JP2014121827A - Printed liner or printed corrugated cardboard, liner for a printed liner or corrugated cardboard for a printed corrugated cardboard, and method for manufacturing a printed liner or printed corrugated cardboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed liner or printed corrugated cardboard capable of preserving tactile textures of raw papers and yielding excellent printed ink color development characteristics and printed surface finishes.SOLUTION: The provided printed liner or printed corrugated cardboard is a printed liner or printed corrugated cardboard obtained by printing the surface of a liner or corrugated cardboard wherein at least a partial region is printed on an aluminum sulfate-adhered region. A liner for a printed liner or corrugated cardboard for a printed corrugated cardboard wherein aluminum sulfate is adhered to at least a partial region of the surface of a liner or corrugated cardboard is also provided.

Description

The present invention relates to a printing liner or printing cardboard. The present invention also relates to a liner for a printing liner or a corrugated cardboard for printing corrugated cardboard. Furthermore, the present invention relates to a method for producing a printing liner or printed cardboard. In particular, it is a technology relating to a printing liner or printing cardboard that maintains the texture of the base paper and is excellent in ink color development in printing and finished on the printed surface.

Printing liners or printed cardboards are finally processed into cardboard boxes and used as packaging and transportation packages. Recently, cosmetic printing has been applied to differentiate the content products, and they have an exhibition function. The demand is increasing and high print quality is required. However, when printing on a liner or cardboard, the print quality is a problem due to the low smoothness.
In addition, cosmetic printing may be performed by printing a large amount of white ink on a brown liner and then printing other colors. In the case of such a printing method, it is necessary to print a large amount of expensive ink in order to make the brown liner surface white and improve the finish of other colors such as red and indigo, but when the ink adhesion amount is reduced However, there is a demand for a liner that has a high whiteness in the white ink printing portion and a good finish of other color inks.

As a method for obtaining a liner excellent in printing as described above, a method is disclosed in which a coating agent formed by blending an inorganic pigment, a binder, and a surface sizing agent on the liner surface is applied (Patent Document 1). However, providing the inorganic pigment coating layer on the liner surface has a problem of impairing the uncoated texture inherent in the liner.
On the other hand, a method of applying a water-soluble surface coating agent to the liner surface (Patent Document 2), a method of applying or printing a nonionic water-soluble resin and an aqueous coating agent containing a calcium salt as a dissociable polyvalent metal salt ( Patent Document 3) discloses a method of applying an aqueous composition containing a cationic resin to the surface of a liner or cardboard (Patent Document 4). Although these methods do not cause the problem of impairing the non-coating texture inherent in the liner, satisfactory color development and printed surface finish cannot be obtained, and further improvements are required. It was.
In Patent Document 2, the water-soluble surface coating agent is preferably selected from the group consisting of polyvinyl alcohol, starch, polyacrylamide and styrene-butadiene copolymer, and is exemplified.
In Patent Document 3, it is preferable to use a cellulose derivative or an alkyl ketene dimer as the nonionic water-soluble resin, and calcium formate as the calcium salt, and examples thereof are also exemplified.
Patent Document 4 states that the cationic resin is a polyamine-based resin and that the aqueous composition preferably contains a cationic resin and a polyacrylamide-based resin.

JP-A-2005-89931 JP 2005-200773 A JP2008-31579 JP2007-321307

The present invention relates to a printing liner or printing corrugated cardboard, and provides a printing liner or printing corrugated cardboard that maintains the texture of the base paper and is excellent in ink color development and printing surface finish.

As a result of diligent research to solve such problems, the present inventors have found that polyvalent metal salts tend to be excellent as a material for treating the liner surface, and as a result of further research, sulfate bands The present invention has been completed by finding out that the problem can be solved by using.
The printing liner or printed cardboard having the surface printed according to the present invention is characterized in that at least a partial area is printed in an area to which a sulfuric acid band is attached.

