic material-free resin pellets, the magnetic material-containing resin pellets were colored white. Total number of resin pellets: 700 Number of magnetic material-free resin pellets: 690 Number of magnetic material (Fe)-containing resin pellets: 10 Size of magnetic foreign matter: 80 μm Average size of resin pellets: φ2.1 × 3.0 mm Type of resin used: PPS (polyphenylene sulfide) Surface magnetic flux density of magnet: Maximum 1.2 T Supply rate: 10.0 g / sec Length of conveying surface: 200 mm Width of conveying surface: 38 mm Material of conveying surface: SUS Inclination angle: 15° to 25° Number of experiments (N): 80

[0080] One experiment consists of transporting 700 resin pellets in total to a collection member, using resin pellets containing magnetic foreign matter with an average particle size of 80 μm and resin pellets without magnetic material. 80 experiments were conducted, and the collection ratio (n2 / n1) of the number of collected magnetic material-containing resin pellets (n2) relative to the total number of supplied resin pellets (n1) was calculated. Table 1 below shows the number of experiments that fell within a specific collection ratio range. Table 1 also shows the average number of collected pellets (the average of all 80 experiments) and its deviation (3σ). From these results, it was found that using a collection member with a mesh increased the collection rate of magnetic material-containing resin particles. Without the mesh, a flat, unprocessed SUS material was used for the transport surface. With the mesh, a mesh was provided on the transport surface. The mesh is a flat, SUS material with a grid-like linear structure on its surface. Schematic diagrams of the mesh are shown in Figures 2A and 2B. The grid-like linear structure consists of linear shapes with a width of 0.21 mm, arranged at intervals of 0.848 mm in both the conveying direction and in directions perpendicular to the conveying direction.

[0081]

[0082] Although the present invention has been described with reference to several embodiments described above, the present invention is not limited to these embodiments. Various modifications can be made to the structure and details of the present invention within the scope of the invention. This disclosure is related to the subject matter described in Japanese Patent Application No. 2025-053933, filed on 27 March 2025, and the subject matter described in Japanese Patent Application No. 2025-169333, filed on 7 October 2025, all of which are incorporated herein by reference.

[0083] 1 Collection member, 2 Magnetic member, 2a Magnet, 2b Case, 3 Container, 4 Conveyor path, 5 Magnetic linear structure, 6 Powder / granular material, 6a Non-magnetic particles, 6b Magnetic particles, 7 Hopper, 8 Recovery section, 10 Collection member, 11 Magnetic section, 12 Covering section, 12a Wire, 12b Plate-shaped member, 13 Container, 20 Roller, 21 Sub-roller, 30 Belt, 35 Magnetic linear structure, 36 Non-magnetic material, 37 Filling material, 40 Conveyor path, 60 Hopper, 70 First recovery section, 80 Second recovery section, 90 Divider, 110 Collection member, 120 Magnetic member, 120a Magnet, 120b Support member, 130 Roller, 140 Conveyor path, 150 Magnetic linear structure, 160 Supply plate, 170 First recovery section, 180 Second recovery section, 190 divider, X1 transport direction, X2 transport direction, X3 transport direction, Y rotation direction

Claims

1. A collecting member for collecting magnetic foreign matter from powder or granular material, comprising: a transport path for transporting the powder or granular material; a magnetic member disposed on the back side of the transport surface of the transport path; and a magnetic linear structure between the transport path and the magnetic member.

2. The magnetic linear structure has a plurality of linear shapes spaced apart from each other, as described in claim 1.

3. The magnetic linear structure has a mesh shape formed by the intersection of multiple linear shapes, as described in claim 1.

4. The collecting member according to claim 1, wherein the granular material comprises at least one selected from the group consisting of granules, powders, crushed material, and fibrous material.

5. The collecting member according to claim 1, wherein the magnetic foreign matter is contained in the powder separately from the main material of the powder, or is contained within or attached to the main material of the powder.

6. The collection member according to claim 1, wherein the average particle size of the magnetic foreign matter is 80 μm or more.

7. The collecting member according to claim 1, comprising a container for housing the magnetic member, wherein the magnetic linear structure is provided on the surface of the container.

8. The collection member according to claim 1, wherein the transport path is an inclined surface.

9. The collecting member according to claim 1, comprising a roller and a belt disposed on the outer circumferential surface of the roller, wherein the magnetic member is provided on the roller and the magnetic linear structure is provided on the belt.

10. The collecting member according to claim 1, comprising a roller, wherein the magnetic member is provided inside the roller, and the magnetic linear structure is provided on the outer circumferential surface of the roller.

11. The collecting member according to claim 10, wherein the magnetic linear structure is formed on the surface of the roller.

12. The collecting member according to claim 10, wherein the magnetic linear structure is a magnetic sheet and is arranged on the outer circumferential surface of the roller.

13. The collection member according to claim 10, wherein the powder or granular material is supplied to the roller by gravity from above the roller.

14. The collecting member according to any one of claims 1 to 13, wherein the magnetic member is a magnetic member having a ferromagnetic linear structure on its surface.

15. A magnetic member having a ferromagnetic linear structure on its surface.

16. The magnetic member according to claim 15, comprising a magnetic portion and a covering portion, wherein the covering portion has the ferromagnetic linear structure.

17. The magnetic member according to claim 15, comprising a magnetic part and a covering part, wherein the covering part is a linear ferromagnetic material and is arranged on the surface of the magnetic part.

18. The magnetic member according to claim 15, comprising a magnetic part and a covering part, wherein the covering part is a magnetic material member having a surface having the ferromagnetic linear structure, and is arranged on the surface of the magnetic part.

19. The magnetic member according to any one of claims 15 to 18, wherein the ferromagnetic linear structure is a plurality of linear shapes spaced apart from each other.

20. The magnetic member according to any one of claims 15 to 18, wherein the ferromagnetic linear structure is a mesh shape formed by the intersection of a plurality of linear shapes.

21. A method for producing powder or granular material from which magnetic foreign matter has been removed, comprising: transporting the powder or granular material to the transport path of the collection member using a collection member comprising: a transport path for transporting the powder or granular material; a magnetic member disposed on the back side of the transport surface of the transport path; and a magnetic linear structure between the transport path and the magnetic member, wherein the magnetic foreign matter is collected from the powder or granular material by the magnetic force of the magnetic member causing the magnetic foreign matter to be attracted to the transport path.

22. A collection device for removing magnetic foreign matter from powder or granular material, comprising: a supply unit for supplying the powder or granular material; a transport unit for transporting the powder or granular material supplied from the supply unit; and a collection unit for collecting the magnetic foreign matter collected in the transport unit, wherein the transport unit comprises: a transport path for transporting the powder or granular material; a magnetic member disposed on the back side of the transport surface of the transport path; and a magnetic linear structure between the transport path and the magnetic member.

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