| 摘要 |
A slide fastener of the concealed or masked type comprises a pair of opposed support tapes each having a longitudinal edge portion folded on itself and rows of interlocking fastener elements secured to the folded edge portions of the respective support tapes. The tape is made of a warp-knit fabric having on one surface a multiplicity of alternate wales and interwale grooves. A particular wale disposed close to the path of a sewing needle is formed with fewer knit threads than the remaining portions of the tape to reduce the loop density thereat and hence renders this wale portion flexible to permit the tape to yield itself to the sewing pressure. |
