| 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 ze ro- contact roll, on the cushion of air, in response to small oscillatory change s in downstream tension demand based on the fluting frequency in the corrugati ng labyrinth. A mechanism is also provided to precisely control the mean tensio n 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 ca n be damped, and low temperature corrugating can be achieved without significa nt fracturing in the corrugated web. A single-face useful to apply a high-solid s content adhesive, also desirable for low-temperature corrugating, is also provided. |
