JP5218294B2 - Magnetic metal foreign object capturing device, capturing system, and capturing method - Google Patents

Description

  The present invention relates to a magnetic metal foreign matter trapping device, a trapping system, a trapping method, a prepreg manufacturing method, a prepreg, and a laminate.

  Conventionally, when manufacturing a multilayer printed circuit board, one or more prepreg sheets obtained by impregnating a glass cloth base material with an epoxy resin and semi-cured are laminated on an inner layer circuit board on which a circuit is formed, and copper foil is further formed thereon. It is the mainstream to produce multilayer printed wiring boards by a build-up method in which pressure is integrally formed with a hot plate press.

Multilayer printed wiring boards are compatible with mobile devices such as mobile phones, notebook PCs, and PDAs that are constantly pursuing miniaturization and weight reduction, contributing to the realization of high-density mounting, lightness, and miniaturization. As these devices are further reduced in size and weight, demands for thinner multilayer printed wiring boards are increasing, and the materials constituting the printed wiring boards tend to be thinner.
Currently, as a material used for a printed wiring board, a prepreg obtained by impregnating a liquid substrate (coating liquid) into a fiber base material such as a glass woven fabric is used. This is manufactured by impregnating a fiber base material with a coating solution containing a thermosetting resin as a main component, heating and drying, and curing the resin component to a B-stage state. However, fine metal foreign matter generated from metal equipment in the manufacturing process may be mixed in the raw material, and when conductive foreign matter is present in the coating solution, when it is used as a printed wiring board, the interlayer and between the wiring May cause an electrical failure. In the future, electrical reliability will be required more than ever with thinner substrate materials and higher wiring density.

  As a method for removing such metal foreign matter, a method for removing metal foreign matter by arranging small magnets in a flat plate shape and allowing liquid to pass through the flat surface has been conventionally known (for example, Patent Document 1). However, the removal efficiency has not been sufficient in terms of reducing the thickness of the substrate material and increasing the wiring density.

Japanese Patent Application Laid-Open No. 11-076861

  The present invention has been made in view of the above circumstances, and a magnetic metal foreign object capturing device, a capturing system, a capturing method, and a prepreg that can efficiently remove magnetic metal foreign objects even when non-magnetic materials are mixed. It is in providing the manufacturing method of this, a prepreg, and a laminated board.

A magnetic metal foreign matter trapping device according to the present invention includes a main body having a slope and a magnet provided on the main body, and a liquid is allowed to flow from the upper part of the slope toward the lower part of the slope along the slope. A magnetic metal foreign matter capturing device that captures the magnetic metal foreign matter contained in the liquid by flowing it downstream while bringing the liquid into contact with the surface of the magnet,
On the upstream side of the magnet, there is a retention portion that retains the liquid with the inclined surface and the surface of the magnet as an inner wall surface adjacent to the magnet.

  In this magnetic metal foreign matter trapping device, on the upstream side of the magnet, there is a retaining portion for retaining the liquid having the inclined surface and the surface of the magnet as an inner wall surface adjacent to the magnet. Thereby, the liquid flowing from the upper part to the lower part of the main body stays in this staying part. By staying, the contact time with the magnet surface becomes long, and the magnetic metal foreign matter can be efficiently captured. Further, since the liquid always flows from the upstream in the staying portion, the flow of the liquid is irregular and complicated and becomes a turbulent flow. In this way, the irregular and turbulent flow causes the same liquid on the magnet surface not to always stay in the same place, but to be replaced with a new liquid, and the magnetic metal foreign matter dispersed in the liquid. Can be captured efficiently.

  Further, the liquid may flow into the staying part from the upstream side, so that the liquid overflows from the staying part, and the liquid flows further downward. Thereby, a magnetic metal foreign material can be continuously and efficiently captured.

  The magnet may be a columnar body, and may be horizontally provided on the inclined surface over the entire width of the main body so that the longitudinal direction of the columnar body is perpendicular to the liquid flow direction. Since the magnet is provided over the entire width of the main body, the surface area of the magnet in contact with the liquid is increased, so that it is possible to improve the capture efficiency of the magnetic metal foreign matter. The magnet may be a columnar body or an elliptical columnar body. Thereby, the surface area which contacts the liquid of a magnet can be enlarged more.

  Further, the staying portion may be provided on the upstream side of the inclined surface over the entire width of the magnet having the columnar structure. Thereby, the liquid flowing from the upper part to the lower part of the main body stays in this staying part. By staying, the contact time with the magnet surface becomes longer, and the magnetic metal foreign matter can be captured more efficiently. Further, in the staying portion, the liquid always flows from the upstream, so that the flow is turbulent and a turbulent state. As a result, the liquid flows in all directions, so that the surface area of the liquid in contact with the magnet surface increases, so that the magnetic metal foreign matter can be captured more efficiently.

  The depth of the deepest part of the staying part is preferably 10 mm or more as a lower limit. The upper limit is not particularly limited, but it is preferable to lengthen the residence time, which is preferably 200 mm or less, more preferably 100 mm or less, and further preferably 50 mm or less in consideration of the layout efficiency of the apparatus.

  A plurality of magnets may be provided from the upper part to the lower part of the main body. Thereby, the capture | acquisition efficiency of a magnetic metal foreign material improves.

  Further, a gap for allowing the liquid to pass through is provided on the surface of the magnet and the slope serving as the installation surface of the magnet, and the liquid flows through the two paths on the upper surface and the lower surface of the magnet. You may do it. Thereby, in addition to the upper surface of the magnet, the lower surface portion of the magnet can be used for capturing the magnetic metal foreign matter, so that the capturing efficiency can be increased. The gap is preferably 10 mm or less.

  The slope may have a staircase structure including a vertical surface and a staircase portion including a horizontal surface, and the magnet may be provided on the staircase portion. Furthermore, you may have the retention part which retains the said liquid in the area | region pinched | interposed into the perpendicular | vertical surface upstream of the said staircase, and the surface of the said magnet. Due to the staircase shape, when the liquid flows from the upper part to the lower part of the main body, the flow velocity of the liquid that reaches each step is attenuated. Therefore, it is possible to further increase the capture efficiency of the magnetic metal foreign matter. Moreover, you may have a flow volume adjustment part which adjusts so that the liquid thickness of the said liquid may become below predetermined thickness, when the said liquid passes the upper surface of the said magnet. Further, the predetermined thickness is preferably 10 mm or less.

