The highest output speeds are offered by flow wrappers using side seal or overlap mechanisms. Nevertheless the common feature of a two dimensional bag remains the principal similarity between all these sealers.

Polyolefin films offer a variety of attributes so that a very large range of applications can be made.

In general, these are not found in food applications although once more, definitions continue to be stretched. Polyolefin is quite well used in certain applications notably pizza and egg wrapping as well as produce packaging. However, a more precise definition might be that polyolefin is not used to extend the shelf life of a food product. This applies generally except where shrink barrier film is used although this latter product is particularly specialised.

Normally, other materials than shrink are used to extend shelf life and as a consequence, shrink is found only in certain food applications although volumes can be significant.

Display applications for polyolefin have almost no limits as materials have been engineered to deal with any given requirement.

Soft shrink as well as perforation and printing are standard offers. At a more specialised level, slip and anti-fog treatments are also available.

There are a few notable ranges of polyolefin shrink film that offer better machineability and performance than the majority of the market and these are particularly distinguished by technical differentiation in manufacturing. These lead to irradiated grades which offer enhanced strength and multi-layer complexes that may be tailored to a particular requirement.

Polyolefin manufacture typically uses three or five layer extrusion and this confers performance benefits as a consequence.

It will be noted that the key to market movement is the development of material to address specific requirements, since its application is relatively uncomplicated.

There is no doubt that polyolefin shrink film will continue to develop so that it addresses even more uses than at present.

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