| 摘要 |
The present invention relates to a method of manufacturing a core, especiall y a spiral core, from superimposed plies of board produced by winding, glueing , and drying such, whereby the moisture contents of at least some of the board plies entering the winding stage differ from each other in order to provide a stepwise moisture structure within the core wall. This decreases unfavourabl e stresses which are produced in the drying stage if a core is manufactured fr om plies having equal moisture contents. |
