JP2016132097A - Manufacturing method of color printing corrugated cardboard sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the printing accuracy of each corrugated cardboard sheet by utilizing a preprinting system for white background printing while suppressing a cost load for color printing at a small lot.SOLUTION: The manufacturing method includes, at a first stage plant 11, the preprinting step of forming a white preprint layer 2 on one surface of a liner sheet 1 used for a front liner by a flexographic press, and the drying step of drying a white front liner 3 having the preprint layer 2 formed therein, and at a plurality of second stage plants 21 different from the first stage plant 11 to which the white front liner 3 has been distributed, the sticking step of manufacturing a corrugated cardboard sheet 6 by using the white front liner 3, and the color printing step of executing color printing on the white front liner 3 of the corrugated cardboard sheet 6 at the second stage plant 21, the steps being sequentially carried out.SELECTED DRAWING: Figure 1

Description

  The present invention relates to color printing on cardboard.

  A beautiful color printing is applied to the surface of a cardboard box that wraps a product, and the product is placed in a store in a state of being accommodated in the box, and the printed cardboard box itself is used for a consumer display. However, the printing contents of individual cardboard boxes may vary finely for each production factory or lot, and sheets are often printed in relatively small lots of hundreds to thousands.

  By the way, a liner used in a normal corrugated cardboard sheet is a brown brown liner, and even if color printing is directly performed on the liner, the color of the ground may be seen through, and it is difficult to finish it beautifully. For this reason, when emphasizing cosmetics, a technique has been adopted in which a white liner with good ink coloring is used as a front liner. However, the white liners that are produced are limited in basis weight and paper width, and the degree of freedom in handling is low. In view of this, a method has been used in which a white background is formed by printing in advance on the entire surface of a sheet on which a normal brown liner is bonded using a sheet direct printing machine, and then color printing is performed thereon.

  However, when trying to form a white background with a sheet direct printing machine, the area for printing white ink is large, and the interval from white coating to color ink coating is short, so drying defects and bleeding are likely to occur, and cosmetic properties are improved. It is easy to lose. Further, since white is printed on the entire surface of the cardboard sheet, printing pressure is applied over a wide range, and the sheet strength is likely to deteriorate.

  On the other hand, after pre-printing on the front liner base paper before being bonded to the center core, a white background is formed before the corrugated cardboard sheet is formed by adopting a pre-printing method to be bonded to the center core and the back liner. A technique has been proposed (Patent Document 1).

  Since this pre-printing is printing on the entire surface of the sheet, it is desirable in terms of cost to use a high-speed printer as much as possible from the viewpoint of the work process (Patent Document 2 [0010]).

Japanese Patent No. 3895174 JP 2002-96817 A

  However, printing on the front liner by the preprint printing method is printing in a roll-to-roll method, and printing is performed in roll units. For this reason, it will not be possible to inquire in terms of cost unless a large amount of printing is performed on a corrugated cardboard sheet for about 10,000 units at a time.

  Further, if a printing machine that is as fast as possible is not used for printing in large quantities, it takes too much time for printing, and the merit of preprinting a white background decreases as the speed decreases. However, it is not realistic to install high-speed printers that do not meet demand in individual factories. For this reason, it has been difficult for cardboard sheet factories for products, which are often diversified and printed in small lots, to benefit from preprinting.

  Accordingly, an object of the present invention is to improve the printing accuracy of individual corrugated cardboard sheets by using a pre-printing method for printing on a white background while suppressing the cost burden for color printing in a small lot.

This invention
A pre-printing step of forming a white pre-printing layer on a surface side of a portion corresponding to at least one surface of a liner paper used for a front liner at a first-stage factory by a flexo printing machine;
A drying step of drying the white surface liner provided with the preprint layer;
In a plurality of second-stage factories that are different from the first-stage factory that distributes the white-surface liner, a bonding process for producing a cardboard sheet using the white-surface liner,
In the second stage factory, a color printing process for performing color printing on the white surface liner of the cardboard sheet;
The above-mentioned problems have been solved by a method for producing a color printed corrugated cardboard sheet which is sequentially performed.

