Method and device for dosing and packaging polysilicon chunks and dosing and packaging unit

A method for dosing and packaging polysilicon chunks, comprising:

• transporting a product flow of polysilicon chunks via a feed channel;
• separating the product flow into coarse chunks and fine chunks using at least one screen;
• weighing and dosing the coarse chunks and the fine chunks using a dosing balance to provide a target weight of polysilicon chunks to be discharged;
• discharging the polysilicon chunks to be discharged via a discharge channel to provide discharged polysilicon chunks;
• transporting the discharged polysilicon chunks to a packaging unit;
• filling a first plastic bag with the discharged polysilicon chunks to provide a filled first plastic bag;
• sealing the filled first plastic bag;
• and
• packaging the filled first plastic bag in a second plastic bag which is formed by a shaper and is subsequently welded,
• wherein:
• (a) the first plastic bag is introduced horizonally into the second plastic bag, (b) the second plastic bag is welded on a conveyor belt by two weldling jaws, (c) the conveyor belt is lowered until the first plastic bag slides in the second plastic bag as far as an already formed weld seam, and then the welding jaws are sealed, (d) surfaces of the at least one screen and the dosing balance at least partially comprise a hard metal, and (e) the shaper for forming the second plastic bag comprises a wear-reistant coating.