Patent ID: 6129655
Filing Date: 2000-10-10
Classification: B31F,B65H

Abstract:
A method of folding and shaping a sheet comprising:supplying a sheet having a plurality of parallel fold-lines with directional folding permanency imparted at each of said fold-lines whereby the sheet assumes a corrugated configuration with alternating folds at said fold-lines defining panels therebetween in a relaxed state;supporting the folds at one surface of said sheet in the relaxed state on a plurality of parallel spaced support bars with said folds oriented transverse to said support bars;applying a folding pressure to opposing edges of said sheet, in a direction perpendicular to said fold-lines, to cause said opposing edges to move together to fold with said panels coming together;applying a pressing force to the folds at the surface of said supported sheet opposite said one surface with a plurality of parallel spaced pressing bars oriented parallel to said support bars, simultaneously with application of said folding pressure; andmoving one of said plurality of support bars and plurality of pressing bars away from the other as said opposing edges are moved together.