Abstract: An apparatus for the manufacture of blocks of expanded cellular material having an essentially circular cross section from foamable means which comprises a stationary generally U-shaped mold having two sides, a bottom and an open top and forming an elongated channel cavity having a circular cross section, conveyor means fitting into said channel cavity and having a downward inclination, means pouring the foamable mass onto the conveyor means at the upper end thereof, means for moving said conveyor means away from said pouring means, means for heating the conveyor means to the same temperature as the mold, a substantial portion of said conveyor means going through said mold, means for fitting the conveyor means within the mold whereby said foamable mass acquires the circular shape of the inner portion of the mold as it moves away from said pouring means and as it solidifies.

Abstract: The present invention relates to the continuous production of blocks of circular cross section of expanded cellular material. The material is deposited on a flexible liner which is movable sychronously with a flexible mold element through a stationary longitudinal shaping mold which is of circular cross sectional shape at its discharge end. In accordance with the present invention, cellular blocks of completely circular cross section are produced. The invention also provides for the heating of the flexible mold element to reduce the temperature difference between the elements contacting the expanded cellular material so that more uniform density is obtained.