Abstract: An apparatus for making laminated dual and multiple arch corrugated structures including a first unit for making single-face corrugated members formed of a corrugated member and an attached liner and a second unit for combining one or more single-face corrugated structures into a double-face structure. The subject invention includes a novel mechanism for laminating one or more portions of the single-face or double-face corrugated structures and/or for impregnating one or more of the members of the such structures with an impregnating substance. The subject improvements also reside in a novel hold down roll construction to prevent wrinkling of the edge portions of web members used in the construction of corrugated panels.

Abstract: A double-facer unit includes an applicator roller having a cylindrical outer surface with spaced depressions distributed relatively uniformly over the surface thereof, mechanisms for maintaining corrugation ridges opposite from the liner side of the single-face web against an arcuate portion of the outer surface of the applicator roller for applying adhesive thereto, and an adhesive container having adhesive therein exposed to the cylindrical surface of the applicator roller in the double-facer unit whereby the adhesive contained in the container is transferred to the surface of the applicator roller including into the depressions therein, a device associated with the adhesive container for scraping excess adhesive from the roller but not from the depressions whereby the adhesive remaining in the depressions is transferred to the corrugation ridges on the single-face web when in contact therewith, and mechanisms for maintaining predetermined tension on the single-face web during the time the adhesive in the d