Rigid-when-wet paperboard containers and their manufacture
AssigneeAlton Box Board Company
InventorsRobert M. Wilkinson, James R. Lyon
Life of this patent
Estimating the term…
Abstract
Rigid-when-wet, but foldable, corrugated paperboard and process of making same by applying phenolic resin to contiguous surfaces of the outer liner, the medium, and the inner liner without substantially altering the hygroscopicity of the exposed faces of the liners, and adhering the three components together before the resin is cured.
Claims5
In the art of manufacturing rigid-when-wet corrugated-board from a preformed web of medium and at least one performed web of liner, each of which has an obverse face and reverse face, the process comprising, surface-treating the reverse face of the liner web by printing thereon a controlled amount of a mixture composed with a curable thermosetting resinous material entrained in a vaporizable liquid vehicle without effecting the moisture absorbency of said obverse face, the thermosetting resinous material comprising about 35 to 65 percent by weight of the mixture when entrained in the vaporizable liquid vehicle, and immediately vaporizing at least a substantial part of the vehicle from the web by heating at a temperature and for a time less than that required to substantially advance the cure of the resinous material therein.
Dependencies are inferred from the claim text.