Corrugating linerboard, corrugated board, and methods of making the same

[0036]In this example, samples of standard uncoated USP120 linerboard were compared to samples of similar linerboard double coated with a moisture resistant coating and samples of the same linerboard having one side double coated with a moisture resistant coating and the other side of that linerboard impregnated with wax. The samples were subjected to a standard ring crush test according to TAPPI standard T 822, both in a dry environment and at high humidity, i.e. at 90% relative humidity and 45 degrees Fahrenheit for at least about 24 hours. As shown below, the coated linerboard shows an improvement in strength over uncoated linerboard both in the dry environment and at high humidity.

CoatingTopWaxTAPPI45 / 90BCoatImpregnationRingRing# / MSF# / MSF# / MSFCrushCrushUSP12000011859USP120 + Double2.11.5013468CoatingUSP120 + Double2.11.521175113Coating + WaxCoating B (base coat): 50 / 50 Barrisurf ® HX and Tykote ® 1004Top Coat: 100% Tykote ® 1004Wax: Standard paraffin impregnating wax from ExxonM...