Over 10,000+ customers' choice, Focus on screening industry 40+ years
In the nut processing industry, classification is an essential process step that cannot be bypassed. Walnuts, almonds, cashews, pistachios, hazelnuts, macadamia nuts – every type of nut must be classified by particle size before entering subsequent processing or packaging.
The purpose of classification is clear: different particle sizes correspond to different market positions and selling prices. Large nuts are typically used for premium gift boxes and whole‑nut packaging, medium nuts for baking and snack ingredients, and small nuts for chopped nut processing or as raw materials for further processing. If classification is not accurate – with large nuts mixed into small sizes – the appearance and selling price of the entire batch will be affected.
Traditional nut classification methods either rely on manual sorting – which is inefficient, has a high miss rate, and faces continuously rising labour costs – or use single‑deck screening equipment with multiple passes. A single screening machine can only separate material into "pass" and "fail" categories. To obtain three or four grades, multiple machines in series or repeated screening passes are required. More equipment, longer processes, larger floor space – and line efficiency is significantly compromised.
Is there a piece of equipment that can simultaneously separate multiple particle size grades from a single feed of nut raw material?
The Gaofu S49 series multi‑deck nut rotary vibrating sieve is a solution designed specifically for this need. With a multi‑deck screen structure for "one feed, multiple fractions," three‑dimensional gyratory motion for screening accuracy, and food‑grade stainless steel for hygiene safety, it transforms nut classification from "multiple steps with repeated screening" to "one pass, multiple grades out."
Nut raw material classification faces two interrelated challenges in actual production.
Challenge 1: Wide particle size range with multiple grades. Taking almonds as an example, export‑grade almonds are typically classified by width into multiple grades such as W180, W210, W240, W320, W450, and more. Walnuts, cashews, pistachios and others similarly require three to five particle size grades. If a screening machine has only one deck, it can only separate into "large/small" categories. To obtain four or five grades, four single‑deck screens in series or repeated screening passes are needed – requiring significant equipment investment, large floor space, and long processes, with material facing the risk of secondary contamination and breakage during multiple transfers.
Challenge 2: Diverse material forms requiring both classification and impurity removal. Nut raw materials contain various "unwanted" elements: broken kernels, shell fragments, fine powder, dust, and packaging debris and foreign matter that may be introduced during processing. If these impurities are not removed during classification, they will directly affect the appearance and food safety of the finished product. Classification equipment must have impurity removal capability while completing particle size sorting.
The Gaofu S49 series nut rotary vibrating sieve operates on the three‑dimensional gyratory motion principle. The equipment uses a vertical vibration motor as the excitation source, with eccentric weights installed at the upper and lower ends of the motor shaft converting the rotational motion into compound vibration in horizontal, vertical and tilting directions, which is then transmitted to the screen deck. By adjusting the phase angle of the upper and lower weights, the motion trajectory of the material on the screen surface can be changed to suit the screening requirements of different nuts.
The value of this three‑dimensional motion for nut classification lies in two aspects:
First, thorough material loosening and natural stratification on the screen surface. Nut particles continuously roll and shift under three‑dimensional gyratory motion, and particles of different sizes naturally stratify during the motion – large particles move toward the periphery of the screen, while medium and small particles tend toward the centre for passage through the mesh. This stratified motion gives every nut the opportunity to contact the screen of the corresponding aperture, resulting in higher classification accuracy.
Second, extended screening path for thorough classification. The material travels along a spiral outward trajectory on the screen surface, with a path length far greater than that of linear screening. The equipment supports 1 to 5 screen decks , enabling simultaneous separation into 2 to 6 grades. One machine, one feed – simultaneously completes classification into multiple particle size grades.
Advantage 1: Multi‑Deck Classification – One Feed, Multiple Fractions
The Gaofu S49 series rotary vibrating sieve supports 1 to 5 screen decks , enabling simultaneous separation into 2 to 6 grades. Taking the most typical four‑deck configuration for nut classification as an example:
First deck (largest aperture): Intercepts oversized particles and foreign matter – extra‑large particles are discharged from the top outlet
Second deck (larger aperture): Collects large‑grade nuts
Third deck (medium aperture): Collects medium‑grade nuts
Fourth deck (smaller aperture): Collects small‑grade nuts – fines and debris are discharged from the bottom deck
One material enters, multiple specification products are produced simultaneously. A single machine replaces the traditional approach of multiple single‑deck screens in series or repeated screening passes – greatly reducing equipment investment, floor space and process transfer time.
