Injection moulding machine cost breakdown: the six line items
| Line item | What it covers | When you pay it |
|---|---|---|
| Machine | Clamp, injection unit, drive, controller, standard guarding | At purchase |
| Auxiliaries | Dryer, chiller or cooling tower, mould temperature controller, hopper loader, picker or robot, grinder | At purchase or soon after |
| Installation | Power cabling, power factor correction, water and air lines, unloading, levelling, commissioning, training | Before the first good part |
| Energy | Machine drive, barrel heating, chillers, compressed air, drying | Every month |
| Maintenance | Oil, filters, heater bands, thermocouples, seals, screw and barrel wear | Every year, rising with age |
| Downtime | Output lost to breakdowns, mould changes and waiting for spares | Every time the machine stops |
The table lists the six lines in the order you pay them, and only the first appears on the machine invoice. Auxiliaries and installation arrive before the first good part. Energy, maintenance and downtime keep arriving for as long as the machine runs. In the energy guide for injection moulders by ExxonMobil, AMI and Tangram Technology, ten-year energy cost exceeds purchase cost in almost every case, so the running lines need as much attention as the machine.
Key Takeaways
- Build the cost breakdown from six lines: machine, auxiliaries, installation, energy, maintenance and downtime.
- Energy over ten years usually outweighs the purchase, so a machine's base load matters as much as its specification.
- In Maharashtra, kVAh billing means a poor power factor raises the energy line without any extra output.
- Downtime is a cost line too: count it as lost output per hour, not as an inconvenience.
What sits outside the machine invoice?
Auxiliaries and installation sit outside it. A dryer, a chiller or cooling tower, a mould temperature controller, a hopper loader, a picker or robot and a grinder may all be needed before production. Installation adds cabling, power factor correction, water and air lines, levelling, commissioning and operator training.
Which auxiliaries you need depends on the material and the part. Hygroscopic resins such as PET, nylon and polycarbonate need drying before moulding, while general PP and HDPE parts often run without a dryer. Mould cooling decides whether you need a chiller or whether tower water will do. A sprue picker may be enough where parts drop by gravity, while stacking or insert loading needs a robot.
List these items against your own parts before you compare offers. Two offers for the same machine can differ only because one includes a dryer, a picker or commissioning that the other leaves for you to arrange.
Installation has its own checks. Confirm that your sanctioned load covers the machine's drive and heaters plus every auxiliary running at the same time, that the floor is level and strong enough for the machine and the mould, and that there is room and lifting gear to change moulds. A shortfall found after delivery is the most expensive way to discover it.
Why does energy dominate an injection moulding machine cost breakdown?
Because the machine draws power every hour it runs, and much of that power goes into base load rather than parts. The ExxonMobil, AMI and Tangram guide puts polymer processing at 66% of a typical plant's energy, with chillers at 11% and compressed air at 10%.
The same guide gives typical variable load of 0.9 to 1.6 kWh/kg of material processed. It also reports that a standard hydraulic machine's base load can be 75% or more of its total energy, against about 10 to 20% for all-electric and hybrid machines, where barrel heating is most of it. A high base load can also mean the machine is too large for the job.
Barrel heating alone is 10 to 25% of a machine's energy input, and the guide reports that insulating the barrel can cut that by up to 50%. Small items like this belong in the breakdown because they recur every hour.
In Maharashtra, the tariff structure adds a second layer. Under MSEDCL kVAh billing, demand charges are on kVA and energy charges on kVAh. MERC moved HT consumers and LT consumers above 20 kW to kVAh billing from 1 April 2020. Billed kVAh equals kWh divided by power factor, so at a power factor of 0.85, 15% of the power drawn does no useful work, and MSEDCL recommends capacitors or APFC panels. Tariffs themselves have changed after a MERC order dated 25 March 2026, so take rates from your latest bill.
What do maintenance and downtime add?