It is preferable that the adhesion amount of the sulfuric acid band is 0.15 g / m ² or more.
The printing is preferably a flexographic method.
It is preferable that the sulfuric acid band is attached by flexographic printing.
The sulfuric acid band is preferably attached by a coating machine.
The liner for printing liner or the corrugated cardboard for printing corrugated board according to the present invention is characterized in that a sulfate band is attached to at least a partial region of the surface.
It is preferable that the adhesion amount of the sulfate band in the partial region is 0.15 g / m ² or more.
Furthermore, the method for producing a printing liner or printed cardboard according to the present invention is characterized in that a sulfuric acid band is attached to at least a partial region of the liner or the surface of the cardboard and then printing is performed.
The printing liner produced according to the present invention may be used for corrugated cardboard.

According to the present invention, it is possible to provide a printing liner or printing cardboard that maintains the texture of the base paper and is excellent in ink color development in printing and printing surface.

In the printing liner or the printed cardboard of the present invention, at least a partial region of the printing liner or the printed cardboard is printed in a region where the sulfuric acid band is attached. Details will be described below.

(Sulfuric acid band treatment solution)
In the present invention, it is necessary to form a region where a sulfate band is attached to a liner or cardboard. The attachment method is not particularly limited, but it may be applied by applying a sulfuric acid band as a treatment liquid in an aqueous solution state. In addition, the sulfate band treatment liquid contains various starches such as oxidized starch, esterified starch, cold water soluble starch, cationic starch, and enzyme-modified starch, and proteins such as casein, soy protein, and synthetic protein as necessary. , Cellulose derivatives such as carboxymethyl cellulose and methyl cellulose, polyvinyl alcohol and its modified products, polyacrylamide resins, styrene-butadiene copolymers, conjugated diene polymer latexes such as methyl methacrylate-butadiene copolymers, acrylic polymers Resin obtained by reacting amines with epihalohydrins (eg, dimethylamine epichlorohydrin resin), cationic vinyl monomer alone, such as polymer latex, vinyl polymer latex such as ethylene-vinyl acetate copolymer Polymerized resin (eg polydiallyldimethyla It is possible to use cationic resins such as monium chloride, polyallylamine salts), polyvinylamine resins, polyethyleneimine resins, polyalkylene polyamide resins, polyamide polyurea resins, and one or more of these Two or more kinds can be appropriately selected and used in combination.

In addition, as necessary, the sulfuric acid band treatment solution includes a dispersant, caustic soda, aqueous ammonia and other pH adjusters, antifoaming agents, preservatives, fluorescent dyes, mold release agents, dyes, water resistance agents, and fluid modification. Various auxiliary agents such as an agent, a thickening water-retaining agent, a coloring pigment, a dye, an antioxidant, an anti-aging agent, an ultraviolet absorber, and a water repellent can be added as appropriate.
When other materials are used in combination, a cationic material is preferably used in combination. If it is a cationic material, the compatibility with a sulfuric acid band is good, and mixing of a liquid is easy.
The blending amount when other materials are used in combination and added is 1000 parts by mass or less, more preferably 500 parts by mass or less, and particularly preferably 250 parts by mass or less with respect to 100 parts by mass of the sulfuric acid band. When the blending amount of the other material is 1000 parts by mass or more, the ratio of the sulfuric acid band is relatively decreased, so that a desired effect may not be obtained, which is not preferable.

The solid content concentration of the sulfuric acid band of the treatment liquid is not particularly limited and can be appropriately set in consideration of the drying conditions after coating, the coating amount, and other factors. %, Preferably 1 to 30% by mass. Even when other materials are used or added together, the above-mentioned solid content concentration is preferable.

The viscosity of the treatment liquid is not particularly limited and can be appropriately set in consideration of the application method of the treatment liquid of the sulfuric acid band and other factors. It is preferably 4 to 25 seconds, and particularly preferably 8 to 20 seconds. If the viscosity is in the range of 5 to 25 seconds, it can be uniformly applied onto the liner base paper.
In addition, about the adjustment method of a viscosity, it can adjust by adjusting solid content concentration and mix | blending the other material mentioned above suitably.

