JP2004068232A - Information-recording paper and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide information-recording paper, used as overlapped and attached by pressure and receiving less effect by getting wet with water than conventional paper. <P>SOLUTION: This information-recording paper is characterized by laminating an aqueous emulsion pressure-sensitive adhesive layer 2 not sticking in an usual state but showing a peelable sticking property by compression on at least one side of a paper substrate 1 having temperature dependent water absorbing property. The method for producing the information-recording paper is provided by applying the aqueous emulsion pressure-sensitive adhesive on at least one side of the paper substrate 1 having temperature dependent water absorbing property, impregnating and drying at a higher temperature than the normal temperatures to laminate the aqueous emulsion pressure-sensitive adhesive layer 2 not sticking in the usual state but showing the peelable sticking property by the compression. <P>COPYRIGHT: (C)2004,JPO

Description

表１から明らかなとおり、紙基材１に吸水温度依存性を有するものを採用した本発明の情報記録用紙を使用した圧着ハガキは、優れた耐水性が確認されたが、比較例による圧着ハガキの場合は、水濡れ後の剥離耐性と良好なインキ転移性を同時に満足することが出来ず実用上支障をきたす程度に不十分なものであった。
（実施例２）
この発明の製造方法の他の実施例を、図５〜図９に基づきＺ状の圧着ハガキ（３面折り）の製造例として説明する。
【００５７】
図５乃至図７に示すように、紙基材１（ハガキ用紙）には両面に絵柄等印刷層３（差し出し人名その他の印刷インキ部位）が形成され、その上側に水性エマルジョン感圧接着剤層２が形成され、ハガキ本体部１０と貼付片部１１と圧着添付片部１２が連接してＺ字状に折り畳まれる。
【００５８】
図８及び図９に示すように、巻き取り連続紙５として紙基材１（絵柄等印刷層３は形成済み）を給紙し、エマルジョン感圧接着剤の２つの塗布領域６ａ，６ｂで両面の所定の部分に塗布含浸乾燥してエマルジョン感圧接着剤層２を形成する。
【００５９】
図５に示すように、ハガキをＺ字状に構成する場合、紙基材の表裏両面の圧着面４ａ，４ｂは接着強度の要求度が異なる。圧着後に剥離性が必要である（接着強度が弱い必要がある）のは受け取り人への秘密伝達情報を記録した方の圧着面４ｂであり、情報の印刷・印字がない他方の圧着面４ａは容易に剥離してはいけない（接着強度が強い必要がある）。
【００６０】
この要求を満たすため、この発明では請求項７で特定する製造方法を提供するものである。すなわち、図８及び図９に示したプロセスにおいて、剥離が期待される方のエマルジョン感圧接着剤層２の塗布領域６ａの含浸乾燥温度を、剥離してはいけない他方のエマルジョン感圧接着剤層２の塗布領域６ｂの含浸乾燥温度より高く設定することにより、圧着面４ａと圧着面４ｂの間の接着強度の差を「４ａ＞４ｂ」の関係として任意に制御することができる。
【００６１】
【発明の効果】
この発明は上述のような構成であり、次の効果を有する。
【００６２】
この発明による情報記録用紙及びその製造方法は、吸水温度依存性を有する紙基材を使用しているので、圧着ハガキとした場合、水濡れ後の接着剤層の剥離耐性に優れ、かつインキ転移性のないすぐれた作用効果を奏する。
【図面の簡単な説明】
【図１】この発明の情報記録用紙の実施例１を説明する斜視図。
【図２】図１の情報記録用紙の拡大断面図。
【図３】図１のＶ字状の圧着ハガキ製造装置を説明する工程概略側面図。
【図４】図１のＶ字状の圧着ハガキ製造装置を説明する工程概略正面図。
【図５】この発明の情報記録用紙の実施例２を説明する斜視図。
【図６】図５のＺ字状の圧着ハガキの正面図（折り畳み前）。
【図７】図５のＺ字状の圧着ハガキの背面図（折り畳み前）。
【図８】図５のＺ字状の圧着ハガキ製造装置を説明する工程概略側面図。
【図９】図５のＺ字状の圧着ハガキ製造装置を説明する工程概略正面図。
【符号の説明】
１　紙基材
２　水性エマルジョン感圧接着剤層
３　絵柄等印刷層
４　圧着面[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an information recording paper having a pressure-sensitive adhesive layer which is used for a communication office postcard or an advertisement postcard and which has an adhesive property which does not adhere in a normal state and can be peeled off by pressure, and a method for producing the same. It is.
[0002]
[Prior art]
Conventionally, information recording paper such as postcards for communication clerical work where confidential communication contents such as notices of pension payments and reminder letters of tax unpaid money have been recorded, and advertisement postcards printed with flyer contents such as supermarkets etc. There is.
