Wound sandwich tube with corrugated shell

• Main Author: VAN DE CAMP JOHANNES W
• Format: Patent
• Language: English
• Published: 14.12.2006
• Subjects: CONVEYING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HANDLING THIN OR FILAMENTARY MATERIAL; HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS,CABLES; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNERANALOGOUS TO PAPER; MAKING WOUND ARTICLES, e.g. WOUND TUBES, OF PAPER, CARDBOARDOR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; PACKING; PERFORMING OPERATIONS; STORING; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TRANSPORTING; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUSTO PAPER

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.