The purpose of this study was to analyse the characteristics and the problems of commercial zippers such as polyester coil zippers, plastic zippers and brass zippers by testing their properties. The sizes of the samples used for this were $\sharp$3, $\sharp$5 and $\sharp$8($\sharp$7 only in case of brass zippers), and all of them were selected in the same lot and collected from 4 different domestic companies. Original samples and another samples laundered 1, 3, 5 and 10 times were measured in terms of colorfastness, durability of coating of zipper, longitudinal dimensional change, operability of zipper, strength of zipper chain crosswise, and reciprocating movement of zipper. In conclusion, the properties of the zippers were revealed differently according to their kinds. Therefore, it was recommended that the present test standard should be modified, in order to improve them in quality.
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