JPH07279096A - High gloss printed material - Google Patents

Abstract

PURPOSE:To obtain a high gloss printed material excellent in high gloss, abrasion, water and flexural breakage resistances and capable of being recovered as a pulp raw material in the case it is wasted or spent by forming a pigment coating layer, by using a gate roll coater according to the on machine coating method. CONSTITUTION:This high gloss printed material is obtained by forming a coating layer composed of a pigment containing kaolin as the main component and an adhesive containing polyvinyl alcohol having 270 to 800 degree of polymerization, phosphated starch and/or acetylated starch and having 10 to 20g/m<2> weight on oven-dry base on a base paper composed mainly of wood pulp by using a gate roll coater according to the on-machine coating method, applying a printing treatment to the surface of the coating layer to form a printed surface and further forming an overprinting varnish coating layer on the printed surface. The high gloss printed material is useful for commercial art printing, a publication printing material, a printed wrapping material and a printed paper container.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to high-gloss printed matter. More specifically, the present invention is mainly applied to commercial art prints, publication prints, packaging material prints, and paper container prints, and the gloss and shine (gloss) of the printing surface are highly developed, and the abrasion resistance and water resistance are high. The present invention also relates to a high-gloss printed matter which is resistant to folding and is fragile and can be easily disintegrated in water and reused as a raw material pulp when used or used.

[0002]

2. Description of the Related Art Recently, for commercial, publication printing and printed matter including cover covers for so-called magazines, books, comic magazines (so-called book covers), shopping bags, fashion bags, or paper containers for medicines, cosmetics, etc. As the paper to be used has been highly demanded by consumers, it is strongly demanded that it has abrasion resistance, water resistance, and crease resistance as suitability for use. Further, from the viewpoint of environmental protection and resource protection, it is an important issue that these papers and paper boxes (containers) can be reused as raw materials by a recycling process using water after completing their purpose.

Conventionally, cast coated paper has been known as a paper exhibiting strong gloss. Cast coated papers are widely used in high-quality printed matter, cosmetic boxes, etc. because of their excellent gloss on the white surface. However, cast coated paper has a relatively low gloss at the printed part after printing, and has a drawback that it is apt to be rubbed and dirty after printing and blocking (which means a phenomenon of sticking) due to contact between printing surfaces. .

In order to solve the disadvantages of the cast coated paper according to the prior art described above, measures have been taken to provide a varnishing treatment to provide an overlayer after printing on the cast coated paper. However, since there are innumerable minute voids in the coating layer of the cast coated paper, the varnished varnish does not remain on the surface of the coating layer and penetrates into the coating layer, so sufficient surface property cannot be obtained. is the current situation.

Further, in order to solve the drawbacks of the cast coated paper, as disclosed in JP-A-3-260192, the cast coated paper has an ethylenically unsaturated bond in the coating composition. Although a method of using a composite of a polymer obtained by polymerizing a monomer and colloidal silica has been proposed, it is still insufficient in terms of abrasion resistance and water resistance, and the drawbacks of cast coated paper are sufficiently It has not improved yet.

On the other hand, a press-coated paper obtained by applying a large amount of resin to the surface of an ordinary coated paper or a printed matter thereof and finishing the gloss is treated with the above-mentioned resin after printing, so that the glossiness is high. It achieves its objective in obtaining a marked improvement in abrasion resistance and water resistance. However, press coat processing is complicated and has a limited production speed,
It has a drawback that the manufacturing cost is increased due to low productivity.

Further, the laminated paper processed by laminating plastic films such as polyethylene and polypropylene is also subjected to the above-mentioned processing after printing, so that the glossiness, abrasion resistance and water resistance are remarkably improved. Can be obtained. However, the laminated paper laminated with these plastic films does not easily disintegrate in water, and therefore requires a great deal of energy, time, and labor to be recovered and regenerated. It is treated as non-recoverable.

