JPH11158797A - Print - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a print of a multicolor pattern with a gradation according to high-speed printing by forming a transparent coating layer containing sites where fluororesin particles present protruding from the surrounding sites thereof on a paper substrate. SOLUTION: This print is obtained by coating the top surface of a paper substrate containing cellulose fibers having >=3 mm average fiber length with a coating liquid containing fluororesin particles having >=1 and <=10 μm volume- average particle diameter and a binder such as a rosin-modified phenol resin according to an offset printing method or a gravure coating method, forming a transparent coating layer containing sites where the fluororesin particles are present protruding from the surrounding sites thereof, providing a coated paper having the formed transparent coating layer and providing a patternlike printing ink film arranged so as to compose a pattern of two or more colors with a gradation on the surface of the coated paper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated paper, and more particularly to a printed matter based on paper, which has been conventionally difficult to print, and has a multicolor pattern with gradation, and is easy and high-speed. And printed matter that can be mass-produced.

[0002]

2. Description of the Related Art Paper is a sheet obtained by entanglement of cellulose fibers taken from a plant as a raw material with each other, and hydrogen bonding hydrophilic groups such as OH groups contained in the cellulose fibers to each other. When this cellulose fiber is long, the entanglement between the fibers is strong, and the number of bonding points between the cellulose fibers is also large, and therefore, despite its thin thickness, it is tough and hard to break, and
It is known that flexible and highly transparent paper can be obtained. And supple and highly transparent paper like this
The entanglement of the fibers and the density of the fiber density can be observed with the naked eye, and the entanglement of the fibers and the density of the fiber density observed with the naked eye create a subtle texture and taste.

However, when printing on such a paper having a long fiber length, the adhesive strength of the printing ink to the printing plate or blanket exceeds the adhesive strength to the paper surface,
For this reason, the printing ink does not adhere to the paper surface, or the entanglement and hydrogen bond between the celluloses are broken, and the paper is peeled off or fluffed. In addition, since the adhesion of the printing ink is not stable, and it is not possible to accurately control where the ink adheres and where it does not adhere, it is difficult to print a pattern with gradation (dark and light), and it was possible to print a gradation image temporarily. However, only a low-quality printed matter having uneven gradation (shading) was obtained.

On the other hand, such a paper having a long fiber length has little or no rigidity required for printing due to its flexibility, and is easily wound around a printing cylinder or a blanket cylinder of a printing press. There was a problem. For this reason, for example, high-speed mass printing of several thousands to 10,000 sheets per hour has been impossible.

Further, such a paper having a long fiber length is easily absorbed by water, and when an offset printing is to be performed on the paper, dampening water adhered to the paper via a plate surface and a blanket surface of the offset printing machine. Absorbs water, swells and expands and contracts.
For this reason, before and after printing the first color, the size is different, and the size is not constant, so that it is difficult to align (register) the second color. For this reason, it was impossible to perform multicolor printing by offset printing on such a paper having a long fiber length.

[0006] On the other hand, a technique is also known in which a coating layer is applied to paper having a long fiber length, and printing is performed on the coating layer. For example, it is a coating liquid in which a natural resin such as alum or rosin is mixed with glue. There is also known a technique in which a synthetic resin such as polyamide, epoxy resin, polyethylene, or polyvinyl chloride is applied as a coating solution, and printing is performed on the obtained coating layer. However, the paper provided with these coating layers has a smooth surface. Therefore, when a large number of papers coated in this way are stacked, the paper and the paper come into close contact with each other. There is a problem that paper cannot be fed.

[0007] Due to the existence of these various problems, paper having a long fiber length has long been demanded despite its unique texture and taste, or excellent characteristics such as toughness and suppleness. However, a multicolor gradation image could not be printed.

