Abstract: 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.

Abstract: 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.

Abstract: A re-usable yarn carrier includes a tube having an annular recess formed in an outer peripheral surface adjacent one end of the tube. The annular recess defines a marking surface located radially inward from the outer peripheral surface. The marking surface includes markings, for example, colored bands, bar code or the like, for identifying at least one characteristic of the yarn wound onto the carrier. The marking surface may further include a knurled surface, slip-resistant coating, hooks or the like, for catching the yam at the start of the winding operation.

Abstract: A textile core for winding a package of yarn. The textile core includes a tubular body having opposed ends and a bodywall formed of a paperboard material. To prevent slippage of a transfer bunch or tail formed on the core during winding processes, a plurality of spaced, discreet perforations are provided on the exterior periphery of the tubular body adjacent at least one end thereof. The perforations extend substantially around the circumferential periphery of the tubular body, and extend radially into the bodywall for only a portion of the thickness thereof. A projection adjacent each perforation is also provided, extending radially outwardly from the bodywall and formed of paperboard material removed from the adjacent perforation. The projections are capable of frictionally engaging at least one yarn winding formed on the top thereof and thus prevent slippage of the transfer tail.