There are many types of wrappers:
Overwrappers are wrappers that fold the wrap tight to the product. These were pioneered by Package Machinery Company of Massachusetts and have been around since the middle Twentieth Century. There are various types of overwrappers:
Overwrappers are used less today than in previous years and they have been largely replaced by flow wrappers and shrink wrappers which are simpler, faster and cheaper. In cases where a tight wrap is not necessary, a flow can wrap an item for less money and shrink film can often create a tight enough wrap. In the 1970’s, Doboy Industries of Wisconsin (now owned by Bosch Packaging) developed the Mustang and wrapper which became the leading flow wrapper. The Doboy Scotty was developed for wrapping smaller items and the Super Mustang was developed for higher speed wrapping. A horizontal wrapper takes film off a role and folds it over into a tube. The product is inserted into the tube and a rotating heated bar seals the tube at each end, enclosing the product.
Another type of wrapper that was developed by Package Machinery is Cut and Twist wrapper for individual pieces of candy. The Package Machinery Model K wrapper, which was developed more than 100 years ago, is still widely used in small candy operations. However, flow wrappers have made inroads in this market as well.
Shrink wrapping has become popular in recent years because it can package just about anything easily and cheaply. Virtually every packaging plant has L-Bar sealers and shrink tunnels for shrink wrapping. L-Bar sealers can be semi-automatic or fully automatic. For speeds faster than an L-Bar sealer can produce, there are shrink wrappers that are similar to flow wrappers but have guillotine sealing knives for shrink film rather than rotary sealing bars.