JP2002348800A - Paper with watermark and method of watermark-forming processing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper with a watermark, having the watermark part with a clear and vivid outline while reducing the reduction of the strength of the paper. SOLUTION: A paper face 2 of a blank paper 1 is pushed by a seal face of a relief printing plate to plastically deform the paper face 2 of the paper 1. A concave part 3 of the printed image copying the pattern or the like of the seal face of the relief printing plate is formed on the blank paper 1 by the plastic deformation of the paper face 2 so as to have the concave shape. After the formation of the concave part 3 of the printed image, a luster coating material is coated on the paper face 2 of the blank paper 1, that is the concave-formed face of the concave part 3 of the printed image in the blank paper 1 so as to form a layer, to allow the luster coating material to penetrate into the paper face 2 and the concave part 3 of the printed image. When the luster coating material penetrated into the paper face 2 and the concave part 3 of the printed image is solidified, a covering layer 4 is formed by the luster coating material remaining on the paper face 2 and the concave part 3, and the impregnated layer 5 is formed by the luster coating material impregnating the blank paper from the paper face 2 and the concave part 3. As a result, a watermark pattern 6 copying the prescribed pattern or the like is formed at the position corresponding to the concave part 3 of the printed image of the blank paper 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a watermarked paper in which a watermark having a light transmittance higher than that of the paper itself is formed on a paper having light transmittance, and a method of processing the watermark.

[0002]

2. Description of the Related Art Some types of paper, such as Japanese paper and Western paper, are provided with a watermark pattern on the paper surface in order to impart decorativeness to the paper. Various methods of processing such a watermark pattern on paper have been conventionally proposed. For example, there is a method of processing a watermark pattern in a paper making process. For example, a watermarking method in the papermaking process includes a papermaking watermarking method in which the paper thickness of the portion where the watermark pattern is formed is made thinner than the background portion (the portion where the watermark pattern is not formed), and pressing the paper surface by stamping ( Pressing) to process a watermark pattern.

According to the former papermaking watermarking method, since the paper thickness of the portion where the watermark pattern is formed is made thinner than the paper thickness of the background portion, the light transmittance of the portion where the watermark pattern is formed is reduced by the light transmittance of the background portion. Higher and the watermark pattern becomes a white watermark. According to the latter press working method, the light transmittance of the pressed portion is higher than the light transmittance of the non-pressed portion by partially reducing the paper thickness of the paper by pressing the paper surface by stamping. The pressed part becomes a white watermark.

On the other hand, as a method of processing a watermark pattern on paper, there is a method of processing a watermark pattern by a printing process performed after paper making, in addition to the above-described method. In the method of processing a watermark pattern in this printing process, the watermark ink is attached to the paper by the printing device, so that the light transmittance of the portion where the watermark ink is attached becomes higher than that of the non-adhered portion, and the adhesion of the watermark ink is increased. The part becomes a white watermark.

[0005]

However, in the above papermaking watermark processing method, in order to process the watermark pattern, the fiber density of the portion where the watermark pattern is formed is reduced and the paper thickness of the paper is partially reduced. There is a need. For this reason,
There is a problem that the strength of the portion where the watermark pattern is formed is lower than that of the portion where the watermark pattern is not formed, so that the portion is easily torn, and the strength of the entire sheet is reduced. On the other hand, according to the press working method, the watermark pattern is formed by the press working, so that the fiber density of the portion where the watermark pattern is formed (that is, the pressed portion) does not decrease, and the reduction in paper strength is suppressed. You.

However, according to such a press working method, when a watermark pattern is pressed on a thick paper such as Japanese paper, the thickness of the pressed portion where the watermark pattern is formed is made sufficiently thinner than the non-pressed portion. In some cases, the light transmittance of the watermark pattern cannot be made sufficiently larger than that of the background portion. For this reason, since the watermark pattern only appears in the form of irregularities on the paper surface, there is a problem that the watermark pattern becomes difficult to see due to the degree of light applied to the irregularities.

Further, according to the method of processing a watermark pattern by a printing process, the viscosity of the watermark ink is reduced in order to increase the permeability to paper. For this reason, depending on the type of the watermark ink, there is a problem that the watermark ink adhered to the paper surface bleeds on the paper and the outline of the watermark pattern becomes unclear.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to suppress a decrease in the strength of a sheet, to form a watermarked sheet having a clear outline and a clear watermark portion, and to process the watermark. It is intended to provide a way.

