Waterproof slide fastener and apparatus for manufacturing the same

A waterproof slide fastener comprising:

• a pair of fastener stringers having a plurality of fastener elements aligned along each of opposing element mounting edge portions of a pair of waterproof fastener tapes including a waterproof layer comprising elastomer resin on a belt-like core material obtained by any one of weaving and knitting;
• and
• a slider for engaging and disengaging the fastener elements;
• wherein
• each fastener element is formed of a synthetic resin material and has a coupling head, a neck portion, a body portion and right and left shoulder portions extending from the neck portion to the body portion and expanding in right and left directions in a wing-like shape,
• the coupling head, the neck portion, the body portion and the shoulder portions are composed of upper and lower half portions formed integrally on front and rear faces of the fastener tapes, each of the upper and lower half portions being integrated with each other by a connecting portion through a through hole formed in the element mounting edge portion,
• a terminal end of the element mounting edge portion extends beyond the neck portion such that the end faces of the opposing fastener tapes come into a pressure contact with each other when fastener element rows are engaged, and there is formed a gap between the upper and lower half portions of the coupling head,
• each half portion of the coupling head and the shoulder portions is formed thinner than each half portion of the neck portion and the body portion in a direction perpendicular to a plane in which each of the fastener tapes lies, and
• an entire shoulder width of the right and left shoulder portions including the neck portion is set larger than a body width of the body portion.