  Moreover, it is preferable that the inclination | tilt angle of the said slope is 10 to 45 degrees. The magnet may include a position adjusting member that adjusts a size of a gap between the slope and the magnet.

  In addition, the magnetic metal foreign matter capturing device of the present invention can remove fine magnetic metal foreign matter having a particle size of 20 μm or less. In the conventional trapping device, there is no liquid retention part, and since the liquid flows from the upper part to the lower part of the magnet, the streamline is turbulent due to friction with the magnet, etc. near the magnet, At a little distance, the flow is steady and the streamlines are regular, maintaining a laminar flow. For this reason, magnetic foreign objects near the magnet are likely to be captured by the magnet due to the high probability of approaching the surface of the magnet due to the turbulence in the streamline, but laminar flow is a little away from the magnet. For this reason, the magnetic metal foreign matter mixed in the laminar flow flows in a state where the distance from the magnet is long, so that the trapping efficiency is deteriorated. In particular, it becomes more prominent when the particle size is 20 μm or less. On the other hand, in the magnetic metal foreign matter trapping device of the present invention, since the turbulent flow of liquid always occurs in the staying portion and the streamlines are turbulent, the probability that fine magnetic metal foreign matter also contacts the magnet surface. And the capture efficiency can be improved.

  A magnetic metal foreign matter trapping system according to the present invention includes a trapping device, a recovery device that recovers a downstream liquid, a transfer device that transports the recovered liquid to the upstream side again, and a supply for flowing the liquid from upstream to the trapping device. And a magnetic metal foreign object capturing system including the above-described magnetic metal foreign object capturing device. As a result, the liquid can be circulated and can be brought close to the magnet a plurality of times. Thereby, the capture efficiency of the magnetic metal foreign matter can be increased.

According to the method for capturing a magnetic metal foreign object according to the present invention, a liquid is allowed to flow from the upper part of the slope toward the lower part of the slope along the slope of the main body having a slope, and the magnet is provided on the surface of the magnet provided on the body. A method for capturing a magnetic metal foreign object that captures a magnetic metal foreign object contained in the liquid by flowing it downstream while contacting the liquid,
The liquid is retained in a retention portion that is provided upstream of the magnet and that retains the liquid adjacent to the magnet and having the inclined surface and the surface of the magnet as an inner wall surface.

  In this magnetic metal foreign matter capturing method, on the upstream side of the magnet, there is a staying part for staying the liquid with the slope and the surface of the magnet as an inner wall adjacent to the magnet, and from the upper part of the main body. The liquid that has flowed to the lower part is retained in this retaining part. Thereby, the contact time with the liquid magnet surface becomes long, and it becomes possible to provide a method for efficiently capturing the magnetic metal foreign matter. Further, in the staying portion, the liquid always flows from the upstream, so that the flow is turbulent and a turbulent state. Since the liquid flows in all directions in this way, the magnetic metal foreign matter can be efficiently captured by increasing the surface area of the liquid in contact with the magnet surface.

  In addition, the magnet may be a columnar body, and may be provided across the entire width of the main body so that the longitudinal direction of the columnar body is orthogonal to the liquid flow direction. Accordingly, since the magnet is provided over the entire width of the main body, the surface area of the magnet in contact with the liquid is increased, so that it is possible to improve the capture efficiency of the magnetic metal foreign matter. The magnet may be a columnar body or an elliptical columnar body. Thereby, the surface area which contacts the liquid of a magnet can be enlarged more.

  By pouring the liquid from the upper part of the slope into the staying part, the liquid staying in the staying part overflows from the staying part, and the overflowing liquid climbs over the magnet, Furthermore, you may make it flow toward the lower part.

  A plurality of magnets may be provided along the slope. Thereby, since the frequency | count of contact with a liquid and a magnet can be increased, it becomes possible to capture | acquire a magnetic metal foreign material efficiently.

  Further, a gap for allowing the liquid to pass is provided on the surface of the magnet and the inclined surface that is the installation surface of the magnet, and the liquid flows through two paths of an upper surface and a lower surface of the magnet, You may make it capture | acquire the said magnetic metal foreign material by contacting. The gap is preferably 10 mm or less. Thereby, in addition to the magnet directly above, the lower surface portion of the magnet can also be used for capturing the magnetic metal foreign matter, so that the capturing efficiency can be increased.

  The slope may have a staircase structure including a vertical surface and a staircase portion including a horizontal surface, and the magnet may be provided on the staircase portion. Furthermore, it is preferable to have a retention part for retaining the liquid in a region sandwiched between the upstream vertical surface of the staircase and the surface of the magnet. Due to the staircase shape, when the liquid flows from the upper part to the lower part of the main body, the flow velocity of the liquid reaching each step is attenuated, and further, since it has a staying part, the liquid and the magnet surface are separated. Since the contact time can be lengthened, it is possible to further improve the capture efficiency of the magnetic metal foreign matter. Further, when the liquid passes just above the magnet, the liquid may be flowed so that the liquid thickness is 10 mm or less.

  The magnetic metal foreign matter may include those having a particle size of 20 μm or less.

  Further, the liquid may be a coating solution or a slurry composition for applying or impregnating a base material to form a prepreg.

  Moreover, the said coating liquid can be utilized for the manufacturing method of a prepreg including the process of catching a magnetic metal foreign material. Thereby, it becomes possible to provide a prepreg.

  Moreover, the laminated board formed by shape | molding one or more of the above-mentioned prepregs can be provided.

  According to the present invention, a magnetic metal foreign matter trapping device, a trapping system, a trapping method, a prepreg manufacturing method, a prepreg, and a laminate that can efficiently remove magnetic metal foreign matter even when nonmagnetic materials are mixed are provided. Can be provided.