In Japanese Patent Laid-Open No. 3-166, a low-viscosity UV-curable resin liquid is applied to the surface of paper or coated paper, and then the coating film is cured by irradiating it with UV light to achieve a gloss finish. A method is disclosed. However, in this method, since the UV-curable resin liquid used has a low viscosity, the above-mentioned UV-curable resin liquid is applied to the surface of ordinary coated paper or cast coated paper, and UV-cured. However, the ultraviolet curable resin penetrates inside the coating layer and is not retained on the surface of the coating layer, so that it is not possible to obtain sufficient strong gloss as obtained with press-coated paper or laminated paper. Of course, it is possible to solve the above-mentioned drawbacks by increasing the amount of the UV-curable resin to be coated, but then, the resin layer is likely to be broken during binding, bag making and box making. It is not suitable because it causes another problem.

As described above, abrasion resistance, water resistance,
Appearance of strong gloss prints that are useful as commercial art prints, publication prints, packaging material prints, and paper container prints by solving all of the problems such as resistance to bending, possibility of recovery and use, and glossiness without complicated processes. However, in order to respond to this demand, the coating layer formed on the base paper has a dense structure by using kaolin as a main component, and is further applied on the printing ink and the printing surface. Styrene, which has a low glass transition temperature, is used as an adhesive in order to suppress the penetration of overprint varnish as much as possible and to obtain strong gloss.
A high-gloss printed matter has been proposed (Japanese Patent Application No. 6-4949), which comprises providing a base paper with a coating layer composed of a butadiene-based copolymer substance and phosphoric esterified starch and / or acetylated starch.

However, the coating composition obtained by the above-mentioned formulation has an appropriate viscosity so that an excellent coating layer can be formed by an off-machine coater such as a blade coater. In a gate roll coater capable of an on-machine coating method in which a base paper is made into a paper and then a coating layer is immediately provided, there is a problem that the coating material having the above formulation has too high a viscosity to be applied successfully.
In the on-machine coating method, the paper is dried with the pre-dryer of the paper machine, the coating is applied, and then the coated paper is dried with the after-dryer to finish, so the papermaking of the base paper and the coating of the base paper are performed. Since it can be carried out in one pass,
The coated paper can be manufactured extremely inexpensively and efficiently.

[0011]

As described above, the high-gloss printed matter has excellent high-gloss, abrasion resistance, water resistance, and crease resistance. Since it needs to have the property of being able to be disintegrated and recovered and reused as raw material pulp, the coating layer formed on the base paper has a dense structure by using kaolin as the main component, and further, printing ink and printing surface. It is essential to suppress the permeation of the overprint varnish applied on the top as much as possible and obtain a strong gloss, but the present inventors have found that the viscosity is low and a coating composition that can achieve the above-mentioned object by using a gate roll coater. In particular, as a result of earnestly examining adhesives,
When kaolin is used as a pigment and polyvinyl alcohol having a low degree of polymerization and modified starch are used together as an adhesive, a coating layer can be formed by a gate roll coater. When applied, the overprint varnish is retained on the surface, so that high glossiness can be obtained, and at the same time, the function of this overprint varnish can impart extremely excellent abrasion resistance and water resistance to the surface. The inventors have found that a highly glossy printed matter that can be collected and reused can be obtained, and completed the present invention.

An object of the present invention is to provide a pigment coating layer by an on-machine coating method using a gate roll coater, which has excellent high glossiness, abrasion resistance, water resistance and crease resistance. Further, it is to provide a strong gloss printed matter that can be recovered and used as a pulp raw material when broke or used.

[0013]

DISCLOSURE OF THE INVENTION The present invention relates to a base paper containing wood pulp as a main raw material and a pigment containing kaolin as a main component.
10-20 g / m of absolute dryness composed of polyvinyl alcohol having a degree of polymerization of 270 to 800 as an adhesive, and phosphoric esterified starch and / or acetylated starch
The coating layer ² is provided by an on-machine coating type gate roll coater, a printing surface is formed by printing on the coating layer surface, and an overprint varnish coating layer is further formed on the printing surface. Is a strong glossy printed matter.

The base paper containing wood pulp as the main raw material used in the present invention is a well-known long-cord multi-ply material using chemical pulp such as bleached hardwood kraft pulp and bleached softwood kraft pulp, and mechanical pulp such as GP, RGP and TMP. It includes high-quality paper, medium-quality paper, single-glossy paper, kraft paper, and other acidic paper, medium-quality paper, and alkaline paper that are produced by cylinder-type paper machines, fourdrin Yankee-type paper machines, and round-net paper machines. is there. The base paper contains papermaking auxiliary agents such as a paper-strengthening agent, a sizing agent, a filler and a retention aid.

