Production process for hydraulic binder-based boards with four tapered edges, production line of such boards
AssigneeLafarge Platres
InventorsJean-Louis Laurent, José Madeira, Stéphane Mettavant, Dominique Ribas
Life of this patent
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Abstract
A production process is provided for a board of hydraulic binder with a facing on each of its sides. The process includes on one side first tapered parallel edges and on the same side or the other side, two second tapered parallel edges perpendicular to the first. The process also includes the use of a forming lath having at least two distal parts. The process can be used in a production line that includes a specific lath.
Claims25
A production process for a board of hydraulic binder, the process comprising:
- 1) pouring a hydraulic binder slurry on a first facing material supported by a conveyor belt and at least two longitudinal forming strips, and covering the hydraulic binder slurry with a second facing material so as to obtain a preform;
- 2) producing an imprint in an upper part or a lower part of the preform using at least one lath having at least two distal parts and comprising a plurality of bars embedded in a polymer matrix at the level of the distal parts;
- the lath being withdrawn before hydraulic setting begins;
- 3) allowing for hydraulic setting of the hydraulic binder slurry to take place;
- and
- 4) cutting the preform at a level of a tapered section created by the imprint into the board of hydraulic binder with the facing materials on each of its sides, the board comprising on one side two first tapered parallel edges and on the one side or another side two second tapered parallel edges perpendicular to the first.
A production line for hydraulic binder-based boards from a preform, the preform comprising a facing material covered with a hydraulic binder slurry and supported by a conveyor belt comprising a longitudinal forming strip, the preform further including a second facing material on an upper part thereof;
- the production line further comprising a device forming an imprint on the preform before the imprint encounters the forming strip, the imprint being made on the upper part of the preform, wherein the imprint-forming device comprises:
- a frame;
- two first pulleys supported at a first end of the frame and two second pulleys supported at a second end of the frame opposing the first end of the frame;
- the first pulleys and second pulleys being in parallel planes;
- the pulleys opposite one another being identical;
- two drive belts encircling respectively the first pulleys and the second pulleys;
- and
- at least one lath attached in a removable manner to the belts and extended between the belts in such a way that a longitudinal axis of the at least one lath is parallel to a rotation axis of the pulleys,
- the lath having at least two distal parts;
- and
- a distance between the drive belts of the imprint-forming device being at least equal to a width of the preform, and the imprint-forming device being arranged in a manner so that when the drive belts turn, the lath creates an imprint in the preform.
Dependencies are inferred from the claim text.