JPH0811468A - Hiding information-holding body and its production - Google Patents

Abstract

PURPOSE:To make a printed part visible and print hiding information on an adhesive layer without deteriorating a bonding function of the adhesive layer by a method wherein after printing is made, the adhesive layer having releasability and transparency is provided on the printed surface. CONSTITUTION:Process printing 2 and shading printing 2' are made on the top and rear surfaces of a substrate sheet 1 including lap surfaces. On the lap surfaces of the substrate sheet 1, a releasable and transparent adhesive layer 3 is provided by using an adhesive applicator. On the surface of the adhesive layer 3, printing 4 of hiding information is made using a non-impact printer or the like. Thereafter, the sheet is folded in a Z shape along dotted lines 5 to be lapped at the lap surfaces thereof, and predetermined conditions, such as pressurizing and heating, are imparted to the sheet by a sealer in accordance with properties of the adhesive in use to activate the adhesive 3 to bond the lap surfaces. In this manner, a postcard folded in three is formed, in which a printed part is visible and hiding information can be printed on the adhesive layer without deterioration of a bonding function of the adhesive layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base sheet that can be peelably adhered in various stacking modes, such as double-folding, tri-folding, cutting and stacking, or stacking separate members, and concealing the stacking surface. Possession of hidden information such as postcards, notices, various forms, various cards, etc. that have information that should be displayed (hereinafter referred to as concealed information) and have a double-sided surface that can be temporarily adhered but easily peeled off when necessary Regarding the body, more specifically, on the superposed surface of the base sheet, printing such as process printing, solid printing, or tint block printing is performed in advance, and further, a peelable and transparent adhesive layer is provided on the printed surface, The present invention relates to a concealment information holder characterized in that concealment information is printed on the surface of the adhesive layer, and a method for producing the same.

[0002]

2. Description of the Related Art Concealed information carriers of this type have been conventionally provided with a non-peelable adhesive base on a superposed surface of a base sheet, as disclosed in, for example, JP-A-4-59395. In some cases, a layer of an adhesive composition comprising a fine particle filler having a non-affinity for the adhesive base is provided. However, in the conventional one, a peelable adhesive layer is first provided on a predetermined portion of the superposed surface of the base sheet which is not printed, and then the concealment information is printed on the adhesive layer surface. Thus, the peelable adhesive layer is not provided on the base sheet on which printing has been performed in advance, and the print information is not provided thereon.

On the other hand, recently, with the increasing use of needs such as direct mail, in this type of hidden information carrier, a lot of process printing, solid printing or tint block printing is performed on the superposed surface of the base sheet. The need for area printing is increasing. However, when printing such as process printing, solid printing, or tint block printing is performed on the superposed surface of the base sheet, such printing is usually performed on almost the entire superposed surface, and Since printing is performed on the adhesive layer surface that has already been provided, instead of printing directly, when most of the overlay surface is printed, most of the adhesive layer surface is covered with ink. However, there was a problem that the adhesive function was hindered.

Further, in this type of hidden information carrier, an adhesive layer is provided on the surface of a preprinted base sheet, for example, as disclosed in Japanese Utility Model Laid-Open No. 57-147069.
Although there is disclosed a technique in which a main body paper (corresponding to a base sheet) is preliminarily printed and an adhesive layer is provided on this surface, in this method, a main body paper coated with an ordinary non-peelable adhesive and a synthetic resin are used. It is necessary to combine it with a peelable paper coated with, and as a result, there are drawbacks that the number of constituent requirements increases and the manufacturing process becomes complicated. Moreover, in this product, no further printing was performed on the adhesive layer.

[0005]

Therefore, the present invention does not require a complicated adhesive peeling structure such as a synthetic resin on the superposed surface of the base sheet, and the adhesive function of the peelable adhesive layer is not required. An object of the present invention is to provide a concealment information holder capable of printing concealment information on the adhesive layer by performing printing such as process printing, solid printing or tint block printing on the superposed surface of the base sheet without any damage. It is a thing.

[0006]

In the present invention, a method of directly printing on the surface of a base sheet, rather than printing on the surface of an already provided adhesive layer, that is, in general, on the superposed surface of the base sheets, According to the printing method, printing such as process printing, solid printing, or tint block printing is performed, and after the printing is performed, a peelable and transparent adhesive layer is formed on the printed surface of the base sheet. Provided,
By making the adhesive layer capable of receiving ink or toner, the above-mentioned object is achieved.

[0007]

In advance, the superposed surface of the base sheet is subjected to printing such as process printing, solid printing, or tint block printing, and after the printing is performed, the printed surface is peelable and transparent. By providing the adhesive layer having, the printed parts are located under the adhesive layer, and the printed part can be naturally visually recognized by the transparent adhesive layer without any loss of the adhesive function of the adhesive layer. Further, the adhesive layer can receive ink or toner, and the concealment information can be printed on the adhesive layer.

