Why do the inner walls and blades of sigma mixer need to be mirror-polished?

In the production of high-viscosity materials (such as hot melt glue, silicone rubber, butyl glue, chewing gum and resin composites), the condition of the equipment's inner wall and the surface of the impeller directly affects:

• Mixing uniformity
• Batch stability
• Cleaning difficulty
• Cross-contamination risk
• Equipment lifespan

Therefore, sigma mixer is typically mirror-polished (Ra≤0.4-0.8μm).

1. Improving mixing efficiency and uniformity

High-viscosity materials exhibit "viscoelastic flow" during kneading.

If the inner wall is rough, it may cause:

• Material easily adheres to microscopic pits
• Local "dead material zones" to form
• Prolonged mixing time
• Uneven filler dispersion

After the inner wall and impeller be mirror-polished:

• Reduced surface friction coefficient
• Smoother material flow
• More stable shearing
• More uniform mixing

Directly improves product quality stability.

2. Reduce residue and minimize cross-contamination

For sealants with frequently changing colors, medical-grade or electronic-grade silicone rubber, and high-value-added specialty adhesives, residue is a risk.

Mirror polishing can:

• Reduce material adhesion to the container
• Reduce residue levels
• Shorten cleaning time
• Reduce solvent consumption

Improve production efficiency while protecting formula safety.

3. Extending equipment lifespan

Rough surfaces easily trap filler particles, forming localized wear points and exacerbating corrosion.

Mirror polishing can:

• Reduce wear
• Reduce corrosion adhesion
• Extend equipment lifespan

Mirror polishing of the inner wall and impeller of the sigma mixer is not only a technical requirement, but also a standard requirement in the medical and food industries.

As an equipment manufacturer, we employ the following techniques in the manufacturing process of the sigma mixer's inner walls and blades:

• Precision machining
• Multi-stage polishing processes
• Controlling surface roughness Ra≤0.4μm (higher standards can be customized)
• Ensuring no sharp edges or weld spatter residue

We provide not only equipment, but also a stable and replicable production foundation.