CN214377843U - Low-loss magnetism-isolating sheet and magnetism-breaking equipment - Google Patents
Low-loss magnetism-isolating sheet and magnetism-breaking equipment Download PDFInfo
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- CN214377843U CN214377843U CN202023119383.4U CN202023119383U CN214377843U CN 214377843 U CN214377843 U CN 214377843U CN 202023119383 U CN202023119383 U CN 202023119383U CN 214377843 U CN214377843 U CN 214377843U
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Abstract
The utility model discloses a low-loss magnetism-isolating sheet and magnetism-breaking equipment, wherein the low-loss magnetism-isolating sheet comprises at least one layer of magnetic sheet and at least one layer of double-sided adhesive layer, and the at least one layer of magnetic sheet and the at least one layer of double-sided adhesive layer are sequentially stacked; the magnetic sheet is formed of a strip material separated into a plurality of pieces with hard insulating material disposed in gaps between the pieces. The utility model discloses can realize thoroughly blocking between the magnetic sheet unit, and then reduce the loss of magnetic isolation sheet, the lifting efficiency.
Description
Technical Field
The utility model relates to a wireless charging technology field especially relates to a low-loss magnetism separation piece and garrulous magnetism equipment.
Background
Along with the rapid development of the consumer electronics industry, electronic products have more powerful functions, wherein the wireless charging function becomes a necessary function for high-end mobile phones of various large mobile phone brand manufacturers, and compared with the traditional limited charging technology, the wireless charging has the advantages of convenience, high safety, environmental protection and the like.
In order to protect other electronic elements in the mobile phone from being interfered by an electromagnetic field generated in the wireless charging process and improve the wireless charging energy conversion efficiency, the magnetic shielding sheet becomes a necessary material in the wireless charging module, and widely applied magnetic shielding sheet materials are mainly amorphous, nanocrystalline, ferrite and the like. In order to reduce the eddy current loss generated by the magnetism isolating sheet material in the working process, the magnetism isolating sheet needs to be subjected to magnetism crushing treatment, namely, the magnetism isolating sheet is crushed to a millimeter-level unit through physical pressurization, the surface resistance of the unit is increased, the eddy current loss in the working state is reduced, the heat productivity is further controlled, and in the traditional magnetism crushing method, physical separation is not generated between units after each magnetism isolating sheet is crushed, so that the magnetism isolating sheet units are in a virtual connection state, and the effect of the magnetism crushing process is seriously influenced.
In order to solve the problems, the low-loss magnetic shield sheet is obtained, and research and development personnel perform process improvement on cracks between the magnetic sheet units. In chinese patent publication No. CN108666115A, a method for manufacturing a low-loss amorphous, nanocrystalline magnetic sheet is disclosed, which adds a passivation process after the magnetic fragmentation process, and passivates the cell interface with an oxidative passivation solution to form an oxide insulation layer on the cell surface, thereby enhancing the magnetic fragmentation effect and reducing the loss. Chinese patent publication No. CN108597849A discloses a process for breaking magnetic particles by using powder surface insulation, surface phosphating and surface oxidation, which is characterized in that phosphoric acid is used to corrode magnetic sheets to form gaps and insulating particles are filled in the gaps. The method realizes the insulating layer through chemical reaction, has higher control difficulty, has certain loss on materials and has certain limitation in use.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: a low-loss magnetic shield sheet and a magnetic shield apparatus are provided to reduce eddy current loss.
In order to solve the technical problem, the utility model discloses a technical scheme be: a low-loss magnetic separation sheet comprises at least one layer of magnetic sheet and at least one layer of double-sided adhesive layer, wherein the at least one layer of magnetic sheet and the at least one layer of double-sided adhesive layer are sequentially stacked; the magnetic sheet is formed of a strip material separated into a plurality of pieces with hard insulating material disposed in gaps between the pieces.
Further, the strip is a nanocrystalline strip or an amorphous strip.
Further, the thickness of the tape is 14 μm to 28 μm.
Further, the hard insulating material comprises a filler, wherein the Mohs hardness of the filler is 7-10, the relative dielectric constant is 1-10, and the particle size is 200nm-20 microns.
The utility model also provides a garrulous magnetism equipment that is used for preparing as above low-loss magnetism-isolating piece, including blowing axle, printing machine, the heating curing ware that sets gradually, roll, cleaning roller and receipts material roller.
