Patent ID: 8281558

Claim:
A method for the production of a panel-shaped evacuated heat insulation element, enclosed in film of the form of a flat film bag ( 1 ) filled with an unmolded, loose powder ( 4 ), the method comprising the steps of: a) providing a filter material ( 8 ) which is folded or preformed in the shape of a trough with one open side face, the length of the trough corresponding to the width of the evacuated heat insulation element and the width of the trough corresponding to the thickness of the evacuated heat insulation element; b) in the area of an opening ( 6 ) on one side of the film bag ( 1 ), the trough-shaped filter material ( 8 ), which is air-permeable but impermeable to powder dust ( 4 ), being fixed to an internal face of the film bag ( 1 ) such that the bag's interior is sealed off in a dust-tight manner but adapted to permit air to exit; c) evacuating the interior of the dust-tight, filled sealed film bag; and d) sealing the evacuated film bag in an airtight manner under a vacuum.