Printed paper, unprinted base paper, method for producing unprinted base paper, and papermaking net

Abstract

To improve the productivity of paper for printed matter having a watermark, etc.SOLUTION: Printing paper in continuous paper or noncontinuous paper form has a blank space along its circumference and also has a plurality of separated printing faces on the surface other than the blank space, wherein the printing faces include a cross-sectional shape fluctuation area respectively, and a space between the printing faces is wider than a width of the blank space.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to improving the efficiency of manufacturing paper for printed matter having watermarks or the like. [Background technology]

[0002] Watermarks are known as a counterfeit prevention technique for printed matter such as gift certificates. A watermark is a pattern that appears when the paper on which it is applied is viewed through, and there are two types of watermark: a "white watermark" where the pattern is visible through the paper, and a "black watermark" where the pattern appears darker than the surrounding area.

[0003] These watermark patterns are usually formed by partially changing the basis weight of constituent fibers such as pulp fibers in 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 pattern 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 parts 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.

[0004] Also, as a type of watermark, there is known a type 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 to increase light transmittance, for example, ink made by dissolving a transparent synthetic resin in a solvent, and the printed part where the ink is applied becomes a watermark, and has the same visual effect as a white watermark.

[0005] 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 portion. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Utility Model Registration No. 3028886 Summary of the Invention [Problem to be solved by the invention]

[0007] 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 sheets 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 sheets 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-lot production.

[0008] Conventionally, for paper having watermarks or the like, 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.

[0009] In addition, when replacing the papermaking screen, the paper production line must be stopped temporarily, and time is required to adjust the papermaking conditions, which causes a decrease in yield. In addition, depending on the situation of the adjustment of the papermaking conditions, the yield may be significantly decreased. Furthermore, a different papermaking screen must be prepared, which increases the time and cost required for preparing the papermaking screen.

[0010] An object of the present invention is to solve the above problems, specifically, to improve the manufacturing efficiency of paper for printing with watermarks or the like. [Means for solving the problem]

[0011] Therefore, as a result of extensive research, the inventors discovered that by devising the printing layout of the printed matter, it is possible to produce both continuous paper and discontinuous paper using a single papermaking machine, and thus completed the present invention.

[0012] The first aspect 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 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.

[0013] It is preferable that the printing surface is rectangular.

[0014] It is preferable that the gap is at least twice the width of the margin.

[0015] The cross-sectional shape variation region may have a light transmittance different from the light transmittance of the printed surface outside the cross-sectional shape variation region.

[0016] 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.

[0017] The cross-sectional shape variation region is preferably a watermark or a window.

[0018] The printing paper of the present invention may have embossment.

[0019] The printing paper of the present invention may have threads.

[0020] The printed paper of the present invention is preferably anti-counterfeit paper.

[0021] A 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.

[0022] The unprinted base paper may be either a single-ply paper or a multi-ply paper.

[0023] The unprinted base paper may be a laminated multi-layer paper.

[0024] 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; A cutting step of cutting the base paper At least one of the following is provided: 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 screen.

[0025] The manufacturing method preferably includes a pressing step of pressing the wet paper after the wet papermaking step and before the drying step.

[0026] A fourth aspect 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, A papermaking net for wet-laid papermaking 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. Effect of the Invention

[0027] In the present invention, by devising a printing layout for a printed matter having a cross-sectional shape variation region such as a watermark, it is possible to produce both continuous paper and discontinuous paper using a single papermaking machine.

[0028] In other words, the printed paper of the present invention having a cross-sectional shape variation region such as a watermark has a predetermined printing layout, and therefore, unprinted base paper before printing can be produced using a single papermaking network, regardless of whether the base paper is in the form of continuous paper or discontinuous paper.

[0029] Therefore, in the present invention, when switching the form of the unprinted base paper to be produced from continuous paper to discontinuous paper or from discontinuous paper to continuous paper, there is no need to replace the papermaking mesh.

[0030] Therefore, when switching the form of the paper to be manufactured between continuous paper and discontinuous paper, there is no need to stop the manufacturing line to replace the papermaking net, and there is no need to adjust the papermaking conditions again. Furthermore, since manufacturing 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 a papermaking net is unnecessary.

[0031] In this way, the present invention can improve the efficiency of manufacturing paper for printed matter having watermarks or the like. [Brief description of the drawings]

[0032] [Figure 1] FIG. 2 is a diagram showing one embodiment of a print layout of a printing paper of the present invention. [Diagram 2] 11A to 11C are diagrams showing other aspects of the print layout of the printing paper of the present invention. [Diagram 3] 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. [Figure 4] 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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] The present invention is characterized by devising the print 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 a cross-sectional shape variation region such as a watermark. 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.