Further, guide rollers are arranged between the discharging shaft and the printing machine, between the printing machine and the heating and curing device, between the heating and curing device and the rolling roller, between the rolling roller and the cleaning roller and between the cleaning roller and the material receiving roller.
Further, the printer is a screen printer.
The beneficial effects of the utility model reside in that: through set up the gap on the magnetic sheet to embedding stereoplasm insulating material in the gap, realize the absolute isolation between the piece, strengthen the effect of garrulous magnetism process, effectively reduce the eddy current loss of magnetic material under operating condition. The whole process of the magnetic crushing procedure adopts a physical method, so that the raw materials are not lost, and the control of the production process is facilitated. The utility model discloses can realize thoroughly blocking between the magnetic sheet unit, and then reduce the loss of magnetic isolation sheet, the lifting efficiency.
Drawings
Fig. 1 is a schematic cross-sectional view of a low-loss magnetic-isolating sheet according to a first embodiment of the present invention;
FIG. 2(a) is a first schematic diagram of a printed pattern;
FIG. 2(b) is a schematic view of a second printed pattern;
FIG. 2(c) is a schematic view of a third printed pattern;
fig. 3 is a schematic structural diagram of a magnetic crushing apparatus according to a third embodiment of the present invention;
fig. 4 is a schematic cross-sectional structure diagram of a soft magnetic material after a pattern is printed in the third embodiment of the present invention;
fig. 5 is a schematic cross-sectional structure view of a soft magnetic material after physical pressure is applied in the third embodiment of the present invention;
fig. 6 is a schematic cross-sectional view of a soft magnetic material after cleaning a surface according to a third embodiment of the present invention.
Description of reference numerals:
100. a magnetic sheet; 200. a double-sided adhesive layer; 300. a hard insulating material;
1. a discharging shaft; 2. a printing press; 3. a heat curing device; 4. rolling a roller; 5. a cleaning roller; 6. a material receiving roller;
10. a hard insulating material; 11. a soft magnetic material; 12. and (4) double-sided adhesive tape.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made in conjunction with the embodiments and the accompanying drawings.
Referring to fig. 1, a low-loss magnetic separation sheet includes at least one magnetic sheet and at least one double-sided adhesive layer, wherein the at least one magnetic sheet and the at least one double-sided adhesive layer are sequentially stacked; the magnetic sheet is formed of a strip material separated into a plurality of pieces with hard insulating material disposed in gaps between the pieces.
From the above description, the beneficial effects of the present invention are: through set up the gap on the magnetic sheet to embedding stereoplasm insulating material in the gap, realize the absolute isolation between the piece, strengthen the effect of garrulous magnetism process, effectively reduce the eddy current loss of magnetic material under operating condition.
Further, the strip is a nanocrystalline strip or an amorphous strip.
Further, the thickness of the tape is 14 μm to 28 μm.
Further, the hard insulating material comprises a filler, wherein the Mohs hardness of the filler is 7-10, the relative dielectric constant is 1-10, and the particle size is 200nm-20 microns.
From the above description, it can be known that the material with high hardness and low dielectric constant is used as the medium and embedded into the gap, so as to realize the absolute isolation between fragments and enhance the effect of the magnetic crushing process.
Referring to fig. 3, the present invention further provides a magnetic crushing apparatus for preparing the low-loss magnetic-isolating sheet, which comprises a discharging shaft, a printing machine, a heating and curing device, a rolling roller, a cleaning roller and a material collecting roller.
As can be seen from the above description, the whole process of the magnetic crushing process uses a physical method, no loss of raw materials is caused, and the control of the production process is facilitated.
Further, guide rollers are arranged between the discharging shaft and the printing machine, between the printing machine and the heating and curing device, between the heating and curing device and the rolling roller, between the rolling roller and the cleaning roller and between the cleaning roller and the material receiving roller.
Further, the printer is a screen printer.
Example one
Referring to fig. 1, a first embodiment of the present invention is: a low-loss magnetic separation sheet, which can be applied to a wireless charging device, as shown in fig. 1, includes at least one magnetic sheet 100 and at least one double-sided adhesive layer 200 (in this embodiment, two magnetic sheets and two double-sided adhesive layers are taken as an example), where the at least one magnetic sheet 100 and the at least one double-sided adhesive layer 200 are sequentially stacked; the magnetic sheet 100 is formed of a strip material separated into a plurality of pieces, and hard insulating materials 300 are disposed in gaps between the pieces.
