Shrink wrapping is a particularly well-established form of packaging that has developed over the past four to five decades.

Essentially, material is produced such that molecules are stretched as part of the manufacturing process. When this material is subjected to heat, the elastic memory of the plastic is activated, causing the material to shrink around the product.

This is a traditional division between packaging for transit and packaging for display, whilst the latter has a further division into food and non-food applications.

The key to the application of shrink wrap for transit is cost so that the material and its application provide the lowest cost solution in deelivering the product from the manufacturer to the end user.

The conventional definition of a transit wrap involves the use of a sleeve sealer and polyethylene film. An individual or bundled wrap provides the necessary solution of achieving the shipment at the lowest cost.

A typical wrap offers two open sides as a consequence of the use of a sleeve although in certain applications the sleeve may be effectively eliminated by the use of appropriate machinery. Generally, the latter is not a particular requirement.

Polyethylene has the attributes of strength at a certain thickness together with shrink ratios and slip. Accordingly, a user will be able to specify a thickness to provide the necessary pack integrity to the end user and shrink ratios to ensure that the wrap is tight. Slip can be altered to ensure that packs stack appropriately.