Toothbrush and the process for its manufacture

A - Human Necessities – 46 – D

Patent

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A46D 1/00 (2006.01) D01D 5/253 (2006.01)

Patent

CA 2231532

A toothbrush comprising a brush head and plastic bristles, possibly in bundles, which are fitted thereto, the lateral faces of some of which bristles at least carry a profile. In order to obtain an increased brushing and massage effect without changing the resistance of the bristles, they are given a spiral profile. The bristles can comprise a core and at least one spiral running up the lateral faces. To make such a toothbrush, a profiled single thread or a thread with grooves running parallel to its axis can be extruded and then twisted, the twist then being fixed. It is also possible to co- extrude a single plastic thread with ribs of some plastic material having different properties running along its lateral faces and then to twist the bonded plastics and fix the twist.

L'invention concerne une brosse à dents possédant une tête sur laquelle sont fixées de poils en matière plastique éventuellement regroupés en faisceaux. Au moins certains poils ont une surface latérale profilée. Afin d'obtenir des poils présentant des effets de nettoyage et de massage améliorés avec des propriétés de résistance inchangées, on a doté les poils d'un profil en forme de spirale. Les poils peuvent être constitués d'une âme et d'au moins une spirale s'étendant sur toute leur surface latérale. Pour fabriquer la brosse à dents, on peut extruder un monofil profilé ou un monofil doté de nervures parallèles à l'axe que l'on torsade puis on fixe la torsade ainsi obtenue. Il est également possible de coextruder un monofil en matière plastique avec des nervures s'étendant sur la surface latérale, ces nervures étant réalisées dans une matière plastique ayant des propriétés différentes. Ensuite, on torsade le corps composite coextrudé et on fixe la torsade ainsi obtenue.

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