Here, the flexographic printing machine that forms the preprint layer in the first stage factory is preferably a high-speed printing machine capable of sufficiently printing at a high speed. This high-speed printer is a printer having a maximum printing speed of 500 m ² / min or more when printing on the entire surface. After a white background is preprinted on a liner such as a tea liner in a first stage factory equipped with a high-speed printing machine, a white surface liner that has already been formed is distributed to the second stage factory that performs each color printing. Since the time required for transporting this distribution is the same as the above drying process, even if a base is formed on the entire surface by pre-printing, it is possible to suppress the occurrence of poor drying and bleeding, and as a result, cosmetics in the finish after color printing. It becomes easy to secure. In addition, since transportation is performed in the state of a front liner and bonding is performed at the second stage factory, even if a large number of sheets are stacked, there are fewer voids than corrugated cardboard sheets, and the volume occupied during transportation is reduced. Effort and cost can be reduced. The second-stage factory that performs individual color printing with different contents for each lot on the cardboard sheets that have been bonded together is a white with a pre-printed base even without the high-speed printing machine. By supplying the front liner, color printing excellent in cosmetics can be performed.

  With this invention, pre-printing is possible for orders in which color printing in small lots is performed in several printing factories for cardboard in cases where there is no ready-made white liner for basis weight or paper width. Thanks to the high-speed and stable white background formation, color printing that ensures cosmetics at individual printing factories is possible.

Example flow chart for carrying out the present invention Cross section of tea liner before coating Cross section of white surface liner with preprint layer laminated to brown liner Cross-sectional view of corrugated cardboard sheet with white surface liner Cross section of color printed cardboard sheet color printed on cardboard sheet

  Hereinafter, the present invention will be described in detail with reference to embodiments. The present invention relates to a method for producing a corrugated cardboard sheet that performs color printing on the corrugated cardboard sheet.

  FIG. 1 shows a conceptual diagram of the manufacturing method according to the present invention. In this manufacturing method, each process is performed in a first stage factory 11 having at least a high-speed printing machine and a plurality of second stage factories 21 existing at least at a site away from the first stage factory 11. Further, after printing on the corrugated cardboard sheet, the corrugated cardboard sheet is boxed and shipped to a third stage factory 31 where the product is separately packaged.

The high-speed printing machine provided in the first stage factory 11 refers to a flexographic printing machine having a printing capacity of at least 350 m ² / min or more with respect to the liner paper used for the front liner in the present invention, and 400 m ² / min or more. It is preferable to have printing ability. In particular, it is preferable that the above speed can be realized even during full-surface printing. The high-speed printing press forms a preprint layer that becomes a white surface liner with a white background used for color printing of corrugated cardboard sheets, but the scale merit concentrated in the first-stage factory cannot be fully utilized unless it is fast enough. It is.

  On the other hand, there are a plurality of the second-stage factories 21a, 21b, 21c,... Implementation of the manufacturing method according to the present invention can be configured by distributing and using the white surface liner manufactured by the high-speed printing machine of the first stage factory. In particular, a factory not equipped with the high-speed printing machine has a greater merit for configuring the production method according to the present invention. This is because it becomes possible to share the capability of a high-performance high-speed printing press that is difficult to introduce in all individual factories due to cost, site, and other reasons.

  The process which comprises a manufacturing method is demonstrated in order along the flowchart of FIG. First, liner paper used for the front liner constituting the corrugated cardboard sheet is prepared (S01). Here, an example using the normal tea liner 1 shown in FIG. 2 is shown. The tea liner 1 used in the present invention has the advantages of the present invention when it is used for those in which a ready-made white liner does not exist or is difficult to obtain in terms of basis weight, paper width, paper thickness, paper quality and the like. You can enjoy it to the fullest. This is because a standard having a white liner may be used.

  In the pre-printing step (S02), the white surface print liner 3 is obtained by laminating the white pre-print layer 2 on the surface of the brown liner 1 as shown in FIG. Here, the preprint layer 2 is applied to the tea liner 1 on the surface side of the portion corresponding to at least one surface when the cardboard box is formed, and at least a partial region of the surface is coated without a gap. preferable. Here, the partial area is an area that can be exposed as a printing surface of the cardboard box, such as an upper surface in the case of a cardboard box used in a wrap round method and an area corresponding to a side surface in the case of an A type box. When color printing is performed on the entire cardboard box, it may be applied to the entire surface of one surface of the brown liner 1. This is because the preprint layer 2 serves as a base for color printing to be applied at a later stage, and therefore needs to cover at least the entire portion to be subjected to color printing.

