The prunes dryer machine is a specialized industrial drying system designed specifically for processing fresh plums into high-quality prunes. Unlike generic dryers, this equipment addresses the unique challenges of prune drying: alto contenido de azúcar, surface stickiness, susceptibility to browning, and the need for a tender-yet-chewy final texture. Whether you process French Agen plums, California d’Agen, or Japanese varieties, this machine delivers consistent moisture removal while preserving natural color, sabor, y valor nutricional. It is widely adopted by medium-to-large scale prune processors across Europe, North America, South America, and Asia.

Unlike traditional dryers that constantly exhaust hot air, this machine operates on a recirculating heat pump dehumidification principle. Here is the step-by-step process:

1. Air heating & deshumidificación – The heat pump evaporator cools incoming air to below its dew point, condensing moisture out of the system. The dry, cool air then passes through a condenser where it is reheated to the preset drying temperature (P.EJ., 55°C for prunes).

2. Closed-loop circulation – The hot, dry air is blown evenly through the drying chamber, absorbing surface moisture from the plums. Instead of being expelled, the humid air returns to the evaporator for dehumidification and reheating – losing virtually no heat to the environment.

3. Multi-stage drying program – A PLC controller automatically adjusts temperature and humidity in three phases:

   • Phase 1 (60–65°C, high airflow) – Quickly removes surface moisture without cracking the skin.

   • Phase 2 (55–58°C, moderate airflow) – Slowly pulls internal water to the surface, preventing case hardening.

   • Phase 3 (45–50°C, low airflow) – Finishes drying to a final moisture content of 18–22%, ensuring a tender, textura masticable.

4. Automatic stop – A built-in humidity sensor stops the cycle when the target moisture is reached, avoiding over-drying.

The entire process takes 18–28 hours, depending on plum variety and loading density – all without generating hot spots, quemadura de azucar, or uneven results.

Alta capacidad / Operación continua
Esta máquina de secado continuo permite trabajar las 24 horas, producción ininterrumpida, con alto rendimiento y eficiencia, haciéndolo adecuado para la producción industrial a gran escala.

Secado uniforme / Consistencia de alta calidad
La penetración de aire caliente en varias etapas y una estructura de malla altamente transpirable garantizan una distribución uniforme del aire caliente por toda la capa de material., Previniendo eficazmente el secado excesivo y insuficiente de algunas secciones..

Bajo consumo de energía / Alta eficiencia térmica
El diseño de circulación y recuperación de aire caliente reutiliza el calor.; combinado con control local independiente, cada sección utiliza el calor de manera más eficiente, ahorro de energía.

Excelente nutrición y conservación del color.
Control preciso de la temperatura y bajas temperaturas de secado. (ajustable sección por sección) Minimizar la destrucción de componentes sensibles en las zanahorias., como vitaminas, caroteno, y pigmentos.

Flexible / Escalable / Pequeña huella
los modulares, La estructura multicapa permite una gran capacidad de producción dentro de un espacio limitado en la planta.. La expansión futura solo requiere módulos adicionales.

Fácil operación y mantenimiento / Alta automatización
El sistema de control inteligente y los mecanismos automáticos de transporte y deshumidificación minimizan la intervención manual., lo que resulta en una operación estable y bajos costos de mantenimiento.

1. Closed-Loop Heat Pump System with R134a/R290 Refrigerant

The core component is an industrial-grade heat pump unit that both dehumidifies and reheats air inside a sealed chamber. No exhaust duct is needed – 100% of heat is recycled.

2. Stainless Steel Drying Chamber & Multi-Layer Trays

All food-contact surfaces are SUS304 stainless steel (SUS316 optional). Trays are designed with a non-stick mesh pattern to prevent prunes from adhering during the high-sugar drying stage. Each tray can hold 10–15 kg of fresh plums.

3. SOCIEDAD ANÓNIMA + HMI Intelligent Control with 10 Preset Programs

A 7-inch touchscreen allows you to set time, temperatura, humedad, and fan speed for each drying stage. You can save up to 10 custom programs – for example, one for early-season plums (higher moisture) and another for late-season plums.

4. Reversible Airflow Fans

Two large axial fans inside the chamber reverse direction every 30–40 minutes. This eliminates “drying shadows” – areas where air cannot reach – ensuring every prune on every tray dries at the same rate.

1. Higher Selling Price with Grade-A Prunes

Grade-A prunes (uniform size, intact skin, soft chew, bright purple-black color) sell for 40–60% more than Grade-B or sun-dried prunes in export markets like Germany, UK, Japón, and USA. Our dryer consistently produces 90%+ Grade-A output from good-quality fresh plums.

2. Weather-Independent Production – Dry Even During Rainy Seasons

Sun drying takes 5–10 days and can be ruined by unexpected rain, dew, or insects. With a heat pump dryer, you harvest in the morning and start drying within 2 horas. You can operate 24/7 during the 6–8 week plum harvest window, processing multiple batches without weather delays.

3. Lower Operating Cost = Higher Net Margin

• Energía: Save 70% vs. electric dryer.

• Mano de obra: Automated controls require only 1–2 hours of daily supervision (loading/unloading trays).

• Mantenimiento: Heat pump compressor needs service once every 3–5 years. No heating elements to replace.
  Many customers achieve full ROI within 8–14 months.

4. Meets International Food Safety & Export Standards

La construcción de acero inoxidable, smooth welds, and absence of combustion gases make it easy to pass HACCP, BPM, and BRC audits. We provide complete documentation (material certificates, CE, YO ASI) to support your export certification.

El heat pump prunes dryer machine is not a standard dehydrator – it is a purpose-built, energy-saving system that respects the delicate nature of plums. Its closed-loop heat pump design, low-temperature operation (max 65°C), reversible airflow, and non-stick stainless steel trays directly address the biggest challenges in prune processing: quemadura de azucar, sticking, uneven drying, and high energy costs. The advantages translate into tangible benefits: higher Grade-A yields, weather-independent production, lower operating costs, and full export compliance. With proven third-party evidence and hundreds of satisfied users worldwide, this dryer is the smart investment for any prune processor who wants premium quality at the lowest possible cost per kilogram.

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