A method of transferring objects onto a substrate, or a moving substrate, the objects to be transferred being placed in a transfer area including an inlet and an outlet spaced apart from one another by two lateral edges opposite one another, and holding a carrier liquid forming a conveyor, the objects being held by a compact film of particles floating on the carrier liquid of the transfer area, in which the objects are moved with the particle film to be transferred onto the substrate when they reach the outlet.

An apparatus for use in producing a corrugated board product includes a flotation column for emitting pressurized air to support a traveling corrugated board product on a cushion of air void of contact with other surfaces at a point of warp detection. A warp detection apparatus is used in combination with the flotation column to analyze the supported traveling corrugated board product to permit adjustment of variables in a corrugated manufacturing system for corrected detected warp in the product.