Packing coffee: heat sealers, fillers and packing lines
Packing is where a growing roastery loses the most hours. When to move from a scoop and a sealer to a weigher, and from a weigher to a packing line, and what each step costs in accuracy and flexibility.
7 min read Updated 9 October 2026
A small roastery packs by hand: scoop, weigh, seal, label. It works until the week you need several hundred bags. Each step up in automation saves labour and improves consistency, but adds cost, changeover time and minimum runs.
The stages
| Stage | Typical setup | Suits |
|---|---|---|
| Manual | Scoop, bench scale, impulse or band heat sealer, hand labelling | Low volumes, many coffees, many bag sizes |
| Semi-automatic | Weigh-filler (auger or linear weigher) dispensing into bags held by hand, band sealer, label printer | Growing volumes with frequent coffee changes |
| Automatic | Form-fill-seal or premade-bag line with weigher, valve applicator, sealing and coding | High volumes of fewer products; long runs |
Heat sealers
Impulse sealers heat a wire briefly and suit low volumes and thin films. Continuous band sealers carry the bag through heated jaws and suit steady runs. Match the sealer to your bag material: laminated coffee bags often need higher temperatures or specific jaw profiles. Test seals by pulling and by squeezing a sealed bag with air in it.
Valves and degassing
Freshly roasted coffee releases carbon dioxide for days. Bags without a one-way degassing valve can swell and burst if sealed too soon. Use valved bags, or rest coffee before sealing. Many roasteries do both.
Nitrogen flushing
Flushing bags with nitrogen lowers the oxygen inside and can slow staling, which matters for coffee with a long route to market. It needs a nitrogen supply and suitable equipment. Many specialty roasters selling within weeks of roasting do not flush.
Fill accuracy
UK law on packaged goods sold by weight uses the average system: on average a batch must contain at least the declared quantity, with limits on how far individual packs may fall short. Overfilling to stay safe costs coffee; a good weigher lets you fill closer to target. See coffee labelling.
Questions before buying packing equipment
- Packs per hour you need now and in two years
- Number of coffees and bag sizes per day (changeover time)
- Bag format: flat-bottom, side-gusset, stand-up pouch
- Accuracy figure from the maker for your fill weight
- Space, power and compressed air needs
- Cleaning time and allergen changeovers
Where Roastnet helps
Questions roasters ask
- What sealer do I need for coffee bags?
- One rated for your bag's material and thickness. Band sealers suit steady volumes; impulse sealers suit low volumes. Test seals before committing.
- Do coffee bags need a valve?
- Not legally, but whole bean coffee packed soon after roasting needs a way for carbon dioxide to escape, which is why most roasters use one-way valves.
Official sources
Rules change. These sources were checked on 9 October 2026; always confirm the current position with the body that publishes them before you act.
Read next
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The first hire is rarely a roaster. It is usually someone to pack, dispatch and clean so the founder can roast and sell. How to plan the roles, the hours and the legal basics.
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