Method of producing an insulation product and a product obtained by said method
The present invention concerns a method of producing an insulation product comprising a board of porous insulation material wrapped in a gas-impermeable foil, said method comprising the steps of providing a succession of porous insulation material boards on a first conveyor apparatus and feeding the boards on a second conveyor apparatus; providing wrapping foil and wrapping said foil to form a tube around the boards on said second conveyor apparatus, flushing the boards with an insulating gas, and sealing the wrapping foil at the ends of each board transverse to the direction of travel of the second conveyor apparatus.
1. A method of producing an insulation product comprising a board of porous insulation material wrapped in a gas-impermeable foil, the method comprising the steps of:
providing a succession of porous insulation material boards on a first conveyor apparatus and feeding the boards on a second conveyor apparatus;
providing wrapping foil and a flow-wrapping apparatus on the second conveyor apparatus, and wrapping the wrapping foil to form a tubular wrapping foil with a tubular configuration around the boards on the flow-wrapping apparatus on the second conveyor apparatus;
flushing the boards with an insulating gas; and then
sealing the wrapping foil at a front end and a rear end of each board transverse to a direction of travel of the second conveyor apparatus.
2. The method according to claim 1 , further comprising pre-compressing the porous insulation material on the first conveyor apparatus, the pre-compressing being within a range of 5-20% of a nominal thickness of the porous insulation material.
3. The method according to claim 2 , wherein the pre-compression is maintained until the step of sealing of the wrapping foil at the front end and the rear end of the board has been performed.
4. The method according to claim 1 , further comprising pre-heating the porous insulation material on the first conveyor apparatus.
5. The method according to claim 1 , further comprising preheating the insulating gas to obtain a pre-heated insulating gas prior to flushing an interior of the tubular wrapping foil with the pre-heated insulating gas.
6. The method according to claim 5 , wherein the step of flushing further comprise flushing the interior of the tubular wrapping foil and the boards with the insulating gas.
7. The method according to claim 6 , wherein the step of flushing substitutes between 80-98% of an air inside the tubular wrapping foil and the boards with the insulating gas.
8. The method according to claim 5 , further comprising selecting the insulating gas from the group consisting of Carbondioxide (CO 2 ), Argon or other gases having thermal conductivity lower than air.
9. The method according to claim 1 , wherein the wrapping foil is a multilayer plastic foil, and the step of forming the tubular wrapping foil further comprises longitudinal welding of the wrapping foil.