A useful cartoning-machine business case starts with the current packing process, then separates measurable cash effects from operational benefits that still need evidence.
A cartoning-machine business case should compare the current approved process with the proposed future process over the same production demand. It should include the complete project investment, the labour and operating effects that can be measured, the risks and assumptions, and the evidence required before a saving is treated as bankable.
Begin with a dated baseline. Record the products and carton formats, good packs produced, direct labour assigned, overtime, planned hours, actual operating hours, changeovers, material losses, quality rejects, rework and downtime attributable to the cartoning task. Separate the cartoning operation from filling, capping, labelling and downstream constraints so the proposal does not claim a line-wide benefit that the cartoner cannot create on its own.
The objective is not to produce the shortest payback number. It is to show which value drivers remain valid when volume, staffing, format mix or project scope changes.
| Investment area | Questions to resolve |
|---|---|
| Cartoning equipment | Which infeed, magazine, erection, loading, closure, coding, inspection and reject functions are included? |
| Format scope | Which launch formats, change parts, recipes and trial materials are included, and which future formats remain untested? |
| Line integration | Who supplies conveyors, accumulation, guarding interfaces, controls, data, upstream/downstream changes and site services? |
| Site and project work | Include surveys, design, installation, lifting, electrical and pneumatic connections, commissioning, FAT/SAT support and production cover. |
| Ownership | Include training, documentation, planned maintenance, initial spares, format storage and any recurring support or consumable requirement. |
| Contingency and change | State the allowance for unresolved materials, late design changes, additional tests and retained-line modifications. |
Use the cartoning machine cost guide to compare proposal scope before transferring a figure into the business case. A low equipment price can become a high project cost when integration, format tooling or acceptance responsibilities are omitted.
A benefit should be counted only when the proposed cartoning process can cause it, the measurement method is defined and the business can realise the value. Labour released from manual packing is not automatically a cash saving if the same people remain required elsewhere on the line or are retained for inspection, replenishment and fault recovery.
Compare paid hours for loading, carton handling, quality checks, rework, supervision and cover. State which work remains after automation.
Value additional good output only where filling, upstream presentation, downstream handling and market demand can support it.
Use recorded damage, wrong-component, code, closure and rework data. Do not assign a saving until the proposed control can address the cause.
Ergonomic improvement, traceability, capacity headroom and reduced dependence on scarce labour may matter even when they are not converted into cash.
Use a sensitivity table for low, expected and high volume rather than a single perfect scenario. Include the cost of changeovers, planned maintenance, format parts, rejects during start-up and the remaining manual tasks.
A simple payback estimate divides the complete project investment by the annual net cash benefit. It is useful for an initial comparison, but it does not account for the time value of money or benefits and costs after the payback point. The finance team should confirm tax, depreciation, funding, discount rate and whether net present value or another investment method is required.
| Line | Calculation | Evidence needed |
|---|---|---|
| Complete investment | Equipment + integration + site work + launch formats + acceptance + initial ownership costs | Like-for-like supplier scope and internal project budget. |
| Annual measurable benefit | Realised labour + contribution from additional saleable output + evidenced quality/rework saving | Current baseline, future operating model and demand assumption. |
| Annual incremental cost | Maintenance + support + energy + consumables + added technical work + financing effects as required | Supplier information and internal finance/engineering assumptions. |
| Annual net cash benefit | Annual measurable benefit − annual incremental cost | Approved sensitivity case. |
| Simple payback period | Complete investment ÷ annual net cash benefit | Use only when annual net cash benefit is positive and assumptions are explicit. |
The Automate UK packaging machinery pre-investment checklist provides a broader planning reference. ACCA explains that payback is one of several investment-appraisal methods and distinguishes it from discounted cash-flow methods such as net present value in its investment appraisal guidance.
The sample-trial guide, FAT/SAT guide and specification checklist turn the financial assumptions into testable project evidence.
Provide current labour, products, cartons, output demand, available space and the required automation boundary so the machinery scope can be reviewed before a financial case is finalised.
Cartoning-machine return on investment compares the value created by the implemented project with the investment and ongoing costs needed to achieve it. The calculation should use realised labour, output, quality and operating effects rather than a theoretical machine speed or an assumption that every manual task disappears.
There is no responsible universal payback period for a cartoner. The result depends on project investment, production demand, labour that can genuinely be redeployed or removed, remaining manual tasks, format mix, integration cost, operating efficiency and the value of additional saleable output. Use company-approved investment criteria.
Count labour as a cash saving only when the future staffing model shows how paid hours will change. Operators may still replenish materials, complete checks, clear faults, manage changeovers and support adjacent equipment. Redeployment can be valuable, but it should be described separately when it does not reduce cash cost.
Include a quality benefit when the current loss is measured, the proposed cartoning process addresses the cause and the financial effect can be realised. Keep presentation consistency, traceability or risk reduction as a separate benefit where a reliable cash value cannot be supported.
Use product- and format-level demand, good output, direct labour, changeover time, downtime, rejects, rework, overtime, current equipment cost and full project scope. Record who owns each input and test low, expected and high cases so the decision is not dependent on one optimistic operating assumption.
Send the products, carton formats, current labour, production demand and line layout for a project-specific discussion.