Method and device for orienting magnetisable particles in a...

B - Operations – Transporting – 28 – B

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B28B 1/52 (2006.01)

Patent

CA 2526705

The invention relates to a method and device for orienting magnetisable particles (4) in a kneadable material (3), in particular steel fibres or rings in unhardened concrete by means of an orienting body (1) provided with a non- magnetic wall comprising a front face section (1a) and a rear face section (1b). A kneadable material (33) and the front face section (1a) of the orientation body (1) are first and foremost displaced with respect to each other. The orientation body (1) is also provided with a magnetic unit (2) which is disposed on the internal side of said front face section (1a) and generates a periodically variable magnetic field acting on the kneadable material in order to orient the magnetisable particles (4). Said invention is characterised in that said magnetic field is divided into at least two areas (I II) containing the partial fields exhibiting different forces and/ or different directions of force lines. The partial field of the first area (I) applies long trajectory orientation and attractive forces on the particles, the partial field of the second area (II) releasing orientedly positioned particles.

L'invention concerne un procédé et un dispositif pour orienter des particules (4) magnétisables dans une matière (3) pâteuse, notamment des fibres ou des anneaux d'acier dans du béton non pris, au moyen d'un élément d'orientation (1) doté d'une paroi non magnétique comportant une section face avant (1a) et une section face arrière (1b). La matière pâteuse (33) et la section face avant (1a) de l'élément d'orientation (1) sont d'abord déplacées l'une relativement à l'autre. L'élément d'orientation (1) est en outre pourvu d'une unité magnétique (2), disposée sur le côté interne de la section face avant (1a), cette unité magnétique générant un champ magnétique à variation périodique, lequel agit sur la matière pâteuse pour orienter les particules (4) magnétisables. L'invention est caractérisée en ce que le champ magnétique est divisé en au moins deux zones (I, II) comportant des champs partiels de différentes forces et/ou de différentes lignes de champs, le champ partiel de la première zone (I) exerçant sur les particules une force d'attraction et d'orientation à longue trajectoire et le champ partiel de la deuxième zone (II) libérant les particules en position orientée.

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