Patent ID: 9725212
Date: 2017-08-08
CPC Classifications: B29C,B65B,B65D

Claim:
1. A method for packing polysilicon into a plastic bag from a PE film with a thickness of 150-900 μm, a stiffness at a flexural modulus F max of 300-2000 mN and F t of 100-1300 mN, having a fracture force F determined by dynamic penetration testing of 200-1500 N, a fracture energy W s of 2-30 J and a penetration energy W tot of 2.2-30 J, having a film tensile stress at 15% longitudinal and transverse elongation of 9-50 MPa, having an Elmendorf longitudinal film tear resistance of 10-60 cN and an Elmendorf transverse film tear resistance of 18-60 cN, having a longitudinal film elongation at break of 300-2000% and having a transverse film elongation at break of 450-3000, and is produced by means of an extruder from a tubular PE film, comprising production of the bag, sealing the PE film prior to filling the bag, filling the bag with polysilicon and welding the bag after filling the bag, wherein the sealing and welding steps are effected by time-controlled, temperature regulated pulse sealing with a contact pressure by means of welding jaws greater than 0.01 N/mm 2 , resulting in a weld seam having a weld seam strength of 25-150 N/15 mm, wherein in each sealing and welding operation, the sealing and welding temperatures are detected without a sensor through electrical resistance measurement of a metallic seal wire that is sheathed in a nonmetallic material and regulated, in order to ensure reproducible sealing results and a homogeneous sealing quality, especially in prolonged operation with high frequency.