GB2231311A

GB2231311A - Postcard for mailing secret information

Info

Publication number: GB2231311A
Application number: GB9005980A
Authority: GB
Inventors: Noboru Matsuguchi; Tadashi Matsuguchi
Original assignee: Daimatsu Kagaku Kogyo Co Ltd
Current assignee: Daimatsu Kagaku Kogyo Co Ltd
Priority date: 1989-03-17
Filing date: 1990-03-16
Publication date: 1990-11-14
Also published as: NL9000610A; IT1239391B; FR2644395A1; CA2012438A1; AU5145590A; JPH02245389A; LU87702A1; IT9019665A0; IT9019665A1; DE4008555A1; GB9005980D0

Description

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SPECIFICATION

TITLE OF THE INVENTION

POSTCARD AND ITS MANUFACTURING METHOD BACKGROUND OF THE INVENTION FIELD OF THE INVENTION

The present invention relates to a special kind of postcard with a part thereof covered to be invisible, more particularly to a post-card with the part wherein secret information is shown is kept covered during mailing and the due recipient can see it on his own discretion, and a method of manufacturing it.

DESCRIPTION OF THE PRIOR ART

Recently mails containing secret information such as the balance of a person's bank deposit has been increasing. It has, therefore, been desired to develop a kind of postcard, a part of which containing secret information is kept covered during mailing, and the due recipient can see it without difficulty. And, as seen from the text of Japanese Utility Model Publication NO.3789/'79, a kind of post card, of which a part, for instance, a marked part is kept covered until it is uncovered by the due recipient to see the secret information hidden thereunder.

To make it partly uncoverable, however, as seen from the text of the aforementioned Japanese Utility Model 1 Publication No. 3789/'79, the entire surface of a covering paper has to be coated with a drying paste to form an adhesive film and the postcard material is partly, for instance, in the marked part has to be coated with a silicone release agent or the like so that the covering paper can be peeld off partly. Thus, since the covering paper has to be coated with a drying paste and the postcard material has to be partly treated with a release agent such as one based on silicone, the construction of such post-card becomes inevitably complicated and the increased number of the manufacturing steps results in an increased manufacturing cost.

SUMMARY OF THE INVENTION

Therefore, it is a principal object of the present invention to provide a postcard, in which surface treatment of the postcard material is not required any only by postprocessing by pressing and so on of the sticking material for covering a secret information, a part which is possible to be peeld off partly and a part which is adhered completely are divided, in which the secret imformation is covered during mailing by post and the due recipient can see the secret information easily, and a manufacturing method thereof.

A f irst invention involved relates to a kind of a postcard comprising: a postcard material; and a sticking 2 material which is formed integral with said postcard material and is stuck to at least a part of said postcard material in folded-back fashion; said sticking material comprising:

base material opaque at least partly; an inter-layer peel ply formed on the principal surface of said base material; a synthetic resin layer formed on the principal surf ace of said inter-layer peel ply, being transparent at least partly; and an adhesive layer formed on the principal surface of said synthetic resin layer, being transparent in the part corresponding to the transparent part of said synthetic resin layer.

A second invention involved relates to a method of manufacturing a postcard comprising: a process of preparing a postcard stuff comprising a postcard material and a base material which is formed integral with said postcard material, and stuck to at least part of said postcard material in a folded-back fashion; a process of manufacturing a sticking material comprising the following steps (A) to (D), namely (A) a step of preparing a synthetic resin film or sheet for forming a synthetic resin layer transparent at least partly on one principal surface of the base material; (B) a step of forming on one principal surface of said synthetic resin film or sheet an adhesive layer transparent in the part corresponding to the transparent part of said synthetic resin film or sheet; 3 (C) a step of printing or coating an inter-layer release agent on one principal surface of said base material ox synthetic resin film or sheet; (D) a step of f orin ing an inter-layer peel ply between said base material and said synthetic resin film or sheet by lawinating said synthetic resin film or sheet on said base using said inter-layer release agent; and a step of sticking said sticking material with its adhesive layer on the principal surface of said postcard material in a folded-back fashion.