In this preprinting step, it is preferable to form an anchor coating agent layer (not shown) by applying an anchor coating agent with a flexographic printing machine as a preliminary step for applying the preprinting layer 2 with white ink. An anchor coating agent is a liquid that contains at least one of, for example, calcium carbonate, kaolin, and talc. By coating on the surface of the liner, the surface is smoothed, and the color development of white ink and color ink Is to improve. The coating amount of the anchor coating agent is preferable to be 1 g / ^{m 2} or more, and more preferably 2 g / ^{m 2} or more. This is because if the amount is too small, the effect of improving the color developability due to the application of the anchor coating agent is not sufficiently exhibited. On the other hand, preferable to be 10 g / ^{m 2} or less, more preferably 8 g / ^{m 2} or less. This is because if the amount is too large, the color developability of the white ink is not excessively improved and is wasted. Incidentally, flexographic printing machine used in the coating of the anchor coating agent refers to flexographic printing machine having at least 500 meters 2 ^/ min or more printing capability, preferably with a 600 meters 2 ^/ min or more printing capability.

In this pre-printing process, regardless of the presence or absence of the anchor coat agent layer, white ink is applied to one surface of the tea liner 1 (the surface of the anchor coat agent layer if any). A preprint layer 2 is formed to obtain a white surface liner 3. Here, a normal white ink containing a white pigment can be used as the white ink. The coating amount of the white ink, preferable to be 1 g / ^{m 2} or more, and more preferably 2 g / ^{m 2} or more. More preferably, it is 4 g / m ² or more. If it is less than 1 g / m ² , the concealability by the white ink is insufficient, and the brown color that is the original color of the tea liner 1 that is the base material can be seen through, and color printing can be performed by forming a white background in advance. The effect of improving cosmetics will be impaired. On the other hand, preferable to be 10 g / ^{m 2} or less, more preferably 8 g / ^{m 2} or less. More preferably, it is 6 g / m ² or less. This is because 10 g / m ² is sufficient for concealing the formation, and if it is too much, a particularly suitable effect cannot be obtained and is wasted.

  The white ink used here contains a white pigment such as titanium oxide, and preferably has a high hiding property, and preferably contains titanium oxide. For this reason, only the calcium carbonate used for the anchor coating agent is insufficient in hiding property as the white ink used here and is difficult to use.

In the high-speed printer used when laminating the preprint layer 2, the printing speed is preferably 350 m ² / s or more, and more preferably 400 m ² / s or more. Since printing in a plurality of second-stage factories 21a, 21b, and 21c, which will be described later, is collectively printed in one first-stage factory 11, it is preferable to print as much white surface liner 3 as possible at high speed. It is. In addition, although there is no problem in particular for a quick part, about 700 m < ² > / s becomes a limit at the time of this-application application. Of course, it would be desirable if the available printing machine would be faster.

  The white surface liner 3 on which the preprint layer 2 is formed is distributed and transported from the first stage factory 11 to a plurality of second stage factories 21a, 21b, and 21c. At this time, if it is transported in a state of being wound on a roll, it can be used as it is in the production of corrugated cardboard sheets in the second stage factories 21a, 21b, 21c. The time required for the packaging process for transportation and the transportation time are drying steps for drying and stabilizing the preprint layer 2 of the white surface liner 3 (S03). By sandwiching this drying step, it is possible to sufficiently suppress the preprint layer 2 from being stably fixed and causing bleeding or the like in color printing performed thereafter.

  As the drying step (S03), when a drying time of 8 hours or more is secured between the formation of the preprint layer 2 and the subsequent bonding step (S04) and the color printing step (S05). Preferably, it is more preferable to secure 24 hours or more. As described above, this time includes the distribution transportation time. In addition, there is no particular problem with the amount stored in the warehouse after transportation, and the upper limit of the time of the drying step (S03) is not particularly defined, but is desirably 30 days or less in terms of management.

  In the second stage factory 21 (21a, 21b, 21c...), The bonding process (S04), the color printing process (S05), and the punching process (S06) are sequentially performed.

  First, the white front liner 3 distributed and transported from the first stage factory 11 is used as a front liner, and is bonded to the core 4 and the back liner 5 to produce the corrugated sheet 6 shown in FIG. 4 (S04). I do. A general corrugator may be used for the bonding process. In addition, when manufacturing a double-sided corrugated cardboard sheet and a double-sided corrugated cardboard sheet, the present invention may be carried out by using the above-mentioned white surface liner 3 as a front liner. .

