JP7353776B2 - Smooth paper and its manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a smooth paper having a colored pattern and a method for producing the same.

Fancy paper, which is mainly made of fibers derived from wood pulp and the like and has various colors and patterns, is used for, for example, high-quality wrapping paper, the front and back covers of books, catalogs and pamphlets, and calendar paper.

Patent Document 1 discloses a patterned paper having crater-shaped depressions as one type of such fancy paper, and the patterned paper is made by applying water droplets to the paper stock on a wire during paper making to form craters. It is manufactured by forming a shaped depression and then applying a coloring agent in a size press process.

Japanese Patent Application Publication No. 6-272198

However, in the patterned paper described in Patent Document 1, the coloring agent accumulates in the crater-shaped depressions, and the depressions become darker than the background, so the resulting pattern is polka dots in which dark-colored dots are dispersed on a light-colored background. It becomes a pattern.

Generally, printing suitability of paper is improved by increasing smoothness, but in the patterned paper manufacturing method described in Patent Document 1, the shape of the crater-shaped depression is at least size-pressed in order to accumulate coloring material in the depression. It is necessary to maintain the pattern until the completion of the process, and it may be difficult to improve the smoothness of the patterned paper.

An object of the present invention is to provide a paper having a pattern different from a polka dot pattern in which dark colored dots are dispersed on a light colored background, and which has a smooth surface.

The smooth paper of the present invention is
A smooth paper comprising at least one type of fiber and having a non-printed colored pattern,
the non-printed colored pattern includes a light color pattern and a dark color pattern;
It is a smooth paper in which the dark color pattern is continuous.

Preferably, the fibers include at least one natural fiber.

It is preferable that the fiber density of the dark color pattern is greater than the fiber density of the light color pattern.

It is preferable that the brightness of the dark color pattern is lower than the brightness of the light color pattern.

Preferably, at least a portion of the dark color pattern and/or the light color pattern is formed by a curve.

It is preferable that at least a portion of the light-colored pattern is discontinuous. In this case, at least a portion of the discontinuous light color pattern may be a closed region surrounded by a single closed curve.

The color of the colored pattern on the smooth paper of the present invention may be a single color.

The surface roughness of the smooth paper of the present invention is preferably 4.0 μm or less.

The smooth paper of the present invention preferably has a smoothness of 10 seconds or more according to JIS P8119.

The basis weight of the smooth paper of the present invention is preferably 60 to 300 g/m ² .

The first aspect of the manufacturing method of the present invention is
A non-printed colored pattern consisting of at least one type of fiber, comprising a light-colored pattern and a dark-colored pattern, the dark-colored pattern being continuous, using a paper machine with at least a wire part, a press part, a dryer part, and a calender part. A method for producing smooth paper having the following steps:
forming a wet paper in the wire part;
a step of scattering droplets on the surface of the wet paper to make the fiber distribution uneven on the surface;
a step of dewatering the wet paper in the press part;
heating the wet paper in the dryer part, and
A step of pressing the paper after heating in the calendar part,
Furthermore, the manufacturing method includes a step of coloring the wet paper or paper.

The second aspect of the manufacturing method of the present invention is
A non-printed colored pattern consisting of at least one type of fiber, comprising a light-colored pattern and a dark-colored pattern, the dark-colored pattern being continuous, using a paper machine with at least a wire part, a press part, a dryer part, and a calender part. A method for producing smooth paper having the following steps:
forming a wet paper in the wire part;
a step of scattering droplets on the surface of the wet paper to make the fiber distribution uneven on the surface;
a step of dewatering the wet paper in the press part;
heating the wet paper in the dryer part, and
A step of pressing the paper after heating in the calendar part,
A manufacturing method, wherein the droplets contain at least one colorant.