[0008] Printing techniques currently applied to paper having a long fiber length include, for example, flexographic printing, silk screen printing, woodcut printing, and the like. Although not strictly included in the printing technology, as a means for applying a pattern, a printing die is placed on paper, and a dye solution or printing paste is applied from a hole formed in the printing die to obtain a cellulose fiber at an exposed portion. A dyeing method or a printing method for dyeing is applied. In addition, there is also known a method in which an anti-paste paste is applied in a pattern instead of a printing type, and cellulose fibers at a portion exposed from a portion where the anti-paste paste is not applied are dyed or printed. However, in any of these methods, it is difficult to form a pattern with gradation (dark and light) or a multi-color pattern, although the image forming speed is slow and time-consuming.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and is intended to provide a printed material using paper as a base material, which has been conventionally difficult to print, and a multi-colored printed material. It is an object of the present invention to provide a printed material having a color pattern and which can be easily, rapidly, and mass-produced.

[0010]

That is, according to the first aspect of the present invention, there is provided a paper base material, a transparent coating layer directly applied on the paper base material, and a printing layer provided on the transparent coating layer. Assuming printed matter with an ink film,
The transparent coating layer contains a fluororesin particle and a binder for fixing the fluororesin particle to the paper substrate, and the site where the fluororesin particle is present protrudes from a peripheral region thereof. It is.

According to the first aspect of the present invention, since a coating layer is applied directly on a paper base material, the adhesive force between the printing ink film and the coating layer is adjusted to transfer the printing ink. It is possible to increase performance. In addition, the coating layer provides a stiffness necessary for printing, and can prevent winding around a plate cylinder or a blanket cylinder of a printing press.

The coating layer according to claim 1 is
Since the resin paper contains the fluororesin particles and the site where the fluororesin particles protrude from the periphery thereof, the coated paper coated with the coating layer can be coated with the coated paper even when a large number of the coated papers are stacked. A gap is formed between the paper and the paper according to the size of the protruding portion, and these papers do not adhere to each other. For this reason, it is possible to apply the present invention to a high-speed printing machine, and moreover, to feed the sheets one by one without fail.

Further, since the fluororesin particles have water repellency and do not have water repellency in a portion where the fluororesin particles do not exist, the coated paper as a whole has appropriate water repellency and water absorption performance. It is possible.
For this reason, even when the coated paper is subjected to offset printing, the amount of dampening solution transferred from the blanket to the coated paper is controlled, and the water absorption of the paper base material is controlled, so that an appropriate amount of paper necessary for printing is obtained. It is possible to absorb water and to prevent excessive water absorption and expansion and contraction. Therefore, even when multi-color printing is performed by offset printing, the size of the paper does not change before and after printing the first color, and the second color or the third and fourth colors following the second color are surely positioned. Printing can be performed by registering (registering).

As described above, according to the first aspect of the present invention, the adhesive strength with the printing ink, the compatibility with the printing cylinder of the printing press, the compatibility with the paper feeding device of the printing press, and the offset printing press The compatibility with each part of the printing press, such as the compatibility with the fountain solution, is remarkably improved, so that it is suitable for a high-volume high-speed printing press as a whole, for example, for multi-color high-speed printing of 10,000 sheets or more per hour. It becomes possible.

Next, the fluororesin particles according to the first aspect are desirably those which are not dissolved in the solvent in the coating agent used for forming the coating layer and can be uniformly dispersed. Examples of such fluororesin particles include solvent-insoluble fluororesins, such as polytetrafluoroethylene resin, polychlorotrifluoroethylene resin, polyhexafluoropropylene resin, ethylene-fluoroethylene copolymer resin, and tetrafluoroethylene resin. Ethylene-hexafluoropropylene copolymer resin, polyperfluoroalkoxy resin and the like can be used. Preferably, it is a polytetrafluoroethylene resin.

Further, it is desirable that at least one of the fluororesin particles has a particle size larger than the thickness of the coating layer. Generally, the thickness of the coating layer is 1
５5 μm, and the maximum particle size in the fluororesin particles may reach several times the volume average particle size. Therefore, the volume average of the fluororesin particles in the coating liquid used for forming this coating layer is large. If the particle size is 1 μm or more, the largest of these fluororesin particles may be larger than the thickness of the coating layer. Preferably, the volume average particle size is at least 2 μm, more preferably at least 3 μm.
The volume average particle size can be measured, for example, by a laser diffraction method, a Coulter counter method, or the like. Since this measurement can be made by measuring the particle size of the fluororesin particles in the coating liquid, the production design of the coated paper can be simplified.

