A closed system vibrating sifter is a high-performance screening machine operating within a fully sealed, airtight environment. Unlike conventional open-type sifters, it uses specialized pneumatic or mechanical sealing mechanisms to isolate materials completely from the outside atmosphere during the separation of fine powders, granules, and liquids.
Powered by a precision vertical vibration motor, this equipment delivers multi-plane motion to classify particle sizes while keeping toxic, reactive, or ultra-fine dust strictly contained.
The system feeds material into the enclosed chamber via dust-tight inlets. Under the multi-directional vibration force, particles pass through precision screen meshes: oversized debris is directed to discharge spouts, while qualified fine powder drops securely down through hermetically sealed outlets, ensuring zero leakage throughout the entire process.
To meet diverse production line requirements, Dahan Machinery manufactures several specialized structural configurations under the closed system sifter category:
Dahan Machinery offers versatile closed system screening series tailored to precise separation requirements. Review the standard industrial parameters below:
| Series / Model | Diameter (mm) | Layers / Decks | Power (kW) | Capacity (kg/h) | Containment & Features |
|---|---|---|---|---|---|
|
DH-S Series Standard Hermetic |
600 / 800 / 1000 / 1200 | 1 - 5 Layers | 0.25 - 1.5 | 200 - 1800 | Dust-tight quick-clamp seal for multi-grade separation. |
|
DH-DS Series Direct Discharge |
600 / 800 / 1000 / 1200 | 1 Layer (Quick out) | 0.18 - 0.55 | High Throughput | Bottom direct discharge for rapid line safety screening. |
|
DH-U Series Ultrasonic Enclosed |
600 / 800 / 1000 / 1200 | 1 - 3 Layers | 0.25 - 1.1 (+ Ultrasonic) | Fine Powder (80-600 Mesh) | Built-in ultrasonic system to eliminate fine mesh blinding. |
In fine powder processing, traditional open or poorly sealed vibrating sifters often cause operational bottlenecks. Dahan Machinery’s closed system is engineered to solve these critical plant floor challenges:
Fine powder leakage during screening poses serious health hazards and explosion risks. Our hermetic seal locks in micro-particles, protecting workers and maintaining a clean, compliant workspace.
External air and moisture can ruin sensitive chemical or pharmaceutical powders. The completely isolated chamber prevents outside contamination, ensuring absolute product purity.
Standard joints loosen under constant high-speed vibration. We use reinforced pneumatic and clamping seals that maintain airtight integrity even during 24/7 heavy-duty operation.
Dahan Machinery integrates precision mechanical craftsmanship with advanced sealing technology to ensure ultimate containment, durability, and operational ease.
Equipped with food-grade silicone seals and heavy-duty quick-release clamps (or pneumatic inflatable seals) to eliminate gaps and maintain absolute airtight integrity.
Contact parts built from premium SUS304 or SUS316L with mirror polishing (Ra < 0.2µm), preventing material adhesion and meeting strict hygienic requirements.
Designed for efficiency, the quick-locking mechanism allows operators to replace screen meshes in minutes, significantly reducing plant downtime.
Screening fine, cohesive, or electrostatic powders (up to 500 mesh) often leads to mesh blinding. To maintain high throughput inside our closed system, Dahan Machinery offers advanced auxiliary clearing devices:
Applies a high-frequency, low-amplitude ultrasonic vibration directly to the screen mesh, successfully breaking down surface tension and eliminating particle clogging without damaging the powder.
Food-grade silicone or rubber bouncing balls move beneath the support screen, continually striking the mesh to dislodge trapped particles during operation.
Different materials and industries require specialized closed-screening configurations. Below is our expert guide matching handled materials to the ideal Dahan Machinery equipment:
| Industry Sector | Handled Materials | Recommended Series & Models | Key Compliance & Advantage |
|---|---|---|---|
| Pharmaceutical Industry | API powders, raw ingredients, starch, excipients. | DH-S Series (Model: DH-600-S / 800-S) | cGMP compliant, mirror polished SUS316L, absolute containment. |
| Food & Beverage | Flour, milk powder, sugar, food additives, cocoa powder. | DH-DS Series (Model: DH-800-DS / 1000-DS) | Direct quick-discharge, prevents accumulation, food-grade seals. |
| Fine Chemicals & New Energy | Lithium battery powders, resins, pigments, metal powders. | DH-U Series (Model: DH-1000-U / 1200-U) | Ultrasonic anti-blinding for fine powders, optional ATEX explosion-proof. |
Dahan Machinery’s closed system screening solutions have been successfully deployed worldwide. Explore our proven field applications and plant performances below:
Application: Rigorous grading and particle size distribution analysis for construction and industrial fine aggregates.
Performance: Ensured precise cut-points and stable separation efficiency.
Read Full Case Study →
Application: Tackling sticky, viscous, or oily feed materials that typically cause severe screen blinding.
Performance: Ultrasonic integration successfully eliminated mesh clogging and maintained continuous throughput.
Read Full Case Study →
Application: Hygienic, dust-free grading of food-grade sweeteners and sugar powders.
Performance: Delivered high-purity separation under strict sanitary standards with zero contamination.
Read Full Case Study →
At Dahan Machinery, we prioritize precision manufacturing and rigorous quality control. Our state-of-the-art facility ensures every sifter meets the highest international standards for industrial performance and sanitary compliance.
Have questions about selecting or operating our closed system vibrating sifters? Here are answers to our most commonly asked industrial inquiries:
Dahan Machinery’s closed sifters utilize precision-engineered silicone or rubber sealing gaskets between frame decks, combined with quick-release clamping bands. This creates a 100% dust-tight, hermetic environment that protects operators from fine airborne particles and prevents external contamination.
The DH-S Series is the standard multi-deck hermetic sifter for multi-grade grading. The DH-DS Series features a direct-discharge design optimized for high-throughput, single-deck safety screening. The DH-U Series integrates an ultrasonic screening system specifically engineered to prevent mesh blinding when processing ultra-fine or sticky powders.
Yes. We offer full compliance with food and pharmaceutical standards. All contact parts can be customized using high-grade SUS304 or SUS316L stainless steel with mirror polishing options to meet cGMP and strict sanitary regulations.
Selection depends on your required hourly capacity, bulk density, moisture content, and particle cut-points. You can share your material details with our engineering team, and we will provide a professional sizing recommendation and material test report.
Get expert sizing recommendations, custom material testing reports, and a direct factory quotation from Dahan Machinery’s engineering team today.
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