[0009]

In order to achieve this object, the watermarked paper according to claim 1 is a paper having a light transmittance, and has a light transmittance higher than the light transmittance of the paper itself. A watermark having a watermark portion, the watermark portion being recessed on one surface of the paper so as to imitate a predetermined pattern, and being formed to be thinner than the thickness of the paper itself. It has a concave portion, and is formed by impregnating and solidifying a resin material having optical transparency in the image concave portion.

According to a second aspect of the present invention, there is provided the watermarked sheet according to the first aspect, wherein the resin material is formed on one surface of the sheet having the recessed image formed thereon. This is to form a coating layer covering portions and non-formed portions.

According to a third aspect of the present invention, there is provided the watermarked paper according to the first or second aspect, wherein the resin material is a glossy paint that imparts gloss and water resistance to the paper.

According to a fourth aspect of the invention, there is provided a watermark processing method for forming a watermark portion having a light transmittance higher than the light transmittance of the sheet itself on a light-transmitting sheet,
A pressing step of pressing the paper surface with the convex printing surface to form a printing concave portion suitable for the printing surface on the paper surface, and a resin having a light transmitting property on the paper on which the printing concave portion is formed by the pressing process And a painting process for painting the material.

According to a fifth aspect of the present invention, in the watermarking method according to the fourth aspect, the coating step is performed by coating a resin material on a paper surface on which the image recess is formed by the pressing step. Then, a coating layer for covering the paper surface is formed.

According to a sixth aspect of the present invention, there is provided the watermark processing method according to the fourth or fifth aspect, wherein the resin material is impregnated into the paper on which the watermark portion is formed, so that the surface of the paper is glossy. And a gloss paint that imparts water resistance to the paper itself.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a watermarked paper and a watermark processing method according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of the sheet 1 before a pressing step for forming the image recess 3 is performed, and FIG. 2 is a sheet 1 on which the image recess 3 is formed by the pressing step of FIG. FIG. Note that in FIG.
Base 10 and letterpress 1 used for applying a pressing process to
1 is illustrated.

As shown in FIG. 1, the paper 1 is a sheet-like paper material having a light transmitting property (a property of transmitting light) such as Japanese paper and Western paper, and is placed on a base 10. . The base 10 supports the paper surface 2 of the paper 1 while facing the stamped surface 12 of the relief printing plate 11. The relief printing plate 11 is a pressing die for recessing the imprinted concave portion 3 on the paper surface 2 of the paper 1. . On the stamp surface 12 of the relief printing plate 11, characters, symbols or patterns (including images) or a combination thereof (hereinafter, “patterns etc.”)
Called. ) Are formed in a convex shape, and compression of the paper surface 2 by the convex portion 13 causes the paper 1
Then, the image concave portion 3 is provided (pressing step).

Specifically, in the pressing step, the stamp surface 1
2, the paper surface 2 of the paper 1 supported by the base 10
Is pressed, and the paper surface 2 of the paper 1 is compressed by the convex portions 13 of the stamp surface 12 to be plastically deformed. Due to the plastic deformation of the paper surface 2, the letterpress 1 is provided on the paper surface 2 of the paper 1 as shown in FIG.
The image concave portion 3 is formed as a concave depression conforming to the first convex portion 13. In addition, when the paper surface 2 is viewed from above, the imprinted concave portion 3 is formed as an inverted image such as a pattern formed by the convex portion 13 of the printed surface 12.

Further, the image concave portion 3 is provided with the convex portion 13 of the relief plate 11.
Compression, the thickness of the paper 1 itself, that is, the paper surface 2
To a contact surface with the base 10 (hereinafter, referred to as a “back surface of the paper 1”). It is easy to penetrate. In addition, since the imprint concave portion 3 is processed by pressing the paper surface 2 of the general-purpose paper 1 with the relief plate 11, it is not necessary to process a watermark pattern in the paper making process (process) of the paper 1, and the commercially available image concave portion 3 is commercially available. Watermarking can be performed on general-purpose paper at low cost.

FIG. 3 is a sectional view of the sheet 1 on which a coating process has been performed, and FIG. 4 is a perspective view of the sheet 1 of FIG. FIG.
As shown in FIG. 2, the paper 1 having the image recessed portion 3 formed thereon has a sheet surface 2 (hereinafter also referred to as a “non-formed portion of the image recessed portion 3”).
Further, a coating layer 4 covering the image concave portion 3 and an impregnated layer 5 formed on the paper surface 2 and the surface layer portion of the image concave portion 3 are formed. The coating layer 4 and the impregnating layer 5 are formed in layers by solidifying a resin coating composed of a transparent or translucent resin material having optical transparency.

