JP2018176517A - Decorative paper, decorative plate using the same and manufacturing method of decorative plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide decorative paper that can be practically used, taking advantage of characteristics of an inkjet printing system while solving problems in inkjet-printed decorative paper, and a decorative plate using the same.SOLUTION: Decorative paper has a pattern 2 printed by an inkjet printing system on a surface of decorative plate base paper 5. The decorative plate base paper has an ink reception layer 3 on a surface thereof, with an ash content of 25 wt.% or less. When a melamine resin decorative plate 10 is produced through getting printed with 100% image density of cyan ink, laminated with overlay paper 6 impregnated with a melamine-formaldehyde resin and pressed with hot pressing work, a reflection density of the cyan ink is 1.3 or more.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a decorative paper, a decorative board, and a method of manufacturing the decorative board, and more particularly to a decorative paper on which a design is printed by an inkjet printing method, a decorative board manufactured using the decorative paper, and a method of manufacturing the same.

  After impregnating a thermosetting resin solution such as melamine formaldehyde resin or diallyl phthalate resin on decorative paper in which patterns such as wood grain patterns and abstract patterns are printed on base paper for decorative paper, it is dried at a temperature at which the resin does not completely cure. A thermosetting resin decorative board is manufactured by making it, superimposing this prepreg on a base material such as core paper, and hot pressing.

  As these decorative boards, a high pressure melamine resin decorative board, a low pressure melamine resin decorative board, a diallyl phthalate resin decorative board, a benzoguanamine resin decorative board, etc. are known. As a decorative paper used for these thermosetting resin decorative boards, a titanium paper into which a large amount of titanium dioxide is scooped at the paper making stage is used as a base paper. A decorative paper on which various patterns are printed by a gravure printing method is generally used as a decorative paper for thermosetting resin decorative plates, using titanium paper as a decorative board base paper.

  These decorative papers are required to have various performances such as resin impregnating ability, hiding ability, processing aptitude when processed into a decorative plate, various physical properties after becoming a decorative plate, as well as design characteristics. Ru. However, there is a contradiction in each of these performances, and it is required to provide them in a well-balanced manner at a high level.

  As titanium paper, it is common to use colored titanium paper colored in a predetermined color tone in advance according to the target pattern, and as the print pattern, resin impregnation is carried out by printing only patterns without solid printing. And physical properties (physical properties) of the decorative plate are secured. This is because when the ink deposition amount is too large, the physical properties such as heat resistance of the decorative board may be reduced.

  Although the gravure printing method is suitable for efficiently producing a large amount of decorative paper, it is unsuitable for the production of small lots because of the high plate making cost. Therefore, in recent years, a production method that can cope with small lot production using an inkjet printing method is being studied.

  The inkjet printing method can be produced even from only one piece of decorative paper, and the reproducibility and definition of the pattern are satisfactory, but basically it is the sheet-fed printing method or the printing base paper of the winding is Even if it can be used, it is general that printouts having a length of only several tens of meters at most can be obtained.

  On the other hand, since the step of impregnating the thermosetting resin to make a prepreg is generally performed by a continuous impregnation device equipped with a long drying oven, it is possible to make a sheet of paper or a short length of decorative paper Could not respond to

  In the ink jet printing method, a dedicated printing paper having a receptive layer formed on the surface in advance is used, and the ink drops are colored only when the ink drops are deposited on the receptive layer, and are conventionally used for gravure printing. Even if ink jet printing is simply performed on colored titanium paper, the original color can not be obtained.

  In addition, an ink receiving layer is formed on the surface of a conventional colored titanium paper, and ink jet printing is performed, and even if it is attempted to impregnate a thermosetting resin thereafter, the ink receiving layer interferes and the resin impregnating property is deteriorated and uniform. Can not be obtained.

  Therefore, it is conceivable to print in solid color by inkjet printing method on ink jet printing paper on which a receptive layer has been formed in advance, but in this case solid printing is not stable, and streaks, color unevenness and color dispersion tend to occur. I understood.

  The press-processable decorative paper-impregnated body that can be printed by the ink jet method described in Patent Document 1 is made for the purpose of solving the above-mentioned problems, and the decorative board is impregnated with a thermosetting resin in advance. After forming a prepreg, a receiving layer is formed on the surface to make it possible to perform inkjet printing.

  Although the decorative paper impregnated body described in Patent Document 1 solves the above-mentioned problems in the inkjet printing method, the thermosetting resin impregnated prepreg has a lifetime of from impregnation and drying to pressing. There is a restriction on For this reason, there is a basic problem that the characteristic of the ink jet printing method that small lot correspondence is possible can not be utilized because it can not be prepared in large quantities and used for dispensing.

  In the decorative sheet and the decorative board described in Patent Document 2, a pattern having a very sharp outline, such as inlaid patterns, can not be handled by the conventional gravure printing method, and the base grain pattern by gravure printing can not be used. In addition to the above, an inlaid pattern by an ink jet printing method is overlapped to realize a sharp inlaid textured grain decorative sheet.

