Packing polycrystalline silicon

Patent metadata

Field	Value
Publication number	US-9550607-B2
Application number	US-201314095296-A
Country	US
Kind code	B2
Filing date	Dec 3, 2013
Priority date	Dec 14, 2012
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

The present invention relates to a method for packing polysilicon in the form of chunks by introducing the chunks into a first plastic bag, the first plastic bag being introduced into a second plastic bag after the introduction of the chunks, or the first plastic bag already having been inserted into the second plastic bag prior to the introduction of the chunks into the first plastic bag, as a result of which the chunks are present in a double bag which is sealed, wherein the air present in the two plastic bags in the double bag after the introduction of the chunks is removed before the sealing of the double bag such that the total volume of the double bag relative to the volume of the chunks is 2.4 to 3.0.

First claim

What is claimed is:

1. A method for packing polysilicon in a form of chunks, said method comprising:
(a) introducing the chunks into a first plastic bag, wherein the first plastic bag is introduced into a second plastic bag after the introducing of the chunks, or the first plastic bag has been inserted into the second plastic bag prior to the introducing of the chunks into the first plastic bag, as a result of which the chunks are present in a double bag;
(b) removing air from the double bag after the introducing of the chunks and before sealing the double bag such that a total volume of the first plastic bag relative to the volume of the chunks is 2.0 to 2.7 and a total volume of the double bag relative to the volume of the chunks is 2.4 to 3.0.

2. The method as claimed in claim 1 , wherein dimensions of the first plastic bag are such that a plastic film of the first plastic bag fits close to the chunks.

3. The method as claimed in claim 1 , wherein air is removed from the plastic bags by compressing the plastic bags with a clamp, a ram device, a suction device or a vacuum chamber.

4. The method as claimed in claim 1 , wherein a relative air humidity during the method is 30-70%.

5. The method as claimed in claim 1 , wherein each of the two plastic bags in the double bag is sealed separately by welding after the air removing.

6. The method as claimed in claim 1 , wherein the two plastic bags in the double bag are sealed by welding with a common weld seam.

7. The method as claimed in claim 1 , wherein the introducing of the chunks into the first plastic bag is followed by removal of air from the first plastic bag, by sealing of the first plastic bag and introduction into the second plastic bag, so as to give rise to the double bag, and then by removal of air from the second plastic bag and sealing thereof.

8. The method as claimed in claim 1 , wherein dimensions of the first plastic bag are such that a plastic film of the first plastic bag fits close to the chunks.

9. The method as claimed in claim 8 , wherein air is removed from the plastic bags by compressing the plastic bags with a clamp, a ram device, a suction device or a vacuum chamber.

10. The method as claimed in claim 9 , wherein a relative air humidity during the method is 30-70%.

11. The method as claimed in claim 10 , wherein each of the two plastic bags in the double bag is sealed separately by welding after the air removing.

12. The method as claimed in claim 11 , wherein the two plastic bags in the double bag are sealed by welding with a common weld seam.

13. The method as claimed in claim 12 , wherein the introducing of the chunks into the first plastic bag is followed by removal of air from the first plastic bag, by sealing of the first plastic bag and introduction into the second plastic bag, so as to give rise to the double bag, and then by removal of air from the second plastic bag and sealing thereof.

14. A double bag, comprising a first and a second plastic bag and polysilicon in a form of chunks present in the first plastic bag, wherein the first plastic bag is positioned within the second plastic bag, both plastic bags are sealed, wherein a total volume of the first bag relative to the volume of the chunks is 2.0 to 2.7 and a total volume of the double bag relative to the volume of the chunks is 2.4 to 3.0.

15. The double bag as claimed in claim 14 , wherein the first and the second plastic bags are sealed by welding and have a common weld seam.

Assignees

• Wacker Chemie Ag

Inventors

• Vietz Matthias
• Lichtenegger Bruno
• Pech Reiner

Classifications

• B65B1/28

  Controlling escape of air or dust from containers or receptacles during filling · CPC title

• B65B5/067 Primary

  in bags (B65B5/061 - B65B5/065 take precedence) · CPC title

• B65B51/146

  Closing bags · CPC title

• B65B31/04

  Evacuating, pressurising or gasifying filled containers or wrappers by means of nozzles through which air or other gas, e.g. an inert gas, is withdrawn or supplied · CPC title

• B65B25/00

  Packaging other articles presenting special problems (bundling B65B27/00) · CPC title