The third aspect of the manufacturing method of the present invention is
A non-printing colored fiber made of at least one colored fiber, including a light color pattern and a dark color pattern, with the dark color pattern being continuous, using a paper machine with at least a wire part, a press part, a dryer part and a calender part. A method for producing smooth paper having a pattern, the method comprising:
forming a wet paper in the wire part;
a step of scattering droplets on the surface of the wet paper to make the fiber distribution uneven on the surface;
a step of dewatering the wet paper in the press part;
heating the wet paper in the dryer part, and
The manufacturing method includes a step of pressing the heated paper in the calendar part.

Preferably, the droplets contain water.

The paper of the present invention has a colored pattern including a light colored pattern and a dark colored pattern, and the colored pattern is a polka dot pattern in which dark colored dots are dispersed on a light colored background. It is different from.

Furthermore, the paper of the present invention does not require crater-like depressions, and therefore has a smooth surface. Therefore, the paper of the present invention can have excellent printability.

Furthermore, when a pattern is formed by forming crater-like depressions on the surface of wet paper and storing coloring therein, as in the patterned paper described in Patent Document 1, the depressions are deformed when pressed, resulting in the pattern being distorted. Although there is a possibility that the shape of the wafer may change, such inconvenience can be avoided with the present invention.

The smooth paper of the present invention can be suitably used as fancy paper. The smooth paper of the present invention can be used, for example, as high-grade wrapping paper, front and back covers of books, catalogs and pamphlets, calendar paper, and the like.

FIG. 2 is an enlarged conceptual diagram of an example of a non-printed colored pattern on smooth paper according to the present invention.

In the patterned paper described in Patent Document 1, droplets are applied to the surface of the wet paper during paper making with a relatively strong force that changes the cross-sectional shape of the wet paper to create crater-shaped depressions on the surface of the wet paper. However, as a result of intensive study, the present inventors have found that the patterned paper described in Patent Document 1 can be manufactured without forming crater-shaped depressions. The present invention was completed based on the discovery that it is possible to form a pattern different from that of the present invention.

In the present invention, a pattern is formed by scattering droplets on the surface of wet paper during paper making and making the fiber distribution on the surface uneven by the scattering. The formed pattern can be visually recognized by using pre-colored fibers or by coloring the fibers after the pattern is formed. Thereby, it is possible to form a colored pattern including a light color pattern and a dark color pattern, in which the dark color pattern is continuous. Furthermore, in the present invention, there is no need to significantly change the cross-sectional shape of the paper, such as by forming crater-like depressions, so that paper with a smooth surface can be obtained.

That is, the paper of the present invention is made of at least one type of fiber, and although the surface is smooth, the fiber distribution on the surface is uneven, thereby forming a light color pattern and a dark color pattern, and the paper having a smooth surface. It has a colored pattern with a continuous color pattern. For example, the smooth paper of the present invention can have a polka dot pattern with light colored dots dispersed on a dark background.

Hereinafter, the smooth paper of the present invention and its manufacturing method will be explained.

[Smooth paper]
The present invention is a smooth paper comprising at least one type of fiber and having a non-printed colored pattern,
the non-printed colored pattern includes a light color pattern and a dark color pattern;
The present invention relates to a smooth paper in which the dark color pattern is continuous.

The fibers are not particularly limited as long as they can form smooth paper, but natural fibers are preferred, and cellulose fibers are more preferred. Cellulose fibers are hydrophilic fibers that have a stable hydrophilic surface and remain hydrophilic even after wetting. Examples of cellulose fibers include wood pulp fibers such as softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulfite pulp (NBSP), and thermomechanical pulp (TMP); kozo, mitsumata, gampi, etc. bast fibers; non-wood pulp fibers such as straw, bamboo, kenaf, bagasse, etc., and one type of these can be used alone or two or more types can be used in combination. Wood pulp fibers are preferred as cellulose fibers. The content of cellulose fibers is preferably 50% by mass or more, more preferably 60% by mass or more, even more preferably 70% by mass or more, particularly 70 to 100% by mass, based on the total mass of the paper (dry state). preferable.

