Sleeve wrapper with Shrink tunnel Sleeve wrapper with Shrink tunnel are used to pack heavy products. The film used in this application is LDPE or LLDPE shrink film . In this machine , two rolls of film are used and automation un-winding system is a special type of knife sealer, which seals and cuts the film with uniformity and consistently. Air cooling is used for cooling the seal . Sleeve wrappers are usually combined with heavy duty shrink tunnels for better ourtput and packaging results.