[0003]
This information recording paper is coated with a pressure-sensitive adhesive layer exhibiting an adhesive property that does not adhere to the paper base in a normal state but can be peeled off by pressing, and general notice contents and pictures are applied to this adhesive layer. Print and, if necessary, further print personal confidential information (payment deadline, etc.), and superimpose the surfaces to be concealed at the time of delivery so that they can be peeled off. Things.
[0004]
Then, when the receiver peels off the adhesive surface of the crimped information recording paper after mailing and opens it, it is possible to confirm general notification contents, personal confidential communication contents, and the like.
[0005]
However, there is a problem in that when the recipient attempts to peel off the paper in a state where the postcard is wet with water, the paper may be scattered from a place where it should not be peeled off. In addition, depending on the general notification contents and the area of printing of a pattern or the like, the adhesive layer thereunder may be masked by the printing layer of the pattern or the like, which may affect the adhesive strength after pressure bonding, and a stable adhesive strength may be obtained. There was also a problem that it was difficult to get.
[0006]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide an information recording sheet which can be used by being superimposed and pressed under pressure to make it less susceptible to the influence of water wettability, and a method of manufacturing the same.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following technical means.
[0008]
{Circle around (1)} In this information recording paper, an aqueous emulsion pressure-sensitive adhesive layer which does not adhere in a normal state and exhibits adhesiveness which can be peeled off by pressure is laminated on at least one surface of a paper base having water absorption temperature dependency. It is characterized by having.
[0009]
Since the paper base material constituting the information recording paper has a water absorption temperature dependency, the following effects are obtained by impregnating and drying the aqueous emulsion pressure-sensitive adhesive at a temperature higher than room temperature in the manufacturing process.
[0010]
That is, the water absorption (permeability of the water-based emulsion pressure-sensitive adhesive) of the paper substrate having the water-absorption temperature dependency during the impregnation and drying of the water-based emulsion pressure-sensitive adhesive at a temperature higher than room temperature was improved, and the water absorption was improved. Ensuring the anchoring property of the aqueous emulsion pressure-sensitive adhesive to the paper base material (meaning that after the water-based emulsion pressure-sensitive adhesive penetrates into the paper equipment, it solidifies to generate the adhesive force between the paper base material and the adhesive) On the other hand, for example, when actually used as a postcard in a town, the room temperature is normal temperature. Therefore, the water absorption of the paper base material having the water absorption temperature dependency is the time when the aqueous emulsion pressure-sensitive adhesive is impregnated and dried (temperature higher than normal temperature). And water can hardly seep into the paper substrate even if it has rain or the like.
[0011]
Here, the water absorption temperature dependency (temperature dependency of the water absorption of the paper substrate) means a property that the water absorption at a high temperature is larger than the water absorption at a normal temperature.
[0012]
The normal temperature generally means about 23 ° C. ± 3 ° C. However, since the temperature fluctuates depending on the season, appropriate measures are taken according to the seasonal temperatures such as summer and winter. That is, the temperature higher than the normal temperature at the time of impregnation drying of the pressure-sensitive adhesive layer can be set to about 40 ° C. when the air temperature is about 23 ° C., for example.
[0013]
As the paper base, for example, a commercially available inkjet paper for a so-called inkjet printer (printing style of a printer for a personal computer) can be used. This ink-jet paper often has a water absorption temperature dependency.
[0014]
When the aqueous emulsion pressure-sensitive adhesive is mainly composed of a rubber-based adhesive, there is an advantage that the adhesiveness by pressure can be more effectively exhibited.
[0015]
As the rubber latex used in the aqueous emulsion pressure-sensitive adhesive, a latex of natural rubber or a modified product thereof, a synthetic rubber, or a mixture of a natural rubber or a modified product thereof and a synthetic rubber can be used. Examples of the modified natural rubber include a grafted natural rubber obtained by graft-polymerizing a natural rubber with styrene, a styrene-butadiene copolymer, an acrylonitrile-butadiene copolymer, an alkyl (meth) acrylate, or the like. Examples of the synthetic rubber include (poly) isoprene rubber, butadiene rubber, styrene-butadiene copolymer rubber, acrylonitrile-butadiene copolymer rubber, ethylene-propylene copolymer rubber, butyl rubber, chloroprene rubber, and acrylic rubber. However, the present invention is not limited to this, and may be used alone or as a mixture of two or more, if necessary. In addition, the pressure-sensitive adhesive layer includes a tackifier such as a rosin-based resin, an adhesion control agent such as a wax or a silicone resin, a pigment such as silica and titanium oxide, a binder such as starches and PVA, and a dispersion agent. Other additives such as an agent and a thickener can be appropriately added as needed.
(2) The aqueous emulsion pressure-sensitive adhesive layer may be impregnated and dried at a temperature higher than room temperature.
