LU87478A1 - POSTCARD AND MANUFACTURING METHOD THEREOF - Google Patents

Description

The present invention relates to a special type of postcard of which a part is covered so as to be invisible and, more particularly / a postcard, in which secret information is kept covered during the dispatch of the mail and which the recipient can see at his discretion; as well as its manufacturing process.

For some time now, emails containing secret information, such as a bank account statement, have become increasingly important. Consequently, it has been wished to develop a certain type of postcard, a part of which containing secret information is kept covered during the shipment and which the recipient can easily see. In the text of the publication of the Japanese utility model no. 3789/79, a type of postcard is described, in which a part, for example a spotted part, is kept covered until the moment when it is released by the recipient so that he becomes aware of the secret information thus hidden.

However, to make it partially non-recoverable, as can be seen in the text of the Japanese utility model just mentioned, the entire surface of a cover paper must be coated with a drying paste so as to form an adhesive film and the postcard material must partly, for example in the marked part, be coated with a silicone release agent or the like so that the cover paper can be partially detached. Thus, since the cover paper must be coated with a drying paste and the postcard material must be partially treated with a release agent such as a silicone agent, the construction of such a card postal becomes inevitably complicated and the increase in the number of manufacturing stages results in higher production costs.

Consequently, the subject of the present invention is a postcard, in which the surface treatment of the card material is not necessary by means of compression post-treatment, etc. adhesive material to cover secret information, a partially detachable part and a completely adhering part are separated from each other, where the secret information is covered during mailing and the recipient can easily read them; it also relates to the process for manufacturing a card of this type.

A first invention concerned a postcard ά'μη type consisting of a material for the card and an adhesive material to cover it at least partially, the adhesive material comprising an opaque base material at least in part, an intermediate layer of detachment formed on the main surface of the base material, a layer of synthetic resin formed on the main surface of the intermediate layer with at least a part thereof transparent and an adhesive layer formed on the main surface of the layer of synthetic resin and transparent in the part corresponding to the transparent part of the synthetic resin layer.

A second invention involved a method of manufacturing a postcard of this type, comprising a step of printing or applying image lines on the material of the card, a process of manufacturing an adhesive material during steps A to E, namely a step A of preparing an opaque base material at least in part, a step B consisting in preparing a synthetic resin film or sheet to form a layer of transparent synthetic resin at least partially, a step C forming on the main surface of the film or sheet of synthetic resin, a transparent adhesive layer in the part corresponding to the transparent part of the film or sheet, a step D consisting in printing or applying a layer release agent intermediate on the main surface of the base material or of the synthetic resin film or sheet and a step E of forming a co an intermediate detachment between the base material and the synthetic resin layer made up of the synthetic resin film or sheet by laminating this film or sheet on the basic material using the intermediate release agent, and a step consisting in stick the adhesive material with its adhesive side onto part of the image lines of the card material.

A third invention involved another method of making such a postcard, which included a step of printing or applying image lines to the card material, a step of making an adhesive material comprising steps A to D, namely a step A of preparing an opaque base material at least in part, a step B of forming an intermediate release layer by printing or applying a release agent on the main surface of the base material , a step C of forming a transparent synthetic resin layer at least partially by printing or applying a synthetic resin agent on the main surface of the intermediate release layer and a step D of forming an adhesive layer on the surface of the layer of synthetic resin, this adhesive layer being transparent in the part corresponding to the transparent part of the layer resin, and a step of sticking an adhesive material with its adhesive side on the part having the image lines of the card material.

According to the present invention, the card material comprises the intermediate release layer between the opaque base material and the synthetic resin layer, and the synthetic resin layer is bonded to the card material by means of the adhesive layer, and the base material of the adhesive material can be detached relatively easily since it is weakly bonded to the transparent synthetic resin layer where the intermediate release layer is formed, while the synthetic resin layer is kept relatively bonded strong to the card material under the effect of the adhesion of the adhesive layer even after detachment of the base material from the adhesive material.

According to the present invention, the layer of synthetic resin is bonded to the material of the card, in a relatively strong way, by means of the adhesive layer, while the base material of the adhesive material is bonded to the layer of resin by means of the intermediate release layer in a relatively weak way and is stuck to the card material in an even weaker way, whereby it is possible to detach the base material from the adhesive material from the card material , i.e. the synthetic resin layer formed on top.