Here, the above-mentioned resin paint is a gloss paint that gives gloss and water resistance to the paper 1. Therefore, paper 1
Is formed by the covering layer 4 and the impregnating layer 5,
And the decorativeness is improved, and it is possible to prevent the paper 1 from absorbing water and swelling and becoming brittle.

In the coating step of forming the coating layer 4, the paper 1
, Ie, the concave surface of the image concave portion 3 of the sheet 1 is coated with a resin paint in a layered manner, and the resin paint is permeated into the paper surface 2 and the image concave portion 3. Thereafter, when the resin paint that has permeated the paper surface 2 and the image concave portion 3 is solidified, the coating layer 4 is formed by the resin paint remaining on the paper surface 2 and the image concave portion 3,
An impregnated layer 5 is formed from the paper surface 2 and the image concave portion 3 by a resin paint impregnated in the paper 1.

Since the thickness of the paper 1 itself is kept as it is in the portion of the paper 1 where the image recess 3 is not formed, the resin paint cannot penetrate to the back of the paper 1 and the impregnated layer 5 Is formed only on the surface layer portion of. Meanwhile, paper 1
Is formed to be thinner than the thickness of the paper 1 itself, so that the resin paint can penetrate to the back of the paper 1 and the impregnated layer 5 reaches the back of the paper 1. For this reason, the light transmittance of the image concave portion 3 is higher than that of the portion where the image concave portion 3 is not formed by the resin coating material having light transmittance.

As a result, as shown in FIG. 4, a watermark pattern 6 in the shape of a predetermined pattern or the like is formed in a portion of the sheet 1 corresponding to the image concave portion 3, while the image concave portion 3 is formed.
Is formed in the non-formed portion, the background portion 7 having a lower light transmittance than the watermark pattern 6 is formed.

As described above, according to the paper 1 containing the watermark pattern 6 formed by the pressing step and the painting step of the present embodiment, the watermark pattern 6 Is improved as compared with the background portion 7, so that the watermark pattern 6 can be made to stand out. Further, since the image concave portion 3 is formed thinner than the thickness of the paper 1 itself, the resin paint is more easily permeated than the portion where the image concave portion 3 is not formed. Result, watermark 6
Is suppressed, and a clear watermark pattern 6 having a clear outline can be formed.

Although the image recess 3 is thinner than the thickness of the paper 1, the strength is reinforced by the resin coating material forming the coating layer 4 and the impregnating layer 5. Therefore, it is possible to suppress a decrease in the strength of the sheet 1 due to the installation. And paper 1
A coating layer 4 on which a resin paint as a resin material is solidified
Since the impregnating layer 5 is formed, the layers 4 and 5 can prevent the image recess 3 from being deformed. For example, the covering layer 4 and the impregnating layer 5 can prevent the paper 1 from swelling due to the contact of the paper surface 2 with water droplets or moisture in the atmosphere, and can prevent the shape collapse of the image concave portion 3 due to the swelling.

In the present embodiment, the pressing step and the painting step are performed in separate steps. For example, after applying a resin paint to the stamped surface 12 of the relief plate 11, the paper 1 is pressed by the stamped surface 12. It is also possible to simultaneously perform the recessing of the image concave portion 3 and the coating of the resin paint. However, in such a case, the resin paint overflows from between the stamp surface 12 and the paper surface 2 when pressed by the stamp surface 12, and it becomes difficult to apply the resin paint uniformly on the paper surface 2 of the paper 1. . Further, the portion where the resin paint is applied by the pressing of the relief surface 11 by the stamp face 12 is limited to the periphery of the image recess 3. Can not do it.

Therefore, in order to solve these problems,
In this embodiment, the coating process is performed after the pressing process, so that the resin coating is applied in a uniform layer on the printing recess 3 on the paper surface 2 of the paper 1, and both the printing recess 3 and the non-forming portion are formed. It is covered with resin paint.

As described above, the present invention has been described based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the gist of the present invention. Can easily be inferred.

