Which criteria are decisive for calculating ROI and payback period for a new spice mixer?
Calculating the return on investment and payback period for a new spice mixer requires a joint assessment of investment, operating costs, process performance, product quality and risk. What matters is not only what the mixer costs, but what economic benefit it generates over its planned service life compared with the previous solution.
With spice blends, besides energy and maintenance, product losses, residual discharge, cleaning duration, allergen control, dust extraction, mixing quality and flexibility with recipe changes are particularly decisive. Even small losses can be economically relevant with high-value spices, extracts or additives.
Terms and calculation logic
Return on investment describes the profitability of an investment within a defined period. For a simplified annual view, ROI is calculated by dividing the annual net benefit by the total investment and multiplying the result by 100. The annual net benefit results from savings and additional contribution margins, less all additional ongoing costs.
The payback period describes when the initial investment is covered by the cumulated net cash flows. If the annual net cash flow remains approximately constant over the entire period under review, the payback period results from the total investment divided by the annual net cash flow.
With strongly fluctuating utilisation, energy prices, raw-material prices or sales volumes, payback should be calculated using a multi-year cash-flow plan. For larger investments, the net present value method and the internal rate of return are better suited, because they take into account the time value of money, residual values and different payment timings.
Investment costs
The total investment covers far more than the mixer's purchase price. To be captured are the mixer, drive, control system, sensors, safety equipment and required peripherals. These include, for example, feeding, dosing, extraction, filters, weighing systems, conveying technology, discharge, cleaning equipment and, where applicable, ATEX equipment.
Added to this are costs for engineering, assembly, electrical installation, utility connections, foundations, structural modifications, commissioning, acceptance and training. With spice blends, investments in allergen management, dust protection, hygiene concepts, metal detection or documented cleaning procedures can also be necessary.
Ongoing operating costs
Ongoing operating costs determine the annual net cash flow. These include energy, personnel, cleaning, maintenance, spare parts, consumables, laboratory analysis, disposal and unplanned downtime.
Energy consumption should be compared as energy per batch or per tonne of saleable product. Besides the electrical power of the mixing drive, extraction, compressed air, temperature control, vacuum, filters and, where applicable, inert-gas supply must also be included.
Personnel effort covers not only operation during mixing. Feeding, dosing, cleaning, sampling, documentation, changeover and fault clearance must also be assessed. Automated dosing, recipe management, weighed raw-material addition and clear operating concepts can reduce the effort per batch.
Maintenance costs arise from seals, bearings, gearboxes, mixing tools, discharge elements, sensors and filters. Not only the cost of the parts is important, but also the duration of planned maintenance, the availability of critical spare parts, and the consequences of unplanned failures.
Throughput and overall equipment effectiveness
Cost-effectiveness is strongly determined by the plant's productively usable time. For the calculation, not only mixing times are relevant, but the entire batch time. This comprises feeding, dosing, mixing, discharging, cleaning, drying, sampling, laboratory release and recipe change.
Higher overall equipment effectiveness can enable more saleable product per shift, without requiring the purchase of an additional mixing plant. For the assessment, availability, performance rate and quality rate should be captured separately.
Availability describes the proportion of planned production time during which the plant actually runs. Performance rate describes whether the planned throughput is achieved. Quality rate captures the proportion of flawless and saleable batches.
Product quality and raw-material yield
Mixing quality has a direct economic impact. An even distribution of spices, salts, sugar, herbs, flavourings or functional additives reduces failed batches, rework and complaints. It can also enable more precise dosing of expensive ingredients and thereby reduce so-called give-away.
With spice blends, residual discharge is particularly relevant. Product remaining in the mixing chamber means a loss of value and can lead to cross-contamination in subsequent batches. Extensive residual discharge reduces raw-material losses, cleaning effort and the risk of allergens, colourants or intense flavours passing into subsequent products.
