Shanghai Xiangshun Pharmaceutical Machinery Co., Ltd. has advanced processing technology and equipment, strong technical strength, complete product specifications, and is widely used in industries such as pharmaceuticals, food, chemicals, batteries, electronics, and magnetic materials. The company strictly produces pharmaceutical machinery in accordance with the national GB20022-2004 standard and IPT.UE standard. With the quality and excellent service of *, it enjoys a great reputation in the industry.
The commonly used mixers are divided into four categories: gas and low viscosity liquid mixers, medium high viscosity liquid and paste mixing machines, thermoplastic material mixers, and powder and granular solid material mixing machines.
The characteristics of mixing machinery, gas and low viscosity liquid mixers are simple structure, no rotating parts, low maintenance and repair, and low energy consumption. This type of mixing machinery is divided into four types: air flow mixing, pipeline mixing, jet mixing, and forced circulation mixing.
Paste mixing machinery generally has strong shear force when mixing medium and high viscosity liquids and pastes.
Thermoplastic material mixing machinery is mainly used for mixing thermoplastic materials (such as rubber and plastic) with additives; Powder and granular solid material mixing machinery is mostly operated intermittently, including machinery that also has mixing and grinding functions, such as wheel rollers.
When mixing, it is required that all materials involved in the mixing be evenly distributed. The degree of mixing can be divided into three states: ideal mixing, random mixing, and non mixing. The degree of mixing of various materials in a mixing machine depends on factors such as the proportion, physical state, and characteristics of the materials to be mixed, as well as the type of mixing machine used and the duration of the mixing operation.
The mixing of liquids mainly relies on mechanical agitators, airflow, and jets of the liquid to be mixed, which stir the material to achieve uniform mixing. Stirring causes some liquid to flow, and the flowing liquid then pushes the surrounding liquid, resulting in a circulating liquid flow in the solvent. The diffusion between the resulting liquids is called main convection diffusion. When the liquid flow velocity caused by agitation is high, shear action occurs at the interface between high-speed liquid flow and surrounding low-speed liquid flow, resulting in a large number of localized vortices. These vortices quickly spread outwards and draw more liquid into them, forming turbulent convective diffusion in a small area called vortex diffusion.
The moving parts of a mechanical mixer also produce shear effects on the liquid during rotation. When the liquid flows through the wall of the mixer and various fixed components installed in the container, it also experiences shear effects, which can cause many local vortex diffusion.
For liquids with different densities, compositions, and immiscibility, the shear effect and strong turbulence generated by stirring tear the high-density liquid into small droplets and evenly disperse them into the main liquid. The flow velocity of the liquid generated by stirring must be greater than the settling velocity of the droplets.
Solid material mixing machinery, the mixing mechanism of a small amount of insoluble powder solid and liquid is the same as that of immiscible liquids with different density components, except that stirring cannot change the particle size of the powder solid. If the solid particles cannot settle at a velocity lower than the flow velocity of the liquid before mixing, no matter what stirring method is used, a uniform suspension cannot be formed.
The mixing of different paste like substances is mainly achieved by repeatedly dividing the materials to be mixed and subjecting them to strong shear effects such as compression, rolling, and squeezing, followed by repeated merging and kneading to achieve the required mixing degree. This kind of mixing is difficult to achieve ideal mixing and can only achieve random mixing. After mixing powdered solid with a small amount of liquid, it becomes a paste like substance, and its mixing mechanism is the same as that of paste like materials.
Different thermoplastic materials, as well as the mixing of thermoplastic materials with small amounts of powdered solids, require strong shear action and repeated kneading and kneading to achieve random mixing.
Common mixers include: horizontal pear knife mixer, double screw belt screw belt mixer, double planetary mixer, horizontal gravity free mixer, V-type mixer, double spiral cone mixer, dry powder mixer, planetary power mixer, etc.