The magnetic sheet comprises nanocrystalline or amorphous soft magnetic materials, and the strip is a nanocrystalline strip or an amorphous strip. Preferably, the tape has a thickness of 14 μm to 28 μm and a lamination factor of 70 to 85%.
The hard insulating material is obtained by curing and heating ink, wherein the ink comprises a filler, a dispersant, a solvent and a high polymer medium, the viscosity is 10000-20000 mPa.S, and the solid content is higher than 50%. Wherein the Mohs hardness of the filler is 7-10, the relative dielectric constant is 1-10, the particle size is 200nm-20 mu m, and the material is mainly insulating material. After curing, the solvent in the ink is removed, leaving the hard insulating material.
The embodiment realizes absolute isolation between fragments by arranging the gap on the magnetic sheet and embedding the hard insulating material in the gap, enhances the effect of a magnetic crushing process, and effectively reduces the eddy current loss of the magnetic material in a working state.
Example two
Referring to fig. 2, the second embodiment of the present invention is: a method of making a low-loss magnet-separating sheet, the method comprising the steps of:
s1: taking a magnetic separation sheet raw material, and carrying out heat treatment on the magnetic separation sheet raw material, wherein the magnetic separation sheet raw material comprises a nanocrystalline strip material or an amorphous strip material and other soft magnetic materials, is in a strip shape, has the width of 50-65mm, the thickness of 14-28 μm and the lamination coefficient of 70-85%; the Mohs hardness of the surface of the original material of the magnetic separation sheet after heat treatment is less than 6.
S2: coating glue on one surface of the original material of the magnetic separation sheet after heat treatment, and further coating double-sided glue; namely, the double-sided adhesive tape is selected as a substrate to be pasted, one surface of the original material of the magnetic separation sheet after heat treatment is pasted with the double-sided adhesive tape, and the other surface is exposed.
S3: and printing a pattern on the other surface of the heat-treated magnetic separation sheet raw material by using ink, and heating and curing to obtain the patterned hard insulating layer, wherein the ink contains nano-scale fillers with high hardness and low dielectric constant. Printing on the exposed surface of the magnetic shielding sheet raw material, then curing by a heating curing device, removing the solvent in the cured ink, and keeping the hard insulating material.
The printing process of the step comprises printing modes such as silk-screen printing, embossing and the like, and the used ink comprises a filler, a dispersing agent, a solvent and a high molecular medium, the viscosity is 10000-20000 mPa.S, and the solid content is higher than 50%.
Wherein the Mohs hardness of the filler is 7-10, the relative dielectric constant is 1-10, the particle size is 200nm-20 mu m, and the material comprises at least one of silicon dioxide, silicon nitride, zirconium oxide, aluminum oxide and cubic boron nitride; the volume fraction of the filler in the ink is 40-60%.
The dispersant includes but is not limited to silicone-based high molecular polymer and polysiloxane mixture with hydrophobic particles; the volume fraction of the dispersant in the ink is 0.3-3%.
Such solvents include, but are not limited to, propylene glycol monomethyl ether acetate, n-butyl hexanoate, dibutyl phthalate, 1, 2-propanediamine, cyclohexanone, 3,5, 5-trimethyl-2-cyclohexen-1-one, dimethyl succinate, dimethyl adipate, and dimethyl glutarate; the volume fraction of the solvent in the ink is 25-50%.
The high molecular medium can be acrylic resin, such as acrylic resin, solvent-free epoxy resin or saturated polyester resin; the volume fraction of the polymer medium in the ink is 10-20%.
The printed pattern includes a plurality of unit patterns arranged in a display, each unit pattern having a size of 1mm to 10mm, and the shapes of the unit patterns include a triangle, a square, a hexagon, a circle, and the like. For example, when the cell pattern is hexagonal, the printed pattern is as shown in fig. 2 (a); when the unit pattern is a square, the printed pattern is as shown in fig. 2 (b); when the unit pattern is triangular, the printed pattern is as shown in fig. 2 (c). Further, the overall pattern width needs to be larger than the width of the soft magnetic material.
S4: and pressing the surface of the original antimagnetic sheet material with the hard insulating layer to crack the original antimagnetic sheet material in the area covered by the hard insulating material layer, and embedding the hard insulating material in the solidified hard insulating layer into the crack.
Specifically, a smooth roll or a flat press plate is used to press the surface of the magnetic separator sheet raw material with the hard insulating layer, so that the magnetic separator sheet raw material in the hard insulating layer covering region is fractured, i.e., the soft magnetic material under the hard insulating material is fractured, and the hard insulating material is crushed and embedded into the cracks, thereby preventing the re-contact between the fractured soft magnetic material fragment units.
