Abstract: A wound paperboard tube having enhanced burst strength in high-moisture conditions up to and including complete and prolonged submersion in liquid water comprises a plurality of paperboard plies formed from a pulp comprising papermaking furnish and an effective amount of a size such that the paperboard plies have reduced moisture add-on when submerged in water, relative to paperboard plies formed from a pulp comprising the identical furnish but without the size. The plies are wound one upon another about an axis of the tube and adhered together with a water-resistant adhesive comprising a polyvinyl composition containing a cross-linking agent for inducing cross-linking of the adhesive.

Abstract: A spirally wound tube having an intermediate zone defining one or more voids and a method of making such a tube. The tube is made by spirally winding a plurality of plies and mini-plies together forming an inner zone, intermediate zone, and an outer zone. Each zone has one or more layers of plies or mini-plies. More specifically, each intermediate layer includes a number of mini-plies spirally wound with gaps between adjacent mini-plies. Furthermore, the intermediate layers are radially aligned with each other such that the gaps of each layer form voids. Each void has a radial height substantially equal to the radial height of the intermediate layers combined or the intermediate zone.

Abstract: An improved support post for cushioning and supporting large products is provided. The post is made from a non-rectangular sheet that is convolutely wound around a mandrel and shaped into a desired cross-sectional shape. The post has a higher axial compression strength than a conventional post.

Abstract: A wound paperboard tube, a winding core, and methods for making same, wherein one or more corrugated plies are included in the tube wall so as to achieve a greater effective thickness per unit volume of material, and thereby reduce the cost per unit volume. In accordance with one embodiment of the invention, a winding core comprises a radially outer zone comprising at least two contiguous, non-corrugated plies wrapped one upon another about an axis and adhered together; a radially inner zone comprising at least two contiguous, non-corrugated plies wrapped one upon another about the axis and adhered together; and a radially intermediate zone comprising at least one corrugated ply having corrugations that are parallel to the axis. The intermediate zone of the winding core can include a plurality of corrugated plies that are contiguous, with corrugations of the contiguous corrugated plies nested in each other.

Abstract: A wound construction form comprising a plurality of flexible sheet material layers wound one upon another about an axis and bonded together to form a tube, wherein all of the flexible sheet material layers comprise transparent polymer film. The tube thus is transparent such that a settable composition poured into the tube can be seen through the tube wall. If an air bubble is present adjacent the wall, it can be eliminated while the composition is still fluid by puncturing the wall with a small hole at the bubble so that the air can escape and the composition can fill the void.

Abstract: A winding core capable of being made in relatively thick-walled configurations and yet capable of being readily collapsed into a flattened configuration for shipping or storage prior to use comprises a plurality of fibrous plies helically wound one atop another and adhered together to form a tube. The plies are arranged in two or more groups of two or more plies each. The plies of each group are adhered to one another over at least a substantial majority of their facing surfaces, but the adjacent groups are non-adhered to each other over at least a substantial majority of their facing surfaces.

Abstract: A wound tube comprising one, two, three, or more plies each having a cohesive layer for bonding the plies together. The plies are wrapped spirally about an axis to form a tube, which may then be cut to appropriate lengths. Once formed, the tubes may be used in a variety of applications including as cores for hygienic paper rolls.

Abstract: A tubular core and associated method of manufacture are provided. The tubular core includes at least one inner ply and at least two plastic plies disposed thereon. The inner ply, which can be paper or plastic, has an inner surface upon which identifying indicia are printed, for example, before the tube is formed and while the inner ply is in a flat configuration. The first and second plastic plies are disposed on the inner ply and adhered so that the second plastic ply substantially covers the inner ply and the first plastic ply.

Abstract: The present invention provides a low-density paperboard sheet of at least one paperboard layer made from a stock solution that includes a proportion of standard wood flour or fine sawdust in addition to traditional cellulose fibers. The proportion of sawdust can range from 1% to 40% by weight. Advantageously the sawdust of the present invention does not require a costly refining or micronization operation in order to produce low-density, high yield paperboard layers. Additionally, the low-density layers of the present invention may be readily combined with other layers of varying densities in order to tailor the physical properties of the resulting multi-layer sheet to a given application.

Abstract: An improved support post for cushioning and supporting large products is provided. The post is made from a sheet that is convolutely wound around a mandrel and shaped into a desired shape. The improvement comprises making the sheet from multiple thicknesses of paper so that, upon winding the sheet into a tube, the middle layer of the tube is thicker than the outer layers. The post has a higher axial compression strength than a conventional post, but the same amount (weight) of material.