Flat box blanks are set up into boxes by feeding a succession of the blanks one at a time to a setup station and gripping the blanks and pulling them one after another by grippers in a direction without stopping through the station. A plurality of setup tools are moved through the station in the direction synchronously with the grippers and the blanks and are engaged with the continuously moving setup tools transversely with the blanks in the setup station to shape the blanks into boxes while the blanks are held out of contact in the station with any structure other than the synchronously moving tools and grippers.

A shrink tunnel assembly for wrapping an article with polymeric shrink film includes a shrink tunnel having a heating zone, and conveyor means for carrying an article to the heating zone and away from it. While in the heating zone, polymeric shrink film covering an article avoids contacting any solid surface, thereby protecting the article from marring and destruction.

A packaging machine using a heat-shrinkable film comprises a frame (14, 16) for peripheral sealing of a film (19) segment and a tunnel (21) disposed alongside the frame, in which means (27) for air circulation is arranged, which air is heated by electrical heating elements (28) for shrinkage of the sealed film which is introduced into the tunnel. The machine comprises means (34) for detecting a condition associable with the presence in the machine of a product wrapped in a film to be shrunk. This detecting means (34) upon detection of said condition produces a signal (33) for temporary actuation of the hot-air circulation means (27).

A shrink packaging machine for shrink wrapping an article with shrink film includes: a hot air chamber; a conveyor operable to transport the article covered by shrink film at least partially through the hot air chamber; a first roller disposed over the conveyor and configured to engage the article transported on the conveyor; and a plurality of additional rollers disposed over the conveyor. Each of the plurality of additional rollers is vertically displaceable relative to the conveyor independent of displacement of the other of the plurality of additional rollers. Furthermore, when each of the plurality of additional rollers is in a respective lowermost position relative to the conveyor, an axis of rotation of the first roller is disposed at a height from the conveyor that is greater than a respective height from the conveyor at which each axis of rotation of each of the plurality of additional rollers is disposed.

A method for accommodating a greater height variance of articles in a shrink packaging machine includes: transporting on a conveyor into a hot air chamber an article covered in shrink film and engaging the article being transported on the conveyor with a first roller and a subsequent second roller. The article is engaged with the first roller at a first initial vertical height from the conveyor that is less than the initial vertical height of an axis of rotation of the first roller from the conveyor. The article is engaged with the second roller at a second initial vertical height from the conveyor that is less than the initial vertical height of an axis of rotation of the second roller from the conveyor, which in turn is less than the initial vertical height of the axis of rotation of the first roller from the conveyor.