It is a perspective view which shows one Embodiment of the capture device of the magnetic metal foreign material of this embodiment. It is sectional drawing of the capture device of the magnetic metal foreign material which shows one Embodiment of this embodiment. FIG. 3 is an enlarged view of a region indicated by a circle I in FIG. 2. It is a perspective view which shows one Embodiment of the capture device of the magnetic metal foreign material of this embodiment. It is sectional drawing of the capture device of the magnetic metal foreign material which shows one Embodiment of this embodiment. FIG. 6 is an enlarged view of an embodiment of a region indicated by a circle II in FIG. 5. FIG. 3 is an enlarged view of a region indicated by a circle III in FIG. 1. FIG. 5 is an enlarged view of an embodiment of a region indicated by a circle IV in FIG. 4. It is a modification of the magnetic metal foreign material capture | acquisition apparatus which shows one Embodiment of this embodiment. It is a schematic diagram showing the deepest part of one Embodiment shown in FIG. It is a schematic diagram showing the deepest part of one Embodiment shown in FIG. It is sectional drawing which shows the capture device provided with the plate-shaped magnet on the slope. It is a block diagram of the acquisition system of this embodiment.

  BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments according to the magnetic metal foreign matter trapping device, trapping system, trapping method, prepreg manufacturing method, prepreg and laminate of the present invention will be described in detail below.

(First embodiment)
FIG. 1 is a perspective view showing an embodiment of a magnetic metal foreign object capturing device 100 of the present invention. In this apparatus, a liquid 400 containing a magnetic metal foreign material is introduced, and the liquid 400 in which the magnetic metal foreign material is captured by the magnet 300 is collected. In the present embodiment, the main body 200 includes four magnets 300. Further, both ends of the magnet 300 are fixed to the side walls 216 of the main body 200. In the figure, arrows indicate the flow of the liquid 400.

FIG. 2 is a cross-sectional view of the magnetic metal foreign object capturing device 100 having the inclined surface 210. The magnetic metal foreign matter capturing apparatus 100 is installed with an inclination angle θ such that the upper part 212 is upward and the lower part 214 is downward, and the main body 200 having the slope 210 so that the liquid 400 flows from the upper part 212 to the lower part 214. , And a magnet 300 provided in the main body 200. Although not shown, a recovery device that receives the liquid 400 flowing out may be provided in the lower portion 214, and the recovered liquid 400 may be transferred to flow again from the upper portion 212 of the slope 210. As described above, the efficiency of capturing the magnetic metal foreign matter contained in the liquid 400 can be improved by flowing the liquid 400 repeatedly through the magnetic metal foreign matter capturing device 100.
Further, the liquid 400 from the upper part 212 may flow from one outlet or from a plurality of outlets by providing a plurality of branches as shown in FIG. By flowing out from the plurality of outlets, substantially the same amount of liquid can be brought into contact over the entire width of the magnet 300 in the width direction. Thereby, for example, since the entire width of the magnet 300 can be used efficiently, even when the flow rate of the liquid 400 is increased, the liquid thickness 415 of the liquid 400 is locally increased when the liquid 400 passes through the upper surface of the magnet 300. Therefore, it is possible to prevent the magnetic metal foreign matter from being caught without reducing productivity (FIG. 3).
On the upstream side of the magnet 300, there is a retaining portion 410 that retains the liquid 400, which has the slope 210 and the surface of the magnet 300 as the inner wall surface, adjacent to the magnet 300. The liquid 400 that has flowed out once stays in the staying portion 410 and continues to contact the surface of the magnet 300. Furthermore, the flow 400 of the liquid 400 staying in the staying part 410 is greatly turbulent and turbulent by the continuously flowing liquid 400, and the liquid 400 that is stirred in the staying part 410 and contacts the surface of the magnet 300 is generated. Since it is constantly replaced, magnetic metal foreign matter can be efficiently captured.

  In addition, the magnet 300 for capturing the magnetic metal can be roughly divided into two different types. In other words, permanent magnets that have the properties of magnets and attract magnetic materials such as iron and stick to magnets, but they are not magnets themselves, but electromagnets that become magnets with the help of coils and other permanent magnets. Yes, either can be used. In the description of the present embodiment, the magnet 300 will be described as an example using a permanent magnet.

  Further, the liquid 400 flows into the staying part 410 from the upper part 212 of the slope 210 so that the liquid 400 flows out from the staying part 410 toward the lower part 214 of the slope 210. As a result, the liquid 400 may overflow from the staying part 410 and the liquid 400 may further flow toward the lower part 214. The liquid 400 that has flowed out is blocked by the magnet 300 provided on the downstream side, and the stirrer 410 provided on the upstream side of the magnet 300 is agitated in the same manner as described above, and continuously captures the magnetic metal foreign matter efficiently. I can do it.

  The shape of the magnet 300 is not particularly limited, but is preferably a columnar body. Further, the columnar body may be horizontally provided on the slope 210 over the entire width of the main body 200 so that the longitudinal direction of the columnar body is orthogonal to the flow direction of the liquid 400. Since the magnet 300 is provided over the entire width of the main body, the surface area of the magnet 300 with which the liquid 400 comes into contact increases, so even if a large amount of the liquid 400 flows in at a time, the magnetic metal foreign matter is efficiently captured. It becomes possible. In addition, the cross-sectional shape of the magnet 300 is not particularly limited, but a triangle, a rectangle, a polygon, a circle, an ellipse, and the like are preferable. Among these, a circular column or an elliptic column is preferable. As a result, the surface area of the magnet 300 in contact with the liquid 400 can be increased.

  The maximum diameter of the cross section of the magnet 300 is not particularly limited, but is preferably 10 mm or more and 200 mm or less, and more preferably 100 mm or less. The magnet 300 is not particularly limited, but includes an alnico magnet, a ferrite magnet, a neodymium magnet, and the like. Among these, a ferrite magnet is preferable in terms of cost and strength. The strength of the magnetic flux per unit area is not particularly limited, but is preferably 3000 gauss or more, more preferably 5000 gauss or more, and further preferably 10,000 gauss or more. If it is more than said range, a magnetic metal foreign material can be capture | acquired efficiently.

