Beyond bags per minute: 10 checks serious buyers make before choosing a high-speed VFFS machine

Consider this. On a normal day, thirty seconds barely matters to most of us. On a high-speed bagger, it's roughly the difference between a film splice on a well-designed, ergonomic machine and one on a poorly designed machine. Most buyers never think much about it.

Do the maths on a three-shift line, though. You change film rolls around 30 times a day, so thirty extra seconds per splice is 15 minutes of lost production every day. At 120 bags a minute over 300 working days, that's 540,000 bags a year you've paid for in capacity and never sold.

I've been designing and building machines for over two decades, the last few on high-speed VFFS. One thing I keep seeing is that machines get bought on the spec sheet, and the money gets lost on the shop floor, in the small gaps between the two. And yes, every OEM quotes mechanical maximum speed, us included. So this piece is about the questions I'd ask if I were sitting on the buyer's side of the table.

The numbers in this article

To keep things comparable, I've used one reference line throughout: 120 bags a minute, three shifts (about 22 running hours a day) and 300 days a year. That's roughly 158,000 bags a day, or 47.5 million bags a year.

On a line like that, one minute lost per day works out to 36,000 bags a year. Keep that figure in mind and everything below scales easily to your own line. The assumptions are illustrative and on the conservative side, so plug in your own numbers and your own cost per bag.

Before anything else: do you really need continuous motion?

Honestly, not everyone does. Continuous-motion machines earn their price at high speeds, where sealing time becomes the bottleneck. Below roughly 60–80 bags a minute, depending on the bag and the product, a good intermittent machine is often the smarter and cheaper choice. The same goes for heavy fills, or products that need time to settle in the bag.

A supplier who tells you when you don't need their top-end machine is usually one you can trust on everything else. If you do need the speed, read on.

Ten things I'd check, and what they cost

1. Speed on your product, not on paper

Start with a simple question: what speed will this machine hold with my product, my fill weight, my bag length and my laminate? In practice it's usually the filler that sets the pace, whether that's a multi-head weigher, an auger or a piston filler, not the bagger. If a machine quoted at 120 settles at 110 on your product, you lose about 4 million bags a year. This is the biggest gap I see between the brochure and the floor.

At the trial: run your product at target speed for at least 20 minutes and count good bags, not cycles. If every answer starts with "up to", be careful.

2. Registration that stays put

Print registration usually looks perfect once the machine has settled. Check it at start-up and right after a stop as well. If even 0.1% of bags come out off-register and get rejected, that's around 47,600 bags a year, film and product included.

At the trial: look at bags from the first minute, after 20 minutes and straight after a restart. If the operator keeps tweaking the registration offset during the demo, that tells you something.

3. Seals, with product in the way

Every product tries to get into the seal: crumbs with snacks, dust with powders, splashes with liquids. Ask how the machine keeps it out and how it catches a bad seal. Rejecting 0.5% as leakers costs about 238,000 bags a year. The ones that slip through cost more, in stale product on the shelf, complaints and returns. With nitrogen flushing, a weak seal also wastes gas and cuts shelf life.

At the trial: pull bags at full speed, with nitrogen on if you use it, and leak-test them yourself. Ask how the jaws get enough sealing time at that speed. If seal tests are only shown at reduced speed, ask why.

4. What every restart costs

You won't find this one in a quotation. Every stop costs you scrap bags on restart, plus the time it takes to get back to stable speed. Take 30 stops a day (splices included), 6 scrap bags per restart and 20 seconds to recover, and that's about 414,000 bags a year.

At the trial: stop and restart the machine five times. Count the rejects, time the recovery, then multiply by your own stops per shift. A demo that never stops hasn't shown you anything here.

5. Changeover, with a stopwatch

Ask how long a full format change takes, from the last good bag of one product to the first good bag of the next, done by your own operator. One changeover a day that takes 20 minutes longer than it should adds up to about 720,000 bags a year, and a lot more if you run many SKUs.

At the trial: time it yourself, covering the forming set, film, settings and first good bag. Your operator should do it, not the supplier's engineer. If the answer on changeover time is "it depends", be careful.

6. Roll changes

This is the thirty-second example from the start: over 30 splices a day, it comes to about 540,000 bags a year. Then there's the film itself. Waste 3 metres per splice and you throw away roughly 108,000 bags' worth of film a year, at a 250 mm bag length.

At the trial: watch a full roll change, time it and measure the waste. If auto-splicing is on offer, ask what it really saves in time and film waste. If the demo has no roll change in it, ask for one.

7. The film you'll be running in three years

Film prices are moving, and so are packaging regulations. Can the machine run a thinner film, recyclable mono-PE, or film from a second supplier? Say your film costs about US$0.007 a bag. If the machine can't take a film that's 10% thinner, you're leaving roughly US$33,000 a year on the table, for as long as you own the machine.

At the trial: bring the film you plan to use next, not just today's. "We'll validate that after installation" isn't an answer.

8. Weight accuracy and giveaway

Don't settle for the average weight. It's the spread that decides how much you overfill to stay legal. On a 100 g pack, a standard deviation of 1.5 g instead of 0.8 g means running about 1.4 g heavier on every bag. On the reference line, that's around 66 tonnes of product given away a year. Also ask who owns the link between filler and bagger when the two don't keep pace.

At the trial: check-weigh at least 100 bags in a row at full speed and work out the standard deviation yourself.

9. Getting back up after a fault

When the machine stops, can your operator see why and fix it without calling a specialist? Three faults a day that each run 10 minutes longer while someone waits for the right person cost about 1.08 million bags a year.

At the trial: trigger a few common faults, such as a film break, a registration error and an empty hopper, and see who fixes them and how fast. Ask to see the alarm history and downtime data, and get the remote-support response time in writing. If recovery needs a laptop and PLC access, think twice.

10. The next ten years

Ask what it really takes to clean, service and keep the machine running for a decade. Twenty extra minutes of cleaning a day costs about 720,000 bags a year. One two-day wait for a technician or a spare part costs about 317,000 bags.

At the trial: time the cleaning procedure. Find out which spares are stocked and their lead times, what safety category the guarding meets, and who takes responsibility when the whole line underperforms, not just the bagger. Spares that are made to order, with no committed lead time, are a risk you'll carry for years.

No line has all ten problems

If you add all ten up, you get a number nobody would believe, and you shouldn't. No line suffers from all of them. But most suffer from two or three, and on a line like our reference line, that alone is usually a million bags a year or more.

The one test that covers everything is this: run your product, on your film, at your speed, for long enough to see the losses. A supplier who believes in their machine will welcome it.

That's exactly what we'll be doing, live, on a VAYU continuous-motion VFFS at Gulfood Manufacturing: Dubai World Trade Centre, Sheikh Saeed Hall, India Pavilion, Stand S-K53, 3–5 November 2026. Bring your pack and your questions. Can't make it to Dubai? Send us your product and film, and we'll run the trial for you at our facility in Hyderabad.

About the author

Harshavardhan Sripathi is Director – Sales Engineering & Operations at Innomation Equipments in Hyderabad, India. He has spent two decades designing and building special-purpose machines, and today leads the development of Innomation's high-speed packaging range, including the VAYU continuous-motion VFFS series and multi-track stick-pack machines.

Founded in 2005 and ISO 9001:2015 certified, Innomation designs, machines, builds and services its equipment in-house for the food, FMCG, and pharmaceutical sectors. You can reach him at harsha@innomationequipments.com.