Abstract: A multi-ply paperboard comprising at least one ply of conventional cellulose fibers and from about 0.1 to about 6 weight percent of a water-borne binding agent; and at least one ply containing up to 20% of chemically intra-fiber crosslinked cellulosic high-bulk fibers and from about 0.1 to about 6 weight percent of a water-borne binding agent. The water-borne binding agent may be a starch, a modified starch, a polyvinyl alcohol, a polyvinyl acetate, a polyethylene/acrylic acid copolymer, an acrylic acid polymer, a polyacrylate, a polyacrylamide, a polyamine, guar gum, an oxidized polyethylene, a polyvinyl chloride, a polyvinyl chloride/acrylic acid copolymer, an acrylonitrile/butadiene/styrene copolymer or polyacrylonitrile. A method for making the paperboard is disclosed.

Abstract: A process of reinforcing a polyethylene coated blank in which a reinforcing stripe is applied to a polyethylene coated web along a longitudinal score line which is to be scored. The web is thereafter scored along the line and the blank is cut from the web. The reinforcing stripe has a major portion of polyethylene, a small amount of vinyl acetate and a polypropylene/polyisobutylene copolymer. During the application, the stripe material has a viscosity of 18,000-26,000 centipoise.

Abstract: A reinforced blank for liquids and a method of producing said blank. The score lines which hinge the bottom closure panels to the side walls is reinforced. The container has a polyethylene coating and the reinforcing material must be compatable with the polyethylene coating. It must be able to stick to the polyethylene. It must be able to be processed and placed on the polyethylene within the existing process. It must have a quick cure time, around a half second, and it must be nonflammable because of the flame sealers used to later form the container. It must be easy to apply at speeds of about 600 feet a minute and it must be a resin that does not activate. The resins applicable have viscosities from 18,000 to 26,000 centipoises and have from 65-85% polyethylene, a small amount of vinyl acetate as either polyvinyl acetate or ethyl vinyl acetate and the remainder a polypropylene/polyisobutylene copolymer.