  Next, as shown in FIG. 5, a color printing step (S05) is performed on the white surface liner 3 of the corrugated cardboard sheet 6 using one or more types of inks other than white to perform color printing with a flexographic printing machine. Do. Since the color printing corrugated cardboard sheet 8 on which the color printing layer 7 is laminated has undergone the drying step (S03), the white surface liner 3 is sufficiently dried, and the color ink applied on the surface thereof. Prints with vivid colors without bleeding, and exhibits high cosmetic properties.

  Through the steps so far, a color printed cardboard sheet 8 on which a vivid color printing is performed on a white background can be manufactured. Even if the second-stage factory 21 is not equipped with a high-speed printing machine or is equipped with a high-speed printing machine, even if it is difficult to use due to the number of lots, it is possible to enjoy the benefits of pre-printing with a high-speed printing machine and efficiently perform color printing Sheet 8 can be manufactured. This benefit is that a preprint layer 2 having a bright white background is laminated by preprinting before being bonded to the corrugated cardboard sheet 6, so that most or all of the surface of the corrugated cardboard forms the preprint layer 2. It is possible to avoid problems such as deformation due to the pressure at the time or color unevenness due to steps.

  The manufactured color printed cardboard sheet 8 is then subjected to a punching process (S06) in which it is punched with a mold according to the application so that it can be used as a box. This can be done by the same procedure as in normal punching. The punched sheet that has been punched is shipped to the third stage factory 31 that is a factory for the user who uses the sheet as a box (S07). Note that a plurality of third stage factories 31 may exist for one second stage factory 21a (31b, 31c...).

  In the third stage factory 31, the punched sheet is assembled as a box, and the packaged material is packaged and used (S08). The punched sheet produced by the above process is sufficiently printed with color on a white background, so that it can be sufficiently used as a store display even if it is packaged in cardboard. Examples of packages to be used for such purposes include canned beverages, PET bottle beverages, bottled beverages, cup noodles, seasonings, detergents, shampoos, fragrances, and deodorants. Among these, it is preferable to use a wraparound method in which a cardboard box is produced while being packaged.

  Finally, the product packaged in the boxed color printing cardboard box is shipped (S09). At the store of the shipping destination, the color printing layer printed on the white background can appeal the contents of the packaged product to the customer with vivid colors, which can contribute to customer attraction.

The Example which implemented this invention concretely is shown.
First, the materials used will be described.
・ Anchor coating agent (manufactured by Sakata Inx Co., Ltd .: Anchor No. 1, containing calcium carbonate)
・ White ink (New FK White, manufactured by Sakata Inx Corporation)
・ Tea liner (Rengo Co., Ltd .: ETSE120)
・ Core (Rengo Co., Ltd .: KS120)
・ Color ink (manufactured by Sakata Inx Co., Ltd .: New FK, Grass, Indigo, Crimson, Black)

Next, evaluation criteria are shown.
<Concealment><Color development in post-printing><Breaking in post-printing><Color unevenness due to steps>
Relative evaluation was made visually with reference to the product in Example 1.
<Dryness during color ink printing (post printing)>
Relative evaluation was performed by a sensory test by direct contact with the product in Example 1 as a reference.
<Whiteness>
Measured with a whiteness measuring device Color Tester MODEL SC-3 manufactured by Suga Test Instruments Co., Ltd.

Example 1
In the printing factory that is the first stage factory, white ink is applied to the entire surface of one side of the tea liner using a flexographic printing machine (unit type flexographic printing machine RG9205FU-STS printing speed: 500 m ² / min manufactured by Neurong Co., Ltd.). The coating was carried out so as to be 0.0 g / m ² . When the whiteness was evaluated, it was 60, and the evaluation of the concealability was ○. After coating, it was transported to the second stage factory, and a two-day drying process was provided until the double-sided cardboard was bonded.

  In the printing factory, which is the second stage factory, a double-faced cardboard was made by pasting the white core liner after coating and pasting the core and the brown liner together. Color printing was performed on the double-sided cardboard using a flexographic printing machine (Minelva 3 colors 100 manufactured by Hamada Printing Machinery Co., Ltd.). This color development was sufficiently high, and almost no bleeding was observed. Further, no color unevenness due to the steps was observed, and the drying property was sufficiently secured. These results are shown in Table 1.

