Short answer: a turmeric, ginger and onion powder unit runs on five core machines — a peeling cum washing machine, a slicer, a dryer, a grinder or pulverizer and a packing machine. There is a sixth that almost every first-time buyer leaves out, and it is the one that decides whether your powder looks professional. We will come to it.

Why these three products share one line

Turmeric, ginger and onion are all high-moisture rhizomes or bulbs that become shelf-stable powders by the same route: clean, reduce size, dry, grind, sieve, pack. The machines are the same. What changes between them is the drying temperature, the drying time and the yield — and if you treat all three identically you will ruin at least one of them.

That shared line is genuinely useful commercially. Onion has year-round demand, turmeric peaks around harvest, and ginger sits in between. One set of machines, three revenue streams, and far less idle time than a single-product unit.

The five machines you actually need

1. Peeling cum washer machine

Turmeric and ginger come out of the ground carrying soil in every crevice. Onion needs its outer skin removed. Both jobs happen here.

A 1 HP potato peeler uses an abrasive drum that removes skin and soil together, and it works on ginger and turmeric as well as potato. For higher volumes a bubble washer or an automatic conveyor washer handles bulk cleaning continuously.

One warning that costs people money: do not over-peel ginger. A large share of ginger's aroma compounds sit just under the skin. Abrasive peeling that removes 2 mm instead of 0.5 mm quietly strips the value out of your product, and you will not see it until a buyer rejects the aroma.

2. Slicer machine

Whole rhizomes will not dry properly. The outside case-hardens while the centre stays wet, and that trapped moisture is exactly where mould starts three weeks into storage. Slicing is what makes drying uniform.

A slicer gives you consistent thickness, which is the whole point. A fruits and vegetables cutter covers slicing and dicing if you also want to sell dried flakes, which carry a better margin than powder in some markets.

Aim for roughly 3–5 mm. Thinner dries faster but crumbles and you lose material through the tray mesh; thicker dries unevenly. Consistency matters more than the exact number — mixed thicknesses in one tray means some slices are done while others are not.

3. Dryer machine

This is where quality is won or lost, and where most of your electricity or fuel goes.

A 6 tray dryer suits a pilot or small unit. A 12 tray stainless steel dryer is the practical starting point for a commercial operation. Food-grade stainless matters here — turmeric is acidic and staining, and mild steel trays will not survive it.

Target conditions differ by product:

Two things to take from that table. First, onion has by far the worst yield — it is close to 86% water. Price your onion powder against 8–10 kg of raw onion per finished kilogram, not against the market rate for a kilogram of onion, or your costing will be badly wrong.

Second, resist the temptation to push the temperature up to finish faster. Above about 60°C turmeric loses colour, ginger loses aroma, and onion develops a cooked, sulphurous note instead of a clean pungency. You will save four hours and lose your price premium.

4. Grinder / pulverizer machine

Dried slices become powder here. The choice of machine is more consequential than it looks.

A 3 HP multipurpose pulverizer is the standard workhorse and handles all three products. A blower cyclone pulverizer moves air through the grinding chamber, which carries heat away and collects the powder in a cyclone — cooler grinding means you keep more of the volatile oils that give ginger its aroma and turmeric its colour. A two in one pulverizer gives you coarse and fine grinding in one machine.

The principle worth understanding: grinding generates heat, and heat destroys exactly what you are selling. Ginger's value is its aroma. Turmeric's value is its curcumin colour. Both degrade in a hot grinding chamber. Feed at a steady moderate rate rather than choking the machine, let it run cool, and your powder will out-sell a competitor grinding the same raw material harder and faster.

5. Packing machine

A form fill seal (FFS) packing machine forms the pouch, fills it and seals it in one cycle — this is what you need for retail pouches at any volume. For pre-made pouches, or for starting small, a band sealer is the low-capital option. Batch and expiry coding is a legal requirement on every pack, handled by a price codder.

A detail specific to this product: onion and garlic powders are strongly hygroscopic. They pull moisture out of the air and cake into a solid block. Pack them promptly after grinding, in a room that is as dry as you can manage, in a good moisture-barrier laminate. Powder that cakes in the distributor's warehouse comes back to you.

The sixth machine nobody budgets for

A vibratory sifter. Straight out of any pulverizer you get a mix of particle sizes — some fine, some coarse, some almost whole. Sieving separates them so you pack one consistent mesh, and returns the oversize to the grinder instead of throwing it away.

Most masala powders sell at 60–80 mesh. Skip the sifter and your pouches contain visibly gritty powder next to fine powder, which reads as cheap on the shelf no matter how good your raw material was. This machine is not expensive and it changes how your product looks in the buyer's hand.

Turmeric needs one extra step

Traditional turmeric processing boils or steams the fresh rhizomes before drying — this is called curing. It gelatinises the starch, distributes the colour evenly through the rhizome, cuts the drying time and produces the uniform bright colour buyers expect. Raw-dried turmeric looks patchy by comparison.

A gas operated boiling kettle handles this stage. Boil until a stick passes through the rhizome easily, then drain and move to the dryer. If you are selling turmeric powder on colour — and in practice everyone is, because curcumin content is what commands the premium — do not skip curing.

Keep the three products apart

Turmeric stains everything it touches, permanently. Onion and garlic carry aroma into any surface they sit on. Run onion powder through a pulverizer that ground turmeric that morning and you will have yellow-tinged onion powder that smells faintly of turmeric, and it is unsellable at a good price.

Two workable answers: schedule long production runs of one product and clean thoroughly between changeovers, or — once volumes justify it — keep a dedicated grinder for turmeric. Plan for this in your layout from the beginning rather than discovering it after your first rejected consignment.

Sizing your unit

Drying is almost always the bottleneck, because it is the one stage measured in hours rather than minutes. A 12 tray dryer running a 6–8 hour cycle sets the rhythm of your whole day. When you outgrow the unit, add dryer capacity before anything else.

Space, power and licences

• Space: roughly 800–1,200 sq ft for a 200–500 kg/day unit. Keep wet processing, drying and the grinding-and-packing area physically separated — dry powder and wet washing in the same room is a contamination problem waiting to happen.
• Power: three-phase. Dryer and pulverizer are the heavy loads.
• Storage: finished powder needs a dry store. Humidity is the enemy of every product on this line.
• Licences: FSSAI licence (registration, State or Central by turnover and capacity), GST, Udyam (MSME) registration, and a local trade licence. Spices carry their own labelling expectations, and exporters will additionally need to meet buyer-country limits on pesticide residue and microbiology.

Requirements and thresholds change — confirm the current position with FSSAI or your consultant rather than relying on any article, this one included.

Frequently asked questions

Talk to us about your unit

We manufacture every machine described above and install them across India, with commissioning, operator training and GST invoicing. Tell us your daily fresh input, which products you are starting with, and whether you are selling retail pouches or bulk — we will tell you which models fit and, just as usefully, which ones you can add later instead of buying now.

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Planning a sauce or pulp line instead? Read our guide to starting a tomato sauce and ketchup unit.

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