[0034] The printed paper, the unprinted base paper, the method for producing the unprinted base paper, and the papermaking net, which are aspects of the present invention, will be described below.

[0035] [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.

[0036] In the present invention, "printed paper" means paper on which printing has been applied.

[0037] FIG. 1 is a diagram showing one embodiment of a printing layout of the printing paper of the present invention.

[0038] Specifically, Fig. 1 is a top view showing the printing layout of printed paper 1 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.

[0039] The printed paper 1 has multiple printing surfaces 2 and margins 3. The margins 3 exist along the periphery of the printed paper 1, and the printed surfaces 2 exist on the surface of the printed paper 1 other than the margins 3. In the example of Figure 1, the margins 3 exist along the entire periphery of the printed paper 1, and have a predetermined width m in the width direction of the printed paper 1 (the left-right direction in Figure 1).

[0040] In the example of Figure 1, there are three printing surfaces 2 in the width direction of the printed paper 1 (left and right direction in Figure 1), and six printing surfaces 2 along the length direction of the printed paper 1 (top and bottom 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.

[0041] In the present invention, the gap between the printed surfaces is wider than the width of the margin. Therefore, in the example of Fig. 1, the width S of the gap 4 is wider than the width m of the margin 3. In the present invention, it is preferable that the gap between the printed surfaces is at least twice the width of the margin. In the example of Fig. 1, the width S is twice the width m.

[0042] 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 part of the cross-sectional shape variation region 5 is included in the printed surface 2, and it is not necessary that the entire cross-sectional shape variation region 5 is included in the printed surface 2, but the entire 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.

[0043] 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.

[0044] In the example of Fig. 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 and at a distance from each other. In the example of Fig. 1, three rows of multiple cross-sectional shape variation regions 5 are arranged in parallel. Each printed surface 2 includes a cross-sectional shape variation region 5. It is sufficient that each printed surface 2 includes 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 Fig. 1.

[0045] 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, which does not cause the cross-sectional shape of the printed paper 1 to vary, does not correspond to the cross-sectional shape variation region 5.

[0046] When the printed paper 1 is made of two or more paper layers, the cross-sectional shape variation region 5 may be a window (opening). That is, by laminating 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.

[0047] Furthermore, 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 view.

[0048] 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.

[0049] The colorant used for coloring is not particularly limited, but is preferably a dye and / or a pigment. The dye may be a fluorescent dye, and the pigment may be a fluorescent pigment.

[0050] 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.

[0051] Examples of the thread include films printed with holograms, microcharacters, and multi-layer interference films that are widely used for anti-counterfeiting purposes.

[0052] As the film for the thread, any film commonly used for preventing counterfeiting, such as a metallic gloss film, a colored film, a magnetic film, a fluorescent film, etc. 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 the wet papermaking.

[0053] The shape of the thread is not particularly limited, but when the thread is approximately rectangular, the thread width can be, for example, 0.3 to 10 mm, and the thread thickness can be, for example, 12 μm to 50 μm.

[0054] The embossment can be formed, for example, by pressing a mold having concave and / or convex shapes or an object equivalent thereto into the paper.

[0055] The location of the embossments and / or threads on the printed paper 1 is not particularly limited, but it is preferable that they are present in the cross-sectional shape varying region 5 .

[0056] 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 the cross-sectional shape variation region 5 is a watermark or a window, the printed paper of the present invention is particularly suitable as anti-counterfeit paper.

[0057] FIG. 2 is a diagram showing another embodiment of the print layout of the printing paper of the present invention.

[0058] Specifically, Fig. 2 is a top view showing the printing layout of printed paper 1 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. The printing method is not particularly limited. The printed paper 1 in Fig. 2 can be shipped in the form of a roll.

[0059] 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.

[0060] 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 apart 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.

[0061] In other respects, the printed paper 1 in Fig. 2 is the same as the printed paper 1 in Fig. 1. For example, in the example of Fig. 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 Fig. 2, the width S is twice the width m.

[0062] The printed paper in the discontinuous paper form of FIG. 1 and the printed paper in the continuous paper form of FIG. 2 can be obtained by printing an unprinted base paper in the discontinuous paper form and an unprinted base paper in the continuous paper form, respectively.

[0063] In the present invention, the term "unprinted base paper" refers to paper before printing is performed.

[0064] [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.

[0065] Figure 3 shows an example of base paper 1' that 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.