The invention according to claim 2 has been made based on such a reason. That is, the invention according to claim 2 comprises a paper substrate and a transparent coating directly applied on the paper substrate. Assuming that the printed matter includes a layer and a printing ink film provided on the transparent coating layer, the transparent coating layer is made of a fluororesin particle having a volume average particle diameter of 1 μm or more, and It is characterized by being provided by applying a coating liquid containing a binder fixed to a material.

Further, it is desirable that the fluororesin particles have a particle diameter capable of satisfactorily scattering light in the visible region. That is, the binder applied to the coating layer together with the fluororesin particles generally has low light absorption on the long wavelength side (about 700 nm) of light in the visible region (light having a wavelength of about 400 to 700 nm) and has a low light absorption rate on the short wavelength side (about 700 nm). About 400n
The light absorptance increases as approaching m). For this reason,
The binder is usually slightly colored to a complementary color (brown) of the color of light (purple) at 400 nm. Therefore, for example, when using paper having a delicate texture and taste due to the entanglement of fibers and the density of the fiber density, the paper may appear to be colored slightly brown due to the binder. . On the other hand, when the fluororesin particles scatter the visible light well, coloring can be suppressed by the scattered light. As described above, the coloring of the coating layer is suppressed, and furthermore, the gloss of the surface is suppressed by light scattering, so that the high whiteness and the associated texture and taste can be fully utilized. It is sufficient that the particle size is 10 μm or less. Further, it is preferably at most 8 μm, more preferably at most 5 μm. Incidentally, the average particle size in the coating layer can be measured by an electron microscope.

The invention according to claim 3 has been made based on such technical reasons. That is, the invention according to claim 3 is based on the invention according to claim 1 or 2,
The fluororesin particles have an average particle size of 10 μm or less.

The fluororesin particles preferably occupy 5 to 70% by weight of the coating layer. If the amount is less than 5% by weight, the water repellency of the coating layer is insufficient, and the coating layer easily expands and contracts due to water absorption. Preferably, 30% by weight
That is all. On the other hand, if it exceeds 70% by weight, the water absorption is insufficient, and stains during printing are likely to occur. Preferably,
It is 50% by weight or less.

Next, as the binder according to the present invention,
Synthetic resins or semi-synthetic resins that can be dissolved or dispersed in a solvent can be used. For example, rosin-modified phenolic resins, petroleum resins, alkyd resins or modified resins thereof, polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate- Copolymer, acrylic resin, polyester resin,
Examples include urethane resins, chlorinated polyolefin resins, chlorinated rubber resins, ethylene-vinyl acetate copolymer resins, polyamide resins, and cellulose resins.

Next, as the paper substrate according to claims 1 to 3, those containing cellulose fibers having an average fiber length of 3 mm or more can be suitably applied, but not limited thereto, and any paper can be applied. For example, paper which has conventionally been difficult to perform beautiful high-speed mass printing can be applied. For example, rough paper, straw paper, recycled paper, kraft paper, and the like.

As a paper base material containing cellulose fibers having an average fiber length of 3 mm or more, goat, manila hemp, crocodile, honey, etc. are used as raw materials, and the beating step is omitted or beaten under relatively mild conditions. Perform the process, to minimize the cutting of cellulose fibers contained in these raw materials,
Japanese paper whose average length is limited to 3 mm or more can be exemplified.

The invention according to claim 4 limits the paper base material to a preferable one for the above reasons. That is, a fourth aspect of the present invention is based on the first to third aspects, wherein the paper base material contains cellulose fibers having an average fiber length of 3 mm or more.

