| 摘要 |
<p>Curtain coater method and apparatus is disclosed for coating objects wherein the coater head is maintained substantially full of coating material, the material is discharged through an elongated adjustable orifice at a rate to form a stable or unbroken curtain, and an object is conveyed through the curtain at a velocity to deposit a layer of the material of pre-determined thickness onto the object. The head is provided with a longitudinally split, resilient, metallic, tubular member, with orifice knives carried thereby along the split, one knife being movable by hydraulic actuators with respect to the other knife to define the elongated adjustable orifice. A crank and rack arrangement, carried by the head, is used to adjust the stroke of the hydraulic actuators, and thereby to regulate the orifice width. The tubular member is provided with an elongated filler tube that has a trough in its upper quadrant to distribute the material evenly throughout the entire length of the tubular member, thus reducing turbulence near the entry. The filler tube and the tubular member form passages therebetween, which provide for an increased speed of the material as it approaches the orifice, thereby reducing precipitation of solids. The ends of the tubular member are sealed by end assemblies that accommodate to the changing shape of the tubular member. Windscreens surround the head to protect the curtain. Hydraulic cylinder apparatus is provided which can raise, lower, and level the head longitudinally, and laterally. A narrow receptacle, which minimizes the amount of material used in the coater, and aids in the conveying of small objects, is provided on the conveyor. An hydraulic drive system is utilized to control the curtain coater.</p> |
