Sustainable Packaging
Learn how food packaging controls oxygen, moisture, aroma and physical damage to protect freshness, flavour and shelf life.
Open a packet of chips that has been left unsealed for a day and it will probably feel different. The crunch disappears. Coffee left exposed loses much of its aroma. Nuts can develop stale flavours, while a dry powder can start clumping in humid conditions.
The food has not changed because the recipe suddenly became different. Its environment changed.
That is one of the most important jobs of food packaging. Beyond containing a product and carrying a label, packaging controls how much oxygen, moisture, light and outside contamination can reach the food during storage.
The right packaging cannot keep food fresh forever, but it can slow many of the changes that affect quality and shelf life.
Oxygen can change flavour, colour and aroma
Oxygen is useful almost everywhere in daily life, but inside some food packages, too much of it can become a problem.
It can contribute to oxidation, which may affect fats, flavours, colours and nutrients. Foods containing oils and fats, including nuts, snacks and coffee, can be particularly sensitive.
Controlling oxygen inside packaging can help limit oxidative changes and maintain food quality for longer, as explained in this overview of oxygen control in food packaging.
This is why coffee packaging, for example, does much more than simply hold the beans or grounds. The package needs to slow the entry of oxygen after it has been sealed.
The amount of oxygen that passes through a packaging material over time is therefore an important part of material selection.
Moisture can either enter the food or leave it
Moisture creates a different problem because foods do not all need the same moisture conditions.
Chips and crackers need to stay dry. If water vapour enters the package, they can lose their crispness.
A cake or bakery product has the opposite problem. If too much moisture escapes, it may become dry or hard.
Powders, spices and dry foods can absorb moisture from humid air and begin to clump or change texture.
Packaging therefore needs to control moisture transfer in the right direction for the product.
The movement of water vapour through packaging plays an important role in how well foods maintain their texture and quality during storage.
This is why two products sitting next to each other on a supermarket shelf may need very different packaging even if their packs look similar.
Aroma needs to stay inside the pack
Freshness is not only something we see or feel. We smell it too.
Coffee is a simple example. Much of what makes freshly opened coffee appealing comes from volatile aroma compounds. If those compounds gradually escape through the package, the product may still be safe to consume but no longer smell or taste as fresh.
The same principle applies to tea, spices and other strongly aromatic foods.
Packaging materials are therefore selected not only to stop substances coming in, but also to control what moves out.
Good oxygen and aroma barriers can help slow the loss of volatile compounds that influence how a product smells and tastes.
This is an important part of shelf life that is easy to miss. A product can technically remain edible while its flavour and aroma have already declined.
Light can also affect sensitive foods
Not every package needs to be transparent.
Light can trigger chemical reactions in some foods, particularly products containing light-sensitive fats, pigments or vitamins. This is one reason milk, oils and certain beverages may use opaque or coloured packaging.
The package therefore has to balance visibility with protection.
For some brands, letting consumers see the food is useful. For others, protecting the product from light is more important.
Again, there is no universal answer. The food determines the requirement.
The seal is part of the barrier
Even an excellent packaging material will not protect food properly if the package itself is not closed correctly.
A weak seal, tiny channel or damaged edge can create a path for oxygen and moisture.
This is why seal integrity is just as important as the barrier value of the material itself.
Packaging performance depends not only on the material but also on seal and closure integrity, especially when the product needs to maintain controlled conditions throughout its shelf life.
This becomes particularly important for flexible packaging, where the material needs to form reliable seals repeatedly on a production line.
Packaging protects against physical damage too
Barrier performance gets a lot of attention, but sometimes the simplest job of packaging is mechanical protection.
Biscuits can break. Chips can be crushed. A pouch can puncture during transportation. A seal can fail when packs are stacked or dropped.
Packaging therefore has to survive more than storage on a shelf. It may travel through filling lines, cartons, warehouses, trucks and retail displays before reaching the consumer.
Freshness only matters if the package stays intact throughout that journey.
Shelf life is not decided by packaging alone
It would be easy to say that better packaging always means longer shelf life, but the relationship is more complicated.
Shelf life also depends on the food formulation, processing method, hygiene, temperature, storage conditions and distribution chain.
The conditions a product experiences during storage and handling can significantly influence its actual shelf life.
Packaging is therefore one part of a larger system.
Its job is to create and maintain the environment the food needs for as long as possible.
Different foods need different levels of protection
This is why there is no single barrier specification that works for every food.
Coffee may need strong oxygen and moisture protection. Snacks depend heavily on keeping moisture out. Nuts need protection against oxidation because of their natural oils. Dry powders may mainly need protection from humidity.
A package should therefore not be designed around achieving the lowest possible barrier number simply because it sounds better.
It should provide enough protection for the required shelf life of that specific product.
That also means shelf-life trials remain important whenever a brand changes packaging materials.
Where Pippa fits into shelf-life protection
At Pippa, this is how we think about functional paper packaging.
Paper provides the base structure, while our bio-based coating is designed to add the protective functions that untreated paper may not provide on its own.
Pippa's coated structure provides oxygen and water-vapour barrier performance, along with oil and grease resistance and heat-sealing properties. Current reported results include an average OTR of 0.9 and WVTR of 0.6 on the tested coated-paper structure. You can explore the Pippa technology in more detail here.
Those numbers are useful, but they are not the final answer to whether a package will protect a food for six months, nine months or longer.
The actual product still needs to be packed, sealed and tested under the conditions in which it will be stored and sold.
For us, that is the most useful way to think about packaging performance.
The goal is not simply to create paper with a good barrier number. It is to give the food the protection it needs so that freshness, flavour and quality survive the journey from production to the moment the package is opened.
FAQs
1. How does food packaging help keep food fresh?
Food packaging helps control exposure to oxygen, moisture, light, contamination and physical damage, all of which can affect freshness and quality.
2. How does packaging affect the shelf life of food?
Packaging can slow oxidation, moisture transfer, aroma loss and other changes that reduce food quality, helping the product maintain its intended shelf life.
3. Why is oxygen protection important in food packaging?
Too much oxygen can cause oxidation, which may affect flavour, colour, aroma, nutrients and fats in foods such as coffee, nuts and snacks.
4. How does moisture affect packaged food?
Moisture entering a package can make dry foods lose crispness or clump, while moisture leaving a product can make foods such as cakes and bakery products become dry.
5. Why is aroma retention important in food packaging?
Aroma compounds contribute strongly to flavour and freshness. Packaging helps reduce their loss, particularly in products such as coffee, tea and spices.
6. Does better packaging always mean a longer shelf life?
No. Shelf life also depends on factors such as food formulation, processing, hygiene, temperature, storage conditions and distribution.
7. Why is seal integrity important for food shelf life?
Even a high-barrier packaging material can fail if the seal allows oxygen, moisture or contaminants to enter the package.
8. Do all foods need the same barrier packaging?
No. Coffee may need strong oxygen and moisture protection, snacks need moisture resistance, and oily foods may require additional grease protection.
9. How does Pippa help protect food freshness?
Pippa’s bio-based coating is designed to give paper oxygen and water-vapour barrier performance along with oil, grease and heat-sealing properties.
10. Can Pippa improve the shelf life of every food product?
Shelf-life performance depends on the specific food, packaging structure and storage conditions. Pippa-based packaging therefore needs to be tested for each application.
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