FFS Packing Machine Micro-Stops: The Jams Your Shift Book Never Sees

On a form-fill-seal machine, much of the lost time comes not from breakdowns but from dozens of short stops a shift: a pouch caught in the cross jaws, a splice reaching the sealer, the weigher running dry for a few seconds, a crate full at discharge. The operator clears each in a minute or two and none reaches the shift book. On our worked ₹10-pack snack line, 39 such stops add up to about 54 minutes a shift and roughly ₹8,500 a day per machine, but only if you can sell every pack you didn't make.

By the Mama Editorial Team. For owners of namkeen, chips, snack and spice plants running FFS baggers fed by a multihead weigher, cup filler or auger. We take one machine, list where its short stops come from, price them, and compare what its PLC and a camera can tell you.

Key takeaways

• Short stops are a speed loss, not a breakdown. In the standard six-big-losses framework, stops "well under five minutes" that need no maintenance person count against Performance, not Availability (OEE.com).
• Five recurring sources: splices and reel changes, product in the end seal, filler starving or bridging, film tracking at the collar, and a blocked discharge.
• Count × duration is the whole game. In our example, 39 stops a shift averaging under 1.5 minutes cost about ₹4,300 a shift. No cause averages more than 4 minutes a stop.
• The PLC knows that the machine stopped, not always why. The PackML state model separates internal pauses (Held) from upstream/downstream pauses (Suspended), but a stop-reason record is optional, and many machines don't keep a usable history.
• A camera sees what happened around the stop: how often someone went to the jaws, how long the line sat before anyone arrived. It cannot see seal quality.

Why nobody writes these stops down

Clearing a jaw jam can take ninety seconds: open the guard, pull the crushed pouch, wipe the jaw, reset, run. Writing it down takes nearly as long, and the shift book has a line for "breakdown" but none for "the same small thing, 12 times".

Automatic data doesn't fully solve this. A study of six months of automatic OEE data from 23 Swedish companies and 884 machines found that unclassified losses were more than half of all recorded loss time, because loss categories were missing or poorly described. 702 of the 884 machines reported 100% performance, which the authors read as cycle times simply not being measured. And about 90% of classified downtime depended on operators' support work for its duration, not on the automatic process (Hedman, Subramaniyan and Almström, Procedia CIRP 57, 2016, full text). On many Indian FFS lines (our observation, not survey data), one operator and a helper run the machine while a supervisor covers several lines. Nobody's job is to count.

The five places an FFS machine stops

1. Film splices and reel changes

A laminate reel runs out, and unless the machine has an automatic splicer, it stops for the reel change. Automatic splicers exist: one snack-bagger maker claims its dual-spindle splicer joins a preloaded reel with "no interruption to the packaging process or machine downtime" (Bakery and Snacks, 2014). It is an extra-cost option that many mid-size plants skip.

The splice itself causes a second, smaller stop. One OEM notes that rolls sometimes arrive with splices in the middle, made by the film producer (Rovema). With splice detection, its machine halts when the flagged splice reaches the cross jaws, and the bag with the splice "must be removed manually" (Rovema error 0652). Without detection, the splice can reach the jaws unannounced. Splice tape stuck in the forming tube is also listed as a cause of film tracking faults (Viking Masek).

2. Product in the end seal (jaw jams)

The biggest line in our example below. A machine maker lists the causes of a jaw jam as "product in end seal", "incorrect timing between filler and bagger", jaws not set up properly and low jaw air pressure (Viking Masek). We would expect light chips, long strands like bhujia and seasoning dust to make it worse, but that is our reasoning, not measured data; your tally will show it. Another OEM stresses that "jaw alignment and spring bag gripper alignment are critical to quality seals" (Rovema).

3. The filler starves or bridges

The bagger is only as steady as what feeds it. On spice and powder lines with an auger filler, ratholing is when "only some of the powder flows, creating a void". The auger keeps turning, but "less, or even no, product is fed" (Frain Group). With sticky product on a multihead weigher, build-up is the problem: one weigher maker sells rotary screw feeders for "difficult to handle sticky products" to prevent it (Heat and Control / Ishida). The usual fix, a tap on the hopper or a scrape of the pan, is rarely recorded.

4. Film tracking at the forming collar

Laminate turns more than 90 degrees over the forming collar, which "has the potential to generate higher kinetic friction". That friction can cause wrinkling or tearing, and a high-friction film may stick to the sealing jaws (Rovema). If you buy laminate from several converters, watch whether this cause follows one supplier. An Indian maker of a collar-type twin-head bagger says its speed of up to 110 pouches a minute depends on "laminate structure and thickness" among other things (Packaging Gateway / Uflex).

5. Blocked at discharge

The take-away conveyor is full or the carton packer has stepped away, so the bagger has nowhere to put the next pack. The machine gets blamed; the cause is downstream.

What it costs: one machine, one shift

Assumptions (illustrative; time your own line before trusting any of them): a collar-type VFFS bagger packing a ₹10 MRP snack pack at an assumed 60 packs/min. For scale, Indian makers advertise up to 110 pouches a minute for one twin-head bagger and "120 plus packs per minute" for a snack system (Packaging Insights / Nichrome, 2011). ₹10 is one of the price points snack makers "rarely move away from", adjusting grammage instead (Agro & Food Processing, 2021). Assume a contribution margin of ₹1.20 a pack after material, freight and trade margin (yours will differ), so ₹72 per running minute. Two 8-hour shifts, 26 working days a month. Each restart is assumed to scrap 2 filled pouches at ₹5 of film and product each.

