Folding boxes and blanks, particularly in regard to sealing by means of a thermoplastic coating preapplied to both sides thereof

Claim 1

THE END CONSTRUCTION OF A FOLDING BOX OF PAPERBOARD COMPRISING A BOTTOM PANEL; A PAIR OF SIDE PANELS ARTICULATED TO OPPOSITE SIDES OF THE BOTTOM PANEL, AN END PANEL ARTICULATED TO ONE END OF THE BOTTOM PANEL ALONG A BOTTOM END FOLD LINE AND A PAIR OF CORNER LOCK FLAPS ARTICULATED TO SAID SIDE PANELS ALONG CORNER FOLD LINES AND FOLDED OVER THE END PANEL; A COVER PANEL; AND A COVER FLAP ARTICULATED TO SAID COVER PANEL IN A POSITION TO OVERLIE SAID END PANEL AND SAID CONRNER FLAPS AT LEAST PARTIALLY, IN WHICH SAID BOTTOM END FOLD LINE COMPRISES THREE PORTIONS, VIZ., A CENTRAL PORTION AND TWO TERMINAL PORTIONS, SAID CENTRAL PORTION BEING OFFSET TOWARD THE OUTSIDE OF THE BOX WITH RESPECT TO AN IMAGINARY CHORD CONNECTING THE FAR ENDS OF THE TERMINAL PORTIONS, A CURVATURE RESULTING IN THE END PANEL WHEN FOLDED AT SAID BOTTOM END FOLD LINE WITH RESPECT TO THE BOTTOM PANEL, SAID CURVATURE BEING CONVEX AS VIEWED FROM THE BOX OUTSIDE WHICH CURVATURE BRINGS THE CENTRAL PORTION OF THE WALL PANEL INTO SUBSTANTIALLY THE SAME PLANE AS THE CORNER LOCK FLAPS WHICH OVERLIE THE END PORTIONS OF THE WALL PANEL ADJACENT SAID CORNER FOLD LINES.