A invention involved relates to another method of a process of a postcard stuf,'- compr"lsing a postcard material and a base materia--''. which is formed integral with said postcard material, and stuck to at least part of said postcard material in a folded-back fashion a process of manufacturing a sticking material comprising the following steps (A'P to (C), namely (A) a step of forming an inter-layer peel ply by printing or coating a inter-layer agent on the princiapl surface of said base 1; (B) a step of forming a synthetic resin layer transparent at least partly by printing coating a synthetic resin agent on the principal surface of said innerlayer peel ply; (C) a step of forming an adhesive layer on the surface of said synthetic resin layer release materia 4 or said adhesive layer being transparent in the part corresponding to the transparent part of said synthetic resin layer; and a step of sticking said sticking material with said adhesive layer on the principal surface of said postcard material in a folded-back fashion.

According to the present invention, the sticking material has the interlayer peel ply between the opaque base material and the synthetic resin layer and the aforementioned synthetic resin layer is stuck to the postcard material by means of the adhesive layer, and the base material of the sticking material can be peeled off with a relative ease as it is stuck to the transparent synthetic resin layer relatively weakly where the inter-layer peel ply is formed, while the synthetic resin layer is kept stuck to the postcard material relatively strongly by the adhesion of the adhesive layer even after the base material of the sticking material is peeled off.

According to the present invention, the synthetic resin layer is stuck to the postcard material by means of the adhesive layer relatively strongly, while the base material of the sticking material is stuck to the synthetic resin layer by means of the inter-layer peel ply relatively weakly and is stuck to the postcard material still weaker, hence the base material of the sticking material can be peeled off the postcard material, that is, the synthetic resin layer formed thereon. After the base material of the sticking material has been peeled off the postcard material, the secret information on the principal surface of the postcard material can be seen through the transparent part of the synth6tic resin layer.

Moreover, by sticking the sticking material without processing the postcard material, a postcard, which can be divided into the base material stuck weakly on the postcard material and the synthetic resin layer stuck completely, can be obtained, and the user is required only to do a simple pasting work, this making this type of postcard widely applicable.

Furthermore,the postcard is just needed to be processed to the sticking material in manufacturing and the postcard material is not necessary to be processed, so that its manufacturing process as well as an adhesion machine of a sticking material can be simplified with ease for the user.

The aforementioned objects and other objects, features and advantages of the present invention will become more apparent from reading of the detailed description of the embodiments given below under reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A and FIG. 1B are perspective views showing a 6 postcard embodying of the present invention.

FIG. 2A and FIG. 2B are sectional views showing-the above embodiment.

FIG. 3 is an illustrative view showing an example of the method of manufacturing the embodiment shown in FIG. 1.

FIG. 4 is an illustrative view of a manufacturing apparatus showing an example of a method of manufacturing a postcard material.

FIG. 5 and FIG. 6 are views showing a variation of the aforementioned embodiment, of which FIG. 5 is a sectional view and FIG. 6 is a partly broken-out perspective view.

FIG. 7 and FIG. 8 are illustrative views showing an example of the manufacturing method for the embodiment shown in FIG. 5.

FIG. 9A and FIG. 9B are perspective views showing another embodiment, and FIG.10A and FIG.10B are sectional views of the embodiment illustrated in fig. 9A.

FIG. 11 is a sectional view showing a variation of the embodiment illustrated in FIG.10A, and FIG. 12 is an illustrative view showing the method of manufacturing it.

FIG. 13 is a view showing another variation thereof.

FIG. 14 is a plan view showing an another embodiment of the invention.

FIG. 15 is a embodiment of FIG.

plan view showing a modification of the 14.

7 DESCRIPTION OF THE PREFERRED EMBODIMENT

FIG. 1A and FIG. 1B are perspective views showing a postcard embodying the present invention.

FIG. 2A and FIG. 2B are sectional views of the aforementioned embodiment.

This postcard comprises a postcard stuff 10, and the postcard stuff 10 comprises a postcard material 11 formed in the size of the government postcard and a sticking material, that is to say. a covering material 12 stuck to part of this postcard material 11. The covering material 12 is formed integral with the postcard material 11 in a manner of extending from one end thereof and is stuck to the postcard material 11 in a foldedback fashion.

