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Nitrogen Flushing in Packaging: Why Crisps and Coffee Last Longer
- Replaces oxygen with nitrogen
- Slows rancidity and staling
- Cushions fragile snacks
- Pack stays puffed
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How Nitrogen Flushing Works
- The filled pouch moves into the sealer.
- A nozzle blows nitrogen into the pouch, pushing air out.
- The heat-sealing band closes the pouch while the nitrogen is inside.
- The pack is coded (batch, dates) and checked.
Nitrogen comes from cylinders or an on-site nitrogen generator. It is inert, tasteless and already makes up most of the air we breathe.
Which Products Benefit?
| Product | Why nitrogen helps |
|---|---|
| Crisps and fried snacks | Slows oil going rancid; cushions against breakage |
| Nuts and seeds | Oils oxidise in air |
| Ground coffee | Keeps aroma longer |
| Milk powder, infant foods | Protects fats and nutrients |
| Dried fruit, granola | Slows staling and colour change |
Nitrogen Flushing vs Vacuum Packing
| Nitrogen flushing | Vacuum packing | |
|---|---|---|
| Pack shape | Puffed, cushioned | Tight to the product |
| Fragile products | Protected | May be crushed |
| Typical uses | Snacks, coffee, powders | Meat, cheese, rice, beans |
Sealing Machines at H-TECH
Nitrogen flushing continuous sealing machine KPL-FRQM-980CDKSh 290,000
Solid-Ink coding Band Sealer KPL-FRD-1000KSh 170,000
Plastic Bag Manual Heat Sealing Machine Mylar Bag Vacuum SealerKSh 17,000
Foot Operated SealersKSh 90,000
Hand Operated Sealing Machines(10cm)KSh 7,000| Product | Price |
|---|---|
| Nitrogen flushing continuous sealing machine KPL-FRQM-980CD | KSh 290,000 |
| Solid-Ink coding Band Sealer KPL-FRD-1000 | KSh 170,000 |
| Plastic Bag Manual Heat Sealing Machine Mylar Bag Vacuum Sealer | KSh 17,000 |
| Foot Operated Sealers | KSh 90,000 |
| Hand Operated Sealing Machines(10cm) | KSh 7,000 |
Current listed prices incl. VAT (updated 10 November 2026).
Compare sealing methods in induction vs heat sealing and the plastic bag sealing machine guide.
Tips for Good Results
- Use barrier pouches (e.g. metallised or foil laminates); ordinary plastic lets oxygen back in.
- Use food-grade nitrogen.
- Check seals daily; a weak seal undoes the flushing.
- Shelf-life claims on labels should be based on your own tests and food safety rules.
Frequently asked questions
Why do crisps packets have nitrogen?
Nitrogen replaces oxygen to slow rancidity and cushions the crisps against breaking.
Is nitrogen in food packaging safe?
Yes. Food-grade nitrogen is inert and makes up most of the air we breathe.
What is the difference between nitrogen flushing and vacuum packing?
Flushing replaces air with nitrogen and keeps the pack puffed; vacuum packing removes the air.
Does nitrogen flushing extend shelf life?
It slows oxidation; actual shelf life depends on product, packaging film and storage.
Where do I get nitrogen for packaging?
From gas suppliers in cylinders, or with an on-site nitrogen generator for large volumes.