The manufacturing process of the nuclei of cardboard for the paper industry, use of the process, the core of corrugated cardboard for the paper industry or other and the use of a cardboard core spiral

摘要

b Mu manufacturing process of nuclei of cardboard for the paper industry, use of the process.The core of corrugated cardboard for the paper industry or other and the use of a cardboard core spiral MV d the present invention relates to a process for the manufacture of cardboard cores which are)Tados length of mandrel, perfected and intended for paper industry. The invention also relates to a cardboard core manufactured by this process.A cardboard core spiral is manufactured by winding layers of cardboard in a spiral around a mandrel into a tube.By the cylindrical surface which represents the maximum stress in the Z direction on the wall of a core of cardboard over and in the vicinity of the said cylindrical surface.Including the layer of cardboard in the middle of the wall, the following applies on a core of corrugated cardboard 1 metre long, with (1) the internal diameter of the core of cardboard and 73 mm to 110 mm.L ~ PM ~ 1550 mm, preferably less than 1450 mm, preferably smaller than 1300 mm; (2) with the internal diameter of the core of cardboard and 111 mm to 144 mm, PML 1900mm, preferably.1650 mm, and most preferably less than 1500 mm; (3) with the internal diameter of the core of cardboard and 145 to 180 mm, l ~ PM ~ 2450 mm, preferably, 2200 to 1500 mm,And more preferably less than 1500 mm; and (4) the internal diameter of the core of cardboard and 181 mm to 310 mm, l ~ PM ~ 4500 mm, preferably smaller than 3900 mm, and more preferably,3900 mm to 2000 mm, where l ~ PM ~ is the length of the edge of the texture of the layer of cardboard in the cylindrical surface which represents the maximum tension in the Z direction on the wall of a core of corrugated cardboard.For a linear metre of the core cardboard.