JP7648485B2 - Printed paper, unprinted base paper, method for producing unprinted base paper, and papermaking net - Google Patents

Description

The present invention relates to improving the manufacturing efficiency of paper for printed matter having watermarks, etc.

Watermarks are known as a technique for preventing counterfeiting of printed materials such as gift certificates. A watermark is a pattern that appears when you look through the paper on which it is applied. Known types of watermarks are "white watermarks," where the pattern is visible through the paper, and "black watermarks," where the pattern appears darker than the surrounding area.

These watermark patterns are usually formed by partially changing the basis weight of constituent fibers such as pulp fibers during the wet paper formation stage (wire part) in wet papermaking. For example, when a papermaking net with wire holes filled in a pattern is used in the wire part, the parts of the wet paper corresponding to the patterned parts where the wire holes are filled are shaped to be thinner than the surrounding parts, with less paper stock, and the shaped parts become white watermarks in the paper obtained by drying the wet paper. Also, when a papermaking net with a concave pattern is used, the parts of the wet paper corresponding to the concave pattern are shaped to be thicker than the surrounding parts, and the shaped parts become black watermarks in the paper obtained by drying the wet paper.

There is also a type of watermark known as a pseudo watermark (chemical watermark). A pseudo watermark is formed by printing a sheet with a substance that penetrates into a sheet such as paper and increases its light transmittance, for example, ink made by dissolving a transparent synthetic resin in a solvent. The printed area where the ink is applied becomes a watermark, and has the same visual effect as a white watermark.

Meanwhile, Utility Model Registration No. 3028886 discloses another anti-counterfeiting technique in which a paper layer with a window (opening) is laminated with a paper layer without a window, and a thread is inserted into the window area.

Utility Model Registration No. 3028886

Paper for printed items such as gift certificates with watermarks is produced by wet papermaking and then wound into a roll, or cut into flat pieces of paper of a certain size using a cutting device and then stacked for shipping. Hereinafter, paper wound into a roll will be referred to as "continuous paper," and paper cut into flat pieces will be referred to as "discontinuous paper." Note that while continuous paper is suitable for mass production, discontinuous paper can also be used for small-scale production.

Conventionally, for paper with watermarks, the papermaking mesh for wet-processing of continuous paper and the papermaking mesh for wet-processing of discontinuous paper were different, and it was necessary to change the papermaking mesh when switching the form of the paper to be manufactured, such as from continuous paper to discontinuous paper, or from discontinuous paper to continuous paper.

When replacing the papermaking mesh, the paper production line had to be stopped temporarily, which required time to adjust the papermaking conditions, resulting in a decrease in yield. Depending on the circumstances of the papermaking condition adjustments, the yield could drop significantly. Furthermore, a different papermaking mesh had to be made, which increased the time and cost required to make the papermaking mesh.

The present invention aims to solve the above problems. Specifically, the present invention aims to improve the manufacturing efficiency of paper for printed matter with watermarks, etc.

As a result of extensive research, the inventors discovered that by devising a printing layout for printed matter, it is possible to produce both continuous and discontinuous paper using a single papermaking machine, and thus completed the present invention.

The first aspect of the present invention is a method for producing a cellular membrane comprising the steps of:
It has a margin along the periphery,
a plurality of spaced apart printed surfaces on a surface other than the margins;
The printing surfaces each include a cross-sectional shape varying region,
The printing paper is in the form of continuous or discontinuous paper, with the spacing between the printing surfaces being wider than the width of the margins.

It is preferable that the printing surface is rectangular.

It is preferable that the spacing is at least twice the width of the margin.

The light transmittance of the cross-sectional shape variation region may be different from the light transmittance of the printed surface outside the cross-sectional shape variation region.

The color of the cross-sectional shape variation region may be different from the color of the printed surface outside the cross-sectional shape variation region.

It is preferable that the cross-sectional shape variation region is a watermark or a window.

The printing paper of the present invention may have an embossed surface.

The printing paper of the present invention may have threads.

The printed paper of the present invention is preferably anti-counterfeit paper.

The second aspect of the present invention is unprinted base paper prior to printing of the printed paper of the first aspect of the present invention.

