Author: Site Editor Publish Time: 10-10-2026 Origin: Site
Introduction
Before designing a milk powder production line, equipment suppliers need more than just information on the product type and the required hourly output.
The equipment configuration, energy consumption, facility height, investment scale, and final product quality of a production line depend on factors such as the product type, raw material composition, production capacity, product specifications, utility requirements, facility conditions, and regulations in the target market.
At a minimum, the client needs to provide the following eight categories of information:
1. Type of milk powder to be produced
2. Raw material composition and supply conditions
3. Specific production capacity and operating schedule
4. Product quality and functional specifications
5. Scope of supply for the production line
6. Existing plant utilities
7. Project location and facility conditions
8. Packaging, regulatory, and acceptance requirements
If this information is incomplete, the supplier can only provide a preliminary budget estimate rather than a final process design and an accurate quotation.
"Milk powder" is not a sufficiently specific product name for selecting the appropriate processing equipment.
The project must clearly specify which of the following products is to be produced:
• Whole milk powder
• Skimmed milk powder
• Partially skimmed milk powder
• High-fat milk powder
• Formulated milk powder
• Vegetable fat-filled milk powder
• Instant milk powder
• Standard (non-instant) milk powder
• Infant formula powder
• Whey powder
• Milk protein powder
• Other dairy-based powders
Different products cannot share the same process design without specific adjustments.
Whole milk powder production requires control over milk fat standardization, homogenization, oxidation, and storage stability.
Skimmed milk powder production focuses more on protein state, heat treatment intensity, solubility, and bulk density.
Instant milk powder requires additional processes such as agglomeration, fluidized bed treatment, and surface treatment.
Vegetable fat-filled milk powder involves systems for fat storage, emulsification, ingredient blending, and homogenization.
Infant formula powder imposes stricter requirements regarding ingredient dosing accuracy, hygienic zoning, cross-contamination control, and powder handling; it cannot be designed based on a standard whole milk powder production line.
Therefore, the client must first provide the specific product name, formulation type, and target market. The Codex Alimentarius Commission specifies different compositional ranges for whole milk powder, partially skimmed milk powder, skimmed milk powder, and cream powder; this is why a project cannot simply specify "milk powder."
Production lines cannot be designed based solely on standard milk composition; actual data for the specific raw materials to be used is required.
The customer needs to provide the following information:
• Raw material type (e.g., fresh milk, skimmed milk, concentrated milk, or reconstituted milk)
• Total solids content
• Fat content
• Protein content
• Lactose content
• Ash content
• Acidity
• Density
• Feed temperature
• Microbiological parameters
• Thermal stability
• Potential impurities
• Compositional variations across different seasons
Raw material composition directly determines the yield of the finished product.
Milk powder yield can be preliminarily calculated using the following formula:
Milk powder yield = Raw material flow rate × Raw material total solids × Solids recovery rate ÷ Milk powder solids content
For example, when processing 10,000 kg of fresh milk per hour—with a raw material total solids content of 12.5%, a finished product moisture content of 4%, and a solids recovery rate of 98%—the theoretical milk powder yield is approximately 1,276 kg/h.
If the raw material total solids content drops to 11.5% while other conditions remain constant, the milk powder yield becomes approximately 1,174 kg/h.
A change in raw material solids content alone results in a yield difference of approximately 100 kg/h.
Therefore, customers should not provide only average values; they should also provide composition ranges for peak seasons, off-seasons, and extreme scenarios, enabling the supplier to calculate equipment capacity based on worst-case operating conditions.
Without actual raw material test reports, the supplier can only provide estimates and cannot guarantee the final yield.
"Fifty tons per day" or "one ton per hour" does not constitute a complete specification of production capacity.
The client must specify exactly what the capacity refers to:
• Hourly raw milk processing capacity
• Daily raw milk processing capacity
• Hourly concentrated milk feed rate
• Hourly milk powder output
• Daily milk powder output
• Hourly water evaporation rate of the evaporator
• Hourly water evaporation rate of the spray dryer
These figures are not interchangeable.
When designing spray drying equipment, a key parameter determining the actual equipment size is the hourly water evaporation rate, not the milk powder output itself.
