At full published speed, 30 seconds of feeding downtime equals 250 sheets of theoretical feed capacity. That is why a prefeeder should not be judged as “peripheral equipment”. On a modern corrugated converting line, it can decide whether rated speed becomes real output.
500 sheets/minute
30 seconds of downtime = 250 sheets of theoretical feed opportunity
10 minutes = 5,000 sheets
The fastest converting machine in the plant still cannot produce while it is waiting for board.
Why prefeeders matter more than their name suggests
A prefeeder sits before the flexo folder gluer, rotary die-cutter or other converting machine. Its job is simple to describe and difficult to execute well: receive a stack of corrugated board, centre it, separate or turn bundles where required, create a stable shingled stream and keep the downstream machine supplied during stack changes.
The value is not “another machine”. The value is continuity.
For a production manager, feeding problems appear as small losses: a pile that needs correction, a hopper that runs short, warped sheets that need intervention, a slow stack change, a restart after a disturbance. Each event may last seconds. Across a shift, those seconds become minutes — and minutes become lost output.
FEFCO gives this discussion an independent benchmark. Its technical specification TS 1201 defines OEE for corrugated converting as availability × performance × quality and describes OEE above 85% as “world class” under standard production conditions.
A prefeeder directly touches the first two parts of that equation: availability and performance.
From Favalessa to Emmepi: how the prefeeder story evolved
Favalessa was founded in Italy in 1970 and built its reputation around peripheral equipment for corrugated converting, including prefeeders. Emmepi dates its acquisition of Favalessa to 2015; Favalessa Systems was established in 2016 after Emmepi acquired 70% of the historic business. In 2025, Emmepi completed the acquisition of the remaining shares and integrated Favalessa Systems as its Peripheral Equipment Division.
The important point is continuity rather than a single launch date: the prefeeder technology did not suddenly appear as a new Emmepi product. It grew out of decades of specialised peripheral-equipment engineering and was later folded into a broader automation platform covering material flow before and after the converting machine.
Illustrative example: what does 12 minutes cost?
Emmepi publishes speeds of up to 500 sheets per minute for suitable single-wall work on its current Revolver, Minirevolver and Pack Feeder families.
At 500 sheets/minute:
- 30 seconds = 250 sheets
- 1 minute = 500 sheets
- 10 minutes = 5,000 sheets
Now use a more conservative production example.
If a line actually runs at 320 sheets/minute and loses 12 minutes per shift to feeding-related stops, that represents 3,840 sheets of theoretical capacity.
If the plant’s contribution margin is €0.10 per converted sheet, the theoretical contribution opportunity is €384 per shift — or €96,000 across 250 operating days.
This is not an industry benchmark and it is not a claimed Emmepi customer saving. It is a simple plant-level calculation:
Feeding loss per shift = feeding-related downtime × actual line speed × contribution margin per converted sheet.
The useful number is not our €96,000 example. It is the number your own production data gives you.
What changes when feeding is stabilised?
| Without stable prefeeding | With a well-integrated prefeeder |
|---|---|
| More operator intervention at the infeed | Controlled, continuous shingled feeding |
| Greater risk of hopper starvation during stack changes | Automated stack handling |
| More sensitivity to poorly aligned or difficult stacks | Less manual work around the machine infeed |
| Paid-for machine speed that cannot always be used | Better chance of maintaining line speed through stack changes |
The key difference is not simply automation. Stable prefeeding is about protecting line continuity and reducing avoidable interruptions before the converting machine.
None of these benefits should be assumed from a brochure. They have to be tested with the board, formats, line speed and machine interfaces of the actual plant.
Three Emmepi prefeeders — three different jobs
| Model | Best fit | Published speed | Key limits / feature |
|---|---|---|---|
| Revolver | Top print, medium and large formats | Up to 500 sheets/min | Up to 3,200 × 1,600 mm; stack up to 2,000 mm; vertical lift |
| Minirevolver | Top print, smaller formats | Up to 500 sheets/min | Up to 1,850 × 800 mm; stack up to 1,800 mm; stack weight up to 1,300 kg |
| Pack Feeder | Bottom print and jumbo | Up to 500 sheets/min | Up to 5,500 × 2,500 mm; stack up to 2,200 mm |
The right Emmepi configuration depends on print orientation, sheet format, stack height and the actual production mix of the plant — not on maximum speed alone.