Advantage 2: Impurity Removal and Classification Completed Simultaneously
Nut raw materials may contain broken kernels, shell fragments, fine powder, dust and packaging debris. During classification, the Gaofu nut rotary vibrating sieve simultaneously separates and discharges impurities and debris larger than the corresponding mesh openings through the interception of each screen deck.
Screening and impurity removal are completed simultaneously in a single machine – reducing the investment of a separate impurity removal unit and avoiding the logic that each additional material transfer increases the risk of contamination.
Advantage 3: Food‑Grade Stainless Steel – Ensuring Food Safety
Nuts are used directly in food processing and packaging, so equipment materials must meet strict hygiene requirements. All material‑contact parts of the Gaofu nut rotary vibrating sieve are made of food‑grade 304 stainless steel , with 316L stainless steel available upon request. The equipment complies with food GMP standards, eliminating the risk of metal contamination at the material source.
Advantage 4: Fully Enclosed Sealed Structure – Dust and Contamination Protection
During nut classification, fines and debris tend to escape into the workshop air. The Gaofu nut rotary vibrating sieve features a fully enclosed sealed structure , with screening taking place inside a sealed chamber – no powder escape, no material leakage. The fully enclosed design also effectively blocks external foreign matter from entering the screening system, ensuring the purity of the nuts.
Advantage 5: 360° Adjustable Discharge Ports – Flexible Line Integration
The discharge ports of the rotary vibrating sieve can be rotated 360° around the axis, facilitating the arrangement of auxiliary equipment. Regardless of workshop layout, it can flexibly connect to upstream and downstream equipment, adapting to the installation requirements of different production lines.
Advantage 6: Quick Screen Changes – Adapting to Multi‑Variety Alternating Production
Different nut varieties require different mesh sizes for classification – almonds, cashews, walnuts and pistachios each have their own standard grades. The Gaofu S49 series rotary vibrating sieve features a quick‑change screen structure , allowing screen changes in just 3 to 5 minutes. When switching between different varieties, screen changes are convenient and efficient, greatly reducing downtime.
From the perspective of actual production conditions in nut processing, the Gaofu S49 series multi‑deck rotary vibrating sieve delivers value in four dimensions:
Accuracy value – Multi‑deck classification ensures that a single feed produces nut products in multiple particle size grades. Classification accuracy is stable and controllable, with minimal batch‑to‑batch variation. Large nuts have a regular appearance, medium and small nuts have uniform particle size, product grades are clearly distinguished, and market pricing and brand reputation are reliably assured.
Efficiency value – One machine completes multi‑grade classification, replacing multiple single‑deck screens in series or repeated screening passes. The equipment can run 24 hours continuously, with impurities automatically discharged without manual intervention. The overall capacity of the production line is fully utilised, and labour costs are significantly reduced.
Hygiene value – Food‑grade 304 stainless steel and the dead‑corner‑free design make the equipment easy to clean with no material residue; the fully enclosed structure effectively controls dust escape and external contamination. This helps enterprises meet the hygiene requirements of food GMP and HACCP systems.
Cost value – One machine completes multi‑grade classification, reducing equipment investment and floor space; the quick‑change screen design shortens downtime for variety changes; the fully enclosed structure reduces material loss; the equipment has a normal service life of 15 to 20 years. The combined effect of these four factors keeps long‑term operating costs under control.
Food Industry Client Testimonials
Nestlé, CP Group, Haitian Flavour & Fragrance, Yihai Kerry, Yili, Mengniu,Shuanghui, Wahaha, Master Kong, Want Want, Anjoy Foods, Angel Yeast,Yangyuan Foods, Uni-President Enterprises, Qiaqia Food, Luhua Group,Alpenliebe, Golden Monkey, Orion, Xizhilang,Sanquan Foods, Synear Food, Oishi, Wong Lo Kat, Yanjing Beer, Seamild,Jinpai, Chubang, Hengshun Vinegar Industry, Longda Group, Beijing Daoxiangcun, Anhe Dairy,Weiwei Group, Xiangpiaopiao, Maiquer, Tianbing, Binqi Food, Ligao Okun
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.
