| 摘要 |
<p>Process to coat panels (10) consisting of wood or of a foam or composite material or of a base of wood fibres with a finishing film of a material suitable to be hot-moulded and to adhere to one face (31) of the panels (10) by means of an adhesive, the process comprising a pressing step in which at least one panel (10) is borne on a conveyor (11) into a hot-pressing device consisting of pairs of rolls (15-16), at least one roll in each pair being at least partially coated with a heat-resistant elastomeric material, the pressing step being preceded by a convection heating step to heat an assembly consisting of the panel (10), adhesive and thermoplastic finishing film, during which the thermoplastic finshing film and the adhesive are softened homogeneously by convection, the pressing step by means of rolls (15-16) taking place at a substantially constant temperature in a chamber (13) with temperature restoration means (21) and being followed by a forced-draught cooling step acting at least on the aforesaid face (31) of the panel (10) when leaving the pressing device. Device (27) to press panels which is suitable for employment in performing a process according to the above description and comprises at least two pairs of superimposed rolls (15-16), at least one roll (15) in each pair of rolls (15-16) being provided with a coating of an elastomeric material, whereas the other roll (16) in the pairs of rolls (15-16) has a smooth surface and is fitted so as to be able to idle on a rigid support.</p> |
