Novel antitheft tag magnetic material, production process thereof and acoustic magnetic antitheft tag

Abstract

The invention relates to a novel antitheft tag magnetic material and a production process of the novel antitheft tag magnetic material, wherein the producing process comprises the steps of: adopting a cold-rolled steel plate and hot-rolling the cold-rolled steel plate to the thickness of 1+ / -0.2 mm; coating heat treatment protective paint which is 0.5+ / -0.05 mm in thickness and contains 1% of Nb on the surface of the hot-rolled steel plate; carrying out heat treatment on the hot-rolled steel plate which is coated with the heat treatment protective paint at the temperature of 850-900 DEG C; carrying out heat treatment at the temperature of 700-750 DEG C; and cooling. The invention also relates to an acoustic magnetic antitheft tag; a magnetic biasing piece is made from the novel antitheft tag magnetic material; and a resonant sheet is made from a microcrystal soft magnetic material. In the invention, stainless steel materials which are low in cost and can be produced in batch by stainless steel manufacture factories are taken as raw materials, so that the defect that the existing semi-hard magnetic materials are less in manufacture factory, long in ordering cycle and high in cost is solved; and as the novel antitheft tag magnetic material is a magnetic material with high coercive force and low residual magnetism, the structural design of the acoustic magnetic antitheft tag is simplified, and the manufacturing cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of commercial anti-theft labels, in particular to a novel magnetic material for anti-theft labels, a production process thereof, and an acoustomagnetic anti-theft label. Background technique [0002] Acoustomagnetic technology has been widely used in electronic object monitoring and anti-theft devices for more than 20 years. The US patent US4510489, which records the original invention, discloses that certain amorphous alloy material thin strips can emit light due to their high magnetic-elastic coupling coefficient. Strong resonance signals, and using this principle to successfully apply these materials to commercial anti-theft systems (acousto-magnetic systems), such as anti-theft systems in large supermarkets. The acousto-magnetic system mainly includes a detector, a decoder and a checker, and an anti-theft acousto-magnetic target. The detector widely used commercially is the Ultramax detector manufactured...

AI Technical Summary

Problems solved by technology

Especially the semi-hard magnetic bias sheet must be fixed outside the cavity, and the thin sheet is accurately positioned and then sealed multiple times, which makes the manufacturing process complicated

This not only increases the difficulty of sheet processing, but also the uneven resonant sheet is easy to change the resonance frequency due to slight pressure

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