This covering material 12 includes a transparent base material 14 which is formed integral with the postcard material 11 in a manner of extending from one end thereof.

This basematerial 14 is formedof a relatively soft material such as paper or a synthetic resin film.

This base material 14, which is required to be opaque and have a suppressivenesso has to be made capable of covering by making it opaque by, for instance, printing it with a silver ink or the like to thereby form a suppression layer or laminating it with a film or foil having suppressiveness such as aluminum foil by the use of an adhesive or the like.

8 The surfaceof the suppression layer hasformed therein a lottery part 16 wherein are shown letters such as "WINNING" or "BLANC.

The principal surface of the lottery part 16 of the aforementioned base material 14 is printed or coated with a wax and there is formed an interlayer peel ply 18. a part of which is made transparent so that the lottery part 16 can be seen through.

As the wax forming this inter-layer peel ply 18 may be used any of the aminal, vegetable, mineral and petroleumderived waxes, for instance, natural waxes such as paraffin wax, microcrystalline wax or petrolatum wax. Besides, also usable are, among others, Fischer tropush wax and its derivatives, synthetic hydrocarbons such as low-molecular polyethylene and its derivatives, modified waxes such as montan wax derivatives, paraffin wax derivatives and microcrystalline wax derivatives, aliphatic alcohols and acids such as cetyl alcohol and stearic acid, fatty acid esters such us glyceryl stearate and polyethylene glycol stearate, hydrogenated waxes such as glyceride, castor wax and opal wax, synthetic ketone amine amides such as armor wax and acra wax and, further, chlorinated bydrocarbons, synthetic aminal waxes, synthetic waxes such as alpha-olefin wax are as well usable. it is also possible to use mixed waxes containing any of the aforementioned waxes.

9 on one principal surface of the inter-layer peel ply18, there is formed a synthetic resin layer 20 transparent at least partly.

This synthetic resin layer 20 is formed by laminating a synthetic resin film or sheet on the base material 14 by the use of the adhesion of the aforementioned inter-layer peel ply 18 or by printing or coating a synthetic resin dissolved in a solvent or dispersed in water.

on the principal surface of the aforementioned synthetic resin layer 20, an adhesive layer 22 is formed by printing or coating an adhesive of the pressure sensitive type.

As the synthetic resin used for forming the aforementioned synthetic resin layer 20 may be used any of polyethylene, ethylene-ethylacrylate copolymer resin, ethylene-acrylic acid copolymer resin, ethylene-methyl acrylate copolymer resin, ethylene methylmethacrylate copolymer resin, ethylene -methacryl ic acid copolymer resin, ionomer resin, polymethyl pentene resin, ethylene-vinyl alcohol copolymer resin, vinylidene chloride resin, vinyl chloride-vinyl acetate copolymer resin, polyamide resin, styrene-acrylic acid copolymer resin, polystyrene resin, polyacrylic acid copolymer resin, polyester resin,and polyurethane resin. For printing or coating with any thereof, the selected synthetic resin may be dissolved in a proper solvent or dispersed in water.

The lottery part 16 may be formed either on the surface of the aforementioned synthetic resin layer 20 or on - the surface of the postcard material 10 to be visible through the synthetic resin layer 20. For that, however, the synthetic resin layer 20 and the adhesive layer 22 have to be made transparent or translucent. The lottery part 16 may as well be formed on the surface of the inter-layer peel ply 18, and in this case the inter-layer peel ply 18 need not be transparent or translucent.

Now, the method of manufacturing a postcard of this kind is described.

First, continuous paper for forming the postcard stuff 10 is prepared. The postcard material 11 portion and the base material 14 portion are formed continuously in the direction of width of this continuous paper. Accordingly, the length of the continuous paper in the direction of width is a sum of the length of the postcard material 11 and the length of the base material 14.

If the base material 14 of this continuous paper is insufficient, either principal surface thereof is solidprinted with a silver ink by a known printing method such as offset printing or by coating to thereby form a suppression layer.