[0025] As the paper base material according to the fourth aspect, any of handmade Japanese paper and machine-made Japanese paper can be applied. Further, even in the case of Western paper, if the average fiber length is 3 mm or more, the pliability and toughness can be utilized, but Japanese paper is excellent in terms of texture and taste due to the degree of entanglement of cellulose fibers, and preferably It is possible to apply. For the same reason, it is preferable to use a material having high transparency and capable of visually observing the degree of entanglement of cellulose fibers when viewed through an electric or fluorescent lamp. In addition, the paper substrate may be any of a sheet paper and a rolled paper. In the case of web paper, high-speed printing is possible within the range of the performance of the printing press,
Thousands to 1000 per hour, even when using sheet paper
It is possible to perform multicolor gradation printing of four or more colors at zero or more high-speed printing.

Next, the coating liquid according to the present invention is applied to a paper substrate by using a printing method such as an offset printing method (offset printing with water and offset printing without water), a gravure printing method and a silk screen printing method. Can be applied.

When the coating is performed by using the offset printing method, it is preferable to use a rosin-modified phenol resin, a petroleum resin, an alkyd resin or a modified resin thereof as the binder. As the solvent, hydrocarbon solvents such as normal paraffin, isoparaffin, aromatic hydrocarbon, naphthene and α-olefin can be preferably used. In addition, drying oils such as linseed oil, tung oil and soybean oil can be added. In addition, additives such as a dryer, a drying inhibitor, and an ultraviolet absorber can be contained. The mixing ratio is, assuming that the binder is 100 parts by weight, 0 to 400 parts by weight of the drying oil, 0 to 100 parts by weight of the solvent, and 1 to 20 parts by weight of the additive. The fluororesin particles have a solid content (after coating and drying,
(Remaining as a coating layer, consisting of a binder, drying oil, additives, etc.)
It preferably occupies ~ 70 parts by weight. Preferably, 1
0 to 50 parts by weight.

The coating liquid can be applied directly onto a paper substrate by an offset printing method using a conventional method. “Direct” means that the composition is applied onto a paper substrate without a printing ink film. If the printing ink film is present, the paper substrate expands and contracts due to the fountain solution when the coating liquid is applied, and therefore, the printing ink film printed on the coating layer and the paper substrate and the coating layer The alignment with the printing ink film is
In effect, it becomes impossible.

Next, when applying by gravure printing, polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate-copolymer,
It is preferable to use acrylic resins, polyester resins, urethane resins, chlorinated polyolefin resins, chlorinated rubber resins, ethylene-vinyl acetate copolymer resins, polyamide resins, and cellulose resins. As the solvent, toluene, ethyl acetate, isobutyl acetate, methyl ethyl ketone, methyl isobutyl ketone and the like can be preferably used.
In addition, additives can be added. The mixing ratio was 100 parts by weight of the binder and 100 parts by weight of the solvent.
To 400 parts by weight and 0 to 20 parts by weight of additives. In addition,
Fluororesin particles, when the solid content is 100 parts by weight,
It is desirable to occupy 5 to 70 parts by weight. Preferably,
It is 10 to 40 parts by weight.

Claims 5 and 6 are based on the above circumstances, and specify a method of applying a coating layer. That is, the invention according to claim 5 is based on the invention according to claims 1 to 4, characterized in that the transparent coating layer is provided by offset printing, and according to claim 6, The invention is based on the premise of the invention according to claims 1 to 4, characterized in that the transparent coating layer is provided by gravure printing.

The transparent coating layer can be provided on one side of the paper substrate, but can also be provided on both sides. In this case, multi-color gradation printing can be performed on both surfaces.

The transparent coating layer is desirably formed uniformly on the entire surface of the paper substrate in order to minimize water absorption during the formation of the transparent coating layer and expansion and contraction caused by the water absorption. It is also possible to apply a pattern to a part of the substrate as long as the expansion and contraction of the substrate does not cause any harm. In this case, it is possible to provide a printing ink film on the transparent coating layer. However, even if the printing ink film is not provided, the light transmittance of the portion where the transparent coating layer is present is different from that of the portion where the transparent coating layer is not present. A decorative effect such as a pattern can also be exhibited.