The fibers may contain fibers other than the cellulose fibers. Examples of other fibers include organic fibers such as recycled fibers such as rayon, acetate, vinylon, nylon, acrylic, and polyester, semi-synthetic fibers, and synthetic fibers, and inorganic fibers such as alumina fibers and alumina silicate fibers. One type can be used alone or two or more types can be used in combination. The content of other fibers is preferably 50% by mass or less, preferably 40% by mass or less, and preferably 30% by mass or less, based on the total mass of the paper.

The smooth paper of the present invention may contain various general-purpose additives such as a sizing agent, a dry paper strength enhancer, a wet paper strength enhancer, and a retention improver in addition to the above-mentioned fibers.

The fibers have at least one color. The color of the fiber may be an achromatic color ranging from white to black, but it is preferably a chromatic color such as deep green. The fiber material itself may be colored, or a coloring agent may be applied to the surface of the fiber.

The smooth paper of the present invention has a non-printed colored pattern. The non-printed colored pattern includes a light color pattern and a dark color pattern, and the dark color pattern is continuous. The term "pattern" as used herein means a region having a visible shape and area that forms a pattern. Therefore, a mere line segment that does not constitute a region is not a "pattern." Furthermore, the term "non-printed colored pattern" as used herein means that the "colored pattern" is not formed by printing. That is, on the surface of the smooth paper of the present invention, there is a colored shading pattern that is not caused by printing, and in this pattern, dark colored parts are continuous.

In the non-printed colored pattern, it is preferable that the fiber density of the dark color pattern is greater than the fiber density of the light color pattern. That is, on the surface of the smooth paper of the present invention, it is preferable that the amount of fibers present per unit area in the dark color pattern is larger than the amount of fibers present per unit area in the light color pattern. This makes it easier to visually recognize the shading of the colored pattern on the surface of the smooth paper of the present invention.

Further, in the non-printed colored pattern, it is preferable that the brightness of the dark color pattern is lower than the brightness of the light color pattern. As a result, the dark color pattern appears to be a darker color, and the light color pattern appears to be a lighter color.

In the non-printed colored pattern, the dark color pattern and/or the light color pattern may be formed by a straight line and/or a curved line, but it is preferable that at least a part thereof is formed by a curved line. That is, for both the dark color pattern and the light color pattern, or for one of the dark color pattern or the light color pattern, it is preferable that at least a part of the pattern is formed by a curve, and all of the pattern is formed by a curve. may be done. Note that although the area formed by the "curve" is a "pattern" in the present invention, the "curve" itself is not a "pattern."

Furthermore, in the non-printed colored pattern, it is preferable that at least a portion of the light-colored pattern is discontinuous. That is, some of the light-colored patterns may be continuous, but it is preferable that some of the light-colored patterns are discontinuous. Note that all of the light-colored patterns may be discontinuous. At least a portion of the discontinuous light-colored pattern may be a closed region surrounded by a single closed curve.

The color of the non-printed colored pattern is not particularly limited, and at least one color can be used as appropriate. When using two or more colors, for example, the color of the dark pattern and the color of the light pattern may be different. On the other hand, the non-printed colored pattern may be of a single color, and in this case, the pattern can be visually recognized by the light and shade of the color by the dark and light patterns.

FIG. 1 is an enlarged conceptual diagram of an example of a non-printed colored pattern on smooth paper according to the present invention. The non-printed colored pattern in FIG. 1 has a single color and is composed of a light color pattern 1 and a dark color pattern 2.

In the example shown in FIG. 1, the light color pattern 1 is discontinuous, and the dark color pattern 2 is continuous. The fiber density of the dark color pattern 2 is greater than the fiber density of the light color pattern 1. In other words, the amount of fibers present per unit area is greater in the region of dark color pattern 2 than in the region of light color pattern 1. Therefore, the dark color pattern 2 is darker than the light color pattern 1, and as shown in FIG. 1, the brightness of the dark color pattern 2 is lower than the brightness of the light color pattern 1. Thereby, in FIG. 1, the pattern formed by the light color pattern 1 against the background of the dark color pattern 2 can be visually recognized as a light color pattern.

