High density plunger movement

An agricultural baler comprising:

• a baling chamber;
• and
• a pre-compression chamber configured to gather crop material and to periodically form a slice of the crop material and introduce the slice towards the baling chamber into a first segment of the baling chamber,
• wherein the baling chamber comprises:
• a plunger provided for reciprocally moving in the baling chamber, the reciprocal movement having a power movement and a retraction movement, wherein in use, during the power movement, slices of the crop material are compressed into a bale and the bale is pushed through the baling chamber;
• at least one movable wall for exercising a compression force to the crop material in a direction substantially transverse to the propelling movement so that, in use, the at least one movable wall provides a counter pressure for the propelling through the baling chamber of the bale;
• and
• a controller configured to influence the compression force at a predetermined moment of the power movement to reduce the counter pressure, wherein the predetermined moment is related to the moment where the power movement initiates the propelling through the baling chamber of the bale.