Flexible magnetization energy transfer ribbons and process for producing them

A flexible energy-transfer ribbon, that includes a magnetized tape (3) composed of an elastomer material forming a matrix in which are embedded particles that impart to it a permanent magnetism oriented in the direction of the thickness of the said tape, at least one energy-transfer device (2) lying along the magnetized tape, and a coating material (1) in which the (or each) energy-transfer device is embedded and which adheres to the magnetized tape, characterised in that the magnetized tape is a continuous magnetized tape (3) in which are formed points of weakness (E) spaced at distances such that dimensional change phenomena induced in the magnetized tape, in particular under the effect of temperature differences, induce stresses between the magnetized tape and the coating material that are sufficiently strong to provoke the separation of the magnetized tape at the location of the said points of weakness and the formation of sections of tape (31), but which are sufficiently small to prevent weakening of the adhesion between the said magnetized tape and the said coating material.

A process for the manufacture of a flexible energy-transfer ribbon, characterised in that it includes the following stages:

• provision of a continuous magnetized tape (3) composed of an elastomer material forming a matrix in which are embedded particles that impart to it a permanent magnetism oriented in the direction of the thickness of the said tape,
• fixing along the said tape of at least one energy-transfer device (2) by means of a coating material (1) in which the (or each) energy-transfer device is embedded and which adheres to the magnetized tape,
• creation in the said magnetized tape of notches (E) forming points of weakness spaced at distances such that dimensional change phenomena induced in the magnetized tape, in particular under the effect of temperature differences, induce stresses between the magnetized tape and the coating material that are sufficiently strong to provoke the rupture of the tape at the location of the said points of weakness and to form sections of tape (31), but which are sufficiently small to prevent weakening of the adhesion between the said magnetized tape and the said coating material.