The composition constituting the coating layer provided on the base paper of the present invention is composed mainly of a pigment and an adhesive, and the pigment plays a particularly important role. That is, in order to develop a high glossiness, it is possible to suppress the penetration of the solvent-based ink used for printing and the overprint varnish applied onto it to the inside of the coating layer as much as possible, and keep it on the surface of the coating layer. Since it is an important requirement for obtaining a high glossiness, it is necessary to use plate-like kaolin as a main component so that the pigments have a dense structure in the coating layer. As the kaolin, for example, special grade kaolin for paper coating, which is commercially available from Engelhard Co., Ltd. of the United States of America, ECC, Georgia Kaolin, Comarco of Australia, etc., primary and secondary kaolins can be used alone or in combination, Further, delaminated kaolin obtained by mechanically flaking kaolin particles having a laminated structure can also be blended.

However, in the present invention, because it is important to form a coating layer having a dense structure, the kaolin particles are fired at 900 ° C., the surface is melted, and the particles reaggregate,
Calcined kaolin which tends to exhibit a structure rich in porosity when blended in the coating layer, and a quaternary ammonium polymer salt produced by the method described in JP-A-62-267371 and JP-A-63-278986. , Poly (allyl ammonium chloride), polyamine, selected from polyamine, and an amount in the range of 0.03 to 0.15% based on the weight of polyelectrolyte kaolin is added to kaolin to be treated, and 0.77 to 0.95 ml.
The reason why kaolin having a sedimentation volume of / g and having a bulky structure such as calcined clay by such a chemical treatment cannot suppress the penetration of printing ink and overprint varnish into the coating layer. Is unsuitable.

On the other hand, the pigment which can be used in combination with kaolin for the present invention is not particularly limited, and ordinary pigments such as heavy calcium carbonate, light calcium carbonate, aluminum hydroxide, satin white, titanium dioxide and plastic pigments can be used. Mention may be made of inorganic pigments and organic pigments,
It can be appropriately used if necessary, but as described above, it is limited to a level that does not hinder the formation of a dense coating layer, that is, 5% by weight or less of the total pigment.

In the present invention, the polyvinyl alcohol used in the coating layer is a polyvinyl alcohol having a degree of polymerization of 300 to 800. Such a polyvinyl alcohol exhibits a remarkably excellent film property due to its strong binding force, and as a result, it can suppress the permeation of the printing ink and the overprint varnish applied on the printing surface as much as possible and obtain a high glossiness. In addition, the binding force of polyvinyl alcohol imparts remarkably excellent bending cracking property to the surface of the coating layer.

The degree of polymerization of the polyvinyl alcohol is 2
It is 70 to 800, preferably 300 to 600. If the degree of polymerization is less than 270, the viscosity becomes too low and the film properties are poor, so that the desired coating layer cannot be formed. On the other hand, polyvinyl alcohol having a degree of polymerization of more than 800 is not suitable because the viscosity of the coating material at the time of coating abruptly increases and a uniform coating layer cannot be formed by a gate roll coater. Of course, even when a polyvinyl alcohol having a high degree of polymerization is used, it is possible to reduce the coating viscosity by reducing the blending ratio of polyvinyl alcohol or reducing the concentration of the coating,
In this case, the paint excessively penetrates into the base paper, and it is impossible to form a coating layer having a high covering property on the base paper.

By using the above-mentioned polyvinyl alcohol as the adhesive agent, the gloss of the printed surface coated with the overprint varnish becomes high, but by further using the phosphate esterified starch and / or the acetylated starch, When it is laminated with polyethylene for the first time, it is possible to obtain an excellent high-gloss printed matter which is comparable. The phosphoric acid esterified starch and the acetylated starch used in the present invention further complement the film properties of the polyvinyl alcohol and contribute to the formation of a stronger continuous film, and can be used alone or in combination. .