[0016]
According to this structure, the function of the first aspect can be surely exhibited.
{Circle around (3)} A water-based emulsion pressure-sensitive adhesive layer may be formed on the upper side of the print layer such as a pattern previously formed on the paper base material.
[0017]
With such a configuration, the aqueous emulsion pressure-sensitive adhesive layer is present on the upper side of the print layer such as a pattern (including the case of only characters), and when the aqueous emulsion pressure-sensitive adhesive layers of the paper base are pressed against each other, Since the aqueous emulsion pressure-sensitive adhesive layer is not masked by the printed layer such as a picture, it is possible to avoid a change in the adhesive force after pressure bonding and to obtain a stable adhesive force.
[0018]
Examples of the method of printing the print layer such as a pattern include offset planographic printing, so-called inkjet printing, and printing with an ink ribbon.
(4) The water absorption temperature dependency may satisfy the following equation.
[0019]
BA ≧ 8 (g / m ² )
(A is the sizing degree at 23 ° C. measured under the condition of a contact time of 10 seconds according to the paper and paperboard-water absorption test method by the Cobb method of JIS P8140, and B is the sizing degree at 40 ° C.)
When a water-based emulsion pressure-sensitive adhesive is applied to a paper substrate and impregnated and dried, a surface temperature of the paper substrate of about 40 ° C. (above) is effective for drying and fixing the water-based emulsion pressure-sensitive adhesive. The high water absorption (size B at 40 ° C.) of the paper base material in the temperature range increases the anchoring property of the water-based emulsion pressure-sensitive adhesive to the paper base material. Water absorption at normal temperature around 23 ° C. (size A at 23 ° C.) is reduced, and paper scum at the time of peeling (between the paper base material and the adhesive layer instead of between the adhesive layers or the surface layer of the paper base material) Is destroyed and peeled off) can be reduced.
[0020]
Here, the high water absorption (size B at 40 ° C.) of the paper base material at about 40 ° C. and the water absorption at room temperature around 23 ° C. (size A at 23 ° C.) are expressed by B−A ≧ 8. By immersing in warm water at 40 ° C. for about 2 seconds, the tensile strength is lost (tensile strength <peel strength), while normal temperature water is 23 ° C. ) Can be peeled even when immersed for about 2 seconds (tensile strength> peeling strength), and surface destruction such as paper dripping at the time of peeling in the rain in the actual use temperature range can be reduced. On the other hand, when B−A <8, the above-described remarkable difference does not occur depending on the amount of water absorption between the normal temperature water and the warm water.
[0021]
As the paper base material satisfying the relationship of B−A ≧ 8, for example, any one of inkjet papers can be used. It should be noted that high-quality paper generally used as this type of postcard often does not satisfy the relationship of BA ≧ 8, and is not suitable as a paper base material.
{Circle over (5)} The method for producing the information recording paper is such that an aqueous emulsion pressure-sensitive adhesive is applied to at least one surface of a paper substrate having a water absorption temperature dependency, and is impregnated and dried at a temperature higher than normal temperature to obtain a normal state. Is characterized by laminating an aqueous emulsion pressure-sensitive adhesive layer exhibiting adhesiveness that can be peeled off by pressure without bonding.
[0022]
When the aqueous emulsion pressure-sensitive adhesive is applied to at least one surface of the paper substrate in the present invention, the entire surface of the paper substrate may be applied, or a part of the surface may be applied. There is no restriction.
[0023]
In the method for producing this information recording paper, an aqueous emulsion pressure-sensitive adhesive is applied to at least one surface of a paper substrate having a water absorption temperature dependency, and is impregnated and dried at a temperature higher than room temperature. Improves the water absorption (permeability of the water-based emulsion pressure-sensitive adhesive) of a paper substrate having a water absorption temperature dependency at the time of impregnation and drying of the water-based emulsion pressure-sensitive adhesive, thereby improving the water-based emulsion feeling on the paper base having improved water absorption. While the anchoring property of the pressure-sensitive adhesive can be ensured, for example, when actually used in a city as a postcard at room temperature, the water absorption of the paper base material having the water absorption temperature dependency is the same as that of the aqueous emulsion pressure-sensitive adhesive. The temperature is lower than that at the time of impregnation and drying (temperature higher than normal temperature), and it is possible to make it difficult for moisture to seep into the paper base material even if it has rain or the like.