The adhesion amount (dry coating amount) of the sulfuric acid band is not particularly limited and can be appropriately set in consideration of the sizing degree of the base paper and other factors, but is 0.15 g / m ² or more. And excellent ink color development and printing surface can be obtained. The upper limit of the adhesion amount is not particularly limited, but excessive adhesion not only saturates the obtained effect but also may adversely affect the uniformity of the printed surface, so it is 2.0 g / m ² or less. Preferably, it is 0.15-1.5 g / m ² .

The method for applying the treatment solution of the sulfuric acid band is not particularly limited, but for example, a rod coater, an air knife coater, a blade coater, a bar coater, a gate roll coater, a roll coater such as a size press, a bill blade coater, a Velvapa coater, Ordinary coating machines such as spray coater, curtain coater, and calendar coating, and printing machines such as gravure printing and flexographic printing can be used as long as the effects of the present invention are not impaired. As the coating method, it is preferable to use a flexographic printing machine.

When using a coating machine as the coating method for the treatment liquid, the coating machine attached to the paper machine or the coating machine independent of the paper machine may be used, but it comes with the paper machine for productivity reasons. It is preferable to apply with a coating machine.

When using a flexo printing machine as a treatment liquid application method, the flexo printing machine can be divided into three types, stack type, line type, and central impression type, depending on how the printing units are arranged. can do.
When applying a sulfuric acid band with a flexographic printing machine, it is preferable to install a printing unit that applies a sulfuric acid band before supplying colored ink, that is, at the place where it is first applied to paper. In order to further improve the color developability of the ink portion, it can be installed between the color ink units.

It is preferable to pass the drying step after applying the sulfuric acid band. As a drying method, a method of applying cold air or room temperature air to the coated surface, a method of applying hot air using a hot air dryer, a method of irradiating infrared rays using an IR dryer, and the like can be used.

(Sulfuric acid band application area)
In the printing liner or printed cardboard of the present invention, it is important to apply a sulfate band to at least a partial region of the liner or cardboard. The application region can be applied to the entire surface of the liner or cardboard, or can be applied to a specific partial region. In particular, according to the effects of the printing liner or printing corrugated cardboard of the present invention, the ink coloring property in printing and the printing surface are affected. Therefore, the sulfuric acid band should be applied only to the region where the printing ink adheres. However, it is preferable from the viewpoint of resource saving and manufacturing cost reduction.

(Printing method)
The printing liner or printing corrugated board of the present invention is printed on the area where the sulfuric acid band is adhered, but the printing method is not particularly limited. For example, in addition to lithographic printing typified by offset printing, intaglio printing typified by gravure printing, relief printing typified by flexographic printing, etc., screen printing, inkjet printing, toner printing, etc. do not impair the effects of the present invention. Although it can be used in a range, it is particularly preferable to use flexographic printing.
Flexographic printing presses are classified into three types, stack type, line type, and central impression type, depending on how the printing units are arranged, but any type can be used.
In addition, examples of the flexographic ink include alcohol type, cosolvent type, aqueous type, and UV curable type. Among these flexographic inks, the aqueous type is excellent in terms of safety, workability, and economy, Particularly preferred.

If printing is performed on the area where the sulfuric acid band is attached, the reason for the excellent ink color development and the printed surface finish is not clear, but the sulfuric acid band present on the surface and the components of the printing ink have some combination, and the ink This is thought to be due to preventing the penetration of the components into the base paper.

(Liner base paper manufacturing method)
The liner base paper used for the printing liner or printing corrugated cardboard of the present invention is not particularly limited as a constituent pulp. For example, one kind or two or more kinds of chemical pulp, mechanical pulp, waste paper pulp and the like are appropriately mixed. Used. Furthermore, a base paper having a multilayer structure formed by combining two or more pulp layers can be used. Further, as the cardboard used in the present invention, those using the above-mentioned liner base paper are used. In addition, sizing agents, paper strength agents, chemical fixing agents, filter media, fillers, dyes, etc., are added to the liner base paper and corrugated cardboard as needed, as long as they do not impair the effects of ink color development and printing surface finish. It can also be added as appropriate.