Meanwhile, an adhesive layer 22 is preformed thereon by application of an adhesive of pressure sensitive type on the principal surface of a release sheet 24 coated with a release agent. A laminate 26 is to be prepared by laminating the synthetic resin film or sheet used for forming the synthetic resin layer 20 on the surface of a laminate with.

This laminate 26 in a rolled form is mounted on the holding roller 32 of a manufacturing equipment 30 for the covering material. Meanwhile, the postcard stuff 10 also in a rolled form, is mounted on the holding roller 34 of the same equipment 30.

Then, one end of the rolled-up laminate 26 is pulled out and led into the coating apparatus 36.

This coating apparatus 36 is for coating the surface of the synthetic resin layer 20 with an inter-layer release agent 18a for formation of the inter-layer peel ply thereon, comprising two rollers 38a and 38b and also a storage vessel 40 and serves to apply by coating the heated and molten inter-layer release agent 18a with the rollers 38a and 38b being revolved.

As this coating apparatus 36, a coating machine such as gravure roll coater or reverse roll coater may be used as well as an well-known printing machine such as offset printing machine or screen printing machine.

Thus, the laminate 26 coated with the inter-layer release agent 18a is led into a laminating machine 42 for further lamination with the base material 14 of the 12 postcard stuff 10 as shown in FIG. 3.

The laminating machine 42 is for laminating a base material portion 14a to serve as the base material 14 on the surface of the inter-layer release agent 18a coated on the laminate 26, is arranged on the path for the laminate 26, and includes a holding roller 34 for holding the base material 14 in roll form.

This postcard stuff 10 has one end pulled out and this is introduced between the roller 44a and the opposing roller 44b. Then, the laminate 26 coated with the interlayer release agent 18a is being led between the rollers 44a and 44b, hence between these rollers 44a and 44b the base material portion 14a of the postcard stuff 10 is laid on the laminate 26 with the inter-layer release agent 18a, in between. Thus, the laminate 26 with the base material portion 14a to serve as the base material 14 laid thereon is led through a cooler 46 or cooling roller (not shown).

The cooler 46 is for cooling the inter-layer release agent 18a applied between the laminate 26 and the base material portion 14a.

In the cooler46, the inter-layer release agent 18a sandwiched between the laminate 26 and the base material portion 14a is cooled and solidified to form the inter-layer peel ply 18.

The laminate 26 forms the inter-layer peel ply 18 is 13 around round a take-up roller 48.

Subsequently, this postcard stuff 10 is led to a covering material sticking apparatus 50 sticking this covering material 12 to the postcard material 11. At this time, to cover a confidential matter such as a residual amount deposited in a bank which is formed on part of the surface of the postcard with the covering material 12, it is necessary to print proper characters in advance on a proper place, for example, the lower column of the surface of the postcard material 11.

In addition, in the case of making this covering material 12 adhere, for example, to the lower column of the postcard, as shown in Fig. 4, the release sheet 24 is stripped and the postcard material 10 is fed sequentially, and it is folded back at the boundary between the postcard material 11 Dortion and the covering material 12 portion, and the covering material 12 and the postcard material 11 are bonded. Then, the surface of postcard material 10 is pressed by a pressing roller, and the covering material 12 is stuck to the surface of a postcard material 11. Then, the postcard stuff 10 is cut in a proper size, and the postcard of the present invention is formed.

Thus, by adhesion of the postcard material 11, the covering material 12 adheres strongly to the postcard material 11 by the adhesive power of the adhesive layer 22, 14 and the base material 14 adheres weakly thereto by the interlayer peel ply 18. Accordingly, as shown in Fig. 1A and -Fig. 1B, the base material 14 of the covering material 12 can be separated comparatively simply from the postcard material 11.

Although in the aforementioned embodiment continuous paper in roll form was selected as the postcard stuff 10, it may as well be separated in sheet form.

The surface of the base material 14 may be printed in a mode suited for the postcard stuff 10, and when the base material 14, inter-layer peel ply 18 and synthetic resin layer 20 are formed to be continuous, marks for checking the feeding pitch of the covering material 12 such as black arrows may be printed as shown in FIG. 1A.

FIG. 5 is a view showing a postcard as a variation of the aforementioned embodiment.