[0024]
Here, as a method of applying an aqueous emulsion pressure-sensitive adhesive to a paper substrate and impregnating and drying at a temperature higher than room temperature, for example, applying an aqueous emulsion pressure-sensitive adhesive to the paper substrate at room temperature and applying a temperature higher than room temperature (hot air drying) Impregnated and dried at room temperature), apply an aqueous emulsion pressure-sensitive adhesive to a heated paper base and apply impregnation at a temperature higher than room temperature, or apply a heated aqueous emulsion pressure-sensitive adhesive to a paper base and apply it at room temperature. Aqueous emulsion pressure-sensitive adhesive dried or impregnated at a higher temperature, or coated with a heated aqueous emulsion pressure-sensitive adhesive on a heated paper substrate and dried at a higher temperature than normal temperature or heated on a heated paper substrate And then impregnated and dried at a temperature higher than room temperature (hot air drying room or the like).
{Circle around (6)} After a printed layer such as a pattern is first formed on the paper base material, an aqueous emulsion pressure-sensitive adhesive may be formed above the printed layer such as a pattern.
[0025]
With this configuration, the aqueous emulsion pressure-sensitive adhesive layer is present on the upper side of the pattern or the like printing layer, and when the aqueous emulsion pressure-sensitive adhesive layers of the paper base are pressed against each other, the aqueous emulsion pressure-sensitive adhesive layer is formed by the pattern or the like printing layer. Since the adhesive layer is not masked, it is possible to avoid a change in the adhesive force after the pressure bonding and to obtain a stable adhesive force.
{Circle around (7)} This is a method for producing an information recording sheet which is folded into a substantially Z-shape through a folding portion and used for pressure bonding, wherein an aqueous emulsion pressure-sensitive adhesive is applied to both the front and back surfaces of a paper base material, and is impregnated and dried. By setting the temperature to be different, the adhesive strength after pressure bonding of the pressure-sensitive adhesive layers laminated on the front and back surfaces may be made different.
[0026]
A water-based emulsion pressure-sensitive adhesive is formed on both the front and back surfaces of a paper base material (for example, a postcard-sized three-sheet spelled in a horizontal direction) that is configured in such a manner as to be folded into a substantially Z-shape via a folding portion and used for pressure bonding. By applying a different temperature at the time of impregnating and drying to make the adhesive strength after pressure bonding of the pressure-sensitive adhesive layers laminated on the front and back surfaces different, the aqueous emulsion pressure-sensitive adhesive The absorbency to the paper substrate surface can be made different, whereby the adhesion strength can be arbitrarily adjusted for each pressure-bonded surface by controlling the impregnation amount, anchoring property, etc. of the aqueous emulsion pressure-sensitive adhesive.
{Circle around (8)} As the printing of the recorded contents on the paper base material, an ultraviolet-curable ink may be used to promote the drying and fixing of the ink by irradiating ultraviolet rays, and then an aqueous emulsion adhesive may be applied.
[0027]
With this configuration, the ultraviolet curable ink (functional ink using an ultraviolet curable resin as a binder component) can be completely fixed in a short time before the application of the aqueous emulsion adhesive by the irradiation of ultraviolet light. Printed layers such as patterns-Adhesives facing the adhesive-Printed layers such as patterns-Paper substrate when peeled from the pressure-sensitive adhesive as paper base-Adhesion between printed layers such as patterns is more secure Therefore, between the adhesive force (A) between the adhesive layer 2 and the adhesive layer 2 and the adhesive force (B) between the paper substrate 1 and the printed layer 3 such as a pattern, (B)> Since the relationship of (A) can be maintained, the ink transfer property at the time of peeling can be suppressed. On the other hand, the type that combines oxidative polymerization and penetration of oily components, such as solidification and fixing of commonly used printing ink to paper base, requires several days to complete fixing, and After completion, the strength of the ink film does not increase.
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0029]
As shown in FIGS. 1 to 4, the information recording paper of this embodiment has an adhesive property that does not adhere in a normal state to at least one side of a paper substrate 1 having a water absorption temperature dependency and can be peeled off by pressure. The aqueous emulsion pressure-sensitive adhesive layers 2 shown are laminated (in this manner, the aqueous emulsion pressure-sensitive adhesive layers 2 applied to the paper substrate 1 show adhesiveness by pressure and are pressed together. The aqueous emulsion pressure-sensitive adhesive layers 2 have a property that they can be peeled off at room temperature).
[0030]
As the paper substrate 1, a commercially available inkjet paper for a so-called inkjet printer (printing style of a printer for a personal computer) was used.
[0031]
The water absorption temperature dependency (temperature dependency of the water absorption rate of the paper substrate 1) means a property that the water absorption at a high temperature is larger than the water absorption at a normal temperature. The normal temperature generally means about 23 ° C. ± 3 ° C. However, since the temperature fluctuates depending on the season, appropriate measures are taken according to the seasonal temperatures such as summer and winter. That is, the temperature higher than the normal temperature at the time of impregnation drying of the pressure-sensitive adhesive layer 2 can be set to about 40 ° C. when the air temperature is about 23 ° C., for example.