When the pigment and the adhesive are used together, there is no strict limitation on the compounding ratio thereof, but in consideration of quality, operability, price, etc., 80 to 120 parts by weight of polyvinyl alcohol per weight of the absolutely dry pigment. %, Phosphate esterified starch and / or acetylated starch is preferably blended in an amount of 1 to 10% by weight. If necessary, auxiliary chemicals such as a dispersant, a water-proofing agent, an antifoaming agent, a lubricant, a coloring agent, and a preservative can be optionally added to the coating material to prepare the coating material by a known preparation method.

In order to impart a desired coatability to the coating layer, it is necessary to adjust the coating layer to have an absolute dry weight of 10 to 20 g / m ² . The coating layer has an absolute dry weight of 10g
If it is less than / m ² , the coating layer cannot completely cover the surface of the base paper, and as a result, the printing ink and the overprint varnish cannot be uniformly held on the surface, resulting in uneven gloss. On the other hand, the coating amount is 20g
If it exceeds / m ² , it becomes difficult to obtain a uniform coated surface by a gate roll coater, and as a result, the crease cracking property is also reduced. Furthermore, an increase in the coating amount increases the drying load on the dryer, so that it is necessary to reduce the papermaking speed, and as a result, the productivity is significantly reduced, which is not suitable.

The coated paper thus coated is dried by an after-dryer of a paper machine, machine calendered if necessary, and wound on a reel. After that, after slitting to the desired width of the base paper in the winder, printing is applied on the coated paper in the printing process, and even if overprint varnish is applied, a considerably high gloss can be obtained, but for the purpose of exerting the effect further The coated paper before printing is preferably subjected to a smoothing treatment with a surface finishing facility such as a super calendar. In this case, the glossiness of the surface-treated coated paper is a mirror surface of incident light flux / reflected light flux = 75 ° / 75 ° in order to make gloss and crease resistance after printing and application of overprint varnish proper. The gloss value is finished in the range of 40 to 70%. The higher the gloss value of the coated paper with such a surface finish, the higher the gloss after applying the overprint varnish, but if the gloss is excessively increased, the crease resistance may deteriorate.
It is preferable to finish in the above gloss range.

When the above-mentioned coated paper is printed, there are no restrictions on the original (characters / design), printing method, ink, printing conditions (printing pressure / speed), etc. at the time of printing. It is possible to freely perform planographic printing, intaglio printing and letterpress printing such as offset printing, gravure printing and flexographic printing, which are used for printed matter, printed matter for publication, printed matter for packaging materials and printed matter for paper containers.

After printing, an overprint varnish is applied by a conventional method as a glossing treatment. Many overprint varnishes such as a thermosetting varnish and an ultraviolet curable varnish are generally used for the overprint varnish, and any of them can be used for the strong gloss printed matter of the present invention. However, since the types of overprint varnishes are too wide, the UV curable varnish that is widely used for drawing overprint varnishes will be described below as an example.

The UV-curable varnish contains, as essential components, at least one monomer having a radical-polymerizable unsaturated double bond, or a prepolymer, and a sensitizer, and various resin colorants, waxes and the like are contained in the essential components. The above-mentioned additive is blended as necessary. That is, as the above-mentioned monomer having a radical-polymerizable unsaturated double bond, an alcohol obtained by esterifying (meth) acrylic acid with an alcohol such as ethylene glycol, polyethylene glycol, trimethylolpropane, pentaerythritol, phthalic acid, Ester of allyl alcohol to maleic acid, isocyanuric acid, etc., or glycidyl (meth)
Examples thereof include those obtained by esterifying acrylate.

As the prepolymer, epoxy resin esterified with (meth) acrylic acid, hydroxyl group-containing resin esterified with (meth) acrylic acid, hydroxyl group-containing alkyd, polyester resin or acrylic resin. And a (meth) acrylic acid-polyol esterified product are crosslinked with a diisocyanate compound.