After detachment of this basic material, the secret information present on the main surface of the card can be seen through the transparent part of the layer of synthetic resin.

In addition, a postcard can be obtained by pasting the adhesive material without processing the card material, which can be divided to give the base material lightly bonded to the card material and the synthetic resin layer completely. glued, and the user only has to do a simple pasting job, which allows a wide application of this type of postcard.

In addition, during manufacturing, only the adhesive material needs to be processed and that of the card need not be treated, so that the manufacturing process as well as the adhesion machine can be simplified.

The present invention will be clearly understood from the following description given in conjunction with the attached drawings in which:

Figures IA and IB are perspective views of an embodiment of the present invention;

Figures 2A and 2B are sectional views of the previous embodiment;

Figure 3 is an illustration of an example of the manufacturing method of an embodiment of Figure 1;

The figures. 4 and 5 are views of a variant of the previous embodiment, FIG. 4 being a sectional view and FIG. 5 a perspective view partly in puncture;

Figure 6 and Figure 7 are illustrations of an example of the manufacturing process for the embodiment shown in Figure 4;

Figures 8A and 8B are perspective views of another embodiment, and Figures 9A and 9B are sectional views of this embodiment illustrated in Figure 8A;

Figure 10 is a sectional view of a variant of the embodiment illustrated in Figure 9A, and Figure 11 is an illustration of the method of its manufacture;

Figure 12 is a view showing another variant;

Figure 13 is a partially plan view of a separate embodiment of the invention;

FIG. 14 is a partially plan view of a variant of the embodiment of FIG. 13.

In the drawings, Figures IA and IB are perspective views of a postcard according to the present invention. Figures 2A and 2B are sectional views of this embodiment.

The postcard comprises a card material 10 of the official postcard type and an adhesive material 12 glued to a part of the material 10.

The adhesive material 12 comprises a base material 14 made of an opaque material.

The base material 14 is made of a relatively soft material such as paper or a film of synthetic resin.

The base material 14, which must be opaque and must have the possibility of concealment, must be made capable of being covered so as to make it opaque by, for example, printing it with silver ink or the like forming a covering layer or by laminating it with a film or a foil having a possibility of concealment such as an aluminum foil through the use of an adhesive or the like.

On the surface of the concealment layer is formed a portion 16 relating to a lottery in which letters are indicated such as "WINNER" or "LOSER".

The main surface of part 16 is printed or coated with wax, and is formed by an intermediate release layer 18, part of which is made transparent so that part 16 relating to the lottery can be seen.

As the wax constituting the intermediate release layer 18, any of the animal, vegetable, mineral and petroleum-derived waxes can be used, for example natural waxes such as paraffin wax, microcrystalline wax or petrolatum wax. In addition, it is also possible to use, inter alia, Fischer Tropsh wax and its derivatives, synthetic hydrocarbons such as low molecular weight polyethylene and its derivatives, modified waxes such as mineral wax derivatives, derivatives of paraffin wax and wax derivatives, microcrystalline, aliphatic alcohols and acids such as% cetyl alcohol and stearic acid, fatty acid esters such as glyceryl stearate and polyethylene glycol stearate, hydrogenated waxes such as glyceride, beaver wax and opal wax, synthetic amides of ketone amine, and in addition chlorinated hydrocarbons, synthetic animal waxes, synthetic waxes such as alpha-olefin wax are suitable also. It is also possible to use mixtures of waxes containing any of the waxes mentioned above.

On a main surface of the intermediate detachment layer 18 ,. a layer 20 of synthetic resin is formed, transparent at least in part.

This layer 20 is obtained by laminating a film or sheet of synthetic resin on the base material 14 using the adhesion of the intermediate layer 18 or by printing or applying a synthetic resin dissolved in a solvent or dispersed in water.

On a main surface of the layer 20 of synthetic resin, an adhesive layer 22 is formed by printing or applying an adhesive of the self-adhesive type.

As the synthetic resin used to form layer 20, it is possible to use any of the following compounds: polyethylene, the copolymerized resin of ethylene-ethyl acrylate, the copolymerized resin of ethylene-acrylic acid, the copolymerized resin ethylene methyl acrylate, copolymerized ethylene methyl methacrylate resin, copolymerized ethylene methacrylic acid resin, ionomer resin, polymethylpentene resin, copolymerized ethylene vinyl alcohol resin , vinylidene chloride resin, copolymerized vinyl chloride-vinyl acetate resin, polyamide resin, copolymerized stylene-acrylic acid resin, polystylene resin, copolymerized polyacrylic acid resin, resin polyester, polyurethane resin. When printing and coating, the chosen synthetic resin can be dissolved in a so l appropriate or disperse it in water.

