| 摘要 |
Each half of a slide fastener having two halves adapted to be sewn onto a carrier ribbon has a plastic thread formed into a series of helical loops defining convolution portions. Each convolution portion is flattened only in a limited region of each loop that overlaps a loop in the other half of the slide fastener and to a width substantially twice the diameter of the thread. These flattened regions form coupling surfaces which serve to inter-engage with the coupling surfaces formed in the other half of the slide fastener. The flattened regions are sharply kinked and the convolution portions adjacent the flattened regions only are disposed in superposed relation contacting each other and merged opposite to the flattened surfaces into oppositely directed, exposed, smooth return bend portions.
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