Abstract: An apparatus for the cutting and creasing of plastics material sheet is disclosed which comprises a cutting and creasing tool and a corresponding plate arranged for mutual contact characterized in that the plate is free of raised surfaces and is covered with a plastic material, preferably nylon. Additionally, an apparatus for preheating corrugated plastics sheet material is described which comprises a flat bed portion adapted to receive a stack of precut corrugated sheet material blanks with their direction of corrugation aligned, heating means at at least one end of the stack, and fan means at at least one end of the stack, the heating and fan means being arranged such as to direct heated air along the corrugation of at least some of the sheets in the stack and back via the remainder of the sheets in the stack in an endless loop.

Abstract: This invention relates to a corrugated thermoplastic blank for a container. The blank (20) has a base panel (24) with wall panels (26, 28, 30, 32) connected to the base panel (24) by fold lines (38). The fold lines (38) comprise weld lines which destroy the original memory of the thermoplastic material. The free edges of the blank are sealed by seals (38) which prevent water from entering the blank. The sealed free edges and/or the weld lines or line (38) surround and reinforce each panel (26, 28, 30, 32) and increase the strength of each panel and thereby the strength of a container erected from the blank.