In the example shown in FIG. 1, the light color pattern 1 and the dark color pattern 2 are surrounded by curved lines. That is, both the light color pattern 1 and the dark color pattern 2 are formed by curved lines. The light color pattern 1 forms a closed area surrounded by a single closed curve, and forms a type of polka dot pattern in which light color dots are dispersed on a dark background. However, as shown in FIG. 1, the light-colored portions are not perfectly circular dots, and in reality, dots are often randomly distributed without regularity.

In the example shown in FIG. 1, the fiber density at the boundary line between the light-colored pattern 1 and the dark-colored pattern 2 is greater than both the fiber density of the light-colored pattern 1 and the fiber density of the dark-colored pattern 2. Furthermore, although not shown, when the boundary line is enlarged, the fiber density on the light color pattern 1 side is higher and the fiber density on the dark color pattern 2 side is lower, and there is a gradation of fiber density within the boundary line. exists. Thereby, the outline of the light-colored pattern 1 can be made clearer.

The paper of the present invention has a smooth surface. Regarding the surface roughness of the smooth paper of the present invention, the arithmetic mean roughness measured with a stylus type surface roughness tester specified in JIS B 0610 is preferably 4.0 μm or less, more preferably 3.5 μm or less. , 3.0 μm or less is even more preferable.

The paper of the present invention preferably has a smoothness according to JIS P8119 of 10 seconds or more, more preferably 15 seconds or more, and even more preferably 20 seconds or more. In the measurement, it is preferable to pre-treat the sample at 23° C. and 50% relative humidity for 4 hours or more in accordance with JIS-P8111 (1998).

The basis weight of the smooth paper of the present invention is preferably in the range of 60 to 300 g/m ² , more preferably 70 to 290 g/m ² , even more preferably 80 to 280 g/m ² .

Note that the smooth paper of the present invention may have other patterns as long as it has a non-printed colored pattern that includes a light color pattern and a dark color pattern and the dark color pattern is continuous. Other patterns may also be formed by printing. For example, various images may be formed on at least a portion of the surface of the smooth paper of the present invention by printing.

[Method for manufacturing smooth paper]
The invention also relates to a method for producing smooth paper consisting of at least one fiber and having a non-printed colored pattern, using a paper machine with at least a wire part, a press part, a dryer part and a calender part.

The non-printed colored pattern may include a light color pattern and a dark color pattern, and the dark color pattern may be continuous. The term "pattern" as used herein means a region having a visible shape and area that forms a pattern. Therefore, a mere line segment that does not constitute a region is not a "pattern." Furthermore, the term "non-printed colored pattern" as used herein means that the "colored pattern" is not formed by printing. That is, on the surface of the smooth paper obtained by the manufacturing method of the present invention, a colored shading pattern that is not caused by printing can be formed, and in the pattern, dark colored parts can be continuous.

The method for producing smooth paper according to the present invention can be carried out using a paper machine well known in the paper manufacturing field. The paper machine has at least four parts: a wire part that forms wet paper from paper raw materials, a press part that dehydrates the wet paper, a dryer part that heats the dehydrated wet paper, and a calendar part that presses the heated wet paper. There is no particular limitation as long as it has two parts; for example, a fourdrinier type, hybrid type, or gap type former is combined with an air cushion type head box or hydraulic type head box. Various known paper machines such as paper machines can be used.

The first aspect of the manufacturing method of the present invention is
a step of forming wet paper in the wire part;
a step of scattering droplets on the surface of the wet paper to make the fiber distribution uneven on the surface;
The process of dehydrating wet paper in the press part,
heating the wet paper in a dryer part, and
Including the process of pressing the paper after heating in the calendar part,
Furthermore, the method includes a step of coloring the wet paper or paper.

