22 in the alternative any number of foam application stations can be employed for either the top or bottom or both of the porous substrate as shown in fig2 the nip region 21 is defined by the positioning of the second foraminous drum adjacent the top foam discharge head the foraminous drums can be driven by any suitable means such as motors 23 the fully impregnated pack can then be passed through a dryer such as radio frequency dryer 24 which can remove water from the impregnated pack without curing the binder subsequently either in an on line operation or in an off line operation the impregnated dried insulation pack can be passed through a curing station such as curing oven 26 to produce cured insulation product 28 alternatively the dried uncured insulation material can be molded using conventional wool molding techniques for such uses as automobile hoodliners and headliners the foam discharge head is adapted with surface plate 32 across which the insulation pack is transported preferably the surface plate and other parts of the foam discharge heads are comprised of stainless steel or some other wear resistant corrosion resistant material the surface plate is adapted with a plurality of discharge openings 34 for dispensing foam from the foam discharge head into the insulation pack the discharge openings can comprise a single slot not shown preferably the discharge openings comprise a.