For the same milk powder output, if the solids content of the concentrated milk entering the spray dryer varies, the required water evaporation rate changes; consequently, the equipment size, thermal energy consumption, and exhaust airflow requirements will also differ.
Evaporation and concentration constitute a crucial stage prior to spray drying; the primary function is to remove the majority of the water beforehand, thereby reducing energy consumption during the subsequent drying process.
It is also necessary to clarify:
• Daily operating hours
• Days of production per week
• Planned operating days per year
• Duration of a single continuous production run
• Duration required for each cleaning cycle
• Whether there are peak periods for raw material supply
• Whether capacity for future expansion needs to be included
• Whether multiple types of milk powder are produced simultaneously
If the project requires twenty hours of production per day, the daily output cannot be calculated based on twenty-four hours of continuous equipment operation.
If frequent product switching and cleaning are required, the equipment's rated output cannot simply be taken as the actual daily output.
Even for the same type of milk powder, equipment configurations may differ significantly.
The following finished product specifications must be clearly defined:
• Moisture content
• Fat content
• Protein content
• Bulk density
• Tapped density
• Particle size range
• Solubility
• Dispersibility
• Wettability
• Flowability
• Insolubility index
• Scorched particle requirements
• Microbiological specifications
• Color and flavor
• Agglomeration requirements
• Instantization requirements
• Dust reduction requirements
• Target shelf life
These specifications influence the equipment used for preheating, concentration, homogenization, atomization, spray drying, fluid bed processing, sieving, and packaging.
For instance, producing instant milk powder—which requires coarser particles, good flowability, and easy reconstitution—calls for agglomeration and fluid bed processing.
Conversely, producing standard milk powder—which requires finer particles and higher bulk density—requires different atomization and drying conditions.
When selecting spray drying equipment, one should not choose a model first and then determine the milk powder's properties; the correct approach is to first define the target powder characteristics, then select the drying method and atomization system.
If a customer lacks their own technical specifications for the finished product, they should provide a market-accepted reference sample, allowing the supplier to establish preliminary specifications based on the analysis of that sample.
Production line design goes beyond the pasteurization or evaporation stages; it must also account for the method of raw material intake.
The customer should specify:
• Whether raw milk is delivered via tanker, milk can, or pipeline
• Frequency of daily deliveries
• Quantity per delivery
• Temperature of raw milk upon arrival
• Whether pre-cooling has already taken place at the farm
• Time required for tanker unloading
• Requirements for filtration, metering, and sampling
• Need for raw milk cooling
• Required storage duration for raw milk
• Availability of existing raw milk storage tanks
• Need for multiple raw milk storage tanks
• Requirements for handling skimmed milk, cream, or other by-products
If raw material deliveries are concentrated within a short timeframe, the intake and storage systems must be designed based on peak delivery rates rather than the average daily processing volume.
Without a raw milk delivery schedule from the customer, the supplier cannot accurately determine the required unloading capacity, cooling capacity, and number of storage tanks.
A "complete milk powder production line" can represent vastly different scopes in quotations from different suppliers.
The customer must specify exactly where the production line begins and ends.
Common scopes of supply include:
• Raw milk reception
• Raw milk cooling and storage
• Milk clarification and separation
• Fat and protein standardization
• Pasteurization
• Homogenization
• Evaporation/concentration
• Concentrated milk storage
• Spray drying
• Fluidized bed processing
• Powder cooling
• Sieving
• Metal detection
• Powder buffer storage
• Conveying
• Packaging
• Palletizing
• Cleaning-in-Place (CIP)
• Control systems
• Steam systems
• Cooling systems
• Compressed air systems
• Water treatment
• Dust collection and explosion protection systems
• Wastewater treatment
• Laboratory
• Finished product warehouse
If the customer requires only the core process equipment, it should be clearly specified which auxiliary systems will be handled by local suppliers.
If a complete turnkey project is required, the scope of supply must include utilities, facility interfaces, installation, commissioning, training, and performance acceptance.
Quotations without clearly defined supply boundaries cannot be directly compared.
Milk powder production lines require significant amounts of thermal energy, water, electricity, cooling capacity, and compressed air. Suppliers must design systems based on actual site conditions rather than relying on default options; the following information is required:
Steam
• Available steam pressure
• Steam temperature
• Maximum continuous supply rate
• Boiler fuel type
• Boiler status (existing or to be built)
• Steam quality
• Condensate recovery status
Insufficient steam pressure can compromise sterilization, evaporation/concentration, and cleaning capabilities.
