| 摘要 |
A method and apparatus are useful to produce a corrugated product. They can be used to produce a corrugated product at low temperature, such as room temperature. A zero-contact roll is used to support a web of medium material on a cushion of air at a location prior to the web entering the corrugating labyrinth. The web is free to move toward or away from the surface of the zero-contact roll, on the cushion of air, in response to small oscillatory changes in downstream tension demand based on the fluting frequency in the corrugating labyrinth. A mechanism is also provided to precisely control the mean tension in the web prior to entering the corrugating labyrinth at a low value. Thus, mean web tension is precisely controlled and is low, tension oscillations can be damped, and low temperature corrugating can be achieved without significant fracturing in the corrugated web. A single-facer useful to apply a high-solids content adhesive, also desirable for low-temperature corrugating, is also provided. |
