Over 10,000+ customers' choice, Focus on screening industry 40+ years
The fineness of spirulina powder has clear references at the standards level. T/UNP 138—2026 “Selenium-Enriched Products: Spirulina Powder (Tablets)” adds a fineness requirement of <180 μm for powder products; GB/T 16919—2022 “General Rules for Quality of Edible Spirulina Powder” also lists fineness as one of the physicochemical testing indicators. 180 μm roughly corresponds to 80 mesh, which aligns with the common market specification of “100% passing 80 mesh” for spirulina powder. Standards set the entry threshold, while formulation processes often require a narrower particle-size distribution.
When spirulina powder enters tableting, hard capsule filling or granulation processes, particle-size distribution directly affects powder flowability and compression molding properties. Publicly available research indicates that granulation goals for spirulina include improving flowability, enabling direct tableting and obtaining stable tablets, and dry granulation can improve particle-size distribution and flow behavior. In other words, before granulation or tableting, if the screening stage can narrow the powder’s particle-size distribution to a definable interval, the material state faced by downstream processes becomes more predictable. What screening provides is the distribution condition before entering the formulation stage.
The classification logic of the rotary vibratory sieve is the continuous segmentation of particle-size intervals by multiple screen decks, rather than passage or retention by a single screen deck. The equipment supports 1 to 5 screen deck configurations and can simultaneously complete classification into 2 to 6 particle-size grades. For spirulina powder, this means the upper screen deck can retain oversize particles and agglomerates, the middle screen deck can produce product in the target particle-size interval, and the lower screen deck can allow fine powder to pass through—all three completed simultaneously in one run.
The engineering significance of this segmentation method lies in narrowing the distribution. A single screen deck can only give a binary result of “pass” or “not pass” and cannot control the internal composition of the passing fraction. The multilayer configuration tightens the target interval from both sides: the upper limit is retained by the middle screen deck, the lower limit is controlled by the lower screen deck, and the proportion of particles falling within the interval becomes an adjustable process variable. Gaofu S49 series rotary vibratory sieves achieve screening accuracy of 500 mesh (0.013 mm) and support 1 to 5 screen deck configurations. For the common fineness range of spirulina powder above 80 mesh, the equipment’s operable space is far greater than the entry requirement itself, leaving margin for supplying products with narrower distribution to downstream processes.
If the narrowing of particle-size distribution can only be achieved in the initial stage of a batch, then as apertures are gradually occupied by fine powder and agglomerates and the effective open area declines, the proportion of fine particles passing through the screen decreases and the distribution shifts toward the coarse end. The maintenance of uniformity depends on the stability of the effective open area over operating time.
The bouncing-ball screen-cleaning device continuously applies mechanical intervention on the underside of the screen mesh, breaking the embedding and electrostatic adsorption of algae powder particles in the apertures, so that the open area fluctuates within a workable range rather than declining monotonically. For algae powder batches with higher target mesh counts or stronger adhesion tendencies, an ultrasonic screen-cleaning system can be used as a supplementary option. At the same time, the three-dimensional compound vibration of the rotary vibratory sieve causes material to spread outward along an involute spiral trajectory; particle advancement relies more on the overall loosening and displacement of the material layer, and single impact intensity is relatively dispersed. For algae powder particles that have already completed spray drying, this motion pattern causes relatively low disturbance to particle integrity during classification. A uniform particle-size distribution obtained at the cost of large amounts of secondary fine powder has no practical value in subsequent processes.
The “suitability” of the rotary vibratory sieve in algae powder production lines, at the executable level, is a set of interface conditions. In terms of materials, material-contact parts use 304 or 316L stainless steel with mirror-polished surfaces to Ra ≤0.4 μm, and seals are food-grade silicone, meeting GMP requirements for equipment with no hygiene dead corners and easy cleaning. In terms of structure, the fully enclosed screen box separates the screening space from the workshop environment, and the quick-release screen allows screen replacement to be completed within 3 to 5 minutes, providing time conditions for batch switching and screen cleaning. In terms of operating parameters, adjusting the phase angle of the upper and lower eccentric weights can change the material’s motion trajectory and residence time on the screen surface, and the combination of amplitude and frequency allows the equipment to avoid running with fixed parameters when facing algae powder batches with differences in moisture content and particle-size distribution.
These conditions jointly serve one goal: making “the proportion of particles falling within the target interval” a process output that can be repeated from batch to batch, rather than a random result dependent on operator experience. For nutritional powder processing that treats particle-size consistency as a precondition for formulation, the value of the screening stage lies not in claiming to eliminate all particle-size fluctuations, but in constraining fluctuations within a narrower, more predictable interval. Gaofu Machinery’s multilayer classification configuration, screen-cleaning mechanism and food-grade structural design on the rotary vibratory sieve provide exactly this kind of interval control means with clear boundaries and parameter basis.
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About Gaofu
Xinxiang Gaofu Machinery Co., Ltd. was founded back in the 1980s. With over 40 years of development, it has been certified as a National-level Specialized, Refined, Unique & Innovative Little Giant Enterprise, National Green Factory, National High-tech Enterprise, and National Intellectual Property Advantage Enterprise, and serves as the President Unit of China Vibration Screening Industry Association.
The company is accredited with the Henan Provincial Industrial Design Center, Henan Provincial Engineering Technology Research Center for Intelligent On-line Screening System, and Xinxiang Municipal Engineering Technology Research Center for Fine Screening.
Gaofu has obtained more than 500 patents including invention patents, utility model patents and design patents, been awarded the Science and Technology Achievement Prize issued by the Ministry of Industry and Information Technology of China, and participated in drafting and formulating 4 national standards.
Gaofu's product portfolio covers multiple series and hundreds of specifications, including vibrating screening equipment, conveying equipment, coal crushing equipment, filtration equipment and automatic material handling systems.
Core products include vibrating screens, screening machines, vibratory sifters, rotary vibrating screens, ultrasonic vibrating screens, linear vibrating screens, airflow screens, gyratory screens, roller screens, dewatering screens, bar screens, vacuum feeding machines, dust-free feeding stations, bulk bag feeding stations, feeding systems, automatic powder feeding systems, automatic slag-discharging filters, leaf filters, clay filters, toothed roll crushers, coal crushers and other machinery.
These products are widely applied in food, pharmaceutical, chemical, metallurgy, construction materials, mining, thermal power, environmental protection and many other industries, winning recognition and trust from over 10,000 clients worldwide.
Gaofu products enjoy strong sales across Greater China, and are exported to more than 100 countries and regions such as Russia, Canada, the United States, New Zealand, Japan, Brazil and South Africa.
Upholding the corporate mission of Improving material quality & efficiency to fully satisfy customer demands, Gaofu maintains long-term partnerships with clients to achieve win-win development.
At present, Gaofu is an official qualified supplier for numerous Fortune Global 500 enterprises, including CNPC, Sinopec, Sinochem Holdings, China Resources Group, Sinopharm Group, COFCO, China National Building Material, China Aerospace Science and Technology Corporation, Jinchuan Group and more.
Gaofu Machinery ranks No.1 in global sales volume of vibrating screens.
In May 2024, Frost & Sullivan, a world-renowned international consulting firm, issued a Market Position Verification Certificate confirming that Gaofu achieved the world's largest shipment volume of vibrating screens in the global market in 2023.
