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Formulation, Application, Use, Properties

Fillers and Putties for Wood Materials. Fillers are highly extended (resin/extender ratio, 1 2.5) compounds of high viscosity which are applied to cover any unevenness in a substrate such as chipboard. Putties contain less extender (1 1.5) and are normally used as an intermediate coat between the filler and the top coat. Fillers and putties are formulated using dissolvers, butterfly mixers or attrition mills. [Pg.60]

Whereas fillers are applied using a roller machine, putties are usually applied by reverse roller, spray gun or curtain coater. Depending on the substrate, the application rate is between 50 and 200 g/m. Fillers are mainly formulated with paraffin-type UP resins or air-drying types which are UV-cured. For fillers cured with hy-droperoxide/cobalt, air-drying UP resins are normally used in combination with flexibilising resins. [Pg.60]

UV curing is carried out at a conveyor speed of approximately 3 m/min. The conveyor speed is usually calculated on the basis of a high-pressure mercury vapour lamp with an output of 80 W/cm. Conventional curing of spray fillers in a circulating air oven takes 10 min at 80 °C. These systems provide virtually ideal substrates for a number of top coats as, unlike other systems, they have good hold-out. [Pg.60]

Roller, Curtain and Spray Coatings for Laminated Panels and Films (Thin-coat). [Pg.60]

Laminated panels which are to be given an open-pored coating are first primed and sanded. [Pg.60]


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