Abstract: A composite core tube is provided for the winding of a web of material. A hollow cylindrical core is covered by a water-resistant rigid sleeve in a heat fit manner to provide a winding surface. The sleeve is selected and finished to control the winding characteristics of the core.

Abstract: A yarn support tube for supporting elastomeric yarns of the type having finish oil or emulsion applied to the yarn includes a tube core of paperboard, and an outer ply formed by spirally winding a laminated strip onto the tube core such that a butt joint is formed between edges of adjacent spiral turns of the strip. The laminated strip is formed of an inner paper layer and an outer layer of polypropylene film or the like which is substantially impervious to the finish emulsion. A sealing strip of polypropylene or the like, also substantially impervious to the finish emulsion, is spirally wound onto and adhered to the outer ply of the tube such that the strip spans and sealingly covers the butt joint. The sealing strip and polypropylene film layer cooperate to prevent finish emulsion from migrating into the tube core.

Abstract: A concrete column forming tube and method of making same for receiving poured concrete column therein to produce a concrete column is characterized by a smooth inside coated surface in the forming tube to eliminate spiral seam lines and other undesirable characteristics on the outside surface of the formed concrete column. The tube is formed from spirally-wound plies of paper adhered together and has a centrifugally-cast epoxy resin coating sprayed onto the inside surface of the spirally-wound tube while the tube is rotating to produce a smooth inside coated surface on the forming tube.