Abstract: A method for producing continuous polyurethane blocks having a planar upper surface and a rectangular cross-section is disclosed. The method includes a pressure regulating stage in which pressure is gradually exerted along entire transverse directions of the foamed material to prevent a crowning thereof. The pressure is applied transversely in a plurality of longitudinally discontinuous non-fixed locations.

Abstract: Apparatus for producing continuous polyurethane blocks is disclosed. The apparatus includes pressure regulating members to prevent a crowning of the upper surface of the foamed material. The pressure regulating members comprise a plurality of surface elements each of which is rigid and fixed with respect to an axis taken along the width of the foam. The plurality of elements is arranged or utilized so that the entire width of the foamed material is superposed. The surface elements may be in the form of shoes or rollers. The width of the foamed material may be adjusted by adjusting the apparatus side walls. In such a case, the plurality of surface elements will be arranged or utilized to superpose the entire width without the necessity of shutting down the process or manually adjusting the width of the elements. The shoes or rollers are pivoted or suspended from a common frame so that they are freely movable along the surface of the foamed material in the forward or reverse direction of foam movement.