Glue applicator for corrugated board

摘要

A presser shoe is disposed over the entire width of a single-faced corrugated board opposedly to a glue applicator roll with a traveling path of the single-faced corrugated board therebetween, and a flexible tube is provided which presses the presser shoe toward the single-faced corrugated board by air pressure. The air pressure to be fed to the flexible tube is regulated to a predetermined pressure by an air pressure regulator so as to afford a constant pressing force continually even in the use of single-faced corrugated boards of different flutes. The pressing shoe is formed with a longitudinally extending channel as an air flowing path at least on both longitudinal end sides thereof located outside the single-faced corrugated board, and air nozzles are formed in the presser shoe perpendicularly to the surface of the glue applicator roll over an area capable of being opposed to the single-faced corrugated board, whereby an air jet deviated from the board does not strike against the surface of the glue applicator roll directly.