The advent of the Ultrasonic Vibrating Screen has completely eliminated the many bottlenecks faced by traditional vibrating screens in screening fine powders, particularly those with high adsorption, prone to agglomeration, and low specific gravity.
Coreal Machinery has compiled some information for your reference.
I. Traditional Challenges in Fine Screening of Traditional Chinese Medicine Powders
1. Material Agglomeration/Clumping: Traditional Chinese medicine powders often contain fiber, sugar, oil, and other components. Fine powders are easily aggregated due to static electricity and moisture adsorption, forming particle clumps that far exceed the screen aperture and clog the screen apertures.
2. Strong Adsorption: Many traditional Chinese medicine powders are light in texture and will firmly adhere to the screen, preventing them from effectively passing through the sieve.
3. Screen Clogging: Fine particles can become lodged in the screen apertures, blocking them and dramatically reducing the effective screening area, leading to a rapid decline in both output and precision.
4. Low Efficiency: To prevent clogging, feed rates may need to be reduced or the machine may need to be frequently shut down for cleaning, significantly reducing production efficiency.
5. Substandard accuracy: Due to clogging and agglomeration, many qualified particles that should be screened out are unable to pass through, resulting in a high content of qualified particles in the screened material. Furthermore, the screened material may be mixed with large, unqualified particles due to screen damage or poor edge sealing, ultimately affecting product quality.
II. How does ultrasound accurately solve the problem of Chinese medicine powder screening?
1. Resolving Agglomeration and Adsorption Issues
High-frequency ultrasonic vibrations break down the surface adsorption between powder particles, allowing agglomerated particles to fully disperse. Lightweight powders no longer adhere to the screen, but instead "jump" and sift through more easily.
2. Eliminating Screen Clogging
This is the most significant advantage of ultrasound. Tens of thousands of micro-vibrations per second prevent particles from becoming lodged or embedded in the screen mesh, significantly reducing the chance of clogging, keeping the mesh clear, and ensuring a continuously effective screening area. The screen appears to be "self-cleaning." High-performance vibrating screens offer continuous operation for extended periods without requiring downtime for cleaning.
3. Significantly Improved Screening Accuracy and Efficiency
High Accuracy: The screen remains continuously unobstructed, ensuring that all particles smaller than the mesh size have an equal opportunity to pass through, effectively preventing "coarse runaway" and achieving screening accuracy exceeding 95%, with fineness reaching up to 500 mesh or finer.
High Efficiency: No clogging ensures faster screening, increasing output by 1-10 times compared to conventional vibrating screens and allowing for higher feed rates, enabling efficient and continuous production.
4. Improved Working Environment and Material Protection
Smooth screening effectively controls dust generation, improving the operating environment. Ultrasonic waves are low-amplitude mechanical waves that do not damage the physical properties of the material, making them ideal for protecting the active ingredients in traditional Chinese medicine.
III. Application Scenarios
1. Ultra-fine powders: Ganoderma lucidum spore powder, pollen, Panax notoginseng ultrafine powder, pearl powder, etc.
2. Prone to agglomeration: Medicinal powders with high sugar content and oil content.
3. Light specific gravity powders: Dandelion powder, mint powder, etc.
4. High-value medicinal materials: Any waste in these materials increases costs, and ultrasonic screening maximizes yield.
Coreal Machinery is committed to providing you with high-quality screening equipment and industry solutions.