Poly-Vinylidene Chloride (PVDC) is a water-based coating often used to improve barriers and reduce permeability. It keeps food fresh, improves shelf life, and gives packaging an attractive high-gloss finish; all qualities that are behind the packaging industry's preference for plastic. As a thermoplastic, PVDC is flexible, clear, and easily extruded. It clings well and resists oils and other chemicals, so it's often used in pharmaceutical packaging. It's easy to laminate, and if you need a more budget-friendly option, it can be mixed with cheaper monomers. One of the most popular of these consists of 85% vinylidene chloride and 15% vinyl chloride--more commonly known as Saran wrap.
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Beyond Food
PVDC is more than merely a barrier. It's heat sealable on both sides and provides anti-static protection. It's available in an anti-mist grade, so it can be used as box overwrap, to create fill seals, pre-made bags, and for lamination. It's almost colourless and decomposes at an extremely high melting point, unlike plastic. As a barrier layer, it resists acids, alcohols, and alkalis well, making it ideal for medical films. To improve its resistance to organic solvents, PVDC can be mixed with methyl acrylate and other monomers, which make it ideal for giving fibres a higher amount of acid and alkali resistance up to 100° C. When used this way, PVDC is a weather-resistant coating with the thermal stability of a polymer. All in all, PVDC is a remarkably agile copolymer that can reduce the use of plastic across several industries.
Moisture, Vapour, Oxygen
PVDC's water vapour transmission rate is an impressive 120 g/m2. A single good coating can outperform many alternative packaging materials. It prevents gases from getting in and out of the package by forming a barrier against oxygen and water vapour. It can be used on diverse substrates. Its water and gas permeability doesn't change depending on the substrate, which means it can safely be used to seal packages of moist foods and fluids. Its exceptional oil resistance prevents grease penetration and packaging discolouration. Add heat sealability, and you have a lightweight seal that can be applied in a single-ply layer.
Winning The War Against Plastic
PVDC can be applied in a film at a density of 2g/M2, so while the polymer does contain some plastic, your packaging can still be classified as compostable. Large brands from around the world are phasing out plastics thanks to alternatives such as PVDC. Thin compostable barriers reduce the weight requirements of packaging, further improving their eco-friendliness. PVDC can also be used to coat packaging film or be used as a printable, sealable label. The market has been growing at a steady 4.7% rate since thanks to rising demand.
Find Out More
PVDC is one of the coated film market's rising stars, offering efficient barriers that protect your products and add to their shelf life. It's efficient, fuss free, and food-safe, adding to product presentation while improving the properties of the plastics and paper packaging it coats. To find out more please call 828 208 and speak with one of our technical sales team.
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Ideal combination of fundamental properties for food packaging solutions
Aqueous Diofan® PVDC dispersions enhance and upgrade packaging materials by giving them barrier properties which prevent the transmission of water vapor or oxygen, as well as odor absorption.
Diofan® PVDC coatings provide strong seals to make hermetic packages and improve the appearance of packaging through their transparency, gloss, print-adhesion, and scratch resistance.
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Diofan® PVDC on Oriented PP Films
Biaxially oriented polypropylene (BOPP) films are widely used for the packaging of biscuits, confectionery, snacks, cereals, salads & fresh products, overwraps for tobacco and perfumes, pet care, etc. which are very sensitive to humidity and oxygen. The sealability of BOPP films is obtained by coextrusion of different types of polypropylene. Sometimes, the sealing and the barrier properties are not sufficient to conveniently close the package and give adequate protection to the food.
For these reasons, most BOPP film producers have developed Diofan® PVDC coated structures that give good sealing properties as well as an enhanced water vapor or gas barrier. BOPP films coated with Diofan® PVDC on either one or both sides can be found in a variety of packaging applications.
Diofan® PVDC on PET Films
As well as oriented polypropylene, PET films are widely used in complexes for various packaging applications. When PET films are associated with Diofan® PVDC coatings, they become suitable as high-performance barrier films that can be used for example as a lid for thermoformed trays to pack fresh food, even under modified atmosphere (MAP). These films can also be found in stand-up pouches and in transparent and printed packaging solutions to protect fatty products like baked food, chocolate, olives, etc. Diofan® PVDC coated and laminated PET films can be pasteurized and used in the microwave.
Diofan® PVDC on Paper and Cellulosic Substrates
Due to their unrivaled performance profile, advanced paper and board packaging structures with Diofan® PVDC coatings are used to package bakery products, freeze-dried products, and water-sensitive materials, such as salt or bicarbonate.
The portfolio of solutions offers an effective barrier against the migration of contaminants into packaged foods, such as mineral oil (MOSH, MOAH) and other non-intentionally added substances. This protective feature is coupled with an improved sustainability profile compared to other Polyolefin based alternatives.
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