Abstract: A smooth press implements the application of a covering paper against a corrugated paper passing around a ribbed cylinder or roll of a single corrugator. The smooth press comprises a series of identical support arrangements arranged side-by-side along the ribbed cylinder or roll. Each arrangement has a pad whose support surface is urged against the ribbed cylinder and is curved according to a radius approximately equal to that of the ribbed cylinder in order to cover a plurality of ribs. Each pad is movable between a position disengaged from the corrugated paper and a second position biasing the cover sheet onto the corrugated paper on said ribbed cylinder and is movable individually in a controlled fashion.

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.

Abstract: A device to limit the glue width on a glue applying roll of a gluing station for applying glue on a sheet of material characterized by the glue applying roll dipping into a container of glue, a doctor blade engaging a surface of the glue applying roll to remove glue, said doctor blade being mounted by an arrangement which moves the blade laterally along the axis of the roll in response to the detected position of the web so that as the web shifts laterally, the edges of the glue film are simultaneously shifted. Preferably, the apparatus includes a second blade which is larger than each doctor blade which has an edge positioned spaced from the surface of the glue applying roll to reduce the size of the film in the area of the doctor blade.

Abstract: A vertical rear door for a single-face station which has a pressurized volume and which station is used to produce corrugated cardboard. The door consists of a panel with an outer dimension slightly smaller than the inner dimensions of the door frame in which it is received. The whole periphery of the panel of the door is provided with peripheral seals resting on the inner periphery of the framework. An interlocking arrangement includes at least a hook mounted to extend in a vertical plane from the inner surface of the panel of the door and liftable so that it can move in a vertical plane by means of a lifting arrangement. The hook engages an interlocking axle which is mounted permanently on the door frame and the front part of the inner notch of the hook has a forward curvature to surround a substantial portion of the axle when the hook is engaged thereon.

Abstract: A device for adjusting the distance between a web leading roll, such as a corrugating roll, and a glue applying roll in a glue unit comprises a shaft arranged to extend across the frame of the machine parallel to the glue applying roll with the gluing unit for the glue applying roll engaging the shaft, an arrangement for lifting the gluing unit to rotate around the shaft so that the glue applying roll will be positioned closer to the web leading roll and the device includes at least one cam mounted in the frame to engage a stop on the subframe of the glue unit to limit the amount of movement in elevation of the gluing unit.

Abstract: A single-face station for a machine that produces corrugated cardboard comprises a frame which includes a stand with two lateral wall members, a lower cassette which carries a lower pressure roll being positioned on support and resting surfaces formed in the lateral walls, an upper cassette having a pair of corrugating rolls resting on the lower cassette and on guide surfaces in each of the side walls. The resting surface and support surface extend at right angles to each other and obliquely to a horizontal plane and the arrangement includes a holding arrangement to exert a downward force on anchoring points provided in a lower rear portion of the upper cassette in order to hold the upper cassette and lower cassette on their respective resting, supporting and guiding surfaces. In addition, there is an extracting arrangement for allowing the upper cassette to be withdrawn laterally from the frame.