[0032]
The water absorption temperature dependency of the paper substrate 1 is set to satisfy the following expression.
[0033]
BA ≧ 8 (g / m ² )
(A is the sizing degree at 23 ° C. measured under the condition of a contact time of 10 seconds according to the paper and paperboard-water absorption test method by the Cobb method of JIS P8140, and B is the sizing degree at 40 ° C.)
When the aqueous emulsion pressure-sensitive adhesive is applied to the paper substrate 1 and impregnated and dried, a state in which the surface temperature of the paper substrate 1 exceeds about 40 ° C. is effective for drying and fixing the aqueous emulsion pressure-sensitive adhesive. The high water absorption (size B at 40 ° C.) of the paper base material 1 in the temperature range increases the anchoring property of the water-based emulsion pressure-sensitive adhesive to the paper base material 1, while the post-compression bonding as a postcard causes Reduces the water absorption at normal temperature around 23 ° C. (size A at 23 ° C.), and removes paper scum at the time of peeling (between the paper base material 1 and the adhesive layer 2 instead of between the adhesive layers 2 or (The surface layer of the paper substrate 1 is broken and peeled off.)
[0034]
When the water-based emulsion pressure-sensitive adhesive is mainly composed of a rubber-based adhesive, the adhesiveness under pressure can be more effectively exerted.
[0035]
Here, an aqueous emulsion pressure-sensitive adhesive layer 2 is formed on the upper side of the printed layer 3 such as a pattern previously formed on the paper substrate 1. Therefore, the water-based emulsion pressure-sensitive adhesive layer 2 exists on the upper side of the printed layer 3 such as a pattern (including the case of only characters). Since the aqueous emulsion pressure-sensitive adhesive layer 2 is not masked by the printed layer 3 such as a picture, it is possible to avoid a change in the adhesive force after pressure bonding and to obtain a stable adhesive force.
[0036]
Examples of the method of printing the print layer 3 such as a pattern include offset planographic printing, so-called inkjet printing, and printing with an ink ribbon.
[0037]
This information recording paper is coated with an aqueous emulsion pressure-sensitive adhesive on a paper substrate 1 having a water absorption temperature dependency, and is impregnated and dried at a temperature (for example, 40 ° C. or higher) higher than normal temperature (for example, 23 ° C.) to obtain a temperature lower than normal temperature. Improving the water absorption (permeability of the water-based emulsion pressure-sensitive adhesive) of the paper substrate 1 having the water-absorption temperature dependency at the time of impregnation and drying of the water-based emulsion pressure-sensitive adhesive at a high temperature (for example, 40 ° C. or higher), The anchoring property of the aqueous emulsion pressure-sensitive adhesive with respect to the paper base material 1 can be ensured. For example, when actually used as a postcard in a town, the temperature is normal temperature (for example, 23 ° C.). The water absorbency of the paper base material 1 having a water content is lower than that during the impregnation and drying of the aqueous emulsion pressure-sensitive adhesive (at a temperature higher than room temperature). Difficult It can be an advantage that can be less susceptible to wet than before.
[0038]
Next, a method for manufacturing the information recording paper of this embodiment will be described.
[0039]
In this method for producing information recording paper, an aqueous emulsion pressure-sensitive adhesive is applied to at least one surface of a paper substrate 1 having a water absorption temperature dependency, and the temperature is higher than normal temperature (for example, 23 ° C.) (for example, 40 ° C. or higher). By impregnating and drying, the water-based emulsion pressure-sensitive adhesive layer 2 which does not adhere in a normal state and exhibits adhesiveness that can be peeled off by pressure is laminated.
[0040]
According to this production method, an aqueous emulsion pressure-sensitive adhesive is applied to at least one side of the paper substrate 1 having a water absorption temperature dependency, and is impregnated and dried at a temperature higher than normal temperature (for example, 23 ° C.) (for example, 40 ° C. or higher). Water absorption of the paper base material 1 having a water absorption temperature dependency upon impregnation and drying of the aqueous emulsion pressure-sensitive adhesive at a temperature higher than room temperature (for example, 40 ° C. or higher) (permeability of the aqueous emulsion pressure-sensitive adhesive) And the anchoring property of the aqueous emulsion pressure-sensitive adhesive to the paper base material 1 having improved water absorption can be secured. On the other hand, for example, when actually used as a postcard in a town, the temperature is normal temperature (for example, 23 ° C.). Therefore, the water absorption of the paper substrate 1 having the water absorption temperature dependency is lower than that when the aqueous emulsion pressure-sensitive adhesive is impregnated and dried (at a temperature higher than normal temperature). It is possible to make it difficult for water to seep into the material 1 and to make it difficult for water to seep into the paper substrate 1 even if it has rain or the like, and it is possible to make the material less susceptible to water wetting than before. There are advantages.
