Closure device

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 33/25 (2006.01)

Patent

CA 2381055

The closure device includes interlocking first and second fastening strips. The first fastening strip includes a closure element extruded onto a flange portion. The closure element and the flange portion are composed of materials having different densities to control the shape of the fastening strips. The purpose of changing the densities of the material is to reduce or eliminate the curve in the fastening strips which occurs during the manufacturing process. By providing a lower density material for the closure element, which has a greater volume, and by providing a higher density material for the flange portion, the flange portion will crystallize at the same rate as the closure element. This difference in densities results in a reduction or elimination in the curvature of the fastening strips.

Cette invention concerne un dispositif de fermeture comprenant une première et une seconde bandes de fixation encastrables. La première bande de fixation comporte un élément de fermeture réalisé par extrusion sur une partie rebord. L'élément de fermeture et la partie rebord sont faits de matériaux de densités différentes, ce qui permet d'agir sur la forme des bandes de fixation. Ce différentiel de densité permettent d'atténuer ou de supprimer l'effet de cintrage des bandes de fixation qui apparaît pendant le processus de fabrication. Comme l'élément de fermeture a une moindre densité, mais un volume plus important, et que la partie rebord est faite dans un matériau à la densité plus élevée, le taux de cristallisation de cette partie est le même que celui de l'élément de fermeture. Cette différence de densité permet d'atténuer ou d'éliminer le cintrage des bandes de fixation.

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