Electricity
• Grid voltage
• Grid frequency
• Three-phase power specifications
• Maximum allowable installed power
• Backup power generation capacity
• Local power grid stability
Precise voltage and frequency data are essential for the final selection of motors, control cabinets, and electrical components.
Process Water
• Water source
• Water quality analysis report
• Available water volume
• Supply pressure
• Inlet water temperature
• Treatment requirements (softening, filtration, etc.)
• Compliance with food-grade water standards
In dairy plants, water is used not only for production but also for cleaning, cooling, and equipment pre-treatment. Water consumption varies significantly depending on the cleaning methods and water recovery strategies employed.
Cooling Conditions
• Cooling water supply temperature
• Cooling water return temperature
• Chilled water or other refrigerant temperature
• Ambient wet-bulb temperature
• Cooling tower capacity
• Existing refrigeration system status
Compressed Air
• Available pressure
• Maximum air supply rate
• Air purity level
• Dew point requirements
• Direct product contact status
Wastewater Treatment
• Permitted plant discharge volume
• Wastewater treatment capacity
• Discharge standards
• Permission to discharge high-concentration dairy wastewater
• Cleaning effluent disposal method
• Evaporator condensate recovery status
If on-site utility capacities are insufficient, the expansion of boiler, refrigeration, water treatment, or wastewater treatment facilities must be included in the project investment; these issues cannot be deferred until the equipment arrives on-site.
Spray drying systems are large in size and involve high air volumes; consequently, they have specific requirements regarding facility height and installation conditions.
The client is required to provide the following information:
• Project country and city
• Site elevation (altitude)
• Annual maximum and minimum temperatures
• Annual humidity range
• Rainy and dry season conditions
• Site master plan
• Available building floor area
• Available facility height
• Floor and roof load-bearing capacities
• Column grid dimensions
• Equipment lifting/hoisting access
• Transport vehicle access conditions
• Air intake and exhaust locations
• Drainage channels and floor slopes
• Locations of raw material, wet processing, and powder handling areas
• Whether the project involves a new plant or the renovation of an existing facility
Elevation and ambient temperature/humidity affect air density, drying capacity, exhaust air volume, and the risk of moisture absorption in the finished product.
For renovations of existing facilities, accurate architectural drawings and on-site measurements must be provided. One cannot finalize the spray drying equipment selection before verifying whether the facility can accommodate it.
If the facility height is insufficient, the project may require adjustments to the equipment type, layout modifications, or the construction of a dedicated drying tower section.
Packaging equipment is not merely an add-on installed after the production line design is finalized.
The client must clarify the following:
• Packaging type: industrial bulk bags or small retail packs
• Net weight per bag
• Bag material
• Requirement for inner liners
• Requirement for nitrogen flushing
• Packaging throughput (bags per hour)
• Requirement for automatic bag feeding
• Requirement for bag sealing and stitching
• Requirement for metal detection
• Requirement for checkweighing
• Requirement for date/batch coding
• Requirement for automatic case packing
• Requirement for palletizing
• Method of transferring finished products to the warehouse
If a production line produces several tons of milk powder per hour but the packaging system lacks sufficient capacity, the powder buffer silo will quickly fill up, forcing a shutdown of the entire production line.
Therefore, packaging capacity must exceed the standard powder output rate and provide a buffer to handle short-term fluctuations in production volume.
Milk powder is hygroscopic; therefore, environmental conditions in the finished product storage area must be controlled.
The client should provide:
• Planned storage duration
• Average daily inventory level
• Maximum inventory level
• Warehouse temperature and humidity conditions
• Pallet dimensions
• Number of packages per pallet
• Use of racking systems
• Use of forklifts
• Container loading method
• Finished product shipment frequency
• Requirements for constant temperature or dehumidification
If warehouse humidity is high, moisture-proofing measures for packaging materials and the storage environment must be enhanced.
Without a calculation of the maximum inventory level, it is impossible to properly plan the warehouse area and logistics aisles.
Cleaning systems must be designed concurrently with the production process; they cannot be added as an afterthought once equipment selection is complete.
