Kelp isIn seafood productsA nutritious edible brown algae containing acidic polysaccharides, fucoidan sulfate, and macrophycinclassContains over 60 types of nutrients.haveradiation hardening，Beauty and HairdressingandLowering blood pressure, blood lipids, and blood sugareffect. At present, the use of seaweed freeze-drying technology is applied in the freeze-drying processing of seafood through food freeze-drying machines. The freeze-dried seaweed can maintain its original color, aroma, taste, shape, and nutritional components, as well as retain various minerals. After freeze-drying, it contains very little water and can be stored at room temperature for a long time, with good rehydration properties.

Determine the freeze-drying process technology of kelp based on the determination of its crystallization temperature and dissolution temperature. Before vacuum freeze-drying, cut the kelp into shreds or slices as needed, cook it, cool it, drain it, and put it on a tray into a food freeze dryer. There are three stages in food freeze-drying equipment: pre freezing, one-time drying, and analytical drying. The specific steps are as follows:
1. Pre freezing stage: Freeze at ultra-low temperature -45 ℃ for 180 minutes;

2One drying: control the temperature range of -30~20 ℃, control the time: 600 minutes, control the heating rate, control the vacuum degree to 30~40pa, and remove about 85~90% of the flowing water;

3Analysis drying: Control the temperature range of 30-60 ℃, control the time for about 500 minutes, control the heating rate, control the vacuum degree to 20-30 Pa, and remove about 10% of bound water.

The above is the seaweed freeze-drying process technology, which is dried by a food freeze-drying machineProcessing can keep the active ingredients such as kelp extract and various vitamins basically unchanged, including color, aroma, taste, shape, etc. It has good rehydration properties and can be sealed and stored for a long time at room temperature after sealed packaging. becauseApplication of food freeze dryerDue to its advantages, it is widely used in deep processing of marine products through freeze-drying, freeze-drying of fruits and vegetables, freeze-drying of pet food, and freeze-drying of meat products.