Procurement teams still screen case erectors and case formers almost entirely on the sticker price. That habit quietly destroys the business case, because on a packaging line the invoice is the smallest number in a ten-year ledger. A 40 CPM automatic erector is a capital asset whose real cost is written in energy, glue, spare parts, maintenance labour and, above all, the cases you failed to pack while it was stopped.

This article builds a total cost of ownership model you can copy onto a spreadsheet in an afternoon. It breaks the cost into six components, shows a fully worked ten-year example at 30 CPM and two million cases a year, and explains why the purchase price typically covers only 35 to 45 per cent of what the machine truly costs. It also compares paying cash against finance lease and operating lease, and lists the PLC alarms that most often inflate the bill.

The Short Answer

On a realistic ten-year horizon the equipment purchase is roughly 35 to 45 per cent of total cost, not the headline number buyers defend in meetings. Consumables, energy, spare parts, maintenance labour and unplanned downtime make up the rest — and downtime alone can, in a poorly run plant, exceed the original invoice.

In the worked example below a 30 CPM erector priced at 180,000 USD plus 18,000 USD of installation spends ten years costing about 498,000 USD all-in. The glue, the electricity and the maintenance are predictable. The variable that breaks budgets is the 150,000 USD of lost output from stops, because every minute of downtime at 30 CPM is 900 cases that never ship.

The Six Components of TCO

A defensible TCO model has six lines, and they should be estimated every time a machine is quoted.

Equipment purchase. This is the capital cost of the erector or case former itself, delivered but not yet installed. For a 30 to 40 CPM automatic machine expect 120,000 to 220,000 USD depending on lanes, servo count and whether glue or tape is fitted. It is the anchor of the model but rarely the largest line over ten years.

Installation, commissioning and trial runs. Budget 8 to 15 per cent of the purchase price. That covers freight and rigging, electrical and pneumatic hook-up, two to three days of supplier startup, and the carton samples consumed proving squareness and seal strength. On a 180,000 USD machine that is 14,000 to 27,000 USD, almost always forgotten in the first quote.

Energy. A 30 CPM erector with a glue melter draws roughly 5 to 7 kW while running. At two shifts of eight hours, 250 days a year, that is about 24,000 kWh annually; at 0.12 USD per kWh the bill is close to 2,900 USD a year. It is small in absolute terms but it never stops, so over a decade it is a five-figure line.

Consumables. Hot-melt glue at 0.9 g per case and two million cases a year is 1,800 kg of adhesive. At a bulk price near 3.50 USD per kg that is 6,300 USD annually, or 63,000 USD across ten years — more than a third of the original machine price, spent on a tube of glue.

Spare parts and maintenance labour. Plan 3 to 5 per cent of purchase price per year in parts, plus the labour to fit them. At 12 USD per hour and four hours of planned maintenance a week, labour alone is 2,400 USD a year; with wear parts the line settles near 5,800 USD annually and 58,000 USD over the horizon.

Unplanned downtime loss. This is the silent multiplier. At 30 CPM a 30-minute stop is 900 cases of lost throughput. Value that at even a modest 0.30 USD contribution per case and a plant losing two hours a week to faults haemorrhages 15,000 USD a year — and in a busy contract packer the figure climbs past the machine’s invoice within the warranty period.

The Plain-Text Cost Model

Write the model as four arithmetic lines so any engineer can reproduce it. No special syntax is needed.

Annual total cost = capital amortisation + energy + consumables + maintenance & spares + downtime loss
Capital amortisation = equipment purchase ÷ expected service life (years)

Per-case cost = annual total cost ÷ annual case volume
10-year TCO (undiscounted) = purchase + installation + (annual total cost × 10)

Discounting is what separates a TCO model from a simple sum. Spend today is worth more than spend in year nine, so each future year is divided by (1 + r) raised to the year number, where r is the discount rate. Industrial buyers normally use 8 to 10 per cent; the worked example below uses 9 per cent. In a discounted model the purchase and installation dominate even more, because operating costs are pushed further into the future.

A Worked 10-Year Example

The following model uses a 30 CPM erector, 2,000,000 cases per year, electricity at 0.12 USD per kWh, glue at 0.9 g per case, and maintenance labour at 12 USD per hour. Figures are typical engineering values, not a quotation.

Discounted at 9 per cent the net present cost falls to about 390,000 USD, because most of the burden is operating spend spread across the decade. The per-case cost works out to roughly 0.024 USD — a number far more useful for a packaging bid than the sticker price ever was. The lesson is blunt: shaving 10,000 USD off the purchase saves 10,000 USD once, while cutting downtime by 20 per cent saves 30,000 USD over the life of the machine.

