JP4772412B2 - Cosmetic cardboard - Google Patents

Description

  The present invention is used for transportation, store display, etc. after packing and boxing contents such as beer cans, beverage cans, and PET bottles with a caser (box making machine), and printing the date and time, lot number, etc. The present invention relates to a cosmetic cardboard box.

Conventionally, a general liner is used for a wrap-around type cardboard which is packed and boxed by a caser.
In the case of corrugated cardboard using general liners, there are no special problems in packaging and box making, but the whiteness and glossiness of general liners are low, so even if preprint printing is performed, there are problems with inferior cosmetics and printing effects. It was.

On the other hand, preprint printing using white coated paper or coated white balls in place of a liner is increasing in order to enhance cosmetics (Non-patent Document 1).
Court White Ball is a white paperboard and paper container 95 edition published by Paper Industries Times. 27. Since the preprint printing is performed on the coat layer side, the cosmetics and the printing effect by the preprint are high. However, when oil-based slow-drying type ink is used for inkjet ink for printing the date and time of manufacture after packing and boxing the contents, the ink printing part is contaminated because the ink absorption speed of the coat layer is slow. There was a problem that occurred.
This problem can be solved by using an oil-based quick-drying ink containing a volatile solvent in the inkjet ink. However, the fast-drying ink has a problem that the nozzle clogging of the inkjet is much easier than the slow-drying type. Yes.

Regarding the coated white ball, there are Patent Document 1 and Patent Document 2, and as corrugated cardboard on which ink jet printing is performed, there are Patent Document 3 and Patent Document 4. However, these documents describe means for solving the contamination of the printing part that occurs when ink-jet printing using oil-based slow-drying type ink-jet ink is applied to a wrap-around type corrugated cardboard pre-printed on a coated white ball. It has not been.
JP 2002-266283 A Japanese Patent Laying-Open No. 2005-163211 JP-A-8-080938 Japanese Patent Laying-Open No. 2005-047083 "Flexo Printing Overview" Processing Technology Study Group, October 24, 2000, P.I. 30

  In order to enhance the cosmetics as a corrugated cardboard, the present invention performs ink jet printing using an oil-based slow dry ink jet ink on a corrugated cardboard using a coated white ball having a whiteness of 70% or more and a specular gloss of 40% or more as a front side liner. An object of the present invention is to solve the contamination of the ink-jet printing section that occurs during application.

This invention for solving the said subject is invention of the cosmetics corrugated cardboard selected from the following (1)-(4), and the invention of the manufacturing method .

(1) Coated white balls are used for the front side liner, and pre-print flexographic printing or pre-print gravure printing is applied to the front side liner surface before corrugated cardboard packaging, and the contents are packed in a wrap-around type or A type. A cosmetic corrugated cardboard, wherein an absorbent layer for oil-based slow-drying type ink-jet ink is provided in advance in a portion of the corrugated cardboard that is further subjected to ink-jet printing after box assembly.

(2) The coated white ball has a coating layer composed of an adhesive and a pigment on the surface layer, the whiteness based on JIS P 8148 is 70% or more, and the 75-degree specular gloss based on JIS P 8142 is 40% or more. The cosmetic corrugated cardboard according to item (1), characterized in that it exists.

(3) After the box assembly, oleic acid absorption of inkjet printing planned portion (in accordance with JIS P 8140, instead using oleic acid water) is equal to or is 12g ^/ m ^2/15 seconds or more Cosmetic cardboard according to (1) or (2).

(4) The absorption layer for oil-based slow-drying inkjet ink provided in the planned inkjet printing location is a layer formed at the time of the preprint printing, and the whiteness of the absorption layer is based on JIS P 8148. The cosmetic cardboard according to any one of (1) to (3), wherein the whiteness is 70% or more.

  According to the present invention, the coated white ball and the oil-based slow-drying type inkjet ink can be used at the same time, and the cosmetic properties of the cardboard are greatly improved.

The cardboard targeted by the present invention is a wrap-around type cardboard such as a beer can, a beverage can, and a plastic bottle sold on a case-by-case basis.
Corrugated cardboard sold on a case-by-case basis has a significant impact on sales due to the cosmetics at the store. Since the corrugated cardboard of the present invention uses coated white balls for the front side liner, the whiteness is not less than 70% (general liner is not more than 20%) and the specular gloss is not less than 40% (general liner is not more than 9%). In addition, it is possible to increase the mirror gloss to 60% or more by applying OP varnish during preprint printing.

