PVdC (Polyvinylidene Chloride) is a highly effective barrier coating polymer that is produced by the polymerisation of a vinylidene chloride monomer with other monomers such as acrylic esters and unsaturated carboxyl groups. It is the chemistry, density and symmetry of the molecules in PVdC that give the material its excellent barrier properties against fat, vapour and gases. This molecular structure results from the combination of salt (50-70%) and oil (30-50%).
PVdC’s outstanding barrier properties make it ideal for use in food packaging, and it is particularly effective for products with a high fat content and strong flavours and aromas. It is often used in the packaging of confectionary, dehydrated foods, dairy products, sausages, patés, meat, smoked fish, and dried products such as herbs, spices, tea and coffee.
The benefits of PVdC
PVdC is a favourite material among designers because it delivers tangible and distinctive solutions to packaging needs. These include:
- High levels of transparency offer the most attractive product presentation and display. In applications where light penetration can pose problems (medicines fro example), the PVdC film can be colour-toned to reduce exposure.
- Excellent barrier qualities extend the shelf life and conservation of foods, while at the same time reducing the need for preservatives, which in turn enhances the appeal of the product to the consumer.
- Outstanding heat sealing properties help materials such as paper, cellophane and other plastics to seal themselves effectively. This means that packaging can be easily and rapidly sealed during processing, so that high film speeds and throughputs can be achieved.
- Highly flexible characteristics allow the PVdC to perform across a very wide range of applications.