foerfarande foer framstaellning av pappersindustrihylsor som aer av kartong och har i foerbaettrad chuckhaollfasthet och pappersindustrihylsa som aer av kartong och konstrverad enligt in foerfarande

摘要

A method of fabricating paperboard cores, and the paperboard cores so fabricated, have improved chuck strength and can be used with chucks rotating at a speed of at least 200 mm/min., even with paper rolls having a weight of over 8.5 tons. A plurality of paperboard plies (e.g. made by press drying) are wound spirally around a mandrel into a tube to produce a paperboard core having a cylindrical surface and inside diameter and a wall thickness of 10 mm or more. The method is practiced so as to fulfill the following conditions: (1) the inside diameter of the paperboard core being 73 mm to 110 mm, Lmp1550 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, Lmp1900 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, Lmp2450 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, Lmp4500 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 meter of the paperboard core.