| 摘要 |
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.
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