The part 16 constituting the lottery can be formed either on the surface of the layer 20 of synthetic resin or on the surface of the material 10 of the card so that it is visible through the layer .20. However, for this, the synthetic resin layer 20 and the adhesive layer 22 must be transparent or translucent. The part 16 can also be formed on the surface of the intermediate release layer 18, and in this case, the layer 18 need not be transparent or translucent.

We will now describe the process for manufacturing a postcard of this type.

The process for manufacturing the adhesive material will first be described, more particularly in conjunction with FIG. 3.

First prepare a piece of paper to form the base material 14 and, if the possibility of concealment of the paper is insufficient, either print its main surface in silver ink using a process of 'known printing such as offset printing, or one proceeds to a coating so as to form a covering layer. Alternatively, for the formation of this concealment layer, an aluminum foil can be glued to the main surface of the paper using, for example, an adhesive of the self-adhesive type and this laminated aluminum foil can be used as base material 14 .. On the surface of this concealment layer, part 16 relating to the lottery is formed by printing or coating.

Furthermore, a laminate 26 must be prepared by laminating the synthetic resin film or sheet used for the manufacture of the layer 20 of synthetic resin on the surface of a laminate with an adhesive layer 22 pre-formed on its top for application of an adhesive of the self-adhesive type on the main surface of a release sheet 24 coated with a release agent.

On the main surface of this adhesive layer 22, the sheet 24 which has the role of continuously supporting the adhesive material 12 divided into a multitude of parts, while covering and protecting the adhesive layer 22, is temporarily glued so that, under the With the effect of the release agent layer formed on the main surface of the sheet 24, the adhesive layer 22 can be easily detached from the sheet 24.

The laminate 26 is mounted in the form of a roll on a holding roller 32 of a manufacturing equipment 30 for the adhesive material. Furthermore, the base material 14 is mounted, also in the form of a roller, on the holding roller 34 of the same equipment 30.

Then, one end is pulled from the rolled laminate 26 and introduced into the coating apparatus 36. The coating apparatus 36 serves to coat the surface of the layer 20 of synthetic resin with an intermediate release agent such as a wax 13a for the formation of the intermediate release layer, comprising two rollers 38a and 38b as well as a storage container 40 and serves to apply by coating the intermediate release agent heated and melted 18a by means of the rollers 38a and 38b subjected to a rotational movement.

As the coating apparatus 36, there may be used a coating machine, such as an engraving roller coating device or roller coating device rotating in opposite directions as well as a well known printing machine such as a offset printing machine or screen printing machine.

Thus, the laminated sheet 26 covered with the intermediate release agent 18a is introduced into a rolling machine 42 for subsequent rolling with the base material 14 as shown in FIG. 3.

The laminating machine 42 serves to laminate a paper 14a to be used as base material 14 on the surface of the release agent 18a, placed on the laminate 26, and comprises a roller 34 to hold the base material 14 in the form of roller.

One end of the paper 14a is extracted and introduced between a roller 44a and its opposite roller 44b.

Then, the laminate 26 coated with the release agent 18a is introduced between the rollers 44a and 44b; consequently, between the rollers 44a and 44b, the paper 14a is placed on the laminate 26 with the release agent 18a placed between them. Then, the laminate 26 with the paper 14a to serve as the base material 14 is introduced into a cooling device 46 or a cooling roller (not shown).

The cooling device 46 serves to cool the release agent 18a applied between the laminate 26 and the paper 14a.

In the cooling device 46, the release agent 18a is cooled and solidified to form the intermediate release layer 18.

As indicated above, the laminated laminate with the base material 14 and the intermediate release layer 18 placed between them is introduced into a stamping assembly 48. The assembly 48 includes a die-cutting device and thanks to it, correct cuts are made in the base material 14, the layer 18, the layer 20 of synthetic resin and the adhesive layer 22. The assembly 48 could also be of the type having an edged roller.

