Printed matter – Having revealable concealed information – fraud preventer or... – By mating or cooperating separable components
Reexamination Certificate
2001-11-09
2003-04-08
Wellington, A. L. (Department: 3722)
Printed matter
Having revealable concealed information, fraud preventer or...
By mating or cooperating separable components
C283S067000, C283S070000, C283S072000, C283S086000, C283S091000, C283S094000, C283S117000, C283S901000, C283S902000
Reexamination Certificate
active
06543810
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a method for production of a film which has a surface made of synthetic material, known as the outer surface, which is designed to be on view, and a symbol or pattern, which prevents reproduction by optical scanning, and is visible from this outer surface side. The invention also extends to a film of this type, a protective transfer comprising a film of this type, a method for protection of a document or other element by means of a film of this type or a transfer of this type, and a document thus protected by means of a film of this type.
DESCRIPTION OF THE RELATED ART
In order to prevent reproduction by optical scanning (photocopy, photograph, scanner, etc) of official documents such as bank notes, credit cards, cheques, identity documents, etc, it is already known (FR-2 429 292) to use a paper or a printing support comprising iridescent patterns which produce visual effects which vary according to the direction of observation. This iridescence is obtained by adding an iridescent composition to the surface of the paper or printing support.
However, in this method, simply scratching the surface makes it possible to remove the iridescent composition of an original. In addition, the same iridescent patterns can be produced on the support used for reproduction of the document, before or after this reproduction.
In addition, use of these iridescent compositions is costly, and complicates considerably the production of the paper or printing support, and of the document obtained.
EP-A-0,429,782 describes micro-structures such as holograms on printed bank notes. In order to use these micro-structures, an embossed security profile is used, which has a specific number of embossed lines recessed and/or in relief, and flat intermediate spaces. The security profile is inserted by embossing, after application onto the note of a sheet comprising the security micro-structure. It should thus be noted that all the facets defined by the embossing lines have the same condition of glossiness.
SUMMARY OF THE INVENTION
The object of these micro-structures is to combat forgery, and not to prevent reproduction by optical scanning. In addition, production of these micro-structures is problematic and costly.
The object of the invention is thus to eliminate these disadvantages, by providing a more efficient method for protection of documents against reproduction by optical scanning. The object of the invention is also to provide a method of this type, which is simple, cheap, and does not complicate the production either of the printing support, or that of the document itself.
For this purpose, the invention relates to a method for protection of a surface of a document, against reproduction by optical scanning, wherein there is applied irreversibly to this surface at least one film which has an imprint recessed in one surface, known as the outer surface, which is on view, of a layer of synthetic material of the film, this imprint having a surface condition which is more glossy than the remainder of the said outer surface, this imprint forming a symbol or pattern which is on view, and prevents reproduction of the document by optical scanning.
The expression “the film is applied irreversibly” means that the film can then no longer be separated from the document without damaging or destroying the film and/or the document.
Throughout the text, “an imprint” means one or a plurality of combined or separate marks of any shape which are recessed. This imprint forms a symbol (which in particular can be character, and/or a group of characters, and/or a letter, and/or a group of letters, and/or a word, and/or a group of words, and/or a drawing, and/or a group of drawings, and/or a combination of these symbols), or a pattern, ie. a plurality of symbols which can be repeated regularly or non-regularly.
Throughout the text, a surface is said to be glossy when it has glossiness in white light at 85° (angle of incidence of the light), for example measured on the BYK GARDNER brightness measurer, greater than 50%; a surface is said to be non-glossy when it has glossiness in white light at 85° of less than 50%, a surface is said to be matt when it has glossiness in white light at 85° of less than 30%. In the case of layers produced by printing, and in particular by silk-screen printing, it is known that the glossiness is associated with the surface condition. Thus, a surface is more glossy when its surface condition is less rough. The glossiness or dullness of a surface can thus also be evaluated by measuring the roughness.
Advantageously and according to the invention, the film is applied to the surface of the document by means of an adhesive. Advantageously and according to the invention, a film formed from a plurality of layers is used, the layer which has the said outer surface being a matt polyurethane layer which is provided with an imprint which is recessed and has a glossy surface condition.
The object of the invention is also to provide means for implementing this method for protection, ie. a film which is designed to be used in this method for protection, a protective transfer, and a method for production of a film of this type, and of a protective transfer of this type.
Throughout the text, “transfer” means a product which comprises at least one film and one support sheet, and which is designed to permit application of the film onto a surface of a document to be protected, the film being transferred from the support sheet onto the surface of the document by contact and activation of an adhesive which bonds the film and the surface of the document, and separation of the support sheet.
The invention thus also relates to a method for production of a film which has a surface made of synthetic material, known as the outer surface, which is designed to be on view, and a symbol or pattern which prevents reproduction by optical scanning, and can be seen from this outer surface side, wherein
a support sheet with a non-glossy surface is selected, onto which the synthetic material of the said outer surface of the film does not adhere;
on the said non-glossy surface, a first, discontinuous imprint is produced by means of a printing composition, which, after hardening and/or drying, forms a varnish which adheres to the said non-glossy surface, this varnish having a surface condition which is more glossy than that of the said non-glossy surface, and which in particular is a glossy surface condition;
subsequently, on this first imprint, there is produced a second continuous imprint of a printing composition, which, after hardening and/or drying, forms a layer of synthetic material, one surface of which, which is in contact with the said non-glossy surface and with the varnish, constitutes the said outer surface of the film, which does not adhere to the said non-glossy surface, this layer of synthetic material being compatible with the varnish of the first imprint, and not adhering to this varnish, or adhering to this varnish less strongly than this varnish adheres itself to the said non-glossy surface of the support sheet, such that, after subsequent separation of the film and the support sheet, this varnish continues to be associated with the support sheet, the said outer surface of the film having a more glossy imprint, and in particular a glossy imprint, which is left by the varnish recessed in the said outer surface, and forms a symbol or pattern which is on view, and prevents reproduction by optical scanning; and
production of the film is completed above the said layer of synthetic material.
Advantageously and according to the invention, as the printing composition for the first imprint, there is used a bonding agent comprising a rubber derivative which forms a glossy varnish, and in particular a blending base comprising a rubber derivative for silk-screen printing ink.
Advantageously and according to the invention, as the printing composition for the second imprint, there is used a two-component mixture which can be polymerised in situ, which, after polymerisation, fo
Henderson Mark T.
Wellington A. L.
Young & Thompson
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