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White granulated sugar is one of the most widely used sweeteners in the food processing industry. From baked goods, confectionery and chocolate to beverages, dairy products and seasonings, different food processing applications have completely different requirements for sugar particle size. If the particles are too coarse, they dissolve slowly and may leave sediment in beverages; if they are too fine, they dissolve too quickly and may affect dough water absorption and structure formation in baking.
According to the Chinese national standard GB/T 317‑2018 "White Granulated Sugar", white granulated sugar is classified into five size grades: coarse, large, medium, small and fine. The standard requires that the crystals be uniform and that the particle size distribution within a given grade should be no less than 80%.
What does this standard mean? It means that sugar producers must precisely classify their finished sugar by particle size. Coarse sugar (0.80 mm‑2.50 mm) is suitable for hard candies and decorative sugars that require slow dissolution. Medium sugar (0.45 mm‑1.25 mm) is used in baking and general food processing. Fine sugar (0.14 mm‑0.45 mm) is used in instant beverages and fine pastries.
If classification is not accurate – coarse particles mixed into fine sugar will cause inconsistent dissolution rates and affect user experience; fine powder mixed into coarse sugar will compromise product appearance and taste. The particle size of white granulated sugar directly affects its dissolution rate, mouthfeel and performance in food processing applications.
Multi‑deck classification is the core requirement of white granulated sugar screening.
In actual production, white granulated sugar screening faces three interrelated difficulties:
Pain point 1: Moisture absorption and caking – blocking the screen mesh. Sugar is a high‑sugar material that readily absorbs moisture during storage or transport, forming false lumps. If these lumps are not broken up in time, they will block the mesh openings, causing screening efficiency to drop and requiring frequent stoppages for cleaning. For sugar producers operating continuous production lines, every stoppage represents a loss of capacity.
Pain point 2: Electrostatic adhesion – affecting accuracy. Sugar particles tend to generate static electricity during high‑speed motion, adhering to the screen surface or sticking to each other. This electrostatic effect causes fine powder to adhere to the mesh openings, forming a "powder film" that reduces the effective screening area and lowers classification accuracy.
Pain point 3: Strict hygiene standards. White granulated sugar is used directly in food processing, so production equipment must meet extremely high hygiene standards. Equipment materials must comply with food contact material standards, structures must have no dead corners and be easy to clean, to prevent microbial growth and cross‑contamination.
These three pain points overlap – caking blocks the mesh openings, electrostatic adhesion causes fine powder to stick to the screen, and inadequate hygiene directly threatens food safety – making white granulated sugar a material that requires specialised screening solutions.
The Gaofu S49 series white granulated sugar rotary vibrating sieve uses a vertical vibration motor as the excitation source. Eccentric weights installed at the upper and lower ends of the motor shaft convert the rotational motion into a horizontal, vertical and tilting three‑dimensional compound vibration – known as "three‑dimensional vibration". This compound vibration is transmitted to the screen deck, causing the material to move in a spiral outward trajectory on the screen surface.
This three‑dimensional motion offers three core advantages for white granulated sugar classification:
First, thorough material loosening and natural breaking of lumps. Sugar particles continuously tumble and shift under three‑dimensional vibration, and moisture‑induced false lumps are naturally broken apart during the motion, avoiding accumulation and blockage on the screen surface.
Second, extended screening path and high classification accuracy. The material travels along a spiral trajectory on the screen surface, giving every sugar crystal multiple opportunities to contact the screen. Screening accuracy can reach up to 600 mesh (0.02 mm) .
Third, adjustable motion trajectory for different classification needs. By adjusting the phase angle of the upper and lower eccentric weights, the motion trajectory and residence time of the material on the screen surface can be changed. For different sugar size grades, the parameters can be flexibly adjusted to achieve the optimal classification effect.
Multi‑Deck Classification – One Feed, Multiple Size Grades
The Gaofu S49 series rotary vibrating sieve supports 1 to 5 screen decks, enabling simultaneous classification of 2 to 6 grades.
Taking the most common three‑deck configuration for sugar classification as an example: the top deck (8‑10 mesh) removes large impurities such as packaging debris and threads; the middle deck (40 mesh) collects the medium‑grade finished sugar; and the bottom deck (60 mesh) separates fine powder and ultra‑fine particles. One machine, one feed, simultaneously produces multiple particle size grades of white granulated sugar.
For sugar producers that need to manufacture different grades of white granulated sugar, this design greatly reduces equipment investment and process transfer time.
Anti‑Blinding Screen Cleaning – Solving Caking and Electrostatic Problems
To address the two major problems of moisture‑induced caking and electrostatic adhesion, the Gaofu white granulated sugar rotary vibrating sieve incorporates multiple anti‑blinding solutions:
Silicone bouncing ball cleaning system. Food‑grade silicone balls are placed under the screen deck. During screening, the balls continuously tap the screen cloth, dislodging adhering sugar particles, effectively breaking up lumps and keeping the screen clear.
