Abstract: A paperboard tray includes flanges which abut but do not overlap when the tray is erected. The flanges are connected to tray side wall panels along fold lines which are selectively scored to compensate for different stiffness of the paperboard material along and across its grain. The selectively scored fold lines allow the flanges to uniformly bend when subjected to equal bending forces exerted on the flanges. The abutting flanges and the selectively scored flange fold lines make the tray particularly suitable for use in manufacturing processes in which the tray is lined with a non-porous film material.

Abstract: A paperboard carton having a hinged or a flip top cover which extends down over the top of the carton and which has a double thickness front skirt with a slit extending across the center of the skirt, this slit positioned to overlie in the folded position a turned bound locking flange which is formed as a part of the front panel of the carton.

Abstract: A carton is provided having opposite side portions which project beyond the lower surface of carton. The lower surface is provided with apertures so that heat may pass through the apertures when the carton is placed in an oven or other heating chamber. A strip of film is secured to the lower surface and along an adjoining wall. The film normally closes the apertures, but is removable to expose the apertures.