Grinding heats the material.
For spices with natural essential oils, that heat can change colour and aroma and make oily powder stick and block screens. A cold air grinding system introduces low-temperature air, typically −15 ℃ to 0 ℃ depending on the material, into the grinding chamber to keep the process stable.
- Protects colour and aroma
- Prevents oil release and screen blocking
- Improves production stability
- Suits chili, pepper, ginger, turmeric, herbal and other oil-containing materials
Why heat is the problem
Many spices contain natural essential oils and heat-sensitive components. During grinding, excessive temperature increase may affect the colour, aroma and quality of the final powder.
The cold air solution
For these materials, a cold air grinding system can be integrated with the spice grinding machine to control processing temperature. By introducing low-temperature air into the grinding chamber, the system helps maintain a suitable grinding environment. The cooling air temperature can typically be controlled between −15 ℃ and 0 ℃, depending on material characteristics and production requirements.
Three benefits
Maintain natural colour and aroma
The cooling system reduces heat generation during grinding, protecting the natural characteristics of spices.
Prevent oil release and screen blocking
Some oily spices release oil under excessive heat, causing powder adhesion and screen blockage. Temperature control reduces these problems and improves continuous operation.
Improve production stability
A stable grinding temperature gives more consistent powder quality and longer operating time.
What it suits
Cold air grinding is one part of a complete spice production line. For finer powder, see the air classifier mill.
QWhat temperature is cold air grinding done at?
The cooling air can typically be controlled between −15 ℃ and 0 ℃, depending on the material and production requirements.
QWhich spices need it?
Heat-sensitive and oil-rich ones such as chili, pepper, ginger, turmeric and herbal materials.
QWhy does oil release matter?
Released oil causes powder adhesion and screen blockage, which cuts production efficiency.
