| 摘要 |
In a screen drum device with a fan mounted endwise for generating suction through the screen drum surface, in front of a screen drum jacket, a baffle cover is usually provided. This baffle cover generates in a baffle chamber in front of the baffle cover, the accumulated pressure which is required for uniform processing of a web of material. In order to be able to handle optimally webs of different widths on the screen drum, the baffle cover in the vicinity of the narrow width of the goods is made so that it can be either removed completely or is given an opening mechanism, or the baffle cover has an additional screen cover located parallel thereto and displaceable with respect to the baffle cover. The holes in the baffle cover and screen cover are so arranged with respect to one another that when displacement by about one hole division takes place, most of the holes in the baffle cover can be covered by the ribs or non-permeable portions adjacent to the holes of the screen cover in order to be able to dry the material in the remaining part.
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