The savings from reduced give-away or smaller residual quantities should be calculated using realistic raw-material values. Particularly with small batches and high-value recipes, this item can have a greater economic effect than a small saving in electrical energy.
Allergen management and cross-contamination
With spice blends, recipe changes often have to take place under strict requirements for allergen and cross-contamination control. Critical substances can, for example, be mustard, celery, sesame, gluten-containing cereals, milk constituents, soy or nuts. Colourants, intense flavourings and pungent components such as chilli or pepper can also cause unwanted carry-over.
A hygienic mixer with good access, low residual quantity and a reproducible cleaning strategy can reduce the risk of failed batches, quarantine periods, special cleaning and production interruptions. This risk reduction should be included in the cost-effectiveness calculation, for example via the expected costs of avoided failed batches or reduced cleaning times.
Additional revenue and strategic benefit
A new spice mixer can not only lower costs, it can also enable additional revenue. This includes higher production capacity, shorter delivery times, the production of smaller special batches, a broader product range and new spice blends with higher margins.
The ability to process low-allergen, allergen-free or particularly pure product lines economically can also have a strategic benefit. This benefit should only be included as additional revenue if sales volume, selling price and contribution margin are realistically secured.
Practical calculation approach
A robust calculation begins with a comparison between the current situation and the target situation. First, the total investment is determined. The annual savings and additional revenue are then calculated. All additional ongoing costs of the new system are then deducted from this.
The annual net cash flow can, for example, be made up of saved personnel time, shorter cleaning times, less product loss, less scrap, lower give-away, lower maintenance and energy costs, fewer unplanned downtimes, and additional contribution margin from higher throughput or new products.
The results should be considered in at least three scenarios. A conservative scenario assumes low utilisation and limited savings. A realistic scenario is based on the most probable assumptions. An optimistic scenario shows the potential with high utilisation and full use of the process advantages.
Investing in a new spice mixer is economically particularly attractive if it produces several effects simultaneously: high and reproducible mixing quality, less give-away, low residual quantities, short product changes, reliable allergen management, low cleaning times, high availability and additional production capacity.
How amixon® assesses energy efficiency, TCO, ROI and payback of a spice mixer
The cost-effectiveness of a new spice mixer is not decided by the purchase price alone. Relevant are investment, energy and utility consumption, product loss, cleaning and changeover times, maintenance, spare parts, personnel effort, downtime risks and the additional benefit from higher capacity, better product quality or new recipes.
amixon® therefore assesses cost-effectiveness as an overall process. The focus is on factors that can be influenced through design and process engineering: a product-appropriate energy input, gentle product treatment, high mixing quality, extensive residual discharge, good cleanability, short changeover times, plannable maintenance and long-term usability.
For the ROI and payback calculation, the total investment is compared with the annual economic benefit. In addition to the mixer, the total investment includes feeding, dosing, extraction, filters, weighing systems, control system, cleaning equipment, assembly, commissioning, training and, where applicable, ATEX or hygiene technology. The annual net cash flow results from savings and additional revenue less the additional operating costs.
Energy consumption matched to the mixing task
General figures for energy consumption per tonne of product are of only limited value for spice mixers. The real energy demand depends on the recipe, batch size, fill level, bulk density, mixing time, the proportion of very fine components and the required energy input.
Depending on the design and mixing task, amixon® mixers operate at low circumferential speeds. The low-speed mode of operation can reduce friction, impact stress and dynamic loads. This is particularly advantageous for tea, herbs, fragile leaves, sensitive granulates and structured spice components. The goal is not the lowest motor power, but achieving the required mixing quality with the lowest technically sensible energy input.
The Gyraton® silo mixer GM is designed for large-volume batches of up to approximately 100 cubic metres. It can be used for the homogenisation of large quantities of spices, tea, herbs or coffee. The mixing principle enables the movement of large product quantities with a comparatively low installed drive power. Whether this yields an economic advantage depends on the product, fill level, mixing time and production concept.
