a method for pressing together empty containers , especially drinks bottles or cans made of plastic , especially pet or tinplate , comprises a housing with a fill opening and an outlet , a cutting and pressing disposed in the housing , and a device for driving and controlling the cutting and pressing unit . the cutting and pressing unit contains at least two rollers whose axes of rotation are arranged at a distance from each other . each roller has at least two sections . adjacent sections along the same roller have different diameters . when the rollers are mounted , the sections having the larger diameter are offset relative to each other and the peripheral surfaces thereof partially overlap with each other , forming cutting disks whose peripheral surfaces have at least one groove .