Planetary mixer vs spiral mixer: which one do you need?

The geometry — what each machine actually does

Planetary mixer

A planetary mixer has a fixed bowl and a tool that moves in planetary motion: the tool rotates on its own axis while orbiting the inside of the bowl, like a planet around a sun.

This gives you three things:

• Universal tool change — switch the hook (for dough), the paddle (for batter, filling, cream base), or the whisk (for meringue, cream, aerated batter) in seconds, and the same machine handles all of them.
• Orbital coverage — the tool reaches every point in the bowl, including the wall and the centre, by physical geometry. No dead zones.
• Variable speed in rpm — you can dial in the exact rpm window a recipe wants (especially with VEL variable-speed motors). Critical for cream, batter, mousse.

Spiral mixer

A spiral mixer has a rotating bowl and a fixed spiral tool. The bowl turns under the tool; the tool plunges and develops the dough by spiralling through it.

What that geometry does well:

• Gluten development at high hydration — the spiral tool develops gluten faster than a planetary hook, especially above 70% hydration.
• Low dough temperature rise — the spiral motion adds less friction-heat per kg than a planetary hook, important for long-fermentation breads.
• Throughput per cycle on dough — for the same volume, a spiral typically finishes a bread dough faster than a planetary with a hook.

What it doesn't do at all: aerate. There's no whisk attachment for a spiral mixer. The tool is fixed, the bowl turns under it, end of conversation. You can't make whipped cream or meringue on a spiral mixer.

Decision matrix — by recipe

Recipe	Planetary	Spiral
Bread dough, 60–70% hydration	✅ Good fit	✅ Good fit
Bread dough, 70–80% hydration (ciabatta, naturally leavened)	OK with hook + programmed curve	✅ Purpose-built
Pizza dough, 55–65% hydration	✅ Good fit	✅ Good fit
Pizza dough, 75%+ hydration (Neapolitan)	OK with care	✅ Purpose-built
Brioche / panettone / sweet enriched dough	✅ Purpose-built (paddle, low rpm, cool)	OK but limited speed control
Cream / whipped cream	✅ Whisk attachment	❌ Not possible
Meringue	✅ Whisk attachment	❌ Not possible
Mousse, aerated batter	✅ Whisk, variable rpm	❌ Not possible
Cake batter	✅ Paddle	❌ Not possible
Ganache, cream filling	✅ Paddle, scraper option	OK for thick fillings only
Cookie / biscuit dough	✅ Paddle	OK with hook
Sauce, gravy production	✅ Paddle + scraper	❌ Wrong geometry

The "we have both" pattern

Most large bakeries we work with run a hybrid setup:

• One or more spiral mixers for the main bread line (60–250 kg dough per cycle, several cycles per shift).
• One or more planetary mixers for everything else — sweet doughs, brioche, pastry, cream, batter, filling, meringue, glaze.

The economics: a dedicated bread line saves real time per cycle vs running bread on a planetary. A dedicated pastry / cream line on a planetary is the only way to do pastry production at all.

For a bakery transitioning from craft to industrial, the upgrade order usually goes:

1. One planetary mixer covering everything (dough, cream, batter) — the IBT 80-VEL or IBT 100-VEL is the typical first industrial machine.
2. If bread volume grows past 500–800 kg / shift: add a spiral for the main bread line; keep the planetary for everything else.
3. If pastry / cream volume grows: add a second planetary (often a larger one — IBT 140-VEL or IBT 200-VEL) and keep the first planetary for sweet doughs.

When a planetary is enough — even for bread-heavy bakeries

If you're producing 200–800 kg of dough per day across multiple recipes (bread, pizza, focaccia, brioche, biscotti) plus pastry / cream, a single planetary mixer with VEL variable speed and the right tool set covers all of it. The IBT 100-VEL is the size we recommend most often for exactly this profile.

The point at which a dedicated spiral starts to pay back is roughly:

• 1 tonne+ per shift of the same bread recipe — the time savings per cycle multiply.
• Very high hydration production (artisanal sourdough, Neapolitan pizza dough at 80%+) — the spiral handles it more reliably.
• Bakery only — no pastry, no cream, no aerated production. Then there's no reason to pay for planetary versatility.

What this means for sizing

If you're sizing your first industrial planetary mixer:

• Sum up your non-bread daily output (cream, batter, mousse, filling, paste, sweet doughs).
• Add at least your largest bread-dough batch (so a single mixer can pinch-hit on bread when needed).
• That's the bowl capacity you want at ~60% fill.

For most bakery + pastry operations the answer lands at the IBT 80-VEL or IBT 100-VEL. See 80 L vs 100 L vs 140 L for picking between them, and how to choose a planetary mixer for the full sizing framework.

Where Dirmak fits

Dirmak's IBT range is purely planetary — 10 L to 300 L, one continuous engineering platform. We don't manufacture spiral mixers in this product line. If you've decided you need a planetary, the IBT Industrial Mixers (80 L+) page is the natural next step. If your line genuinely needs a spiral, we're happy to point you to one — the engineering question matters more to us than the brand on the badge.