Importance

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Abstract

In a single facer including an upper corrugating roll, a lower corrugating roll and a pressure roll, the lower corrugating roll is provided with a plurality of spaced circumferential grooves on the outer peripheral surface extending at right angles to the flutes of the corrugating roll. A plurality of circumferentially spaced bores are drilled in the roll extending in an axial direction and communicating with the bottoms of the aforementioned circumferential grooves. Suction means is disposed at one end surface of the roll for communicating with the bores. The suction means is selectively placed in communication with only those bores which at the time are in an angular position where a corrugated web is to be held in contact with the roll. In one preferred embodiment pressurized gas is placed in communication with selected bores to provide gas therethrough during the period when these selected bores are in an angular position where the corrugated web is to be released from the roll. The roll is formed to provide a hollow central portion and hot fluid is supplied to this central portion. In another preferred embodiment slotted pipes are placed in the bores with the slots in communication with the circumferential grooves.

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First Claim