[0008]

The present invention will be described in detail below based on preferred embodiments. The hidden information carrier of the present invention may be folded in two, folded in three, cut or stacked, or stacked with another body.
It can be applied to postcards, notices, various forms, various cards, etc. that have a double-faced surface that can be temporarily adhered but can be easily peeled off in various overlapping modes. As an example of these applications, for example, the creation process in the case of the tri-fold postcard shown in FIG. 1 will be described according to the schematic creation flow shown in FIG. 7. (1) With a conventional printing machine, with conventional printing conditions, As shown in FIG. 4, the process printing 2 and the tint block printing 2'are performed on the front and back surfaces of the base sheet 1 including the overlapping surface. Then, (2) the peelable and transparent adhesive layer 3 is applied to the superposed surface of the substrate sheet 1 thus printed using a conventional adhesive application device.
In these steps, a printing machine having both a printing function and an adhesive applying function may be used, and it is not necessarily a separate step unless the printing and adhesive applying procedures are mixed. Further, (3) the surface of the adhesive layer 3 is printed with concealment information 4 using a non-impact printer or the like in the same manner as in the conventional method, and then (4) the property of the adhesive used is changed. With the corresponding sealer, Z the overlapping surface along the dotted line 5.
After folding and stacking in a letter shape, predetermined conditions such as pressurization and heating are applied to activate and bond the adhesive 3 to form a tri-fold postcard.

In the case of the double-folded postcard shown in FIG. 2 and the partially-folded postcard shown in FIG. 3, the same process as that of the above-mentioned three-fold postcard is performed, as shown in FIGS. The part where the layer 3 is provided is folded along the dotted line 5 and the surfaces of the adhesive layers are overlapped and bonded.

Although the case where the hidden information carrier of the present invention is used as a postcard has been described above as an example, it can be widely applied to various forms, notices, various cards, etc. Depending on the purpose of use, an adhesive layer may be appropriately provided on both the front and back sides, or on the whole or part of the one side, and in order to facilitate peeling after adhesion, it is opposite to the folded part of the sheet. It is also possible to form a step on the base sheets that are superposed at the side end and form a finger hook or the like.

Next, the adhesive composition constituting the adhesive layer of the hidden information carrier of the present invention will be described. The adhesive composition used in the present invention includes a pressure-sensitive adhesive composition, a heat-sensitive adhesive composition, a rewetting adhesive composition, and the like, and an adhesive base suitable for each is used. Is used. These are normal adhesives, and they should not be peeled off once they are adhered, but they can be peeled off by blending this adhesive base with a fine particle filler that has an incompatibility. The adhesive layer formed by coating this has a function of, and is capable of receiving ink or toner,
It has a function of being capable of printing / printing, not normally adhering, and adhering under predetermined conditions, and capable of peeling after adhering so as not to impair the printed information.

Examples of the adhesive base include natural rubber-based, synthetic rubber-based, acrylic pressure-sensitive adhesive, etc., whose coating has transparency.
Conventional pressure-sensitive adhesives that have been conventionally used may be used, but natural rubber latex obtained by graft-copolymerizing styrene and methyl methacrylate on natural rubber is preferable, and this is formed by coating. This is because the adhesive layer formed is not only transparent but also excellent in blocking resistance, heat resistance, abrasion resistance and the like. Incidentally, as the other adhesive base, those which have been conventionally used, and a heat-sensitive or re-wettable adhesive whose coating film has transparency can also be used. For example, a heat-sensitive adhesive base In particular, a vinyl acetate polymer is preferable, and polyvinyl alcohol, polyethylene oxide and the like are preferable as the rewetting adhesive base.

On the other hand, it is preferable that the fine particle filler has a regular particle shape and has a small affinity with the adhesive base because it is necessary to prevent the adhesive layer from hindering the transparency. , For example, various starch-based, synthetic zeolite, fine spherical acrylic resin, fine spherical methacrylic resin, fine spherical polyethylene, calcium carbonate, kaolin, activated clay, spherical alumina, glass powder, shirasu balloon, and the like, these materials, They may be used alone or in combination. However, silica, titanium oxide, zinc oxide, etc., which have been conventionally used for this kind of filler, are added due to their irregular particle shape, which promotes diffuse reflection of light in the adhesive layer and impairs transparency. If not, or even if it is added, the addition amount is preferably 10% by weight or less. still,
Regarding the particle shape of the fine particle filler, the average particle size is preferably in the range of 1 to 50 μm, preferably 10 to 30 μm, and more preferably 15 to 25 μm.

