| 摘要 |
<p>An apparatus (10) for coating a pattern of spaced discrete patches (12) on a web (14) of material includes an extrusion die (18) and a metering pump (20) which supplies coating fluid to the extrusion die (18) from a fluid reservoir (24). A valve (26) directs fluid to either the extrusion die (18) or the fluid reservoir (24) and a piston provides a pulsed flow of fluid to the extrusion die (18). A controller, including a digital preset counter, controls the length of the coated portions of the web (14), the distance between the coated portions of the web (14), and the timing of the valve (26) with respect to the operation of the piston (28).</p> |
