Why are some foods more difficult to vacuum-seal?
Not all foods react the same way to vacuum sealing.
This complexity stems from three main factors:
1. Natural oxidation
Products such as oil-rich nuts, protein snacks, and processed foods containing vegetable fats and whole-grain flours tend to oxidize quickly when exposed to oxygen.
2. Natural gas emissions
Some foods release tiny amounts of gas over time, affecting the stability of the bag.
Examples:
- cooked legumes,
- dried leavened products,
- dried fruit high in sugar.
3. Irregular behavior under compression
Products that expand or compact unevenly (e.g., herbal products) can result in misshapen or unstable bags.
These concepts draw on principles studied in food science, particularly in the dynamics of thermal processing and preservation.
For an overview of current technologies, visit the page dedicated to automatic vertical packaging machines.
Oxidation: monitoringof residual air andbag integrity
Oxidation is a process that compromises both quality and shelf life.
To effectively reduce it, VAI :
- fractional vacuum cycles, ideal for sensitive products;
- extraction time adjustable based on density;
- monitoring of residual pressure to ensure a truly stable vacuum;
- temperature-controlled sealing bars to prevent micro-leaks.
As explained in the article Vacuum Sealing for Dried Fruit, maintaining shape and freshness depends on the balance between air extraction and controlled compression of the product.
If necessary, customers can explore the full range in the VAI packaging machines.
Residual gases: dynamic parameters for “breathing”products
Foods that cause gas require specific technologies. VAI a combination of:
1. Gradual vacuum: reduces the risk of the product expanding suddenly during the cycle.
2. Intermediate pause: allows the product to “settle” and release any trapped air bubbles before sealing.
3. Pressure-controlled sealing: ensures a stable bag even if slight internal variations occur.
This feature reduces bag deformation over time and improves palletizing, a topic closely related to the one discussed in the article “Logistics Optimization in Industrial Packaging.”
Technical films for challenging food applications: stiffness, transparency, and protective barrier
Choosing the right film is essential, especially when the product is sensitive.
The most suitable films are those with:
- high-security barrier;
- balanced stiffness to prevent lateral buckling;
- controlled transparency for commercial products;
- compatibility with intensive vacuum cycles.
These materials must maintain their integrity even after transport, during which they may be subjected to significant stress. The function of the film is discussed in detail in the article The Role of the Film in the Final Result of the Bag. For those wishing to evaluate operational solutions, the section automatic packaging machines is a useful starting point.
Simulation and testing: how to predict bag deformation
For complex foods, VAI 3D simulations in a controlled environment to predict:
- potential points of failure in the bag;
- prediction of film behavior;
- stability on a pallet;
- Preliminary volume assessment under vacuum conditions.
This methodology is similar to that used in format engineering and ensures a high level of precision even before production begins. Additional solutions are available in the VAI packaging machines.
Real benefits for those who package challenging foods
When a vacuum system is designed correctly, the benefits are clear:
- reduction ofoxidation;
- longer shelf life;
- more compact and uniform bales;
- reduction in returns;
- more efficient logistics;
- a more consistent brand image.
These results impact the entire production cycle and reinforce the perception of quality.
A vacuum-sealed container designed to protect: VAI expertise
Handling “difficult” foods requires technical expertise, dynamic parameters, and precise design.
Vacuum packaging becomes a powerful technology when every variable—film, density, vacuum parameters, simulations—is tailored to the product’s specific needs.
To initiate a study on your food product and verify the vacuum-sealing performance, you can contact our team via the automatic vertical packaging machines: protecting a complex product requires technology that truly understands its behavior.
The approach we take in developing these solutions
- MV305 — VFFS packaging line with a vacuum carousel, for bags holding up to 25 kg of powdered and granular products. This configuration is designed to ensure an extended shelf life, protection against atmospheric contamination, and pallet stability during long-distance transport.
- VS99 and TFD — alternative configurations based on the requested format and finish.
Sectors where vacuum packaging has the greatest impact: dried fruits and legumes, flour products, rice, and grains.