  FIG. 3 is an enlarged view of a region indicated by a circle I in FIG. As shown in FIG. 3, the staying liquid 400 overflows due to the liquid 400 flowing from the upper part 212 and passes through the upper surface of the magnet 300, and the magnet provided at the lower part of the magnet 300. 300 and a surface of the inclined surface 210 serving as the installation surface of the magnet 300 are provided with a gap 412 through which the liquid 400 passes, and the liquid 400 passing through the gap 412 becomes a second flow 416 to the lower part 214. And flow. Thereby, in addition to the upper surface of the magnet 300, the lower surface portion of the magnet 300 can also be used for capturing the magnetic metal foreign matter, so that the capturing efficiency can be increased.

Further, as shown in the cross-sectional view of FIG. 10, the deepest portion 411 of the staying portion 410 is defined as follows. The horizontal line in contact with the apex of the magnet 300 is the horizontal line Q, the vertical line in contact with the upstream side wall surface of the magnet 300 is the vertical line P, the intersection of the vertical line P and the slope 210 is A, and the intersection of the horizontal line Q and the vertical line P is B. To do. The deepest part 411 is a distance between A and B. The depth of the deepest part 411 of the staying part 410 is preferably 10 mm or more as a lower limit. The upper limit is not particularly limited, but it is preferable to lengthen the residence time, which is preferably 200 mm or less, more preferably 100 mm or less, and further preferably 50 mm or less in consideration of the layout efficiency of the apparatus. The depth of the deepest portion 411 is determined as appropriate from the layout efficiency of the apparatus. The depth of the deepest portion 411 extends perpendicularly from the slope 210 and touches the apex of the bottom surface of the magnet, and the shortest distance between the slope and the size of the gap 412. Then, depending on the gap 412, the deepest portion 411 may be larger or smaller than the vertical length of the magnet 300.
Moreover, it is preferable that the space | interval of the clearance gap 412 is 10 mm or less, More preferably, it is 5 mm or less. When the liquid 400 passes through the gap 412, the flow velocity of the liquid 400 changes, so the streamline becomes turbulent and becomes turbulent, increasing the number of times that the liquid is further agitated and contacts the surface of the magnet 300. it can. Further, as shown in FIG. 9A, ribs 417 may be provided on the slope 210 of the staying portion 410. By providing the ribs 417, the flow lines of the liquid are further disturbed, and the stirring efficiency of the liquid 400 is improved.

  A plurality of magnets 300 may be provided from the upper part 212 to the lower part 214 of the main body 200. Thereby, since the liquid 400 is agitated in the staying portions 410 adjacent to the respective magnets 300, it is possible to further improve the capture efficiency of the magnetic metal foreign matter.

  Although not shown, the liquid 400 may have a flow rate adjusting unit that adjusts the liquid 400 so that the liquid thickness 415 of the liquid 400 is equal to or less than a predetermined thickness when the liquid 400 passes through the upper surface of the magnet 300. The predetermined thickness is not particularly limited, but is preferably 10 mm or less, more preferably 5 mm or less. When passing through the upper surface of the magnet 300, the flow velocity of the liquid 400 changes near the magnet, so that the streamline becomes turbulent and becomes turbulent, increasing the number of times that the liquid 400 is further agitated and contacts the surface of the magnet 300. The trapping efficiency of foreign matters can be improved.

  The inclination angle θ of the slope 210 is not particularly limited, but is preferably 10 ° or more and 45 ° or less. The smaller the tilt angle, the lower the flow rate of the liquid 400, the longer the staying time in the staying part 410, and the longer the time during which the liquid 400 and the magnet 300 are in contact with each other. On the other hand, when the inclination angle is close to 45 °, the flow rate of the liquid 400 is increased, and the stirring of the liquid 400 in the staying part 410 becomes active, so that the stirring efficiency is improved.

  FIG. 7 is an enlarged view of a region indicated by a circle III in FIG. As shown in FIG. 7, a position adjusting member 350 that adjusts the gap 412 between the inclined surface 210 and the magnet 300 may be provided. A long hole 322 for adjusting the position of the magnet 300 is formed in the side surface of the main body 100, and is fixed at an appropriate position on the long hole 322 by a bolt 310 inserted into a screw thread formed in the magnet 300. In addition, a side wall plate 320 that seals between the main body 100 and the bolt 310 is inserted in order to prevent the liquid 400 from flowing out from the long hole 322. Further, when cleaning the capture device 100 after the removal of the magnetic metal foreign matter from the liquid 400 or removing the magnetic metal foreign matter adhering to the magnet 300, the cleaning man-hour and foreign matter are further increased by opening the gap further wide. The effect that the removal man-hour can be reduced is also born.

The magnetic metal foreign matter capturing device 100 can remove fine magnetic metal foreign matter. FIG. 12 schematically shows a capturing device 120 in which magnets 300 are spread in a plate shape without adopting the configuration of the present invention. In FIG. 12, the flow of the liquid 400 is schematically indicated by arrows. In this trapping device 120, there is no stagnation part of the liquid 400, and the liquid 400 flows from the top to the bottom of the magnet 300, so that the streamline is turbulent due to friction with the magnet, etc. However, at a little distance, the flow is steady and the streamlines have a regular shape, and the state of laminar flow 419 is maintained. Therefore, the magnetic metal foreign matter near the magnet 300 is likely to be captured by the magnet 300 due to a high probability of approaching the surface of the magnet 300 due to the disturbance of the streamline, but a laminar flow is a little away from the magnet 300. Therefore, since the magnetic metal foreign matter mixed in the laminar flow 419 flows in a state where the distance from the magnet 300 is increased, the trapping efficiency is deteriorated. In particular, it becomes more prominent when the particle size of the fine particles becomes a magnetic metal foreign material of 20 μm or less. On the other hand, in the magnetic metal foreign matter trapping apparatus 100 of this embodiment, the liquid turbulent flow 418 is always generated in the staying portion 410 and the streamlines are disturbed. The probability of contact with the surface is increased and the capture efficiency can be improved (FIG. 3).

  Here, the liquid 400 includes one obtained by dissolving a resin in a solvent, one obtained by dispersing a resin in water, and one obtained by dispersing an inorganic filler therein. Moreover, the aspect of the slurry composition which disperse | distributed the inorganic filler in the solvent or water is also included. The above-described liquid 400 is used as a coating liquid for impregnating a base material to form a prepreg for a laminate, a liquid resin composition for sealing a semiconductor or using as a buffer material, an adhesive for building materials, and the like. .

