Sonoco Development Incorporated

Wim Van De Camp

Xiaokai Niu

Lawrence E Renck

David E Rhodes

Terry D Gerhardt

John F Auten

Clifford A Bellum

Yiming Wang

Angela Adams

Winding cores for elastically stretched or shrinkable materials are designed to significantly reduce the amount of roll strain energy developed during winding. This is accomplished by building into the core an energy-absorbing zone that can be collapsed by a substantial amount and in a relatively controlled fashion over a substantial period of time under the influence of a continued radially inward pressure exerted by the roll of wound material. The energy-absorbing zone is formed by one or more collapsible layers having repeated atomic regions projecting out of a plane of the sheet and each defining a plurality of normal vectors in different sub-regions of the atomic region, wherein the normal vectors, when projected onto the two-dimensional plane of the sheet, are in a plurality of different directions in the plane.

Winding cores for material rolls having high roll strain energy, and method for making same

A winding core, a winding core assembly for winding web materials, and a method are provided. The winding core includes a hollow cylindrical core member having an inner surface, an outer surface, and first and second ends. A chuck-engaging layer is located on the inner surface of the core member, wherein the chuck-engaging layer is softer than the core member.

Winding core and associated method

A stackable winding core in accordance with the invention has a male end and an opposite female end. The ends are configured in such a manner that they do not hinder or prevent the insertion of chucks or mandrels into the core for winding or unwinding of web material about the core. The male end of one core is receivable into the female end of another core so that the cores can be axially stacked end-to-end, the engagement between the ends of the cores keeping the core coaxially aligned with each other. The ends are also configured to support axial loads exerted between the cores.

Stackable winding core and method of making same

There is provided a paperboard tube structure with an intermediate ply having cut-and-folded tabs to increase the effective thickness of the intermediate ply. The paperboard tube includes a plurality of paperboard plies wrapped one atop another about an axis with the intermediate ply positioned between an interior paperboard ply and an exterior paperboard ply. A plurality of cut-and-folded tabs are each created by a nonlinear incision in the intermediate ply that extends from a first endpoint to a second endpoint thereby creating a folding axis along a line from the first endpoint to the second endpoint. The tab is folded about the folding axis to overlie a region of the intermediate ply adjacent the folding axis. The tabs increase the effective thickness of the wall of the paperboard tube. Therefore, the bending stiffness of the paperboard tube is increased compared to a tube without cut-and-folded tabs or the tube requires less paperboard ply material to maintain an approximately equal bending stiffness as a tube without cut-and-folded tabs.

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Hartsville, SC, United States of America

Wim Van De Camp