The laminated sheet 26 comprising the basic material Ï4, etc., in which cuts have been made is divided as it passes over a roller 50 between useful parts and unnecessary parts and the unnecessary parts are wound around a roller 52 d 'removal of waste, while the adhesive material. 12 (useful parts) temporarily glued to the release sheet 24 is wound on a roller 54. In place of the stamping assembly 48 and the winding roller 54, a cutting assembly can be used as well. This set includes a cutting blade for making cuts in the base material. 14, the intermediate layer. 18 ,. the synthetic resin layer 20 and the adhesive sheet 22 so as to divide the adhesive material 12 into a multitude of parts.

Then, the adhesive material 12 in the form of a roll is unrolled and passes into an adhesive material bonding assembly in which it is bonded to the material 10 of the postcard. The material 10 can then be pre-cut to the official dimensions of the postcards or else be in the form of a continuous strip perforated in an appropriate manner. The secret information in letters or the like which must be hidden by the adhesive material 12, for example the statement from a person's bank account, must naturally be pre-printed, for example near its lower part of its surface.

For bonding the adhesive material 12 to the postcard, for example, near its lower part, the material 10 is sent in steps. Then, the wound adhesive material 12 is unwound to be introduced into a release plate. Thanks to the use of this plate, the adhesive material 12 and the release sheet 24 are separated. The adhesive material 12 is glued to the surface of the postcard material 10 by compressing the surface of this material after laying the adhesive material 12 on the upper part of the material 10.

When the material 10 and the adhesive material 12 are compressed together, the adhesive material 12 is strongly bonded to the material 10 by means of the layer 20 of synthetic resin, while the base material 14 is bonded weakly due to the presence of the intermediate release layer 18. Consequently, as shown in FIG. 1B and in FIG. 2B, the base material 14 of the adhesive material 12 can be relatively easily detached from the material 10.

As examples of the base material 14, mention may be made, apart from that indicated in the embodiment mentioned above, of synthetic paper, cellophane films, polyethylene, polyester, etc. or aluminum foil, etc. , but it is desirable to choose a relatively soft material otherwise the adhesive material 12 stuck to the material 10 of the postcard will come off accidentally.

When a base material 14 which is excellent in concealment, such as aluminum foil, has been chosen, it is possible to dispense with the formation of a concealment layer as in the case of the previous embodiment.

Although it was chosen in the previous embodiment, a continuous paper in the form of a roll to constitute the base material .14, this can be separated in the form of a sheet.

The surface of the base material 14 can be printed in a mode appropriate to the material 10 of the postcard, and when the material 14, the intermediate layer 18 and the layer 20 of synthetic resin are formed continuously, marks for controlling the pitch of introduction of the adhesive material 12, such as black arrows, can be printed as shown in Figure IA.

Figure 4 is a view of a postcard as a variant of the previous embodiment.

As shown in FIG. 4, the postcard comprises a card material 60 and an adhesive material 62 bonded to the surface of the preceding material, and the material 62 comprises a base material 64, a part 66 forming a lottery, an intermediate layer 68 of detachment, a transparent layer 70 of synthetic resin and an adhesive layer 72.

In the adhesive material 62, part of the layer 70 is stuck directly to the base material 64, as shown in FIG. 5.

Consequently, in the case where the intermediate layer 68 is not formed, the base material 64 is bonded relatively strongly to the layer 70 of synthetic resin so that there is a low risk that the base material 64 accidentally detaches from layer 70 even if intermediate layer 68 is present.

The process for manufacturing the adhesive material 62 illustrated in FIG. 4 will now be described below, mainly in conjunction with FIG. 6 and FIG. 7.

FIG. 6 is an illustration of an example of manufacturing equipment for a laminate 76 obtained by laminating the base material 64 / the intermediate release layer 68 and the layer 70 of synthetic resin. The illustrated manufacturing equipment 80 comprises a roller 82 for holding the strip-like base material 64 in a roll. The base material 64 held by the roller 82 has one of its ends which is extracted and this end is introduced into a coating assembly 84 with an intermediate release agent.

This assembly 84 is used to print or apply to the surface of the base material 64 an intermediate release agent 68a such as a wax, and comprises two rollers 86a and 86b. Agent 68a is applied with roller 86a. Consequently, when the rollers 86a and 86b are rotated, the surface of the base material 64 introduced between them is coated with the agent 68a with the exception of the dots.

As coating assembly 84, it is also possible to use a coating machine of another type or a known printing machine such as an offset printing machine or a screen printing machine.

The base material 64 coated with the release agent 68a is then introduced into a drying assembly 88 in order to solidify the agent 68a.