Further, as the sensitizer, benzoin, benzoin methyl ether, benzoin ethyl ether,
Benzoin butyl ether, 2-allylbenzoin, 2
-Benzoin sensitizers such as chlorobenzoin, benzophenone, p-methylbenzoin, Michler's ketone, ketone sensitizers such as acetophenone, azo sensitizers such as azobisisobutyronitrile, anthraquinone, 2-chloroanthraquinone, Examples thereof include quinone-based sensitizers such as phenanthrene and sulfide-based sensitizers such as tetramethylthiuram monosulfide. These can be used alone or in combination of these sensitizers. The compounding amount of the sensitizer is adjusted within the range of 0.1 to 2.5% by weight based on the total solid content of the coating material.

These UV-curable varnishes can be adjusted to a desired viscosity by adding a known organic solvent. Further, instead of the organic solvent, water or a mixture of water and the organic solvent can be appropriately used.

As the ultraviolet irradiation, a high-pressure, medium-pressure or low-pressure ordinary mercury lamp or metal halide lamp is used, and the kind, size, number, etc. thereof are appropriately adjusted depending on the curing speed of the ultraviolet curing varnish. Therefore, it is possible to appropriately select and use an ultraviolet curable varnish having various component configurations according to each application. The UV-curable varnish can be applied by a known offset printing machine, roll coater, gravure coater, flexo coater, screen coater or the like. These coating devices are directly connected to the printing machine or installed separately from the printing machine for sheet or web processing, and in any case, they can be used in the present invention. The coating amount in that case is 0.3 to 10 g / m ² in terms of absolute dry weight in the present invention.
Is the range. If the coating amount is less than 0.3 g / m ² , it is difficult to obtain the high gloss desired by the present invention, while 10
If it exceeds g / m ² , there is a concern that the folding crack resistance may deteriorate.

As described in detail above, according to the present invention, as a pigment containing kaolin as a main component and an adhesive, the degree of polymerization is 270 to 270.
Obtained by providing a continuous and dense coating layer consisting of 800 polyvinyl alcohol and phosphate esterified starch and / or acetylated starch on the base paper with an on-machine coating type gate roll coater,
As a result, it is possible to suppress the penetration of printing ink and overprint varnish into the inside of the coating layer and retain them on the surface to obtain higher gloss, and to efficiently and inexpensively produce strong gloss printed matter.

The degree of polymerization used for the present invention is 27.
The combination of 0-800 polyvinyl alcohol and phosphate esterified starch and / or acetylated starch is
It effectively contributes to folding crack resistance, which is an important quality for forming a flexible coating layer. Furthermore, by applying an overprint varnish to the printed surface, it is possible to impart desired abrasion resistance and water resistance to the surface, and unlike the non-deaggregation property in water, which is a drawback of laminated paper with a film attached. ,
Since it is easily disintegrated in water, broke and used high-gloss printed matter can be recovered and reused as raw material pulp, so that the present invention provides an unprecedented strong-gloss printed matter.

[0033]

The present invention will be described in more detail with reference to the following examples, but of course the present invention is not limited thereto. In the following,% means% by weight.

EXAMPLE 1 Talc (trademark: SPE, manufactured by Arakawa Chemical Industry Co., Ltd.) was used as a wood pulp raw material consisting of 20% of 470 mlcfs softwood bleached kraft pulp and 80% of 470 mlcfs hardwood bleached kraft pulp.
Of reinforced rosin size of 0.3% and sulfuric acid band of 2% are added, and a base paper with a rice basis weight of 100 g / m ² is made by a fourdrinier multi-cylinder paper machine. ,
Then, with a gate roll coater installed in the middle of the drying process (pre-dryer and after-dryer) of the paper machine, the dry coating weight on one side was 12.0 g / m ² at a coating speed of 200 m / min. It was coated, dried with an after-dryer until the water content became 5.5%, passed through a machine calendar with 6 rolls and 5 nips own weight, and wound on a reel.

As the paint, kaolin (trademark: HT clay, manufactured by Engelhard, USA) as a pigment is used as a pigment.
Using 100%, 2.5% of an acrylic dispersion liquid (trademark: Poise 520, manufactured by Kao) was added based on the weight of the dry pigment, and the mixture was dispersed at a solid content concentration of 50% using a high speed deleter.
Further, as an adhesive, polyvinyl alcohol (trademark: GL0
3, degree of polymerization of 300, manufactured by Nippon Synthetic Chemical Industry), based on solid content, 100% based on the weight of the dry pigment, and similarly, phosphoric acid esterified starch (trademark: Neil gum A85, manufactured by Matsutani Chemical) 3%
Was added and mixed, and a lubricant (trademark: Nopcoat C-
108, made by San Nopco) 1.0%, antifoaming agent (trademark: DE
F122NS, manufactured by San Nopco) 0.03%, fluorescent dye (trademark: FoL, manufactured by Nippon Kayaku) 0.10% are added and mixed, and the pH is adjusted to 60% with a caustic soda solution having a concentration of 5% to 60%. The solid concentration was used.

