| 摘要 |
<p>A method for applying droplets of a viscous material onto the surface of a moving object according to a specified bitmap pattern is described. First of all, said bitmap pattern is converted into a dot location map, which shows each location on the object where a droplet of viscous material should be applied. Then the dot location map is converted into a mass per dot map, which represents a quantity of viscous material which should be applied to the moving object on each location. The mass per dot map represents the calculated best approximation of the original bitmap. From the mass per dot map points in time when each nozzle has to eject a droplet of viscous material are calculated, as well as the quantity of viscous material to be ejected at each point in time. Each nozzle head is then driven according to the calculated information about time and quantity. Preferably, valves are all driven at the same frequency, but with a different pulse width modulation.</p> |
