JP2000085270A - Sealed printed article which can be unsealed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a trouble wherein a picture pattern is transferred to other surfaces when a sealed portion of a printed article is unsealed from being generated by providing a covering layer comprising a thermoplastic resin between a base material sheet for printing and a printed pattern, or on the total surface of the base material sheet for printing including the printed pattern, or on both of them. SOLUTION: A laminated body A is constituted by laminating a second printing pattern P2 and a re-peelable adhesive layer 2 on each sheet 1 wherein a first printing pattern and a thermoplastic resin layer are provided on a base material sheet for printing, and two sheets of the laminated bodies A and A' are laminated in such a manner that the adhesive layers 2 and 2' may come into contact with each other, and a sealed printed article is obtained. For the thermoplastic resin on the surface of the base material sheet, one having a glass transition point which is at a room temperature or higher is used, and as the thermoplastic resin, a polyurethane resin, an acrylic resin or a vinyl acetate copolymer resin can be counted. By this constitution, the bondability of a printing ink is improved, and at the same time, the smoothness and the printing precision of a printed surface are improved, and a clear printing with a favorable reproductivity is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for applying a releasable adhesive to a surface of a printing base sheet such as paper and then printing, or applying a releasable adhesive after printing. By bending and pressing with the printing substrate sheet outside, the printed information can be prevented from being exposed to the eyes of a third party, and when necessary, the printed information is not damaged. And a sealed printed matter which can be opened.

[0002]

2. Description of the Related Art Conventionally, in order to keep a part or all of printed characters and pictures (collectively referred to as a printed pattern) confidential, a re-peelable sticker is applied. Or, fold the sheet in two to make the printed pattern surfaces come in contact with each other, pressurize and glue them with a removable adhesive between them, and seal them so that they do not inadvertently be seen by a third party There is a printed matter. Examples of the use of such printed materials include notification of information on deposits and pensions, trading reports issued by securities companies, bills issued by credit card companies, notification of personal identification numbers, lottery lottery, etc. , Personal information, and different information each time,
It is output to a continuous form from a computer terminal or the like, then cut or separated by perforation, used after folding and bonding, or mailed in the form of a postcard or the like. In addition, the information that requires confidentiality includes information that does not differ from individual to individual, such as information to be sent only to qualified persons, such as addressed to members of a specific society, and information to be notified only to certain qualified persons. . In short, this type of printed matter is used when a side that transmits information or a side that receives information desires to keep information confidential to a third party.

Incidentally, even in this type of printed matter, common printing is sometimes performed in advance in order to enhance the appearance and enrich the contents. However, recently, since individualized printing is demanded as much as possible according to the other party, even if it is common, there are times when printing is performed in some ways. Printing ".

[0004] Regarding these common printings, there has been a problem that the adhesion between the printing base sheet and the printed pattern is not sufficient. Usually, the printing base sheet in this type of printed matter is paper, and lithographic offset printing using a blanket (this method is usually referred to as offset printing) is used to apply a fine print pattern to the paper. It is common to do. In this lithographic offset printing, the printing pattern ink on the plate is temporarily transferred to a blanket and then transferred to paper. If the ink adhesion is too high, the blanket is transferred from the blanket to paper. As a result of insufficient transfer of ink, the ink remains on the planket, resulting in a decrease in printing durability (= printable number) and a background stain on printing (= thin ink adheres to places where ink should not originally adhere) Phenomenon). In order to avoid these drawbacks, the ink for offset printing does not have much higher adhesion to the printing object than the inks of other printing types such as letterpress and gravure.

[0005] If the adhesion of the ink is not so high, after printing, (1) a re-peelable adhesive is applied and then printed, or (2) re-peelable after printing. An adhesive is applied, and in either case (1) or (2), the printed material is bent and pressed with the printing substrate sheet side outside, and the insides are adhered and sealed. Is transferred from the first printed surface to the other surface, which makes it difficult to read when it is unsightly or severe. Further, in order to completely perform the adhesion and the re-peeling, it is necessary to increase the applied amount of the adhesive. However, an increase in the applied amount of the adhesive causes a problem of blocking. "Table 1" shows the conventional disadvantages, and shows that even if the amount of the adhesive applied is changed and the printing substrate is changed, the transfer of the ink occurs and the gloss is not sufficient.

[0006]

[Table 1]

[0007] In the above "Table 1" and the following "Table 3" to "Table 6," the evaluation method is as shown in the following "Table 2."

