Method and apparatus for increased splicing speed on a corrugator web splicer
View Patent ↗Clutch pressure or servo motor torque profiling is applied to the powered capstan roll in a corrugator web splicer to control tension in the paper in the accelerating new paper roll to bring the new roll up to line speed more quickly and without causing web tear out.
1. A method for bringing a new roll of paper web material from zero to corrugator operating speed in a corrugator splicer after effecting a zero speed splice, wherein the splicer includes a dancer roll system located at the downstream output end of the splicer and a motor-driven capstan roll assembly comprising a capstan roll driven by a motor located between a splice sealing apparatus of the splicer and the dancer roll assembly, the capstan roll assembly adapted to apply supplemental tension in the web between the capstan roll assembly and the newly spliced in paper web material, causing the paper roll to accelerate until the paper web unwinding from the spliced-in paper roll achieves corrugator operating speed, the method comprising the steps of:
applying a driving torque to the capstan roll assembly with driving torque to start at an initial level of torque near zero and to increase over a short time period in the range of about 2 to 3 seconds up to a maximum driving torque level achieved when the capstan roll slips beneath the paper web; and
achieving an increasing tension in the paper web between the capstan roll and the newly spliced-in paper roll during the short time period that reduces jerk on the paper web and prevents web tear out while accelerating the paper roll until the paper web unwinding from the roll reaches corrugator speed.
2. The method as set forth in claim 1 including the step of discontinuing driving the capstan roll assembly when the paper roll is at corrugator operating speed.
3. The method as set forth in claim 1 including the step of providing a variable pressure pneumatic clutch and operating the variable pressure pneumatic clutch to achieve the increasing tension in the paper web.
4. The method as set forth in claim 3 including utilizing an induction motor to drive the capstan roll.
5. The method as set forth in claim 1 including utilizing a servomotor to drive the capstan roll.
6. The method as set forth in claim 1 wherein the capstan roll assembly comprises a first capstan roll and a second capstan roll located downstream of the first capstan roll, and including the steps of:
driving the first capstan roll to provide an initial level of supplemental tension; and
simultaneously driving the second capstan roll to increase tension in the paper web material; and
thereby causing a greater tension in the paper web between the capstan roll assembly and the newly spliced-in paper web roll to allow the new paper web roll to be more quickly accelerated to corrugator speed before the paper stored in the downstream dancer roll arrangement is exhausted.