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: 含糖量高, 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, 味道, 和营养价值. 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 & 除湿 – 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 (例如。, 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, 耐嚼的质地.

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, 糖燃烧, or uneven results.

高容量 / 连续操作
这台连续的干燥机可以使圆润, 不间断的生产, 产量高和效率, 使其适合大规模的工业生产.

均匀干燥 / 高质量的一致性
多阶段热空气穿透和高度透气的网格带结构确保在整个材料层中均匀分布热空气, 有效防止某些部分的过度干燥和干燥.

低能消耗 / 高热效率
热空气回收和循环设计重新加热; 与独立的本地控制结合, 每个部分都更有效地使用热量, 节省能源.

优质的营养和颜色保存
精确的温度控制和低干燥温度 (可逐一调整) 最大程度地减少胡萝卜中敏感组件的破坏, 例如维生素, 胡萝卜素, 和颜料.

灵活的 / 可扩展 / 小足迹
模块化, 多层结构允许在有限的工厂空间内产生较大的生产能力. 未来的扩展只需要其他模块.

易于操作和维护 / 高自动化
智能控制系统以及自动输送和除湿机制最小化手动干预, 导致稳定的操作和低维护成本.

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. 可编程逻辑控制器 + HMI Intelligent Control with 10 Preset Programs

A 7-inch touchscreen allows you to set time, 温度, 湿度, 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, 日本, 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 小时. 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

• 活力: Save 70% vs. electric dryer.

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

• 维护: 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

不锈钢结构, smooth welds, and absence of combustion gases make it easy to pass HACCP, 良好生产规范, and BRC audits. We provide complete documentation (material certificates, CE, 国际标准化组织) to support your export certification.

这 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: 糖燃烧, 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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