[0008]

[Table 2]

[0009]

According to the present invention, in the conventional technique described above, when the seal portion of the printed matter is opened, a part of the common picture pattern which has been printed is firstly printed on the first printing surface. It is an object of the present invention to provide a printed material that avoids the drawback of transferring from the surface to another surface and the drawback that blocking occurs when the amount of adhesive applied is increased.

[0010]

According to the present invention, heat is applied to either or both of the printing substrate sheet and the printing pattern, or the entire surface of the printing substrate sheet including the printing pattern. The above problem was solved by the presence of a coating layer made of a plastic resin.

[0011] The first aspect of the present invention is that a first printing pattern is laminated on a printing base sheet, and the printing pattern including the printing pattern is provided between the printing base sheet and the printing pattern. A coating layer of a thermoplastic resin is laminated on the surface of the base material sheet, and further thereon, a print sheet having a structure in which a removable adhesive layer and a second print pattern are laminated in the described or reversed order, The present invention relates to an openable sealed print, wherein the adhesive is attached with the removable adhesive layer side inside. The invention of claim 2 is
The method according to claim 1, wherein the glass transition temperature of the thermoplastic resin is equal to or higher than room temperature. According to a third aspect of the present invention, in the first aspect, the coating layer contains an extender. According to a fourth aspect of the present invention, in the first aspect, the thermoplastic resin is a polyurethane resin, an acrylic resin, or a vinyl acetate copolymer resin, or a combination of two or more kinds. . The invention of claim 5 is the invention of claim 1
Wherein the thermoplastic resin is cross-linked by a cross-linking agent. The invention of claim 6 is
The method according to claim 1, wherein the thickness of the coating layer is 0.5 to 10 μm.
m.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 schematically shows the overall structure. Sheet 1 and sheet 1 ′ each have a printing substrate sheet provided with a first printed pattern and a thermoplastic resin layer as a single layer. Details of the sheets 1 and 1 'will be described later with reference to FIGS. On the sheet 1 and the sheet 1 ', the second printed patterns P2 and P2' and the releasable adhesive layers 2 and 2 'are laminated to form laminates A and A'. The bodies A and A 'are laminated such that the adhesive layer 2 and the adhesive layer 2' are in contact with each other. Here, the print pattern P2 and the removable adhesive layer 2 or the print pattern P
The order of lamination is changed between 2 ′ and the removable adhesive layer 2 ′. First, on the sheets 1 and 1 ′, the removable adhesive layers 2 and 2 ′ are laminated, and Print pattern P2, P
2 ′ may be laminated. Printed patterns are represented by dots or lines if they are characters, and if they are photographs or pictures, they are composed of dots. This is because it may be possible to bond through an adhesive surface or a dot-like or linear ink film.

The laminate A and the laminate A ′ in FIG. 1 are originally a part of a single laminate, and should be folded and bonded so that the adhesive layer is on the inside, and laminated. It is also easy to manufacture. However, in the case where the materials are changed from each other, or one of them is formed and pasted in a relatively small thin label shape, the laminate A and the laminate A ′ may be separate bodies. The laminate A and the laminate A ′ may have the same size as each other, or may have different sizes.

FIGS. 2 to 4 show the laminated structure of the sheet 1 or 1 'in the laminate A or A'. In the description of FIGS. 2 to 4, the sheets 1 and 1 'are the same. , 1. In FIG. 2, a thermoplastic resin layer 4 is laminated on the front surface of the printing base sheet 3,
Further, the sheet 1 in a state where the printed pattern P1 is laminated thereon is shown. With such a structure, the object to be directly printed is the thermoplastic resin layer 4 instead of the printing base sheet 3, and thus, of course, the adhesiveness of the printing ink is improved. Since the surface smoothness is improved, printing accuracy is also improved, and clear printing with good reproducibility can be performed. In addition, as a result of the improvement of the gloss as a whole with the improvement of the smoothness, a brighter and more transparent print can be obtained. In FIG. 2 and subsequent FIGS. 3 and 4, a dashed line at the center indicates a case where a releasable adhesive layer or a second printed pattern is further provided on the laminated body 1 and folded inside. Shows fold lines.

FIG. 3 shows the laminate 1 in a state in which a printed pattern P1 is laminated on the front side surface of the printing base sheet 3 and a thermoplastic resin layer 4 is laminated thereon. FIG.
, The printed pattern P1 and the thermoplastic resin layer 4
The stacking order of has been changed. By adopting such a structure, even if the adhesiveness of the printing ink is not very good, the printed pattern P1 is not exposed on the surface, so that the printed pattern P1 can be prevented from falling off and the thermoplastic resin layer 4 can be used as a substrate for printing. The close contact with the sheet 3 enhances the adhesion of the print pattern P1 to the printing base sheet 3 and improves the gloss with the improvement in smoothness, resulting in a brighter and more transparent feeling. Printing is obtained.

