Why does the LED industry use planetary centrifugal mixers?

Planetary centrifugal mixers have many important applications in the LED industry, mainly reflected in the following aspects:

Fluorescent powder mixing:

High requirements for mixing uniformity: In LED manufacturing, the uniform distribution of fluorescent powder is crucial for the luminous effect and color consistency of the LED. The planetary centrifugal mixer, with its powerful centrifugal force and unique mixing method, can fully disperse the fluorescent powder in the glue or packaging material, avoiding situations where the local concentration is too high or too low, ensuring that the light emitted by the LED is uniform in color and stable in brightness. For example, in the production of white LED, it is necessary to evenly mix yellow fluorescent powder with the blue light emitted by the blue LED chip to produce white light. The planetary centrifugal mixer can effectively accomplish this task and improve the quality of white LED.

Prevent the precipitation of fluorescent powder: The density of fluorescent powder is usually different from that of carrier materials such as glue, which can easily cause precipitation during the mixing process. The high-speed rotation and complex motion trajectory of the planetary centrifugal mixer can effectively overcome the influence of gravity, maintain the suspension state of the fluorescent powder, and maintain the stability of the mixed system for a long time, ensuring that the fluorescent powder can always be evenly distributed around the LED chip during the packaging process.

Glue mixing and defoaming:

Uniform mixing of glue: During the LED packaging process, glue is needed to bond the chip and bracket components together. The uniformity of glue mixing directly affects the quality and reliability of the packaging. The planetary centrifugal mixer can achieve a highly uniform mixing state of the adhesive in a short period of time, ensuring consistent performance of the adhesive in various parts and improving the bonding strength and sealing of the packaging.

Efficient defoaming treatment: The adhesive is prone to air bubbles during the mixing process, which can affect the performance and appearance of the LED. The planetary centrifugal mixer uses centrifugal force to separate bubbles from the glue and discharges them through a special stirring action, thereby achieving efficient defoaming effect. After defoaming treatment, the adhesive can better fill gaps during the packaging process, reduce defects caused by the presence of bubbles, and improve the yield of LEDs.

Preparation of packaging materials:

Mixing of multiple materials: LED packaging materials are usually composite materials composed of multiple components, such as epoxy resin, silicone, additives, etc. The planetary centrifugal mixer can thoroughly mix these materials with different properties to form a uniform encapsulation material system. For example, in the preparation of packaging materials with special properties, precise control of the proportion and distribution of various additives is required, and planetary centrifugal mixers can meet this high-precision mixing requirement.

Material performance optimization: Through the stirring effect of the planetary centrifugal mixer, the molecular structure of the packaging material can be made more uniform, improving the physical and chemical properties of the material. For example, improving the hardness, toughness, and aging resistance of packaging materials can extend the service life of LEDs.

Mixing of conductive materials such as silver paste:

Ensure conductivity: During the electrode manufacturing process of LED, conductive materials such as silver paste need to be used. The particle size, shape, and distribution of these conductive materials have a significant impact on the conductivity of electrodes. The planetary centrifugal mixer can evenly disperse the particles in the silver paste in the solvent, avoiding particle agglomeration and ensuring the conductivity and stability of the conductive material. At the same time, the stirring parameters can be adjusted as needed to control the viscosity and flowability of the silver paste, making it more suitable for electrode printing or coating processes.

Improve production efficiency: Compared with traditional mixing equipment, planetary centrifugal mixers have faster mixing speed and higher efficiency, and can complete the mixing process of conductive materials in a short time, meeting the large-scale and high-efficiency requirements of LED production.