Corrugated Converting Line TCO FAQ

Data: Total cost and value stream analysis account for the full set of costs a process generates across its life, rather than the purchase price of a single step.

Judgment: Compare converting lines on five-year cost rather than invoice price, because energy, maintenance, and changeover are the lines most often underestimated and they decide whether the line pays.

Source: Lean Enterprise Institute - Lean Lexicon: Total Cost and Value Stream (2023)

Data: The U.S. Department of Energy's Advanced Manufacturing Office publishes industrial energy management guidance and tools used to estimate motor and process energy use.

Judgment: Estimate energy from connected load and duty cycle rather than a nameplate figure, because line energy over five years is a large and controllable share of total cost of ownership.

Source: U.S. DOE AMO - Industrial Energy Management Resources (2023)

Data: TAPPI publishes converting reference material covering corrugated board production and converting operations.

Judgment: Write the comparison against the board grades and run lengths you actually produce, because a line that is efficient at one grade can be the worst choice at another.

Source: TAPPI - Corrugated Board and Converting Resources (2024)

What is included in the total cost of ownership of a converting line?

TCO includes capital and installation, energy, labor across all shifts, consumables such as glue, ink, and wire, tooling and dies, scheduled maintenance and spares, and the cost of scrap and downtime. Purchase price is usually the smallest of these over five years. Build the model per 1,000 boxes or per shift, so machines with different capacities can be compared fairly.

How do I compare two converting lines fairly?

Normalize both to cost per 1,000 boxes produced at your real mix, then run the same five-year horizon. Include the downtime difference, the changeover time, and the tooling cost per new SKU. A line that is 15% cheaper to buy but 20% slower to change over loses on any order book with frequent size changes. Compare at your mix, not at nameplate speed.

Which TCO line is most often underestimated?

Changeover time and downtime, because they do not appear on the invoice. A machine that takes an hour longer per size change, multiplied across a mixed order book, can erase the entire price advantage of a cheaper line within a year. Energy and scrap are close behind. Measure changeover and unplanned stops during acceptance, not after commissioning.

How do I estimate energy cost over five years?

Compare energy per 1,000 boxes rather than nameplate kilowatts, because two machines with identical connected load can differ widely in idle draw and in compressed-air demand. Ask for measured draw at production and standby, apply your tariff and running hours, and include air demand at the machine. That gap compounds over a five-year model.

What share of TCO does maintenance take?

Planned and unplanned maintenance typically accounts for 5 to 12 percent of five-year TCO, but unplanned failures cost far more than the parts because they stop the line. Ask for a spares price list with lead times and for the mean time between failures, then price the downtime of your own line against those figures.

How should I structure the purchase decision?

Define output as cost per 1,000 boxes at your real size mix, fill every cost block, measure the hidden lines such as changeover and setup scrap, normalize to five years at your volume, and instrument the line after start-up so the model updates with real numbers. Re-run the model whenever the order mix changes, because TCO is a living figure.