Abstract: Ink jet apparatus with two piezoelectric actuators arranged back-to-back on parallel thermal management surfaces of a water-cooled chassis. The chassis is formed by the bringing together of two concave plastic molded parts, having high thermal conductivity. A common nozzle plate attached to the two actuators helps to ensure accurate nozzle alignment.

Abstract: A method of immersing a flexible web of material in a fluid, the method comprising delivering the web to the fluid and subsequently withdrawing the web from the fluid, wherein the web passes through the fluid not under tension. Thus, the web is not constrained by any tensioning means to follow a particular path through the fluid. The web may instead by constrained by one or more walls confining the fluid, typically walls of a fluid container. In this case the path taken by the web through the fluid and the speed of delivery to and withdrawal from the fluid. The invention also covers corresponding apparatus.