CN110223824A - A kind of current transformer flexibility soft magnet core - Google Patents
A kind of current transformer flexibility soft magnet core Download PDFInfo
- Publication number
- CN110223824A CN110223824A CN201910485122.7A CN201910485122A CN110223824A CN 110223824 A CN110223824 A CN 110223824A CN 201910485122 A CN201910485122 A CN 201910485122A CN 110223824 A CN110223824 A CN 110223824A
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- Prior art keywords
- insulating layer
- diaphragm
- soft
- line
- current transformer
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/255—Magnetic cores made from particles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/30—Constructions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/208—Magnetic, paramagnetic
Abstract
The present invention provides a kind of current transformer flexibility soft magnet cores, including the first insulating layer and second insulating layer, alternately laminated setting soft magnetism glue-line and diaphragm between first insulating layer and second insulating layer, preparation method include preparing the first insulating layer, second insulating layer and diaphragm；Prepare soft magnetism glue-line；Alternately laminated setting soft magnetism glue-line and diaphragm between the first insulating layer and second insulating layer；The stepped construction of formation is suppressed to the step to form an entirety by the way of squeezing or being molded, belong to mutual inductor correlative technology field, current transformer flexibility soft magnet core provided by the present invention has excellent mechanical performance, it can be used directly without outsourcing insulation, it is provided simultaneously with good magnetic conductivity and lower coercivity, and detection accuracy is high；Preparation method simple process, it is easily operated.
Description
[technical field]
The present invention relates to mutual inductor correlative technology fields, and in particular to a kind of current transformer flexibility soft magnet core.
[background technique]
Current transformer is one kind of detector, can monitor the leakage current of distribution system, and be can be achieved at the same time to electric appliance
The monitoring and control of equipment provide solution for electric leakage monitoring, preventing electric fire.
Current transformer is made of iron core and winding, existing current transformer flexibility iron core by soft magnetic powder or
After particle compacting, then insulating layer is coated in outside and such as has certain flexibility to guarantee that iron core has certain mechanical performance,
But the mechanical performance of the iron core is poor, mutability and the insulation effect because of external insulation layer, asks there are detection accuracy is not accurate enough
Topic.
[summary of the invention]
In order to solve the above technical problems existing in the prior art, the present invention provides a kind of current transformer flexibility is soft
Magnetic core, the iron core are mainly prepared by soft magnetic powder, fire retardant and binder, can be directly prepared into the flexible of arbitrary shape
Iron core is not susceptible to deform, and has preferable mechanical performance, also has the characteristics that magnetic conductivity is high, coercivity is low and detectable
To minimum electric current, to achieve the goals above, technical scheme is as follows:
A kind of current transformer flexibility soft magnet core, including the first insulating layer and second insulating layer, first insulating layer
Alternately laminated setting soft magnetism glue-line and diaphragm between second insulating layer.
Further, by mass percentage, the soft magnetism glue-line include the soft magnetic powder of 5-90%, 10-95% it is viscous
Tie agent, the fire retardant of 1-5% and the curing agent of 0.5-1%.
Further, the conjunction of any one during the soft magnetic powder is iron content-nickel, iron-cobalt, iron-cobalt-nickel element combine
Gold.
Further, the soft magnetic powder is the mixed of one or more of needle-shaped, spherical, sheet, cylindrical shape
Close object.
Further, first insulating layer, second insulating layer and diaphragm are fire proofing.
Further, the binder is silicon rubber, polytetrafluoroethylene (PTFE), epoxy resin, polyimides, melamino-formaldehyde
Resin, fluorubber, butyl rubber, butadiene rubber, ethylene propylene diene rubber, in acrylic rubber any one or it is two or more
Mixture.
Further, the curing agent is aliphatic amine, aromatic amine, alicyclic ring amine, polyamide-based, modified amine
One of or two or more mixture in class, acid anhydrides.
Further, the fire retardant is phosphorus flame retardant, nitrogenated flame retardant, expansion type flame retardant, inorganic hydroxide
One of or two or more mixture in fire retardant.
The present invention also provides the preparation methods of current transformer flexibility soft magnet core as described above, including walk as follows
It is rapid:
S1: prepare the first insulating layer, second insulating layer and diaphragm；
S2: soft magnetism glue-line is prepared；
S3: alternately laminated setting soft magnetism glue-line and diaphragm between the first insulating layer and second insulating layer form stacking knot
Structure；
S4: the S3 stepped construction formed is pressed to form an entirety by the way of squeezing or being molded.
