The starting material is conveyed into the zig-zag-shaped sifter channel through an airtight feed mechanism. Here, lighter materials are separated from heavier ones using a multiple cross-flow sifting process. The air required for this separation process flows from bottom to top through the sifting channel. The lighter particles are swept away with the air current while heavier particles fall toward the bottom against the flow of air and are discharged at the base of the separator.

The light material carried by the air flow exits out the top through the sifter channel and is conveyed via ducts to the cyclone where it is then separated and discharged through a rotary gate valve. In general, zig-zag air separator systems operate in recirculation mode, where a ventilator blows the purified air back into the base of the separator. For very dusty or moist products it is also possible to operate the system in partial recirculation or suction mode. The required air flow is provided by a radial ventilator.

Up to 15 separation levels

Turnkey plant solutions possible

Feed hopper

Custom configurations possible

TypeAir volume (m³/h)Mass flow (t/h)Installed output (kW)
SepK 15/80x120300-6000.1-0.2~3
SepK 12/120x360750-1,5000.8-1.5~4
SepK 12/180x5401,750-3,5001.8-3.5~8
SepK 12/180x9002,900-5,8002.9-5.8~12
SepK 9/250x12005,400-10,8005.4-11~25
SepK 6/250x15006,750-13,5006.8-14~35
SepK 6/250x20009,000-18,0009-18~42
SepK 6/350x200012,000-24,00012-24~50

JOEST Zick-Zack-Sichter


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Zig Zag Air Separator

High-precision separation due to multistage cross-flow process (8 to 15 separation stages); also produces uniform sifter cross-sections for post-separation of light materials

Desagglomeration and breakdown of light material clusters

Stable operation through a specially designed fan wheel

Maintenance hatches in the sifter channel for quick cleaning

Recirculation function means no emissions

Robust construction and no rotating parts in the separator leads to high availability levels

No rotary gate valve necessary at the sifter input or output for heavy products; this is dealt with by a special conveyor feeder with rubber curtains

Up to 2-m working width


Secondary Raw Materials - Recycling
Chemical / Food

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Household and Industrial Waste
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Shredder Scrap
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Substitute Fuel
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Construction Waste
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Tires Recycling
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Electronic Scrap
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