The sheet, emparticular a protection sheet comprising at least a watermark of multiple tones; the document, method for the manufacture of a play; play and use of at least one piece to form a watermark of multiple tones in a substrate for drainage of a fibrous suspension.That piece comprising a relief on one of its sides, referred to as the 'face shaped and opposite to the face of the drainage', and perforations, said drilling comprising a channel passage with an entry in the face shaped and an exit in the face of drainage.

摘要

The sheet, in particular a protection sheet comprising at least a watermark of multiple tones; the document, method for the manufacture of a play; play and use of at least one piece to form a watermark of multiple tones in a substrate for drainage of a fibrous suspension.That piece comprising a relief on one of its sides, referred to as the "face shaped and opposite to the face of the drainage", and perforations, said drilling comprising a channel passage with an entry in the face shaped and an exit in the face of drainage.The present invention relates to the field of the paper, and relates to a sheet including a watermark of multiple tones of high contrast and high definition having areas of pronounced brightness. The watermark is obtained particularly by means of a piece (4) including a surface (50 having a high area and perforations (6).The perforations (6) are such that making the cut section of the same, at a given distance from the surface of the drainage, depend on directly to that distance. The present invention also relates to the manufacturing method of that piece that is used to form such a watermark to the piece, and the use of that piece, when forming a watermark.