The coated paper obtained by trimming with a winder is passed through a super calender and subjected to pressure contact treatment so that the surface of the coated paper has a specular gloss value of incident light flux / reflected light flux = 75 ° / 75 ° of 42%. Finished, coated paper for printing was produced. This coated paper was printed on one side using a Heidelberg KOR type offset printing machine and an ink (trademark: Super Apex (Indigo), manufactured by Dainippon Ink & Chemicals, Inc.), and after 24 hours, an acrylic ultraviolet curing type was applied to the printed surface. The isopropyl alcohol solution containing varnish (trade name: Seika Beam K-4085, made by Dainichi Seika) as a main component was coated with a gravure coater at an absolute dry weight of 2 g / m ² and then immediately irradiated with ultraviolet rays,
A strong gloss print was obtained. Further, without applying the printing on the surface of the coated paper, directly coated with the above ultraviolet curable varnish in the same manner,
Irradiation gave a strong gloss paper.

The white paper surface glossiness of the high-gloss paper and the print surface glossiness of the high-gloss printed matter thus obtained, abrasion resistance (rubbing suitability), water resistance (blocking resistance), crease resistance and damage The re-disintegration property of the paper was measured by the following method. Test method (1) Glossiness of white paper About the obtained strong glossy paper, the incident luminous flux / reflected luminous flux / reflected luminous flux = 75 ° / 75 by a gloss meter manufactured by Murakami Color Research Laboratory
The specular glossiness of ° was measured. (2) Printed surface glossiness The obtained high-gloss printed matter was measured by the Murakami Color Research Laboratory gloss meter to measure incident light flux / reflected light flux / reflected light flux = 75 ° /
The specular gloss of 75 ° was measured.

(3) Abrasion resistance (rubbing suitability) Printing after rubbing the printed portion of the high-gloss printed matter and the surface of the high-glossy paper 20 times with a load of 50 g / cm ² using a friction tester. The scratches and stains on the surface and the blank surface were judged according to the following criteria. ⊚: No scratches or stains are found. ○: No scratches or stains are noticeable for practical use. Δ: Scratches or stains are clearly visible. ×: Scratches or stains are noticeable.

(4) Water resistance (blocking resistance) For high-gloss printed matter and high-gloss paper, 1% in water
After soaking for 0 minute, two sheets having the same kind of gloss finished surfaces were superposed on each other, and then the state of the paper surface after standing for 3 hours with a load of 100 g / cm ² was judged according to the following criteria. ◯: No sticking at all Δ: Blocking occurs partially ×: Paper surfaces stick to each other, blocking occurs on the entire surface

(5) Resistance to Folding and Cracking Folding was performed with the printed surface of the strongly glossy printed material on the outside, and a metal roll having a weight of 2 kg was rolled thereon to make a crease, and the crease portion was judged according to the following criteria. . ◯: The coating layer at the crease is not cracked at all Δ: The coating layer is partially cracked, but there is no problem in practical use ×: Significant crease cracking does not endure practical use ○ △ and △ × indicate the middle of each .

