| 摘要 |
PURPOSE:To improve the accuracy in the control of a coating film thickness by determining the friction force acting on the moving guide shoes of a roll stand from a difference in the pressing load at the time of loading and unloading of rolls and correcting the friction force from the actually measured load value, thereby determining the roll pressing force. CONSTITUTION:The pressing force is generated and this pressing force appears in load meters 8, 9 of screw shafts 6, 7 from the point of the time when the pickup roll 1 begins to come into contact with the applicator roll 2 if the pickup roll is pressed to the applicator roll. The pressing quantity between the rolls of this time is regarded zero and while the pressing force is further increased, the modulus of elasticity of the rubber constituting the applicator roll 2 is calculated by the pressing quantity between the rolls and the inclination of the force. The roll pressing force necessary for obtaining the target coating film thickness is determined from the modulus of elasticity, the viscosity of the coating film and the circumferential speeds and circumferential speed ratio of the rolls. On the other hand, the pressing force is increased until the pressing force attains a prescribed value and thereafter, the pressing force is removed and the friction force acting on the guide shoes 10, 11 of the roll stand by the force corresponding to a hysteresis BC is determined. The rolls are pressed again by the pressing force combining the friction force and the target pressing force. |
