Fluid-impervious slide fastener, manufacturing method thereof and product having same

A manufacturing method of a fluid-impervious slide fastener, including steps:

• preparing a pair of support tapes, wherein each of said support tapes has a top surface, a bottom surface and an inner side edge, and a bottom inner edge of each of said bottom surfaces is disposed with a plurality of continuous coupling elements arranged in a row manner;
• processing an extruding procedure of a high polymer elastomer member to a central slit between said pair of support tapes while said pair of support tapes being in a coupled status, thereby allowing a gap filling member to be formed in a plurality of adjacent gaps of said continuous coupling elements, wherein said gap filling member is longitudinally extended and adhered to a corresponding said bottom inner edge and a corresponding said inner side edge of said pair of support tapes, and a slit covering member is transversally formed on said plurality of continuous coupling elements;
• processing a cutting procedure to said slit covering member in said central slit for allowing said slit covering member to be formed as a left covering member and a right covering member, wherein said central slit has a width after said continuous coupling elements are coupled;
• said left covering member has a left cutting end surface, and said right covering member has a right cutting end surface;
• and disposing a waterproof layer on said top surface of said support tape at a left side and said left covering member, and disposing another waterproof layer on said top surface of said support tape at a right side and said right covering member, wherein a covering layer is extended from a lateral side of each of said waterproof layers to longitudinally cover at least one portion of said left cutting end surface and at least one portion of said right cutting end surface, and a first covering body having a first length is jointly defined by said left covering member and said covering layer, and a second covering body having a second length is jointly defined by said right covering member and said covering layer;
• when said plurality of continuous coupling elements are in a coupled status, a sum of said first length and said second length is greater than said width of said central slit, so that said first covering body and said second covering body are able to elastically abut against each other so as to form a tightening deformation, and a covering abutting member having a fluid-impervious function against a fluid is formed in said central slit.