  Hereinafter, the liquid 400 will be described by taking a coating liquid impregnated in a base material to be a prepreg as an example. As a resin component which comprises a coating liquid, a thermosetting resin is preferable and it is preferable to use an epoxy resin as a thermosetting resin. Moreover, in order to express a flame retardance, what halogenated these epoxy resins can also be used together. Moreover, the heat resistance and adhesiveness when it is set as a laminated board can be improved by using a phenoxy resin.

  Epoxy resin curing agents are not particularly limited, such as amine compounds, imidazole compounds, acid anhydrides, phenol resin compounds, etc., but amine compounds can sufficiently cure epoxy resins in a small amount, and the flame retardancy of the resin Is preferable.

  In addition to the above components, fused silica, crystalline silica, aluminum hydroxide, alumina, or the like may be included as an inorganic filler in order to improve the elastic modulus, linear expansion coefficient, heat resistance, and flame resistance.

  What is necessary is just to select what does not remain in resin, after apply | coating a compounding coating liquid and drying at 80 to 180 degreeC as a solvent, For example, acetone, methyl ethyl ketone, toluene, xylene, n-hexane, methanol, Ethanol, methyl cellosolve, ethyl cellosolve, methoxypropanol, cyclohexanone, N, N dimethylformamide and the like are used.

  The slurry composition includes an organic solvent and an inorganic filler added to the organic solvent. The solvent may be at least one selected from cycloalkanones, acetone, methyl ethyl ketone, and methyl isobutyl ketone. Moreover, the emulsion composition which disperse | distributed the inorganic filler in water using the dispersing agent may be sufficient.

  As said inorganic filler, a fused silica is preferable at the point which is excellent in low thermal expansibility. The average particle size of the inorganic filler is not particularly limited, but is preferably 0.05 μm or more and 10 μm or less.

Examples of the magnetic metal foreign matter contained in the liquid 400 include the following. For example, metal containers used for preparing the coating liquid, metal piping, a stirrer for dissolving the resin component, etc., generated during the process of creating the coating liquid, and a pulverizing apparatus used for pulverizing the inorganic filler May be generated by wear, and may be partly dropped and mixed due to aging of the device. Among these, magnetic metal foreign matter exceeding several mm generated due to aging of the apparatus is removed by a filter or the like provided in the process, but several tens of metal foreign matters generated during the process or due to wear or the like are removed. It is a magnetic metal foreign material that is relatively minute, about μm. Examples of the magnetic metal foreign material include iron, nickel, cobalt, and alloys thereof.
The magnetic metal foreign object capturing device of the present invention is characterized in that it can also capture relatively minute magnetic metal foreign objects of about several tens of μm that cannot be captured by the above-described filter or the like.

(Second embodiment)
FIG. 4 shows a magnetic metal foreign matter trapping device 110 according to the second embodiment. FIG. 5 is a cross-sectional view of the magnetic metal foreign object capturing device 110 according to the second embodiment. The magnetic metal foreign object capturing device 110 has a staircase structure in which a slope includes a vertical surface 250 and a staircase portion 230 having a horizontal surface, and a magnet 300 is installed on the staircase portion 230. As shown in FIG. 5, there is a retention portion 410 that retains the liquid 400 in a region sandwiched between the upstream vertical surface 250 of the magnet 300, the surface of the magnet 300, and the stepped portion 230. Since the liquid 400 flows from the upper part 212 to the lower part 214 of the main body due to the stepped shape, the flow velocity of the liquid 400 reaching each stepped part 230 is attenuated, and further, the staying part 410 is provided. Since the time during which the liquid 400 and the surface of the magnet 300 are in contact with each other can be lengthened, it is possible to further improve the capture efficiency of the magnetic metal foreign matter.

  Further, as shown in FIG. 6, the staying liquid 400 overflows due to the liquid 400 flowing from the upper portion 212 and passes through the upper surface of the magnet 300, and the gap provided at the lower portion of the magnet 300. The second flow 416 passing through 412 flows to the lower portion 214. Thereby, in addition to the upper surface of the magnet 300, the lower surface portion of the magnet 300 can also be used for capturing the magnetic metal foreign matter, so that the capturing efficiency can be increased. The height dimension of the vertical surface 250 is appropriately determined from the layout efficiency of the device 110, but is preferably 10 mm or more and 200 mm or less, and more preferably 20 mm or more and 100 mm or less. Further, the width dimension of the staircase 230 is appropriately determined from the layout efficiency of the apparatus, but is preferably 10 mm or more and 200 mm or less, and more preferably 20 mm or more and 100 mm or less.

Next, as shown in FIG. 11, the deepest part 411 of the staying part 410 is defined as follows. The horizontal line that contacts the apex of the magnet 300 is the horizontal line S, the vertical line that contacts the upstream side wall surface of the magnet 300 is the vertical line R, the intersection of the vertical line R and the staircase 230 is C, and the intersection of the horizontal line S and the vertical line R is D And The deepest part 411 is a distance between CD. The preferable depth of the deepest portion 411 of the staying portion 410 and the effect thereof are the same as those described in the first embodiment.
In addition, when the distance between the surface of the staircase portion 230 and the lowermost surface of the magnet 300 is the gap 412, the preferable interval of the gap 412 and the effect thereof are the same as those described in the first embodiment. Further, as shown in FIG. 9B, ribs 417 may be provided on the staircase portion 230 of the staying portion 410. By providing the ribs 417, the flow lines of the liquid are further disturbed, and the stirring efficiency of the liquid 400 is improved. Although not shown, a recovery device that receives the liquid 400 flowing out may be provided in the lower portion 214, and the recovered liquid 400 may be transferred to flow again from the upper portion 212 of the slope 210. In this manner, the magnetic metal foreign matter capturing efficiency can be improved by flowing the liquid 400 repeatedly through the magnetic metal foreign matter capturing device 100.
Further, the number of outlets that are outlets of the liquid 400 from the upper portion 212 and the effects thereof are the same as those described in the first embodiment.

