| 摘要 |
The present invention reduces damages in a single-facer expected when foreign matters are bitten between a downstream side corrugating roll and an upstream side corrugating roll, achieves effective utilization of a peripheral space, and also improves a bonding strength between a core paper web and a corrugated paper web by maintaining a temperature of a single-faced cardboard sheet constant. A downstream side corrugating roll (1) and an upstream side corrugating roll (2) are formed in such manner that a pitch circle diameter (D1) of the downstream side corrugating roll (1) may be larger than a pitch circle diameter (D2) of the upstream side corrugating roll (2) and the ratio of the diameter (D1) of the downstream side corrugating roll (1) to the diameter (D2) of the upstream side corrugating roll (2) may be a predetermined integer ratio. Even in the event that a foreign matter such as a bolt has been bitten between the respective corrugating rolls, damages occurring on the both corrugating rolls are limited to a number of locations, and so, great reduction of a repair time can be realized. Furthermore, owing to the fact that the diameter of the upstream side corrugating roll can be made small, a sufficient room can be produced in the peripheral space. In addition, at least either one of a pressing force and a wrapping angle ( theta ) of an endless belt is regulated by detecting a surface temperature of a single-faced cardboard sheet (6) with a temperature sensor (13) and controlling a cylinder via a temperature regulator (14) and an electro-pneumatic converter (15) in response to the detection signal, and thereby the surface temperature of the single-faced cardboard sheet (6) can be maintained constant. |
