Over 10,000+ customers' choice, Focus on screening industry 40+ years
Screening challenges of plant protein. Plant protein powders such as soy protein isolate and pea protein require a final impurity removal screening step after drying to remove impurities, lumps, and agglomerated material, ensuring the purity of the semi‑finished product. These materials are typically light in density and fine in particle size – during screening, friction generates static electricity, causing fine powder to adhere to the screen surface and gradually accumulate, forming a "powder film" that blocks the mesh. In actual production, soy protein powder screening typically ranges from 24 to 120 mesh, with throughputs of 80 to 1,000 kg/h.
Screening challenges of whey protein. Whey protein powder is even finer and tends to block the screen mesh during screening, affecting filtration efficiency. Additionally, whey protein powder may contain larger sediment particles that need to be effectively separated through the screen to prevent them from entering the finished product. Whey protein powder also has a certain degree of stickiness, making it prone to adhering to the screen surface – placing higher demands on the equipment's screen cleaning capability.
Common challenge: blinding and cross‑contamination. Whether plant protein or whey protein, screen blinding is the primary factor affecting screening efficiency. Frequent stoppages for screen cleaning not only reduce throughput but also increase labour costs. At the same time, as a food ingredient, protein powder places strict requirements on equipment materials and cleanliness – equipment must meet food‑grade hygiene standards, be easy to clean and sanitise, and prevent cross‑contamination between different product types.
Gaofu's S49 series rotary vibrating sieve (three‑dimensional rotary vibrating sieve) uses a vertical vibration motor as the excitation source. Eccentric weights installed at the top and bottom of the motor convert rotary motion into a three‑dimensional compound motion (horizontal, vertical, and inclined), which is transmitted to the screen surface. By adjusting the phase angle of the upper and lower eccentric weights, the material's movement trajectory and residence time on the screen can be flexibly changed to suit different protein powder characteristics.
Addressing the two major challenges of protein powder screening, the rotary vibrating sieve provides systematic solutions in the following areas:
1. Three‑dimensional vibration trajectory effectively reduces blinding
On conventional two‑dimensional vibrating screens, fine protein powder tends to accumulate statically on the screen surface, gradually blocking the mesh. The three‑dimensional compound motion of the rotary vibrating sieve causes material to spread outward on the screen surface in a spiral path, with constant tumbling and bouncing – this reduces the static residence time of fines on the screen surface, inherently lowering the probability of blinding and ensuring screening continuity.
2. Multi‑deck grading completes multiple steps in one pass
Protein powder processing requires both impurity removal (removing lumps and foreign matter) and particle size classification (separating material into different grades). Gaofu's rotary vibrating sieve supports flexible configurations of 1 to 5 screen decks , enabling 2 to 6 grades of separation or filtration in a single feed. For example, the upper deck intercepts large lumps and foreign matter, the middle decks achieve fine classification, and the lower deck acts as a safety screen to ensure finished product purity. This "multi‑function in one machine" design reduces material transfers between multiple units, shortening overall processing time. With Gaofu's S49 series, classification efficiency can reach 92% to 98%.
3. High screening accuracy ensures fineness compliance
Gaofu's rotary vibrating sieve achieves screening fineness up to 600 mesh (0.02 mm) and filtration precision down to 5 microns. Soy protein powder typically requires 24‑120 mesh screening – the rotary vibrating sieve's accuracy capability covers the full range from coarse screening to fine classification, ensuring consistent finished product fineness.
4. Anti‑blinding design ensures continuous production
To address the blinding tendency of protein powders, Gaofu's rotary vibrating sieve is equipped with a bouncing ball cleaning system (optional) that continuously strikes the screen surface during operation, enabling smooth material passage. For ultra‑fine powder screening above 100 mesh, an ultrasonic cleaning system can be configured – high‑frequency vibration keeps fine powder in a "suspended" state on the screen surface, effectively inhibiting adhesion and blinding. Impurities and oversize material are automatically discharged, supporting continuous operation.
5. Food‑grade materials ensure hygiene and safety
Protein powder is widely used in food and health supplement applications, placing high demands on equipment hygiene standards. Gaofu's rotary vibrating sieve uses 304 food‑grade stainless steel for all material‑contact parts (316L available on request), with finely polished surfaces and no dead corners. The fully enclosed structure, combined with food‑grade seals, prevents dust emission during operation. It complies with food industry hygiene requirements and effectively prevents cross‑contamination between different product types.
When selecting a rotary vibrating sieve for protein powder processing, consider the following dimensions:
1. Material characteristics determine equipment configuration
Different protein powders have significantly different physical properties – selection should be tailored to the specific material:
Plant protein powders prone to static (e.g., soy protein isolate, pea protein) : Choose models with ultrasonic cleaning systems to effectively inhibit electrostatic adhesion and blinding
High‑fineness, moisture‑prone materials (e.g., whey protein powder) : Choose fully enclosed models with heating options to prevent moisture absorption and lumping
Protein powders with significant lumping : Choose configurations with de‑agglomeration devices to pre‑disperse lumps before screening
2. Match screening accuracy with throughput requirements
Select the appropriate screen mesh based on the target fineness of the protein powder product. Gaofu's rotary vibrating sieve covers 2 to 500 mesh. Soy protein powder typically requires 24‑120 mesh. In terms of throughput, Gaofu's S49 series covers 100 to 3,300 kg/h , meeting the capacity needs of protein powder processors of various scales.
3. Hygiene standards and material requirements
As a food ingredient, protein powder requires 304 or 316L stainless steel for all material‑contact parts to meet food‑grade hygiene standards. The equipment design should have no dead corners, be easy to disassemble and clean, and minimise cross‑contamination risks between batches.
4. Selection of screen cleaning method
For conventional materials, bouncing ball cleaning systems are suitable. For ultra‑fine powders above 100 mesh and electrostatic materials, an ultrasonic cleaning system is recommended. The ultrasonic system effectively resolves mesh blinding issues for fine powders through high‑frequency vibration.
5. Supplier qualifications and service capability
The reliable operation of screening equipment depends on the supplier's technical expertise and after‑sales support. Consider the supplier's industry experience, patent portfolio, and relevant industry certifications. Founded in the 1980s, Gaofu Machinery has over 40 years of R&D and manufacturing experience in screening, and has been recognised as a National Specialised and Sophisticated "Little Giant" Enterprise , National Green Factory , and National Intellectual Property Advantage Enterprise.
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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.
