They are available with front- or side-infeed systems; single dual or triple ovens; and custom options to accommodate most lines. These new models reduce film usage per package with their ability to "fine-tune" bag size on-line. A self-centering seal bar system reduces downtime by using equal amounts of film from both webs allowing replacement at the same time. Fast-loading two-station film cradles help expedite film replenishing. Variable-speed conveyors and circulation fans allow maximum film shrinkage.