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Magnetic-isolating material and flexible treatment method thereof

A processing method and magnetic isolation technology, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve the problems of affecting the service life of tools, improper control, scrapping of tool molds, etc., to improve work efficiency, Good bending effect, the effect of reducing labor intensity

Active Publication Date: 2015-05-27
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of punching cuts into the interior of the ferrite green sheet instantly through the tip of the knife, and forms a V-shaped groove on the surface of the ferrite green sheet. At the moment of punching, the tip of the knife will be subjected to a large impact force, which will seriously affect the service life of the tool. Especially when the punching depth is adjusted improperly, the tool tip is easily damaged if the tool is punched too deep, resulting in the scrapping of the entire die
[0005] At the same time, the above two patents (publication numbers: CN 101262085A, CN 102731100 A) disclose the preparation of continuous grooves or discontinuous grooves. Its side is punched out with a groove that is a certain proportion of its own thickness, which requires high precision for the punching equipment. It is usually difficult to ensure that the punching depth is equal, and the punched grooves will have different depths, and the ferrite green sheet itself Very thin, the ferrite sintered sheet is easy to crack in the deep groove after firing, and the ferrite sintered sheet is seriously broken

Method used

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  • Magnetic-isolating material and flexible treatment method thereof
  • Magnetic-isolating material and flexible treatment method thereof
  • Magnetic-isolating material and flexible treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]First, nickel-copper-zinc ferrite powder, solvent (ethanol and toluene or ethanol and xylene binary mixture), binder (polyvinyl butyral (PVB)), plasticizer (dibutyl phthalate Ester (DBP)) and other additives are ball milled and mixed into a slurry according to a certain ratio. The slurry is tape-cast and dried at 40°C to prepare a ferrite green sheet with a thickness of 0.152mm, such as figure 1 As shown, a circular roller die 1 with a diameter of 85mm is used, such as figure 2 As shown, the distance between two adjacent triangular section convex strips 2 is 2.5mm, the height of the triangular section convex strips is 1.2mm, the apex angle of the triangular section convex strips is 25 degrees, and the intersection of the triangular section convex strips 2 The gap 3 is 0.5mm, rolling one side of the ferrite green sheet, such as image 3 As shown, a V-shaped groove 4 with a depth of 0.03 mm is formed on the surface of the ferrite sheet, and the depth of the V-shaped groo...

Embodiment 2

[0035] Using the same method as Example 1 to prepare a ferrite green sheet with a thickness of 0.724 mm, a circular roller die 1 with a diameter of 105 mm is used, the distance between two adjacent triangular section convex lines 2 is 3.6 mm, and the height of the triangular section convex lines is 1.5 mm. mm, the apex angle of the triangular section convex strip is 35 degrees, the gap 3 at the intersection of the triangular section convex strip 2 is 1mm, and one side of the ferrite green sheet is rolled to form a depth of 0.23mm V-shaped groove 4, the prepared ferrite green sheet is fired at 965°C to obtain a well-fired ferrite fired sheet, and one side of the ferrite fired sheet is bonded with a PET protective film Or double-sided tape, the other side is glued with double-sided tape, and then it is rolled by a steel rod with a diameter of 6mm, and the ferrite fired sheet is divided into many small square pieces along the V-shaped groove 4 to form a Magnetic isolation materia...

Embodiment 3

[0037] Use the same method as in Example 1 to prepare a ferrite green sheet with a thickness of 0.072mm, directly burn it at 945°C to form a ferrite fired sheet, and then glue a PET protective film or double-layered ferrite sheet on one side of the ferrite fired sheet. Adhesive tape on the other side and double-sided tape on the other side, and then rolled by a steel rod with a diameter of 6mm, the ferrite fired sheet is randomly broken into many pieces, so that the final magnetic isolation material has a good bending effect. The Agilent 4991A impedance meter tests the complex permeability. When the frequency is 13.56MHz, the measured complex permeability μ′=138.4, μ″=1.86.

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Abstract

The invention discloses a magnetic-isolating material and a flexible treatment method thereof. The magnetic-isolating material comprises a ferrite sintered sheet and protective films on two side surfaces of the ferrite sintered sheet, wherein the protective films are adhered to the ferrite sintered sheet; the ferrite sintered sheet is sintered by ferrite raw sheets; different flexible treatment methods are selected according to the ferrite raw sheets with different thicknesses; when the ferrite raw sheets are 0.14-1.2mm thick, treatment is carried out by virtue of a round roller knife mold; grooves are efficiently formed in the surfaces of the ferrite raw sheets; and when the ferrite raw sheets are 0.04-0.14mm, flexible treatment of the magnetic-isolating material is sequentially reached by adopting a direct sintering method. The flexible treatment method has the beneficial effects that when the ferrite raw sheets are treated by virtue of the round roller knife mold, the grooves in the surfaces of the ferrite raw sheets are consistent in depth; and the method has the characteristic of high efficiency; the work efficiency can be effectively improved by adopting the direct sintering method when the flexibility of the magnetic-isolating material is ensured; the labor intensity is alleviated; and the final magnetic-isolating material can have a good bending effect by different methods.

Description

technical field [0001] The invention relates to the technical field related to the manufacture of magnetic materials, in particular to a magnetic isolation material and a flexible processing method thereof. Background technique [0002] In recent years, with the popularity of smart phones, Near Field Communication (NFC) technology has been applied in mobile phones. However, when the NFC antenna is placed near the mobile phone circuit board or battery, the metal material will generate eddy current phenomenon under the action of the alternating electromagnetic field, and the signal strength will be greatly weakened, which will easily lead to insensitivity in the reading process. In order to solve the above problems, a magnetic isolation material is set between the NFC antenna and the mobile phone battery. By increasing the magnetic permeability of the magnetic isolation material itself, the electromagnetic signals sent by the reader are gathered into the magnetic isolation mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/04B32B27/36C04B35/26
CPCB32B7/06B32B7/10B32B9/00B32B27/06B32B27/36C04B35/26
Inventor 於扬栋王媛珍郝斌包宇航单震
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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