| 摘要 |
An exhaust duct (110) is provided for, among other things, use in coating devices of the type which provide coatings on one or opposite surfaces of the substrate. The exhaust duct facilitates removal of excess coating substances from a coating device while keeping the coating substance associated with one surface of the substrate away from the coating substance which is associated with an opposite surface of the substrate. The exhaust duct (110) also facilitates withdrawal of a coating substance from a dispersion of the coating substance in a substantially uniform manner. The exhaust duct (110) comprises an elongated triangular body which is hollow to define a cavity (114) in the elongated body (112), an entrance (116) into the cavity (114) for the coating substance, and an exit port (118) in the elongated body (112). The entrance (116) extends longitudinally along the elongated body (112). The cavity (114) of the elongated body (112) has a cross-sectional area which progressively decreases toward longitudinal ends of the elongated body so that, when pressure at the exit port is less than atmospheric pressure, the entrance exhibits a pressure reduction relative to atmospheric pressure which is substantially uniform along a length of the entrance. This, in turn, facilitates withdrawal of the coating substance into the cavity through the entrance in a substantially uniform manner. |
