Hollow filament with crimp for use in spiral binding

Details Hollow filament with crimp for use in spiral binding Hollow filament with crimp for use in spiral binding

B - Operations, Transporting

42

D

B42D 1/00 (2006.01) B42B 5/12 (2006.01) D01D 5/24 (2006.01)

Patent

CA 2244488

Multiple sheets spiral bound together as a unit by a continuous filament. The sheets have a plurality of closely spaced perforations aligned along an edge thereof. The filament is an elongated rod-like member having an outer surface and a centrally-located longitudinal axis. The filament is flexible and is disposed in spiral configuration through the perforations. The filament additionally comprises an inner surface defined by an internal elongate passage extending therethrough. The internal opening facilitates crimping of the inventive filament after it has been spiraled into a plurality of closely spaced perforations aligned along an edge of a stack of sheets. The internal opening in the filament also provides improved control over the outer dimension of the filament during manufacture.

Feuilles multiples reliées en spirale par un filament en continu, formant une unité. Les feuilles comprennent de nombreuses perforations peu espacées et alignées sur un bord. Le filament est un élément allongé sous forme de tige ayant une surface extérieure et un axe longitudinal central. Il est flexible et traverse les perforations dans une configuration en spirale. Le filament comprend également une surface intérieure définie par un passage allongé interne se prolongeant sur la longueur. L'ouverture interne facilite l'aplatissement du filament après son trajet en spirale dans les nombreuses perforations d'une pile de feuilles. Elle assure également un meilleur contrôle sur la dimension extérieure du filament pendant la fabrication.

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