Everything you add to soap — fragrance, colour, glycerine, preservative, whitener — has to be spread evenly through the whole batch, or you get bars from the same shift that look like different products. The sigma mixer (also called an amalgamator) is the machine that does this, and it is the stage where most colour and fragrance problems are actually created or avoided.
Where It Fits in a Soap Production Line
- Blending soap base with fragrance, colour and functional additives
- Mixing and homogenising melted soap base before milling
- Wet mixing where the batch needs a jacketed, heated vessel
- Amalgamating additives into soap noodles in small and medium plants
- Also used for vacuum soap emulsifying and homogenising configurations
Specifications
| Function | Mixing and homogenising soap base with additives |
|---|---|
| Working volume | 500 – 2,000 L typical; larger on request |
| Agitator | Sigma blade / ribbon design with scraper, or high shear |
| Heating | Jacketed vessel, steam or electric, with insulation |
| Material | Stainless steel 304 (316L optional) |
| Discharge | Bottom or side discharge, manual or pneumatic |
| Motor power | TBC |
| Voltage / frequency | TBC (built to your local supply) |
| Dimensions / weight | TBC |
| Material (contact parts) | Stainless steel 304 (316L optional) |
| MOQ | 1 set |
| Warranty | 1 year |
Key Features
Be clear about which unit you need
Buyers use three names for this stage: mixer, amalgamator and emulsifier. A plain mixer blends solid or semi-solid soap with additives. An amalgamator is aimed at blending additives into noodles. A vacuum emulsifier / homogeniser is used when the soap or cream base has to be de-aerated and finely dispersed. They are different machines for different jobs — tell us what you are putting in and we will point you to the right one rather than selling you the wrong one.
Jacket and insulation
Soap base solidifies when it cools, and a mixer full of set soap is an expensive problem to clear. A jacketed, insulated vessel with heated walls keeps the batch workable through mixing and discharge. For a factory in a hot climate this still matters, because the jacket also lets you control the temperature rather than letting ambient conditions decide.
Scraping, not just stirring
In a plain mixer, soap sticks to the wall and the material next to the wall never gets blended. A scraper on the agitator keeps the whole batch moving. Ask specifically whether the agitator has scrapers — on a soap mixer this is a real specification difference, not a detail.
Dosing accuracy is where consistency comes from
Even mixing does not help if the fragrance was measured wrong. Weigh additives rather than measuring by volume, and record the batch sheet for every batch. The mixer makes the result repeatable; the batch sheet makes it traceable.
Price, MOQ and Lead Time
Our vacuum soap emulsifier / homogeniser machines are currently listed at US$2,800 – 3,000 per set. Mixer and amalgamator price depends on working volume, agitator type and whether the jacket is steam or electric — ask for a price for your batch size.
MOQ 1 set. Payment terms: T/T, L/C at sight, or as agreed. Sea freight, spare parts and installation service can be arranged on request.
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Frequently Asked Questions
What size mixer do I need for my line?
As a rule of thumb the mixer should hold at least one hour of production. For a 500 kg/h line that means a working volume around 500 L, with headroom above the fill line. Tell us your capacity and we will confirm the volume rather than let you size it by guesswork.
Steam or electric heating?
Electric is simpler when you have no boiler and is common in small plants. Steam is more economical at scale and heats faster and more evenly. If you already have a boiler, use steam; if not, the cost of adding one usually decides it.
Can the same mixer be used for both laundry and toilet soap?
Yes, provided you clean it thoroughly between products. Colour and fragrance carry over strongly, so if you make both a white toilet soap and a dark laundry bar, plan a proper cleaning procedure and ideally a second vessel for the fragrance-sensitive product.