KR0134670B1 - Secure image production - Google Patents

Abstract

A component bearing an image is produced by printing the image (12) on a layer (11) of a high temperature glue which has been applied to a layer of a transparent medium (10). The image is printed on the glue layer using carbon or a carbon-containing compound that does not flow when applied to the glue surface. The component consisting of transparent medium, high temperature glue and image is then bonded to a substrate (13) using a thermal bonding process to produce a laminate of the transparent medium and the substrate. The image is not distorted by the thermal bonding process, but remains clearly visible through the transparent medium. Typically the transparent medium will be a polyester film or a sheet of glass beads dispersed in glue. One or more additional layers (27) may be bonded to the substrate (13) to increase the stiffness of the product laminate. <IMAGE>

Description

[Name of invention]

How to Form an Image in Sheet Metal

[Brief Description of Drawings]

1 is a partial cross-sectional view of a sheet of transparent polyester material bonded to a backside on which an image is printed using an adhesive.

2 is a partial cross-sectional view of a glass bead thin film plane bonded to a substrate with a hot adhesive layer.

Detailed description of the invention

[Technical Field]

The present invention relates to the manufacture of confidential documents such as passports, identity documents, identification tags and labels, motor vehicle driver's licenses. In particular, the present invention relates to a technique for providing a thin layer structure with a printed image that is safer than the image obtained by conventional means.

[background]

Conventional methods for producing identification cards, identification tags, etc. include the steps of (i) attaching a photograph on the back of a thin card, and (ii) sandwiching the card (with a photograph attached) between two transparent plastic sheets. Loading and (iii) joining the transparent sheets together (using heat) at their edges. However, these cards and tables do not have the degree of confidentiality required for a passport to pass through areas with classified information, which cuts cards and tables near the edge of the transparent sheet, removing the card and replacing it with a new picture. After that, it is possible to seal the modified card between two new transparent plastic sheetings.

Conventional passport manufacturing techniques use a conventional paper adhesive to attach a photograph to the ground of the passport, and a transparent strip of glass of polyester material or a glass bead lamination (adhered to the photograph) to one side of the passport. Covering. This method improves its security since the picture is covered by transparent strip or glass technology. However, after any person has detached the elements of the passport ground, it is possible to use this technique to replace the photograph attached to the passport with a new photograph.

To improve the security of passports and identity documents, rather than simply attach photos on sheets, information about the photos (including images of passport or identity holders) is printed on the sheets of passports or cards, and the It has been proposed to cover the printed image to prevent intentional (or inadvertent) removal. However, there are no economically and technically feasible techniques for implementing this method.

[Description of the Invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a technique for generating an image in a thin layer formed by a layer of sheets and transparent media such as paper, card, etc., which satisfies the requirements for the manufacture of safer passports, identity cards, confidential tables, identification labels and the like. It is.

This purpose is that an image may be formed at a low temperature of a layer of low temperature adhesive (ie, an adhesive having a melting point of about 95 ° C.) and used to produce an image in which toner or other carbon containing material is set when the adhesive layer is heated. In this case it can be achieved by the present invention that the image is not damaged. Thus, a sheet of transparent medium (e.g., a layer of polyester material or glass beads) has a side coated with a high temperature adhesive, and the image is printed on the adhesive layer and thermally treated, for example using laser zeroography technology or printing ink. By successive bonding of transparent materials to paper sheets or other substrates, the images can be provided with toner or ink for printing of the image set on the adhesive before thermal bonding is performed to form without deterioration in the sheet. When the image includes printing, the printing is machine readable.

Compounds other than carbon or carbon containing compounds may be used to form machine readable characters, provided they have high absorption of radiation with wavelengths in the visible spectrum or near the infrared region.

Accordingly, the present invention provides a method for providing an image forming component in a gas tight sheet, the method

(a) providing a high temperature adhesive layer on one side of the transparent medium sheet;

(b) forming an image on the adhesive layer using carbon, a carbon-containing compound, or other radiation absorbing compound that does not flow when applied to the adhesive layer and allows, if necessary, to set the image forming compound.

In order to make a confidential certificate using an image forming component normally, the present invention comprises the steps of: (i) applying a substrate to a hot adhesive layer on which an image is generated; (ii) further comprising bonding the transparent medium to the substrate using known hot thermal bonding treatments.

