Method for manufacturing a watertight zipper

A method for manufacturing a watertight zipper, comprising:

• forming a waterproof tape by extruding a polymeric material in a melted state wrapping around an outer surface of a cloth tape, wherein the waterproof tape comprises a thick waterproof layer and a thin waterproof layer both formed by the polymeric material in a solidified state, wherein the thick waterproof layer has a thickness greater than a thickness of the thin waterproof layer, wherein the thick waterproof layer covers an upper surface, a lower surface, and an edge extending between the upper and lower surfaces of the cloth tape, and wherein the thin waterproof layer integrally connects with the thick waterproof layer and extends therefrom away from the edge of the cloth tape;
• cutting a side of the thick waterproof layer at the edge of the cloth tape by laser to form a side surface of the thick waterproof layer in a plane form as an abutting surface;
• forming a plurality of apertures at the waterproof tape, wherein each of the plurality of apertures extends through the upper and lower surfaces of the cloth tape and the thick waterproof layer;
• and
• forming a plurality of scoops at the edge of the cloth tape where the thick waterproof layer is formed, wherein the plurality of scoops corresponds to the plurality of apertures by injection molding, wherein each of the plurality of scoops is spaced from the thin waterproof layer, and wherein an end of each of the plurality of scoops extends beyond the abutting surface of the thick waterproof layer.