The fine particle filler is a pressure-sensitive adhesive composition,
The heat-sensitive adhesive composition and the rewetting adhesive composition can be blended and used, but the blending ratio is
If it is too small, the blocking resistance and the peelable function of the adhesive layer are impaired, while if it is too large, the transparency and adhesive strength are impaired. Therefore, the pressure-sensitive and rewettable adhesive base is 50 to 300 parts by weight, preferably 100 to 250 parts by weight, and more preferably 150 to 200 parts by weight, based on 100 parts by weight of the adhesive base. Is. In the case of a heat-sensitive adhesive base, the amount is 40 to 100 parts by weight, preferably 55 to 85 parts by weight, and more preferably 65 to 75 parts by weight, based on 100 parts by weight of the adhesive base.

As described above, in the adhesive composition used for the hidden information carrier, it is necessary to appropriately select the compounding ratio of the adhesive base and the fine particle filler to be used according to the application. Further, in the present invention, in order to maintain the adhesive strength and transparency of the adhesive layer, the coating amount of the adhesive composition on the base sheet is 1 to 30 g /
m ² is preferable, 3 to 20 g / m ² is preferable, and 5 to 15 g / m ² is more preferable.

In the following, an embodiment of the present invention is described in which an adhesive layer is provided on almost all of the superposed surfaces of the base sheet and a predetermined printing is applied, and on the other hand, the base sheet provided with the adhesive layer is
A comparative example in which the same printing as that of the example is performed is compared based on the adhesive force on the overlapping surface, blocking resistance, ink setting property, and surface condition, and further detailed description will be made.
The adhesive strength of the adhesive layer, blocking resistance, ink settability, and surface condition were determined as follows. 1. Adhesion force The base sheet is dried with a chiller at a pressure of 100 kg /
After adhesion at cm ² , the peel strength is measured. 2. Blocking resistance The adhesive layer surface of the base sheet and the unprocessed paper surface are brought into contact with each other,
After applying a pressure of 500 kg / cm ² and leaving it at 20 ° C. for 30 minutes, the peel strength is measured. 3. Ink settability While applying a linear pressure of 1 kg / cm, rubbing with a piece of paper the specified printed area on almost the entire overlapping surface, and check the ink settability. 4. Surface condition Sensory test by touching the base sheet with a finger, and 200 to 5
While applying a load of 00 kg / cm ^2, the surface of the adhesive layer is rubbed with a piece of metal to check the falling state of the filler.

A tensile tester Autograph AGS50 (manufactured by Shimadzu Corporation) was used for the measurement of the peel strength.
In addition, each state comparison was evaluated according to the following symbols. ◎ ... excellent, ○ ... good, △ ... possible, × ... impossible

Example 1 To 100 parts of natural rubber latex copolymerized with 10 parts of methyl methacrylate, 5 parts of a Tempel meter tackifier was added to prepare an adhesive base. Then, this adhesive base 100
To 50 parts of wheat starch having an average particle diameter of 17 μm as a fine particle filler to prepare a pressure-sensitive adhesive composition.
Then, this adhesive composition was applied to a substrate sheet (130 kg high-quality paper) that was process-printed using a wire bar so that the application amount was 10 g / m ² , and the oven was used at 100 ° C. for 1 minute. It was dried to give a test sample.

Example 2 A natural rubber prevulcanized with peroxide was used as an adhesive base, and 100 parts of this adhesive base was mixed with 100 parts of wheat starch having an average particle diameter of 17 μm as a fine particle filler. A pressure-sensitive adhesive composition was prepared. Then, a test sample was obtained in the same manner as in Example 1 except that the coating amount of this adhesive composition was 15 g / m ² on a substrate sheet that was process-printed (similar to Example 1). .

Example 3 A commercially available pressure-sensitive adhesive (TS1033 / made by Nippon Carbide) was used as an adhesive base, and 100 parts of this adhesive base was mixed with 200 parts of wheat starch having an average particle diameter of 17 μm as a fine particle filler. A pressure sensitive adhesive composition was prepared. Then, a test sample was obtained in the same manner as in Example 1 except that the coating amount of this adhesive composition was 20 g / m ² on a substrate sheet that was process-printed (similar to Example 1). .

Example 4 Using a commercially available pressure-sensitive adhesive (Movinyl 460 / Hoechst Synthetic) as an adhesive base, 100 parts of this adhesive base was mixed with 75 parts of wheat starch having an average particle diameter of 17 μm as a fine particle filler. To prepare a pressure sensitive adhesive composition. Then, the adhesive composition was applied to a solid-printed base sheet (Example 1).
A test sample was obtained in the same manner as in Example 1 except that the coating amount was 10 g / m ² .

