| 摘要 |
<p>An extended nip press (10) with an improved press shoe (22) and pressure applying apparatus. The press (10) includes a backing roll (14), a shoe (22), a belt (58), one or more felts (54) for passing between the shoe (22) and the backing roll (14) with the web (W), and a pressure applying apparatus for selectively forcing the shoe (22) toward the backing roll (14), such that the belt (58), the one or more felts (54) and the web (W) are urged against the backing roll (14) to establish a pressure zone (P) between the shoe (22) and the backing roll (14). The pressure applying apparatus is operable to vary the pressure profile of the pressure zone (P). The pressure applying apparatus engages the shoe (22) at three or more points on the shoe (22), spaced in the machine direction. The pressure applying apparatus includes three hydraulic pressure applying devices (34a, 34b and 34c) which are independently operable to vary the pressure profile. The press shoe (22) has a stiffness value in the range of approximately five million to fifty million mm4/meter width, and the pressure profile can be varied by flexing the press shoe (22).</p> |
