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Abstract

An apparatus and a method for hot-forming a laminated sheet of synthetic resin. The sheet, in at least its region that is to be deformed, is heated to the forming temperature which is equal to or higher than the melting temperature of a thermoplastic bonding agent which is disposed between the laminate layers containing a duromer plastic material and planar carrier materials. The sheet is bent around a cylindrical surface with the aid of a movably guided bending plate, and is cooled. During a large part of the bending operation, the bending plate will be in planar contact with the border region of the sheet. The individual laminate layers will be mutually displaced in the bending region and in the border region in the direction of the sheet's surface, and after the bending operation, the bending plate holds the border region in its bent position at least until the resolidification of the thermoplastic bonding agent. In a last phase of the bending operation, the bending plate (12) is constantly guided in such a manner that each point of its bending surface (16) has an essential component of motion in a direction parallel to the plane of the bent border region (31'). A prebending element is provided connected with the bending plate (12), and during a first phase of the bending operation, the prebending element presses against the border region (31) of the sheet to be bent and thereby prebends it.

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