The client needs to clarify the following:
• Duration of each continuous production run
• Frequency of daily cleaning
• Scope of equipment requiring cleaning
• Whether multiple formulations are produced
• Whether there is a risk of cross-contamination with allergens between formulations
• Whether cleaning fluids are recovered
• Use of hot water, steam, or chemical disinfection
• Acceptable cleaning duration
• Method for verifying hygienic status after cleaning
• Treatment method for cleaning wastewater
The capacity of the Cleaning-in-Place (CIP) system depends on the number of cleaning circuits, the division of hot and cold circuits, the disinfection method, whether cleaning fluids are recovered, and peak steam demand.
If a project involves frequent product changeovers but is configured with only a single shared cleaning circuit, downtime will increase, as will the risk of cross-contamination.
The client should specify the desired level of automation:
• Manual operation
• Semi-automatic control
• Fully automatic control
• Recipe management requirements
• Production batch tracking requirements
• Critical process parameter recording requirements
• Remote fault diagnosis requirements
• Operator interface language
• Number of operators per shift
• Maintenance capabilities of local technical personnel
• Requirements for integration with existing plant systems
Projects involving high labor costs, limited operating staff, or stringent product quality consistency requirements should opt for higher levels of automation.
If local maintenance capabilities are limited, the equipment design should minimize complexity and incorporate comprehensive remote support, spare parts, and training provisions.
Milk powder production generates fine dust. Under certain conditions, milk powder dust is classified as combustible dust; therefore, the design phase must address dust collection, static electricity control, explosion venting, explosion isolation, and equipment grounding. Safety Specifications for Combustible Dust
The client is required to provide:
• Applicable dust safety regulations for the project location
• Requirements for hazardous area classification (explosion-proof zoning)
• Permissible directions for explosion venting
• Conditions regarding personnel and structures surrounding the facility
• Installation location for the dust collection system
• Whether outdoor explosion venting is required
• Explosion-proof requirements for electrical equipment
• Review requirements from local fire authorities
If a supplier's proposal lacks provisions for dust collection, explosion protection, and static electricity control, it cannot be considered a complete design for a milk powder production line.
The milk powder production line should be designed based on the target sales markets, rather than solely according to the requirements of the equipment manufacturer's country.
The customer needs to specify:
• Target countries or regions for sales
• Applicable product standards
• Food hygiene requirements
• Restrictions on ingredients and additives
• Microbiological limits
• Packaging and labeling requirements
• Requirements for product-contact materials
• Pressure vessel requirements
• Electrical safety requirements
• Dust explosion protection requirements
• Factory certification goals
• Export registration requirements
If the product is to be sold in multiple markets, the primary design parameters should be determined based on the market with the strictest requirements.
Formulations, equipment materials, sanitary design, and inspection protocols cannot be finalized until the target markets have been determined.
Technical solutions must align with investment budgets and construction schedules.
The client should clearly define:
• Estimated total investment
• Equipment budget
• Budget for the factory building and utilities
• Planned production start date
• Civil works commencement date
• Equipment installation schedule
• Equipment to be procured internationally
• Equipment to be procured locally
• Responsibility for transportation
• Responsibility for installation
• Responsibility for piping and cabling
• Responsibility for commissioning
• Responsibility for operational training
• Requirement for long-term production support
• Duration of spare parts coverage
If the budget cannot support the target production capacity and product specifications, adjustments should be made to capacity, the level of automation, or the scope of supply; costs must not be cut by compromising critical hygiene and safety configurations.
The design of a milk powder production line does not begin with the selection of equipment models, but rather with the confirmation of project parameters.
Before contacting a supplier, the client should prepare at least the following:
• Product and formulation specifications
• Technical standards for the finished product
• Raw material test reports
• Production capacity and operating schedule
• Raw material delivery plan
• Scope of supply for the production line
• Utility requirements
• Factory and site details
• Packaging and warehousing requirements
• Target market regulations
• Automation and cleaning requirements
• Budget and production launch schedule
• Performance acceptance criteria
The more accurate this information is, the more reliable the equipment configuration, investment budget, and project schedule will be.
If key information has not yet been determined, steps such as product definition, raw material testing, and confirmation of project parameters should be completed first; equipment procurement should not proceed immediately.