The step of forming a wet paper web in the wire part can be carried out by means well known in the paper manufacturing field. For example, the process can be carried out by dispensing a slurry of fibers, preferably natural fibers, more preferably cellulose fibers, onto a variety of screens to form a wet paper web.

The step of distributing droplets on the surface of the wet paper to make the fiber distribution uneven on the surface can be carried out using any means capable of dispersing droplets on the surface of the wet paper, but for example, , can be carried out by spraying droplets from a shower nozzle.

The droplet preferably contains water, and more preferably consists only of water. That is, it is more preferable to use water droplets as the liquid droplets.

In the manufacturing method of the present invention, a pattern is formed by spraying droplets on the surface of wet paper during paper making, and making the fiber distribution on the surface uneven by the spraying. Specifically, the fibers are pushed away from the areas of the wet paper surface that are hit by the droplets, making the fiber distribution on the wet paper surface uneven, and typically, the fiber density of the areas of the wet paper web that are hit by the droplets is reduced. decreases. On the other hand, the fiber density of the portions of the wet paper surface that were not hit by the droplets did not change. Therefore, the fiber density of the portion of the wet paper web surface that is hit by the droplet is smaller than the fiber density of the portion that is not hit by the droplet. As a result, the portions hit by the droplets form a light-colored pattern, and the areas not hit by the droplets form a dark-colored pattern.

In the manufacturing method of the present invention, by adjusting the way droplets are applied to the wet paper, a pattern can be formed on the wet paper without forming crater-like depressions on the wet paper. Specifically, for example, by controlling the shape and number of the discharge openings of the shower nozzle that sprays droplets, the distance from the wet paper, the angle of the direction of travel of the droplets relative to the wet paper, the liquid pressure, etc. You can adjust how the droplets are applied.

Note that the fibers that are pushed away at the portion of the wet paper web surface that is hit by the droplet can be deposited around that portion to form a boundary line of the light-colored pattern. In addition, more of the displaced fibers are deposited on the side closer to the light-colored pattern, so at the boundary line, the fiber density is higher on the light-colored pattern side and lower on the dark-colored pattern side. There is a gradation of fiber density in the line. Thereby, the outline of the light-colored pattern can be made clearer.

The step of dewatering the wet paper in the press part can be carried out using, for example, a press roll, felt, etc. well known in the paper manufacturing field. As a result, the moisture content of the wet paper web can be set to, for example, 50 to 60% by mass based on the mass of the wet paper paper.

The step of heating the wet paper in the dryer part can be carried out using, for example, a multi-barrel dryer, a Yankee dryer, etc., which are well known in the paper manufacturing field. This reduces the moisture content of the wet paper and dries the wet paper. Note that the wet paper paper does not need to be completely dried, and the moisture content of the wet paper paper can be, for example, 5 to 10% by mass based on the mass of the wet paper paper.

The step of pressing the paper after heating in the calender part can be carried out using, for example, a calender roll or the like well known in the paper manufacturing field. Through this step, the manufacturing method of the present invention can manufacture paper with a smooth surface.

The step of coloring the wet paper or paper can be carried out, for example, by applying a coloring liquid containing dyes, pigments, etc. to the surface of the wet paper on which a pattern is formed.

In this example, the wet paper is colored after forming a pattern on the surface by scattering droplets on the surface of the wet paper to make the fiber distribution uneven on the surface. Colored ones can be used.

The step of coloring the wet paper or paper does not need to be carried out immediately after the step of distributing droplets on the surface of the wet paper to make the fiber distribution uneven on the surface. For example, the step of coloring the wet paper web or paper may be performed immediately before the step of dispersing droplets on the surface of the wet paper web to make the fiber distribution uneven on the surface. Further, the step of coloring the wet paper or paper may be performed after the step of dehydrating the wet paper in the press part or the step of heating the wet paper in the dryer part, which will be described later.

On the other hand, the step of coloring the wet paper or paper may be performed, for example, after the step of pressing the heated paper in the calendar part.

