How to Dry Apple/Dehydrate Apple in a Dehydrator

Jul 19, 2021

Introduction to apple：

Apples have high nutritional value, rich in minerals and vitamins, and rich in calcium, which helps metabolize excess salt in the body. Malic acid can metabolize calories and prevent lower body obesity. Apple trees are temperate fruit trees that prefer low temperature and dryness, requiring no severe cold in winter and intense heat in summer. It is generally believed that apples can be cultivated in areas where the average annual temperature is between 7.5℃ and 14℃.

Apple processing steps：

Choose the fruit with dense flesh, high sugar content, thin skin and thick flesh, and full ripeness to remove rotten fruit and broken fruit. In order to remove the pesticides on the peel, the fruit is soaked in a 0.5%-1% dilute hydrochloric acid solution for 3-5 minutes and then cleaned with running water. Manually or mechanically peel, remove the fruit core, cut into 7-8mm thick discs, and then put it in salt water.
Put the cut apple slices in 3-5% salt water or 0.5% sodium sulfite solution to protect the color to prevent oxidation and browning. Pick up the fruit slices and place them on the plate, and send them to the sulfur fumigation room for sulfur fumigation for 15-30 minutes. Every 1000 kg of fruit slices burns 2-4 kg of sulfur.

Apple drying process：

The initial temperature of drying is 80℃-85℃, and then gradually decreases to 50℃-55℃, the drying time is 5-6 hours, and the relative humidity is 10% after the final drying. The drying rate is (6-8):1 (ie 6- 8 kilograms of raw materials can be made into 1 kilogram of finished products). The dried finished product should be elastic and not stick to each other when the hands are tightly held and then relaxed. Put the dry product in an airtight container for 15-20 days to soften it so that the moisture content is uniform and the texture is soft. Eliminate waste and wet products, pack the finished products in food bags or cartons, and keep them away from moisture during storage.

Recommendation of apple dryer/drying machine

Commercial 100-3000kg/h large amount of dehydration wide application and easy operation

Heat pump drying machine use the principle of inverse Carnot cycle. It absorbs low-temperature heat energy in the air, which becomes high-temperature heat energy after efficient heat collection and integration by the heat pump system, and is transported to the drying room for cyclic heating and drying of materials.It refers to exhausting the hot and humid air in the drying room directly to the outside of the drying room through dehumidification device, and then replenishing natural fresh air.

Hot air circle drying machine belongs to high temperature heat pump unit. Its working principle is: the working fluid of the heat pump is compressed by the compressor, becomes high temperature and high pressure gas, enters the condenser, condenses and liquefies the heat, and is used for air heating in the drying room. The moisture in the material is vaporized and evaporated by the form of hot air, and the evaporated water vapor is discharged by the moisture discharge system, thereby achieving the purpose of drying the drying material.