FIG. 4 shows that a first thermoplastic resin layer 4a is firstly laminated on the front surface of the printing substrate sheet 3, a printing pattern P1 is laminated thereon, and finally a second thermoplastic resin layer 4a is laminated. It shows the laminate A in a state where the thermoplastic resin layers 4b are laminated. The thermoplastic resins constituting the layers 4a and 4b may be the same or different. With such a structure, as in the case of the laminate shown in FIG. 2, the adhesiveness of the printing ink is improved, the printing accuracy is improved, and reproducible, clear printing can be performed. In addition, since the printed pattern P1 is not exposed on the surface and the thermoplastic resin layer 4b covers the entire surface, the adhesion of the printed pattern P1 to the printing base sheet is increased. Is not so good, it is possible to prevent the printed pattern P1 from falling off. In addition, since two thermoplastic resin layers are provided, the smoothness is improved as compared with the case where only one layer is provided, and this causes an improvement in gloss, so that a brighter and more transparent print can be obtained. Can be

The printed matter of the present invention is applicable to various uses. 5 and 6 show an example applied to a postcard as an example. In addition, in the case of postcards, it is required to be bonded together according to the provisions of the postal law, etc.When bonding, the adhesive is applied to the entire bonding surface, If no restriction is imposed, the adhesive may be applied only to a part of the periphery or the like, for example, only to the peripheral edge part. In FIG. 5, the horizontally long sheet 11 has areas 12, 13, and 14 each having the size of a vertically placed postcard via folding lines 15 and 16. Here, the sheet 11 can have various laminated structures shown in FIGS. 2 to 4, and is usually appropriately printed. For example, according to the example of FIG. 2, a thermoplastic resin layer is provided on the entire front and back surfaces before printing. Information to be concealed is printed on the front side of the areas 12 and 13 and the back side of the areas 13 and 14, and information on the address of the delivery destination is printed on the front side of the area 14. In addition, the back side of the area 12
In the folding method which will be described below, since it remains exposed, information that does not need to be concealed is printed. Then, on the printed surface, a re-peelable adhesive layer is formed on at least the entire back side of the areas 13 and 14 and the area 12.
And 13 are provided on the entire front side.

The sheet 11 shown in FIG.
By folding inward along line 5 and then outward along folding line 16 and pressing the whole, the front sides of sections 12 and 13 and the backside of sections 13 and 14 adhere to each other, 6, one postcard 21 is obtained. FIG. 6
Here, in order to make it easier to understand the state of being folded and attached, the sections 12, 13, and 14 are shown as being folded just before bonding. In this example, the sheets are folded and stuck together to keep the information confidential on the front sides of the areas 12 and 13 and on the back sides of the areas 13 and 14 until they are opened, despite the size of the postcard. It is suitable for mailing as it is.

In the above example, the horizontally long sheet is zigzag folded twice along the vertical folding line. However, the vertically long sheet may be folded along the horizontal folding line. Instead of zigzag folding, winding folding (a method of repeating one of inner folding and outer folding several times) may be used. Further, the dimensions may be made large and the number of times of folding may be increased. Alternatively, place the postcard vertically and use 4
A sheet of the same size as the arranged sheets is divided by three equally-spaced vertical fold lines, first folded inward along the two fold lines on both sides, and then along the center fold line You can also fold inside.

In any case, a removable adhesive layer is provided at a place where information should be sealed during mailing,
Keep sealed. Regarding the size of the sheet before folding,
There is no particular limitation, but if the size is too large, the number of times of folding will be large, and the folded part will be thick, making it difficult to fold.Since the simple image of the postcard, there is also a notion that it is not suitable for sending too much information Therefore, eight postcards is a tentative upper limit. Of course, the number may be further increased as necessary. Further, as described in the description with reference to FIG. 1, it is easier to handle and it is more practical to use a continuous sheet having an area several times larger than the postcard, but the dimensions of the postcard itself are high. It is also possible to combine different sheets that are not as large or about twice or three times as large as a postcard. In this way, sheets of different materials and sheets with different processing contents are combined. be able to.

In addition to the above examples, the present invention can also be suitably used for distribution slip labels (= slip and delivery slips mainly attached to small cargoes etc. delivered to individuals), secret labels, clean release cards, etc. for distribution. .