If the patterned paper described in Patent Document 1 has crater-shaped depressions on its surface at the wet paper stage, the depressions will be pressed and deformed by the calendar part, so the shape of the pattern may change. In the paper obtained by the manufacturing method of the present invention, the pattern is formed not by crater-like depressions but by non-uniform fiber distribution, and this non-uniformity does not change even when pressed with a calendar part, so the shape is stable. It is possible to form a pattern.

The second aspect of the manufacturing method of the present invention is
forming a wet paper in the wire part;
a step of scattering droplets on the surface of the wet paper to make the fiber distribution uneven on the surface;
a step of dewatering the wet paper in the press part;
heating the wet paper in the dryer part, and
A step of pressing the paper after heating in the calendar part,
The droplets contain at least one colorant. As the colorant, known dyes, pigments, etc. can be used.

Each step in the second embodiment can be performed as described in the first embodiment. In the second aspect, the droplets used in the step of dispersing droplets on the surface of the wet paper to make the fiber distribution on the surface uneven are colored, so the fiber distribution in the unevenening step is It is possible to make the fibers non-uniform and color the fibers at the same time, resulting in excellent manufacturing efficiency.

In this second embodiment as well, uncolored fibers can be used as the raw material fibers.

A third aspect of the manufacturing method of the present invention uses a paper machine equipped with at least a wire part, a press part, a dryer part, and a calendar part, and at least one colored fiber,
a step of forming wet paper in the wire part;
a step of scattering droplets on the surface of the wet paper to make the fiber distribution uneven on the surface;
The process of dehydrating wet paper in the press part,
heating the wet paper in a dryer part, and
It includes the step of pressing the paper after heating in the calendar part.

Each step in the third embodiment can be performed as described in the first embodiment. However, in the third embodiment, colored fibers are used, so the wet paper formed from the wire part is already colored. Therefore, a wet paper or paper coloring step is not essential.

In the manufacturing method of the present invention, a size press part may be provided for performing a size press for coating the surface of paper, if necessary. The size press part can be provided, for example, after the dryer part.

In addition, in the method for manufacturing patterned paper described in Patent Document 1, the colorant is stored in the crater-shaped depression in the size pressing process, so it is necessary to maintain the shape of the depression at least until the size pressing process is completed. In the size pressing step, since it is necessary to maintain the crater-like depression, the paper is not pressed to the extent that it is compressed. Therefore, smooth paper cannot be obtained as is. Further, even if the paper is pressed in a calendar part after the size press step, it may be difficult to improve the surface smoothness of the paper after pressing because the original paper has large irregularities.

On the other hand, in the manufacturing method of the present invention, there is no need to maintain such crater-like depressions, so paper with high smoothness can be obtained.

Hereinafter, the present invention will be explained in more detail using Examples, but the scope of the present invention is not limited to the Examples.

[Example 1]
A pulp consisting of 40 parts by mass of softwood bleached kraft pulp (NBKP) and 60 parts by mass of hardwood bleached kraft pulp was beaten to 380mlC.SF, and a paper strength enhancer (trade name "Polystron 191" manufactured by Arakawa Chemical Industries, Ltd. ), 1.0 parts by mass of a sizing agent (trade name "Size Pine E" manufactured by Arakawa Chemical Industry Co., Ltd.), and 3.0 parts by mass of sulfuric acid were added to prepare raw materials. Add 0.14 parts by mass of "Kayafect Blue GT" (Nippon Kayaku Co., Ltd.) and 0.16 parts by mass of another dye (product name "Direct Paper Yellow RL" manufactured by Nihon Kagaku Kogyo Co., Ltd.) to adjust the color to green. A colored raw material was obtained.