The unprinted base paper may be either single-ply or multi-ply paper.

The unprinted base paper may be a multi-layered paper.

A third aspect of the present invention is a method for producing an unprinted base paper according to the second aspect of the present invention, comprising the steps of:
A wet papermaking process for obtaining a wet paper by wet papermaking using a papermaking net having a surface including a plurality of separated net cross-sectional shape change regions or net water permeability change regions capable of forming the cross-sectional shape change region;
A drying step of drying the wet paper to obtain a base paper;
The method includes at least a cutting step of cutting the base paper,
This is a method for producing unprinted base paper, in which unprinted base paper in the form of continuous paper or discontinuous paper is selectively produced by selecting the cutting portion of the base paper in the cutting step, without replacing the papermaking mesh.

It is preferable that the manufacturing method includes a pressing step of pressing the wet paper after the wet papermaking step and before the drying step.

A fourth aspect of the present invention is a method for manufacturing a lid comprising:
a plurality of spaced apart printed surfaces on a surface other than the margins;
The printing surfaces each include a cross-sectional shape varying region,
A papermaking net for wet-processing of unprinted base paper for printing paper in the form of continuous or discontinuous paper, the spacing between the printing surfaces being wider than the width of the margins,
A plurality of mesh cross-sectional shape change regions or mesh water permeability change regions are provided at positions on the surface of the papermaking mesh where the cross-sectional shape change regions can be formed,
It is a papermaking system for wet papermaking that can produce both unprinted base paper in the form of continuous or discontinuous paper.

In the present invention, by devising a printing layout for printed matter having regions of varying cross-sectional shape such as watermarks, it is possible to produce both continuous and discontinuous paper using a single papermaking network.

In other words, the printed paper of the present invention, which has a cross-sectional shape variation region such as a watermark, has a predetermined printing layout, and therefore, unprinted base paper before printing can be manufactured using a single papermaking network, regardless of whether the base paper is in the form of continuous paper or discontinuous paper.

Therefore, in the present invention, there is no need to replace the papermaking mesh when switching the form of the unprinted base paper to be manufactured, such as from continuous paper to discontinuous paper, or from discontinuous paper to continuous paper.

Therefore, when switching the form of the paper being manufactured between continuous and discontinuous paper, there is no need to stop the production line to replace the papermaking net, and there is no need to readjust the papermaking conditions. Furthermore, since production can be continued under the same papermaking conditions, the yield is improved. Furthermore, since there is no need to prepare a different papermaking net, the time and cost required for preparing the papermaking net is unnecessary.

In this way, the present invention can improve the manufacturing efficiency of paper for printed materials with watermarks, etc.

FIG. 2 is a diagram showing one embodiment of a print layout of a printing paper of the present invention. 11A to 11C are diagrams showing other aspects of the print layout of the printing paper of the present invention. 3 is an example of a base paper that is a source of the unprinted base paper before printing on the printed paper in FIGS. 1 and 2 . FIG. 2 is a diagram showing an example of a wet papermaking process using a papermaking net having a net water impermeable region as a net water permeability varying region.

The present invention is characterized by devising the printing layout of the printed matter, rather than the paper manufacturing process itself, in order to improve the manufacturing efficiency of paper for printed matter having areas of cross-sectional shape variation such as watermarks. This makes it possible to manufacture both continuous and discontinuous paper by appropriately selecting the cutting mode of the manufactured paper without varying the paper manufacturing process.

The following describes the aspects of the present invention, namely, the printed paper, the unprinted base paper, the method for producing the unprinted base paper, and the papermaking net.

[Printing paper]
The printing paper of the present invention is
It has a margin along the periphery,
a plurality of spaced apart printed surfaces on a surface other than the margins;
The printing surfaces each include a cross-sectional shape varying region,
The paper may be in the form of continuous or discontinuous paper, with the spacing between the printing surfaces being wider than the width of the margins.

In this invention, "printed paper" means paper on which printing has been applied.

Figure 1 shows one embodiment of the printing layout of the printing paper of the present invention.

