Reading about the strong force and the residual strong force I'm a bit confused about the interaction. Largely it keeps mentioning it the result of particle exchange and mentions that it has infinite distance, but that the residual strong force doesn't have infinite distance. However, it doesn't really explain that well. Why is that? Is the residual strong force something like Van der Waals effects within hadrons? Also if it is a particle interaction does that mean it occurs only between two particles at once in a highly dynamic manner (switching between all those around it)? Or is the residual strong force a field force like EM or gravity? Just much steeper cutoff. Also any good particle physics books?