JP2019123764A - India ink and printed matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the black density, crush white characters, and read a POS code error even in an ink having a four-color composition of black ink, indigo ink, red ink, and yellow ink. There is no risk of line cracking or line cracking, the number of printings does not increase, the process and cost are favorable, drying defects are less likely to occur, and ink ink with good ink adhesion and this ink ink are used. The purpose is to provide the printed matter. SOLUTION: Ink ink is provided by mixing inks other than black ink in an amount of 2 or more and 200 or less with respect to 1000 process black inks in terms of weight ratio. [Selection diagram] None

Description

  The present invention relates to black ink among printed materials such as paper containers and inks such as offset ink used for the printing.

  In many cases, the ink used for offset printing consists of four colors of yellow, red, yellow and black. It was not easy to increase saturation and density with this four color combination. Therefore, as in Patent Document 1, a printing method has been developed that uses red, orange, yellow, green, green, purple, and black inks and has high saturation and excellent color reproducibility.

  However, this increases the number of printings by the type of ink, which is not preferable in terms of process and cost. Not only that, it is also difficult to increase the black density even with the technique of Patent Document 1, and measures have been taken to increase the amount of ink buildup. However, in this case, there is a problem that the white characters may be crushed, a POS code reading error may easily occur, or the ruled lines may be broken.

  As another response, there are also cases in which two printings in which the black plate is printed twice are used, but this increases the number of times of printing, which is not preferable in terms of process and cost. As another measure, there is a method of drawing a net with black ink or red ink in the black part. However, in this method, after printing black ink, since the base ink and red ink are printed from above, drying failure is likely to occur, and as a result, the adhesion of the ink may be deteriorated.

Unexamined-Japanese-Patent No. 2-32890

  According to the present invention, even in the case of an ink having a four-color configuration of black ink, black ink, red ink and yellow ink, black density is increased, collapse of white characters occurs, and POS code reading error occurs. There is no risk of easiness or broken lines, there is no increase in the number of times of printing, the process and cost are favorable, drying failure hardly occurs, black ink with good adhesion of ink and printed matter using this black ink It is to provide.

  In order to solve this problem, the present invention provides a black ink in which the ink other than black is mixed in an amount of 2 or more and 200 or less with respect to 1000 by weight ratio in weight ratio in claim 1 It is.

  According to the second aspect of the invention, the ink other than the black ink is composed of 30 to 70 ink, 30 to 70 red ink, and 10 to 30 yellow ink at a weight ratio of the base ink, the red ink and the yellow ink. An ink according to item 1 is provided.

  According to the third aspect of the present invention, the black ink according to the second aspect is provided, wherein the black ink, the black ink, the red ink, and the yellow ink are respectively process inks for offset printing.

  According to the fourth aspect of the present invention, the black ink according to the third aspect is provided, wherein the black ink, the black ink, the red ink, and the yellow ink are respectively ultraviolet ray curing type offset printing process inks.

  A fifth aspect of the present invention provides a printed material printed using the black ink according to any one of the first to fourth aspects.

  A sixth aspect of the present invention provides a black ink according to the fifth aspect of the present invention, and a printed material printed using a black ink, a red ink, and a yellow ink.

  A seventh aspect of the present invention is to provide the printed matter according to the sixth aspect, wherein the printed matter is a paper container.

  In order to solve this problem, according to the present invention, even in the case of an ink having a four-color constitution of black ink, black ink, red ink and yellow ink, the black density is increased and the white characters are crushed. There is no risk of occurrence of POS code reading error or broken lines, no increase in the number of printings, preferable in terms of process and cost, less drying failure, ink adhesion It is possible to provide a good black ink and a printed material using the black ink.

  Further, according to the second aspect of the present invention, the color does not occur or the color does not deviate from the black color.

  In the third aspect, since the color quality is stable, the optimum ink composition can be determined without trial and error.

  According to the fourth aspect of the present invention, quick drying can be achieved by ultraviolet irradiation, and it is possible to provide black ink printing with high black density which is less likely to cause color mixing.

  According to the fifth aspect of the present invention, since the black density of the black ink is increased, the amount of ink buildup can be suppressed, and the suppression of the collapse of the white character, the prevention of the reading error of the POS code, the prevention of the ruled line breakage Since it is possible to realize a high black density by one-time black printing, it is preferable in terms of process and cost, and it is difficult to cause a drying defect because it is not necessary to draw a net with black ink or red ink in the black part. Good adhesion can be achieved.

  According to the sixth aspect of the present invention, the range of color reproducibility is broadened, and high-quality printed products can be provided.

  According to the seventh aspect of the present invention, it is possible to provide a printed material which is a paper container in which the creases are suppressed at the time of assembling the paper container.

