In the fields of precision manufacturing such as electronic packaging, new energy, and composite materials, the uniformity and non foaming properties of materials directly determine product performance - epoxy resin bubbles can cause leakage in chip packaging, lithium battery slurry bubbles can cause uneven electrode coating, andMaterial mixing and defoaming machineIt is the key equipment to solve this core problem. Its working mechanism is not simply a combination of "stirring+vacuuming", but a synergistic effect of "mechanical mixing+environmental regulation" to achieve the integration of material homogenization and defoaming. The core principle revolves around two dimensions: stirring dynamics and defoaming thermodynamics.

The core principle of the mixing system is the combined effect of laminar shear and turbulent diffusion, ensuring that the material achieves micro uniform mixing. The stirring blade of the defoamer adopts a customized structural design, which is divided into anchor type, blade type, planetary type and other types according to the difference in material viscosity. For low viscosity inks (viscosity<1000mPa · s), a high-speed rotating blade type stirring head is used to form strong turbulence at a speed of 1000-3000r/min, and the fluid inertia is used to rapidly diffuse and fuse different components; For high viscosity silicone (viscosity>10000mPa · s), a planetary stirring structure is used, where the stirring head rotates around its own axis and the center of the container, generating axial and radial composite shear forces to break the "agglomeration effect" of high viscosity materials and achieve uniform mixing at the particle level.

During the stirring process, the blade design of the stirring blade is particularly critical - using a "circular arc transition+serrated efficiency enhancement" structure can not only avoid the generation of new bubbles during high-speed rotation, but also break the existing small aggregates in the material through blade cutting force. At the same time, the built-in speed closed-loop control system of the device will automatically adjust the speed according to changes in material viscosity. For example, in the stirring of lithium battery positive electrode slurry, when the viscosity is high in the initial stage, it is dispersed at a low speed of 500r/min. As the viscosity decreases after uniform mixing, the speed gradually increases to 2000r/min to ensure that the entire process operates under the stirring parameters.

The core principle of the defoaming system is "bubble expansion, buoyancy, and rupture in a vacuum environment", which accelerates the removal of bubbles using thermodynamic and fluid mechanics laws. The bubbles in the material are significantly affected by air pressure. Under the action of a vacuum system, the pressure inside the stirring chamber drops from standard atmospheric pressure to -0.095MPa. The internal air pressure of the bubbles is higher than the external environment, and they will rapidly expand to more than 10 times their original volume, resulting in a significant increase in bubble buoyancy. At the same time, the fluid circulation generated during the stirring process provides an upward power channel for the bubbles. The expanded bubbles will quickly float up to the surface of the material along the vortex streamline formed by stirring, and eventually rupture and be evacuated by the vacuum system.

For difficult to remove small bubbles (diameter<10 μ m), the device will enhance the defoaming effect through "ultrasonic assistance" - integrating ultrasonic oscillators on the outer wall of the stirring chamber to generate high-frequency vibrations of 20-40kHz. The vibration energy is transmitted to the inside of the material, causing the small bubbles to resonate and fuse with each other, forming large bubbles that can be captured by the vacuum system. This composite defoaming mode of "vacuum+ultrasound" improves the efficiency of defoaming by more than 40% compared to a single vacuum defoaming mode, especially suitable for materials such as epoxy resin for semiconductor packaging that have strict requirements for bubbles.

The collaborative control of mixing and defoaming is the core guarantee for the efficient operation of equipment, and the two are precisely linked through a PLC system. After the equipment is started, low-speed stirring and dispersion should be carried out first, and the vacuum system should be synchronously turned on after 30 seconds to avoid the initial stage of high-speed stirring involving a large amount of air; When the vacuum degree reaches the set value, the stirring speed gradually increases to the target value, and the fluid motion generated by stirring accelerates the upward movement of bubbles; In the later stage of defoaming, reduce the speed to 500r/min, maintain slight stirring to prevent material precipitation, and maintain a vacuum state for 1-2 minutes to ensure the removal of residual bubbles. Throughout the process, pressure sensors and speed sensors provide real-time feedback data to achieve dynamic parameter optimization.

The differences in the characteristics of different materials have put forward personalized requirements for the parameter settings of principle implementation. For example, when stirring electronic adhesives, the vacuum degree should be controlled at -0.085MPa to avoid component volatilization; The ceramic slurry needs to increase the vacuum degree to -0.098 MPa and extend the stirring time to 15 minutes to ensure sufficient bonding between the particles and the base liquid. The principle design of the stirring defoamer is based on this "universal mechanism+precise adaptation" mode, which achieves efficient processing of materials with different viscosities and components.

The core principle of the material mixing and defoaming machine, from the mechanical mixing of agitation to the thermodynamic control of defoaming, constructs a dual guarantee system of "homogenization+defoaming". This technological path of multi physics field synergy not only solves the pain point of "uneven mixing" in traditional mixing equipment, but also becomes the core support for improving product quality and ensuring production stability in the field of precision manufacturing, providing reliable equipment guarantee for new material applications and product upgrades.