The ROI question is really a cost-per-unit question, because the machine pays back through the units it produces, not through its price tag. The formula is simple: total annual cost divided by annual output gives the cost per unit, and the saving per unit against the old method times the annual volume gives the payback. A double wire pocket spring machine such as the IF-P130-2 replaces manual coiling and assembly labor, a computerized quilting machine such as the IF-Q-1200 replaces the manual pattern work, and a roll packing machine such as the IF-CR8 cuts the packing labor at the end of the line, so the per-unit formula is the common scale that compares them. Pair the ROI sheet with a complete mattress machinery solution and use the mattress production knowledge library to keep the calculation repeatable.
The mistake that kills most ROI calculations is comparing the machine price with a vague idea of the saving. The machine does not pay back by existing; it pays back through the units it produces at a lower cost than the method it replaces. Every cost must therefore be expressed in the same unit as the output: cost per mattress, or per coil, or per panel, depending on what the machine produces.
The per-unit number turns a large capital purchase into a number the factory can check every month. When the machine produces the planned volume and the running costs stay inside the budget, the cost per unit comes out as calculated and the payback lands on schedule. When the volume is lower or the running costs higher, the same formula shows the drift early, instead of discovering it years later.
The capital layer is the delivered price of the machine, which means the machine price plus shipping, installation, foundation work and operator training. This is the number that appears on the invoice, and it belongs in the ROI as an annual figure, not as a lump sum. The service life is the number of years the machine is expected to run at the planned volume before major rebuilding.
The service life differs by machine type. A pocket spring coiler and a quilting machine are heavy production machines that commonly run for eight to ten years, while a packing machine with more moving parts and film sealing elements may run on a shorter life. Use the manufacturer guidance and the factory maintenance record, and keep the same life for both machines in a comparison so the sheet stays fair.
The running layer is the money the machine consumes for every unit it produces. Labor is the operator time per unit multiplied by the hourly cost; energy is the machine draw multiplied by the operating time and the electricity price; consumables are the thread, film, adhesive and needles that each unit uses. All three are measured per unit so they can be added to the capital share.
The running layer is where the machine earns its payback, because it is the layer that differs most between the old method and the new machine. A manual process carries high labor per unit, and the machine replaces part of that labor with energy and consumables. The saving per unit is the old cost per unit minus the new cost per unit, and that saving multiplied by the annual volume is the annual payback of the machine.
The support layer is the money the machine costs after it is installed: maintenance and spare parts, the downtime it causes, the operator training and the consumables that wear with use. Buyers who skip this layer overstate the ROI, because the maintenance allowance alone typically runs several percent of the machine price per year.
Build the support allowance as an annual figure and divide it by the annual output. A maintenance and spare parts budget of three thousand per year on a machine that produces twenty thousand units adds fifteen cents per unit. The table shows how the allowance grows with the machine value and how it flows into the per-unit total, so the final number is a full ownership cost, not a purchase price.
The full sheet combines the three layers into one number. The annual total is the capital share plus the running cost at the planned volume plus the support allowance, and the cost per unit is that total divided by the annual output. The payback is then the saving per unit against the old method, multiplied by the annual volume, divided into the delivered price.
The table below shows a worked example for a pocket spring coiler at a twenty thousand unit factory. The annual cost is about thirty-seven thousand, the cost per unit is about one dollar and eighty-five cents, and the saving against the manual method of one dollar and thirty-five cents per unit gives an annual saving of twenty-seven thousand, which pays the eighty-five thousand delivered price back in roughly thirty-one months. Every factory replaces the sample numbers with its own.
The comparison only works when every machine is measured with the same inputs. Use the same labor cost, the same energy price, the same service life convention and the same maintenance allowance, and the cost per unit becomes a fair scale. A machine that costs more per unit at your volume is the worse buy even if its price tag is lower, and the reverse is also true.
The practical habit is to keep the ROI sheet as a living document. Update the volume every quarter, the labor cost when wages change and the maintenance allowance from the real record, and the sheet will show when a machine stops paying and when a new one starts to make sense. The same sheet works for a single coiler, a full quilting station or a roll packing upgrade, because the unit is always the output.
Send us the machine price, your planned volume, the labor cost and the electricity price, and our team can run the per-unit cost model and the payback for the machine you are considering.
