Abstract: A means of making a multi ply structural panel by eliminating the top liner in the corrugating process. The present invention is made possible through modification to the corrugating rolls of the singlefacer. The design modification to the rolls involves incorporation of slots that run around the circumference of one roll and mating creasing tools incorporated around the circumference of the other of the corrugated roll set. These slots and creasing tools are incorporated across the existing flutes of the corrugating rolls.

Abstract: An apparatus for production of a two-ply paperboard panel is provided. The apparatus comprises a supply of top paperboard panel web. A flap-cutting die cut module receives the top paperboard panel web and cuts a pattern of flaps therein. A flap-forming die roll in juxtaposition with a flap-receiving pocket roll defines an interface therebetween through which the top paperboard panel web is received. An adhesive-application station applies adhesive to surfaces of flaps formed on the top paperboard panel web. A supply of bottom paperboard panel web is provided, which is joined to the top paperboard panel web at a web-merging station. A hold-down system holds the top and bottom paperboard panel webs together while applied adhesive sets or cures. A method for producing a two-ply paperboard panel is also disclosed.

Abstract: A means of making a multi ply structural panel by eliminating the top liner in the corrugating process. The present invention is made possible through modification to the corrugating rolls of the singlefacer. The design modification to the rolls involves incorporation of slots that run around the circumference of one roll and mating creasing tools incorporated around the circumference of the other of the corrugated roll set. These slots and creasing tools are incorporated across the existing flutes of the corrugating rolls.