Waterproof fastener stringer and method of producing the same

A method of producing a waterproof fastener stringer, the method comprising:

• forming through-holes at a constant pitch along a side-edge portion of a fastener tape where a tape base fabric is covered by a waterproof layer, the through-holes piercing the fastener tape;
• applying a plasma treatment to the side-edge portion of the fastener tape so as to form an activation region on a surface of the waterproof layer on one or both sides of the fastener tape;
• and
• performing an injection molding of fastener elements to attach the fastener elements to the side-edge portion of the fastener tape, a melted resin adhering to the activation region and filling the through-hole before solidifying into the fastener element,
• the method further comprising:
• applying a plasma treatment to the tape base fabric before the tape base fabric is covered by the waterproof layer.