  Further, as shown in FIG. 5, the liquid 400 flows into the staying part 410 from the upper part 212, so that the liquid 400 flows out from the staying part 410 toward the lower part 214. The liquid 400 may overflow from the position 410 and flow toward the lower portion 214. The liquid 400 that has flowed out is once dammed up by the magnet 300 provided in the downstream staircase portion 230, and the stirrer 410 provided in the upstream side of the magnet 300 is agitated in the same manner as described above, thereby continuously and efficiently magnetizing. Metal foreign objects can be captured.

  The preferable shape, maximum diameter, magnetic flux strength, and effects thereof, such as the shape of the magnet 300, the maximum diameter of the cross section and the strength of the magnetic flux, are the same as those described in the first embodiment.

  Further, as shown in FIG. 6, the staying liquid 400 overflows due to the liquid 400 flowing from the upper part 212, and is provided in the first flow 414 that passes through the upper surface of the magnet 300 and the lower part of the magnet 300. The second flow 416 passing through the gap 412 flows to the lower portion 214. Thereby, in addition to the upper surface of the magnet 300, the lower surface portion of the magnet 300 can also be used for capturing the magnetic metal foreign matter, so that the capturing efficiency can be increased.

  As shown in FIGS. 4 and 5, the magnet 300 may be provided on each of the plurality of step portions 230 from the upper part 212 to the lower part 214 of the main body 200. Thereby, since the stirring of the liquid 400 in the staying part 410 occurs a plurality of times for each step part 230, the capture efficiency of the magnetic metal foreign matter can be further improved.

  Although not shown, the liquid 400 may have a flow rate adjusting unit that adjusts the liquid 400 so that the liquid thickness 415 of the liquid 400 is equal to or less than a predetermined thickness when the liquid 400 passes through the upper surface of the magnet 300. The predetermined thickness is not particularly limited, but is preferably 10 mm or less, more preferably 5 mm or less. When passing through the upper surface of the magnet 300, the flow velocity of the liquid 400 changes in the vicinity of the magnet, so that the streamline becomes turbulent and becomes a turbulent flow. Since it increases, the capture efficiency of magnetic metal foreign matter can be improved.

  Further, as shown in FIG. 8, the magnet 300 may have a position adjusting member 350 that adjusts the gap 412 between the stepped portion 230 and the magnet 300. A long hole 322 for adjusting the position of the magnet 300 is formed in the main body 100, and the main body 100 is fixed to an appropriate position on the long hole 322 by a bolt 310 inserted into a screw thread formed in the magnet 300. In addition, a side wall plate 320 that seals between the main body 100 and the bolt 310 is inserted in order to prevent the liquid 400 from flowing out from the long hole 322.

  The magnetic metal foreign object capturing device 110 can remove fine magnetic metal foreign objects. The effect of this is the same as described in the first embodiment.

  The preferable configuration of the liquid 400 and the effects thereof are the same as those described in the first embodiment.

  As shown in FIG. 13, the magnetic metal foreign matter capturing system according to the present invention includes a capturing device 100, a recovery device 500 that recovers a downstream liquid, a transfer device 600 that transports the recovered liquid to the upstream side again, and a liquid Is a magnetic metal foreign matter trapping system having a supply device 700 that flows from the upstream to the trapping device 100. As described above, the capturing device 100 is provided with the magnet 300 on the slope 210 of the main body 200, and on the upstream side of the magnet 300, a liquid having the slope 210 and the surface of the magnet 300 as a region is adjacent to the magnet 300. A staying part 410 for staying is provided. The liquid 400 processed by the capturing device 100 is stored in the recovery device 500. The liquid 400 stored in the collection device 500 can be transferred to the supply device 700 using the transfer device 600. The transfer device 600 includes a pipe and a transfer pump, and one end of the pipe is inserted into the liquid in the recovery device 500. Moreover, a filter may be provided in the middle of the piping so that foreign matter can be removed. The supply device 700 temporarily stores the liquid 400 transferred from the transfer device 600, adjusts the amount of liquid with a flow rate adjusting unit, and supplies the liquid to the capturing device 100. The magnetic metal foreign matter capturing system can be assembled with a device that circulates between these series of devices. Thereby, the magnetic metal foreign matter mixed in the liquid 400 can be captured efficiently.

  Next, the prepreg and the manufacturing method thereof will be described.

The prepreg of the present invention is obtained by removing magnetic metal foreign matter from the liquid 400 described above using a magnetic metal foreign matter trapping device and then applying or impregnating the substrate.
Examples of the base material used in the prepreg of the present invention include glass fiber base materials such as glass fiber cloth and glass non-woven cloth, inorganic fiber base materials such as fiber cloth and non-fiber cloth containing inorganic compounds other than glass, and aromatic polyamide resins. And organic fiber base materials composed of organic fibers such as polyamide resin, aromatic polyester resin, polyester resin, polyimide resin, and fluororesin. Among these base materials, glass fiber base materials represented by glass woven fabric are preferable in terms of strength and water absorption. The thickness of the substrate is preferably 8 μm or more and 30 μm or less. By removing minute magnetic metal foreign matter, a printed wiring board having excellent interlayer insulation can be obtained. Moreover, when it is set as a multilayer printed wiring board, it can be set as a thin multilayer printed wiring board, maintaining the rigidity of a printed wiring board.

  Examples of the method of impregnating the base material with the coating liquid obtained by the magnetic metal foreign matter capturing method of the present invention include a method of immersing the base material in the coating liquid, and a method of applying the coating liquid to the base material with various coater devices. And a method of spraying the coating liquid onto the substrate with a spray device. Among these, the method of immersing the substrate in the coating solution is preferable. Thereby, the impregnation property of the resin component with respect to a base material can be improved. In addition, when a base material is immersed in a coating liquid, a normal impregnation coating apparatus can be used.

  Next, a laminated board is demonstrated.