Using a paper machine (Fourdrinier paper machine) equipped with a wire part, a press part, a dryer part, and a calendar part, the colored raw material was made into paper with a basis weight of 100 g/m ² . During this papermaking, water was sprayed onto the wet paper on the wire part from a height of 350 mm from the wet paper using a spray device in which 24 fluid fluid nozzles were arranged at intervals of 50 mm in the width direction. In order to create a continuous irregular pattern evenly, the angle of the droplet's traveling direction relative to the wet paper was adjusted to 30°, and the flow rate was adjusted to 30L/min to make the droplet an appropriate size. A wet paper with non-uniform fiber distribution was obtained. Furthermore, patterned paper was manufactured through a press part, a dryer part, and a calendar part.

The surface of the manufactured patterned paper was smooth and had a pattern including an irregular light-colored pattern and an irregular dark-colored pattern, and the dark-colored pattern was continuous. The light-colored pattern consisted of a closed area partially surrounded by a closed curve, and was discontinuous.

Claims (13)

A smooth paper comprising at least one type of fiber and having a non-printed colored pattern,
the non-printed colored pattern includes a light color pattern and a dark color pattern;
The fiber density of the dark color pattern is greater than the fiber density of the light color pattern,
The dark color pattern is continuous,
Smooth paper having an arithmetic mean roughness of 4.0 μm or less according to JIS B0601 . The smooth paper of claim 1, wherein the fibers include at least one natural fiber. The smooth paper according to claim 1 or 2, wherein the brightness of the dark color pattern is lower than the brightness of the light color pattern. The smooth paper according to any one of claims 1 to 3, wherein at least a portion of the dark color pattern and/or the light color pattern is formed by a curved line. The smooth paper according to any one of claims 1 to 4, wherein at least a portion of the light-colored pattern is discontinuous. 6. The smooth paper of claim 5, wherein at least a portion of the discontinuous light colored pattern is a closed area surrounded by a single closed curve. Smooth paper according to any one of claims 1 to 6, wherein the color is a single color. The smooth paper according to any one of claims 1 to 7 , having a smoothness of 10 seconds or more according to JIS P8119. The smooth paper according to any one of claims 1 to 8 , having a basis weight of 60 to 300 g/m ² . It is made of at least one type of fiber using a paper machine equipped with at least a wire part, a press part, a dryer part, and a calender part, and includes a light color pattern and a dark color pattern, and the fiber density of the dark color pattern is the fiber density of the light color pattern. A method for producing a smooth paper having a non-printed colored pattern larger than 100 ml and having a continuous dark colored pattern, the method comprising:
forming a wet paper in the wire part;
a step of scattering droplets on the surface of the wet paper to make the fiber distribution uneven on the surface;
a step of dewatering the wet paper in the press part;
heating the wet paper in the dryer part, and
A step of pressing the paper after heating in the calendar part,
The manufacturing method further includes a step of coloring the wet paper or paper. It is made of at least one type of fiber using a paper machine equipped with at least a wire part, a press part, a dryer part, and a calender part, and includes a light color pattern and a dark color pattern, and the fiber density of the dark color pattern is the fiber density of the light color pattern. A method for producing a smooth paper having a non-printed colored pattern larger than 100 ml and having a continuous dark colored pattern, the method comprising:
forming a wet paper in the wire part;
a step of scattering droplets on the surface of the wet paper to make the fiber distribution uneven on the surface;
a step of dewatering the wet paper in the press part;
heating the wet paper in the dryer part, and
A step of pressing the paper after heating in the calendar part,
A method of manufacturing, wherein the droplets include at least one colorant. A paper machine with at least a wire part, a press part, a dryer part, and a calender part is used, the fiber is made of at least one type of colored fiber, and includes a light color pattern and a dark color pattern, and the fiber density of the dark color pattern is a light color pattern. A method for producing smooth paper having a non-printing colored pattern that is larger than the density and has a continuous dark color pattern, the method comprising:
forming a wet paper in the wire part;
a step of scattering droplets on the surface of the wet paper to make the fiber distribution uneven on the surface;
a step of dewatering the wet paper in the press part;
heating the wet paper in the dryer part, and
A manufacturing method comprising the step of pressing the paper after heating in the calendar part. The manufacturing method according to any one of claims 10 to 12 , wherein the droplets contain water.

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