Shrink labeling products is a mass-production proposition, but its complexity is only growing with increasingly diverse products in convenience, travel, and wholesale-club formats.
Shrink wrap machines
- Straight bar sealers are commonly used by video and music stores to wrap DVDs, CDs, and videotapes to cut the film around the product. L-bar sealers use an L-shaped bar to cut film around a product in one pass. These are also called impulse sealers because they use electricity rather than heat to cut film. These do not give off smoke like straight bar sealers.
- Sometimes, wire cuts through shrink-wrap film. The drawback is that it gets dirty and wears over time, and needs occasional replacement.
- Heat guns resemble hair dryers; heat tunnels utilize a conveyor to pull product through a heated area. Finished labels are more evenly shrunk.
- Shrink wrap sealers are designed for sealing thermoplastic films and bags such as polyethylene and polypropylene.
- To seal, vacuum sealers remove air from packages which are then moved into a shrink tunnel where the excess wrap is shrunk further.
- Sleeve wrappers are designed to wrap a wide variety of packages either individually, in short or long packs, or collated packs in trays. Band sealers allow continuous sealing of bags; they're suitable for packaging bags of spillable powders, liquids, and grains.