The laminate of the present invention is formed by molding at least one prepreg described above. Thereby, the laminated board which has the outstanding heat resistance and adhesiveness, and whose dielectric constant and dielectric loss tangent are low can be obtained.
In the case of a single prepreg, a metal foil or film is stacked on both upper and lower surfaces or one surface.
Two or more prepregs can be laminated. When two or more prepregs are laminated, a metal foil or film is laminated on the outermost upper and lower surfaces or one surface of the laminated prepregs.
Next, a laminate can be obtained by heating and pressurizing a laminate of a prepreg and a metal foil or the like.
The heating temperature is not particularly limited, but is preferably 150 to 240 ° C, and particularly preferably 180 to 220 ° C.
Moreover, the pressure to pressurize is not particularly limited, but is preferably 2 to 5 MPa, and particularly preferably 2.5 to 4 MPa.

  Hereinafter, although an example and a comparative example explain the present invention, the present invention is not limited to this.

Example 1
(1) Adjustment of coating liquid (Example 1)
In the collection tank, the prepreg resin composition was treated, dimethylformamide was added thereto, and the mixture was stirred and dissolved with a disperser to obtain 18 kg of coating solution. This coating solution was flowed at a flow rate of 3 kg / min using the magnetic metal foreign matter capturing system shown in FIG. 1 using the magnetic metal foreign matter capturing system shown in FIG. In addition, the inclination angle of the slope of the magnetic metal foreign matter trapping device was 30 °, and the workpieces were introduced from three places at the top of the slope. In addition, 10000 gauss cylindrical magnets (standard type SB φ25 width 300 mm material: SUS304, manufactured by Nippon Magnetics) were used in four rows. The deepest part was 27 mm and the gap was 2 mm. The liquid thickness on the upper surface of the magnet was adjusted to 2 mm. Under the above-mentioned conditions, the coating liquid was processed 20 times with a magnetic metal foreign matter supplement system.
After finishing this treatment, acetone was used as a solvent to wash away the coating solution adhering to the magnet. Next, the surface of the magnet was wiped off using a clean cloth, and the foreign matter adhering to the cloth was observed with an optical microscope, and it was confirmed that many magnetic metal foreign matters having a size of several μm to 50 μm were attached.

(2) Manufacture of prepreg Using the above-mentioned coating solution, glass fiber cloth (thickness 13 μm, E01Z SK made by Unitika glass fiber) is impregnated and dried in a drying oven at 190 ° C. for 7 minutes. Produced. Similarly, a glass woven fabric (thickness 90 μm, E10T SK manufactured by Unitika Glass Fiber) was used to prepare a prepreg having a thickness of 100 μm.

(3) Manufacture of Laminate Sheet An electrolytic copper foil having a thickness of 12 μm is stacked on the upper and lower sides of one prepreg and subjected to heat and pressure molding at a pressure of 4 MPa and a temperature of 220 ° C. for 180 minutes. A double-sided copper-clad laminate was obtained.

(Example 2)
As the capturing device, the magnetic metal foreign matter capturing system shown in FIG. 13 was used, and the magnetic metal foreign matter catching device shown in FIG. The height of the vertical plane was 30 mm, the width of the staircase portion consisting of a horizontal plane was 50 mm, and four magnets were installed on each of the second to fifth steps from the top with five steps. As the magnet, a 10000 Gauss cylindrical magnet (Nippon Magnetics standard model SB φ25 width 300 mm material: SUS304) was used. The deepest part was 30 mm and the gap was 2 mm. The liquid thickness on the upper surface of the magnet was adjusted to 2 mm. Except for the above, a coating solution was prepared in the same manner as in Example 1 to obtain a prepreg and a laminate.

(Comparative Example 1)
As the capturing device, the capturing device for magnetic metal foreign matter shown in FIG. 12 was used. The slope of the slope of the magnetic metal foreign matter trapping device was 30 °, and the workpieces were introduced from three places on the slope. A 10,000 gauss plate magnet (RHP-130 type standard type neodymium magnet manufactured by Nippon Magnetics) was used. Except for the above, a coating solution was prepared in the same manner as in Example 1 to obtain a prepreg and a laminate.

(Comparative Example 2)
As a capturing device, a magnet strainer (SMS-1.5 type, 5 bar magnets, 10,000 Gauss manufactured by Nippon Magnetics) was used. The magnet strainer is installed horizontally in the flow path and is not angled. Except for the above, a coating solution was prepared in the same manner as in Example 1 to obtain a prepreg and a laminate.

  The following evaluation was performed about the laminated board obtained by the Example and the comparative example. Each evaluation is shown below together with the evaluation method. The obtained results are shown in Table 1.

1. Evaluation method
(1) Interlayer insulation resistance of laminated board The 500 mm square laminated board obtained by manufacture of a laminated board was removed by etching the copper foil of the peripheral part with the width of 10 mm, and copper foil of both surfaces was not contacted. Next, the terminal was brought into contact with both surfaces of the laminate, and the insulation resistance value between the layers was measured. The resistance value was measured by applying an applied voltage of 100 V and passing 10 ⁸ Ω or more. The number of tests was 84.

As is clear from Table 1, in Examples 1 and 2, it was confirmed that the laminated product having an insulating layer thickness of 20 μm did not contain magnetic metal foreign matters of 20 μm or more in the acceptable product. In addition, since the minute magnetic metal foreign matter exceeding 100 μm was captured by the capturing device, there was no problem with all the interlayer insulation resistances for the laminated plate having an insulating layer thickness of 100 μm.
On the other hand, in Comparative Examples 1 and 2, there was a problem in insulation even with a laminated plate having a thickness of 100 μm because the removal of the minute magnetic metal foreign matter was not sufficient.

  The prepreg and laminated board of the present invention can provide a printed wiring board material having high insulation reliability even if the thickness is reduced, and is suitable as a material for high-density mounting and reduction in thickness and thickness of mobile devices.