[0041]
Here, as a method of applying an aqueous emulsion pressure-sensitive adhesive to the paper base material 1 and impregnating and drying the paper base material 1 at a temperature higher than normal temperature (for example, 23 ° C.), there is the following method, for example.
[0042]
{Circle around (1)} The aqueous emulsion pressure-sensitive adhesive is applied to the paper substrate 1 at room temperature, and the temperature of the application surface of the paper substrate 1 is 40 ° C. or higher at a temperature higher than room temperature (put in a hot air drying chamber at 100 ° C. or higher). Impregnated and dried to obtain
[0043]
(2) An aqueous emulsion pressure-sensitive adhesive at room temperature is applied to the paper base material 1 heated to 40 ° C. or higher, and impregnated and dried at a temperature higher than room temperature (even if it is naturally dried as described in (1) above) Forced drying under heating).
[0044]
{Circle around (3)} An aqueous emulsion pressure-sensitive adhesive heated to at least 40 ° C. is applied to the paper substrate 1 at room temperature, and impregnated and dried at a temperature higher than room temperature. Forced drying under heating).
[0045]
{Circle around (4)} An aqueous emulsion pressure-sensitive adhesive heated to 40 ° C. or higher is applied to the paper substrate 1 heated to 40 ° C. or higher, and impregnated and dried at a temperature higher than room temperature (even if air dried as it is). (Forced drying may be performed under heating as in the above <1>).
[0046]
Here, as shown in FIG. 2, after the printing layer 3 such as a pattern is formed on the paper base material 1 first, the aqueous emulsion pressure-sensitive adhesive is formed on the printing layer 3 such as the pattern. Therefore, the water-based emulsion pressure-sensitive adhesive layer 2 is present on the upper side of the pattern or the like printing layer 3. Since the pressure-sensitive adhesive layer 2 is not masked, it is possible to avoid a change in the adhesive force after the pressure bonding and to obtain a stable adhesive force.
[0047]
As a print layer 3 such as a picture of a recorded content on the paper base material 1, an ultraviolet curable ink (a functional ink containing an ultraviolet curable resin as a binder component) is used to promote drying and fixing of the ink by irradiating ultraviolet light, and then an aqueous emulsion adhesive is used. Is preferably applied. By using an ultraviolet curable ink, the following effects can be expected. That is, since the ultraviolet curable ink can be fixed in a short time before the application of the aqueous emulsion adhesive by ultraviolet irradiation, the adhesive facing the paper substrate 1, the print layer such as a picture 3, the adhesive layer 2, etc. Since the adhesion between the paper substrate 1 and the printed layer 3 such as the pattern when the layer 2-the printed layer 3 such as the pattern 3-the paper substrate 1 is peeled from the pressure-sensitive adhesive state is more reliably realized, The relationship of (B)> (A) is maintained between the adhesive force (A) between the adhesive layer 2 and the adhesive layer 2 and the adhesive force (B) between the paper substrate 1 and the printed layer 3 such as a pattern. Therefore, the ink transfer property at the time of peeling can be suppressed.
[0048]
Next, FIGS. 5 to 9 show two types of pressure-bonding surfaces 4a and 4b when the paper base material 1 (having a postcard size and spelling three sheets in the horizontal direction) is folded in a substantially Z shape and laminated. The temperature at the time of impregnation and drying of the aqueous emulsion pressure-sensitive adhesive is set (for example, 80 ° C. and 120 ° C.), and the paper substrate 1 is folded in a Z-shape to form the aqueous emulsion pressure-sensitive adhesive layers 2 together. We are trying to crimp.
[0049]
When the two types of pressure-bonded surfaces 4a and 4b of the paper substrate 1 are set to have different temperatures at the time of impregnation and drying of the aqueous emulsion pressure-sensitive adhesive, the surface of the paper substrate 1 of the aqueous emulsion pressure-sensitive adhesive is set. The adhesive strength can be arbitrarily adjusted for each of the crimping surfaces 4a and 4b by controlling the impregnation amount of the aqueous emulsion pressure-sensitive adhesive, the anchoring property, and the like.
[0050]
That is, when the temperature during the impregnation and drying is set to be high, the adhesive strength of the pressure-bonded surfaces 4a and 4b can be set low. On the other hand, when the temperature during the impregnation and drying is set to be low, the adhesive strength between the pressure-bonded surfaces 4a and 4b is set to be high. be able to.
[0051]
【Example】
Next, the configuration of the present invention will be described more specifically.
(Example 1)
According to the process shown in FIG. 3 and FIG. 4, a paper substrate 1 on which a pattern or the like printing layer 3 is formed in advance by ultraviolet curable ink as a continuous web of paper is fed, and the pattern or the like printing layer 3 is coated in an application area 6. An emulsion pressure-sensitive adhesive was applied on the substrate, impregnated and dried at a temperature of 120 ° C., and an aqueous emulsion pressure-sensitive adhesive layer 2 was laminated thereon to prepare an information recording paper according to the present invention.
