Sigma Mixer For Different Applications | JCT Machinery

Q
Sigma mixer plays a crucial role in both the food and chemical industries, but its design, structure, materials, manufacturing methods, and safety standards are completely different. Many customers ask:
"Is there a difference between a sigma mixer used for producing chewing gum and one used for producing hot melt glue?"
The answer is: The differences are significant, and they are not interchangeable.

The application industries are completely different, and the design logic is also different.

Type	Main Application	Feature
Food grade sigma mixer (chewing gum, toffe, pectin candy, chocolate sauce, etc.)	Food processing	Requires food-grade materials, easy cleaning, hygienic design, and must be free from contaminants
Chemical grade sigma mixer (hot melt glue, sealant, rubber, ink, etc.)	Chemical production	Powerful mixing, high-temperature operation, must withstand viscosity and shear forces, and handle corrosive and volatile substances

sigma blade mixer

Key Differences Comparison

1. Different Material Requirements for Contacting Materials
Food-grade sigma mixer:
Inner wall, mixing blades, discharge gate → all made of SS304/316.
Surface requires mirror polishing, easy to clean with no dead corners.
No welding slag, sharp edges, coating peeling, or other risks are allowed.
Complies with FDA and food-grade hygiene standards.
Chemical-grade sigma mixer:
Materials mostly use carbon steel + wear-resistant coating/alloy steel.
Focuses on strength, wear resistance, and high temperature resistance.
Allows for the installation of corrosion-resistant coatings and high-temperature oil seals.
The focus is on viscosity resistance and wear resistance, not hygiene standards.
2. Differences in Heating Methods
Food-grade sigma mixer:
Commonly uses steam heating or electric heating.
Temperature range: 60-120℃
Stable temperature control, preventing food scorching or carbonization.
Chemical-grade sigma mixer:
Mostly uses heat transfer oil heating.
Temperature up to 180-220℃.
Suitable for resin melting, high-temperature mixing of tackifiers, and other applications.
3. Differences in Vacuum System and Sealing Structure
Food-grade sigma mixer:
Mostly does not require a vacuum system.
If degassing is needed, the vacuum level is relatively low.
Chemical-grade sigma mixer:
Usually equipped with a high vacuum system.
The sealing structure must be heat-resistant and solvent-resistant; otherwise, leakage will occur.
4. Different Strength Requirements for Mixing Blades
Food-grade sigma mixer:
Mixing blades are lighter in size, mainly used for plasticizing sugar and gum.
Ease of cleaning is a key focus.
Chemical-grade sigma mixer:
Mixing blades must be thicker and heavier, providing stronger shear force.
Capable of handling viscosities of 100,000+cps.
5. Different Safety Standards
Food-grade sigma mixer:
Meets food safety regulations.
No sources of contamination allowed.
Attention to the risk of bacterial growth.
Chemical-grade sigma mixer:
Focuses on explosion protection, high temperature resistance, and prevention of solvent leakage.
Explosion-proof motors and electrical control systems are available as options.

sigma mixer blade

Why can't the two types of sigma mixers be used interchangeably?

1. Food-grade sigma mixer cannot be used with chemical raw materials → risk of contamination.
2. Incompatible materials; food-grade sigma mixer is more expensive and unsuitable for high-temperature, heavy-duty chemical mixing.
3. Chemical-grade sigma mixer does not meet hygiene standards.
4. Different mixing intensity and blade strength.
5. Different cleaning methods.
6. Even if the structure is similar, the two types are completely interchangeable in terms of their intended use.

Although food-grade and chemical-grade sigma mixers share the same name, they are actually two completely different types of industrial equipment. Clearly defining the intended use, process requirements, and material specifications is the most important principle when purchasing.
For further information on equipment specifications, pricing, or process configuration options, please feel free to contact us: +86-18138373963 (Whatsapp, Wechat) or contact@jctmixing.com.

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Sigma Mixer For Different Applications | JCT Machinery

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