S5: and cleaning the surface of the original material of the magnetism isolating sheet after being pressed, and removing the hard insulating material which is not embedded into the crack to obtain the single-layer magnetism isolating sheet after being crushed.
After step S4, a part of the hard insulating material in the hard insulating layer is embedded in the crack, and a part of the hard insulating material remains on the surface of the magnetic shield raw material, and the surface is cleaned to remove the hard insulating material that is not embedded in the crack, thereby obtaining a single-layer magnetic shield after magnetic fragmentation.
S6: and (3) carrying out laminating and patterning operation on the N single-layer magnetism isolating sheets after magnetism crushing to obtain the magnetism isolating sheets, wherein N is an integer greater than or equal to 1.
Specifically, the single-layer magnetism-isolating sheet is subjected to laminating operation and shape cutting processing according to product requirements to obtain a target product.
In the embodiment, a material with high hardness and low dielectric constant is used as a medium, patterning is realized on the surface of a soft magnetic material through a printing technology, the soft magnetic material printed with a hard insulating material is cracked in the subsequent physical pressure application process, the hard insulating material is filled into cracks, absolute isolation among soft magnetic material fragment units is realized, the effect of a magnetic crushing process is enhanced, and eddy current loss of the soft magnetic material in a working state is effectively reduced.
The method has the advantages of simple process, good consistency, suitability for continuous mass production, effective separation of the magnetic sheet units, reduction of the loss of the magnetic separation sheet, no loss of the soft magnetic material due to the physical method in the whole process, and contribution to the control of the production process.
EXAMPLE III
Referring to fig. 2 to 6, a third embodiment of the present invention is a magnetic breaking apparatus, which can be used for implementing the magnetic breaking process in the process of preparing the low-loss magnetic separation sheet of the first embodiment, i.e., steps S3 to S5 of the second embodiment, as shown in fig. 3, and includes a discharging shaft 1, a printing machine 2, a heating and curing device 3, a rolling roller 4, a cleaning roller 5 and a material receiving roller 6, which are sequentially disposed. Wherein, the printing machine adopts a screen printing machine.
Further, guide rollers are arranged between the discharging shaft and the printing machine, between the printing machine and the heating and curing device, between the heating and curing device and the rolling roller, between the rolling roller and the cleaning roller and between the cleaning roller and the material receiving roller.
And placing the soft magnetic material coil covered with the double-sided adhesive tape substrate on a discharging shaft, discharging the strip-shaped material from the discharging shaft, passing the strip-shaped material through a guide roller, entering a screen printing machine, then entering a heating curing device, discharging the material from the heating curing device, entering a rolling roller, passing through a cleaning roller, and finally receiving a material receiving roller.
Specifically, a pattern screen plate (as shown in fig. 2) is selected in a screen printing machine, and the prepared ink is used for screen printing, so that the ink realizes patterning on the surface of the soft magnetic material. The soft magnetic material printed with the ink is then conveyed to a heating and solidifying device through a guide roller for solidification, the solvent in the ink is removed after solidification, the hard insulating material is remained, the soft magnetic material covered with the hard insulating material is pressed out of cracks in a rolling roller, and then the hard insulating material is embedded into the cracks to prevent fragments from being contacted again. And removing the hard insulating material remained on the surface of the soft magnetic material by a cleaning roller, and collecting the soft magnetic material into a material collecting roller.
The screen patterns and parameters used in the screen printer are shown in table 1.
Table 1: screen pattern and parameters for screen printing machine
| Pattern(s) | Unit pattern size | Wire diameter | Mesh size | Thickness of photosensitive resist | |
| Example 1 | Hexagon (FIG. 2(a)) | 5mm | 1mm | 0.075mm | 35um |
| Example two | Square shape (FIG. 2(b)) | 5mm | 0.75mm | 0.075mm | 35um |
| Example three | Square shape (FIG. 2(b)) | 3mm | 0.75mm | 0.075mm | 35um |
| Example four | Square shape (FIG. 2(b)) | 2mm | 0.75mm | 0.075mm | 35um |
| Example five | Triangle (fig. 2(c)) | 2mm | 0.75mm | 0.075mm | 35um |
In the embodiment, the printing ink used for silk-screen printing mainly comprises a filling material zirconia, the particle size range is 500nm-2 μm, and the filling proportion is 48 wt%; the solvent is selected from a mixture of three solvents of dimethyl succinate, dimethyl adipate and dimethyl glutarate, and the proportion of the solvent in the ink is 40 wt%; the polymer medium is methyl methacrylate, and the proportion is 10 percent by weight; the dispersant is sodium dodecyl benzene sulfonate with the proportion of 2 percent by weight. The ink was milky white and had a viscosity of 12000 mPaS.
