Slide fastener and method for manufacturing slide fastener

A method for manufacturing a slide fastener which comprises:

• a pair of fastener tapes;
• a pair of fastener element rows respectively sewn to opposing tape side edge portions of the pair of fastener tapes with sewing threads, each of the fastener element rows having a plurality of fastener elements;
• a pair of core strings which are inserted into the pair of fastener element rows, respectively;
• and
• a slider configured to engage and disengage the pair of fastener element rows,
• wherein the slider includes a pull tab which is arranged at a side of the pair of fastener tapes opposite a side of the pair of fastener tapes with the fastener element rows,
• the method comprising:
• supplying the pair of fastener tapes to a sewing machine;
• supplying the pair of fastener element rows that are engaged with each other to the sewing machine;
• setting, at the sewing machine, a gap between the pair of fastener tapes to a predetermined width dimension;
• and
• sewing, at the sewing machine, the pair of fastener element rows to the tape side edge portions of the pair of fastener tapes, respectively, with the sewing threads, wherein a first sewing thread of the sewing threads contacts a first one of the pair of fastener element rows and a second sewing thread of the sewing threads contacts a second one of the pair of fastener element rows;
• wherein the predetermined width dimension of the gap between the pair of fastener tapes when the pair of fastener element rows are engaged with each other is set to be 10 to 25% of a width dimension of the pair of fastener element rows that are engaged with each other,
• wherein the pair of fastener tapes and the pair of fastener element rows are colored in different colors, and
• wherein the sewing threads for respectively sewing the pair of fastener element rows to the opposing tape side edge portions of the pair of fastener tapes penetrate through the core strings inserted into the pair of fastener element rows, respectively.

A slide fastener comprising:

• a pair of fastener tapes;
• a pair of fastener element rows respectively sewn to opposing tape side edge portions of the pair of fastener tapes with sewing threads, each of the fastener element rows having a plurality of fastener elements;
• a pair of core strings which are inserted into the pair of fastener element rows, respectively;
• the sewing threads, wherein a first sewing thread of the sewing threads contacts a first one of the pair of fastener element rows and a second sewing thread of the sewing threads contacts a second one of the pair of fastener element rows;
• and
• a slider configured to engage and disengage the pair of fastener element rows,
• wherein the slider includes a pull tab which is arranged at a side of the pair of fastener tapes opposite a side of the pair of fastener tapes with the fastener element rows,
• wherein the pair of fastener tapes and the pair of fastener element rows are colored in different colors,
• wherein when the pair of fastener element rows are engaged with each other, a gap is formed between the pair of fastener tapes, and
• wherein the color of the fastener element rows is visible through the gap from the side of the pair of fastener tapes with the pull tab, and
• wherein the sewing threads for respectively sewing the pair of fastener element rows to the opposing tape side edge portions of the pair of fastener tapes penetrate through the core strings inserted into the pair of fastener element rows, respectively.