A heated roll laminator uses heated rollers to melt glue extruded onto lamination film. A pouch laminator uses a lamination pouch that is usually sealed on one side. For continuous, large-volume lamination projects, a roll laminator performs more efficiently. A carrier holds the pouch as it is run through the laminator. William J. Barrow developed the first practical roller-type laminator. The first four 32 foot hulls were manufactured by a spray gun laminator.