Ultrasonic anti‑blinding system (optional). For severe electrostatic adhesion or applications requiring higher accuracy, an optional ultrasonic system can be added, using high‑frequency vibration to break the electrostatic adhesion layer and solve the blinding problem of high‑sugar, high‑static materials.
Screen tensioning structure. The screen mounting structure is designed to keep the screen surface flat, reducing material accumulation dead corners and structurally reducing the probability of blinding.
Food‑Grade Stainless Steel – Ensuring Food Safety
White granulated sugar is used directly in food processing, so equipment materials must meet strict hygiene requirements. All material‑contact parts of the Gaofu white granulated sugar rotary vibrating sieve are made of food‑grade 304 stainless steel, with finely polished surfaces, corrosion resistance and easy cleaning. For production lines requiring even higher cleanliness, 316L stainless steel is available.
The equipment has a fully enclosed sealed structure, effectively preventing dust escape during screening, avoiding moisture absorption and cross‑contamination. The simple structure has no hygiene dead corners and supports rapid disassembly for cleaning, meeting food‑grade production hygiene requirements.
Quick Screen Change – Adapting to Multi‑Variety Alternating Production
Different grades of white granulated sugar require different mesh sizes. The Gaofu S49 series rotary vibrating sieve uses a mother‑child screen frame structure, allowing screen changes in just 3 to 5 minutes. The mother screen provides structural support, while the fine screen (working screen) performs the screening. When the fine screen wears out or a different mesh size is needed, only the fine screen needs to be replaced; the mother screen can be used for a long time. This design reduces consumable screen costs while shortening production line downtime.
The Gaofu S49 series white granulated sugar rotary vibrating sieve is suitable for the following classification and impurity removal scenarios:
Finished refined sugar classification. Classifying dried white granulated sugar into coarse, large, medium, small and fine grades according to the national standard particle size specifications, to meet the needs of different downstream food processing applications. Multi‑deck screens complete multi‑grade classification in a single pass.
Raw material impurity removal. During sugar pressing, concentration, boiling, drying and conveying, foreign matter such as ropes, fibres, metal fragments or equipment wear particles may be introduced. The rotary vibrating sieve, through screens of appropriate mesh sizes, intercepts these physical hazards, ensuring the purity of the final product.
Soft white sugar screening. Soft white sugar has a soft, fine texture and is sprayed with invert syrup during production. The rotary vibrating sieve can be used for impurity removal and classification of soft white sugar, ensuring product quality.
Customised classification for baking and beverage industry sugar. Baking requires specific particle sizes to control dough water absorption, while beverage sugar needs rapid dissolution. The rotary vibrating sieve can be configured with different mesh sizes according to customer requirements to produce white granulated sugar of customised particle size specifications.
About Gaofu
Xinxiang Gaofu Machinery Co., Ltd. was originally founded in the 1980s. After more than 40 years of development, the company has become a "National Specialized and Sophisticated 'Little Giant' Enterprise", a "National Green Factory", a "National High-tech Enterprise", a "National Intellectual Property Advantage Enterprise", and the "President Unit of the Vibration Association". It also hosts the "Henan Provincial Industrial Design Center", the "Henan Provincial Engineering Technology Research Center for Intelligent Online Screening Systems", and the "Xinxiang Municipal Engineering Technology Research Center for Fine Screening". The company has been granted more than 500 invention, utility model and design patents, has received the "Science and Technology Achievement Award" issued by the Ministry of Industry and Information Technology, and has participated in drafting four "National Standards".
Gaofu's product portfolio covers several series and hundreds of varieties, including vibrating screening equipment, conveying equipment, coal crushing equipment, filtration equipment, and automated material handling systems. Its main products include vibrating screens, screening machines, vibrating sifters, rotary vibrating screens, ultrasonic vibrating screens, linear screens, air flow screens, gyratory screens, roller screens, dewatering screens, bar screens, vacuum feeders, dust-free feeding stations, ton bag feeding stations, feeding systems, automatic powder feeding systems, automatic slag discharge filters, leaf filters, clay filters, toothed roll crushers, coal crushers, and other equipment. These are widely used in many industries such as food, pharmaceuticals, chemicals, metallurgy, building materials, mining, thermal power, and environmental protection, earning the trust and praise of over 10,000 customers worldwide.
Gaofu products are not only popular in Greater China but are also exported to more than 100 countries and regions, including Russia, Canada, the United States, New Zealand, Japan, Brazil, South Africa, etc. The company adheres to its mission: "Enhance material quality and efficiency, meet customer needs", walking side by side with customers for harmonious and win-win cooperation. Today, Gaofu has become an approved supplier to many Fortune 500 companies, including CNPC, Sinopec, Sinochem Group, China Resources Group, Sinopharm Group, COFCO Group, China National Building Material Group, China Aerospace, and Jinchuan Group.
Gaofu Machinery – Global No.1 in Vibrating Screen Sales. In May 2024, Frost & Sullivan, an international authoritative advisory firm, based on its research on the global vibrating screen market and calculated according to global vibrating screen sales volume in 2023, issued a market position confirmation certificate to Gaofu Machinery.
