Process for manufacturing a sheet material
A paper and paper layer technology, applied in papermaking, paper, paper machines, etc., can solve the problems of difficult paper handling, thickness difference, material loss, etc., and achieve the effects of enhancing durability, reducing risks, and strengthening adhesion
Inactive Publication Date: 2010-06-16
ARJO WIGGINS SECURITY SAS
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Problems solved by technology
[0007] However, the paper thus obtained has the disadvantage of having a difference in thickness on the face of the paper, in particular an excess of thickness at the inserted strips, and, therefore, a great surface thickness in areas of reduced thickness or in areas of zero thickness. situation, the paper becomes industrially difficult to handle
Indeed, during the integration of wide lines, visible defects appear on the surface of the paper layer, such as loss of material
Method used
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[0079] For the sake of clarity, the relative proportions of the different elements shown are not necessarily consistent, since the views are schematic and in the Figure 4 to Figure 6 In , only one extended region of zero thickness in the first layer of paper material is shown, which is surrounded by two regions of fibrous material.
[0080] figure 1 are diagrams showing different steps of an embodiment of a manufacturing method according to the present invention.
[0081] The first layer 2 with the zero-thickness elongated regions 4 is produced from an aqueous suspension of cellulose fibers by means of a first circular mold, wherein a mask M is provided on the wire mesh of the first circular mold R1. In this way, the suspension of fibers is only deposited in the areas where the mask M is absent. At the same time, a continuous strip of transparent plastic 10 is inserted in the first layer at the mask M, which continuous strip is wider than said mask. In this way, a first mo...
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Abstract
The present invention relates to a process for manufacturing a sheet material comprising at least two fibrous plies juxtaposed one on top of the other, said process comprising the following steps: a first paper ply, which includes at least one elongate region of zero thickness, is produced by filtration of an aqueous suspension of fibres on the wire of a first cylinder mould or of a former; a second paper ply is produced on the wire of a second cylinder mould so as to form at least one recess in the second ply; at least one at least partially transparent element is placed between the two plies that are still wet; and the two plies are joined together so that said at least one recess of the second ply, said at least one at least partially transparent element and said at least one elongate region of zero thickness of the first ply are situated facing one another; and the structure thus obtained is dried.
Description
technical field [0001] The invention relates to a method for manufacturing a paper material comprising at least one window, and a security document obtained by said method. Background technique [0002] Various security papers are known in the prior art, with or without a through window, which in particular allow viewing of security articles placed at the through window. Generally, these windows are holes formed in the security paper and covered by a partially transparent security item, such as a foil or patch that may contain the security item. [0003] The banknote known in patent GB 1,552,853 comprises a paper layer with a security thread integrated inside it. The paper layers include windows facing each other, showing security threads. The windows may be formed using a laser capable of removing material from the paper layer without damaging the security thread. [0004] The security paper known from patent application EP 229645 comprises two paper layers between which...
Claims
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IPC IPC(8): D21F11/08D21H21/42D21H21/44D21H27/30D21H27/32
CPCD21H21/32D21F9/043D21H21/48D21H21/40
Inventor 米歇尔·加缪皮埃尔·达波利特
Owner ARJO WIGGINS SECURITY SAS