However, the coated white ball has a coating layer of 10 to 30 g / m ² made of an adhesive and a pigment on the surface layer in order to increase whiteness and specular gloss.
The coating layer is oleic acid absorption in the Cobb method becomes 12g / m ^2/15 seconds or less based on JIS P 8140, to slow the absorption of oily slow drying ink, contamination occurs in the inkjet ink locations.

The corrugated board of the present invention is provided with an oil-based slow-drying type ink-jet ink absorbing layer using white ink or the like at the time of pre-print printing at a location where ink-jet printing is performed after box assembly.
The white ink that forms the oil-based slow-drying inkjet ink layer of the present invention contains a white pigment, a binder resin, and water as main components, and an aqueous medium that is used as necessary.

    In the corrugated cardboard of the present invention, the white pigment used in the white ink for forming the oil-based slow-drying inkjet ink absorbing layer includes titanium dioxide (anatase, rutile), aluminum hydroxide, barium sulfate, calcium carbonate, Examples include extender pigments such as amorphous silica. As titanium dioxide, what is generally used as a pigment of printing ink can be used. Moreover, 30-85 mass parts is preferable in 100 mass parts of white ink, and, as for content of white pigments, such as titanium dioxide, More preferably, it is 50-80 mass parts.

    In the cardboard of the present invention, a water-soluble or water-dilutable resin is used as the binder resin used in the white ink for forming the oil-based slow-drying inkjet ink absorbing layer. As the water-dilutable resin, natural resins and synthetic resins can be used. For example, starch derivatives, casein, shellac, polyvinyl alcohol derivatives, acrylic resins and maleic resins are used. More specifically, water-soluble acrylic resin, water-soluble styrene-acrylic resin, water-soluble styrene-maleic acid resin, water-soluble, copolymerized using acrylic acid or methacrylic acid and its alkyl ester or styrene as the main monomer component. A water-soluble styrene-acrylic acid-maleic acid resin, a water-soluble polyurethane resin, and a water-soluble polyester resin are preferably used.

    The content of the binder resin is preferably 1 to 25 parts by mass, more preferably 1 to 15 parts by mass in 100 parts by mass of the white ink in combination with the film forming agent. When the content of the binder resin exceeds 25 parts by mass, the amount of oleic acid absorbed decreases, and contamination of the ink jet printing part with the oil-based slow dry ink jet ink cannot be prevented.

    Examples of the aqueous medium that can be used in the white ink of the present invention include water or a mixture of water and a water-miscible solvent. Examples of the water-miscible solvent include lower alcohols, polyhydric alcohols, and alkyl ethers or alkyl esters thereof. Specifically, lower alcohols such as methyl alcohol, ethyl alcohol, normal propyl alcohol and isopropyl alcohol, polyhydric alcohols such as ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol and glycerin, ethylene glycol monomethyl ether, ethylene Examples include glycol monoethyl ether, ethylene glycol monoacetate, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monoacetate, diethylene glycol monomethyl ether, dipropylene glycol monomethyl ether and the like.

    In addition to the components shown above, the white ink used in the present invention includes a film-forming agent, a pigment dispersant or a pigment dispersion resin, an anti-blocking agent, a wetting agent, a viscosity adjusting agent, a pH adjusting agent, if necessary. Various additives such as an antifoaming agent and a general surfactant can be appropriately selected and used.

    Using these various materials, the white ink used in the present invention can be produced by mixing a white pigment, a binder resin, water, a water-miscible solvent as necessary, and a pigment dispersant or pigment dispersion resin. In general, a method of adding and mixing an additive, water, a water-miscible solvent as necessary, and the remainder of a predetermined material is generally used.

    In addition, the white ink used in the present invention is obtained by mixing the necessary amounts of each of the above components and mixing and dispersing with a high-speed stirrer such as a homomixer or a lab mixer, or a dispersing machine such as a three-roll mill or a bead mill. It can be easily obtained.

    The white ink used in the present invention can be provided with an inkjet absorbing layer on a coated white ball by a flexographic printing method. The whiteness of the absorbing layer formed with white ink is 70% or more, which is almost the same as that of a coated white ball, so that the cosmetic properties of the cardboard are not adversely affected.

  EXAMPLES Hereinafter, although this invention is demonstrated according to an Example, this invention is not limited by these. Unless otherwise specified, “part” means “part by mass”.

