The former refers to heating fresh milk to 75℃ to 80℃, killing pathogenic microorganisms by maintaining sterilization, retaining beneficial bacteria, and fully maintaining the nutrition and freshness of fresh milk. Its advantage is less damage to nutrients, and its disadvantage is short storage time.
The latter refers to instant sterilization at a temperature of 135℃ to 150℃ for 4 to 15 seconds, completely destroying the microorganisms and spores that can grow in it. Its advantage is that milk can be stored for a long time at room temperature, and its disadvantage is that high temperature destroys many nutrients.
Milk collection system → inspection → storage → milk purification → cream separation → batching → homogenization → sterilization → filling.
1. Milk collection system
The milk collection system consists of filters, flow meters (milk troughs), heat exchangers, pre-degassing machines and other equipment, which mainly perform metering (weighing), cooling, primary filtration, degassing and other treatments on raw milk. Refrigerated milk storage tanks are suitable for storing and cooling freshly squeezed milk or goat milk in ranches, and can also be used for storing and cooling liquid materials in small milk collection stations, dairy processing plants, and food, feed, and pharmaceutical factories.
2. Standardized equipment
Standardized equipment mainly includes preheating systems, cream separators (milk purifiers), high-shear emulsifiers, homogenizers, pasteurizers and other equipment.
Main working process:
a. Preheating: The preheating temperature is about 50℃-55℃.
b. Milk purifier: Remove impurities from milk.
c. Cream separation: Separate fat that exceeds standard requirements.
d. Add dry matter or concentrate: If the total milk solids are lower than the standard, dry matter should be added or concentrated.
e. Pasteurization: The sterilization conditions are required to be 80℃-90℃, 15 seconds.
f. Cooling: Cool the milk to 1-8℃ with ice water through a heat exchanger.
3. Plate sterilization system
The plate sterilizer uses an aseptic plate heat exchange system and cooperates with PLC's high-precision product/water temperature difference control to achieve continuous production of heating, heat exchange, sterilization (60-120°), insulation, and cooling according to user process requirements.
Equipment composition: material pump, balance barrel, hot water system temperature control and recorder, temperature holding tank, cleaning machine, PLC control system, etc.
Required equipment includes: steam generator, ice water unit, air compressor, water purifier.
4. CIP cleaning system
The CIP cleaning system usually consists of a cleaning tank, acid and alkali liquid tank, cleaning pump, return pump, detection system, control system, distributor, etc.
According to the cleaning tank, it can be divided into four-tank type (acid, alkali, hot water, clean water), three-tank type (acid, alkali, hot water), two-tank type (acid, alkali), single-tank type (hot water), one-piece type, split type, etc.;
According to the number of processes, it can be divided into single-channel cleaning, double-channel cleaning, three-channel or multi-channel cleaning;
According to the control method, it can be divided into fully automatic, semi-automatic, etc.
5. Bag filling machine
Common packaging styles for milk include three-side sealing, back sealing, suction nozzle bag and other packaging forms. The packaging capacity can be customized from 50-1000ml, with a wide range of applications. The heat sealing temperature can be automatically controlled, the packaging is exquisite and flat, and the entire packaging process includes film sterilization, bag making, printing date, filling, sealing, cutting, counting, etc.