The Granule Sifter Machine is designed for grading, de-dusting, and impurity removal from granular materials. It handles solid granules with good fluidity, loose structures, or slight tackiness, including plastic pellets, fertilizer granules, rubber particles, and dried bone granules. Equipped with woven wire mesh or perforated plates ranging from 2 to 200 mesh (aperture size 0.075mm to 8.0mm), a single unit handles processing capacities from 100 kg to 10 tons per hour. By stacking multiple screen decks, the equipment separates materials into 2 to 5 particle size fractions in a single pass.
Fines Contamination in Pellets: Mechanical shearing during pelletizing and dicing generates fine dust. The equipment uses bottom-deck tossing motions to discharge fines through dedicated outlets.
Agglomeration and Clumping: Raw materials tend to clump when stored under humid conditions. The machine utilizes centrifugal vibratory force to break weak agglomerates and screen out oversized connected granules.
Mixed Particle Sizes: When production lines yield non-uniform grain sizes, the machine directs flow through multi-deck screens to fractionate products across defined size gradients.
Driven by a vertical vibratory motor, upper and lower eccentric weights convert the motor's rotation into a three-dimensional composite motion (horizontal, vertical, and inclined). This 3D motion transfers to the screen surface, causing continuous jumping and spiral outward movement of the granules on the mesh.
Granules larger than the mesh aperture move outward due to centrifugal force and discharge from the upper outlet. Granules smaller than the mesh aperture pass through the screen under gravity and vibration speed, falling to the lower deck to achieve continuous grading.
Depending on material density, viscosity, and throughput requirements, the equipment is available in several structural configurations:
| Equipment Type | Vibration Trajectory | Applicable Granule Characteristics | Max Screen Decks |
| Rotary Vibrating Sifter | 3D Spiral Motion | Small to medium granules (0.1-5mm) with good fluidity | 4 Decks |
| Linear Sieving Machine | Dual-Motor Linear Toss | High throughput, large granules (>2mm) for coarse screening and scalp removal | 3 Decks |
| Tumbler Particle Screen | Simulated Manual Tumbling Motion | Friable granules (e.g., expanded bone granules, catalysts) | 5 Decks |
| Parameter Item | Technical Indicator / Range |
| Effective Screen Diameter | 400 mm – 1800 mm |
| Motor Power | 0.25 kW – 3.7 kW |
| Vibration Frequency | 1440 r/min |
| Contact Material | SUS304 Stainless Steel / Q235A Carbon Steel |
| Screen Mesh Fastening | Clamp Ring Lock / Quick-Release Toggle Clamp |
Plastic Granulation: Removes fine dust and merged pellets from PP, PE, and ABS granules after underwater or strand pelletizing.
Compound Fertilizer Production: Screens compaction-granulated or polymer-coated urea granules to isolate finished particles in the 2–4 mm range.
Rubber Recycling: Separates 10–20 mesh and 20–40 mesh rubber granules during waste tire shredding and processing.
In a laboratory test using a sample of recycled ABS plastic granules, the initial material contained 4.2% fines and 2.1% merged pellets.
A single-deck unit with a 1000mm diameter was fitted with a 12-mesh (1.68mm aperture) stainless steel screen. At a feed rate of 1.5 tons per hour, the undersize outlet collected 93.6% target granules. The fine dust removal rate reached 98.1%, and the merged pellet rejection rate reached 99.0%, with zero mesh blinding observed during operation.
A: Bouncing ball tray assemblies can be installed beneath the mesh, utilizing rubber ball impacts to clear trapped particles. For electrostatically charged granules, an ultrasonic de-blinding system can be integrated to neutralize static adhesion.
A: Models equipped with quick-release clamp rings allow operators to loosen the clamp bolts and swap the mesh frame within 3 to 5 minutes.
The Granule Sifter Machine is an essential mechanical unit for particle size grading and fines removal in solids processing lines. Utilizing 3D vibratory action and versatile screen mesh options, it processes plastic, fertilizer, and rubber granules. Combined with various machine designs and anti-blinding kits, it integrates into continuous manufacturing lines to maintain uniform product specifications.
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