Dryfree mainly sells dehydrator, solar dryers, heat pump dryer machines and solar+heat pump dryer.

Introduction of dried pineapple drying process

Pineapple is a common tropical fruit with golden flesh, rich fragrance, sweet and sour taste, crisp and juicy, and is welcomed and loved by the public. In Chinese medicine, pineapple is considered to be slightly cold in nature and sweet in taste. It has the effects of clearing heat and relieving heat, promoting body fluids and quenching thirst, and promoting urination. It can be clinically used for the treatment of heatstroke, body heat, polydipsia, and urination problems.

Traditional dried pineapple is mainly dried by electric heating or dried in the sun, both methods have obvious shortcomings. One is that the quality of pineapple is easily affected by the weather, wind, rain, etc. when drying in the sun, and the other is that electric heating consumes a lot of electricity, the drying operation cost is relatively high, and the price of finished dried pineapple is relatively high. Intelligent control, energy-saving and environmentally friendly heat pump drying will become the first choice for drying pineapples and other fruits and vegetables.

Production process of dried pineapple with heat pump dryer

1. Fruit selection processing

Choose eight mature pineapples, remove rotten fruit, diseased fruit, and insect fruit. Peel and remove the core and eyes. The flesh has turned yellow, with pineapple aroma, and sliced. Each slice is 3-4 mm thick and fan-shaped.


2. Treatment of concentrated sugar liquid

Prepare 60% sucrose solution, that is, 100 kg of sugar solution contains 60 kg of granulated sugar and 40 kg of water. Dip the pineapple slices in 60% sugar solution, just after the sugar solution has soaked the raw materials, the sugar soaking time is 24 hours.

3. Drying

Pick up the pineapple slices from the sugar solution, drain the water, and dry at 65°C for 18-20 hours until the water content reaches 16%, which is the standard.

The drying process in the heat pump drying system is roughly divided into 5 drying stages


The first stage: drying, no dehumidification, about 1.5 hours, the same temperature inside and outside, the temperature is 50 degrees.

The second stage: the temperature is 53 degrees, continuous dehumidification begins, and the dehumidification reaches 40%.

The third stage: temperature 58 degrees, continuous dehumidification, humidity 26%.

The fourth stage: temperature 55 degrees, humidity 20%, continuous dehumidification.

The fifth stage: temperature 48 degrees, humidity 18%, continuous dehumidification for 1 hour, drying is completed.

4. Packaging

The dried pineapple slices or pineapple slices will regain moisture in direct contact with air, so they need to be sealed and packaged. If possible, vacuum packaging can be used to better preserve the color and fragrance of the pineapple slices or pineapple slices.


Post time: Sep-29-2020