Specifically, FIG. 1 is a top view showing the printing layout of printed paper 1, which is in the form of discontinuous paper, and multiple printed surfaces 2 are printed from bottom to top as indicated by the arrow at the left end of FIG. 1. The printed surfaces 2 are printing units, and the printing designs of each printed surface 2 may be the same or different, but are preferably the same. There are no particular limitations on the printing method. The printed paper 1 in FIG. 1 is in a flat form and can be shipped stacked.

The printed paper 1 has multiple printing surfaces 2 and margins 3. The margins 3 are present on the periphery of the printed paper 1, and the printed surfaces 2 are present on the surface of the printed paper 1 other than the margins 3. In the example of Figure 1, the margins 3 are present along the entire periphery of the printed paper 1, and have a predetermined width m in the width direction of the printed paper 1 (left-right direction in Figure 1).

In the example of Figure 1, there are three printing surfaces 2 in the width direction of the printing paper 1 (left and right direction in Figure 1), and six printing surfaces 2 along the length direction of the printing paper 1 (up and down direction in Figure 1). The shape of the printing surfaces 2 is not particularly limited, but in the example of Figure 1, the printing surfaces 2 are rectangular. In this invention, "rectangle" means a quadrangle with all four equal corners, and includes both squares and rectangles. In addition, there are gaps 4 with a predetermined width S between the printing surfaces 2, and each printing surface 2 is separated from each other. No printing is performed in the gaps 4.

In the present invention, the spacing between the printed surfaces is wider than the width of the margins. Thus, in the example of FIG. 1, the width S of the spacing 4 is wider than the width m of the margins 3. In the present invention, it is preferable that the spacing between the printed surfaces is at least twice the width of the margins. In the example of FIG. 1, the width S is twice the width m.

In the present invention, each printed surface includes a cross-sectional shape variation region. Thus, in the example of FIG. 1, each printed surface 2 includes at least one cross-sectional shape variation region 5. Here, "include" means that at least a portion of the cross-sectional shape variation region 5 is included in the printed surface 2, and it is not necessary for all of the cross-sectional shape variation region 5 to be included in the printed surface 2, but all of the cross-sectional shape variation region 5 may be included in the printed surface 2. It is preferable that the area of the cross-sectional shape variation region 5 is smaller than the area of the printed surface 2.

In the present invention, a cross-sectional shape variation region is a region in which the cross-sectional shape of the printed paper varies, and for example, in a cross-sectional shape variation region, the thickness of the cross-section of the printed paper is decreased or increased compared to the thickness of other regions, or the thickness of the cross-section of the printed paper does not vary (does not decrease or increase) compared to the thickness of other regions, but has a bent portion, such as a wave shape.

In the example of Figure 1, there are three rows of cross-sectional shape variation regions 5 in the width direction of the printed paper 1, and in each row, multiple cross-sectional shape variation regions 5 exist independently, separated from each other. In the example of Figure 1, three rows of multiple cross-sectional shape variation regions 5 are parallel. Each printed surface 2 includes a cross-sectional shape variation region 5. It is sufficient for each printed surface 2 to include one or more cross-sectional shape variation regions 5, and each printed surface 2 may include multiple cross-sectional shape variation regions 5 as shown in Figure 1.

The light transmittance of the cross-sectional shape variation region 5 can be different from the light transmittance of the printed surface 2 outside the cross-sectional shape variation region 5. For example, the cross-sectional shape variation region 5 can be a watermark. The watermark can be formed by a method known in the art. The watermark can be either a white watermark or a black watermark. Note that a pseudo-watermark in which the cross-sectional shape of the printed paper 1 does not vary does not correspond to the cross-sectional shape variation region 5.

When the printed paper 1 is made up of two or more paper layers, the cross-sectional shape variation region 5 may be a window (opening). In other words, by stacking a paper layer with a window and a paper layer without a window, the cross-sectional shape variation region 5 can be made into a window.

The color of the cross-sectional shape variation region 5 may be different from the color of the printing surface 2 outside the cross-sectional shape variation region 5. This makes it possible, for example, to make the cross-sectional shape variation region 5 easier to see.