Add restart scrap: 39 restarts × 2 pouches × ₹5 = ₹390. Per shift: ~₹4,280. Per day (2 shifts): ~₹8,560. Per month (26 days): ~₹2.2 lakh. Over 300 working days: ~₹25.7 lakh per machine.

• No single stop looks worth fixing, yet the 90-second jaw jams are the biggest line.
• The shift book would show at most 8 minutes: the two reel changes, not the other 37 stops.
• The rupees depend on demand. ₹72 a minute is lost margin only if you could sell the extra packs, as in the run-up to the festive season (see festive peak capacity). In a slack month the same 54 minutes costs overtime and scrap. Plug your own numbers into the downtime cost calculator.

What the PLC knows, and what it doesn't

Does the PLC "already know"? Partly. The PackML state model used in packaging machinery distinguishes two kinds of pause (OPC 30050, OPC UA for PackML):

• Held: paused for conditions internal to the machine, such as "low levels on materials required for production or other minor issues requiring operator service". Jaw jams and reel-outs would usually sit here.
• Suspended: paused for conditions external to it. The spec calls the machine "starved" when upstream can't supply and "blocked" when downstream can't receive. A starving weigher and a full discharge would usually sit here, depending on how the OEM integrated them.

The same spec defines a StopReason record, "the first event captured during an abort, held, suspended or stop event", typically used for first-out fault reporting. But it is marked optional. Whether your machine logs it, keeps a history and lets you export it depends on how the OEM programmed it.

Even a well-programmed PLC has blind spots:

• It times the stop, not the response. A 3-minute Held state might be 20 seconds of clearing and 2 minutes 40 of waiting for an operator at the next machine. Different fixes.
• It reports the symptom. "Jaw obstruction" doesn't say whether it was product timing, dust or a splice.
• It can blur "running". The spec lets a Held or Suspended machine "dry-cycle", moving without producing. A machine cycling empty looks alive.
• Getting data out costs money: an OEM software change or a gateway.

What a camera adds

A camera over the bagger counts how often the guard opens and someone reaches into the jaws. It separates time until someone arrives from time spent clearing, and shows whether stops cluster after reel changes, around tea breaks or late in the shift.

Those patterns point to fixes: a jaw-cleaning routine if jams climb through the shift, a staged reel if changes run long, a second packer if blocking dominates, a word with the film supplier.

Look at the machine's pattern, not a named operator: "why does bagger 3 jam 10 times a shift", not who cleared it. Workers should know the cameras are there and why. Our worker CCTV notice under DPDP has a template.

What cameras cannot tell you here

• No seal quality. A camera cannot tell a sound seal from a leaker, or read nitrogen flush levels. That stays with the leak tester and QA.
• No view inside closed parts. Bridging inside a hopper, the jaw face behind a guard, or the film path inside the cabinet are often out of sight.
• No fault codes. It doesn't read the PLC alarm.
• Very short stops can slip through. Pauses of a few seconds, or a slow-down rather than a stop, are hard to see reliably.
• Movement is not production. A dry-cycling machine looks busy on video. Count packs at discharge, not jaw movement.

The best picture uses both: PLC states and counts where you can get them, the camera for response, clearing and what the PLC can't see.

Where Mama fits

Mama reads a factory's existing cameras, or cameras placed for the job, and every morning sends the owner a short plain-language note on where hours leaked the day before. For an FFS hall, that means stop counts and minutes per machine and how the time splits between waiting and clearing, as machine patterns with no operator ranking. It won't tell you a seal failed. It will tell you which bagger lost 50 minutes in stops nobody wrote down. Leave an email or phone in the form below and Mama will get back to you with a camera plan for your packing hall.

How to start this week

• Tally one machine for two shifts: a clipboard, one tick per stop under five headings (splice/reel, jaw, filler, film, discharge).
• Ask your OEM what the PLC logs. Does it keep stop reasons and a history, and can you export them?
• Price it with your own margin per minute, as in the table above.
• Fix the biggest count first, not the longest stop. In our example that is the jaws.

Planned stops are covered in SKU changeover on packing lines, the overall score in OEE explained, and overfill in product giveaway.

FAQ

What counts as a micro-stop on an FFS machine? A short stop, usually a minute or two and well under five, that the operator clears without a maintenance person. In OEE terms it is a Performance loss, not an Availability loss (OEE.com).

What causes FFS jaw jams in snack packing? Machine makers list product in the end seal (product still falling as the cross jaws close), filler-to-bagger timing, jaw setup and low jaw air pressure (Viking Masek).

Doesn't the PLC already record every stop? It records state changes, but a stop-reason record is optional in PackML, and not every machine keeps or exports one. Nor does it split waiting from clearing.

How much do micro-stops cost per day? In our worked example (60 packs/min, ₹1.20 margin a pack, two shifts), about ₹8,500 a day per machine, if you could have sold the lost packs.

Can a camera detect a bad seal? No. It counts and times stops and sees how they were cleared. Seal integrity and pack weight stay with the leak tester, checkweigher and QA.