| 摘要 |
An adjustable gas knife comprising an elongate nozzle (14) for projecting a sheet of gas through an elongate jet opening (14a), gas flow modification means (22) located within said nozzle (14) for modifying the rate of flow of said gas and differential adjusting means (24,24a) for selectively adjusting the position of the gas flow modification means at a plurality of positions along the length of said gas flow modification means (22) to modify the rate of gas flow at a number of positions along the length of the nozzle (14). |
