Improving the efficiency of powder screening can be approached from the following aspects:

Material pretreatment

Dry materials: If the humidity of the material is high, it is easy for particles to agglomerate or adhere to the sieve, affecting the screening effect. Reducing material humidity through drying treatment can improve particle dispersion and facilitate sieving. For example, before screening damp flour, it can be dried at low temperature first.

Breaking up agglomerates: For some powders that are prone to forming agglomerates, mechanical or air flow dispersion methods can be used before screening to break down the agglomerates into individual particles, which can improve screening efficiency. When screening pigment powder, you can first use a blender to break up the aggregated pigments.

Choose the appropriate sieve and equipment

Suitable sieve: Select a sieve with accurate mesh size, appropriate shape, and wear-resistant material based on the characteristics of the powder and screening requirements. Shanghai Chaofeng Machinery Equipment can use stainless steel woven mesh for high-precision screening; For coarse sieving with large processing capacity, perforated sieve plates can be used.

Efficient screening equipment: Select suitable screening equipment based on material properties and production requirements. For powders with good fluidity and high yield, vibrating screens can be used; Shanghai Chaofeng Machinery Equipment can choose rotary vibrating screen for fine powder; For powders with high viscosity, an air flow sieve can be used.

Optimize operational parameters

Adjust vibration frequency and amplitude: For vibrating screens, it is necessary to find the optimal combination of vibration frequency and amplitude based on the characteristics of the material and the specifications of the screen mesh. Generally speaking, for fine particle powders, higher frequencies and smaller amplitudes are used; For coarse particle powders, lower frequency and larger amplitude are used.

Control feeding speed: Uniform and appropriate feeding speed is the key to ensuring screening efficiency. If the feeding speed is too fast, it will cause the material to accumulate on the screen surface and not be fully screened in time; If the feeding speed is too slow, it will reduce the output. The feeding speed needs to be adjusted according to the processing capacity of the screening equipment.

Regular maintenance of equipment

Timely cleaning of the sieve: During the screening process, the sieve is prone to blockage or wear from materials and needs to be regularly shut down for cleaning. Backblowing, vibration cleaning, and other methods can be used to remove particles and impurities from the sieve and restore its transparency.

Check equipment components: Regularly inspect various components of the screening equipment, such as vibration motors, springs, etc., to ensure that the equipment is in good operating condition. If any components are damaged, replace them promptly to avoid affecting the screening effect.

Using auxiliary devices

Adding screening aids: Adding an appropriate amount of screening aids, such as talcum powder, magnesium stearate, etc., to the powder can reduce the friction and adhesion between particles, improve the flowability of particles, and thus enhance screening efficiency.

Installation of Ultrasonic Device: Install an ultrasonic device on the sieve to generate high-frequency vibration through the action of ultrasonic waves, preventing particles from aggregating and blocking the sieve holes. It is particularly suitable for screening fine and viscous powders.