<Example 1>
A pre-print flexographic printing was performed on a coated white ball [Oji Coated White Ball 180 (MF180)] for use as a front liner.
In preprint printing, the pattern is printed in four colors, and the flexo white ink [titanium dioxide = 80 parts, isopropyl alcohol + propylene glycol monomethyl ether = 10 parts, acrylic (co) polymer = 10 at the place to be inkjet printed after box assembly. Part] to improve the ability to absorb oleic acid.
Next, using a corrugator, the base paper was used as a front side liner, and a back side liner [Oji ABM170 liner] and a middle core [Oji middle core 125] were used to produce a corrugated sheet of B flute.
Next, the corrugated cardboard sheet was punched out with a box making machine to produce a wraparound type corrugated cardboard.
Next, the contents are packed with the above cardboard, and after assembling the box, oil-based slow-drying ink (product name = HD black, Kishu Giken Co., Ltd., main components: oleic acid = 50-60%, fatty acid ester = 30-40) %, Azine compound = 10 to 20%).
Next, 30 seconds after the end of printing, the inkjet printing part was rubbed with tissue paper, and the contamination state of the printing part was confirmed. The results are shown in Table 1.

<Comparative Example 1>
The preprint printing was performed in the same manner as in Example 1 except that the flexo white ink was not printed on the portion to be inkjet printed after the box was assembled.

<Comparative example 2>
Apply flexo white ink with low titanium dioxide, binder-rich ink (titanium dioxide = 70 parts, isopropyl alcohol + propylene glycol monomethyl ether = 10 parts, acrylic (co) polymer = 20 parts) and absorb oleic acid The same procedure as in Example 1 was performed, except that a flexographic printing part that did not have a high performance was formed.

<Comparative Example 3>
It implemented similarly to the comparative example 1 except using the back side liner [Oji ABM170 liner] used in Example 1 for the front side liner.

<Result>
The results of Examples and Comparative Examples are shown in Table 1. In addition, the oleic acid absorption was measured using oleic acid instead of water according to JIS P 8140. 12 g ^/ m significant ink contamination is less than 2/15 sec.

* 1) Glossiness of the preprinted printing part is measured, 70% or more is evaluated as ◎, 40 % to less than 70% as ○, 10 % to less than 40% as Δ, and less than 10% as ×.
* 2) preprinted measure the glossiness of the non-printing portion, more than 40% ◎, ○ less than 20% to 40%, less than 10% to 20% △, to less than 10% and ×.
* 3) Apply oil-based slow-drying inkjet ink, rub with tissue paper after 30 seconds, ◎ if the ink transfer to the tissue paper can not be confirmed at all, ◎ if it can be confirmed slightly, transfer can be confirmed, printing If the contamination of the surface can be confirmed, it is marked with x.
* 4) The amount of oleic acid absorbed was measured in 15 seconds because the shorter the absorption time, the higher the correlation with ink contamination.

  The corrugated cardboard of the present invention can enhance the cosmetics and printing effect by preprinting on the coated white ball, and further prevents the ink-jet printing from being stained after the contents are packed and boxed. Can be used as cardboard.

Claims (4)

On the front side liner surface to be coated white ball 75 degree specular gloss of 40% or more based on JIS P 8142 having a coating layer consisting of the adhesive and pigment are used, prior to cardboard laminated on said side liner surface preprint flexo printing is performed, after the assembled box pack the contents of the wraparound type or a type, the cardboard inkjet printing is performed further on said side liner surface, ink jet printing planned portion of said surface side liner surface A cosmetic corrugated cardboard characterized in that a flexo white ink coating layer comprising a white pigment and a binder resin is provided as an absorbing layer for an oil-based slow-drying type inkjet ink. Said oleic acid absorption in the absorption layer for oily slow drying ink-jet ink jet printing planned portion (in accordance with JIS P 8140, using oleic acid instead of water) is the 12g / m ^2/15 seconds or more The cosmetic cardboard according to claim 1, wherein: Coated white balls with a 75-degree specular gloss of 40% or more based on JIS P 8142, which has a coating layer composed of an adhesive and a pigment on the surface layer, are used for the front side liner. The preprinted flexographic printing is performed, and after the contents are packed and assembled in a wraparound type or A type, the front liner surface is further subjected to inkjet printing with an oil-based slow-drying inkjet ink. 2. A method for producing a cosmetic corrugated cardboard according to claim 2, wherein a flexo white ink coating layer comprising a white pigment and a binder resin is applied to an ink jet printing scheduled portion on the surface liner surface at the time of the preprint flexographic printing. A method for producing a cosmetic corrugated cardboard, characterized in that it is formed as an absorbing layer for ink . The oil-based slow-drying inkjet ink absorbing layer formed by applying flexo white ink has an oleic acid absorption amount (using oleic acid instead of water in accordance with JIS P 8140) of 12 g / m ² / The method for producing a cosmetic corrugated cardboard according to claim 3, wherein the layer is an absorbing layer for 15 seconds or more.