The laminate with the agent 68a solidified on its surface in the drying assembly 88 is then introduced into a set 90 of synthetic resin coating for the formation on its top of a layer 70 of transparent synthetic resin.

In this assembly 90, the surface of the intermediate release layer 68 of an appropriate thickness formed by the solidification of the agent 68a is printed or coated with an agent 70a of synthetic resin to form on its top a layer of synthetic resin 70 .

The laminate 76 coated with the agent 70a in this coating assembly is wound in the form of a roll after the agent has solidified.

The leaflet! 76 wound on a roll is then, as shown in FIG. 7, loaded into a laminating assembly 94 for the formation of an adhesive layer 72.

In this laminating assembly 94, a release sheet 74 is loaded in the form of a roll, one end of which is extracted and introduced into a coating assembly 96 with an adhesive so that the surface of the release sheet 74 is coated with an adhesive 72a such as an adhesive of the self-adhesive type. The assembly 96 comprises two rollers 98a and 98b.

The roll 98b has its lower part held immersed in the adhesive 72a in the lower part of a container 98c. Therefore, upon rotation of the rollers 98a and 98b, the surface of the release sheet 74 is coated with the adhesive 72a. As coating assembly 96, it is also possible to use a coating machine of another type or a printing machine of a known type such as an offset printing machine or a screen printing machine.

The release sheet 74 thus coated with the adhesive 72a is then introduced into a drying assembly 100 comprising, for example, a heating element.

In the drying assembly 100, the adhesive 72a applied by coating to the surface of the release sheet 74 is dried so as to form the adhesive layer 72. The sheet 74 with the adhesive layer 72 formed on its top is introduced into a rolling assembly 102.

Meanwhile, the laminate 76 is maintained in the form of a coil on a separate roller 104 from which one end is extracted and this end is introduced into the rolling assembly 102. The rolling assembly 102 comprises two rollers 106a and 106b. Between the two rollers 106a and 106b, the laminate consisting of the release sheet 74 and the adhesive layer 72 is conveyed at the same time as the laminate 76 so that the layer 70 of synthetic resin is glued and laminated on the adhesive layer 12 When the rollers 106a and 106b are rotated, the laminate 72 and the layer 70 of synthetic resin are bonded together and the adhesive material 62 is thus formed.

The adhesive material 62 thus formed is wound on a winding roll 110 to be stored in the form of a roll.

If necessary, the roll can be unwound and stamped in the desired shape as described above.

Figures 8A and 8B are perspective views of another embodiment, and Figures 9A and 9B are sectional views of the embodiment of Figure 8A.

Figures 8A and 8B are views of the original state and Figures 8B and 9B are views after release.

In this embodiment, cutouts 128a and 128b are made in an adhesive material 122 bonded to the material 120 of the postcard, where the intermediate release layer 126 is formed, continuously between one end and the other end in parallel and at relative proximity in the vicinity of the left end of a base material 124 so as to allow the separation of this material. In addition, the material 124 between the cutouts 128a and 128b is hollowed out so as to be easily hung by a finger or a nail, and being able to easily detach the material 124 between the cutouts. Alternatively, one can be expected. protrusion at the anterior end of the material 124 between the cutouts 128a and 128b so as to facilitate gripping, instead of the recess mentioned above.

In addition, in the vicinity of the straight edge, a cutout 132 for separation is provided so that the adhesive material 122 detached from the material 120 of the card can be separated from the portion stuck securely by means of the layer 130 of synthetic resin. In this embodiment, a lottery portion 136 is provided on the side 120 of the card material, so as to be visible through the layer 130 of synthetic resin.

The cutouts 128a and 128b as well as the cutout 132 for separation are formed, when the base material 124 is made of paper, in the direction of the fibers so that the material 124 can be easily separated. In fact, in this embodiment, the layer 130 of synthetic resin is bonded directly in the vicinity of the two edges of the base material 124 lest it be detached acc idente1lement.

Figure 10 is a sectional view of another variant of the embodiment of Figure 9A, and Figure 11 illustrates its manufacturing process.

In this variant, a base material 140 and a layer 142 of synthetic resin are strongly bonded together with an adhesive layer 144 placed between them.

As can be seen in FIG. 11, the method of manufacturing the postcard of this variant comprises the steps consisting in first of all forming an adhesive layer 144 on the surface of the base material 144 by coating with an adhesive of the self-adhesive type. sticky, then detach a release paper 146 and laminate it on the surface of the layer 142 of synthetic resin.