(Reference Example 1)
In Example 1, after the white ink was applied to the tea liner, color printing was performed on the tea liner before completing the drying of the white ink without transporting to the second stage factory. Although the time required for subsequent drying became longer, color unevenness due to the step was not seen at all. The color developability after color printing was slightly lower than that of Example 1, but the color developability was good and almost no bleeding was observed. However, it was decided to produce more than the number of lots required at the first stage factory.
For this example and Comparative Examples 1 and 2 described later, the time required for drying after color printing is described as the time required for drying.

(Example 2)
In Example 1, the anchor coating agent was printed on the entire surface of one surface of the tea liner with a flexographic printing machine (500 m ² / min) so that the amount of the anchor coating agent was 2.0 g / m ² before applying the white ink. . From this anchor coating agent layer, white ink was applied in the same manner as in Example 1, and then a double-faced cardboard was obtained by the same procedure. The evaluation results are shown in Table 1. In particular, in terms of concealment, the results were superior to those of Example 1, and the other results were also good.

Example 3
In Example 2, the coating amount of white ink was decreased from 8.0 g / m ² to 5.3 g / m ² . While sufficiently concealing, the time required for the drying process could be shortened, and a good printing result without blurring was obtained.

Example 4
In Example 2, the amount of white ink applied was reduced from 8.0 g / m ² to 4.4 g / m ² . Although the concealability and color developability were slightly lowered, the time required for the drying process could be shortened, and a good printing result without blurring was obtained.

(Example 5)
In Example 2, the coating amount of white ink was decreased from 8.0 g / m ² to 2.1 g / m ² . Although the concealability and color developability were slightly lowered, the time required for the drying process could be shortened, and a good printing result without blurring was obtained.

(Example 6)
In Example 1, the coating amount of white ink was decreased from 8.0 g / m ² to 2.1 g / m ² . Although the concealability and color developability were slightly lowered, the bleeding was suppressed in the same manner as in Example 1 and remained within a practical range, and the time required for the drying step could be shortened.

(Example 7)
In Example 2, the amount of the anchor coating agent was halved, and the amount of white ink applied was reduced from 8.0 g / m ² to 1.0 g / m ² . Although the concealability and color developability were slightly lowered and slight blurring was observed, it remained within the range where practical results were obtained, and the time required for the drying process could be shortened.

(Comparative Example 1)
In Example 1, the white ink was not preprinted in the first stage factory, but was brought into the second stage factory from the beginning, and the cardboard sheets were bonded together, and then directly printed on the sheet. Immediately after that, when color printing was performed, the color developability was slightly inferior, and the blur occurred greatly. In addition, drying after color printing was insufficient, resulting in stickiness.

(Comparative Example 2)
In Comparative Example 1, when the white ink was reduced to 2.1 g / m ² , both the color development property and the hiding property became insufficient.

DESCRIPTION OF SYMBOLS 1 Brown liner 2 Preprint layer 3 White surface liner 4 Core 5 Back liner 6 Corrugated cardboard sheet 7 Color printing layer 8 Color printing corrugated cardboard sheet 11 First stage factory 21,21a, 21b, 21c Second stage factory 31 Third stage factory

Claims (3)

A pre-printing step of forming a white pre-printing layer on a surface side of a portion corresponding to at least one surface of a liner paper used for a front liner at a first-stage factory by a flexo printing machine;
A drying step of drying the white surface liner provided with the preprint layer;
In a plurality of second-stage factories that are different from the first-stage factory that distributes the white-surface liner, a bonding process for producing a cardboard sheet using the white-surface liner,
In the second stage factory, a color printing process for performing color printing on the white surface liner of the cardboard sheet;
A method for producing a color printed cardboard sheet, which is sequentially performed. After the color printing process,
In the second stage factory, a punching process for punching the color printed cardboard sheet is performed.
The method for producing a corrugated cardboard sheet according to claim 1. In the method for producing a corrugated cardboard sheet according to claim 2, after the punching step,
A method for producing a corrugated cardboard box, wherein a third step factory carries out a box making process of making a box using the corrugated cardboard sheet while packaging an article to be wrapped by a wraparound method.

Images