Over 10,000+ customers' choice, Focus on screening industry 40+ years
Spirulina powder has a relatively low specific gravity. In conventional screening equipment that is open or inadequately sealed, fine powder escaping outward under vibration is a fairly common phenomenon. The consequences are twofold: suspended algae powder in the workshop air increases, raising the pressure on cleanliness management of the working environment; and material is lost in the form of dust, directly reflected in yield loss.
The enclosed design of the rotary vibratory sieve targets precisely this escape path. Food-grade silicone sealing rings are fitted at the screen frame connections and discharge outlets, and quick-release clamp rings lock them in place, keeping the screening chamber airtight during operation and physically blocking the channels through which fine powder would escape. Material-contact parts are made of 304 stainless steel, and sealing components use non-toxic, odorless food-grade silicone to prevent aging and detachment of non-metallic parts from contaminating the material. By tightening both directions at once—“dust does not escape, foreign matter does not enter”—the cleanliness boundary of the screening stage is placed inside the equipment structure, rather than relying on workshop-level dust removal for after-the-fact remediation.
The degradation of nutritional active ingredients is usually not the result of a single factor. Taking phycocyanin as an example, temperature, light and pH all fall within the variables discussed for its stability, and light-avoiding conditions below 45 °C are considered a relatively favorable range. Screening itself does not introduce high temperatures, but a non-enclosed screen continuously exchanges air with the workshop during operation, and the contact area between the material and air increases significantly as the powder tumbles and is thrown on the screen surface; an open or semi-open screen body also makes it difficult to isolate ambient light.
While cutting off dust escape, the fully enclosed structure of the rotary vibratory sieve also forms a physical barrier between the material and the external environment. Once the screening chamber is closed, the algae powder is no longer directly exposed to workshop airflow and light conditions during its movement on the screen surface, and air exchange is limited to the confined chamber space. This structural condition cannot change the activity level that has already occurred before screening, nor can it replace the overall management of light-avoiding storage or low-temperature processes, but it can reduce the exposure added by the screening step itself to a relatively low level. For spirulina powder whose quality indicators include phycocyanin, carotenoids and other components, reducing unnecessary exposure in one process step is itself a detail worth implementing in the processing chain.
If an enclosed structure comes at the expense of convenience in screen cleaning and product changeovers, it is difficult to maintain over the long term in actual production. The tendency of spirulina powder to absorb moisture and agglomerate means screen aperture embedding is a continuously occurring risk. If every screen cleaning requires opening the sealed structure, the engineering value of the enclosed design will be offset by frequent downtime.
At this level, the rotary vibratory sieve relies on two configurations to maintain the balance between enclosure and continuity. The first is the bouncing-ball screen-cleaning device: rubber bouncing balls beneath the screen mesh continuously strike the screen surface during vibration, using mechanical impact to break the embedded state of agglomerated particles in the apertures. The cleaning action is completed inside the enclosed chamber without opening the screen body. The second is the quick-release screen structure, which allows screen replacement to be completed within 3–5 minutes; the matching design of seals and clamp rings makes it easy to restore the airtight state after reclosing. The common purpose of these two configurations is that enclosure is not a one-time assembly state, but a working condition repeatedly maintained during screen cleaning, screen replacement and continuous operation.
The hygiene indicators of screen frames, screen meshes and seals in contact with algae powder need to fall within a traceable standards framework. Stainless steel materials and articles for food contact should meet the requirements of GB 4806.9, which sets limits on heavy metal migration; food-grade silicone sealing rings are used for non-metallic contact parts to prevent seals from becoming a new source of contamination. These are entry conditions for equipment to enter spirulina powder processing scenarios, not additional marketing labels.
At the same time, the boundaries of what enclosed screening can cover need to be made clear. It addresses dust escape, foreign matter ingress and external environmental exposure during the screening stage. It does not change the molecular structure of algae powder, does not replace temperature and light management in drying and storage, and does not reverse activity degradation that has already occurred. However, in the process from drying to packaging, screening is a node where algae powder, in a highly dispersed state, comes into contact with the outside environment. By closing off the openings at this node, cleanliness control and management of active-ingredient processing losses have one less link requiring extra remediation. Gaofu Machinery’s enclosed structural design, food-grade material configuration and screen-cleaning–quick-release combination on the rotary vibratory sieve provide exactly this kind of screening condition with a clear scope of action and a clear engineering 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.
