IN Brief:
- SISTERS scaled bio-based, home-compostable packaging from development into industrial food-processing trials.
- Stretch films, sealing films, and rigid trays were tested on lines handling products including fresh-cut apples, peppers, and cheese.
- Commercialisation planning now has to turn validated materials into packaging that can be manufactured, qualified, supplied, and recovered at scale.
The EU-funded SISTERS programme has taken bio-based and home-compostable food packaging into industrial-scale trials, running new stretch films, sealing films, and rigid trays on operating food-processing lines.
The materials were tested with products including fresh-cut apples, sweet peppers, and cheese, moving the work beyond laboratory samples into production conditions where films and trays have to tolerate machinery, product moisture, sealing, handling, and distribution. SISTERS reports that the packaging delivered effective food-safety performance and, depending on the food involved, preservation equal to or better than conventional plastics.
The programme ran from November 2021 until April 2026 under Horizon 2020, with total project costs of just over €10.1 million. Its remit extended across production, logistics, retail, and consumption, but the packaging work tackled one of the harder industrial questions inside the project: whether lower-impact materials could perform when exposed to the mechanical and process demands of actual food lines.
The developed formats include active additives such as artichoke leaf extracts intended to support preservation while reducing reliance on conventional fossil-based plastics. That combination of material substitution and active functionality adds complexity, because a pack still has to meet the same fundamental production requirements regardless of the environmental case made for its substrate.
Sealing temperature, web tension, stiffness, barrier performance, surface behaviour, dimensional stability, and product interaction all influence whether a material can run at useful speeds. A promising polymer structure can become commercially awkward if it increases downtime, narrows operating windows, creates inconsistent seals, or requires repeated intervention from operators.
Industrial trials therefore represent a more demanding test than laboratory property measurements. The material has to feed through established machinery, tolerate handling, seal consistently, protect the food through its intended shelf life, and do so without introducing a level of scrap or lost output that makes the sustainability gain commercially unattractive.
SISTERS also developed reusable BulkBox and StoreBox containers fitted with sensors for temperature, humidity, carbon dioxide, and oxygen. The systems were trialled with perishable products including mushrooms, berries, spinach, salmon, and cheese, linking packaging development with the environmental conditions that determine how quickly food loses usable life during transport.
That broader approach avoids treating the package as the only source of waste. A lower-impact film brings little benefit if poor temperature management causes the food inside it to be rejected, while a technically protective pack can create a different problem if its material cannot be recovered through the waste system available in the market where it is sold.
The end-of-life issue is especially relevant to compostable materials. Consumer work involving more than 6,500 people found positive attitudes towards bioplastics alongside persistent confusion over how they should be discarded. A material designed for a particular disposal route can therefore lose much of its intended benefit if consumers, collection systems, and treatment infrastructure do not send it to the correct destination.
Packaging producers and food companies are having to make those decisions against a tighter European regulatory background. PPWR began applying across the EU on 12 August, adding a common framework around packaging reduction, recyclability, material use, documentation, reuse, and other requirements rather than allowing sustainability projects to be judged solely against voluntary corporate targets.
No regulation removes the underlying production test. A compostable, fibre-based, reusable, or lightweighted pack still has to survive filling and sealing, move through conveyors and secondary packaging equipment, protect the food, meet applicable food-contact requirements, and remain available in the quantities needed to support production schedules.
The difference between a successful pilot and a commercially useful packaging platform is largely a question of scale and repeatability. Metsä’s Muoto fibre programme is moving towards production exceeding 100 million packs a year, illustrating the capital and manufacturing step required after a new format has proved that it can work.
SISTERS has not announced comparable dedicated packaging capacity, but the consortium has completed financial forecasts, business planning, and a go-to-market roadmap around its exploitable technologies. Those documents now have to translate into converter relationships, material supply, machinery qualification, customer trials, and disposal routes capable of supporting repeat production.
The programme’s retail work offers a similar progression. Good-practice guidelines and a Seal of Excellence were piloted in 35 EROSKI stores across six Spanish provinces, while its surplus-food platform involved around 300 primary producers. In each case, the technology was tested beyond a controlled development environment before the project’s formal close.
The packaging trials have now crossed the same threshold. Running home-compostable films and trays on real food lines establishes that the materials can enter industrial production; it does not establish that they can yet be supplied economically across a large packaging network.
The remaining work is less glamorous than materials research but considerably more decisive. Consistent manufacture, converter output, line qualification, customer specifications, waste infrastructure, and cost per pack will determine whether the SISTERS formats become routine production materials or remain well-executed demonstrations of what could be manufactured.
