Thermal plastic elastomer injection mold, water impervious slide fastener manufactured utilizing the same and finished product having the water impervious slide fastener

An injection mold, comprising:

• a mold base, formed with a slide fastener supporting platform having a top surface thereof formed with an arc-shaped surface, wherein said arc-shaped surface supports a pair of support-tapes of a slide fastener and is formed with a transversally elongated arc-shaped ridge thereon, two ends of said arc-shaped ridge are respectively formed with a front end and a rear end, and said front end is formed with a wedge-shaped tip capable of being inserted into a gap formed between said pair of support-tapes, thereby allowing said gap to be transversally displaced with said arc-shaped ridge, and a surface of said arc-shaped ridge is longitudinally formed with a injection port connected to at least one extruder;
• and
• a thermal plastic elastomer, extruded out from said at least one extruder and passing said injection port so as to be injected into said gap and into slits inside two rows of coupling elements disposed at inner edges of said pair of support-tapes, wherein said slide fastener is formed with a water impervious structure after said thermal plastic elastomer inside said gap is cut.