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Principle of plastic color mixing machine
A mixer is a machine that uniformly mixes two or more materials using mechanical force and gravity. Color mixing machines are widely used in various industries and daily life.
The color mixer can mix various materials into a uniform mixture, such as mixing cement, sand, crushed stone, and water into wet concrete materials; It can also increase the contact surface area of materials to promote chemical reactions; It can also accelerate physical changes, such as adding solvents to granular solutes, and accelerating dissolution and mixing through the action of mixing machinery.
Commonly used color mixers are divided into four categories: gas and low viscosity liquid mixers, medium and high viscosity liquid and paste mixing machines, thermoplastic material mixers, and powder and granular solid material mixing machines. Gas and low viscosity liquid color mixing machines are characterized by simple structure, no rotating parts, small maintenance and low energy consumption. This type of mixing machinery is further divided into four types: air flow mixing, pipe mixing, jet mixing, and forced circulation mixing.
Color mixing machines for medium and high viscosity liquids and pastes generally have strong shearing effects; Thermoplastic material mixer is mainly used for mixing thermoplastic materials (such as rubber and plastics) with additives; Mixing machines for powdery and granular solid materials are mostly operated intermittently, and also include machines that have both mixing and grinding functions, such as wheel rolling machines. When mixing, it is required that all materials involved in mixing be evenly distributed. The degree of mixing can be divided into three states: ideal mixing, random mixing, and complete 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, air currents, and jets of liquid to be mixed, which agitate the materials to be mixed to achieve uniform mixing. "Agitation causes a portion of the liquid to flow, and the flowing liquid in turn pushes the surrounding liquid, resulting in a circulating liquid flow within the dissolver. The resulting diffusion between liquids is called main body convective diffusion.". When the liquid flow velocity caused by agitation is very high, shear action occurs at the interface between the high-speed liquid flow and the surrounding low-speed liquid flow, resulting in a large number of localized vortices. These vortices quickly spread around and bring more liquid into the vortex. The turbulent convective diffusion formed in a small range is called eddy diffusion.
The mixing mechanism of a small amount of insoluble powdery solids and liquids is different from the density component, and the mixing mechanism of immiscible liquids is the same, except that stirring cannot change the particle size of the powdery solids. "If solid particles cannot settle faster 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 pastes mainly involves repeatedly dividing the materials to be mixed and subjecting them to strong shearing effects caused by actions such as pressing, rolling, and squeezing, followed by repeated merging and kneading to achieve the desired mixing level. This kind of mixing is difficult to achieve ideal mixing, and can only achieve random mixing. After mixing a powder solid with a small amount of liquid, it becomes a paste, and its mixing mechanism is the same as that of paste materials.
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