The paper making method of the liner base paper is not particularly limited, and examples of the wet paper machine include commercial machines such as a round net type paper machine, a short net type paper machine, a long net type paper machine, and a twin wire type paper machine. A paper machine of a scale can be used, and various general paper making methods, which are general liner base paper manufacturing methods, can be appropriately selected and used.
Roller coaters such as rod coaters, air knife coaters, blade coaters, bar coaters, gate roll coaters, size presses, bill blade coaters, velvapa coaters, spray coaters Further, the surface treatment of the base paper can be performed using a normal coating apparatus such as curtain coater or calendar coating, or a printing machine such as gravure printing or flexographic printing.

The materials constituting the surface treatment agent used for the surface treatment of the base paper include inorganic and organic pigments such as kaolin, calcium carbonate, talc, titanium dioxide, synthetic silica, aluminum hydroxide, plastic pigment, polystyrene resin, urea formaldehyde resin, etc. Synthetic polymer fine particles, various latexes such as styrene-butadiene and vinyl acetate-acrylic, various surface strength agents such as polyvinyl alcohol, starch and polyacrylamide, various surface sizing agents such as styrene and olefin, thickeners Various auxiliary agents such as an antifoaming agent, water-proofing agent, mold release agent, and rust preventive agent, and known and publicly used materials used in the production of liner paper can be used as necessary.

As for the liner base paper, there is no problem if the base paper is used for the printing liner or printing corrugated cardboard of the present invention as it is, but before using it, use a machine calendar, soft calendar, super calendar, Yankee dryer, etc. The base paper can be smoothed in advance.

(Corrugated cardboard manufacturing method)
The corrugated cardboard used in the printing corrugated cardboard of the present invention is not particularly limited, but generally used is a corrugator machine that is cut into an appropriate size after the liner base paper and the core paper are pasted together. It is done.

(Printing cardboard manufacturing method)
The corrugated cardboard using the printing liner of the present invention is generally cut into an appropriate size into a corrugated cardboard after the printing liner and the core paper are bonded with a corrugator machine. Accordingly, the printed corrugated board of the present invention includes a corrugated board using a printing liner, and a cardboard that has been directly printed. Further, even when printing is further performed on the cardboard using the printing liner of the present invention, the effect is not impaired, and a cardboard having excellent print quality can be provided.

Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these ranges. In the examples, “parts” and “%” indicate parts by mass and mass% unless otherwise specified.

Example 1
(Preparation of treatment liquid)
A sulfuric acid band (trade name: liquid aluminum sulfate / manufactured by Oji Materia Co., Ltd.) was diluted to a solid concentration of 20% to obtain a treatment liquid.
(Preparation of printing liner)
With respect to the obtained treatment liquid, the adhesion amount (solid content application amount) is 0.40 g / with respect to the tea liner base paper (density: 0.8 g / cm ³ , rice basis weight: 160 g / m ² , whiteness 15%). coated with a wire bar so as to m ^2, and dried to obtain aluminum sulfate coated paper. Thereafter, a white ink (trade name: HW913AQP65F white DM / manufactured by Toyo Ink Co., Ltd.) with a solid content concentration of 35% is wired on the sulfuric acid band coated paper so that the coating amount (solid) is 6 g / m ^2. A printing liner was obtained by applying with a bar.

Example 2
In Example 1, the treatment solution was mixed with 100 parts of a sulfuric acid band and 43 parts of a cationic polyacrylamide resin (trade name: HG5304 / manufactured by Seiko PMC) and diluted to a solid content concentration of 20%. Except for the above, a printing liner was obtained under the same conditions as in Example 1.
Example 3
Except that the treatment liquid obtained in Example 2 was applied to a tea liner base paper with a wire bar so that the coating amount (solid) was 0.20 g / m ² and dried, all the same as in Example 2. Under conditions, a print liner was obtained.

