Production method of freeze-dried milk powder

Abstract

The invention discloses a production method of freeze-dried milk powder. The method comprises the steps of: standardizing raw milk after purification, separation and sterilization to obtain standardized milk; implementing low-temperature vacuum mutton smell elimination and concentration of the standardized milk to lead the dry matter content in the obtained concentrated milk to account for at least 45 percent to 50 percent of the total weight of the milk; implementing homogenization of the concentrated milk, cooling and storing the concentrated milk after the homogenization; implementing freeze-drying treating of the concentrated milk after the treatment by the steps, thereby leading water which is frozen into solid state in frozen milk to be directly sublimated to gaseous state and separated from the frozen milk after that, leading the residual dry matters in the frozen milk to be shaped like powder and flakes and further forming the freeze-dried milk powder; the nitrogen filling and the method of crushing nitrogen for granulation are adopted to process the freeze-dried milk powder into even granules, and then a finished product is prepared by screening and separation. The method leads nutritional components in the raw milk to have no loss or damage and avoids the significant loss of heat-sensitive matters, active matters and other nutritional components in the raw milk caused by high-temperature sterilization, spray drying and other procedures in the existing milk powder production process.

Description

technical field [0001] The invention relates to a milk powder production technology, in particular to a process for producing milk powder by adopting low-temperature freeze-drying technology. Background technique [0002] Most of the existing technologies for producing milk powder use multi-effect falling film concentrated spraying and hot air drying. Its specific process flow, such as figure 1 As shown, wherein, the specific functions of each step are as follows: [0003] Step 1. Raw milk inspection and measurement acceptance: inspect the raw milk and measure acceptance according to relevant standards; [0004] Step 2. Purification of raw milk: Somatic cells, white blood cells, red blood cells, dust and other fine impurities in raw milk and microorganisms in impurities are removed by high-speed centrifugation. The speed of centrifugal separation is generally 4500-5000 rpm. The temperature of purified milk after treatment is 35-45°C; [0005] Step 3. Cooling storage: coo...

AI Technical Summary

Problems solved by technology

[0017] (2) Although the production technology of existing milk powder is relatively mature, many powerful manufacturers have adopted advanced four-effect falling film evaporation concentration and vacuum spraying, but the heat source for vaporizing a large amount of water in milk—steam consumption is still Higher; and fan, dust recovery and other ancillary equipment consume more power and cooling water; the drying exhaust temperature is high (75-85°C), the heat loss is large, and the thermal efficiency is low

[0018] (3) It is prone to coking and scaling on the surface of the equipment; milk running, cooling water filling, and milk powder scorching; cleaning and cleaning difficulties, etc.; temperature, heating time, water content, vacuum degree and other process parameters have many influencing factors and are difficult to control. Difficult to operate

Production accidents such as protein denaturation and oxidative browning of milk powder are prone to occur

[0019] (4) The prepared milk powder has relatively poor solubility and brewability

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