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1. An apparatus for capping containers comprises: at least one capping head configured to move between a first position for picking up a cap and a second position for applying said cap at a neck of a container, said at least one capping head defining a grip element which is open on a side intended to be directed toward the container to be capped, said grip element defining a receptacle for said cap and means for removable retention of said cap within said receptacle, said grip element being functionally associated with first motor means which are designed to screw the cap accommodated in the respective receptacle onto the neck of said container, and further comprising second motor means which are adapted to actuate a movement of said grip element in an axial direction, a control and actuation unit being provided which is functionally connected to said first motor means and to said second motor means and is configured to receive in input a plurality of data items which comprises: a first data item comprising the angular position of said receptacle, a second data item relating to an axial position of the receptacle, a third data item relating to an axial stress force applied to said receptacle, and a fourth data item relating to a rotational torque to which said receptacle is subjected, said control and actuation unit being configured to actuate said first motor means and said second motor means as a function of a variation of a value over time of said plurality of data items.
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