Why do we need to design work cards lanyard and certificate lanyard ? It has been seen that all the hanging belts and lanyard are anti twist. Make the Mobius rings. Is there any reason or meaning for this?
This involves a very complicated reason, that is, the work card lanyard is not a stable state, once subjected to external forces will be out of the original state you set right, and you have been moving, so inadvertently will twist.
The solution is to take pictures on all sides, so that no matter which side is correct, if not always pay attention to avoid important occasions work cards or twist.