Processing and working instructions HPL and HPL elements PR ...

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PRODUCT INFORMATION 7. WOrKINg WITH DUrOPAL HPL AND DUrOPAL HPL ELEMENTS 7.1 general DUROPAL HPL with a thickness of less than 2 mm needs a flat, stress-free core material with minimum flex. A smooth surface is an essential requirement for a permanently good result. The right adhesives, application quantity, pressure and press temperature are equally important. Since DUROPAL HPL may be subject to slight dimensional changes, depending on the air humidity and temperature, these properties must always be taken into account when working with DUROPAL HPL. 7.2 Core material The following table describes the suitability of different materials as cores and their application possibilities. With all such information, it should be noted that the properties of a core materials of different composition (e.g. honeycomb with frame) can have an effect on the surface texture of the DUROPAL HPL. This should be checked in advance and taken into account. Material/properties and suitability as core material Chipboard panels On free supporting constructions, the necessary thickness must be taken into account. The fixing of the flat bonded element depends on the thickness and size of the panel. The surface quality of the DUROPAL HPL element depends largely on the structure of the chipboard panel construction, i.e. the shape of the chips, resin content, density, and in particular on the sanding quality of the surface. Multi-ply chipboard panels are suitable as core materials. The panels should be evenly sanded on both sides in order to prevent bowing and visual surface defects. In order to enable a short bonding and pressing time, ensure good surface absorption properties if you are using water-based bonding system. The surface must also have a resistance to delamination strength of at least 1.2 N/mm2 to avoid detachment of the laminate (DIN 52 366). Please contact us in the event of any further questions on these special chipboard panels. 099 PI Processing and working instructions Page 14 of 34
PRODUCT INFORMATION MDF panels Particularly suitable for profiling, although not self-supporting in low thicknesses. Hard fibre panels Plywood panels Veneered panels Not self-supporting. Surface textures containing paraffin must be sanded before bonding, but are usually supplied already treated. Density 850 kg/m3, other properties according to EN 622. Self-supporting. In order to ensure a smooth surface preferably use laminboard with narrow strips and a softwood covering layer. Thin panels are not self-supporting, the fixing method depends on the thickness and size. Softwoods such as poplar and abachi are suitable for bonding. Solid timber Should only be used for small areas. Risk of deformation! Honeycomb structure Foam materials 7.3 Preliminary treatment Suitable as a component of composite core materials or in combination with a framework construction. Self-supporting for vertical surfaces, also suitable as a component of composite panels. Excellent heat insulation. Hard foams on a synthetic resin basis, such as polystyrene, PVC, phenol, polyurethane, are suitable for bonding. Please consult the manufacturer in all cases before bonding. The DUROPAL HPL and the core materials must always be conditioned together, in order to equalise the moisture content of the components. Materials with too high a moisture content tend to contract after a period of drying. This can result in cracks and distortion. Materials which are too dry are difficult to work and can later expand, once again leading to distortion. The correct conditioning is achieved at a room temperature of approx. 18–25 °C and 50–65 % relative humidity. The following points must also be observed: • adequate air circulation around the DUROPAL HPL for at least 10 days. • alternatively the core panels and laminates can be stored for at least three days, stacked in the same order as they will later be bonded together. In this case, the air humidity should be similar to that in which the panels will later be used. 099 PI Processing and working instructions Page 15 of 34
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