Further, the S3 includes the following steps: on the first insulating layer using any in spraying, coating, printing
The first soft magnetism glue-line is arranged in mode, and the first diaphragm is then arranged on soft magnetism glue-line, then using spraying, painting on the first diaphragm
The second soft magnetism glue-line is arranged in formula either in cloth, printing, then the second diaphragm is arranged on the second soft magnetism glue-line, the soft magnetism glue
Layer and the alternately laminated setting of the diaphragm, are finally arranged second insulating layer.
Compared to the prior art, beneficial effects of the present invention are as follows:
Mutual inductor flexibility soft magnet core provided by the present invention, is pressed into after soft magnetism glue and membrane layer are combined into stack structure
Shape has excellent mechanical performance, can be used directly without outsourcing insulation, be provided simultaneously with good magnetic conductivity and it is lower rectify
Stupid power, and have higher detection accuracy, it may detect minimum electric current (minimum to may detect na level electric current).
Preparation method provided by the present invention, preparation process is simple and condition require it is low, it is easily operated and can batch metaplasia
It produces.
[specific embodiment]
The present invention is intended to provide a kind of current transformer flexibility soft magnet core, the current transformer flexibility soft magnet core include
Dielectric layers, alternately laminated setting soft magnetism glue-line and diaphragm between dielectric layers, preferably, the thickness of dielectric layers
Degree is respectively 0.1-100 μm；The thickness of soft magnetism glue-line and diaphragm is respectively 0.1-100 μm.
As preferred embodiment, soft magnetism glue-line includes the binder and 0.5- of the soft magnetic powder of 5-90%, 10-95%
1% curing agent can increase the flame retardant effect of the iron core, keep the safety in utilization of the iron core higher；Preferably, soft magnetic powder is
The alloy of any one in the combination of iron content-nickel, iron-cobalt, iron-cobalt-nickel element, as ferrocart core, sendust, permalloy,
FERRITE CORE, silicon steel sheet, amorphous and nanometer crystal alloy etc.；During the soft magnetic powder is needle-shaped, spherical, sheet, is cylindric
One of or two or more mixture, it is preferred to use spherical soft magnetic powder can make soft magnetism glue-line more uniform, make soft magnetism
Glue can be preferably bonded with diaphragm；It is furthermore preferred that spherical soft magnetic powder partial size is 0.2-100nm, the soft magnetism of the particle size range
Powder can be fully dispersed in binder, and iron core is made to have better mechanical performance while with preferable magnetic conductivity.
First insulating layer, second insulating layer and diaphragm are fire proofing, such as fluoro-containing plastic, as polytetrafluoroethylene (PTFE),
Polyhexafluoropropylene, polytrifluorochloroethylene, perfluoroethylene-propylene etc. itself have the high molecular material of flame resisting construction, or resistance is added
Fire the high molecular material of agent, such as flame-proof PVC.
The binder is silicon rubber, polytetrafluoroethylene (PTFE), epoxy resin, polyimides, melamine resin, fluorine rubber
Glue, butyl rubber, butadiene rubber, ethylene propylene diene rubber, any one or two or more mixtures in acrylic rubber.
The curing agent is aliphatic amine, in aromatic amine, alicyclic ring amine, polyamide-based, modified amine, anhydride
One of or two or more mixture, aliphatic amine such as ethylenediamine (EDA), diethylenetriamine (DETA), triethylene
Tetramine (TETA), tetraethylenepentamine (TEPA), polyethylene polyamine (PEPA), dipropylenetriamine (DPTA), dimethylamine propylamine
(DMAPA), diethyl amino propylamine (DEAPA), hexamethylene diamine (HDA), diethylamine (DEA) etc.；Aromatic amine such as m-phenylene diamine (MPD) (m-
PDA), m-xylene diamine (MXDA), diaminodiphenyl-methane (DDM) etc.；Alicyclic ring amine such as hexahydropyridine (HHP), diamino
Hexamethylene (DAHM) etc.；Anhydride acetone tetracarboxylic dianhydride (BTDA), tetrabydrophthalic anhydride (THPA), glutaric anhydride (GA)
Deng；Modified amine such as alkyl alcoholamine, epoxy amine, modified dicyandiamine, methylol diethyl triamine etc..
