Apparatus for applying glue to the flute tips of a single-faced corrugated paperboard sheet

摘要

A contact bar for slidably contacting the liner of a single-faced corrugated paperboard sheet to press the flute tips of the sheet against a rotating glue roll without crushing the flute tips. The contact bar includes an elongate frame mounted opposite and in spaced-apart relation from the rotating glue roll. A series of shoes are pivotally connected to the frame and depend therefrom defining a predetermined clearance from the outer surface of the rotating glue roll. The shoes are biased by springs to cause the shoes to slidably contact the liner and press the flute tips against the rotating glue roll. The shoes may be formed of cold-rolled steel providing a reasonably long expected service life and also having an abrasion resistance so that conformance of the shoe contact surfaces with the rotating glue roll and a single-faced sheet occurs in a relatively short time caused by abrasion with the slidably contacting single-faced sheet.