# US 2014/0151259 A1 · Packing of polysilicon

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- Number: US 2014/0151259 A1
- Document ID: US20140151259A1
- Status: Published application
- Kind: A1
- Application number: 14/072,277
- Filed: 2013-11-05
- Published: 2014-06-05
- Earliest claimed: 2012-12-04
- Assignees: Wacker Chemie AG
- Applicants: Wacker Chemie AG
- Inventors: Hanns WOCHNER
- Web page: https://patentgrep.com/patent/US20140151259A1

## CPC

- B65D 33/00: Details of, or accessories for, sacks or bags
- B29C 65/222: {comprising at least a single heated wire}
- B29C 65/38: Impulse heating
- B29C 66/43121: {Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags (closing tube ends B29C57/10)}
- B29C 66/71: {characterised by the composition of the plastics material of the parts to be joined (welding bar compositions B29C65/125)}
- B29C 66/9241: {by controlling or regulating the pressure, the force or the mechanical power}
- B29C 66/929: {characterized by specific pressure, force, mechanical power or displacement values or ranges}
- B65B 3/04: Methods of, or means for, filling the material into the containers or receptacles
- B65D 75/38: Articles or materials enclosed in two or more wrappers disposed one inside the other {(for shock absorbing purposes B65D81/03; for thermal insulating purposes B65D81/3893)}
- B65D 75/52: Details
- B65D 81/00: Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B29C 65/7433: {the tool being a wire}
- B29C 66/1122: {Single lap to lap joints, i.e. overlap joints (B29C66/45, B29C66/472, B29C66/52272 take precedence)}
- B29C 66/723: {being multi-layered (B29C66/7292, B29C66/72941 take precedence)}
- B29C 66/8122: {characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps}
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B65B: MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING (bundling and pressing devices for cigars A24C1/44; devices for tensioning and securing binders adapted to be supported by the article or articles to be bound B25B25/00; applying closure members to bottles, jars or similar containers B67B1/00-B67B6/00; concurrent cleaning, filling and closing of bottles B67C7/00; emptying bottles, jars, cans, casks, barrels or similar containers B67C9/00)

## Abstract

A bag contains polysilicon, has been welded and includes at least one weld seam and a polyethylene film having: a thickness of 150-900 μm; a stiffness at a flexural modulus Fmax of 300-2000 mN and Ft of 100-1300 mN; a fracture force F determined by dynamic penetration testing of 200-1500 N; a fracture energy Ws of 2-30 J; a penetration energy Wtot of 2.2-30 J; a film tensile stress at 15% longitudinal and transverse elongation of 9-50 MPa; an Elmendorf longitudinal film tear resistance of 10-60 cN; an Elmendorf transverse film tear resistance of 18-60 cN; a longitudinal film elongation at break of 300-2000%; a transverse film elongation at break of 450-3000%; and a weld seam strength of 25-150 N/15 mm. A method includes filling a bag with polysilicon, and welding by pulse sealing with contact pressure greater than 0.01 N/mm2 to obtain a 25-150 N/15 mm weld seam strength.

## Claims

### Claim 1

A bag which contains polysilicon and has been welded such that the bag includes at least one weld seam, said bag comprising a polyethylene film having: (a) a thickness of 150-900 μm, (b) a stiffness at a flexural modulus Fmax of 300-2000 mN and Ft of 100-1300 mN, (c) a fracture force F determined by dynamic penetration testing of 200-1500 N, (d) a fracture energy Ws of 2-30 J (e) a penetration energy Wtot of 2.2-30 J, (f) a film tensile stress at 15% longitudinal and transverse elongation of 9-50 MPa, (g) an Elmendorf longitudinal film tear resistance of 10-60 cN, (h) an Elmendorf transverse film tear resistance of 18-60 cN, (i) a longitudinal film elongation at break of 300-2000%, (j) a transverse film elongation at break of 450-3000%, and (k) a weld seam strength of 25-150 N/15 mm.

### Claim 2

A method for packing polysilicon into a plastic bag by filling the bag with polysilicon and welding the bag, which comprises effecting the welding by pulse sealing with a contact pressure by using welding jaws greater than 0.01 N/mm2, resulting in a weld seam having a weld seam strength of 25-150 N/15 mm.