The fire retardant can be in phosphorus flame retardant, nitrogenated flame retardant, expansion type flame retardant, inorganic hydroxide fire retardant
At least one, phosphorus flame retardant such as phosphate, phospho hetero phenanthrene (DOPO), phosphazene compound, organic hypophosphorous acid, organic hypophosphorous acid
Salt, ammonium polyphosphate, ammonium phosphate salt, phosphate and Quadrafos etc.；Nitrogenated flame retardant such as melamine, melamine cyanurate
(MCA) etc.；Expansion type flame retardant such as melamine polyphosphate (MPP) etc.；Inorganic hydroxide fire retardant such as aluminium hydroxide, hydrogen
Magnesia etc..
The present invention also provides the preparation methods of current transformer flexibility soft magnet core as described above, comprising the following steps:
S1: prepare the first insulating layer, second insulating layer and diaphragm；
S2: soft magnetism glue-line is prepared；
S3: alternately laminated setting soft magnetism glue-line and diaphragm between the first insulating layer and second insulating layer form stacking knot
Structure；
S4: it suppresses the S3 stepped construction formed to form an entirety by the way of squeezing or being molded.
Specifically, the S3 is specially on the first insulating layer using formula setting the either in spraying, coating, printing
Then the first diaphragm is arranged in one soft magnetism glue-line on soft magnetism glue-line, then using in spraying, coating, printing on the first diaphragm
The second soft magnetism glue-line is arranged in either type, then the second diaphragm is arranged on the second soft magnetism glue-line, the soft magnetism glue-line and it is described every
Finally second insulating layer is arranged on the last layer diaphragm or soft magnetism glue-line in the alternately laminated setting of film.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, to this
Invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, and does not have to
It is of the invention in limiting.
Embodiment 1
A kind of current transformer flexibility soft magnet core, including the first insulating layer and second insulating layer, the first insulating layer and
Alternately laminated setting soft magnetism glue-line and diaphragm between two insulating layers, in the present embodiment, the first insulating layer, second insulating layer, soft magnetism
The thickness of glue-line and diaphragm is 100 μm, and preparation method is as follows:
S1: prepare the first insulating layer, second insulating layer and diaphragm；
S2: prepare soft magnetism glue-line: by the FERRITE CORE of 5wt%, the polytetrafluoroethylene (PTFE) of 90wt%, 4wt% hydroxide
It is uniformly mixed under the DETA room temperature of aluminium and 1wt%, forms mixture；
S3: use pressure type spray gun that mixture even application manufactured in S2 on the first insulating layer, it is soft to be formed first
Magnetic glue-line；The first diaphragm is attached on the first soft magnetism glue-line, then the second soft magnetism of even application glue-line on the first diaphragm,
The second diaphragm is attached on two soft magnetism glue-lines, even application third soft magnetism glue-line, finally pastes second insulating layer on the second diaphragm
It invests on third soft magnetism glue-line, forms stepped construction；
S4: the stepped construction formed in S3 is suppressed to form an entirety, curing molding with press moulding mode；
S5: material after molding in S4 is cut into required shape, that is, current transformer flexibility soft magnet core is made.
In the present embodiment, the first insulating layer, second insulating layer and diaphragm (including the first diaphragm and second diaphragm) are poly-
Tetrafluoroethene film；Ferromagnetic powder uses partial size for the globular powder of 50-100nm.
Embodiment 2
Current transformer flexibility soft magnet core, the present embodiment and embodiment 1 are prepared using the same preparation method of embodiment 1
Difference be:
1. the component of the soft magnetism glue-line in S2 are as follows: the permalloy (wherein, nickel content 45-50%) of 10wt%,
The EDA of the fluorubber of 88wt%, the magnesium hydroxide of 1wt% and 1wt%；Mixing temperature is 100 DEG C；
2. stepped construction is pressed into an entirety by the way of squeezing in S4；
3. the first insulating layer, second insulating layer and diaphragm are polyhexafluoropropylene film；
4. the first insulating layer, second insulating layer, each soft magnetism glue-line and each diaphragm with a thickness of 0.1 μm.