[0066] Although the base paper 1' in FIG. 3 is not actually printed, for the sake of convenience in explaining the correspondence with the printed paper 1 in FIGS. 1 and 2, the printing layout of the printing to be applied to the printed paper 1 in FIGS. 1 and 2 is shown superimposed.

[0067] P and R in FIG. 3 are cutting lines corresponding to a straight line extending along the center of the interval 4.

[0068] In the base paper 1' in Fig. 3, there are six printing surfaces 2 in the width direction (the vertical direction in Fig. 3). Therefore, if the base paper 1' is cut along cutting line P and then further cut in the vertical direction at the right end of Fig. 3 so that six printing surfaces 2 are included in the horizontal direction in Fig. 3, it will become the unprinted base paper for the printed paper in Fig. 1, while if it is cut along the two cutting lines R, it will become the unprinted base paper for the printed paper in Fig. 2.

[0069] In the example of Figure 3, the cutting lines P and R correspond to a straight line extending along the center of the gap 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 gap 4 becomes the new margin 3. On the other hand, if the gap 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 positions of the cutting lines 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.

[0070] The base paper 1' contains a paper stock. Usually, 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 may be used alone or in combination of two or more.

[0071] The paper stock may contain other components in addition to cellulose fibers, such as synthetic fibers made of resins such as polyethylene, polypropylene, and polyethylene terephthalate; paper strength agents or fixing agents such as starch, polyacrylamide, and polyamine polyamide epichlorohydrin; sizing agents, fillers, drainage retention agents, water-resistant agents, fixing agents, defoamers, and slime control agents, and these may be used alone or in combination of two or more.

[0072] 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.

[0073] 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, and organic pigments such as plastic pigments, and these can be used alone or in combination of two or more. The 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 preferably used 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 appropriately used in the range of preferably 10 to 100% by mass in terms of solid content relative to the total mass of the coating layer.

[0074] The adhesive for the coating layer may be any water-dispersible or water-soluble adhesive that is usually contained in the coating layer, without any particular limitation, and may be used alone or in combination of two or more of these. Examples of the water-dispersible adhesive 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 a functional group-containing monomer such as a carboxyl group. Examples of the water-soluble adhesive include starches such as polyvinyl alcohol, oxidized starch, cationic starch, esterified starch, and dextrin. The content of the adhesive in the coating layer is not particularly limited, but it can be suitably used in the range of preferably 5 to 50 parts by mass in terms of solid content per 100 parts by mass of all the fillers in the coating layer.

[0075] The coating layer may 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 that the coating layer contains a surfactant. In particular, when coating a paper layer having irregularities, the leveling ability of the coating liquid is further improved, and contour coating that follows the irregularities of the paper layer can be achieved. Therefore, by containing a surfactant in the coating layer, it is possible to further improve the printing uniformity of the printed paper.

[0076] The base paper 1' may be a laminated multi-layer paper. A laminated multi-layer paper has multiple paper layers and can be produced by laminating multiple paper layers together. One of the paper layers may have a window (opening). The method of laminating is not particularly limited, but for example, a multi-chamber cylinder papermaking machine can be used.

[0077] In addition, when a thread is to be present in the window, 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 thread can be inserted between the paper layers just before overlapping this with the inner paper layer (or the outermost paper layer) which does not have a window opening, so that the thread is exposed from the window opening.

[0078] [Manufacturing method of unprinted base paper] The unprinted base paper of the present invention can be produced by wet papermaking.

[0079] 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; A cutting step of cutting the base paper At least one of the following is provided: 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.

[0080] The wet papermaking process corresponds to the wet paper forming stage (wire part) in normal wet papermaking.

[0081] 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 a cross-sectional shape variation region in the printed paper or unprinted base paper of the present invention.

[0082] The mesh cross-sectional shape variation region is a region where the cross-sectional shape of the papermaking net varies compared to other regions, and in the region where the cross-sectional shape varies from the inside to the outside of the papermaking net, less stock accumulates on the papermaking net surface compared to other regions, forming a white watermark. On the other hand, in the region where the cross-sectional shape varies from the outside to the inside of the papermaking net, more stock accumulates on the papermaking net surface compared to other regions, forming a black watermark.

[0083] The mesh water permeability varying 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 predetermined portion of the papermaking mesh to block the mesh. Since paper stock does not accumulate in the water impermeable region, a window (opening) can be formed in the region. A water impermeable resin plate of a predetermined shape can be attached to a predetermined portion of the papermaking mesh.

[0084] FIG. 4 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.

[0085] The wet papermaking process shown in Fig. 4 uses a two-chamber cylinder papermaking machine. The two-chamber cylinder papermaking machine in Fig. 4 consists of a first chamber 6 having a first cylinder 6a equipped with a normal papermaking mesh, and a second chamber 7 having a second cylinder 7a equipped with a papermaking mesh having a mesh water-impermeable region.