FIG. 12 is a view of another variant, in which a base material 150 and an adhesive layer 152 are bonded directly to avoid accidental detachment of the material 150.

In each of the embodiments of the invention, the cutouts can be formed along the edges of the base material. Then the central part of the adhesive material comes off easily. In this case, as shown in FIG. 13, when each cut consists of a part cut linearly and a part cut in a curvilinear manner, respectively, so as to overlap a part of a cut 224 and a part of the cut next 224 in a certain direction to peel off the adhesive material 212, the central part of this material can be peeled off easily. In addition, to easily detach the central part of the adhesive material, as shown in FIG. 14, for example, each linear cut 324 can be formed along the edges of the base material 314 along a slope so as to overlap a part of a cutout 324 and part of the next cutout 324 in a direction allowing the detachment of the adhesive material 312.

The present invention is not limited to the exemplary embodiments which have just been described, it is on the contrary liable to modifications and variants which will appear to those skilled in the art.

Claims (12)

1 - Postcard, characterized in that it comprises: - a material (10) for a card of appropriate dimensions; and - an adhesive material (12) bonded to the material of the card to cover at least part of it; - the adhesive material comprising, in turn: - a base material (14) at least partially opaque; - - an intermediate release layer (18) formed on the main surface of the base material; - a layer of synthetic resin (20) formed on the main surface of the intermediate layer, transparent at least in part; and - an adhesive layer (22) formed on the main surface of the synthetic resin layer, transparent in the part corresponding to the transparent part of the synthetic resin layer. 2 - Postcard according to claim 1, characterized in that the adhesive material (12) is glued so as to cover the part of the surface of the card material where there is secret information. 3 - Postcard according to claim 1, characterized in that the base material (14) has a covering layer formed on the main surface of the side on which the intermediate release layer (18) is located. 4 - Postcard according to claim 1, characterized in that the intermediate release layer (18) is obtained by printing or coating with a wax. 5 - Method for manufacturing a postcard, characterized in that it comprises the steps consisting in: - printing image lines; - follow a manufacturing process of an adhesive material (12), containing the following steps A to E ^ namely: A: a step of preparing a base material (14) opaque to. less in part; B: a step of preparing a synthetic resin film or sheet (20) in order to form a transparent synthetic resin layer at least in part; C: a step of forming on a main surface of the synthetic resin film or sheet an adhesive layer (22) transparent in the part corresponding to the transparent part of the synthetic film or · sheet; D: a printing or coating step with an intermediate release agent on a main surface of the base material or of the synthetic resin film or sheet; E: a step of forming an intermediate release layer (24) between the base material and the film or sheet of synthetic resin by laminating this film or sheet on the base material with the use of the intermediate release agent; and a step of bonding the adhesive material with its adhesive layer side to the image line part of the card material. 6 - A method of manufacturing a postcard according to claim 5, characterized in that the image lines on the material. (10) of the card representing secret information printed or applied by coating. 7 - A method of manufacturing a postcard according to claim 5, characterized in that it comprises a step of preparing the base material with a covering layer formed on its main surface. 8 - Process for manufacturing a postcard according to claim 5, characterized in that the intermediate detachment agent is a wax. 9 - Method for manufacturing a postcard, characterized in that it comprises: - a step of printing image lines on a card material; a process for manufacturing an adhesive material comprising the following steps A to D, namely: A: a step for preparing a base material, opaque at least in part; B; a step of forming an intermediate release layer by printing or applying an intermediate release agent on the main surface of the base material; C: a step of forming a synthetic resin layer, transparent at least in part, by printing or applying a synthetic resin agent on the main surface of the intermediate release layer; D: a step of forming an adhesive layer on the surface of the synthetic resin layer, the adhesive layer being transparent in the part corresponding to the transparent part of the synthetic resin layer; and a step of bonding the adhesive material with the adhesive layer side on the image line part of the card material. 10 - A method of manufacturing a postcard according to claim 9, characterized in that the image lines placed on the card material are formed by printing secret information ou.application this information by coating. 11 - A method of manufacturing a postcard according to claim 9, characterized by a step of preparing the base material with a covering layer formed on its main surface. 12 - A method of manufacturing a postcard according to claim 9, characterized in that the intermediate detachment agent is a wax.