Patent EP-2415601-A2 (EP)
Inventor: WAAS ALFRED
IPC: B32B3/28
Filed: 2011-08-02
Abstract: The method for producing a sandwich board having a core layer or a middle layer (14) arranged between two cover layers, comprises fixedly connecting the core- or middle layer with the cover layers, where the middle layer is area-wisely formed in such a way that the middle layer forms a defined cavity structure between the both cover layers, applying and/or inserting the middle layer in a workpiece reception device (4), subsequently coating the middle layer with adhesive at both sides in defined middle layer areas in a flat manner, and feeding the coated middle layer to a pressing device (5). The method for producing a sandwich board having a core layer or a middle layer (14) arranged between two cover layers, comprises fixedly connecting the core- or middle layer with the cover layers, where the middle layer is area-wisely formed in such a way that the middle layer forms a defined cavity structure between the both cover layers, applying and/or inserting the middle layer in a workpiece reception device (4), subsequently coating the middle layer with adhesive at both sides in defined middle layer areas in a flat manner, and feeding the coated middle layer to a pressing device (5) by using a transferring device (10), where the both cover layers are simultaneously connected and/or pressed with the middle layer in the pressing device. The middle layer is coated with adhesive by using an adhesive coating roller device (6) having a coating roller. The adhesive coating roller device has a spin spraying nozzle in addition to the coating roller. The middle layer is section-wisely sprayed with adhesive along a defined outer circumferential edge area by using the spin spraying nozzle. The adhesive is applied with the coating roller at the middle layer area inwardly subsequent to the circumferential edge area. The middle layer is turned around 180[deg] in the workpiece reception device after coating a first middle layer side. The second middle layer side is coated with adhesive in defined middle layer areas. The already coated middle layer side is subjected with heat by using a heating device after turning in the workpiece reception device in such a way that the first adhesive layer applied on the middle layer is heated at a defined temperature of larger than 80[deg] C. The coating roller is contour-adapted by using a control device and/or a regulating device and/or is processed in any space directions along the middle layer side to be coated in such a way that it has a constant distance to the area of the middle layer to be coated for the case. The areas of the middle layer to be coated is partially differently formed and/or lie at different height levels viewed in cross-section, and have a shape, height and/or width. The middle layer has studs and valleys distanced from each other. A part of the studs is flattened at their peaks and the peaks form a flat adhesive coating surface, at which a flat adhesive bead or an adhesive point is flatly applied in defined middle layer areas by using the coating roller. A dent-like and/or crater-like recess is introduced into the adhesive coating surface formed by the dome-side flattenings. The transferring device receives the middle layer after the two-sided coating of the middle layer and supplies to the pressing device. A heating device, by which the newly applied adhesive layer is subjected with heat during transfer to the pressing device, is arranged to the transferring device in such a way that the adhesive layer subjected with heat is heated at a defined temperature of larger than 80[deg] C. The middle layer both side coated with adhesive is pressed into the pressing device with the cover layers with a defined pressing force of more than 20t for a defined pressing time of 20 seconds. The pressing device is cooled by using a cooling device in such a way that the sandwich board of the middle layer and the cover layers are cooled at room temperature. A carpet layer or similar to be introduced on the sandwich board is provided with a welt-like edge at the outer circumferential side. The coating roller is coated with adhesive in defined lower side areas by the welt-like edge in a flat manner. The coated carpet layer is introduced together with the sandwich board in a laminating tool and the carpet layer is laminated onto the sandwich board. The adhesive layer is introduced at the edge in a defined gap distance by using the coating roller. The area-wise adhesive coating is carried out in connection to the edge and is carried out in the gas distance area by using the spin spraying nozzle. Independent claims are included for: (1) a device for producing a sandwich board; and (2) a core layer or middle layer of a sandwich board having two cover layers.