Cash, Finance Lease or Operating Lease

How the asset is financed changes the cash profile but not the physics, and the three routes suit different buyers.

Direct purchase puts 180,000 USD on the table on day one and the machine is yours to depreciate. Total finance cost is zero, so TCO is the lowest in nominal terms, and you keep the residual value at year ten. It is the right call when capital is cheap and the line runs two or more shifts, because the utilisation amortises the invoice fastest.

Finance lease typically asks 20 per cent down and spreads the balance over 36 monthly payments at around 7 per cent annual interest. On this machine that is roughly 36,000 USD upfront and about 4,500 USD a month, totalling close to 198,000 USD — a modest premium over cash that preserves working capital and keeps the cost inside the TCO envelope.

Operating lease rents the machine for 3,000 to 3,500 USD a month with maintenance included and no ownership at the end. Over ten years that nominalises to 360,000 to 420,000 USD, the highest headline, but it is off-balance-sheet, it bundles service, and it lets a contract packer swap to a faster model when a customer’s volume moves. For businesses whose case mix changes every season, that flexibility is worth more than the interest saving.

Machine Specification Envelope

The TCO model only holds if the machine is sized to the box. The envelope below is the working range our engineers quote against; outside it, change the machine class rather than forcing the adjustment.

Within that envelope a single machine protects its TCO, because the same capital serves the whole product range. A rigid-box or tri-seal duty that drifts outside these numbers is better served by a purpose-built former, which is why the high-volume twin-lane duty is matched to our Double-Head High-Speed Case Former rather than stretched from a standard erector.

OEE and the Real Cost of Stops

Total cost of ownership is just OEE turned inside out. Overall Equipment Effectiveness multiplies three ratios: availability, performance and quality. Availability is run time divided by planned time, performance is actual speed divided by nameplate speed, and quality is good cases divided by total cases. A line at 0.90 availability, 0.95 performance and 0.99 quality runs at 0.85 OEE — strong for packaging.

OEE = availability × performance × quality
Availability = run time ÷ planned production time

Changeover and faults attack availability first. Six changeovers a day at eight minutes each is 48 minutes of lost planned time; at 30 CPM that is 1,440 cases never made, repeating every shift. Cut changeover to under five minutes and the same day recovers roughly 540 cases of output with no extra capital — a direct subtraction from the downtime line in the TCO model. For lines packing more than 200 SKUs, a Single-Piece Carton Erector with recipe memory is the cheapest OEE gain available.

PLC Alarms That Inflate TCO

Most of the cost creep above comes from a handful of repeatable faults. The four alarms below drive the majority of unplanned stops on an erector, and each one has a cheap first response.

Keeping those alarms rare is routine discipline. Every shift: confirm glue is clean, the nozzle is not weeping, and suction cups are dust-free. Every week: purge the nozzle, verify vacuum at the pump, and check belt tension. Every month: torque the main drive belts, inspect the compression section for board dust, and verify squareness against a reference case. Every quarter: replace picking-head suction cups and clean or replace filters. Every year: re-tension the drive chain, replace the nozzle assembly, and calibrate temperature controllers against a reference probe. Lines that hold this rhythm typically keep availability above 98 per cent across three shifts.

Choosing for Your Line

The TCO math points the same way for most buyers. If you run one or two box sizes above a million cases a year, buy outright and protect availability with disciplined maintenance; the Three-Piece Carton Erector and the double-head former cover the high-volume and tray duties respectively. If your case count swings with the season, an operating lease with bundled service beats tying up capital in a machine you will outgrow.

Sizing the envelope early is the single highest-leverage step, and the detailed question list is answered in our FAQ. Getting the box range and CPM right before purchase is what keeps the downtime line — the one that actually exceeds the invoice — under control.

FAQ

Is the purchase price a good negotiation target?
Only up to a point. Saving 10,000 USD on the invoice is a one-time win, but the same effort spent cutting downtime or consumable grammage returns that sum every few years across the life of the machine.

Does discounting really change the decision?
At 9 per cent it shifts weight toward the purchase and away from operating spend, because future costs are worth less. It rarely flips a decision but it makes the per-case number honest, which matters when you bid packaging on a fixed price.

How much downtime is too much?
Anything above 3 per cent of planned time starts to erase the saving from a faster, cheaper machine. At 5 per cent you are paying for speed you cannot use.

Can an older machine still have low TCO?
Yes, if spares are cheap and availability stays above 95 per cent. The risk is the downtime line compounding as wear parts age, so model a rising maintenance curve after year six.

Ready to cut your cost per case? Send your carton specifications — length, width, height, flute grade, target cases per minute and annual volume — to [email protected] or WhatsApp +86 13681839278. Our engineers will return a TCO model and a machine sizing sheet within 24 hours, with no obligation.