| 摘要 |
The present invention relates to a method of fabricating paperboard cores which have improved chuck strength and which are intended for the paper industry. The invention also relates to a paperboard core fabricated by this method. A spiral paperboard core is fabricated by winding paperboard plies spirally around a mandrel into a tube, whereby on the cylindrical surface representing the z-direction stress maximum in the wall of a finished paperboard core, and in the vicinity of said cylindrical surface, including the paperboard ply in the middle of the wall, the following applies in a 1 m long paperboard core, with (1) the inside diameter of the paperboard core being 73 mm to 110 mm, Lmp < 1550 mm, preferably less than 1450 mm, and more preferably less than 1300 mm; with the inside diameter of the paperboard core being 111 mm to 144 mm, Lmp < 1900 mm, preferably less than 1650 mm, and more preferably less than 1500 mm; with the inside diameter of the paperboard core being 145 to 180 mm, Lmp < 2450 mm, preferably 2200 to 1500 mm, and more preferably less than 1500 mm; and with (4) the inside diameter of the paperboard core being 181 mm to 310 mm, Lmp < 4500 mm, preferably less than 3900 mm, and more preferably 3900 mm to 2000 mm, where Lmp is the web edge length of the paperboard ply on the cylindrical surface representing the z-direction stress maximum in the wall of a paperboard core per 1 linear metre of the paperboard core. |