As shown in FIG. 5, this postcard includes a postcard material 61 and a covering material 62 which is formed integral with the postcard material 61 in a manner of extending from one end thereof and is stuck to the surface of the postcard material 61, and the covering material 62 includes a base material 64, lottery part 66, inter-layer peel ply 68, transparent synthetic resin layer 70 and adhesive layer 72.

In this covering material 62, a part of the synthetic resin layer 70 is spotly stuck directly to the base material is 64, as shown in FIG. 6.

Hence, where the interlayer peel ply 68 is not formed, the base material 64 is stuck to the synthetic resin layer 70 relatively strongly so that there is little risk of the base material 64 being accidentally peeled off the synthetic resin layer 70 even where the inter-layer peel ply 68 is present.

Now, described below is the method of manufacturing the covering material 62 illustrated in FIG. 5, referring mainly to FIG. 7 and FIG. 8.

FIG. 7 is an illustrative view showing an example of manufacturing equipment for a laminate 76 formed by laminating the base material 64, inter-layer peel ply 68 and synthetic resin layer 70.

The illustrated manufacturing equipment 80 for this laminate 76 includes a holding roller 82 for holding the postcard material 60 which is formed integral with the base material 64 in roll form. The postcard stuff 60 held by the holding roller 82 has one end thereof pulled out and this end is led into an inter-layer release agent coating unit 84.

This inter-layer release agent coating unit 84 is for printing or coating the surface of the base material 64 of the postcard stuff 60 with an inter-layer release agent 68a such as wax, and includes two rollers 86a and 86b.

The roller 86a has its lower part kept dipped in the inter-layer release agent 68a in a pan. Hence, when 16 the rollers 86a and 86b are revolved, the surface of the base material 64 being led therebetween is printerd or coated with the inter-layer release agent 68a except for spots.

As the inter-layer release agent coating unit 84 may as well be used a coating machine of some other type or a known printing machine such as offset printing machine or screen printing machine.

The postcard stuff 60 printed or coated with this inter-layer release agent 68a is then led through a drying unit 88 for solidification of the inter-layer release agent 68a.

The laminate with the inter-layer release agent 68a solidified on its surface in the drying unit 88 is then led through a synthetic resin coating unit 90 for formation of a transparent synthetic resin layer 70 thereon.

In this synthetic resin coating unit 90, the surface of the inter-layer peel ply 68 of a proper thickness formed by solidification of the aforementioned inter-layer release agent 68a is printed or coated with a synthetic resin agent 70a for formation of a synthetic resin layer 70 thereon.

The laminate 76 coated with the synthetic resin agent 70a in this synthetic resin coating unit is properly wound up in roll form after solidification of the synthetic 17 resin agent 70a.

And the laminate 76 wound up in roll form as shown in FIG. 8 is then loaded in a laminating unit 94 for formation of an adhesive layer 72.

In this laminating unit 94 a release sheet 74 is loaded in roll form, one end thereof is pulled out and is led into an adhesive coating unit 96 for having the surface of the release sheet 74 printed or coated with an adhesive 72a such as an adhesive of the pressure sensitive type.

The adhesive coating unit 96 includes two rollers 98a and 98b.

The roller 98b has its lower part kept dipped in the adhesive 72a in the bottom portion of a pan 98c. Hence when the rollers 98a and 98b are revolved, the surface of the release sheet 74 is printed or coated with the adhesive 72a. As this adhesive coating unit 96 may as well be used a coating machine of some other type or a printing machine of a known type such as offset printing machine or screen printing machine.

The release sheet 74 thus printed or coated with the adhesive 72a is then led through a drying unit 100 including, for example, a heater. In the drying unit 100, the adhesive 72a applied to the surface of the release sheet 74 by printing or coating is dried to form the adhesive layer 72. The release sheet 74 with the adhesive layer 72 formed 18 thereon is led into a laminating unit 102.