It is also possible to form a thick transparent coating layer on a part of the paper base material and to form a relatively thin transparent coating layer on other parts. Again, in this case,
It exhibits a decorative effect similar to a watermark pattern.

Next, as the printing ink film according to the first to sixth aspects, a printing ink film constituting a pattern with gradation or a pattern provided so as to constitute a color pattern of two or more colors is provided. Printing ink film is applicable. For these reasons, the inventions according to claims 7 and 8 specify a printing ink film. That is, the invention according to claim 7 is based on the inventions according to claims 1 to 6, and is characterized in that the printing ink film forms a pattern with gradation. The invention according to item 8 is:
On the premise of the invention according to claims 1 to 7, the printing ink film comprises a patterned printing ink film arranged and provided so as to constitute two or more color pictures.

Incidentally, these printing ink films can be formed by conventionally known offset printing (offset printing with water and offset printing without water), gravure printing, etc., and in particular, several thousand to ten thousand per hour. High-speed mass printing of 1,000 sheets is possible. Also, printing can be performed by an electrophotographic printing method represented by color copying. When applied to an electrophotographic printing method such as a color copy, it is possible to easily and easily form a small number of various kinds of printed patterns on a paper base material such as Japanese paper which is excellent in texture and taste. . When the printing of the pattern and the application of the transparent coating layer are performed by the same printing method, the printing of the pattern can be performed by one printing machine following the application of the transparent coating layer.

It is also possible to further apply the above-mentioned transparent coating layer on the printing ink film, and to sandwich the printing ink film between the transparent coating layers. In this case,
Since the upper surface of the printing ink film is covered with the transparent coating layer having high water repellency, the resistance to lipophilic solvents and the like in addition to hydrophilic beverages, sweat, etc. is improved, and printed matter having extremely high preservability can be obtained.

Next, the printed matter according to the present invention can be applied to any use. However, when the paper base is made of paper having a long average fiber length, its transparency, flexibility, texture, taste, etc. It is desirable to apply to applications that can make use of the characteristics.

Such applications include, for example, folding screens,
Examples include bran front paper, wallpaper front paper, and shoji paper. When applied to these uses, it is desirable to exhibit a decorative effect similar to a watermark pattern.
Such a decorative effect can be achieved, for example, by providing a transparent coating layer in a pattern or by partially changing the thickness of the transparent coating layer. Alternatively, the printing ink film may be formed by printing a thin black ink in a pattern.

When used as a reproduction of a scroll such as a Japanese painting, a print, a scroll, a religious picture, a mandala picture, a scripture, or a scroll picture, it has a taste that is hard to distinguish from the real picture.

Also, it should be used for catalogs of presents, gifts for congratulations or uncongratulations, invitations and invitations for weddings, greeting cards, Christmas cards, telegrams, etc. Is also possible.

Further, when applied to a lamp shade or a running light used for indoor lighting, it is possible to create a fascinating atmosphere having a multicolor gradation pattern. Moreover, it is also possible to enhance the hygiene and aesthetic properties as indoor ceiling paper, wallpaper and the like.

Further, the present invention can be used for a cover of a magazine or a book or a sheet of a body, a calendar, a poster, a flyer, a catalog, a book cover, and the like.

Further, the present invention can be applied to chiyogami, origami, and the like, and chiyogami or origami having a photographic pattern which has not existed conventionally can be obtained.

In addition, liquid containers such as sake (glass bottles,
It can also be used as a label for plastic bottles). Since the transparent coating layer according to the present invention has water repellency, it is difficult for microorganisms and fungi mixed in water to adhere thereto, and since an aqueous component serving as a nutrient is hard to adhere, it is possible to suppress the growth of microorganisms and fungi. Can be. And, for this reason, it becomes possible to apply as a label of a beverage container and to improve its hygiene. In addition, it can also be used as paper for the exterior of a liquid paper container such as a paper pack. In this case, by laminating a plastic film, aluminum foil, or a plastic film having a silicon oxide vapor-deposited film and the like, by making the laminated material such that the paper substrate can be visually observed from the outer surface, Both hygiene and aesthetic properties can be enhanced.

