Two families of vacuum machines, two different economies
“Vacuum machine” on the RFQ form covers two different technologies. The chamber machine places the entire bag inside a vacuum chamber—air is drawn out of the chamber and the bag simultaneously. The nozzle machine inserts a suction nozzle into the open neck of the bag—the bag is moved, not the chamber. This one-sentence difference determines the machine's cost, speed, and the bag sizes it can handle.
A strategic comparison of vacuum versus vertical form-fill-seal (VFFS) machine lines is already available. Vacuum packaging vs VFFS — the article answers “do we need a vacuum at all.” This one answers the second question: “which vacuum cleaner.” A depiction of the automatic vacuum lineup in Automatic vacuum packaging machine.
Chamber: bag goes into the box
The bag is placed in a sealed chamber; the pump draws air from the entire chamber until the pressure drops; the internal and external pressures of the bag equalize, then the sealing jaws close the bag before air is allowed back in. Results: the deepest vacuum (residual oxygen below 11 ppm), uniform compression, and the option of gas flushing (nitrogen for cheese and soft products — the bag does not fully adhere to the product).
Speed: 20–40 second cycles — single table 1–2 bags per minute, alternating dual-chamber 3–4 bags/min (operator loads one chamber while the second chamber is running). Bag size is limited by chamber size: the tabletop model accepts A4 bags, the floor model up to 50 × 40 cm. For meat, cheese, fish, and retail cuts — this is the standard machine.
Nozzle: suck the bag necks one by one
The suction nozzle is inserted into the neck of the open bag (pre-made 5–25 kg bags), the pump draws out the air, and the nozzle is withdrawn as the jaws or clips seal the bag. No chamber means no bag size limit — this is the only technology for 25 kg rice sacks, 10 kg factory beans, and bulk frozen foods.
Speed: 20–60 seconds per bag depending on size; a conveyor line with 2–4 nozzles reaches 4–8 bags per minute with two operators. The vacuum is shallower than in a chamber (residual oxygen 1–31 ppm) because the bag neck remains open during evacuation—enough for beans and grains, not for fresh meat for weeks.
Results table
| Situation | Choose | Reason |
|---|---|---|
| Meat, fish, cheese — portions of 200 g to 2 kg | Chamber (dwi) | Internal vacuum + optional gas flush |
| Nuts, grains, rice — bags of 5–25 kg | Nozzle | A chamber of that size does not exist in practice. |
| Small kitchen production, 200 bags a day | Table chamber | Lowest cost, no conveyor |
| Bulk plant: 500+ large bags per day | Multiple nozzle + conveyor | Lowest per-bag wage |
| Soft products (cakes, crackers) | Chamber + N2 | Full crushing — specify product |
Six questions that determine the model
- Largest bag size — immediately closes the chamber/nozzle debate.
- Targeted residual oxygen — below 1% (oxide-sensitive fat, meat) = chamber; 1–3% sufficient (roasted beans) = both.
- Day bag — under 200 tables; 200–2,000 dual-chamber; large bags 300+ conveyor nozzles.
- Wet or dry product — liquids boiled at low vacuum (coconut milk, marinades require a chamber with a liquid-stop function or a controlled suction level).
- Gas flush needed? — cheese, soft products, long-distance export: yes. Standard chamber supported; nozzle limited.
- Pump — capacity and oil — dry vs. wet pumps, service reach and maintenance kit prices. The pump is the heart of the machine; the jaw gasket wears out every 6–12 months with daily use.
Use in the full SME context How to choose a packing machine for an SME; inner bag sealing base Bag Sealing Machine Guide. For the factory beans coming out of the drying line — a classic example of a nozzle product — see Automatic granule packaging machine.
Common mistakes
- Buying a chamber table for 10 kg bags — bag not entering the chamber; bought twice in the first year.
- Full vacuum on sharp products — fish bones and dry pasta puncture bags from the inside; lined bags or trays are required.
- Ignoring pump oil — The oil-lubricated pump, without annual oil changes, gradually loses vacuum depth; QC doesn't seem to notice until customer complaints.
- Estimating the catalog speed on a bag full of liquid — liquid level limits suction time; always test with the actual product.
Both of them sit in the extended family. automatic packaging machine; for retail dry products, the starting point solid packaging solution.
Frequently Asked Questions (FAQ)
Can the chamber make 25 kg bags?
J: A chamber that large technically exists but is rarely worth it — the nozzle wins out in terms of size for both cost and floor space.
Can you vacuum a zippered bag?
J: The zipper adds an extra layer of complexity to the seal — most flat-bag vacuum manufacturers then add the zipper via a separate zipper-closing machine on their premium line. Vertical Form Fill Seal vs Pre-formed Bag Explain the position of the zipper bag.
How often are jaw gaskets replaced?
J: Follow the running hours and product—oil every 3–4 months, dry every 6–12 months. Keep gasket stock; a 3-week order delay means the machine stops.
Nozzle and chamber — one machine, two modes?
J: It exists as a niche hybrid machine; most factories buy according to the dominant volume and outsource the other.
Related pages
Vacuum packaging vs VFFS | Automatic vacuum packaging machine | Bag Sealing Machine Guide | Automatic granule packaging machine
Specify the product, bag size, and bag target per minute. Get a quote, specifications and delivery timeframe.
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