Embodiment 3
Current transformer flexibility soft magnet core, the present embodiment and embodiment 1 are prepared using the same preparation method of embodiment 1
Difference be:
1. the component of the soft magnetism glue-line in S2 are as follows: the FERRITE CORE of 30wt%, the silicon rubber of 65wt%, 4wt% it is poly-
The TETA of ammonium phosphate and 1wt%；Mixing temperature is 150 DEG C；
2. stepped construction is pressed into an entirety by the way of squeezing in S4；
3. the first insulating layer, second insulating layer and diaphragm are polyhexafluoropropylene film；
4. the first insulating layer, second insulating layer, each soft magnetism glue-line and each diaphragm with a thickness of 20 μm.
Embodiment 4
Current transformer flexibility soft magnet core, the present embodiment and embodiment 1 are prepared using the same preparation method of embodiment 1
Difference be:
1. the component of the soft magnetism glue-line in S2 are as follows: the melamino-formaldehyde of the sendust powder of 50wt%, 46wt%
The PEPA of resin, the melamine of 3wt% and 1wt%；Mixing temperature is 80 DEG C；
2. stepped construction is pressed into an entirety by the way of molding in S4；
3. the first insulating layer, second insulating layer and diaphragm are polyfluorinated ethylene membrane；
4. the first insulating layer, second insulating layer, each soft magnetism glue-line and each diaphragm with a thickness of 50 μm.
Embodiment 5
Current transformer flexibility soft magnet core, the present embodiment and embodiment 1 are prepared using the same preparation method of embodiment 1
Difference be:
1. the component of the soft magnetism glue-line in S2 are as follows: the silicon steel sheet powder of 70wt%, the butyl rubber of 26wt%, 3.5wt%
MPP and 0.5wt% DPTA；Mixing temperature is 100 DEG C；
2. stepped construction is pressed into an entirety by the way of squeezing in S4；
3. the first insulating layer, second insulating layer and diaphragm are polytetrafluoroethylene film；
4. the first insulating layer, second insulating layer, each soft magnetism glue-line and each diaphragm with a thickness of 70 μm.
Embodiment 6
Current transformer flexibility soft magnet core, the present embodiment and embodiment 1 are prepared using the same preparation method of embodiment 1
Difference be:
1. the component of the soft magnetism glue-line in S2 are as follows: the silicon steel sheet of 80wt%, the polytetrafluoroethylene (PTFE) of 15wt%, 4wt% have
The EDA of machine hypophosphorous acid and 1wt%；Mixing temperature is 100 DEG C；
2. stepped construction is pressed into an entirety by the way of squeezing in S4；
3. the first insulating layer, second insulating layer and diaphragm are polyvinylidene difluoride film；
4. the first insulating layer, second insulating layer, each soft magnetism glue-line and each diaphragm thickness be 80 μm.
Embodiment 7
Current transformer flexibility soft magnet core, the present embodiment and embodiment 1 are prepared using the same preparation method of embodiment 1
Difference be:
1. the component of the soft magnetism glue-line in S2 are as follows: the sendust powder of 85wt%, 10wt% butadiene rubber,
The THPA of the DOPO and 1wt% of 4.5wt%；Mixing temperature is 200 DEG C；
2. being coated with each layer of soft magnetism glue-line by the way of coating in S3；
3. stepped construction is pressed into an entirety by the way of squeezing in S4；
4. the first insulating layer, second insulating layer and diaphragm are polytetrafluoroethylene film；
5. the first insulating layer, second insulating layer, each soft magnetism glue-line and each diaphragm with a thickness of 10 μm.
Current transformer flexibility soft magnet core prepared by embodiment 1-7 is tested with permeability measurement instrument, is tested
The results are shown in Table 1:
Current transformer flexibility soft magnet core magnetic conductivity test result prepared by 1 embodiment 1-7 of table
To sum up, as the content of soft magnetic powder increases, on the magnetic conductivity of prepared current transformer flexibility soft magnet core
On, detection accuracy is higher, and when the content of soft magnetic powder is 80wt%, magnetic conductivity highest, detection accuracy highest works as soft magnetic powder
More than 80wt%, magnetic conductivity decline, detection accuracy decline, therefore embodiment 6 asks the optimal embodiment of the present invention.
The above content is combine specific optimal technical scheme further detailed description of the invention, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For the professional technician of the technical field of the invention,
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (10)
1. a kind of mutual inductor flexibility soft magnet core, which is characterized in that including the first insulating layer and second insulating layer, described first absolutely
Alternately laminated setting soft magnetism glue-line and diaphragm between edge layer and second insulating layer.
