Smooth press in a machine for manufacturing corrugated cardboard

Abstract

A smooth press comprises a smooth cylinder acting conjointly with a lower ribbed cylinder in order to apply a covering paper against a corrugating paper passing around the ribbed cylinder and includes a tractor arrangement downstream from the lower ribbed cylinder situated with respect to the smooth cylinder so as to form a contact angle of the covering paper against the ribbed cylinder. The tractor arrangement applies a tension force to the cardboard which creates a reactive radial pressure urging the cover paper against the corrugated paper at the contact surface of the ribbed cylinder. A linear support load of the smooth cylinder against the lower ribbed cylinder is regulated at a low value in a range of 0 to 7N/mm by a mounting arrangement for the lower cylinder, which includes a pair of levers subjacent to the ribbed cylinder, the two ends on the same side of the pair of levers being rotationally mounted on an axle fixed to the frame and the two other ends being held by an actuator at a constant pressure across a first detector, with the upper edge of each lever resting against an adjustable stop having a motorized cam across a second force detector.