Since thermal bonding techniques for high temperature bonding are well known, the detailed description thereof will be omitted.

The thin plates are manufactured by some manufacturers in the form of sheets of transparent media to which a high temperature adhesive layer is applied. Such products may also be used in the present invention.

Another product which is commercially available and can be used in the present invention is a thin plate comprising a layer of glass beads in a binder material (adhesive) having a thin hot adhesive layer bonded to one side.

Thus, in the present invention the image (which may be composed of printing) can be seen through the transparent medium, and the image is printed qualitatively on the adhesive as an inverted image.

Without limiting the generality of the carbon-containing or radiation absorbing compound that may be used in the present invention, the image is subjected to inkjet print (the ink used is selected to be provided so as not to flow on the contact surface with the adhesive layer) by laser zeroography or other photocopying technique. By means of a dot matrix printer using a typewriter ribbon (preferably a carbon typewriter ribbon) or by a typewriter that prints a mirror image of the normal characters of the typewriter. Inkjet printers and dot matrix printers can be used to form the same photographic image by printing of appropriate dots. Printing of the image is performed by programming the printer after scanning the image to determine the dot density of the pixels forming the image. Clearly, if the typewriter ribbon is a medium having carbon or a carbon containing compound applied to the adhesive layer, there is no need to set the material of the image prior to performing the thermal bonding step of the present invention.

When a programmable printer is used in the image forming step of the present invention, the entire surface of the passport, which consists of photographic images and lettering, or the entire identity card or identification table can be printed by the printer.

If the printer used in the lettering format cannot be used to form a photographic image, a passport page or identification card or identification card may be formed in two printing steps.

The first printing step forms the necessary lettering image, and the second printing step provides a photographic image of the owner or passport holder of the identification card or identification card (the image can of course be printed prior to lettering). An adhesive layer comprising the two print images is in contact with the substrate, and high temperature heat treatment is used to complete the passport page or identification card or removal.

Typically the transparent sheet material may be a polyester material, such as the material sold under the Mylar trademark, which has flexibility and transparency, or may be a layer of glass beads in the adhesive layer. Such materials are commercially available by applying a hot adhesive layer to one side of the transparent sheet.

If the final thin film requires a high degree of firmness, one or more layers of suitable material may be bonded to the thin film substrate of the present invention, preferably (but not required) using high temperature adhesive bonding techniques.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Detailed Description of the Embodiments

1 shows a transparent polyester material such as Maylar (trade name) or another known flexible transparent polyester material available in the form of a sheet to which a thin film of known high temperature adhesive 11 is applied on one side by a manufacturer. The sheet 10 is shown. The high temperature thin film adhesive layer is also transparent.

FIG. 2 shows a glass grain thin film comprising a glass bead layer 20 at an adhesive portion, one side 11 of which has a high temperature adhesive layer. An optional sheet 26 on the back is provided to enhance the firmness of the thin film and to protect the glass beads of the layer 20.

Typically, the image is inverted from the image, and the image related to the display characters through the transparent sheet 10 or 20 in the direction of arrow A is printed using carbon or a carbon-containing compound in the region 12 of the adhesive layer 11. . As mentioned above, laser zeroography is an easy way to make such an image. Although the image forming method is good, it is well known that the use of scanners and programmable printers is increasing. And with advances in technology, programmable printers are becoming good devices for forming images.

As in the example shown in the figure, when the image is partially lettering, the lettering of the image must be applied to the adhesive layer before or after the image of the photographic image is applied.

When the image is made using print ink or by zero-graphing process, the toner must be set and the ink must be dried before the next step is taken in the manufacturing process of forming the thin film. Typically the setting and drying process takes place during extremely short cigars. When actual laser zeroography is used to make the image, the heat required to set the toner is applied as part of the printing process. Although the heat of application for setting the toner is sufficient to melt the hot adhesive, the adhesive layer 11 itself does not soften while passing through the printer.

When the toner of the image is set or the ink used to print the image is dried, the transparent sheet 10, 20 is placed on a substrate of paper or other suitable material and the transparent sheet 10, 20 and the substrate ( 13) has an adhesive layer sandwiched between. The substrate 13 may have information printed on itself in the outer region 14 covered by the image region 12 of the adhesive layer 11.