In addition, various types of wrapping paper, such as mizuhiki paper, paper doll paper, exterior and interior of packaging boxes, individual wrapping paper such as buns, wrapping paper for wrapping products sold in stores such as department stores, and kimonos It can be used as a wrapping paper for wrapping or preserving garments or for storing. Further, the printed matter of the present invention can be sewn and used as clothing such as shirts, blouses, suits and the like.

[0046]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] Preparation of Varnish A rosin-modified phenol resin is used as a binder,
First, varnish A was prepared to have the following composition.
That is, 40% by weight of the rosin-modified phenol resin,
Tung oil 40% by weight, No. 3 solvent (Nippon Petrochemical Co., Ltd.)
Solvent production) 20% by weight was charged into a four flask with a stirring function, and heated to 180 ° C. to dissolve the binder,
Varnish A was used.

Preparation of Transparent Coating Solution To this varnish A, polytetrafluoroethylene particles (volume average particle size of 3.9 μm measured by a laser diffraction method) were mixed at a ratio of 88.4 parts by weight of varnish A to 10 parts by weight of particles. After thoroughly dispersing and kneading with a ball mill, 0.3% by weight of manganese naphthenate, 0.3% by weight of a cobalt naphthenate dryer and 1% by weight of a drying inhibitor were mixed as additives to form a transparent coating liquid. . When the solid content (the component remaining on the paper substrate after printing and drying) in the coating liquid is 100 parts by weight, the content of the polytetrafluoroethylene particles is about 12.1 parts by weight.

Echizen Japanese paper (average fiber length: 4 mm, medium-thick mouth, sheet paper) manufactured by hand-making from groats as a base material for forming a transparent coating layer
It was used. This paper base material had a delicate texture, with the entanglement of the cellulose fibers being visually recognizable, and had high transparency and whiteness. When the electric lamp was seen through the electric lamp, the electric lamp felt dazzling.

A large number of the paper substrates are stacked and stacked, and the stacked body is mounted on a sheet feeding section of a sheet-fed offset printing press, and the transparent coating liquid is used as an offset ink.
A transparent coating layer was formed by uniformly applying and drying the entire surface of both sides of the Japanese paper.

An electron micrograph of the cross section of the obtained coating layer was taken and analyzed by a computer. As a result, the coating layer had an average thickness of about 1.1 μm, and the polytetrafluoroethylene particles contained 3 μm. 0.9 or less. In addition, the polytetrafluoroethylene particles are crushed by the meat of a printing machine or the like,
Despite the reduction in particle size, the protrusion protruded from the coating layer to form a protrusion.

In addition, despite the fact that the paper substrate absorbed the dampening solution of offset printing, no expansion or contraction of the paper was recognized by the naked eye, and all of its transparency, whiteness and texture were transparent. It felt the same as before the coating layer was formed.

A large number of the above-mentioned paper base materials provided with a transparent coating layer on both sides of the pattern printing are stacked and accumulated.
(High-speed offset printing press with eight colors (Headerberg Co., 4 colors + 4 backs) manufactured by Heidelberg) was attached to the paper feed unit. A face photograph of an entertainer was adopted as the front side pattern, and a multicolored pattern with gradation in four colors of ink, indigo, red, and yellow was printed. In addition, a Japanese map was adopted as the back side pattern, and a multicolored pattern without gradation was printed in four colors of black, indigo, red, and yellow. The map symbols and characters on the back side of the Japan map were printed with black ink.

Then, the high-speed offset printing press was operated. At the beginning of the operation, printing was performed at a speed of 3,000 sheets per hour, but the speed was gradually increased, and printing was performed at a maximum speed of 8,000 sheets per hour. Even at this maximum speed, printing could be performed to the end of the stack without any trouble such as a paper feeding error or a paper wrapping around the blanket cylinder.

The obtained printed matter was sampled during printing, and its hue, gradation and register of each color were confirmed. Not only those printed at a printing speed of 3000 sheets per hour, but also 80
The one printed at the maximum speed of 00 sheets also has the desired hue and gradation, the register accuracy of each color is high, and it has been confirmed that full-color high-speed mass offset printing can be put to practical use.

