Over 10,000+ customers' choice, Focus on screening industry 40+ years
The diversity of feed materials makes the causes of blinding complex – they can be summarised into three main categories:
1. High‑oil materials causing adhesive blinding
Some feed ingredients (such as fish meal, meat and bone meal, and certain protein meals) contain high oil content. During screening, oil gradually adheres to the screen surface, forming an oily film. Fine powder becomes "stuck" to the mesh by this film, accumulating thicker and thicker until the openings are completely sealed. Conventional vibrating screens processing such materials often require stoppages for cleaning after short operating periods, severely restricting continuous production.
2. Ultra‑fine powders causing electrostatic blinding
Ultra‑fine powders such as premixes, vitamins, and trace mineral additives have small particle sizes and large specific surface areas. During screening, friction between particles readily generates static electricity. Charged fine particles attract each other to form agglomerates while simultaneously adhering firmly to the screen surface, forming a dense "powder film" that blocks the mesh. The finer the material, the stronger the electrostatic effect, and the faster the blinding occurs.
3. Hygroscopic lumps causing wedging blinding
Mineral additives, fermented feeds, and other materials with a certain degree of hygroscopicity tend to absorb moisture from the air during storage or conveying, forming lumps. These lumps have uneven hardness and irregular shapes – when they enter the screening zone, they easily become wedged in the mesh openings and are difficult to remove by conventional vibration.
The losses caused by blinding are often cascading – far beyond just "stoppage for cleaning":
Direct throughput loss: As the screen becomes blocked, effective screening area shrinks dramatically, throughput plummets, and the entire production line's output is "choked" at the screening stage.
Increased quality risks: Blinding causes material accumulation and cross‑layering on the screen surface – coarse and fine fractions cannot be effectively separated, making finished product particle size uniformity difficult to guarantee.
Higher labour costs: Frequent stoppages for cleaning require significant manpower – each stoppage means production interruption and wasted labour hours.
Accelerated equipment wear: Forcing operation with a blocked screen increases motor load, accelerates fatigue of vibrating components, and shortens equipment service life.
Gaofu Machinery's S49 series feed rotary vibrating sieve provides a systematic solution addressing the three root causes of blinding in feed screening.
1. Bouncing ball cleaning system – physical knocking for real‑time anti‑blinding
This is the standard cleaning method on Gaofu's rotary vibrating sieve. Bouncing balls are installed between the screen and the support plate – during operation, they continuously bounce and knock against the screen surface. This high‑frequency knocking action dislodges fine powder adhering to the screen and particles wedged in the mesh, achieving real‑time "screening‑while‑cleaning" anti‑blinding. For conventional livestock and poultry feed materials (such as corn flour, soybean meal powder, etc.), the bouncing ball cleaning system effectively resolves most blinding issues.
2. Ultrasonic cleaning system – breaking electrostatic adhesion for ultra‑fine powder blinding
For ultra‑fine powders such as premixes, vitamins, and amino acids (typically above 100 mesh), electrostatic adhesion is the primary driver of blinding. Conventional physical knocking cannot completely remove the electrostatic adhesion layer. Gaofu's S49 series can be equipped with an ultrasonic cleaning system – an ultrasonic generator is added to the conventional rotary vibrating sieve, producing high‑frequency, low‑amplitude mechanical energy. This technology effectively disrupts electrostatic adhesion and agglomeration between powder particles , allowing ultra‑fine powders to pass through the screen easily, fundamentally solving screen blinding and significantly improving screening accuracy.
3. Pre‑breaking device – breaking lumps to eliminate blinding at the source
For materials prone to moisture absorption and lumping (such as mineral additives and fermentation products), Gaofu can install a pre‑breaking unit at the feed inlet. High‑speed rotating breaking rods pre‑break lumps before they enter the screening zone, preventing large material from directly impacting and damaging the screen mesh.
4. Optimised vibration parameters – adapting to different material characteristics
Gaofu's feed‑specific vibrating screen features optimised vibration frequency and amplitude , combined with customised screen cleaning devices, effectively solving blinding problems with high‑oil and high‑moisture materials and ensuring the screen remains open at all times. The equipment runs smoothly – material moves in a three‑dimensional bouncing trajectory on the screen surface, making mesh blinding less likely and suitable for processing feed ingredients with a certain degree of moisture or stickiness.
In livestock and poultry feed production, different materials and different processes have varying requirements for screening equipment. The following provides selection references across five dimensions:
1. Define the screening purpose: impurity removal or grading?
Impurity removal‑focused (e.g., initial cleaning of corn, soybean meal, and other raw materials): single‑deck or double‑deck screens can be used with coarser mesh sizes (10‑40 mesh), prioritising throughput.
Grading‑focused (e.g., finished pellet feed grading): multi‑deck screen configurations are recommended. Gaofu's rotary vibrating sieve supports flexible configurations of 1 to 5 screen decks , enabling a single feed to produce 2 to 6 different particle size fractions simultaneously.
2. Match material characteristics – tailor the configuration to the material
High‑oil materials (fish meal, meat and bone meal, etc.): prioritise models with bouncing ball cleaning systems – high‑frequency knocking prevents oil film blinding.
Ultra‑fine powders (premixes, vitamins, etc.): ultrasonic cleaning systems are recommended – fundamentally breaking electrostatic adhesion.
Lump‑prone materials (mineral additives, fermented feeds, etc.): pre‑breaking devices are recommended – eliminating lumps at the source.
3. Assess throughput requirements – match production scale
Gaofu's S49 series feed rotary vibrating sieve covers single‑machine throughput of 0.1 t/h to 20 t/h , with classification efficiency of 90% to 98%. Whether for small‑scale plants producing a few tonnes per hour or large‑scale lines producing over 20 tonnes per hour, suitable screening solutions are available. When selecting, choose the appropriate model based on actual production capacity requirements – avoiding over‑sizing (wasted capacity) or under‑sizing (bottleneck).
4. Consider hygiene and durability – materials and structure
Livestock and poultry feeds are food‑grade products, placing strict requirements on equipment materials and hygiene standards. 304 food‑grade stainless steel is recommended as the standard for all material‑contact parts, complying with feed hygiene standards. The equipment should feature a fully enclosed structure – no dust emission during operation, meeting environmental requirements while preventing cross‑contamination. The internal design should have no dead corners or exposed bolts for thorough cleaning.
5. Evaluate maintenance convenience – screen change and cleaning
Screen change convenience directly affects equipment utilisation and maintenance costs. Gaofu's rotary vibrating sieve features a user‑friendly screen change structure – general operators can complete screen changes within minutes. In addition, long screen life significantly reduces downtime, lowering maintenance and labour costs.
Screen blinding in feed screening ultimately stems from a "mismatch" between material characteristics and screening methods. Gaofu Machinery's S49 series feed rotary vibrating sieve – with its combined core technologies of bouncing ball physical cleaning, ultrasonic electrostatic disruption, pre‑breaking lump elimination, and optimised vibration parameters – provides livestock and poultry feed processors with a systematic solution that addresses blinding problems at their root.
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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.
