Method and apparatus for applying controlled heat to a group of articlesdisposed within a shrink film wrapper

Abstract From the Canadian patent

For applying heat to groups of articles disposed within a wrapper of shrink film whose ends are overlapped and disposed below the articles a tunnel is, provided including a conveyor through the tunnel having air passages therethrough and on which the groups of articles are disposed while being moved through the tunnel, a heater disposed below the conveyor a primary, fan for driving air through the heater and into a conduit which directs heated air through the passages in the conveyor and directly to the overlapped ends of the wrapper together with a fan and conduit for directing heated air at a lower temperature to the ends and sides of the groups of articles.