[Second to sixth embodiments] The mixing ratio of varnish A and polytetrafluoroethylene particles was 85.4 parts by weight of varnish A, 13 parts by weight of particles (second embodiment), and varnish, respectively. A81.4 parts by weight: 17 parts by weight of particles (third embodiment), varnish A78.4 parts by weight: 20 parts by weight of particles (fourth embodiment), varnish A68.4
Parts by weight: 30 parts by weight of particles (fifth embodiment), 60.4 parts by weight of varnish: 38 parts by weight of particles (sixth embodiment)
Other than the above, high-speed printing was performed in the same manner as in the first embodiment.

When the solid content is 100 parts by weight, the content of the polytetrafluoroethylene particles is as follows:
15.7 parts by weight, 20.3 parts by weight, 23.8 parts by weight, 3
0.8 parts by weight and 43.2 parts by weight.

Each of the obtained prints has the desired hue and gradation, the register accuracy of each color is high, and the content of polytetrafluoroethylene is 10 to 5 in solid content ratio.
Even at 0% by weight, it was confirmed that full-color high-speed mass offset printing was possible.

Seventh Embodiment Preparation of Varnish Acrylic polyol having methyl methacrylate and butyl methacrylate as main constituent units, and vinyl chloride
Using a vinyl acetate copolymer resin as a binder, a varnish B was first prepared to have the following composition.

That is, the acrylic polyol 2
2.5% by weight, 2.5% by weight of the vinyl chloride-vinyl acetate copolymer resin, 37.5% by weight of toluene, 17.5% by weight of isobutyl acetate, 15% by weight of ethyl acetate, and 3% by weight of methyl isobutyl ketone were stirred. The mixture was charged into a four-necked flask equipped with a function and heated to dissolve the binder, thereby obtaining Varnish B.

Preparation of Transparent Coating Solution 100 parts by weight of this varnish B were mixed with polytetrafluoroethylene particles (a volume average particle size of 3.9 measured by a laser diffraction method).
μm) was mixed at a ratio of 5 parts by weight and sufficiently dispersed to obtain a transparent coating liquid. When the solid content (the component remaining on the paper substrate after printing and drying) in this coating liquid is 100 parts by weight, the content of the polytetrafluoroethylene particles is about 16.7 parts by weight.

Echizen Japanese paper (average fiber length: 4 mm, medium-thick mouth, sheet paper) manufactured by hand-making from groats as a base material for forming a transparent coating layer
It was used. This paper base material had a delicate texture, with the entanglement of the cellulose fibers being visually recognizable, and had high transparency and whiteness. When the electric lamp was seen through the electric lamp, the electric lamp felt dazzling.

The transparent coating solution was uniformly applied on the entire surface of one side of the paper substrate by a small gravure proof press and dried. Next, the paper substrate was inverted, and uniformly coated and dried on the opposite surface.

An electron micrograph of a cross section of the obtained coating layer was taken and analyzed by a computer. As a result, the coating layer had an average thickness of about 3 μm, and the polytetrafluoroethylene particles contained 3.9 μm. It had the following average particle size. In addition, the polytetrafluoroethylene particles are destroyed by the meat of the printing machine or the like,
In spite of the decrease in the particle size, a part thereof protruded from the coating layer to constitute a convex portion.

The transparency, whiteness, and texture of the paper substrate were all the same as before the formation of the transparent coating layer.

A large number of the above-mentioned paper substrates provided with a transparent coating layer on both sides of the pattern printing were stacked and stacked, and the stack was mounted on a sheet feeding section of a sheet-fed gravure printing machine. In addition, the landscape of the beach with clouds and blue sky was adopted as the pattern on the front side, and a multi-color pattern with gradation in four colors of ink, indigo, red, and yellow was printed. As the picture on the back side, the guide map of the above-mentioned beach was printed with a multi-color picture with no gradation in four colors of ink, indigo, red, and yellow. The characters in the guide map on the back side were printed with black ink.