Example 5 A commercially available adhesive (AE200 / made by Japan Synthetic Rubber) was used as an adhesive base, and 100 parts of this adhesive base was mixed with 20 parts of wheat starch having an average particle diameter of 17 μm as a fine particle filler. To prepare a pressure sensitive adhesive composition. Then, a test sample was obtained in the same manner as in Example 1 except that the coating amount of this adhesive composition was 5 g / m ² on a base sheet printed with a tint block (same as in Example 1). .

In Comparative Examples 1 to 5, corresponding to the numbers, in each of Examples 1 to 5, after the adhesive layer was provided, the same printing as in Example was performed. And
The results of these comparisons are shown in Table 1.

[0024]

[Table 1]

In the example and the comparative example, the adhesive force of the adhesive layer is particularly different, and further, the blocking resistance and the surface condition are also different. Regarding the settability of the ink, in the comparative example, there was a problem that the adhesion of the ink provided before the ink impeded the permeation of the ink and caused printing stains.

Next, using the test sample subjected to the process printing of Example 1, the process printing applied to the surface of the base sheet was performed before and after providing the adhesive layer with a Photovoltaic reflectometer (Toyo Seiki Seisakusho Co., Ltd.). Manufactured), the reflectance of the printed portion was measured using two types of filters, the transparency of the adhesive layer was evaluated, and the results are shown in Table 2.

[0027]

[Table 2]

As the results show, no change in the reflectance of the printed portion was observed before and after the adhesive layer was provided, indicating that the adhesive layer has excellent transparency. The degree of transparency can be arbitrarily adjusted by adding a fine particle filler that impairs transparency, depending on the purpose of use, the function, the design, etc. of various types of hidden information carriers.

[0029]

As is apparent from the above results, according to the present invention, the process printing by the ordinary printing method is directly performed on the overlapping surface of the base sheet of the hidden information carrier in advance.
Printing such as solid printing or tint block printing is performed, and after the printing is performed, by providing a peelable and transparent adhesive layer on the printed surface, those printed parts are bonded. Those located below the layer, without any loss of the adhesive function of the adhesive layer, and by virtue of the transparent adhesive layer, those printed parts can be visually recognized, and the adhesive layer can accept ink or toner. In addition, the concealment information can be printed on the adhesive layer.

[Brief description of drawings]

FIG. 1

FIG. 3 is a perspective view showing a concealed information carrier of the present invention which is a different form of a postcard system having confidentiality and in which a superposed surface is partially peeled off. And

FIG. 4

FIG. 6 shows

FIG. 1

FIG. 3 is a developed sectional view of a base sheet forming each of the concealed information carriers of the present invention. Also,

FIG. 7 is a schematic creation flow chart of a hidden information carrier according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Substrate sheet 2, 2 '... Printing part for process printing, solid printing, tint block printing, etc. 3 ... Adhesive layer 4 ... Hiding information printing part 5 ... Folding line (1) ... Process printing on superposed surface of base sheet, Steps of printing such as solid printing or tint block printing (2) Step of providing a peelable and transparent adhesive layer (3) Step of printing concealment information on the adhesive layer (4) Process to bond

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area C09J 7/02 JKZ JLJ

Claims (3)

[Claims] 1. A base sheet having an adhesive layer which is not normally adhered and which can be adhered under a predetermined condition and which can be peeled off after adhering and which has transparency, is folded in two or three, Cutting and stacking, or stacking different comrades,
A hidden information carrier in various superposed modes, wherein the superposed surface of the base sheet is subjected to printing such as process printing, solid printing, or tint block printing, and further, on the printed surface, A concealment information carrier, comprising the peelable and transparent adhesive layer, and concealment information printed on the adhesive layer. 2. The peelable and transparent adhesive layer is composed of an adhesive composition composed of a non-peeling adhesive base and a fine particle filler having an incompatibility with the adhesive base. The method for producing a hidden information carrier according to claim 1, characterized in that the ink and the toner can be received. 3. A base sheet, which is not normally bonded, can be bonded when a predetermined condition is given, can be peeled after bonding, and has a transparent adhesive layer, is folded in two, folded in three, and cut. A method for producing a hidden information carrier in various superimposing modes such as superimposing or superimposing one another, including (1) process printing, solid printing, or tint block printing on the superimposing surface of the base sheet. Printing such as printing, (2) providing the peelable and transparent adhesive layer on the printed surface of the printed base sheet, and (3) printing concealment information on the adhesive layer surface. And the process of
(4) The base sheets are superposed on each other, and the superposing surfaces are brought into contact with each other, and predetermined conditions such as pressurization and heating are applied thereto to activate the peelable and transparent adhesive, and the superposition is performed. A method for producing a hidden information carrier, comprising the step of adhering two faces together.