Method of forming single face corrugated board

A machine for making single face corrugated board without the use of steam by bonding a corrugated sheet material having one or more crests onto a substantially planar sheet, the machine comprising:

• a glue applicator roller having a contoured outer surface in the form of corrugations comprising a series of adjacent grooves completely encircling the surface of the roller which are spaced substantially 1 mm apart from each other and are 0.5 mm deep into which adhesive is deposited, the roller being configured to apply 0.5 mm3 of adhesive in discrete, spaced apart, pear or round shaped droplets, to the crest of the corrugated sheet material, the pear or round shaped droplets being formed as droplets, as a consequence of the adhesive being drawn out of the grooves, and wherein the roller is configured to place the droplets so they are spaced apart by a gap, such that when the droplets become spread and meet one another, the adhesive on the crests reaches a predetermined thickness;
• and
• a pressing mechanism configured to hold the planar sheet against the crest until a bond is formed between them;
• wherein the machine is not configured to use steam and does not comprise a boiler, pipe work or a housing to ensure containment of steam.