Method for producing a reinforcing bar

A method for producing a reinforcing bar, comprising:

• immersing and passing reinforcing fibers in a non-flat bundle form through a storage tank containing a molten thermoplastic polymer;
• while still immersed in the storage tank, spreading the reinforcing fibers such that the reinforcing fibers are arrayed in flatter state to cause the molten thermoplastic polymer to further impregnate between, and coat, the reinforcing fibers;
• converging the flattened reinforcing fibers impregnated with the molten thermoplastic polymer into a non-flat bundle form again to form a not yet cooled primary bar;
• and
• covering an entire outer periphery and longitudinal length of the not yet cooled primary bar with a covering layer made of an additional thermoplastic polymer to form the reinforcing bar by applying a predetermined squeezing force to the covering layer such that an inner periphery of the covering layer fuses with the outer periphery of the not yet cooled primary bar and causes an overall transverse cross section of the reinforcing bar to become more circular.