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The adhesion of the paint film can be expressed by the coefficient of friction between the paint film and the unpatterned soft felt moving thereon. BnAM proposes two instruments for determining the coefficient of friction: (1) fixed instrument (test on the coating film coated on the test plate into the mixer), and (2) veneer instrument (test directly on the paintable material On the plane). (Related instruments: Viscometer)
The stationary instrument (Figure 81) has an active plane. This plane rotates along the axis and can be tilted and changed in position to an angle from 0° to 90° from the ground plane. The angle of the active surface is measured by a protractor. The entire instrument can be equipped with three leveling screws to disperse the machine in a strict horizontal position.
When placing the veneer instrument (Fig. 80) on the surface, the hammer and protractor can be doubled to determine the angle of inclination of the surface to the horizontal. The skateboard for measuring the friction coefficient is a flat metal plate with a flattened corner made of chrome-plated or stainless steel "target=_blank> stainless steel. The size of the plate is 30x50xx0.5 mm and the weight is about 55 grams; the plate is Covered by a non-flowered thin felt (e.g., product No. 1039) weighing about 1 gram; the front side of the cloth is facing outward.
Apply the paint material to the glass or metal plate. The nature of the painted surface, the method of finishing and drying, and the number of layers to be applied should be selected according to the technical conditions. (Related instruments: drying time measuring instrument)
The test panel is placed on the movable surface of the fixed actuator at the time specified by the technical conditions, with the unfinished side facing the movable surface, and then the slide is placed on the side with the coating film attached. (Related instruments: adhesion meter)
The minimum angle at which the slide slides off the test panel is measured as the angle of inclination of the active plane on which the test panel is placed is gradually increased. The coefficient of friction between the paint film and the felt covering the slide can be indicated by the tangent of the above angle.
The coefficient of friction of the lacquer plane can be measured by a veneer instrument. To this end, the veneer grinding machine must be placed on the surface. The DIN cup well is measured according to the inclination of the surface and the horizontal plane measured by the hammer while the slide is sliding down.
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