Nv Bekaert Sa

Luc Sabbe

Frans Van Giel

Luc Bourgois

Stijn Vanneste

Xavier De Vos

Rik Mullebrouck

Johan De Waegenaere

A spool filled with two or more elongated elements such as steel cords wound in parallel and in several windings upon the spool. The distances between two neighboring elongated elements, as measured along a line parallel to the axis of the spool, is not more than 10 mm along 90% of the length of each elongated element.

Spool filled with multiple elongated elements wound closely together

A steel cord comprises steel filaments twisted around each other in a first direction about at least one steel core filament having a wave form. The twisted filaments are individually subjected to a rotation about their own axes. This steel cord is formed by deforming the core filament into a planar wave form and twisting the core filament in a second direction to a predetermined degree. The core filaments together with the other filaments are twisted in the first direction so that the twisted filaments are individually subjected to a rotation around their own axes in the first direction.

Twisting steel cord with wavy filament

A steel cord, having steel filaments twisted so as to have a final twist pitch, is manufactured by plastically deforming the steel filaments by overtwisting the steel cord to a twist pitch which is smaller than the final twist pitch, untwisting the steel cord to the final twist pitch, further untwisting the steel cord to a twist pitch which is greater than the final twist pitch, and twisting the steel cord again to the final twist pitch. The first two steps (i.e., overtwisting and untwisting) are done under a first tension and the third and fourth steps (i.e., further untwisting and twisting) are done under a second tension which is lower than half of the first tension.

Method and device for overtwisting and undertwisting a steel cord

A process and machine for making a cord in a structure of one or more layers of filaments, all twisted with a same twist pitch p around a core in which the filaments are not twisted around each other with that same twist pitch p. The cord is made in one continous process in which the core filaments are bundled in a twister, then the layer filaments are joined in parallel to the core bundle on exit from the twister, and the whole is then twisted in a double-twist bunching machine.

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Deerlijk, Belgium

Luc Sabbe