The color of the cross-sectional shape variation region 5 may be imparted by printing, but it may also be imparted by coloring the paper itself. For example, if the printed paper 1 is made up of multiple paper layers and the cross-sectional shape variation region 5 is formed by one paper layer, the color of that paper layer can be made different from the colors of the other paper layers by coloring that paper layer to make the color of that paper layer different from the colors of the other paper layers, thereby making the color of the cross-sectional shape variation region 5 different from the colors of the other regions.

The colorant used for coloring is not particularly limited, but is preferably a dye and/or a pigment. In addition, the dye may be a fluorescent dye, and the pigment may be a fluorescent pigment.

The printed paper 1 may have embossments and/or threads. The embossments and/or threads are preferably present in the cross-sectional shape variation region 5. For example, the threads are preferably present in a watermark or window. The cross-sectional shape variation region 5 may be formed by embossments.

Examples of threads include films printed with holograms, micro-characters, and multi-layer interference films, which are commonly used for anti-counterfeiting purposes.

As a film for the thread, any film commonly used for anti-counterfeiting purposes, such as a metallic gloss film, a colored film, a magnetic film, or a fluorescent film, can be used. It is preferable to apply a heat-sensitive adhesive to the thread so that the thread and the paper layer are bonded by the heat in the drying process after wet papermaking.

The shape of the thread is not particularly limited, but if the thread is approximately rectangular, the width of the thread can be, for example, 0.3 to 10 mm, and the thickness can be, for example, 12 μm to 50 μm.

An embossment can be formed, for example, by pressing a mold or equivalent object having concave and/or convex shapes into the paper.

The location of the embossments and/or threads on the printing paper 1 is not particularly limited, but it is preferable that they are present in the cross-sectional shape variation region 5.

The printed paper 1 can be anti-counterfeit paper. Anti-counterfeit paper can be suitably used for, for example, banknotes, gift certificates, admission tickets, passports, securities, etc. The printed surface 2 can be the face of a gift certificate or the like. When the printed paper 1 has threads, and when the cross-sectional shape variation region 5 is a watermark or window, the printed paper of the present invention is particularly suitable as anti-counterfeit paper.

Figure 2 shows another embodiment of the printing layout of the printing paper of the present invention.

Specifically, FIG. 2 is a top view showing the printing layout of the printing paper 1, which is in the form of continuous paper, and printing is performed from bottom to top as indicated by the arrow at the left end of FIG. 2. There are no particular limitations on the printing method. The printing paper 1 in FIG. 2 can be shipped in the form of a roll.

The printed paper 1 in FIG. 2 differs from the printed paper 1 in FIG. 1 in that there are two printed surfaces 2 in the width direction (left-right direction in FIG. 2). For convenience, six printed surfaces 2 are shown in the vertical direction in FIG. 2, but in reality, the vertical direction in FIG. 2 is continuous.

In addition, in the printed paper 1 of FIG. 2, there are two rows of cross-sectional shape variation regions 5 in the width direction of the printed paper 1, and in each row, multiple cross-sectional shape variation regions 5 exist independently and at a distance from each other. In the example of FIG. 2, two rows of multiple cross-sectional shape variation regions 5 are parallel, and each printed surface 2 includes a cross-sectional shape variation region 5.

In all other respects, the printed paper 1 in Figure 2 is the same as the printed paper 1 in Figure 1. For example, in the example of Figure 2, the width S of the space 4 on the printed surface 2 is wider than the width m of the margin 3, and in the example of Figure 2, the width S is twice the width m.

The printed paper in the form of discontinuous paper in Figure 1 and the printed paper in the form of continuous paper in Figure 2 can be obtained by printing unprinted base paper in the form of discontinuous paper and unprinted base paper in the form of continuous paper, respectively.

In this invention, "unprinted base paper" means paper before printing is applied.

[Unprinted base paper]
The unprinted base paper in the discontinuous form and the unprinted base paper in the continuous form can be produced from a common base paper.

