Wacker Chemie Ag

Siltronic Ag

Christian Fraunhofer

Andreas Bergmann

Thomas Buschhardt

Matthias Vietz

Werner Lazarus

Simon Ehrenschwendtner

Herbert Schmoelz

Herbert Schmölz

Polysilicon chunks or granules are classified into size fractions using a mechanical screen having a profiled surface having peaks and valleys, and terminating in widening slots through which a polysilicon size fraction falls. The device is effective and the slots are resistant to clogging.

Screen plate for screening plants for mechanical classification of polysilicon

The invention relates to a process for packaging polycrystalline silicon in the form of chunks, including the following steps: (a) providing polycrystalline silicon in a metering system; (b) filling polycrystalline silicon from the metering system, which removes fines by use of screening, into a plastic bag arranged below the metering system. The weight of the plastic bag with the polycrystalline silicon introduced is determined during the filling step and the filling step is ended after the attainment of a target weight. A fall height of the polycrystalline silicon from the metering system into the plastic bag is kept at less than 450 mm by use of at least one clamp apparatus over the entire filling step.

Packaging of polycrystalline silicon

Growing community of inventors

Mitterskirchen, Germany

Christian Fraunhofer