The sandwiches of the sheets 10, 20 with the substrate 13 are heated by conventional processing methods to bond the transparent sheets 10, 20 to the substrate 13 to form a substrate consisting of two sheets. According to this step, it is very difficult to separate the sheets 10 and 20 from the substrate 13. The sandwich component temperature is raised to at least 95 ° C. such that the hot adhesive layer 11 can bond to the sheets 10, 20 and the substrate 13, and during this heat treatment the printed image is damaged in the adhesive layer and during operation. No damage to clarity and clarity, even if damaged, despite the melting of the adhesive during the hot bonding process.

After the heat treatment step, the substrate 13 of the thin film may be bonded to an additional sheet 27 of paper or card or other suitable material to form a thick, rigid thin film. Such additional bonding may or may not damage the original image on region 12 of the base film. Tests using the images made by the present invention indicate the case involving the image alpha-numeric characters. These characters are machine readable at the request of International Civil Aviation Organization Specification No. 9303. The present invention thus provides stable machine-reading characteristics for passports and other travel documents.

When the glass egg thin film of FIG. 2 is used, the protective back sheet 26 is stripped from the thin film to expose the outer surface of the transparent layer 20 after its formation.

By using the technique according to the present invention, it is possible to improve the durability and stability of the identification card, the passport page, the security pass, the identification level, and the like, by making them by the conventional method.

Those skilled in the art will recognize that although two embodiments of the present invention have been described in detail, modifications of the embodiments are possible without departing from the concept of the present invention.

Claims (20)

CLAIMS 1. A method for providing an image forming component in an airtight thin plate, the method comprising: (a) providing a layer (11) of hot adhesive on one side of a sheet of transparent medium (10,20); (b) forming an image 12 on the adhesive layer using carbon or a carbon containing or other radiation absorbing compound that does not flow when applied to the adhesive layer and, if necessary, when setting the image forming compound. Way. 2. The method of claim 1, further comprising the steps of: (c) applying a substrate (13) to the hot adhesive layer on which the image is formed; (d) bonding the transparent medium to the substrate using a high temperature thermal bonding treatment. 3. The method of claim 2, further comprising the step of bonding at least one additional layer (27) to the confidential document to increase the robustness of the confidential document. The method according to any one of claims 1 to 3, wherein the transparent medium is a polyester sheet (10). The method according to any one of claims 1 to 3, wherein the transparent medium (20) comprises glass beads arranged in an adhesive layer. The method of claim 1, wherein the image is formed on the high temperature adhesive layer by a zero-graphing treatment, and wherein the radiation absorbing compound is a toner used for the zero-graphing treatment. The method of claim 1, wherein the image is formed on the adhesive layer using an inkjet printer, and wherein the radiation absorbing compound is ink deposited by the printer. The method of claim 1, wherein the image is formed using a programmable printer. The method of claim 1, wherein the image comprises a photographic image. The method of claim 1, wherein the image comprises a photographic image and alpha-numeric characters. A thin plate produced by the method of any one of claims 1 to 10. Airtight, characterized in that it comprises sheets (10,20) of a transparent medium having a high temperature adhesive layer (11) on one side and an image (12) formed on the adhesive layer by carbon or a carbon-containing compound or other radiation absorbing compound. Lamination. A confidential document comprising a hermetic thin plate as described in claim 12 and a substrate (13), said thin plate being bonded onto said substrate using said adhesive layer. The confidential document as claimed in claim 13, wherein the image is machine readable. The hermetic thin plate according to claim 15, wherein the transparent medium (10) is a sheet of polyester. The hermetic thin plate according to claim 12, wherein the transparent medium (20) comprises glass beads arranged in an adhesive layer. The hermetic thin plate according to claim 12, wherein the image comprises a toner deposited on the high temperature adhesive layer by a zero-graphing process. 13. The hermetic foil according to claim 12, wherein the image comprises ink deposited on the high temperature adhesive layer using an inkjet printer. 13. The hermetic laminate according to claim 12, wherein the image comprises a photographic image. 13. The hermetic laminate of claim 12, wherein the image comprises a photographic image and an alphabe-numeric character.