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Cling film

Cling film
Issue Time:2013-04-04
A roll of LDPE plastic wrap in a box. The lid of the box has a serrated edge for cutting the film.

Plastic wrap, cling film (UK), cling wrap or food wrap, is a thin plastic film typically used for sealing food items in containers to keep them fresh over a longer period of time. Plastic wrap, typically sold on rolls in boxes with a cutting edge, clings to many smooth surfaces and can thus remain tight over the opening of a container without adhesive or other devices. Common plastic wrap is roughly 0.5 mils, or 12.5 μm, thick. In Australia and New Zealand the genericized trademark glad wrap is commonly used, while Saran wrap has become genericized in North America.

Materials used

Plastic wrap was first created from PVC, which remains the most common material. Non-PVC alternatives are now being sold due to concerns about the transfer of plasticizers from PVC into food, although PVC is still the most common. For household use, LDPE is gaining market share as it is purportedly safer.

A number of governments are concerned about the environmental effect of PVC, as the material is said to be toxic and harder to recycle. Nevertheless, PVC is still used as its stretching properties offer excellent food catering presentation on the shelf, and it clings well to more kinds of surfaces. Even so, some countries are starting to ban the use of PVC in toys for infants and food contact applications.

The original Saran Wrap is made of polyvinylidene chloride (PVdC). In July 2004 the name Saran Original was changed to Saran Premium and the formulation was changed to low density polyethylene (LDPE). SC Johnson claimed that this change was a result of an initiative to look for more sustainable and environmentally acceptable plastic. The film in Saran Premium Wrap does not contain chlorine. However, LDPE does not possess the same barrier qualities to oxygen, aroma, and flavor molecules that vinylidene chloride copolymers do, making the new formulation a lower quality plastic wrap, as it is not as useful in protecting from spoilage or flavour loss.[citation needed] This is because PVdC has a significantly lower water vapor transmission rate (WVTR) than LDPE.[3]

The PVC-based films contain plasticizers, most often bis(2-ethylhexyl) adipate (DEHA), but phthalates (most often dibutyl phthalate (DBP) and bis(2-ethylhexyl) phthalate (DEHP)), in spite of being prohibited in most countries, also cause concern. The plasticizers were found to migrate to some foods, for example cheeses or fatty fish and meat. In the UK, polymerized plasticizers replaced DEHP in this application, largely eliminating the problem.[4]

A common alternative to PVC is low density polyethylene (LDPE), which is less adhesive than PVC, but does not contain traces of these potentially toxic additives. However, newer production processes are closing the adhesive gap between PVC and LDPE. Linear low density polyethylene (LLDPE) is sometimes added to the material, as it increases the adhesive qualities and the tensile strength of the film.[5] Brands like Saran Premium Wrap, Glad Cling Wrap and Handi-Wrap are LDPE-based.

Glad Press'n Seal has its surface covered by shaped dimples, which hold the adhesive away from the surface. While being handled, the wrap is unsticky, but when pressure is applied the dimples are flattened and the adhesive pushed against the contacting surface, sticking them together.[6] The adhesive used is a special edible type similar to chewing gum.[7]

PVdC has better barrier properties than the more-permeable LDPE, making the foods wrapped in it less subject to freezer burn.[citation needed] However, LDPE is substantially cheaper and easier to make.

Natural polymers of LDPE and PVdC are insufficiently adhesive on their own, and they do not adhere to themselves. To achieve the desired adhesiveness, certain polymers with lower molecular weight have to be added; the most common two are polyisobutene (PIB), and poly[ethylene-vinylacetate] (EVA) copolymer. Their chains readily interact with each other and their lower molecular weight makes them more mobile within the host polymer matrix.[8]