once leaving the papermaking machine may be compressed or reduced in caliper by up to 50 and more preferably from 15 to 25 this same result can be achieved by lowering the basis weight of the paperboard the paperboard of the present application can be utilized to make a variety of structures particularly containers in which it is desired to have insulating characteristics one of the most common of these containers is the ubiquitous hot cup utilized for hot beverages such as coffee tea and the like other insulating containers such as the ordinary paper plate can also incorporate the paperboard of the present invention also carry out containers conventionally produced of paperboard or of foam material can also employ the paperboard of the present invention fig6 shows a wall section of a hot cup type container produced which may comprise one or more plies 62 and 64 one of which in this instance 64 contains crosslinked cellulosic fibers in this embodiment the crosslinked cellulosic fibers are in the interior ply 64 a liquid impervious backing is preferably extruded or poly coated to the interior ply coated to the the backing may comprise for example a variety of thermoplastic materials such as polyethylene it is preferred that the paperboard used in the bottom of the cup contain no bulky fibers high consistency slurries were prepared at a 3 2 percent consistency containing 50 to 65 percent by weight citric acid crosslinked cellulosic fibers the crosslinked fiber was deflaked with a standard beloit jones refiner with a zero load douglas fir cellulosic fibers were used as the.