[0086] In the wet papermaking process shown in Fig. 4, a normal first paper layer 1a is formed in a first tank 6 and transferred onto a blanket 8. Next, threads 9 are provided on the surface of the first paper layer 1a on the blanket 8 as necessary. Then, the first paper layer 1a is supplied to a second tank 7.

[0087] Since the second mesh cylinder 7a of the second tank 7 is equipped with a papermaking mesh having a mesh water-impermeable region, a paper layer is not formed in the mesh water-impermeable region, 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.

[0088] The shape of the window is not particularly limited, and may be various shapes such as a square shape, a rectangle shape, a string shape, a circle shape, etc. Furthermore, the window may form an image such as an animal pattern, in which case the window can be imaged.

[0089] The wet paper obtained by the wet papermaking process is dried to form base paper in a drying process. The drying process can be carried out by a common drying method in the papermaking field, for example, by using a multi-cylinder dryer.

[0090] The base paper is cut in a cutting step, which can also be performed by a cutting device commonly used in the papermaking field.

[0091] 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 Fig. 3, cutting the base paper 1' in the left-right direction in Fig. 3 at cutting line P and further cutting in the up-down direction at the right end of Fig. 3 so that six printing surfaces 2 are included in the left-right direction in Fig. 3 will result in unprinted base paper in the form of discontinuous paper for printing paper as shown in Fig. 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 Fig. 2.

[0092] In the manufacturing method of the present invention, when selectively manufacturing unprinted base paper in the form of continuous paper or discontinuous paper, it is only the cut portion of the base paper in the cutting step that needs to be changed, and no change is required in the steps upstream of the cutting step. Therefore, in the manufacturing method of the present invention, it is possible to selectively manufacture unprinted base paper in the form of continuous paper or discontinuous paper by simply selecting the cut portion of the base paper in the cutting step, without replacing the papermaking mesh used in the wet papermaking step.

[0093] 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, which can improve the smoothness of the base paper obtained by the pressing step.

[0094] [Papermaking network] 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-laid papermaking 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.

[0095] The printed paper, the unprinted paper, the mesh cross-sectional shape variation region, and the mesh water permeability variation region are as described above.

[0096] By using the papermaking net of the present invention, unprinted base paper having a predetermined cross-sectional shape variation region in both the form of continuous paper and discontinuous paper can be produced by wet papermaking. That is, 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.

[0097] 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.

[0098] 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. [Industrial Applicability]

[0099] 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. That is, the present invention makes it possible to manufacture unprinted base paper having a cross-sectional shape variation region such as a watermark in either the form of continuous paper or discontinuous paper using one papermaking mesh, thereby making it possible to improve manufacturing efficiency.

[0100] In the past, when switching the production form of unprinted paper for printed materials having areas of cross-sectional shape variation such as watermarks from continuous paper to discontinuous paper, or from discontinuous paper to continuous paper, the production line had to be stopped temporarily to replace the papermaking mesh, so orders of a certain quantity or more were required to produce continuous paper or discontinuous paper.However, with the present invention, if the unprinted base paper before cutting is stored, both continuous paper and discontinuous paper can be produced by appropriately selecting the cutting method of the unprinted base paper according to the order, so even small orders can be handled in a detailed manner. [Explanation of symbols]

[0101] 1 printing paper 2 Printing side 3. Margins 4 intervals 5 Cross-sectional shape variation area 6 Tank 1 7 Tank 2 8. Blankets 9 Threads

Claims

1. 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.

2. 2. The printing paper of claim 1, wherein said printing surface is rectangular.

3. 3. The printing paper according to claim 1, wherein the gap is at least twice the width of the margin.

4. The printing paper according to claim 1 , 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.

5. 5. The printing paper according to claim 1, 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.

6. 6. The printing paper according to claim 1, wherein the cross-sectional shape variation region is a watermark or a window.

7. 7. The printing paper according to claim 1, which has embossment.

8. 8. Printing paper according to any one of the preceding claims, comprising threads.

9. 9. The printed paper according to claim 1, which is an anti-counterfeit paper.

10. 10. An unprinted base paper for the printed paper according to any one of claims 1 to 9.

11. 11. The unprinted base paper of claim 10 which is a single-ply or multi-ply paper.

12. The unprinted base paper according to claim 10, which is a laminated multi-layer paper.

13. 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; A cutting step of cutting the base paper At least one of the following is provided: 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.

14. 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.

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 papermaking net for wet-laid papermaking 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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