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Preparation method of offset magnetic sheet in hard acoustic-magnetic anti-theft label

A technology of hard tags and magnetic sheets, applied in the direction of magnetic materials, magnetic objects, and the magnetism of inorganic materials

Active Publication Date: 2011-08-31
GUANGZHOU QIDA MATERIAL & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the prior art acoustomagnetic hard tags that adopt the magnetic unlocking method will fail due to the strong magnetic field of the unlocker during the repeated unlocking process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The bias magnetic sheet is made of neodymium-iron-boron rubber and plastic sheet. In the rubber sheet, the content of neodymium-iron-boron powder is 60%, the modified rubber binder is polyisobutylene rubber, and the content of silane coupling agent is 1.0%. %, epoxy resin 1.0%, other processing aids 1.5%. Mix NdFeB powder with modified rubber binder and processing aids, knead evenly in an open mill, and then make a rubber-plastic plate with a thickness of 0.4mm on a calender, and cut the bias magnetic sheet into a length of 26mm. Rectangular sheet with a width of 6 mm is used in the acoustic magnetic label, the coercive force of the bias magnetic sheet is 800KA / M, the magnetic field strength is 12KA / M, and a 0.30mm thick PE plastic diaphragm is added between the bias magnetic sheet and the amorphous resonant sheet.

[0018] The locking device is a magnetic locking device, which is composed of a locking steel ball, a spring and a bracket. The locking process is to insert...

Embodiment 2

[0020] With the method of embodiment 1, the difference is: the bias magnetic sheet is made of neodymium-iron-boron rubber plastic sheet, by weight percentage, the content of neodymium-iron-boron powder is 25%, and the modified rubber binder is polyisobutylene rubber content 70.5%, processing aid content 4.5%; processing aids are silane coupling agent, epoxy resin, organic peroxide; made of rubber and plastic plate with a thickness of 1.0 mm, cut to grow 30 mm, width 6 mm, thickness 1.0 mm mm rectangular flakes. The coercive force of the bias magnetic sheet is 800KA / M, and the magnetic field strength is 9KA / M. Thereafter, a bias magnetic sheet is stacked on the amorphous resonant sheet. There is no diaphragm between the bias magnetic sheet and the amorphous resonant sheet.

[0021] The present invention is not only applicable to the existing sizes of the amorphous resonator sheet and the bias magnetic sheet, but also applicable to other sizes.

[0022] The present invention ...

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Abstract

The invention relates to an offset magnetic sheet in a hard acoustic-magnetic anti-theft label, a preparation method. The off-center magnetic sheet is a neodymium, ferrum and boron plastic sheet prepared from powdered neodymium, ferrum and boron, modified rubber adhesive and processed auxiliary agent. The coercive force of the offset magnetic sheet is from 800 KA / M to 1000 KA / M, and the magnetic intensity is from 8 KA / M to 16 KA / M. The detail raw material proportion and the preparation method are disclosed in the specification. The invention has the following advantages: the coercive force of the offset magnetic sheet is as high as 800 KA / M to 1000 KA / M; in the unlocking process during repeated use of the acoustic-magnetic anti-theft label, the intense magnetic field of a magnetic force type unlocking device does not take effect on the magnetism of the offset magnetic sheet or destroy the alarming performance of the anti-theft label, thereby solving the problem that in the prior art the hard label can not be unlocked in a magnetic force mode. The offset magnetic sheet is used for the hard acoustic-magnetic anti-theft label or a lock catch type hard acoustic-magnetic anti-theft label to prevent the protected merchandise from being stolen.

Description

technical field [0001] The invention relates to an electronic article anti-theft system (EAS), in particular, the invention relates to a preparation method in an acousto-magnetic anti-theft hard tag. Background technique [0002] The electronic article anti-theft system is an electronic device widely used in supermarkets, shopping malls, libraries, and specialty stores to prevent retail goods from being lost. U.S. Patent No. 4,510,489 discloses a magnetic-mechanical electronic product anti-theft system and an acousto-magnetic anti-theft label. The bias magnetic sheet in the anti-theft tag in the prior art is made of metal semi-hard magnetic material or ferrite permanent magnetic material. The magnetic coercive force of the metal semi-hard magnetic material is small, and the activation and passivation of the acoustomagnetic label can be controlled by magnetizing or demagnetizing the bias magnetic sheet. This kind of acoustomagnetic label is called a soft label. The magneti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08G08B13/24
Inventor 张建国王志远
Owner GUANGZHOU QIDA MATERIAL & TECH
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