Comparative Example 1
In Example 1, the treatment liquid was mixed with 100 parts of a water-soluble modified polyamine resin (trade name: DK6852 / Seiko PMC), and 18 parts of cationic polyacrylamide resin was diluted and solid concentration. A printing liner was obtained under the same conditions as in Example 1 except that the content was 20%.
Comparative Example 2
In Example 2, a printing liner was obtained under the same conditions as in Example 3 except that calcium formate was used instead of 100 parts of the sulfuric acid band.
Comparative Example 3
In Example 2, a printing liner was obtained under the same conditions as Example 3 except that zinc sulfate was used instead of 100 parts of the sulfuric acid band.
Comparative Example 4
In Example 2, a printing liner was obtained under the same conditions as in Example 3 except that magnesium nitrate was used instead of 100 parts of the sulfuric acid band.
Comparative Example 5
A printing liner was obtained under the same conditions as in Example 1 except that the treatment liquid was not applied.

(Preparation of printing liner by flexographic printing machine)
Example 4
In the first printing unit of the central impression type flexographic printing machine (trade name: Prefine, manufactured by Ficher & Krecke), the treatment liquid with a solid content concentration of 20% obtained in Example 2 is applied to a mesh roll of 355 lines / inch. After being supplied and scraped with a doctor, the coating amount was measured, transferred to a flexographic printing plate, and printed on a tea liner base paper (trade name: ABO170 / manufactured by Oji Materia Co., Ltd.) at a speed of 170 m / min. Subsequently, it was dried with a hot air dryer, and then white ink (trade name: HW913AQP65F white DM / manufactured by Toyo Ink Co., Ltd.) was printed using a 200-line / inch mesh roll and dried with a hot air dryer to obtain a printing liner. .

Comparative Example 6
In Example 4, a printing liner was obtained under the same conditions as in Example 4 except that the treatment liquid was changed to the treatment liquid having a solid content concentration of 20% obtained in Comparative Example 1.
Comparative Example 7
A printing liner was obtained under the same conditions as in Example 4 except that the treatment liquid was not applied.

The following evaluation was performed on the obtained treatment liquid and the printing liner, and the obtained results are shown in Tables 1 and 2.

"Viscosity of treatment liquid"
The viscosity of the treatment liquid having a solid content concentration of 20% was measured by the following method (Zahn cup method).
In a treatment liquid kept at 25 ° C., Zahn cup No. 4 having an orifice diameter of 4 mm was used. 4 is submerged, and the submerged cup is quickly pulled up by a certain operation, and the time from the moment when the bottom surface of the cup is separated from the liquid surface until the flow of the processing liquid flowing out from the orifice is interrupted is measured.

"Ink coloring"
The ink coloring property of the printing liner was visually evaluated as follows.
◎: Excellent ink color development and good print finish ○: Slightly good ink color development and slightly good print finish △: Slightly poor ink color development and slightly poor print finish ×: Ink color development Inferior, poor print finish

In any of the examples, by applying the sulfuric acid band defined in the present invention, a print liner having excellent ink color development in printing and a good print finish was obtained.

Claims (8)

A printing liner or printed cardboard, wherein at least a part of the printing liner or printed cardboard having a surface printed on the surface of the liner or cardboard is printed in a region to which a sulfate band is attached. The printed liner or printed cardboard according to claim 1, wherein the amount of the sulfuric acid band attached is 0.15 g / m ² or more. 3. The printing liner or printed cardboard according to claim 1, wherein the printing is a flexographic method. The printing liner or cardboard according to any one of claims 1 to 3, wherein the sulfuric acid band is attached by flexographic printing. The printing liner or cardboard according to any one of claims 1 to 3, wherein the sulfuric acid band is attached by a coating machine. A liner for printed liners or a corrugated cardboard for printed cardboard, wherein a sulfuric acid band is attached to at least a part of the surface of the liner or corrugated cardboard. The liner for printing liners or the corrugated board for printing corrugated boards of Claim 6 whose adhesion amount of a sulfuric acid band is 0.15 g / m < ² > or more. A method for producing a printing liner or printed cardboard, comprising: applying a sulfuric acid band to at least a partial region of the surface of the liner or cardboard;