| 摘要 |
A dryer apparatus (10) is disclosed for drying a pressed web (W). The apparatus (10) includes a plurality of single tier dryer sections (12, 14) in which successive sections (12, 14) dry alternate sides (16, 18) of the web (W), the web (W) being transferred between successive sections (12, 14) without any open draw of the web (W) such that the web (W) is uniformly dried on both sides (16, 18) thereof while the web (W) is restrained against cross-machine directional shrinkage. Each of the sections (12, 14) includes a single tier of dryers (20, 22) with an intermediate roll (28) disposed between each adjacent dryer (25). A dryer felt (30) extends in serpentine configuration around each dryer (24-26) and roll (28) such that the web (W) is disposed between the felt (30) and each dryer (24-26) for drying one side (16) of the web (W). The felt (30) is also disposed between the roll (28) and the web (W) with the felt (30) in direct contact with an alternate side (18) of the web (W). The intermediate roll (28) defines a plurality of circumferential grooves (32-37) for diffusing boundary air (38) following the felt (30) that would otherwise tend to lift the web (W) from the felt (30) extending around the roll (28). The arrangement is such that inherent machine directional shrinkage (MD) of the web (W) during drying thereof inhibits cross-machine directional shrinkage (CD) of the web (W) during movement of the web (W) between successive dryers (12, 14).
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