All three families use Siemens PLC control and are designed for automatic synchronisation and remote assistance.
Why Emmepi is worth a serious look — and where to be careful
Emmepi’s strongest argument is not that it is the only high-speed prefeeder supplier. It is not.
Alliance offers hydraulic, electric and digital prefeeder architectures for corrugated converting. Dücker offers top- and bottom-print solutions and publishes speeds up to 30,000 sheets per hour on its DLF/DPF family. The market has credible alternatives.
That is important because it changes the buying question from “Who has the biggest number?” to “Which architecture removes the losses in our plant?”
Emmepi has several clear strengths.
First, range. Revolver, Minirevolver and Pack Feeder cover top-print, bottom-print, smaller formats and jumbo applications.
Second, vertical lifting. Where floor space is expensive, shortening the feeding zone can matter almost as much as increasing speed.
Third, integration. Emmepi is not only a prefeeder supplier; its wider portfolio includes conveyors, WIP, palletising, strapping, wrapping and finished-goods handling. In 2025, Emmepi completed the acquisition of Favalessa Systems and centralised its Peripheral Equipment Division in a new 9,000 m² facility in Pieve di Soligo, Italy.
Fourth, a real integrated-line reference. At Package-In in the UK, ThePackagingPortal documented a line beginning with a Favalessa Revolver prefeeder and continuing through Emmepi downstream handling to palletising and final strapping, linked by one Emmepi software system.
But buyers should also keep the limits in view.
The 500 sheets/minute figure is an “up to” specification for suitable board and formats. Actual output depends on flute, sheet size, board condition, print orientation, downstream machine and the quality of the integration.
A Siemens-based control architecture can be an advantage, but retrofit projects still need interface checks with the existing converting line, safety system and plant data architecture.
And no public independent ranking proves that Emmepi is the world’s fastest or most popular prefeeder brand. That claim is unnecessary. The more useful question is whether its architecture fits the plant better than the alternatives.
The one test we would insist on
Run the prefeeder on your worst corrugated board at the speed you actually expect to sell.
Not the easiest flute.
Not the straightest sheets.
Not a demonstration stack prepared specially for the test.
Use the material that gives your operators problems today. Then watch the stack change, the shingle, the alignment, the first and last sheets, operator intervention and recovery after a disturbance.
That test tells you more than a headline speed.
6 questions before buying a prefeeder
1. What is our real average line speed?
Do not size the decision only around nameplate speed.
2. How many minutes per shift are really feeding-related?
Separate stack-change losses, pile alignment, warped-board interventions and feeder faults from downtime caused elsewhere.
3. Can it run our worst board?
Demand a trial with difficult material, not only perfect sheets.
4. What happens between the last sheet of one stack and the first sheet of the next?
This is where “non-stop” feeding becomes real or theoretical.
5. How will it communicate with the rest of the line?
Speed synchronisation, recipes, diagnostics, safety signals and remote service should be resolved before commissioning.
6. Who supports the machine five years from now?
Spare parts, remote access, service response and installed-base experience can matter more over a decade than a small difference in purchase price.
The fastest prefeeder will not save a badly integrated line.
That is the central point.
Up to 500 sheets per minute is impressive. Stacks up to 2.2 m and formats up to 5.5 m are impressive too.
But Emmepi’s more interesting proposition is the combination of high-speed feeding, vertical-lift architecture, broad format coverage and the ability to connect the prefeeder with the rest of the material flow.
A well-integrated prefeeder does something more valuable than win a speed comparison.
It stops a fast converting machine from waiting.
So the most important number in your plant may not be 500 sheets per minute.
It may be the number of feeding-related minutes you lost today.
Sources
FEFCO — OEE for corrugated converting equipment
Emmepi Group — Favalessa Systems integration
Alliance Machine Systems — Prefeeders
ThePackagingPortal — Package-In installation
corruga.expert