Figure 3 shows an example of base paper 1', which is the source of the unprinted base paper before printing of the printed paper 1 in Figures 1 and 2. The direction of the arrow at the bottom of Figure 3 corresponds to the direction of the arrow at the left end in Figures 1 and 2. The base paper 1' in Figure 3 is continuous paper in the form of a roll that can be unwound in the direction of the arrow in Figure 3.

The base paper 1' in Figure 3 is not actually printed, but for the sake of convenience in explaining the correspondence with the printed paper 1 in Figures 1 and 2, the printing layout of the printing to be applied to the printed paper 1 in Figures 1 and 2 is shown superimposed.

In Figure 3, P and R are cutting lines corresponding to a straight line extending along the center of interval 4.

In the base paper 1' in Figure 3, there are six printing surfaces 2 in the width direction (the vertical direction in Figure 3). Therefore, if the base paper 1' is cut at the cutting line P and then further cut in the vertical direction at the right end of Figure 3 so that six printing surfaces 2 are included in the horizontal direction of Figure 3, it will become the unprinted base paper for the printed paper in Figure 1, while cutting at the two cutting lines R will result in the unprinted base paper for the printed paper in Figure 2.

In the example of Figure 3, the cutting lines P and R correspond to a straight line extending along the center of the space 4 (which has twice the width of the margin 3) in the print layout shown in Figures 1 and 2, so when the base paper 1' is cut along the cutting line P or R, the cut space 4 becomes the new margin 3 as is. On the other hand, if the space 4 in the print layout is more than twice the width of the margin 3, the cutting lines P and R can be, for example, two cutting lines, and the position of each cutting line can be adjusted so that the width of the new margin created by cutting along each cutting line is the same as the width of the existing margin.

The base paper 1' contains a paper stock. Typically, the paper stock contains cellulose fibers. Examples of cellulose fibers include wood pulps such as bleached softwood kraft pulp (NBKP), bleached hardwood kraft pulp (LBKP), bleached softwood sulfite pulp (NBSP), and thermomechanical pulp (TMP); non-wood pulps such as hemp, bamboo, straw, kenaf, mitsumata, kozo, and cotton; modified pulps such as cationic pulp and mercerized pulp; and cellulose fibers or regenerated cellulose fibers derived from rayon, etc., and these can be used alone or in combination of two or more.

The paper stock may contain other components in addition to cellulose fibers. Examples of other components include synthetic fibers made of resins such as polyethylene, polypropylene, and polyethylene terephthalate; paper strength enhancers or fixing agents such as starch, polyacrylamide, and polyamine polyamide epichlorohydrin; sizing agents, fillers, drainage yield enhancers, water resistance agents, fixing agents, defoamers, and slime control agents; and these can be used alone or in combination of two or more.

The base paper 1' may be either a single-ply paper or a multi-ply paper. A single-ply paper consists of only one paper layer. A multi-ply paper has multiple layers. Examples of multi-ply paper include one with one paper layer and another layer, two or more paper layers, and two or more paper layers and another layer. An example of the other layer is a coating layer. The coating layer may be present on one surface of the paper or on both surfaces.

The coating layer usually contains a filler and an adhesive. As the filler for the coating layer, fillers usually contained in the coating layer can be used without any particular limitation, and examples thereof include inorganic pigments such as clay, kaolin, silica, talc, aluminum hydroxide, titanium oxide, light calcium carbonate, heavy calcium carbonate, barium sulfate, zinc oxide, satin white, calcium sulfate, etc.; organic pigments such as plastic pigments, etc., and these can be used alone or in combination of two or more. Light calcium carbonate may be either calcite or aragonite, and may be acicular, columnar, spindle-shaped, spherical, cubic, or rosette-shaped. Among these fillers for the coating layer, calcium carbonate is particularly preferred because it is inexpensive and has a high whiteness. The content of the filler in the coating layer is not particularly limited, but it can be used appropriately in the range of preferably 10 to 100% by mass in terms of solid content relative to the total mass of the coating layer.

