Industrial Mint Dehydration Case Study: Guoxin Group Heat Pump Drying Test-Guoxin Machinery

Project Overview

In April 2026, Guoxin Group conducted a specialized drying test for fresh mint leaves. The primary challenge in herb dehydration is maintaining the vibrant green color and high concentration of essential oils (menthol), which can be easily lost if the drying temperature is too high or the airflow is uneven.

The Equipment: Intelligent Heat Pump Drying Machine

For this test, we utilized our Energy-Saving Heat Pump Drying Machine designed for batch processing with high precision.

System Type: All-in-one Heat Pump Dehydrator.
Capacity: Tested on a 2–3 ton industrial-scale unit.
Material Standards: Interior racks and the drying environment are constructed to ensure food-grade safety and hygiene.

The Dehydration Process

A. Preparation & Loading

Freshly harvested mint is spread evenly across multi-layer food-grade plastic trays. Our staff ensures that the leaves are not over-stacked, allowing for maximum surface area exposure to the circulating air.

B. Intelligent Parameter Setting

The system is managed by a WKD6070C PLC control panel, allowing for multi-stage drying cycles.

Set Temperature: $50\text{°C}$ .
Target Humidity: $60\%$ .
Monitoring: Real-time sensors track the internal temperature and moisture levels to prevent over-drying.

C. Circulating Airflow

The drying chamber uses a horizontal airflow design. Hot air passes through every layer of the trolley simultaneously, ensuring that the mint at the top of the rack dries at the exact same rate as the mint at the bottom.

Key Results & Product Quality

The test concluded with exceptional product standards:

Color Retention: The dried mint maintained its natural green chlorophyll pigment, a critical requirement for premium tea and culinary markets.
Fragrance Preservation: By using low-temperature heat pump technology, the volatile aromatic compounds remained intact.
Uniformity: Every tray showed consistent moisture content, reducing waste and the need for manual sorting.

Why Choose Heat Pump Drying for Herbs?

Feature	Guoxin Heat Pump Advantage
Energy Efficiency	Uses $1\text{kW}$ of electricity to move $3\text{--}4\text{kW}$ of heat, reducing costs by up to $70\%$ .
Quality Control	Precise PLC control avoids the “browning” effect caused by traditional high-heat dryers.
Environmental Impact	Zero emissions and low noise, making it suitable for modern food processing plants.
Intelligence	Automatic drainage and humidity control require minimal operator intervention.

Technical Consultation

Guoxin Group provides customized drying solutions for a wide range of leafy greens, including spinach, curry leaves, coriander, and mint.

Get a Quote for Your Herb Drying Project] [Download Technical Specifications for Heat Pump Chambers