The apparatus for forming a container is situated in a container-forming unit comprising different processing stations. The apparatus for forming a container includes a wrapping mandrel attached to a moving structure, which is arranged to move the wrapping mandrel between different processing stations, and the members for feeding the blank to the wrapping mandrel. The apparatus for forming the container also has members to wrap the blank around the wrapping mandrel in order to form a structure that is closed in the horizontal cross-section perpendicular to the longitudinal axis. The wrapping mandrel is equipped with suction openings distributed on its perimeter, which openings are connected to the air duct in order to wrap the blank around the wrapping mandrel with the aid of suction.
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