What is a Vertical Negative Pressure Wind Sifter?
A Vertical Negative Pressure Wind Sifter Machine, also called a vertical air separator or negative pressure air classifier, separates light and heavy materials by vertical airflow. Lightweight materials such as plastic film, paper, textiles, and wood chips are lifted by airflow, while heavy materials like concrete, glass, stones, and metals are discharged by gravity. It is usually installed after shredders and screens, and works with conveyors, magnetic separators, eddy current separators, and optical sorting machines in recycling plants.
Applicable Materials
A Vertical Negative Pressure Wind Sifter Machine is designed for separating mixed waste with a maximum feed size of <100 mm and processing capacities ranging from 20–100 m³/h, depending on the model. It is suitable for treating municipal solid waste (MSW), construction and demolition (C&D) waste, commercial waste, industrial waste, plastics and RDF/SRF materials. The machine efficiently separates low-density materials, including plastic film, paper, cardboard, textiles, foam and wood chips, from high-density materials such as stones, bricks, concrete, glass, ceramics and metals, providing cleaner material streams for downstream recycling and resource recovery.
Working principle
A vertical negative pressure wind sifter separates materials by using stable negative pressure airflow and density differences. Mixed waste enters the separation chamber through the feeding system, where the adjustable negative pressure fan creates a controlled upward airflow. Lightweight materials such as plastic film, paper, foam, and textiles are captured and transported by the airflow, while heavier materials such as stone, glass, metal, and organic materials move downward for separate discharge.
The enclosed airflow design and dust collection system help reduce dust emissions and improve operating conditions. With adjustable separation performance and stable airflow control, the equipment provides efficient light and heavy material separation for MSW sorting, C&D waste recycling, RDF production, and industrial waste processing applications.If you want to learn about the working process and mechanism of a negative-pressure wind sifter, click here
Main Components :
Feeding Hopper: Provides uniform feeding to ensure stable material flow and separation performance.
Vertical Separation Chamber: Creates controlled airflow zones for accurate light and heavy material separation.
Negative Pressure Fan: Generates stable suction airflow to remove lightweight waste materials efficiently.
Adjustable Air Valve: Regulates airflow intensity to match different material separation requirements.
Cyclone Separator: Separates and collects light fractions to improve material recovery efficiency.
Dust Collection System: Captures fine dust and reduces emissions for cleaner recycling operation.
Electrical Control Cabinet: Controls system operation and improves equipment reliability and safety.
Specifications
FXF Series Vertical Negative Pressure Wind Sifter offers reliable airflow control and efficient light-heavy material separation. The specifications below include air pressure, airflow volume, feed size, power, and processing capacity for different recycling applications.
| Model | Air Pressure (Pa) | Air Flow (m³/h) | Max. Feed Size (mm) | Power (kW) | Processing Capacity (m³/h) |
| FXF08 | 1200–1400 | 26,700–37,000 | <100 | 18.5 | 20–50 |
| FXF10 | 20–80 | ||||
| FXF12 | 20–100 |
Vertical Negative Pressure Wind Sifter vs Horizontal Wind Sifter
Vertical and horizontal wind sifters both use airflow separation technology, but they differ in structure, airflow direction, footprint, and applications. Vertical models offer compact design and precise separation, while horizontal models are suitable for larger layouts and different material handling needs. The key differences are shown below.If you’re interested in “Horizontal vs. Vertical Wind Sifter Machine: What’s the Difference?”, please click here
| Feature | Vertical Negative Pressure Wind Sifter | Horizontal Wind Sifter |
| Installation | Vertical design, less space required | Horizontal design, more space needed |
| Footprint | Compact and space-saving | Larger installation area |
| Airflow Direction | Vertical airflow for light fraction separation | Horizontal airflow for material transport |
| Separation Accuracy | Higher accuracy for light material sorting | Suitable for basic light material removal |
| Energy Consumption | Optimized airflow with lower energy use | May require higher airflow volume |
| Capacity | Suitable for medium to high capacity | Suitable for various capacities |
| Maintenance | Easy access and simple maintenance | Requires more maintenance space |
| Applications | MSW, C&D waste, RDF, plastic recycling | General waste sorting applications |
Advantages
Applications
FXF Vertical Negative Pressure Wind Sifter is designed for waste recycling plants to separate lightweight materials from mixed waste streams. With stable negative pressure airflow and adjustable separation control, it effectively removes materials such as plastic film, paper, textiles, and other light fractions, improving sorting efficiency and the quality of recovered materials in different recycling applications.If you would like to learn more about the advantages of negative-pressure wind sifters for MSW recycling, please click here.
Custom Containerized Windshifter Solutions
Xinzhongyi ECO provides customized Vertical Negative Pressure Wind Sifter solutions for different material characteristics, processing requirements, and recycling plant conditions. We offer both standalone equipment and complete recycling line solutions, covering process design, equipment configuration, plant layout, manufacturing, installation guidance, and commissioning support. With professional engineering expertise, we help customers build efficient and reliable waste sorting and recycling systems.
Custom Options Include:
- Waste composition and target materials to be separated.
- Size range and characteristics of incoming materials.
- Required throughput or production capacity.
- Material moisture level affecting separation performance.
- Target light and heavy material separation results.
- Local voltage, frequency, and electrical requirements.
- Available space, layout requirements, and site conditions.
Vertical Negative Pressure Wind Sifter Manufacturer & Supplier
Xinzhongyi ECO is a windshifter manufacturer and supplier with 16+ years of experience in waste recycling equipment. Supported by 3 production bases, 300+ acres of manufacturing facilities, and 60+ patents, we design and manufacture wind separation equipment for MSW, C&D waste, RDF, plastic recycling, and industrial waste processing applications.
We help customers solve challenges such as unstable separation performance, low recovery purity, and complex material sorting requirements. Our engineering team provides customized windshifter selection, airflow adjustment, process design, and complete recycling line solutions, with support from manufacturing and installation guidance to commissioning and after-sales service.
FAQ
A Vertical Negative Pressure Wind Sifter is an air separation machine that removes lightweight materials from mixed waste by using controlled negative airflow. It is widely used in MSW, C&D waste, RDF, and industrial recycling plants to improve material purity before downstream sorting or processing.
The machine is suitable for separating plastic film, paper, cardboard, textiles, foam, and other light fractions from heavier materials such as aggregates, glass, stones, metals, and wood. Separation performance depends on material density, particle size, moisture content, and airflow settings.
Vertical Negative Pressure Wind Sifters are commonly installed in municipal solid waste (MSW) sorting plants, construction and demolition (C&D) waste recycling facilities, RDF production lines, landfill mining projects, and commercial recycling centers. They are typically positioned after screening or shredding to improve downstream sorting efficiency.
Yes. A Vertical Negative Pressure Wind Sifter can be installed in both new and existing recycling plants. It can be integrated with conveyors, trommel screens, shredders, magnetic separators, eddy current separators, and optical sorters to improve overall material recovery without requiring major process changes.
Negative pressure systems provide more stable airflow and better dust control than conventional positive pressure designs. They help reduce recyclable contamination, improve separation consistency, lower manual sorting requirements, and create a cleaner operating environment for recycling facilities.
Routine maintenance mainly includes inspecting fans, ducts, bearings, and wear components, as well as cleaning dust accumulation and checking airflow settings. With regular maintenance and proper operation, the equipment can maintain stable performance and minimize unexpected downtime.
