Cashew nuts are typically dried at 70°C for 6-7 hours, though sun drying is also common. The presence of cashew nut shell liquid (CNSL) in the shells makes the process somewhat hazardous and requires careful handling.
Here's a more detailed look at the drying process:
Drying Methods for Cashew Nuts
There are two main methods for drying cashew nuts:
1. Sun Drying
- Preparation: Spread the cashew nuts in a single layer on a hard, clean surface like a concrete yard.
- Process: Allow the nuts to dry under direct sunlight. Turn the nuts periodically to ensure even drying.
- Duration: The time required for sun drying varies based on weather conditions but generally takes several days.
- Considerations: This method is cost-effective but is weather-dependent and may lead to inconsistent drying. It also has higher risk of contamination.
2. Artificial Drying (Oven Drying)
- Temperature: Maintain a consistent temperature of 70°C (158°F).
- Process: Spread the cashew nuts in a single layer on trays inside the oven or dryer.
- Duration: Typically, the drying process takes 6-7 hours.
- Considerations: This method offers more control over the drying process, resulting in consistent quality. It is less dependent on weather conditions but requires specialized equipment and energy.
Important Considerations
- Cashew Nut Shell Liquid (CNSL): Be cautious of CNSL, which is caustic and can cause skin irritation. Use protective gloves during handling.
- Even Drying: Ensure even drying to prevent mold growth and maintain quality.
- Moisture Content: The target moisture content is usually around 8-10% for safe storage.
