Product Description:

Refractance Window Drying (RWD) is an advanced lowtemperature drying technology, often referred to as the"Gentle Drying" method, positioned between Spray Drying (standard) and Freeze Drying (premium) in terms of quality and cost..” It is especially suitable for heat-sensitive and high-viscosity liquid or paste products

Main Advantages:

• Short drying time: typically 10-25mins
• Low actual product temperature (about 30‒70°C)
• Excellent retention of nutrients, flavor, color, and functional components
• Lower energy consumption compared with freeze drying
• Suitable for heat-sensitive, high-value product
• Final Moisture:3% - 5%
• Cleaning:CIP (Clean-In-Place) compatible

Application :

• Refractance Window dryers are ideally suited for products with stringent requirements regarding color, flavor, and active ingredients
• High-value fruits: Powders or slices of strawberries, blueberries, mangoes, and dragon fruit (preserving natural, vibrant colors).
• Traditional Chinese Medicine (TCM) extracts: Preventing the loss of active ingredient potency caused by high temperatures.
• Natural pigments: Such as betalains and phycocyanin.
• Health supplements: Honey powder, royal jelly, and probiotic carriers.

Technical Parameters:

Comparsion with other drying methods

Working Principle:

Unlike conventional hot-air drying, the refractive window dryer does not rely on direct hot airflow. Instead, it combines heat conduction, infrared radiation, and a drying membrane:

• Hot water or another thermal medium is heated beneath a polymer film (typically polyester).
• The wet material is spread in a thin layer on top of the film.
• Heat is transferred through the film via conduction and infrared radiation, causing moisture to evaporate rapidly.
• As the film dries, it forms a barrier, automatically reducing further heat transfer, preventing overheating.
• This mechanism enables gentle, uniform, and efficient drying

About us:

YGT is a professional scientific and innovative food machinery supplier from China. It is operated by a group of expert engineering team and international sales team with more than 10years working in juice and dairy processing industry. We provide turnkey solution including production line layout with water, gas,electric cable design,from equipment custom made, site installation&commissioning and skill training.
Our main products including: UHT sterilizer,filling machine, CIP system;Project for fruit & vegetable juice/sauce processing,beverage plant, drinkable watertreatment and dairy production line and so on.

Our service is from reliable manufacturer choose, quality check in process and before delivery, spare parts continuous supply, YGT engineer achieve in strictly and honest attitud to final product and project and guarantee commitment to our customers.
YGT people adhere to corporate philosophy "Technology Innovation” to design more reasonable and cost effective proposal which make sure our honored clients produce high quality product to win the market.