The vacuum homogenizing high shear machine
Oct 19, 2022
1. The genesis of homogenization and emulsification
In the workplace, the oil-water emulsification process is typically finished with the use of an emulsifier to produce the desired dispersion and homogeneity when two immiscible liquids or solid-liquid inclusions are present. It is impossible for the water in oil or oil in water forms of the oil-water two-phase medium to exist stably. To increase the system's surface tension, the proper emulsifiers are required. To break the medium down into tiny particles at the same time, a powerful cutting dispersion is required. Afterward, a stable and uniform dispersion system is created to produce a good emulsification effect.
The use of emulsifying machines is currently not just for emulsifying. The emulsion machine has a powerful shearing effect that can break powder particles under impact, refine to tiny particle size, and then fully mix the solid particles into the liquid to form a comparatively constant suspension. The system can be regarded as homogeneous when the material's fineness approaches the micron or even nanoscale level.
High pressure homogenization can reduce materials to extremely small particles and emulsify and homogenize simultaneously to create stable emulsions. The emulsifier can therefore also be referred to as a homogenization emulsifier.
2. Homogenizer Principle
Shear force and pressure are the homogenizer's principal driving forces. The laminar flow effect is created during the homogenization process, which causes the dispersed phase particles or droplets to be sheared, stretched, and shattered; Under the influence of the turbulence effect, particles or droplets will randomly deform in response to pressure changes; under the influence of the cavitation effect, tiny bubbles will burst quickly in the presence of high pressure, releasing energy and resulting in local hydraulic shock and vibration. The materials are evenly spread as a result of these combined operations.
3. High Shear Emulsifier Principle
The rotor and stator make up the shear head. Together, the rotor and stator mesh. There are multiple layers of gear rings in each stage of the stator and rotor. A strong negative pressure area is created when the rotor rotates quickly to provide a strong centrifugal force. In the stator and rotor gap, the material is drawn into the working chamber where it is subjected to a variety of forces including shearing, centrifugal extrusion, impact tear, turbulence, etc., which results in the tension of splitting droplets. The pressure increases once more after the liquid exits the stator hole, producing the cavitation effect. High-speed rotation of the homogenizing head shears, scatters, and impacts the materials.
When processing granular materials with more fibers or hard materials, a high shear emulsification machine is more appropriate. Homogenization, sterilization, and mixing can all be done simultaneously. With the help of high-shear emulsification technology, developed by Liu Junmei and others, soybean protein was significantly reduced in protein particle size and exposed to hydrophobic groups, which encouraged the formation of gel networks and enhanced the soybean protein isolate gel's ability to hold water. By applying high-speed shear emulsification technology to corn gluten powder, Guo Weijing et al. changed the physical properties of protein powder. This process can significantly reduce particle size, improve rheology and solubility, improve starch degradation rate and protein hydrolysis degree, and successfully inhibit the stratification of fruit and vegetable juice.High shear emulsification machine is widely used in products with high viscosity and high emulsification requirements, such as jam, fruit tea, etc.
