Method and joint for forming tubes from corrugated material

Claim 1

THE METHOD OF JOINING FIRST AND SECOND LONGITUDINAL EDGES OF A TUBE FORMED FROM A PIECE OF PLIABLE AND EXPANSIBLE CORRUGATED MATERIAL HAVING PLANE SIDE SURFACED RIDGES AND FURROWS ON BOTH SIDES EXTENDING SUBSTANTIALLY PARALLEL WITH SAID LONGITUDINAL EDGES OF SAID MATERIAL AND WHEREIN SAID SECOND LONGITUDINAL EDGES IS FORMED ALONG A CORNER OF A BISECTED RIDGE OF SAID MATERIAL WHICH COMPRISES FLATTENING A PLURALITY OF RIDGES FORMED ADJACENT SAID FIRST LONGITUDINAL EDGE OF SAID MATERIAL, APPLYING AN ADHESIVE COATING TO ONE SIDE OF THE FLATTENED SURFACE OF SAID FIRST EDGE OF SAID MATERIAL AND TO THE INSIDE PLANE SURFACE OF THE BISECTED RIDGE OF SAID SECOND EDGE OF SAID MATERIAL, OVERLAPPING SAID SECOND EDGE OF SAID MATERIAL OVER SAID ADHESIVE COATED SIDE OF SAID FIRST EDGE OF SAID MATERIAL, DISPOSING SAID PLANE SURFACE OF SAID BISECTED RIDGE OF SAID SECOND EDGE OF SAID MATERIAL ADJACENT THE PLANE SIDE SURFACE OF SAID FIRST ROW OF RIDGES ON SAID FIRST EDGE OF SAID MATERIAL TO FORM AN OUTER TUBULAR CORRUGATED SURFACE OF EQUALLY SPACED RIDGES AND FURROWS, AND APPLYING HEAT AND PRESSURE TO SAID FIRST AND SECOND EDGES OF SAID MATERIAL TO DRY THE ADHESIVE AND SECURE SAID LONGITUDINAL EDGES OF SAID TUBE TOGETHER TO FORM A PLIABLE AND EXPANSIBLE TUBE.