| 摘要 |
A web (44) passes over an air bar (40) or metering drum, defines a loop (48, 50, 52) within an open space (46) defined between two pneumatic tensioning wall members (14, 16), and passes over an air bar (42) or metering drum. Pressurized air issues through apertures (36) arranged in rows along web control surfaces (32, 34) to establish curtains of air flowing between the surfaces and the web, thereby applying tension to the web due to the Bernoulli and viscous drag effects.
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