Maintenance adds oil, filters, heater bands, seals and, over time, screw and barrel wear. Downtime adds the output you lose each hour the machine stands. Both rise as a machine ages, and both are easier to control when they are measured rather than guessed.
PlasticsToday reports that idling machines draw 52% to 97.5% of full moulding energy, and that idle periods longer than 1.5 hours may be cheaper to switch off and restart. Rising energy on the same job can indicate screw or barrel wear, so a clamp-meter log taken at each service visit doubles as a wear check.
The guide adds two cheap levers. Compressed air leaks are typically 20 to 40% of the air a plant makes, and staff training can cut energy use by up to 20%. Neither needs new equipment, which is why they belong in the maintenance plan rather than the capital plan.
To put a figure on downtime, multiply the hours stopped by your output per hour and by the margin on each part. Our flat view: a cost breakdown that stops at the invoice is a purchase order, not a cost breakdown.
How should you build your own cost breakdown?
Start from your part, material and shifts, list every auxiliary and installation item against them, then estimate energy from kg per hour, your working hours and your latest bill. Add a maintenance allowance and a downtime figure, and compare offers line by line. Keep the breakdown as a living sheet: after three months of production, replace each estimate with the measured figure. See the injection moulding machine range to match machine types to your parts.
Frequently Asked Questions About Injection Moulding Machine Cost Breakdown
What is the largest running cost of an injection moulding machine?
Leaving material aside, energy is usually the largest. The ExxonMobil, AMI and Tangram energy guide reports that ten-year energy cost exceeds purchase cost in almost every case. Maintenance and downtime follow, and both tend to grow as the machine ages, so log them from the first month.
How can I estimate energy use before the machine is installed?
Multiply your planned throughput in kg per hour by your working hours, then by a kWh per kg figure. The energy guide gives 0.9 to 1.6 kWh/kg as a typical variable load. Divide by your expected power factor to get kVAh, and use the rate on your latest electricity bill.
Does power factor change my electricity bill in Maharashtra?
Yes, for consumers on kVAh billing. MSEDCL bills energy on kVAh, which equals kWh divided by power factor, so a lower power factor means more billed kVAh for the same work. At 0.85, about 15% of the power drawn does no useful work. Capacitors or an APFC panel help hold it up.
Which auxiliaries belong in the cost breakdown?
Include every item the part needs to run: dryer for hygroscopic resins, chiller or cooling tower, mould temperature controller, hopper loader, picker or robot, grinder for runners and rejects, and conveyors if parts are handled downstream. Add compressed air if the mould or robot uses it, and the cabling and piping for each.
How do I put a number on downtime?
Work out output per hour from cycle time, cavities and the share of good parts, then multiply by the hours the machine stands and by your margin on each part. Track stoppages by cause for a month. Mould changes, waiting for spares and unplanned breakdowns usually need different fixes.
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- Plastic Injection Moulding Machine Price in Mumbai
Sources & References
- ExxonMobil, AMI and Tangram Technology: An Energy Saving Guide for Injection Moulders
- MSEDCL: kVAh Billing: Frequently Asked Questions
- Deccan Chamber of Commerce, Industries and Agriculture, Pune: Circular No. 085: MERC Order dated 25 March 2026 on MSEDCL Review Petition
- PlasticsToday, R. Kent: Getting to know your real energy use and cost
Technical Disclaimer
Disclaimer: The information provided in this document is for general informational and educational purposes only. It is based on technical references and industry information available at the time of preparation and may be subject to change. It does not constitute engineering, technical, commercial or professional advice, nor does it constitute a quotation, specification, warranty or contractual commitment by Pratishna Engineers.
Actual injection moulding machine and process requirements vary according to the component design, material, mould, production volume, machine configuration and operating conditions. The information, examples, calculations and recommendations provided should be independently evaluated and verified for the specific application before making any equipment, process or production decision. Information obtained from third-party sources remains subject to the accuracy and limitations of those sources.
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