Homogenisers
A homogeniser is a machine that forces a liquid through a narrow gap at high pressure to break fat droplets or particles into much smaller, uniform sizes so they stay evenly dispersed. In milk, fat globules naturally rise and form a cream layer. Homogenisation reduces their size so they stay suspended, giving a stable, uniform product with a smoother mouthfeel. The same principle is used to stabilise emulsions and suspensions in many other foods. On a dairy line the homogeniser usually sits within the pasteuriser circuit, where product has been warmed in the regeneration section, because fat must be liquid for homogenisation to work well. On aseptic lines a homogeniser may sit after the heat treatment, in which case it must itself be built to aseptic standards. Most industrial homogenisers are high-pressure piston pumps. Several pistons driven by a crankshaft push product through a homogenising valve, where the sudden pressure drop, turbulence and shear break droplets apart. Single-stage machines use one valve; two-stage machines add a second valve at lower pressure to break up clusters of droplets formed in the first stage. Partial-stream homogenisation treats only the cream portion, which lowers energy use. Other devices such as high-shear mixers, colloid mills and ultrasonic systems are used for some products but are not true high-pressure homogenisers. In food plants homogenisers are used for milk, cream, evaporated and condensed milk, ice cream mix, yoghurt and dessert bases, plant-based drinks, fruit juices and nectars, sauces, dressings, baby food and flavour emulsions. Cost and performance depend on capacity, maximum operating pressure, the number of stages, valve design and wear-part materials, hygienic and aseptic construction, and energy use. Homogenisers are among the most energy-intensive machines on a dairy line, and their valves, seats, pistons and seals wear with use, especially with abrasive products. Maintenance intervals and the cost of spare parts therefore matter as much as the purchase price.
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Buying criteria
Specify the product and target result. Fat content, viscosity, particle content and the droplet size you need decide the operating pressure, number of stages and valve design. Size capacity to the pasteuriser or process line so the homogeniser runs at a steady flow. Consider partial-stream homogenisation if it suits your product, since it lowers energy use. Check construction: hygienic design for cleaning-in-place, and aseptic design if the machine sits after heat treatment on a sterile line. Count the running costs. Energy use, wear-part life for valves, pistons and seals, spare parts availability and service support all affect the cost of ownership. Ask about noise, vibration and foundation requirements as well, and whether the supplier can service the machine and supply wear parts quickly in your region.
Buyers ask
How much does an industrial homogeniser cost?
It depends on capacity, maximum pressure, the number of stages and whether aseptic construction is required. Larger, higher-pressure and aseptic machines cost more. Because homogenisers use a lot of energy and have wear parts that need regular replacement, the cost of power, valves, seals and pistons over the machine's life should be included in any comparison.
Why is milk homogenised?
Milk is homogenised to stop cream from rising to the top. The homogeniser breaks fat globules into much smaller droplets that stay evenly spread through the milk, giving a uniform product with a smoother taste and better stability during its shelf life.
What is two-stage homogenisation?
In two-stage homogenisation the product passes through two valves in series. The first valve, at higher pressure, breaks the fat droplets down; the second, at lower pressure, breaks up clusters of small droplets that form after the first stage. It gives a more stable product, especially for high-fat items like cream.
Where does the homogeniser go on a dairy line?
On a typical milk line the homogeniser is built into the pasteuriser circuit, after the product has been warmed in the regeneration section and before or after final heating. Warm milk homogenises more effectively. On aseptic lines an aseptic homogeniser may be placed after sterilisation.