Patent ID: 6117265
Filing Date: 2000-09-12
Classification: B29C,B29L,Y10T

Abstract:
Method for heat-welding corners of lengths of profiles together, for sealing gaskets, where said profiles comprise at least one extendible or compressible air chamber, said profiles being cut at their ends according to a suitable angle, said method comprising:a) positioning two profiles, with one of the cut ends of each said profile opposite each other, inside a suitable device comprising clamps which make said positioning possible,b) heating said positioned ends until said positioned ends reach a softened state,c) choking said profiles so as to completely occlude said air chambers along choking sections, closing said clamps in order to cause said profiles to come into mutual mating contact at said heated ends, injecting air into said air chambers by perforating said air chambers in a region between the choking sections and the heated ends so as to apply pressure to walls of said profiles in that region, and pressing said walls against walls of the clamps, thus joining said heated ends by heat-welding under pressure,d) opening said occluded sections,e) heat-welding a cut free end of the heat-welded profiles with a third length of profile using steps a through d, andf) heat-welding a cut free end of the heat-welded profiles made in step e with a fourth length of profile using steps a through d so as to from a gasket frame which is heat-welded at its corners.