How to Choose the Right Interroll Conveyor & Sorter System: 3 Scenarios From a Procurement Manager

If you've been searching for "interroll," "conveyor interroll," or "interroll sorter" to figure out which system fits your operation — you're in the right place. But I'm going to give you an answer you probably didn't expect: there's no single right answer.

What makes sense for a 400,000-square-foot parcel hub is overkill for a 30,000-square-foot regional DC. And the modular conveyor that's perfect for that regional DC will be the wrong call if you're moving pallets all day.

Over the past six years of tracking every invoice, maintenance ticket, and hour of downtime across two facilities, I've built a TCO spreadsheet that's honestly too complicated for my own good (note to self: I really should simplify it before the next annual budget cycle). What it has taught me is that the right Interroll system depends entirely on which of three scenarios you're in. Let's walk through them.

Scenario 1: High-Volume, High-Mix Parcel Operations

If you're processing 10,000+ units a day across thousands of SKUs, you're in sorter territory. An automated Interroll sorter — shoe or cross-belt — becomes a financial decision, not a nice-to-have.

Here's the math I ran for our own operation in 2023. Manual sorting cost us about $115,000 a year in direct labor: 19 part-time sorters at an average of $14.50/hour, including benefits, overtime, and turnover rehiring. The automated sorter option — financing, maintenance contract, energy, spare parts — worked out to roughly $80,000 a year. That's a $35,000 annual swing, and it doesn't even count the reduction in mis-sorted parcels.

Sorter accuracy matters more than most people realize. A manual operation runs maybe 92-96% sort accuracy on a good day. A properly configured Interroll cross-belt sorter does better — significantly better. I don't have hard data on industry-wide mis-sort rates, but based on our audited returns, our mis-sort-related costs dropped by about 61% in the first year after the sorter went live. At scale, that alone is a six-figure line item.

It's tempting to think you can just compare equipment quotes and call it a day. That's the oversimplification that gets companies into trouble. The real comparison is total operating cost over five years. In high-volume, high-mix operations, the sorter almost always wins — not because automation is trendy, but because the labor math is brutal.

A few specifics if you're in this scenario:

• Ask about induction and merge integration. We underestimated this on our first quote. The sorter itself was reasonable; the controls, merge lines, and induction stations added 22% to the project cost.
• Consider cross-belt vs. shoe carefully. Cross-belt handles more SKU variety with higher accuracy. Shoe sorters are faster on flat parcels. There's no universal winner — it depends on your mix.
• Keep a stock of wear parts. A downed sorter in peak season is catastrophic. We keep a small inventory of the parts that wear most — sensors, rollers, and belts — and it's saved us twice already.

There's something satisfying about watching the payback calculation finally work out. After all the spreadsheet iterations, our ROI period landed at 2.3 years. After that, the sorter is basically paid for — and every year after is pure savings.

Scenario 2: Low-to-Mid Volume, Space-Constrained Facilities

Now let's talk about the opposite situation — the one where automation doesn't win.

If you're moving 1,000 to 3,000 units a day and you don't have the floor space or capital budget for a full sorter, buying one anyway is a mistake. I've seen it happen: companies install a $300,000 sorter in a single-shift facility and watch it sit idle 60% of the time. (Ugh. That's hard to watch when you've done the math.)

For this scenario, an Interroll modular conveyor line with 24V drum motors is honestly the better investment. Here's why:

• Plug-and-play modularity. Sections bolt together and you can reconfigure the layout over a weekend. Try doing that with a fixed sorter.
• Lower installation cost. The EC310 drum motors don't need air lines or complex gearbox alignment. Our regional facility installed a modular line in three days with two technicians.
• Energy efficiency. The 24V roller drive systems consume a fraction of what traditional gear motor setups use, and maintenance is minimal because there's no gearbox to service.

Our total investment for the modular line was about $42,000, including 40 feet of conveyor, drives, and controls. Payback came in at 14 months, mostly through eliminating manual transfer labor between pack stations.

I don't have hard data on industry-wide energy savings for 24V vs. traditional drives — but based on our electricity bills, the drop was noticeable in the first quarter. And when Henry, our maintenance lead, said "we'd spend more time on gearbox oil changes than on anything else," that sealed it for us. (Henry's been maintaining conveyors for 15 years. I listen when he talks.)

One caveat: this worked for us because we're a mid-size B2B operation with predictable order patterns. If you're a seasonal business with big demand spikes, you might need more burst capacity than a modular line provides. Your mileage may vary.

Scenario 3: Heavy Pallet Movement

This is where I need to be straight with you — because it connects to a deeper point about professional boundaries.

If your primary operation is moving heavy pallets — 1,500 pounds and up — through a high-density racking environment, an Interroll sorter or modular conveyor is probably not what you need.

Interroll makes pallet-moving equipment, and their lighter pallet handling works for specific sub-processes. But their real strength is in unit handling and carton/parcel sortation. For heavy pallet flow at high throughput, a specialized heavy-materials-handling vendor is often a better fit.

And honestly? That's okay. The vendor who says "this isn't our strength — here's who does it better" earns my trust for everything else. I'd rather work with a specialist who knows their limits than a generalist who overpromises and underdelivers. That's held true in every category I've bought — from conveyor systems to ERP software, incidentally.

"I'd rather work with a specialist who knows their limits than a generalist who overpromises." — that's the procurement version of common sense, but you'd be surprised how rare it is.

If you're in the lighter range — empty pallets, transfer decks, or loads under about 1,200 kg — Interroll's RollerDrive pallet mover platform can be a legitimate option. But know where the line is. That boundary awareness is what makes both good vendors and good buyers.

How to Tell Which Scenario You're In

Still not sure? Here's the quick diagnostic we use before any conveyor investment:

1. What's your daily volume? Over 10,000 units → Scenario 1. Between 1,000 and 3,000 → Scenario 2. Under 1,000 → you probably just need workstation conveyance, not a major capital project.
2. What's your average payload? Parcels and cartons under 150 lbs → Interroll is in its element. Pallets over 1,500 lbs → start with specialized heavy equipment, not a parcel sorter.
3. What's your throughput shape? Flat and predictable → Scenario 2. Sharp seasonal peaks → you may need sorter-grade burst capacity, at least during windows. Running TCO on both makes the decision concrete.
4. What does your labor market look like? This is the variable that surprises people. We automated in Scenario 1 not because we loved automation, but because we couldn't staff the manual stations. In a tight labor market, the TCO math shifts hard.

And one practical tip: ask about lead times before you commit. Standard Interroll modular components were 4–6 weeks for us; custom sorter configurations ran 10–12 weeks. If you need equipment in stock or fast, that answer can make or break your timeline.

One thing I'd insist on regardless of scenario: make sure your integrator follows ASME B20.1 conveyor safety standards. It's the baseline for guard placement, emergency stops, and maintenance access — and it's much harder to retrofit than it is to get right upfront.

Final Thought: Run the Numbers, Then Decide

Look, I can't tell you which Interroll system to buy without seeing your numbers. And on a completely unrelated note, I also can't tell you where to watch From the World of John Wick — that is genuinely outside my lane.

But here's what I can tell you after six years and $180,000 in tracked purchases: run the total cost of ownership, not the sticker price. Know your daily volume, your payload, and your labor market. Then pick the scenario that matches your reality — not the one that looks most impressive in the brochure.

The right answer isn't the biggest sorter or the longest conveyor. It's the system whose annual operating cost you can defend when the CFO asks. In the end, that's the only answer that matters.