Patent ID: 8372240
Filing Date: 2013-02-12
Classification: B28B,E04C,Y10T

Abstract:
1. A production line for producing hydraulic-binder-based boards from a preform comprising a facing material covered with a hydraulic binder composition and supported by a conveyor belt, comprising at least two forming tapes fitted with longitudinal tapes, the line further including a device that produces an impression in the preform before the first forming tape, the impression being produced in an upper part of the preform, wherein the device for forming the impression in a hydraulic-binder-based preform comprises at least: a frame; two first pulleys supported at a first end of the frame and two second pulleys at a second end of the frame; the first pulleys and the second pulleys being in parallel planes; the pulleys facing each other being identical; two transmission belts wrapped respectively around the first pulleys and the second pulleys; and at least one wire fixed removably to the belts and extending between the belts so that its longitudinal axis is parallel to the axis of rotation of the pulleys; the distance between the transmission belts of the device being at least equal to the width of the preform and the device being placed so that when its transmission belts turn, its wire(s) creates(create) an impression in the preform.