[0052]
The paper substrate 1 used here was an inkjet paper (basis weight, 128 g / m2) manufactured by Mitsubishi Paper Mills. ² ), Whose water absorption temperature dependence is such that the sizing degree A at 23 ° C. is 17.7 g / m 2 ² , The degree of size B at 40 ° C. is 32.2 g / m ² Therefore, the [BA] value is 14.5 g / m ² It was.
[0053]
The emulsion pressure-sensitive adhesive used was a natural rubber-based adhesive having a moisture content of 62% (trade name: MUX-101, manufactured by Seiden Chemical Co., Ltd.).
[0054]
The information recording paper according to the present invention thus produced is fed to the folding area 7 and folded in a V-shape with the aqueous emulsion pressure-sensitive adhesive layer 2 inside, and then postcarded by the cutting cylinder-8. , Pressed by a pressure cylinder -9, discharged, and stored as a two-sided folded V-shaped pressure-bonded postcard shown in FIG.
(Comparative Example 1)
Instead of the paper substrate 1 used in Example 1, a coated paper having substantially no dependency on the water absorption temperature, that is, a sizing degree A of 11.0 g / m at 23 ° C. ² And the [BA] value is 3.2 g / m. ² An information recording paper for comparison and a pressure-bonded postcard based on the same were prepared in the same manner as in Example 1 except that the above-mentioned paper was used.
(Comparative Example 2)
In place of the paper base material 1 used in Example 1, high quality paper having substantially no water absorption temperature dependency, that is, a size degree A at 23 ° C. of 14.7 g / m ² And [BA] value is 3.0 g / m. ² An information recording paper for comparison and a pressure-bonded postcard based on the same were prepared in the same manner as in Example 1 except that the above-mentioned paper was used.
(Comparative Example 3)
A commercially available pressure-sensitive postcard information recording paper (manufactured by Mitsubishi Paper Industries, trade name: Diamond Z) is used as it is for comparison as an information recording paper ([BA] value is 4.5 g / m). ² A, 12.5 g / m ² ) And pressurized under the same conditions as in Example 1 to prepare a comparative pressure-bonded postcard.
[0055]
The characteristics of the pressure-bonded postcards obtained from Example 1 and Comparative Examples 1 to 3 were evaluated according to the following methods. Table 1 shows the evaluation results.
(Peeling resistance after wetting with water)
After immersing the pressure-bonded postcard in water at 23 ° C. for 2 seconds and pulling it up, after 20 seconds from the pull-up, the two-sided postcard is peeled off by hand and the breakage between the paper substrate 1 and the aqueous emulsion pressure-sensitive adhesive layer 2 is visually judged. Then, the case where the adhesive did not transfer to the opposite surface was marked with ○, the case where the transfer was slightly observed was marked with △, and the case where the transfer was remarkable and practically hindered was marked with x.
(Ink transfer)
At the time of peeling according to the above procedure, destruction occurs between the paper substrate 1 and the printed layer 3 such as a pattern adjacent thereto, and the phenomenon that the ink of the printed layer 3 such as the pattern is transferred to the opposite surface facing the surface is visually determined. Is marked with ○ when no transfer occurs on the opposite side, Δ when slight transfer is observed, and x when transfer is extremely disturbing in practical use.
[0056]
[Table 1]

As is evident from Table 1, the adhesive postcard using the information recording paper of the present invention in which the paper substrate 1 has a water absorption temperature dependency was confirmed to have excellent water resistance, but the adhesive postcard according to the comparative example was confirmed. In the case of (1), the peeling resistance after wetting with water and the good ink transferability could not be satisfied at the same time, and it was insufficient enough to cause practical problems.
(Example 2)
Another embodiment of the manufacturing method of the present invention will be described as an example of manufacturing a Z-shaped crimped postcard (three-folded) with reference to FIGS.
[0057]
As shown in FIG. 5 to FIG. 7, on the paper substrate 1 (postcard paper), a printed layer 3 such as a picture (a sender name and other printing ink portions) is formed on both sides, and an aqueous emulsion pressure-sensitive adhesive layer is formed on the upper side thereof. 2 are formed, and the postcard main body 10, the sticking piece 11, and the crimping attaching piece 12 are connected and folded in a Z-shape.
[0058]
As shown in FIGS. 8 and 9, the paper base material 1 (the printed layer 3 such as a pattern has been formed) is fed as the continuous web 5, and the two coated areas 6 a and 6 b of the emulsion pressure-sensitive adhesive are used. The emulsion pressure-sensitive adhesive layer 2 is formed by applying, impregnating, and drying on a predetermined portion of the substrate.