(6) Re-disaggregation Using a pulp disintegrator manufactured by Kumagai Riki Kogyo Co., Ltd., JIS P 82
The paper was disintegrated according to 09. Samples of high-gloss printed matter and high-gloss paper cut into 1 cm squares were separately dried at an absolute weight of 2
4 g was sampled, put into a container of a disintegrator together with 2000 g of water (20 ° C.), and stirred for 3 minutes for re-disintegration. Then, the pulp slurry after the re-deagglomeration in this way was diluted to a concentration of 0.6%, and the deinking agent (trademark: DI-6
(10, made by Kao) is added to pulp at an absolute dry weight of 0.3%, and is deinked for 15 minutes at a temperature of 20 ° C. using a model floatator (trademark: FW-1K type, made by Kyoshin Sangyo). Processed. The pulp slurry after the deinking treatment was handmade, and it was visually observed whether or not there were undisaggregated substances (film pieces, paper pieces, etc.) on the handmade paper, and it was judged according to the following criteria. ◯: The handmade paper does not contain any undisintegrated matter at all, and is a uniform paper (good redisintegration property). Δ: The handmade paper contains a very small amount of undisintegrated matter,
It is a practically usable level. X: The handmade paper contains undisintegrated matter and cannot be put to practical use (no redisintegration).

Example 2 The surface of the coated paper for printing has an incident light flux / reflected light flux = 75 ° / 7.
A coated paper for printing was prepared in the same manner as in Example 1 except that it was finished with a super calendar so that the specular gloss value at 5 ° was 60%. A glossy paper was manufactured and its quality was evaluated.

Example 3 A coated paper for printing was prepared in the same manner as in Example 1 except that the coating amount of the coated paper for printing was set to 18 g / m ^2, and printing and varnishing treatment were performed to obtain a strong gloss. Prints and strong gloss papers were produced and their quality was evaluated.

Example 4 Instead of the phosphate esterified starch in the coating composition of Example 1, acetylated starch (trademark: National 70) was used.
(0338, manufactured by National Starch and Chemical Co., Ltd.) was used to prepare a coated paper for printing in the same manner as in Example 1, followed by printing and varnishing treatment to produce a high-gloss printed matter and a high-gloss paper. Evaluated the quality.

Example 5 Example 5 except that polyvinyl alcohol having a degree of polymerization of 800 (trademark: KP08, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) was used in place of polyvinyl alcohol having a degree of polymerization of 300 in the coating composition of Example 1. A coated paper for printing was prepared in the same manner as in 1, and was subjected to printing and varnish processing to produce a high-gloss printed matter and a high-gloss paper, and the quality thereof was evaluated.

Example 6 Pigment Kaolin (trademark: HT in the coating composition of Example 1)
Clay) instead of 100% kaolin (trademark: HT clay) and ground calcium carbonate (trademark: Softon 2200,
A coated paper for printing was prepared in the same manner as in Example 1 except that a mixture (made by Shiraishi Calcium) (kaolin: heavy calcium carbonate = 95: 5) was used. A strong gloss paper was manufactured and its quality was evaluated.

Comparative Example 1 Same as Example 1 except that a commercially available cast coated paper (trademark: Mirror Coat K Platinum, basis weight of 127.9 g / m ² , manufactured by Shin Oji Paper Co., Ltd.) was used as the coated paper for printing. After that, printing and varnishing treatment were carried out to produce high-gloss printed matter and high-gloss paper, and the quality was evaluated.

Comparative Example 2 Commercially available coated paper (new OK coat,
Printing and varnishing treatments were carried out in the same manner as in Example 1 except that a rice basis weight of 127.9 g / m ² made by Shin Oji Paper Co., Ltd. was used to produce strong gloss prints and strong gloss paper, and evaluate the quality. did.

Comparative Example 3 A coated paper for printing was prepared in the same manner as in Example 1 except that the coated amount of the coated paper for printing was set to 8 g / m ^2, and printing and varnishing treatment were performed to obtain a strong gloss. Prints and strong gloss papers were produced and their quality was evaluated.

Comparative Example 4 A coated paper for printing was prepared in the same manner as in Example 1 except that the coated amount of the coated paper for printing was 23 g / m ^2. Prints and strong gloss papers were produced and their quality was evaluated.

Comparative Example 5 Same as Example 1 except that oxidatively modified starch (trademark: Oji Ace, manufactured by Oji Corn Starch) was used in place of the phosphate esterified starch in the coating composition of Example 1. Then, a coated paper for printing was prepared, and printing and varnishing treatment were carried out to produce a high-gloss printed matter and a high-gloss paper, and the quality was evaluated.

