Flow-Wrapping (Horizontal FFS)
Wrapping a discrete solid in a single web of film into a sealed pillow pack — the high-speed standard for individually wrapping bars, units, and trays. At speed, one cold seal jaw can open hundreds of packs before anyone notices.
One web of film, wrapped around a solid, sealed on three sides.
Flow-wrapping is a horizontal form-fill-seal technology that wraps a solid product in a single web of film, forming a sealed pillow pack with a longitudinal fin or lap seal and two end (crimp) seals. It’s the high-speed standard for wrapping discrete solid items — bars, sticks, single units, trays — protecting them and carrying graphics.
Where vertical FFS drops a flowable into a formed bag, flow-wrap is built for things with a shape: it wraps what’s fed to it, at very high speed, and the seals are formed around the product as it moves.
The levers are seal-jaw temperature and pressure, the film and sealant, registration (for printed film), speed, and product feeding. Two of them dominate: the seal jaws that close every pack, and the infeed timing that keeps product out of the crimp.
Product is fed on a horizontal conveyor into a former, film is wrapped around it with a longitudinal fin or lap seal, end seals close and cut each unit between products, and packs are coded with rejects for missing product or bad seals.
Process flow
Product fed on a horizontal conveyor into a forming box or former
Film wrapped around it; longitudinal fin or lap seal made
End (crimp) seals close and cut each unit between products
Coded; rejects for missing/short product or bad seals
Individually flow-wrapped solid units
Protect and present a solid unit — at a speed that hides failures.
Flow-wrap is about protecting and presenting a solid unit at very high speed, so seal integrity (fin and end seals) and barrier set the shelf life and protection, while print registration sets shelf appearance. The format earns its place on throughput — which is exactly why its failures multiply quietly.
At speed, an under-temperature jaw or a product caught in the crimp produces open seals and exposed product across many units before anyone notices without inline checks. The discipline is inline monitoring of fin and crimp seal integrity, infeed timing controls against product-in-seal events, a film barrier matched to shelf life, print-registration control on graphic film, verified coding legibility, and film/sealant substitutions requalified for sealing and barrier.
Food-contact film under 21 CFR 174–178; drug container-closure under 211.94 + USP <661>; ASTM F88 seal-strength testing anchors the rest.
Why a maker flow-wraps — and what they trade.
Flow-wrap is the fast, cheap way to individually wrap a solid. Knowing what it was chosen over tells you what the product needed.
Vertical FFS
VFFS handles flowable powders and liquids dropping into a formed bag.
Tray + lidding / shrink-wrap
Trays suit fragile or multi-count products.
Cartoning
A carton gives rigidity and a shelf face.
The gaps a reviewer looks for on a flow-wrapper.
None of these are exotic. They’re the quiet places open seals slip through at speed — recognizable the moment you’ve run a flow-wrapper.
Fin and crimp seal integrity isn’t monitored — open seals at speed expose product.
Product is caught in the end-seal from poor infeed timing, causing seal failures.
Film barrier isn’t matched to the product’s shelf-life needs.
Print registration drifts on graphic film — mis-cut, off-register packs.
Coding and date legibility aren’t checked.
Film/sealant substitution without sealing and barrier requalification.
Six things to check against your own records.
Not an audit — a read you can run yourself before anyone else does. Pull one recent run and walk it.
Ask how fin and crimp seal integrity are monitored inline.
Check infeed timing controls against product-in-seal events.
Confirm the film barrier suits the product’s shelf life.
Review print-registration control on graphic film.
Look at coding legibility checks.
Verify any film change was requalified for seal and barrier.
The same wrap, across very different solids.
The product changes — the discipline never does: hold the seal jaws, time the infeed, match the barrier.
Bars & single units
Protein and nutrition bars flow-wrapped at speed, where the fin and crimp seals carry freshness and the barrier holds shelf life.
Confectionery & baked goods
Individually wrapped candies, cookies, and snacks, where print registration drives shelf appeal and seal integrity protects.
Devices & single items
Flow-wrapped devices, wipes, and single units where container-closure and barrier matter to the product inside.
Soaps & solid units
Bar soaps and solid personal-care units wrapped for protection and presentation in one fast step.
Know the process. Now decide how far to take it.
These doors connect to this technology. None outranks another — pick the one that fits where you are.
Training
A course on flow-wrapping and the standard it has to meet — so your team understands seal-integrity monitoring, infeed timing, and barrier matching before they run or review the step.
Browse trainingService
Send us one record from this step — a seal-integrity log, an infeed-reject report, a film-spec sheet — and get a written read on whether it holds up, and what would close the gap.
See servicesAssessment
Your held documents for this step graded against the standard’s rubric — a readiness matrix of what passes, what’s a gap, and what’s at risk.
See assessmentsProgram
A complete, buy-and-go document system for the standard this step has to satisfy — download it all, or follow the guided build. No meetings required.
Explore programsConsulting
When the productized options don’t fit — a scoped, senior review of your situation and a written path, by inquiry.
Start a conversation