Flat bottom resin zipper

A flat bottom resin zipper comprising two zipper tapes, each said zipper tape comprising a chain cloth, a chain tooth bar and a plurality of sewing threads, wherein:

• said chain tooth bar is pre-injection molded on an inner side of said chain cloth with a plurality of resin chain teeth, each said resin chain tooth comprising a rectangular block, a cloth groove recessed laterally from one end of said rectangular block toward an opposite end of said rectangular block, a chain tooth head formed at one end of said rectangular block, a sewing thread slot recessed from a top of said rectangular block to a bottom of said rectangular block and a chain cloth embedding groove recessed from the bottom of said rectangular block toward the top of said rectangular block, said sewing thread slot and said chain cloth embedding groove respectively extending to two opposite sides of said rectangular block;
• when said resin chain teeth are injection molded, an inner side of said chain cloth is clamped in said cloth groove of each said resin chain tooth, so that said resin chain teeth are arranged at intervals on the inner side of said chain cloth;
• said sewing threads are wound in said sewing thread slot and said chain cloth embedding groove of each said resin chain tooth, and said sewing threads are sewn to said chain cloth at the gap between each two adjacent said resin chain teeth;
• and
• an inner side of said chain cloth is folded toward an outer side of said chain cloth to form a chain tooth belt and a sliding space between said chain tooth belt and said chain cloth, said chain tooth bar being located on the side of said chain tooth belt opposite said sliding space to hide said resin chain teeth on one side of said chain cloth.