As the adhesive for the coating layer, water-dispersible or water-soluble adhesives that are usually contained in the coating layer can be used without any particular restrictions, and these can be used alone or in combination of two or more. Examples of water-dispersible adhesives include conjugated diene copolymer latexes such as styrene-butadiene copolymer latex, methyl methacrylate-butadiene copolymer latex, and styrene-methyl methacrylate-butadiene copolymer latex, acrylic polymer latexes such as polymer or copolymer latexes of acrylic acid esters and/or methacrylic acid esters, vinyl polymer latexes such as ethylene-vinyl acetate polymer latex, and polymer or copolymer latexes obtained by modifying these various polymer latexes with functional group-containing monomers such as carboxyl groups. Examples of water-soluble adhesives include starches such as polyvinyl alcohol, oxidized starch, cationic starch, esterified starch, and dextrin. The amount of adhesive contained in the coating layer is not particularly limited, but it can be used appropriately in the range of preferably 5 to 50 parts by mass, calculated as solid content, per 100 parts by mass of all fillers in the coating layer.

The coating layer can contain other components than the filler and adhesive, such as various agents that are usually contained in this type of coating layer to improve the coating suitability. In particular, it is preferable for the coating layer to contain a surfactant. In particular, when coating a paper layer with unevenness, the leveling ability of the coating liquid is further improved, allowing for contour coating that follows the unevenness of the paper layer. Therefore, by having the coating layer contain a surfactant, it is possible to further improve the printing uniformity of the printed paper.

The base paper 1' may be a multi-layered paper. A multi-layered paper has multiple paper layers and can be produced by combining the multiple paper layers. One of the paper layers may have a window (opening). The method of combining the paper layers is not particularly limited, but for example, a multi-chamber cylinder paper machine can be used.

When threads are to be present in the windows, for example, when a combined paper consisting of at least two layers, an outermost paper layer and an inner paper layer, is manufactured using a multi-chamber cylinder paper machine, window openings can be intermittently formed in the outermost paper layer (or the inner paper layer), and the threads can be inserted between the paper layers just before overlapping this with the inner paper layer (or the outermost paper layer) that does not have window openings, so that the threads are exposed from the window openings.

[Method of manufacturing unprinted base paper]
The unprinted base paper of the present invention can be produced by wet papermaking.

Specifically, the unprinted base paper of the present invention is a wet papermaking process for obtaining a wet paper by wet papermaking using a papermaking net having a surface including a plurality of separated net cross-sectional shape change regions or net water permeability change regions capable of forming the cross-sectional shape change region;
A drying step of drying the wet paper to obtain a base paper;
The method includes at least a cutting step of cutting the base paper,
By selecting the cutting portion of the base paper in the cutting step, unprinted base paper in the form of continuous paper or discontinuous paper can be selectively produced by a production method without replacing the papermaking screen.

The wet papermaking process corresponds to the wet paper formation stage (wire part) in normal wet papermaking.

The mesh cross-sectional shape variation region or mesh water permeability variation region present on the surface of the papermaking mesh used in the wet papermaking process forms the cross-sectional shape variation region in the printed paper or unprinted base paper of the present invention.

The mesh cross-sectional shape variation region is a region in which the cross-sectional shape of the papermaking mesh varies compared to other regions, and in the region in which the cross-sectional shape varies so as to protrude from the inside of the papermaking mesh toward the outside, less paper stock accumulates on the papermaking mesh surface compared to other regions, forming a white watermark. On the other hand, in the region in which the cross-sectional shape varies so as to recess from the outside of the papermaking mesh toward the inside, more paper stock accumulates on the papermaking mesh surface compared to other regions, forming a black watermark.

The mesh water permeability variable region is a region in which the water permeability of the papermaking mesh varies compared to other regions, and can be, for example, less water permeable or water impermeable compared to other regions. For example, a water impermeable region can be formed on the surface of the papermaking mesh by filling a resin in a specific portion of the papermaking mesh to block the mesh. Since paper material does not accumulate in the water impermeable region, a window (opening) can be formed in the region. A water impermeable resin plate of a specific shape can be attached to a specific portion of the papermaking mesh.

Figure 4 shows an example of a wet papermaking process that uses a papermaking net with a water-impermeable region as a variable water-permeability region.