For example, in this embodiment, the coating layer 4 and the impregnated layer 5 are formed by applying a resin paint to the paper surface 2 which is the concave surface of the image concave portion 3, but the painted surface of the resin paint is not necessarily required. The present invention is not limited to this, and a resin paint may be applied to the back surface of the paper 1. Further, in the present embodiment, as shown in FIG. 4, the characters "A", "B", and "C" are used as the watermark pattern 6, but it is needless to say that the watermark pattern 6 is replaced with other characters or symbols. Alternatively, it may be a pattern or a combination thereof.

[0030]

According to the watermarked paper and the watermark processing method of the present invention, the watermark portion formed on the paper is formed by impregnating the resin imprint having light transmittance into the thin-walled image concave portion and solidifying it. Thus, the resin material has an effect that the light transmittance of the image concave portion can be greatly improved, and the pattern formed by the image concave portion can be clearly distinguished.

Further, since the image concave portion is formed thinner than the thickness of the paper itself, the resin material can be easily permeated as compared with the portion where the image concave portion is not formed. For this reason, it is possible to prevent the resin material penetrating into the image concave portion from bleeding into a portion where the image concave portion is not formed, and to form a clear watermark portion having a clear outline. Furthermore, since the resin material having optical transparency is impregnated and solidified in the thin image concave portion, the strength of the image concave portion can be reinforced by such a resin material, and a decrease in paper strength can be suppressed. This has the effect.

In particular, according to the watermarked paper according to the second aspect and the watermarking method according to the fifth aspect, the resin material impregnated in the paper is impregnated and solidified on the surface of the paper in which the image recess is formed. Thus, it is possible to form a coating layer that covers the formation portion and the non-formation portion of the image concave portion. Therefore, such a coating layer has the effect of preventing the imprint concave portions provided on the paper surface from being deformed. For example, the paper surface covered with the coating layer is prevented from coming into contact with water droplets or moisture in the atmosphere, so that it is possible to prevent the paper from swelling due to such moisture and disturbing the shape of the imprinted concave portion.

According to the watermarked paper according to the third aspect, the resin material impregnated in the paper is a gloss paint for imparting gloss to the paper, so that the decorativeness of the paper on which the watermark portion is formed can be improved. There is an effect that can be. In addition, the glossy paint imparts water resistance to the paper itself, and thus has the effect of preventing the paper from swelling and becoming brittle.

Further, according to the watermark processing method of the present invention, in the pressing step, the printing surface is pressed by the convex stamping surface, so that the image concave portion is recessed in the sheet surface, so that the papermaking process is performed. In the process, there is no need to form an image recess.
Therefore, there is no need to specially manufacture the paper on which the watermark pattern has been processed in the paper making process, and there is an effect that the watermark processing can be performed at low cost using commercially available paper.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a sheet before a pressing step is performed.

FIG. 2 is a cross-sectional view of a sheet on which an image concave portion is formed by a pressing step.

FIG. 3 is a cross-sectional view of a sheet on which a painting process has been performed.

FIG. 4 is a perspective view of the sheet of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper 2 Paper surface (1 paper surface, paper surface) 3 Imprint concave part 4 Coating layer (coating layer, part of resin material) 5 Impregnation layer (part of resin material) 6 Watermark pattern (watermark part) 7 Background part (Background of paper) 12 Seal

Claims (5)

[Claims] 1. A watermarked paper, wherein the watermarked paper is formed of a light-transmitting paper and has a watermark portion having a light transmittance higher than the light transmittance of the paper itself. 1 of the paper
It is provided with an image recess which is recessed on the surface and formed so as to be thinner than the thickness of the paper itself, and is formed by impregnating the image recess with a resin material having optical transparency and solidifying it. Watermarked paper characterized by the following. 2. The method according to claim 1, wherein the resin material forms a coating layer on one surface of the sheet in which the image concave portion is formed, covering a portion where the image concave portion is formed and a portion where the image concave portion is not formed. The watermarked paper according to claim 1, wherein 3. The watermarked paper according to claim 1, wherein the resin material is a glossy paint that imparts gloss and water resistance to the paper. 4. A watermark processing method for forming a watermark portion having a light transmittance higher than the light transmittance of the paper itself on a light-transmitting paper, wherein the paper surface is pressed by a convex stamp surface. And a coating step of coating a light-transmissive resin material on the paper on which the image recesses are formed by the pressing step. Watermark processing method characterized by the following. 5. The coating step, wherein a resin layer is coated on a paper surface on which an image recess is formed by the pressing step, thereby forming a coating layer covering the paper surface. Item 6. The watermark processing method according to Item 4.