| 摘要 |
<p>An adhesive laying machine has a nozzle 10 through which a bead 12 of adhesive is extruded onto a surface 14. The viscosity of the adhesive can vary, and in order to ensure that a bead of uniform dimensions is laid, a viscosity-dependent parameter is sensed and the result is fed back to the machine operation which is then altered to bring the parameter back to a predetermined value. Either the speed of the nozzle is altered, keeping the pumping pressure through the nozzle constant, or vice versa. The viscosity-dependent parameter may be height of the bead, or its length in front of the nozzle, or the flow rate of adhesive through the nozzle. <IMAGE></p> |