Fig. 4-6 show the variation of the soft magnetic material during the magnetic fragmentation described above. As shown in fig. 4, after the printing and curing processes, the hard insulating material 10 is deposited on the surface of the soft magnetic material 11 in a fixed shape of a granular shape. As shown in fig. 5, after physical pressing, the soft magnetic material 11 under the hard insulating material 10 is broken, the hard insulating material 10 is embedded into cracks, and the whole materials are connected by the double-sided adhesive 12 under the soft magnetic material 11. The hard insulating material 10 remaining on the surface of the soft magnetic material 11 was removed to obtain a single-layer magnetic-shielding sheet after magnetic crushing as shown in fig. 6. And then, the lamination operation and the shape patterning processing can be carried out according to the requirements of the product.
Table 2 shows the permeability and magnetic loss performance of the product at a frequency of 100KHz, and the permeability of the product can be freely adjusted by using mesh plates with different sizes and patterns.
Table 2: permeability and magnetic loss performance at 100KHz frequency for each example product
| Magnetic conductivity (100KHz) | Magnetic loss (100KHz) | |
| Example 1 | 2000 | 150 |
| Example two | 2200 | 180 |
| Example three | 1500 | 80 |
| Example four | 1000 | 40 |
| Example five | 800 | 25 |
To sum up, the utility model provides a pair of low-loss magnetism separation piece and garrulous magnetism equipment is through setting up the gap on the magnetic sheet to embedding stereoplasm insulating material in the gap, realizing the absolute isolation between the piece, the effect of the garrulous magnetism process of reinforcing effectively reduces the eddy current loss of magnetic material under operating condition. The whole process of the magnetic crushing procedure adopts a physical method, so that the raw materials are not lost, and the control of the production process is facilitated. The utility model discloses can realize thoroughly blocking between the magnetic sheet unit, and then reduce the loss of magnetic isolation sheet, the lifting efficiency.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (7)
1. The low-loss magnetism-isolating sheet is characterized by comprising at least one layer of magnetic sheet and at least one layer of double-sided adhesive layer, wherein the at least one layer of magnetic sheet and the at least one layer of double-sided adhesive layer are sequentially stacked; the magnetic sheet is formed of a strip material separated into a plurality of pieces with hard insulating material disposed in gaps between the pieces.
2. The low loss magnetic separator sheet according to claim 1 wherein said tape is nanocrystalline or amorphous.
3. The low loss magnet-separating sheet according to claim 1 wherein said tape has a thickness of from 14 μm to 28 μm.
4. The low-loss magnetism-isolating sheet according to claim 1, wherein the hard insulating material comprises a filler having a Mohs hardness of 7 to 10, a relative dielectric constant of 1 to 10, and a particle size of 200nm to 20 μm.
5. A magnetic fragmentation device for preparing low loss magnetic separator sheets as claimed in any of claims 1 to 4 comprising a discharge shaft, a printer, a thermal solidifier, a roller, a cleaning roller and a take-up roller arranged in sequence.
6. A magnetic crushing and crushing device according to claim 5, wherein guide rollers are arranged between the feeding shaft and the printer, between the printer and the heating and solidifying device, between the heating and solidifying device and the rolling roller, between the rolling roller and the cleaning roller and between the cleaning roller and the receiving roller.
7. A magnetic comminution apparatus as claimed in claim 5 in which the printer is a screen printer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023119383.4U CN214377843U (en) | 2020-12-22 | 2020-12-22 | Low-loss magnetism-isolating sheet and magnetism-breaking equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023119383.4U CN214377843U (en) | 2020-12-22 | 2020-12-22 | Low-loss magnetism-isolating sheet and magnetism-breaking equipment |
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| Publication Number | Publication Date |
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| CN214377843U true CN214377843U (en) | 2021-10-08 |
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| CN202023119383.4U Active CN214377843U (en) | 2020-12-22 | 2020-12-22 | Low-loss magnetism-isolating sheet and magnetism-breaking equipment |
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