Meanwhile, the aforementioned laminate 76 is held in roll form on a separate holding roller 104, one end thereof is pulled out and this end is led into the laminating unit 102. The laminating unit 102 includes two rollers 106a and 106b. Between these two rollers 106a and 106b, the laminate of the release sheet 74 and the adhesive layer 72 is passed through together with the laminate 76 so that the synthetic resin layer 70 of the laminate 76 is stuck to and laminated on the adhesive layer 72. When these rollers 106a and 106b are revolved, the laminate of the adhesive layer 72 et cetra and the synthetic resin layer 70 of the laminate 76 passing therethrough are stuck together and the covering material 62 is formed thereby.

The covering material 62 formed is wound round a takeup roller 110 to be kept in roll form.

And it is folded back at the boundary between the postcard material 61 portion and the covering material 62 portion, and the covering material 62 and the postcard material 61 are bonded. In addition, by pressing the surface of postcard stuff 10 by a pressing roller, the covering material 62 is stuck to the surface of the postcard material 61. Then, the postcard stuff 60 is cut in a proper size, and the postcard of the present invention is formed.

FIG. 9A and FIG. 9B are perspective views showing 19 another embodiment, and FIG.10A and FIG.10B are sectional views of the embodiment shown in FIG. 9A.

FIG 9A and FIG. 10A are views showing the original state, and FIG. 9B and FIG. 10B are views showing the released state.

In this embodiment, cuts 128a and 128b are made in a covering naterial 122 stuck to the postcard material 121, where the inter-layer peel ply 126 is formed, continuously from one end to the other end in parallel and in relative proximity in the vicinity of the left end of a base material 124 so as to allow parting of the base material 124.

Moreover, tii(:, material 124 between the cuts 128a and 128b is formed sunken to be easily caught by a f inger or nail so that the base material 124 between the cuts 128a and 128b can be parted with ease. Alternatively, a projection may be provided at the fore end of the base material 124 between the cuts 128a and 128b to facilitate picking instead of the aforementioned sinking.

Also, in the vicinity of right edge, a cut 132 for parting is provided so that the covering material 122 peeled off the postcard material 121 can be parted from the part securely stuck by means of the synthetic resin layer 130. In this embodiment a lottery part 136 is provided on the postcard material 121 side to be visible through the synthetic resin layer 130.

These cuts 128a and 128b as well as the cut 132 for parting are formed, when the base material 124 is 'made of paper, along the fiber direction so that the base material 124 can be parted with a relative ease. By the way, in this embodiment, the synthetic resin layer 130 is directly stuck in thevicinities of both edges of the base material 124 lest it should be peeled off accidentally.

FIG. 11 is a sectional view showing another variation of the embodiment shown in FIG.10A, and FIG. 12 is an illustrative view showing the method of manufacturing it.

In this variation, a base material 141 and a synthetic resin layer 142 are strongly stuck together with an adhesive layer 144 in between.

As seen from FIG. 12, the method of manufacturing the postcard of this variation consists of steps of first forming an adhesive layer 144 on the surface of the base material 141 of the postcard stuff 140 by printing or coating with an adhesive of the pressure sensitive type, then peeling off a release paper 146 and having it laminated on the surface of the synthetic resin layer 142.

Fig. 13 is a view showing still another variation, in which a base material 151 and an adhesive layer 152 are directly stuck together to preclude accidental peeling off of the base material 151.

21 In each embodiments, the cuts may be formed along all edges of the base material of the covering material. When the cut:s are formed like that, the center portion of the covering material is peeled off easily. In this case, as shown in FIG. 14, when each cuts are constituted with a linear cut portion and a curvilinear cut portion respectively so as to overlap a part of one cut 224 and a part of the next cut 224 in a direction for peeling the covering material 212, the center portion of the covering material 212 can be peeled off easily. In addition, for peeling off the center portion of the covering material easily, as shown in FIG. 15, for example, each linear cuts 324 may be formed along edges of the basemateria-A- 314 on a slant so as to overlap a part of one cut 324 and a part of the next cut 324 in a direction for peeling off the covering material 312. In these embodiments, the covering material is stuck to cover the whole surface of the postcard material.

In the postcard as shown in FIG. 14 and FIG. 15, by pulling the covering material in the direction as shown by an arrow, the covering material between the adjacent perforations is broken as the direction thereof is shown by an arrow of dash-dot line, and the covering material of the portion encompassed by the perforation is peeled off.