The present invention is suitable for a material whose printing suitability is not always good. As a printing substrate, paper such as high-quality paper, recycled paper, copy paper, recording paper such as pressure-sensitive copy paper, heat-sensitive recording paper, etc. Are suitable. However, since there are many materials whose printability is improved by providing a thermoplastic resin layer, paper other than these can be used. The printing substrate may be other than paper, and suitable are those having a plastic film on the surface, such as a foamed polyethylene terephthalate resin film, polyethylene-laminated paper, and a polypropylene film.

It is important that the resin constituting the thermoplastic resin layer, which is the point of the present invention, does not cause blocking. For this purpose, it is necessary that the glass transition temperature is equal to or higher than room temperature (here, room temperature is set to 25 ° C.). Table 3 shows an example in which resins having different glass transition temperatures were used and the blocking resistance was compared.

[0024]

[Table 3]

If the coating amount is large, the solvent inside hardly volatilizes, drying becomes difficult, and blocking is easy. Therefore, the coating amount is preferably adjusted so that the thickness of the ink film is about 0.5 to 10 μm. . "Table 4" shows the change when the application amount is changed.

[0026]

[Table 4]

In order to prevent blocking, it is better to add an extender such as silica or amina rather than using the resin alone. The likelihood of occurrence of blocking varies depending on the amount of application, and therefore, it is difficult to say that the amount of the extender pigment is very small. It is about. Table 5 shows the change in performance when the extender was added.

[0028]

[Table 5]

It is preferable to use a resin constituting the thermoplastic resin layer, since the transfer of ink when the seal portion is opened is further eliminated if a crosslinking agent is blended and crosslinked. Although there is a case where it is practically unnecessary to use the transfer, the transfer may be promoted by the processing conditions, the environmental temperature, the pressure at the time of mail deposition, and the like. The amount of the cross-linking agent added is represented by the weight ratio of the resin and the cross-linking agent, ie, resin / cross-linking agent = 99/1 to 70/1
It is about 0. "Table 6" shows the effect of changing the paper by applying the crosslinking agent.

[0030]

[Table 6]

In the present invention, a re-peelable material is always used as the adhesive layer. However, when there are a plurality of places to be bonded, one or more of the places are strongly adhered and cannot be re-peeled. The adhesive may be replaced with an adhesive, for example, a return postcard portion may be formed by laminating two sheets and increasing the thickness.

[0032]

According to the first aspect of the present invention, the printing substrate has a thermoplastic resin layer on one or both of its surface and a printing pattern surface provided on the surface of the printing substrate. As a result, transfer and blocking of the pattern can be prevented.
According to the invention of claims 2 to 6, the glass transition temperature of the thermoplastic resin is set to room temperature or higher, the extender is added to the thermoplastic resin, the thermoplastic resin is a polyurethane resin, That the resin is cross-linked with a cross-linking agent,
Alternatively, since the thickness of the thermoplastic resin layer is set to 0.5 to 10 μm, transfer and blocking of a picture pattern can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a printed matter of the present invention.

FIG. 2 is a sectional view of a printing substrate according to the present invention.

FIG. 3 is a sectional view of a printing substrate according to the present invention.

FIG. 4 is a sectional view of a printing substrate according to the present invention.

FIG. 5 is a diagram showing an application example of the present invention.

FIG. 6 is a diagram showing an application example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 'sheet 2, 2' removable adhesive layer A laminated body 3 printing base material 4 thermoplastic resin layer 5 printing pattern 11 sheet 12-14 area 15, 16 folding line

Claims (6)

[Claims] 1. A first printing pattern is laminated on a printing base sheet, and a surface of the printing base sheet including the printing pattern between the printing base sheet and the printing pattern. A coating layer made of a thermoplastic resin is laminated, and further thereon, a releasable adhesive layer and a printed sheet having a structure in which the second printed pattern is laminated in the described order or reverse order, the re-peelable Openable sealed printed matter, characterized in that they are bonded together with the adhesive layer side inside. 2. The printed matter according to claim 1, wherein the glass transition temperature of the thermoplastic resin is equal to or higher than room temperature. 3. The printed matter according to claim 1, wherein the coating layer contains an extender pigment. 4. The thermoplastic resin is a polyurethane resin,
2. The printed matter according to claim 1, wherein the printed matter is an acrylic resin or a vinyl acetate copolymer resin or a combination of two or more kinds. 5. The printed matter according to claim 1, wherein the thermoplastic resin is cross-linked by a cross-linking agent. 6. The printed matter according to claim 1, wherein said coating layer has a thickness of 0.5 to 10 μm.