Abstract: An apparatus suitable for the continuous preparation of a polymer-based cellular foam sheet of a predetermined thickness wherein the foam is produced from a reaction product capable of curing at ambient temperature formed by the reaction of a reactant composition including a prepolymer and water, the apparatus including: a means for reacting the reactant composition, a continuously moving substrate for receiving a quantity of the reaction product; a means for depositing the quantity of reaction product onto the substrate to form a rising foam sheet; a means for compressing the rising foam sheet to a predetermined degree, the compressing means being spaced from the depositing means; and a curing means spaced from the compressing means and providing for a rising of the foam sheet exiting from the compressing means to provide a porous foam sheet having the predetermined thickness.

Abstract: A continuous process for the preparation of a polymer-based foam sheet at ambient temperatures wherein the foam is produced from a reaction product capable of curing at ambient temperatures formed by the reaction of a reactant composition comprising a prepolymer, such as an isocyanate-capped polyether, and water, comprising:(a) providing a continuous substrate;(b) depositing said reaction product onto said substrate;(c) compressing said reaction subjecting said product to at least one compression of a predetermined degree after said reaction product has creamed but prior to the time said reaction product has finally cured; and(d) finally curing said reaction product.