Unit and method for forming a layer of batches of groups of articles

A unit for forming a layer of at least one first batch and one second batch of respective first groups and second groups of articles, comprising:

• a first conveying line which may be fed with a first row of said first groups and which outputs, in use, said first batch separated from the remaining said first groups travelling parallel to a first direction, wherein said first conveying line comprises a first separating conveyor which separates, in use, said first batch from said remaining said first groups travelling, in use, in abutting relationship;
• at least one second conveying fine which may be fed with a second row of said second groups and which outputs, in use, said second batch separated from the remaining said second groups travelling parallel to said first direction, wherein said second conveying line comprises a second separating conveyor which separates, in use, said second batch from said remaining said second groups travelling, in use, in abutting relationship;
• and
• control means configured for receiving a signal associated to a misalignment between said first batch and second batch along a second direction transversal to said first direction, and for generating a first modified speed profile for said first separating conveyor of said first conveying line and/or a second modified speed profile for said second separating conveyor of said second conveying line, so as to recover said misalignment.