Patent ID: 6391135
Filing Date: 2002-05-21
Classification: B29C,B29K,B29L,B31C,B65D

Abstract:
A method of manufacturing multi-ply tubular containers for products comprising the steps of:advancing a continuous body ply formed of paperboard towards a shaping mandrel; applying an aqueous adhesive to a surface of the paperboard body ply; heating the aqueous adhesive to evaporate at least a portion of the water content and render the adhesive substantially tacky; advancing a continuous polymeric liner ply having a moisture barrier layer towards the shaping mandrel, the liner ply having a thickness of less than about 3 mils, and the liner ply having opposite first and second marginal edge portions; passing the continuous polymeric liner ply in face-to-face contact with the adhesive surface of the body ply through a pair of nip rollers to immediately adhere the liner ply to the body ply so that a substantially equal circumferential length of the liner ply is adhered to the inner surface of the body ply when in a flat state; and then wrapping the body ply and adhered liner ply around the shaping mandrel to create the tubular container so that the first and second marginal edge portions of the liner ply cooperate with one another to define a straight overlap seam, wherein the liner ply has a substantially smooth surface prior to said wrapping step and said wrapping step includes circumferentially compressing the liner ply relative to the body ply so that the substantially smooth surface becomes a wrinkled surface during said wrapping step.