Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of electromagnetic shielding sheet and its preparation method and application

A technology of electromagnetic shielding and shielding sheet, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems of limited improvement of electromagnetic performance, achieve uniform performance, improve charging efficiency, and simple operation

Active Publication Date: 2020-06-09
HENGDIAN GRP DMEGC MAGNETICS CO LTD
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can control the electromagnetic performance of the electromagnetic shielding sheet to a certain extent through the graphics processing technology and improve the charging efficiency, the improvement of the electromagnetic performance is still limited.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of electromagnetic shielding sheet and its preparation method and application
  • A kind of electromagnetic shielding sheet and its preparation method and application
  • A kind of electromagnetic shielding sheet and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] (1) Fix the nanocrystalline shielding sheet on the vacuum adsorption platform, carry out rolling holes by punching with thimbles, and process the original strip into a honeycomb shape to obtain a patterned nanocrystalline shielding sheet; the diameter of the inscribed circle of the thimble is 50 μm, The shape of the thimble is circular, the width of the nanocrystalline shielding sheet is 60mm, and the adsorption platform is 80mm*80mm. The thimble is vertically arranged on the stamping head of 80*80mm. The quantity is 6400 pieces;

[0084] (2) Annealing: annealing the patterned nanocrystalline shielding sheet to obtain the annealed nanocrystalline shielding sheet; the temperature of the annealing treatment is 600° C., and the holding time of the annealing treatment is 120 minutes;

[0085] (3) Fragmentation: The annealed nanocrystalline shielding sheet covered with silica gel is fragmented to cause cracks on the surface of the annealed nanocrystalline shielding sheet to ...

Embodiment 2

[0090] This embodiment provides an electromagnetic shielding sheet, and the electromagnetic shielding sheet includes a nanocrystalline shielding sheet.

[0091] The surface of the nanocrystalline shielding sheet is provided with a honeycomb pattern formed by punching with a thimble, the surface of the nanocrystalline shielding sheet is covered with cracks, and insulating powder is filled inside the honeycomb pattern and the inside of the cracks.

[0092] Wherein, the nanocrystalline shielding sheet has a length of 60 mm, a width of 60 mm, and a thickness of 20 μm.

[0093] The surface of the nanocrystalline shielding sheet is provided with a honeycomb pattern formed by stamping with a thimble, the shape of the thimble is hexagonal, the diameter of the inscribed circle of the thimble is 70 μm, and the axial distance of the thimble is 2000 μm. The number of said thimbles is 18,000.

[0094] The surface of the nanocrystalline shielding sheet is covered with cracks, and the size ...

Embodiment 3

[0103] This embodiment provides an electromagnetic shielding sheet, and the electromagnetic shielding sheet includes a nanocrystalline shielding sheet.

[0104] The surface of the nanocrystalline shielding sheet is provided with a honeycomb pattern formed by punching with a thimble, the surface of the nanocrystalline shielding sheet is covered with cracks, and insulating powder is filled inside the honeycomb pattern and the inside of the cracks.

[0105] The electromagnetic shielding sheet includes multiple layers of nanocrystalline shielding sheets, and adjacent nanocrystalline shielding sheets are attached by double-sided adhesive tape.

[0106] Wherein, the nanocrystalline shielding sheet has a length of 40 mm, a width of 80 mm, and a thickness of 15 μm.

[0107] The surface of the nanocrystalline shielding sheet is provided with a honeycomb pattern formed by stamping with a thimble, the shape of the thimble is circular, the diameter of the inscribed circle of the thimble i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
lengthaaaaaaaaaa
widthaaaaaaaaaa
Login to View More

Abstract

The invention provides an electromagnetic shielding sheet. The electromagnetic shielding sheet comprises a nanocrystalline shielding sheet, wherein the surface of the nanocrystalline shielding sheet is provided with a honeycomb-shaped pattern formed by thimble stamping; and the diameter of a thimble-shaped inscribed circle is 50 to 90 [mu]m. The invention also provides a preparation method of theelectromagnetic shielding sheet. The preparation method comprises the following steps: selecting a nanocrystalline shielding sheet; and performing graphical treatment, annealing treatment, one-side coating treatment, fragmentation treatment and insulation filling treatment on the nanocrystalline shielding sheet in sequence. A plurality of electromagnetic shielding sheets being subjected to insulation filling can also be bonded according to process requirements. The treatment method is simple in process, and low in cost. Moreover, the treated electromagnetic shielding sheet has high magnetic conductivity, and can reduce eddy current loss. The performance of the electromagnetic shielding sheet is effectively improved.

Description

technical field [0001] The invention belongs to the field of magnetic materials and relates to a magnetic material, in particular to an electromagnetic shielding sheet and its preparation method and application. Background technique [0002] With the development of the mobile phone 5G era, the field of wireless charging products is developing in the direction of high charging efficiency, low eddy current loss, low heat generation during charging, and increased charging sensing distance. However, many technical difficulties have also been encountered during the development process, such as improving Charging efficiency, cost reduction, and effective charging distance are too short. [0003] In order to obtain higher charging efficiency and reduce or eliminate the influence of the electromagnetic field on the mobile phone during charging, it is necessary to use a battery shielding sheet for shielding. The function of the electromagnetic shielding sheet is to isolate electroma...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00
CPCH05K9/0081
Inventor 毛石武顾小建关旺赵俊朱权
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD