Process for the manufacuture of stratified pieces such as roof tiles and wall tiles

Claim 1

Process for the manufacture of stratified pieces such as tiles by successive and independent extrusions of cement mortars, comprising the steps of: (a) molding a first mortar layer by extrusion of mortar onto a plurality of consecutive contacting molds to produce a shaped layer having a width which is narrower than that of said molds, said width being limited by side limiters thereby leaving the molds uncovered along bands at each side of said first mortar layer; (b) dislodging said mortar from cross strips at each area of contact between two consecutive molds to provide a separate molding by mortar on each mold; (c) molding by extrusion a second mortar layer over said separate moldings, without causing deterioration or alteration of said separate moldings, said second layer covering said molds at said bands and said cross strips to produce a layered product having a desired final thickness of said stratified pieces; and (d) cutting said layered product coincident with said area of contact of said molds to provide said stratified pieces with said first molding covered by said second layer on each side of said first molding not in contact with said mold thereby obtaining homogeneous facing surfaces of said second layer on said stratified pieces.