Special silos for recycling applications
KREYENBORG offers special silos for recycling applications for a wide range of materials with low and varying bulk densities:
Fiber Silo
Due to their relatively low bulk density, flow properties, consistency, or static electricity, light-weight materials such as fibers tend easily to bridge when being stored and discharged. The purpose of the Fiber Silo is precisely to avoid this unwanted effect.

Low bulk density | specially for the processing of fibers with a low bulk density, also suitable for different flakes and powder |
Bulk density | 50 to 100 g/m³ (0,05 to 0,1 kg/dm³) |
Agitator shaft | the agitator feeds the material continuously towards the discharge screw |
Material size | fibers are 10 to 30 mm in length |
Feeding | from above via filling opening or tangential |
Construction | the conical design ensures a sloughing of the material and prevents bridging of the material |
Outlet | up to 3 controllable material outlets possible |
Discharge | consistent and adjustable discharge by means of a separate discharge screw |
Manhole | with limit switches for better maintenance of the silo |
Volume | 3 m³ to 50 m³ |
Materials | standard or stainless steel |
Railing/vertical ladder | optional with guard rails on top and vertical ladder, including back protection |
Options | other options and sizes available on request |
Film Flake Silo
Due to their relatively low bulk density, flow properties, consistency or static electricity, light-weight materials such as film flakes tend easily to bridge when being stored and discharged. The purpose of the Film Flake Silo is precisely to avoid this unwanted effect.

Low bulk density | specially for the processing of film flakes with low bulk density |
Bulk density | 20 to 300 g/m³ (0,02 to 0,3 kg/dm³) |
Mixing screw | three vertically-mounted mixing screws |
Homogenization | constant movement of the material promotes homogenization of film flakes of variable thickness and size |
Material size | film flakes are up to 30 mm in length |
Feeding | tangential feeding |
No dead zones | specially shaped silo to avoid dead spots |
Discharge | consistent and adjustable discharge via a separate discharge screw |
Manhole | with limit switches for better maintenance of the silo |
Volume | 3 m³ to 40 m³ |
Materials | standard or stainless steel |
Railing/vertical ladder | optional with guard rails on top and vertical ladder, including back protection |
Options | other options and sizes available on request |
Block-Type Silo
Special Block-Type Silo for the storage and dosed discharge of ground and sensitive materials such as film shreds, fibers, foams, etc.

Low bulk density | specially for the processing of materials with low bulk density |
Sensitive bulk | especially suitable for sensitive bulk |
Bulk density | 50 to 200 g/m³ (0,05 to 0,2 kg/dm³) |
Feeding | tangential feeding by means of pressure transport |
Loosening | the bottom of the structure contains a twin discharge screw and stepped loosening elements that prevent the material from bridging |
Discharge | The material sinks smoothly. A trough screw extended over the complete length of the silo ensures an uniform and adjustable discharge. |
Manhole | with limit switches for better maintenance of the silo |
Volume | by default, block-type silos with a volume up to 60 m³ are available |
Materials | standard or stainless steel |
Railing/vertical ladder | optional with guard rails on top and vertical ladder, including back protection |
Options | other options and sizes available on request |
Stock Silo
Stock silos are used for interim storage of sophisticated and high-quality bulk materials, such as pellets, raw materials or powders. We offer silo diameters of up to 2,850 mm as standard, but we are also happy to implement other diameters for our customers.
Products | plastics, raw materials, pellets, agglomerates, flakes, powders, regrinds, cut/ground goods |
Feeding | tangential feeding via pressure transport |
Manhole | with limit switches for better maintenance of the silo |
Volume | on request |
Materials | aluminium, normal or stainless steel |
Railing/vertical ladder | optional with guard rails on top and vertical ladder, including back protection |
Options | other options and sizes available on request |