Then, the sheet-fed gravure printing machine was operated. At the beginning of operation, printing was performed at a relatively low speed, but the printing speed was gradually increased and printing was performed at a high speed. Even at this maximum speed, printing could be performed up to the end of the stack without causing troubles such as a paper feeding error or winding of the paper around the gravure plate cylinder.

The printed matter obtained was sampled during printing, and its hue, gradation and register of each color were confirmed. Not only those printed at low speed but also those printed at the highest speed have the expected hue and gradation, and the registration accuracy of each color is high, so it can be confirmed that full-color high-speed mass printing can be commercialized. Was.

[Eighth and Ninth Embodiments] Varnish B100
To the parts by weight, polytetrafluoroethylene particles,
High-speed printing was performed in the same manner as in the seventh embodiment, except that each was 8 parts by weight (the eighth embodiment) and 10 parts by weight (the ninth embodiment).

When the solid content is 100 parts by weight, the content of the polytetrafluoroethylene particles is as follows:
34.9 parts by weight and 28.6 parts by weight.

Each of the obtained prints has the desired hue and gradation, the register accuracy of each color is high, and the content of polytetrafluoroethylene is 10 to 4 in terms of solid content.
Even at 0% by weight, it was confirmed that full-color high-speed mass gravure printing was possible.

[0071]

According to the invention according to claims 1, 5 to 8,
The transparent coating layer applied directly on the paper base contains fluororesin particles and a binder for fixing the fluororesin particles to the paper base, and the site where the fluororesin particles are present protrudes from the surrounding area. Each part of the printing press, such as adhesion to printing ink, compatibility with the printing cylinder of the printing press, compatibility with the paper feeder of the printing press, and compatibility with the dampening solution of the offset printing press. Compatibility is significantly improved.
Therefore, even if paper, which has conventionally been difficult to print, is used as a base material, it is possible to achieve multicolor high-speed printing, which is compatible with a mass high-speed printing machine as a whole.

According to the present invention, the transparent coating layer is provided by applying a coating liquid containing fluororesin particles having a volume average particle diameter of 1 μm or more. Since the particle size can be measured by measuring the particle size of the pigment in the coating liquid, the production design of the coated paper and the printed matter obtained therefrom can be simplified.

Next, according to the third, fifth to eighth aspects of the present invention, the fluororesin particles have an average particle size of 10 μm or less, and scatter the visible light well. The effect that the accompanying texture and taste can be fully utilized can be obtained. According to the inventions according to Claims 4 and 5, since the paper base contains cellulose fibers having an average fiber length of 3 mm or more, high flexibility and high color printing can be performed by utilizing its flexibility and toughness. This has the effect of becoming

Claims (8)

[Claims] 1. A printed matter comprising a paper substrate, a transparent coating layer applied directly on the paper substrate, and a printing ink film provided on the transparent coating layer, wherein the transparent coating layer comprises: A printed material comprising: fluororesin particles; and a binder for fixing the fluororesin particles to the paper base, wherein a site where the fluororesin particles are present protrudes from a peripheral portion thereof. 2. A printed matter comprising a paper substrate, a transparent coating layer applied directly on the paper substrate, and a printing ink film provided on the transparent coating layer, wherein the transparent coating layer comprises: A printed matter provided by applying a coating liquid containing fluororesin particles having a volume average particle diameter of 1 μm or more and a binder for fixing the fluororesin particles to the paper substrate. 3. An average particle size of the fluororesin particles is 10 μm.
The printed matter according to claim 1, wherein: 4. The printed matter according to claim 1, wherein the paper substrate contains cellulose fibers having an average fiber length of 3 mm or more. 5. The printed matter according to claim 1, wherein said transparent coating layer is provided by offset printing. 6. The printed matter according to claim 1, wherein said transparent coating layer is provided by gravure printing. 7. The printed matter according to claim 1, wherein the printing ink film forms a pattern with gradation. 8. The printing ink film according to claim 1, wherein said printing ink film comprises a patterned printing ink film provided so as to constitute two or more color pictures. Printed matter.