CONSTRUCTION BOARD AND ITS MANUFACTURING METHOD

摘要

The invention relates to a longitudinal laminate board (1) of mineral wool to be used as a core of a sandwich element having surface layers preferably of thin sheet metal on each side. The laminate board consists of adjacently disposed rods (2) whose fibre plane form an essentially right angle to the plane of the laminate board. The rods are jointed within the laminate board, but the joints (3) are prepared so as to eliminate their weakening influence on the board. This has been achieved by matching the shape of the jointed end surfaces and connecting them. The end surfaces may be glued, compressed, form a finger joint, etc. in order to increase the strength of the joint. The invention also relates to a method for manufacturing the sandwich element. Having been cut from a mineral wool board, the rods are rotated (IIIa) 90.degree. and assembled (Va) with end surfaces facing each other into rods, are cut to a length equalling the one of the laminate board and are assembled into a laminate board onto which the surface layers are applied during lateral compression.