100, 110, 120 Magnetic metal foreign matter trapping device 200 Main body 210 Slope 212 Upper 214 Lower 216 Side wall 230 Stepped portion 250 Vertical surface 300 Magnet 310 Bolt 320 Side wall plate 322 Long hole 350 Position adjusting member 400 Liquid 410 Retaining portion 411 Deepest portion 412 Gap 414 First flow 415 Liquid thickness 416 Second flow 417 Rib 418 Turbulent flow 419 Laminar flow 500 Recovery device 600 Transfer device 700 Supply device θ Slope inclination angle

Claims (27)

A main body having a slope, and a magnet provided on the main body, and the liquid is made to flow from the upper part of the slope toward the lower part of the slope along the slope, and the liquid is brought into contact with the surface of the magnet A magnetic metal foreign matter trapping device that captures magnetic metal foreign matter contained in the liquid by flowing it downstream.
The slope is a staircase structure comprising a vertical surface and a staircase portion consisting of a horizontal surface, and the magnet is provided on the staircase portion, and the slope and the slope are adjacent to the magnet on the upstream side of the magnet. An apparatus for capturing a magnetic metal foreign object, comprising a retention portion for retaining the liquid, the surface of which is the inner wall surface of the magnet.   2. The magnetic metal foreign matter trapping device according to claim 1, wherein the liquid flows into the stay part from the upper part of the slope, so that the liquid flows out from the stay part toward the lower part of the slope. apparatus.   3. The magnet according to claim 1, wherein the magnet is a columnar body, and is disposed on the inclined surface over the entire width of the main body so that the longitudinal direction of the columnar body is orthogonal to the liquid flow direction. Magnetic metal foreign matter trapping device.   The magnetic metal foreign matter capturing device according to claim 3, wherein the magnet is a columnar body or an elliptical columnar body.   5. The magnetic metal foreign matter trapping device according to claim 1, wherein a depth of a deepest portion of the staying portion is 10 mm or more and 200 mm or less.   The magnetic metal foreign matter capturing device according to claim 1, wherein a plurality of the magnets are provided from an upper part to a lower part of the main body.   The surface of the said inclined surface used as the installation surface of the said magnet and the said magnet is provided with the clearance gap for the said liquid to pass, and the said liquid flows through two paths | routes, the upper surface and the lower surface of the said magnet. The magnetic metal foreign material capturing device according to any one of the above.   The magnetic metal foreign matter capturing device according to claim 7, wherein the gap is 10 mm or less.   The magnetic metal foreign matter according to any one of claims 1 to 8, further comprising a retention portion that retains the liquid in a region sandwiched between the vertical surface on the upstream side of the staircase structure and the surface of the magnet. Capture device.   The magnetic metal foreign matter trapping device according to claim 1, further comprising a flow rate adjusting unit that adjusts the liquid thickness to be equal to or less than a predetermined thickness when the liquid passes directly above the magnet. apparatus.   The magnetic metal foreign matter capturing device according to claim 10, wherein the predetermined thickness of the liquid thickness is 10 mm or less.   The apparatus for capturing a magnetic metal foreign object according to claim 1, wherein an inclination angle of the inclined surface is 10 ° or more and 45 ° or less.   The magnetic metal foreign matter capturing device according to claim 7, wherein the magnet has a position adjusting member that adjusts a size of a gap between the inclined surface and the magnet.   The magnetic metal foreign matter capturing device according to claim 1, wherein the magnetic metal foreign matter includes one having a particle diameter of 20 μm or less.   A magnetic metal foreign matter trapping system comprising a trapping device, a recovery device for recovering a downstream liquid, a transfer device for transporting the recovered liquid to the upstream side again, and a supply device for flowing the liquid from the upstream to the trapping device. The trapping device is a magnetic metal foreign matter trapping system which is the magnetic metal foreign matter trapping device according to any one of claims 1 to 14. Flowing liquid from the upper part of the inclined surface toward the lower part of the inclined surface along the inclined surface of the main body having the inclined surface, and flowing the liquid downstream while bringing the liquid into contact with the surface of the magnet provided in the main body. A magnetic metal foreign matter capturing method for capturing a magnetic metal foreign matter contained in the liquid by:
The slope is a staircase structure including a vertical surface and a staircase portion composed of a horizontal plane, wherein the magnet is provided in the staircase portion, provided on the upstream side of the magnet, and adjacent to the magnet. And a method for trapping a magnetic metal foreign matter, wherein the liquid is retained in a retention portion where the liquid is retained with the surface of the magnet as an inner wall surface.   The magnet according to claim 16, wherein the magnet is a columnar body, and is disposed on the inclined surface over the entire width of the main body so that the longitudinal direction of the columnar body is orthogonal to the liquid flow direction. Method for capturing metallic foreign objects.   The method for capturing a magnetic metal foreign object according to claim 17, wherein the magnet is a columnar body or an elliptical columnar body.   The liquid is poured from the upper part of the slope into the staying part, the liquid staying in the staying part is overflowed from the staying part, and the overflowed liquid is passed over the magnet. The method for capturing a magnetic metal foreign object according to any one of claims 16 to 18, wherein the magnetic metal foreign substance is further caused to flow downward.   The magnetic metal foreign material capturing method according to claim 16, wherein a plurality of the magnets are provided along the slope.   A gap for allowing the liquid to pass therethrough is provided on the surface of the magnet and the inclined surface that is the installation surface of the magnet, and the liquid flows through two paths of an upper surface and a bottom surface of the magnet and contacts the magnet. 21. The method for capturing a magnetic metal foreign object according to claim 16, wherein the magnetic metal foreign object is captured.   The method for capturing a magnetic metal foreign object according to claim 21, wherein the gap is 10 mm or less.   The magnetic metal foreign matter according to any one of claims 16 to 22, further comprising a retention portion that retains the liquid in a region sandwiched between the vertical surface on the upstream side of the staircase structure and the surface of the magnet. Capture method.   The magnetic metal foreign object capturing according to any one of claims 16 to 23, wherein when the liquid passes through the upper surface of the magnet, the liquid is flowed so that the thickness of the liquid is 10 mm or less in a side view of the magnet. Method.   The method for capturing a magnetic metal foreign material according to any one of claims 16 to 24, wherein the magnetic metal foreign material includes one having a particle size of 20 µm or less.   26. The method for capturing a magnetic metal foreign object according to claim 16, wherein the liquid is a coating liquid for applying or impregnating a base material to form a prepreg, or a slurry composition. A method for producing a prepreg obtained by impregnating a base material with a coating solution obtained by the magnetic metal foreign matter capturing method according to claim 26.

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