Patent ID: 6020074
Filing Date: 2000-02-01
Classification: G08B,Y10S,Y10T

Abstract:
A process yielding a composite sheet component of a system for protecting against theft of articles which comprises depositing at least one thread or tape made of magnetic material having a high permeability on a first sheet, said first sheet being joined to a second sheet with the thread or tape sandwiched between them forming said composite sheet, said composite sheet thus furnished with the thread or tape being wound up into a reel, wherein the thread or tape is placed on said first sheet along a line which is sinuous or zigzagged with respect to the longitudinal direction of said first sheet in which the sinuosity is characterized by a pitch and an amplitude, the pitch and the amplitude of the sinuosity being chosen so that, in the reel formed with a plurality of turns of said composite sheet, in one and the same plane passing through the axis of the reel, the thread or tape sections lying in adjacent turns of the reel and in one and the same plane passing through the axis of the reel are offset transversely.