The wet papermaking process shown in Figure 4 uses a two-chamber cylinder papermaking machine. The two-chamber cylinder papermaking machine in Figure 4 consists of a first chamber 6 having a first cylinder 6a with a normal papermaking mesh, and a second chamber 7 having a second cylinder 7a with a papermaking mesh with a mesh water-impermeable area.

In the wet papermaking process shown in FIG. 4, a normal first paper layer 1a is formed in the first tank 6 and transferred onto the blanket 8. Next, threads 9 are provided on the surface of the first paper layer 1a present on the blanket 8 as necessary. The first paper layer 1a is then supplied to the second tank 7.

The second mesh cylinder 7a of the second tank 7 is equipped with a papermaking mesh having a mesh water impermeable area, so that a paper layer is not formed in the mesh water impermeable area, and a second paper layer 1b having a window (opening) is formed. Then, the second paper layer 1b with the window is transferred onto the first paper layer 1a on the blanket 8, and the second paper layer 1b is laminated on the first paper layer 1a. By adjusting the position of the window, for example, a window can be formed on the thread 9, and a combined paper in which the thread 9 is exposed from the outside through the window can be produced.

The shape of the window is not particularly limited, and can be a variety of shapes, such as a square, a rectangle, a string, a circle, etc. The window may also form an image, such as an animal pattern, in which case the window can be imaged.

The wet paper obtained by the wet papermaking process is dried in a drying process to become base paper. The drying process can be carried out by a standard drying method in the papermaking field, for example, by using a multi-cylinder dryer.

The base paper is cut in a cutting process. The cutting process can also be carried out by a cutting device that is commonly used in the papermaking industry.

In the manufacturing method of the present invention, by selecting the cutting portion of the base paper in the cutting step, unprinted base paper in the form of continuous paper or discontinuous paper can be selectively manufactured. For example, if the base paper is 1' as shown in Figure 3, cutting the base paper 1' in the left-right direction of Figure 3 at cutting line P, and then cutting it further in the up-down direction at the right end of Figure 3 so that six printing surfaces 2 are included in the left-right direction of Figure 3, will result in unprinted base paper in the form of discontinuous paper for printing paper as shown in Figure 1, while cutting at two cutting lines R will result in unprinted base paper in the form of continuous paper for printing paper as shown in Figure 2.

In the manufacturing method of the present invention, when selectively producing unprinted base paper in the form of continuous paper or discontinuous paper, it is the cut portion of the base paper in the cutting process that needs to be changed, and no change is required in the processes upstream of the cutting process. Therefore, in the manufacturing method of the present invention, unprinted base paper in the form of continuous paper or discontinuous paper can be selectively produced by simply selecting the cut portion of the base paper in the cutting process, without replacing the papermaking mesh used in the wet papermaking process.

The manufacturing method of the present invention preferably includes a pressing step of pressing the wet paper after the wet papermaking step and before the drying step. The smoothness of the base paper obtained by the pressing step can be improved.

[Papermaking mesh]
The present invention relates to
It has a margin along the periphery,
a plurality of spaced apart printed surfaces on a surface other than the margins;
The printing surfaces each include a cross-sectional shape varying region,
A papermaking net for wet-processing of unprinted base paper for printing paper in the form of continuous or discontinuous paper, the spacing between the printing surfaces being wider than the width of the margins,
A plurality of separated net cross-sectional shape change regions or net water permeability change regions are provided at positions on the surface of the net where the cross-sectional shape change regions can be formed,
It also relates to a papermaking system for wet-laid papermaking, which is capable of producing both unprinted base paper in continuous or discontinuous form.

The printed paper, unprinted paper, mesh cross-sectional shape variation area, and mesh water permeability variation area are as described above.

By using the papermaking net of the present invention, unprinted base paper having a predetermined cross-sectional shape variation region in the form of both continuous paper and discontinuous paper can be produced by wet papermaking. In other words, by using the papermaking net of the present invention, unprinted base paper having a predetermined cross-sectional shape variation region in the form of continuous paper or discontinuous paper can be selectively produced by wet papermaking without replacing the papermaking net.

Therefore, the papermaking net of the present invention is useful for the efficient production of unprinted base paper having a cross-sectional shape variation region.

