Three twisting methods of barbed wire: positive twist, reverse twist, forward and reverse twist.
Positive twisting method: Twist two or more iron wires into a double-strand wire rope and then wind the barbed wire around the double-strand wire.
Reverse twisting method: Firstly, the barbed wire is wound on the main wire (that is, a single iron wire), and then an iron wire is twisted and woven with it to form a double-strand barbed wire.
Positive and reverse twisting method: It is to twist and weave in the opposite direction from the place where the barbed wire is wound around the main wire. It's not twisted in one direction.