2. mutual inductor flexibility soft magnet core according to claim 1, which is characterized in that by mass percentage, described soft
Magnetic glue-line includes the curing agent of the soft magnetic powder of 5-90%, the binder of 10-95%, the fire retardant of 1-5% and 0.5-1%.
3. current transformer flexibility soft magnet core according to claim 2, which is characterized in that the soft magnetic powder be containing
The alloy of any one in iron-nickel, iron-cobalt, iron-cobalt-nickel element combination.
4. current transformer flexibility soft magnet core according to claim 2, which is characterized in that the soft magnetic powder is needle
The mixture of one or more of shape, spherical, sheet, cylindrical shape.
5. current transformer flexibility soft magnet core according to claim 1, which is characterized in that first insulating layer,
Two insulating layers and diaphragm are fire proofing.
6. the current transformer flexibility soft magnet core according to right 1 or 2, which is characterized in that the binder be silicon rubber,
Polytetrafluoroethylene (PTFE), epoxy resin, polyimides, melamine resin, fluorubber, butyl rubber, butadiene rubber, ternary second
Any one in third rubber, acrylic rubber or two or more mixtures.
7. current transformer flexibility soft magnet core according to claim 2, which is characterized in that the curing agent is aliphatic
Amine, aromatic amine, alicyclic ring amine, polyamide-based, modified amine, one of or two or more mixing in acid anhydrides
Object.
8. current transformer flexibility soft magnet core according to claim 2, which is characterized in that the fire retardant is the resistance of phosphorus system
Fire agent, nitrogenated flame retardant, expansion type flame retardant, one of or two or more mixing in inorganic hydroxide fire retardant
Object.
9. such as the preparation method of the described in any item current transformer flexibility soft magnet cores of claim 1-8, which is characterized in that packet
Include following steps:
S1: prepare the first insulating layer, second insulating layer and diaphragm；
S2: soft magnetism glue-line is prepared；
S3: alternately laminated setting soft magnetism glue-line and diaphragm between the first insulating layer and second insulating layer form stepped construction；
S4: it suppresses the S3 stepped construction formed to form an entirety by the way of squeezing or being molded.
10. the preparation method of current transformer flexibility soft magnet core according to claim 9, which is characterized in that the S3
Include the following steps: that the first soft magnetism glue-line is arranged using formula either in spraying, coating, printing on the first insulating layer, so
First diaphragm is set on soft magnetism glue-line afterwards, then using formula setting the either in spraying, coating, printing on the first diaphragm
Two soft magnetism glue-lines, then the second diaphragm is set on the second soft magnetism glue-line, the soft magnetism glue-line and the alternately laminated setting of the diaphragm,
Second insulating layer is finally set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910485122.7A CN110223824A (en) | 2019-06-05 | 2019-06-05 | A kind of current transformer flexibility soft magnet core |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910485122.7A CN110223824A (en) | 2019-06-05 | 2019-06-05 | A kind of current transformer flexibility soft magnet core |
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| CN110223824A true CN110223824A (en) | 2019-09-10 |
Family
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| US20080258102A1 (en) * | 2007-04-17 | 2008-10-23 | Fuji Electric Device Technology Co., Ltd. | Powder magnetic core and the method of manufacturing the same |
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| CN103681633A (en) * | 2012-09-04 | 2014-03-26 | 亚德诺半导体技术公司 | Magnetic core and forming method thereof, and integrated circuit, substrate, transformer and inductor including the magnetic core |
| CN106883378A (en) * | 2017-04-16 | 2017-06-23 | 西北师范大学 | The preparation and the application in epoxy resin is prepared of the organic inorganic hybridization curing agent with fire resistance |
| CN108698369A (en) * | 2016-03-04 | 2018-10-23 | 3M创新有限公司 | Magnetic multiplayer sheet material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101501932A (en) * | 2006-08-11 | 2009-08-05 | 三井化学株式会社 | Antenna core and antenna |
| US20080258102A1 (en) * | 2007-04-17 | 2008-10-23 | Fuji Electric Device Technology Co., Ltd. | Powder magnetic core and the method of manufacturing the same |
| CN103681633A (en) * | 2012-09-04 | 2014-03-26 | 亚德诺半导体技术公司 | Magnetic core and forming method thereof, and integrated circuit, substrate, transformer and inductor including the magnetic core |
| CN108698369A (en) * | 2016-03-04 | 2018-10-23 | 3M创新有限公司 | Magnetic multiplayer sheet material |
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Application publication date: 20190910 |