Patent ID: 6863949
Filing Date: 2005-03-08
Classification: B29C,B29K,E04B,F16L,Y02A,Y02B,Y10S,Y10T

Abstract:
1. A flat sided, substantially prismatic thermal insulation element having a pair of major, opposite, outer faces and surrounding end faces, the insulation element including a preformed, porous core completely enveloped in a single sheet of a gas tight foil and evacuated, the insulation element comprising: (a) a welded seam joining contiguous layers of the foil and extending across only one major outer face of the insulation element between opposite end faces; (b) a pair of welded seams joining contiguous layers of the foil forming a weld flange, each of the pair of welded seams extending parallel to said major face and along only said opposite end faces; and (c) a fold in the enveloping sheet at each end of each of said opposite end faces, the fold having fold lines forming a first triangle having a right angled apex and a base along an end edge of an end face and having a total of five fold lines converging at the apex of the first triangle, two of the five fold lines bordering the first triangle, another two of the five fold lines being symmetrically positioned and bordering areas folded over part of the first triangle, and the fifth fold line of the five fold lines extending radially outwardly through an adjoining one of the pair of welded seams.