Patent ID: 7060158

Claim:
A process for the manufacture of decorative boards, each of said boards includes a decorative layer, wherein a decor sheet is placed as a surface layer on a base layer and bonded thereto by pressing under elevated temperature and pressure wherein; a) the decor sheet is cut to a predetermined format from a web, the cut being arranged on a fixed position related to possible repetition frequency of a decor pattern of the web whereupon, b) the decor sheet is accurately placed on a base layer selected from the group consisting of particle board, MDF and HDF, the base layer being preconditioned to a predetermined moisture content and temperature prior to being contacted by the decor sheet; whereupon, c) the decor sheet is fixed to the base layer whereupon, d) a number of base layers with attached decor sheets are, one after the other, fed in between the belts of a continuous laminate press, together with an uppermost wear layer, such that the base layers, the decor sheets and the wear layer are laminated together under heat and pressure in the laminate press to form a laminate wherein: the continuous wear layer is cut by means of a cutting device after the lamination procedure at a position between two adjacent base layer sheets; the cutting device is guided by means of an ultrasonic sensor, identifying a gap between two adjacent base sheets; at least one longitudinal edge is cut to form a reference edge of the laminate; the decorative boards further comprise a wear layer which is constituted by at least one web of cellulose impregnated with melamine formaldehyde resin and provided with small aluminium oxide particles which wear layer web is continuously fed from a roll in between the belts of the continuous laminate press together with the base layer sheets and decor sheets and the longitudinal edge cut is guided by means on a reference printed on the decor sheet.