Process for the production of piping made of a cementitious material having a circular section
AssigneeItalcementi S.p.A.
InventorsGian Luca Guerrini, Roberta Alfani
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Abstract
The present invention relates to a process for the production by extrusion of piping made of a cementitious material having a circular section and fine thickness, suitable for the channeling of liquids and gases at atmospheric operating pressure or slightly higher.
Claims14
A process for the production of piping made of cementitious material having a circular section and a low thickness by the extrusion of a cement-based paste to form neo-extruded piping, characterized in that it comprises a rolling phase of wherein the neo-extruded piping is rolled inside a tubular counter-mold transmitting centrifugal force to said neo-extruded piping which preserves the circular form of said neo-extruded piping until a hardening degree of the cementitious material is obtained, said rolling phase of said neo-extruded piping comprising rotating said neo-extruded piping in alternating directions.
A process for the production of piping made of cementitious material having a circular section and a low thickness by the extrusion of a cement-based paste to form neo-extruded piping, characterized in that it comprises a rolling phase wherein the neo-extruded piping is rolled inside a tubular counter-mold transmitting centrifugal forces to the neo-extruded pipe which preserves the circular form of the neo-extruded piping until a hardening degree of the cementitious material is obtained wherein the neo-extruded piping and tubular counter-mould are kept in alternating rotation at a rate ranging from 0.2 rpm to 10 rpm.
A process for the production of an end-product made of cementitious material having a circular section and low thickness comprising:
- a mixing phase of a cement-based mixture with water to give a wet cement-based powder;
- a homogenization phase of said wet cement-based powder in a pasting machine to produce a cement-based paste suitable for extrusion;
- an extrusion phase of said cement-based paste in an extruder to give a cement-based end-product having a substantially circular section;
- a flowing phase of said cementitous end-product having a substantially circular section inside a tubular counter-mold positioned close to the die of the extruder to form a combination of an end-product-tubular-counter-mold;
- a cutting phase of said end-product-tubular-counter-mold system;
- a rolling phase of the end-product-tubular-counter-mold system transmitting a centrifugal force to the end product where said rolling phase of said end-product-tubular-counter-mold comprises rotating said end product inside of the tubular counter-mold in alternating directions which allows the circular form of the product to be preserved until a hardening degree of the cementitious material is reached.
Dependencies are inferred from the claim text.