an automatic high speed packaging machine for wrapping packages in polymer film is disclosed wherein the film seal at the sides and ends of the packages is made at a high rate of speed as the packages travel through the machine . the packages travel continuously in a straight line through the machine . the packages are delivered at the input end of the machine by an in - feed conveyor into a film inverting head where the packages are surrounded by longitudinally half - folded polymer film . thereafter , the packages are transported to a side sealing mechanism which forms a longitudinal seal in the film on the side opposite the fold . finally , the packages are transported to a traveling end seal mechanism where a lateral seal is formed at each end of the package and the film web connecting succeeding packages is severed . the machine produces packages which have a sealed film wrap around the entire package . if desired , the polymer film may be of a heat shrinkable variety and the sealed package may be passed through a shrinking oven to produce a package having a tight “ shrinkwrap ” film covering .