L-Sealer Shrink Wrapping Machines create poly bags of heat sensitive shrink film around your product. An attached Shrink Tunnel then applies heat to the bag, shrinking and tightening the film. L-Sealing Shrink Wrappers are available in both automatic and semi-automatic formats.An L-sealer is a piece of packaging equipment designed to enclose a product with shrink film. Commonly, an L-sealer consists of an adjustable product tray where the product is placed and the top layer of center folded film covers the product.A shrink wrap machine dispenses film which is loosely folded over a product. The film is then heated and forms a tight wrap around the product. The range of equipment available starts with a set-up of manually-fed film used with a hand-held heat gun.