Why is twisted copper and cotton silk loose?

The tension on the storage wheel is unstable. There are many places where air pressure is used in the production workshop, which will cause the air pressure of the air pump of the wire drawing machine to be high and low, which also makes the tension of the wire storage device not constant, and because the speed of taking up the wire is constant, this makes the wire drawing The tensile force is also not constant, which may cause the outer diameter deviation of the single wire to be unable to be accurately controlled.