| 主权项 |
1. A method of forming a pouch containing a gas, the method comprising:
drawing a first elongated sheet of gas-impermeable material from a supply of the material in a drawing direction, wherein the sheet of material has a transverse profile perpendicular to the drawing direction that includes a channel; drawing a second elongated sheet of material, such that a first portion of the first sheet and a first portion of the second sheet are substantially parallel to each other; injecting the gas between the first portion of the first sheet and the first portion of the second sheet, wherein the gas is injected between side edges of the first portions of the first and second sheets; sealing first and second lengths of the first and second sheets to each other, wherein the first and second lengths are substantially parallel to the drawing direction, to form first and second side edges of the pouch; and sealing third and fourth lengths of the first and second sheets to each other, wherein the third and fourth lengths are substantially perpendicular to the drawing direction, to form first and second end edges of the pouch. |