  In terms of weight ratio, black ink is prepared by mixing the amount of ink other than black with the amount of 2 to 200 with respect to 1000 of process black ink. In this case, the kneading of the ink was performed using a triple roll.

  When the weight ratio is less than 2 for the process black ink and 1000 for the non-black ink, the difference from the pure black ink is not clear, and if it exceeds 200, the black density decreases in reverse. Preferably, 100 or more and 150 or less are good.

  In addition, it is preferable that the ink other than the black ink be a black ink comprising 30 to 70, a red ink 30 to 70, and a yellow ink 10 to 30 in terms of a weight ratio of an amber ink to a red ink to a yellow ink. If the indigo ink is less than 30 or 70, the red ink is less than 30 or 70, or the yellow ink is less than 10 or more than 30, then a tint occurs and it deviates from the black color. Particularly preferably, the weight ratio of the base ink, the red ink and the yellow ink is 40 to 60, the red ink 40 to 60, and the yellow ink 15 to 25.

  In addition, although it is preferable that each of the black ink, the black ink, the red ink, and the yellow ink is a process ink for offset printing, it may be an ink for gravure printing or another ink. Since the color quality is stable when each is a process ink for offset printing, an optimum ink composition can be determined without trial and error. Of course, even if it is not a pure process ink for offset printing, a color similar to the color of the process ink for offset printing can be obtained because similar effects can be obtained, but inks other than other process inks are preferable. And even if it is well balanced with other colors of ink, it has a reasonable effect.

  In addition, it is preferable that each of the black ink, the black ink, the red ink and the yellow ink is a process ink for ultraviolet curing type offset printing. When the process ink for offset printing is an ultraviolet ray curing type, it can be made quick-drying by ultraviolet irradiation, and it is possible to provide a black ink print with high black density which is less likely to cause color mixing.

  Offset printing is applied to paper or the like using this black ink to obtain a printed matter. Such a print can increase the black density of the black ink, which can reduce the amount of ink buildup, and can suppress collapse of white characters, prevent POS code reading errors, and prevent broken lines, High black density can be realized by black ink printing, which is preferable both in terms of process and cost, and since it is not necessary to draw a net with black ink or red ink in the black part, drying failure hardly occurs and adhesion of the ink is good Print can be provided.

  Moreover, it is preferable to set it as the printed matter printed using black ink, and rouge ink, red ink, and yellow ink. Such a print can expand the range of color reproducibility, and can provide a high quality print. The screen angle in this case is preferably 45 degrees black, 15 degrees red, 75 degrees red, and 30 degrees yellow, but may be appropriately adjusted depending on the target print or pattern.

  The printed matter may be a film or the like, but a paper container is particularly effective. The printed material which is such a paper container can provide a paper container with reduced creases at the time of assembling the paper container.

  Below, the Example of this invention is described. However, the present invention is not limited to the matters described below.

Example 1
Black ink, black ink, red ink and yellow ink were prepared for FD Carton X (UV offset ink manufactured by Toyo Ink Co., Ltd.). Then, the composition ratio is weight ratio and is kneaded using three rolls so that the black ink is 50, the red ink is 50, and the yellow ink is 20 with respect to 1000 for the black ink, and a special ink is prepared. The solid printing was performed on the offset printing paper container paper using such special black ink.

Comparative Example 1
FD Carton X (UV offset ink manufactured by Toyo Ink Co., Ltd.) ink was prepared. Solid printing was performed on offset printing paper container paper using such process black ink.

(Measurement result)
Five points per Example 1 and Comparative Example 1 were measured with a reflection densitometer Denshiai 100 (X-Rite: product name). The 5-point average concentration of Example 1 was 1.73. On the other hand, the 5-point average density of Comparative Example 1 was 1.65.

  From this, it was found that mixing black ink with a small amount of another color ink had a higher density than pure black ink.

Claims (7)

  Black ink obtained by mixing process non-ink ink in an amount of 2 or more and 200 or less with respect to 1000 by process black ink in weight ratio.   2. The black ink according to claim 1, wherein the ink other than the black ink comprises a ratio of 30 to 70 of red ink, 30 to 70 of red ink, and 10 to 30 of yellow ink in a weight ratio of an amber ink to a red ink to yellow ink. .   The black ink according to claim 2, wherein the black ink, the black ink, the red ink, and the yellow ink are each process ink for offset printing.   The black ink according to claim 3, wherein each of the black ink, the black ink, the red ink, and the yellow ink is an ultraviolet curable offset printing process ink.   A printed material printed using the black ink according to any one of claims 1 to 4.   A printed material printed using the black ink according to claim 5, and a twill ink, a red ink, and a yellow ink.   The printed matter according to claim 6, wherein the printed matter is a paper container.