The present invention, preferred embodiments thereof, having thus been described and illustrated in detail, it is 22 to be understood that such description and illustration made above are solely for the purpose of explanation and are by no means limitation, and the spirit and scope of the resent invention is limited only by the appended claims.

Claims

WHAT IS CLAIMED IS:

1. A postcard comprising:

postcard material; and sticking material which is formed integral with said postcard material and is stuck to at least a part of said postcard material in a folded- back fashion said sticking material comprising: a base material opaque at least partly; an inter-layer peel ply formed on the principal surface of said base material; a synthetic resin layer formed on the principal surface of said inter-layer peel ply-, being transparent at least partly; and an adhesive layer formed on the principal surface of said synthetic resin layer, being transparent in the part corresponding to the transparent part of said synthetic resin layer.

2. A postcard in accordance with claiiAi 1, wherein said sticking material is stuck to cover the whole surface of said postcard material.

3. A postcard in accordance with claim 1 wherein said base material has a suppression layer formed on the principal furface of the side on which said inter-layer peel ply is formed.

4, A postcard in accordance with claim 24 1, wherein saidinter-layer peel ply is formed by printing or coating with a wax.

5. A method of manufacturing a postcard comprising a process of preparing a postcard stuff comprising a postcard material and a base material which is formed integral with said postcard material, and stuck to at least part of said postcard material in a folded-back fashion; a process of manufacturing a sticking material comprising the following steps (A) to (D), namely (A) a step of preparing a synthetic resin film or sheetfor forming a synthetic resin layer transparent at least partly on one principal surface of the base material; (B) a step of forming on one principal surface of said synthetic resin film or sheet an adhesive layer transparent in the part corresponding to the transparent part of said synthetic resin film or sheet; (C) a step of printing or coating an inter-layer release agent on one principal surface of said base material or said synthetic resin film or sheet; (D) a step of forming an inter-layer peel ply between said base material and said synthetic resin film or sheet by laminating said synthetic resin film or sheet on said base material using said inter-layer release agent; and a step of sticking said sticking material with its adhesive layer on the principal surface of said postcard material in a folded-back fashion.

6. A method of m anuf acturing a postcard in accordance with claim 5, wherein said picture lines on said postcard material represent secret information printed or coated.

7. A method of manufacturing a postcard in accordance with claim 5, wherein a step of preparing said base material with a suppression layer formed on one principal surface thereof is included.

8. A method of manufacturing a postcard in accordance with claim 5, wherein said inter-layer relase agent is a wax.

9. A method of manufacturing a postcard comprising a process of preparing a postcard stuff comprising a postcard material and a base material which is formed integral with said postcard material, and stuck to at least part of said postcard material in a folded-back fashion; a process of manufacturing a sticking material comprising the following steps (A) to (C), namely (A) a step of forming an inter-layer peel ply by printing or coating a inter-layer release agent on the princiapl surface of said base material; (B) a step of forming a synthetic resin layer transparent at least partly by printing or coating a synthetic resin agent on the principal surface of said 26 inner-laver peel ply; (C) a step of forming an adhesive layer on -the surface of said synthetic resin layer said adhesive layer being transparent in the part corresponding to the transparent part of said synthetic resin layer; and a step of sticking said sticking material with said adhesive layer on the principal surface of said postcard material in a folded-back fashion.

10. A method of manufacturing a postcard in accordance with claim 9, wherein said picture lines on said postcard material are formed by printing or coating a secret information.

11. A method of manufacturing a postcard in accordance with claim 9, wherein a step of preparing said base material with a supression layer formed on one principal surface thereof.

12. A method of manufacturing a post card in accordance with claim 9, wherein said inter-layer release agent is a wax.

27 Published 1990 atThe Patent Office, State House. 86.71 High Holborn, London WC1R 4TP. Further copies maybe obtainedfrom The PatentOffice. Sales Branch, St Mary Cray. Orpington. Kent BR5 3RD. Printed by Multiplex techniques ltd, St Mary Cray, Kent, Con. 1187