The tunnel S55 and S85, has been improved with some new technical details useful to satisfy all the packaging needs and can work with several shrink film. The tunnel S55DC and S85DC has been designed to pack fast the small products with optimum technical and esthetic results. Thanks to the double shrinking chamber, double shrinking adjustment, good thermal insulation, high speed conveyor, optimum air flow control this machine is a very good and efficient packaging solution.