[0059]
As shown in FIG. 5, when the postcard is formed in a Z-shape, the pressure-bonding surfaces 4a and 4b on both the front and back surfaces of the paper base material have different required adhesive strength. It is the crimping surface 4b on which the confidential transmission information to the recipient is recorded, and the other crimping surface 4a on which the information is not printed or printed is required to have peelability after the crimping (the adhesive strength needs to be weak). Do not peel easily (must have strong adhesive strength).
[0060]
In order to satisfy this demand, the present invention provides a manufacturing method specified in claim 7. That is, in the process shown in FIGS. 8 and 9, the impregnated drying temperature of the application area 6a of the emulsion pressure-sensitive adhesive layer 2 from which peeling is expected is set to the other emulsion pressure-sensitive adhesive layer which must not be peeled. By setting the temperature higher than the impregnation and drying temperature of the second application region 6b, the difference in the adhesive strength between the pressure-bonded surface 4a and the pressure-bonded surface 4b can be arbitrarily controlled as a relationship of “4a> 4b”.
[0061]
【The invention's effect】
The present invention is configured as described above and has the following effects.
[0062]
INDUSTRIAL APPLICABILITY The information recording paper and the method for producing the same according to the present invention use a paper base material having a dependency on water absorption temperature. It has an excellent action and effect.
[Brief description of the drawings]
FIG. 1 is a perspective view illustrating an information recording sheet according to a first embodiment of the present invention.
FIG. 2 is an enlarged sectional view of the information recording paper of FIG.
FIG. 3 is a schematic process side view for explaining the V-shaped pressure-bonded postcard manufacturing apparatus of FIG. 1;
FIG. 4 is a schematic front view of a process for explaining the V-shaped crimped postcard manufacturing apparatus of FIG. 1;
FIG. 5 is a perspective view illustrating Embodiment 2 of the information recording sheet of the present invention.
FIG. 6 is a front view (before folding) of the Z-shaped crimped postcard of FIG. 5;
FIG. 7 is a rear view (before folding) of the Z-shaped crimped postcard of FIG. 5;
FIG. 8 is a schematic process side view illustrating the Z-shaped crimped postcard manufacturing apparatus of FIG. 5;
FIG. 9 is a schematic front view illustrating a process for manufacturing the Z-shaped crimped postcard manufacturing apparatus of FIG. 5;
[Explanation of symbols]
1 Paper substrate
2 Aqueous emulsion pressure-sensitive adhesive layer
3 Printed layers such as patterns
4 Crimp surface

Claims (8)

An information recording characterized in that an aqueous emulsion pressure-sensitive adhesive layer showing an adhesive property that does not adhere in a normal state but can be peeled off by pressure is laminated on at least one surface of a paper substrate having a water absorption temperature dependency. Paper. 2. The information recording paper according to claim 1, wherein said aqueous emulsion pressure-sensitive adhesive layer is impregnated and dried at a temperature higher than room temperature. The information recording paper according to claim 1, wherein an aqueous emulsion pressure-sensitive adhesive layer is formed on a print layer such as a pattern formed earlier on the paper base material. The information recording paper according to any one of claims 1 to 3, wherein the water absorption temperature dependency satisfies the following expression.
BA ≧ 8 (g / m ² )
(A is the sizing degree at 23 ° C. measured under the condition of a contact time of 10 seconds according to JIS P8140, and B is the sizing degree at 40 ° C.) An aqueous emulsion pressure-sensitive adhesive is applied to at least one side of a paper substrate having a water absorption temperature dependency, and is impregnated and dried at a temperature higher than room temperature, so that the adhesive does not adhere in a normal state but can be peeled off by pressure. A method for producing an information recording paper, comprising laminating an aqueous emulsion pressure-sensitive adhesive layer showing the following. 6. The method for producing an information recording sheet according to claim 5, wherein after forming a print layer such as a pattern on the paper base material, an aqueous emulsion pressure-sensitive adhesive is formed on the upper side of the print layer such as a pattern. A method for manufacturing an information recording paper which is folded in a substantially Z-shape through a folding part and used by pressure bonding, wherein an aqueous emulsion pressure-sensitive adhesive is applied to both front and back surfaces of a paper base material, and the temperature at the time of impregnation and drying is different. 7. The method for manufacturing an information recording sheet according to claim 5, wherein the pressure-sensitive adhesive layers laminated on both the front and back surfaces have different adhesive strengths after pressure bonding by setting as described above. The information according to any one of claims 5 to 7, wherein an aqueous emulsion adhesive is applied after printing of the recorded content on the paper base material is performed by using an ultraviolet-curable ink to accelerate drying and fixing of the ink by ultraviolet irradiation. Manufacturing method of recording paper.

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