Product loss and raw-material yield
With spice blends, even small product losses can be economically relevant. This applies particularly to high-value spices, extracts, flavourings, herbs, functional additives or recipes with small batches. Residual quantities in the mixer cause not only a direct raw-material loss. They can also affect subsequent batches and increase the risk of cross-contamination.
The amixon® AM and KS series are designed for extensive residual discharge. ComDisc® discharge tools support the removal of residual product from the mixing chamber. The discharge rate actually achievable always depends on the product. Moisture, particle shape, leaf content, cohesion, bulk density and adhesion tendency influence the remaining residual quantity.
Extensive residual discharge can reduce so-called give-away, improve raw-material yield and shorten cleaning time. This can significantly influence a new mixer's annual net benefit and thereby shorten the payback period.
Cleaning, allergen control and changeover times
With spices, tea and herbs, recipe changes are often associated with stringent requirements for cleaning and cross-contamination control. Allergens such as mustard, celery, sesame, gluten-containing cereals, milk constituents, soy or nuts must not pass uncontrolled into subsequent products. Intense flavourings, colourants, chilli, pepper or garlic can also cause unwanted carry-over.
Mixing chambers with minimal dead space, readily accessible product-contact surfaces and suitable discharge elements support dry or wet cleaning. amixon® can equip mixing plants with programmable target-jet cleaning nozzles. These clean the mixing chamber, mixing tool and discharge areas specifically in defined sequences. This can make cleaning more reproducible and reduce manual effort.
After wet cleaning, a wet mixing chamber can be dried with a coordinated air or inert-gas flow. A short drying time reduces downtime and increases the plant's productively usable time. The achievable cleaning and drying time must be assessed for the product, recipe, cleaning medium and release criteria.
Maintenance, availability and service life
amixon® mixing technology is designed for robust construction, low dynamic loads and good accessibility for inspection and cleaning. The mixing tool is supported exclusively at the top. This means a product-contacted lower shaft passage can be dispensed with. This reduces a potentially maintenance-intensive area in the mixing chamber.
Low-speed operation, low-wear construction and long-term available design documentation can reduce maintenance effort and spare-parts risks. Selected wear parts can already be provided with the initial delivery. amixon®'s design, manufacturing and service support spare-parts needs, conversions and modernisation.
Throughput, OEE and additional revenue
The cost-effectiveness of a spice mixer is determined by the total batch time. This comprises feeding, dosing, mixing, discharging, cleaning, drying, sampling and recipe change. A short mixing time alone is not a sufficient economic advantage if discharge or cleaning take a long time.
High plant availability, short product changes and reproducible mixing quality can improve overall equipment effectiveness. This makes more saleable batches per shift possible without requiring an additional mixing plant. In addition, a flexible mixer can facilitate the economical production of smaller special batches, new spice blends or high-margin products.
Robust data instead of general catalogue values
A robust ROI and payback calculation should be based on documented trial data obtained with the original product. In the amixon® pilot plant, mixing time, power consumption, mixing quality, product protection, residual discharge, cleaning effort, drying time and changeover time can be assessed under realistic conditions.
The amixon® pilot plant at the Paderborn site has more than 30 test units in different sizes available. Additional pilot plants exist in Japan, India, Thailand, China, South Korea and the USA. The trials can be carried out with realistic fill levels, batch sizes and the intended temperature and pressure conditions.
The results are documented and form a basis for selecting the size, defining the process parameters and the cost-effectiveness calculation. Scale-up to the target size is carried out on the basis of the respective mixing task and, for critical recipes, should be confirmed through suitable trials.
An amixon® mixing plant can have a particularly positive effect on ROI when it produces several economic effects simultaneously: high and reproducible mixing quality, gentle processing, low residual quantities, less give-away, short cleaning and changeover times, reliable allergen management, high plant availability and additional production capacity.