And it has a margin along the periphery,
a plurality of spaced apart printed surfaces on a surface other than the margins;
The printing surfaces each include a cross-sectional shape varying region,
The interval between the printing surfaces is wider than the width of the margins.
The printed paper of the present invention can be produced by printing on unprinted base paper according to the above printing layout.

The present invention makes it possible to improve the manufacturing efficiency of unprinted base paper for printed matter having a cross-sectional shape variation region such as a watermark. In other words, the present invention makes it possible to manufacture unprinted base paper having a cross-sectional shape variation region such as a watermark in either continuous or discontinuous paper form using a single papermaking mesh, thereby improving manufacturing efficiency.

Conventionally, when switching the manufacturing form of unprinted paper for printed matter having a cross-sectional shape variation area such as a watermark from continuous paper to discontinuous paper, or from discontinuous paper to continuous paper, the manufacturing line had to be stopped temporarily to replace the papermaking mesh, so a certain amount or more of orders were required to manufacture continuous paper or discontinuous paper. However, with the present invention, if unprinted base paper before cutting is stored, both continuous paper and discontinuous paper can be produced by appropriately selecting the cutting mode of the unprinted base paper according to the order, so even small orders can be handled in detail.

1 Printing paper 2 Printing surface 3 Margin 4 Gap 5 Cross-sectional shape change area 6 First tank 7 Second tank 8 Blanket 9 Thread

Claims (15)

It has a margin along the periphery,
a plurality of spaced apart printed surfaces on a surface other than the margins;
The printing surfaces each include a cross-sectional shape varying region,
A printing paper in the form of continuous or discontinuous paper, in which the spacing between the printing surfaces is wider than the width of the margins. The printing paper according to claim 1, wherein the printing surface is rectangular. The printing paper according to claim 1 or 2, wherein the gap is at least twice the width of the margin. The printing paper according to any one of claims 1 to 3, wherein the light transmittance of the cross-sectional shape variation region is different from the light transmittance of the printing surface outside the cross-sectional shape variation region. The printing paper according to any one of claims 1 to 4, wherein the color of the cross-sectional shape variation region is different from the color of the printing surface outside the cross-sectional shape variation region. The printing paper according to any one of claims 1 to 5, wherein the cross-sectional shape variation region is a watermark or a window. The printing paper according to any one of claims 1 to 6, which has an embossed surface. The printing paper according to any one of claims 1 to 7, having threads. The printed paper according to any one of claims 1 to 8, which is anti-counterfeit paper. An unprinted base paper for the printed paper according to any one of claims 1 to 9. The unprinted base paper according to claim 10, which is a single-ply or multi-ply paper. The unprinted base paper according to claim 10, which is a laminated multi-layer paper. A method for producing an unprinted base paper according to any one of claims 10 to 12, comprising the steps of:
A wet papermaking process for obtaining a wet paper by wet papermaking using a papermaking net having a surface including a plurality of separated net cross-sectional shape change regions or net water permeability change regions capable of forming the cross-sectional shape change region;
A drying step of drying the wet paper to obtain a base paper;
The method includes at least a cutting step of cutting the base paper,
A method for producing unprinted base paper, comprising the steps of: selecting a cutting portion of the base paper in the cutting step; selectively producing unprinted base paper in the form of continuous paper or discontinuous paper without replacing the papermaking mesh. The manufacturing method according to claim 13, further comprising a pressing step of pressing the wet paper after the wet papermaking step and before the drying step. It has a margin along the periphery,
a plurality of spaced apart printed surfaces on a surface other than the margins;
The printing surfaces each include a cross-sectional shape varying region,
A papermaking net for wet-processing of unprinted base paper for printing paper in the form of continuous or discontinuous paper, the spacing between the printing surfaces being wider than the width of the margins,
A plurality of mesh cross-sectional shape change regions or mesh water permeability change regions are provided at positions on the surface of the papermaking mesh where the cross-sectional shape change regions can be formed,
A papermaking machine for wet papermaking, capable of producing both unprinted base paper in continuous or discontinuous form.

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