together the layers of the composite article the mdi saturated foam 22 exits the binder bath 42 and is compressed between a set of calender rolls 44 which are used to control the amount of mdi retained in the foam core 22 the amount of mdi saturation is commonly referred to as the saturant level by controlling the saturant level amount it is possible to vary the rigidity of the article 20 produced since the degree of rigidity soft u2190 u2192 hard of the composite article 20 is a function of both the type and the amount of saturant present i e mdi varying the type or the amount of saturant directly effects the rigidity of the composite article 20 that is by controlling the amount of saturant in the foam 22 by either squeezing the saturant out of the foam 22 using the calender rolls 44 or by diluting or thinning the concentration of saturant in a suitable solvent such as 1 1 1 tricloroethane propylene carbonate or methylene chloride a composite article 20 can be produced having any desired degree of resilience or yieldability therefore a composite article 20 can be produced wherein the foam core 22 provides structural rigidity ranging from very soft little or no structural support very resilient to very rigid good structural support not resilient the saturant range can be from 300 1500 g mdi for 20 mm of foam the foam core 22 with the desired.