Comparative Example 6 The procedure of Example 1 was repeated except that polyvinyl alcohol having a degree of polymerization of 1100 (trademark: KM11, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) was used instead of polyvinyl alcohol having a degree of polymerization of 300 in the coating composition of Example 1. A coated paper for printing was prepared in the same manner as in Example 1, and subjected to printing and varnish processing to produce a high-gloss printed matter and a high-gloss paper, and the quality was evaluated.

Comparative Example 7 Instead of polyvinyl alcohol (trademark: GL03, degree of polymerization 300, manufactured by Nippon Synthetic Chemical Industry) in the coating composition of Example 1, polyvinyl alcohol (trademark: SKR10H, degree of polymerization 250, manufactured by Shin-Etsu Chemical Co., Ltd.) A coated paper for printing was prepared in the same manner as in Example 1 except that (1) was used, and printed and varnished to produce a high-gloss printed matter and a high-gloss paper, and the quality was evaluated.

Comparative Example 8 A mixture of kaolin (trademark: HT clay) and ground calcium carbonate (trademark: Softon 2200, made by Shiraishi Calcium) instead of 100% of pigment kaolin in the coating composition of Example 1 (kaolin). : Coated paper for printing was prepared in the same manner as in Example 1 except that heavy calcium carbonate = 92: 8) was used, and printing and varnishing treatment were carried out to produce a strong-gloss printed matter and a strong-gloss paper. The quality was evaluated.

Comparative Example 9 The same printing as in Example 1 was performed on the coated paper used in Comparative Example 2, but the surface of the printed material was not varnished, but instead was melted low-density polyethylene (Sumitomo Chemical Co., Ltd.). Was laminated by a melt extruder to prepare a high gloss printed matter, and the quality was evaluated by using a coated paper which was not printed and laminated. When the cross section of this laminated paper was observed with a scanning electron microscope, the thickness of the polyethylene film layer was about 23 microns.

Comparative Example 10 The same printing as in Example 1 was carried out on the coated paper of Comparative Example 2, but the surface of the printed matter was not subjected to varnishing treatment, but instead was coated with a vinyl acetate ethylene adhesive to give a thickness of 15. A polypropylene film of micron was pasted, passed through two rolls having a flat surface, pressure-bonded, subjected to so-called dry lamination, and the quality was evaluated by using both coated and non-dried coated paper.

Table 1 shows the results obtained in Examples 1 to 6 and Comparative Examples 1 to 10.

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[Table 1]

As is clear from Table 1, the strong-gloss printed matter according to the present invention has a high glossiness comparable to that of polyethylene laminated paper on both the blank surface and the printed surface, and has important qualities such as abrasion resistance and water resistance. It is also suitable for breaking and can be easily disintegrated in water.
It can be reused as a pulp material (Examples 1 to 1)
6). On the other hand, when cast coated paper or normal coated paper, which is called high gloss paper, is used, the penetration of printing ink and varnish into the coating layer is remarkable and the desired glossiness is not obtained, and the coating layer is hard. Therefore, creases were generated (Comparative Examples 1 to 1
2). Furthermore, when the coating amount and composition of the coating layer do not meet the requirements of the present invention, some problems occur and it cannot be put to practical use (Comparative Examples 3 to 8). In addition, as a matter of course, the conventional laminated paper in which the film is laminated to exhibit the gloss cannot be disintegrated at all and is practically impossible to reuse (Comparative Examples 9 to 10).

INDUSTRIAL APPLICABILITY The present invention has an extremely high gloss and is excellent in abrasion resistance, water resistance and cracking suitability which are important qualities, and can be easily disintegrated in water so that it can be reused as a raw material pulp. Therefore, it is possible to provide a strong gloss print that can be suitably used as a commercial art print, a publication print, a packaging material print, a paper container print, and the like.

Claims (1)

[Claims] 1. A pigment containing kaolin as a main component and a polymerization degree of 270 as an adhesive on a base paper mainly made of wood pulp.
To 800 g of polyvinyl alcohol and phosphate esterified starch and / or acetylated starch of 10 to 20 g / m ² in absolute dryness is provided by an on-machine coating type gate roll coater. ,
A strong-gloss printed matter, wherein a printing surface is formed by printing on the surface of the coating layer, and an overprint varnish coating layer is further formed on the printing surface.