  In Patent Document 2, the cellulose resin ink layer used for the base wood grain pattern by gravure printing functions as a receiving layer in ink jet printing, but since the ink layer in the base wood grain printing layer is not a uniform layer, the ink jet printing is performed. The receptive layer in the above is not always satisfactory, and there is a problem that the coloration tends to occur.

  Further, in Patent Document 2, there is no question at all considering the actual production, including various problems in the above-mentioned resin impregnation step, so there is a question on practicality.

JP 2011-508682 gazette JP 2001-71446 A

  The problem to be solved by the present invention is to solve the above-mentioned problems in the ink jet printing decorative paper, and to propose a practical decorative paper utilizing the characteristics of the ink jet printing system and a decorative board using the same.

  As means for solving the above-mentioned problems, the invention according to claim 1 is a decorative paper in which a pattern by an inkjet printing method is printed on the surface of a decorative board base paper, and the decorative board base paper receives ink on the surface Layer, printing with an ash content of 25% by weight or less, and an image density of cyan ink of 100%, followed by overlaying with a melamine formaldehyde resin impregnated overlay paper and hot press forming to create a melamine resin decorative board And the reflection density of the cyan ink is 1.3 or more.

  The decorative paper according to the present invention is not premised to be impregnated with a thermosetting resin after printing, and is not provided with a solid colored layer corresponding to conventional colored titanium paper, and is dedicated to design printing only by design. It is intended to make the most of the features of the printing method.

The invention according to claim 2 is the decorative paper according to claim 1, wherein the ink discharge amount (Wet) in the inkjet printing is 5 g / m ² or more and 15 g / m ² or less. .

  In addition, the invention according to claim 3 has a decorative board base material, a colored titanium paper impregnated with melamine formaldehyde resin, the decorative paper according to claim 1 or 2, and a melamine formaldehyde resin impregnated overlay paper in this order. It is a decorative board to be characterized.

  In the invention according to claim 4, the decorative paper according to claim 1 or 2 is placed on a colored titanium paper impregnated with a melamine formaldehyde resin, and a melamine formaldehyde resin impregnated overlay is placed on the decorative paper. A method of manufacturing a decorative board characterized in that the paper is placed and subjected to a hot-pressing process together with the decorative board base material for integration.

  The decorative sheet base paper used for the decorative paper according to the present invention has an ink receiving layer on the surface, and thus is excellent in inkjet printability. Further, by setting the ash content to 25% by weight or less, the hiding property is suppressed, and by using colored titanium paper as the base, the color tone of the base can be sufficiently utilized, and there is no problem in design. Regarding printability, the image density of the cyan ink is 100% printed, and then overlaid with the melamine formaldehyde resin-impregnated overlay paper and subjected to hot-pressing to form a melamine resin decorative board, and the reflection density of the cyan ink The image reproducibility is guaranteed by having the value of 1.3 or more.

  The decorative paper according to the present invention presupposes that resin impregnation is not performed in post-processing, and by specializing in design printing, various problems in the ink jet printing system, that is, instability of solid printing, impregnation unevenness, impregnation, While solving problems such as process difficulties, it has become possible to maximize the small-lot printing capability, which is an advantage of the inkjet printing method.

As in the invention according to claim 2, when the ink discharge amount (Wet) in the ink jet printing is 5 g / m ² or more and 15 g / m ² or less, the density and reproducibility of the pattern are good, In addition, stable printing is possible.

  The melamine resin decorative board according to claim 3, which is produced by the production method according to claim 4, is not impregnated with resin on the decorative paper but integrated with the melamine resin contained in the underlying colored titanium paper and the overlay paper. The decorative board is obtained by For this reason, the problem of the resin impregnation process in the decorative paper by an inkjet printing system is avoided, and the feature of the inkjet printing system can be fully utilized.

FIG. 1 is a cross-sectional explanatory view showing the layer structure of the decorative paper according to the present invention. FIG. 2 is a cross-sectional explanatory view showing a layer configuration in an embodiment of a decorative board made using the decorative paper shown in FIG.

Hereinafter, a decorative paper according to the present invention and a decorative board using the same will be described with reference to the drawings. FIG. 1 is a cross-sectional explanatory view showing the layer structure of the decorative paper 1 according to the present invention. The decorative paper 1 according to the present invention is a decorative paper in which the design layer 2 is printed on the surface of the decorative base material 5 by the inkjet printing method.
The decorative board base paper 5 is obtained by forming the ink receiving layer 3 on the surface of the base paper 4, and is characterized in that the total ash content including the ink receiving layer is 25% by weight or less. The fact that the ash content of the decorative base material 5 is 25% by weight or less means that the ash content is smaller compared to titanium paper usually used for decorative panels, and therefore the concealability is inferior while the light transmission is increased. It means that it is possible to use the color of the base when colored titanium paper is laid on it.

  If the ash content exceeds 25%, the hiding power is too strong, and even if colored titanium paper is laid on the base, the color tone may not be able to be utilized, which is not preferable.

  As the ink receiving layer, known receiving layers can be used. As an example, one in which a filler, a pigment, a fixing agent, an auxiliary agent and the like are dispersed in a hydrophilic coating agent containing a water-soluble polymer or a water-dispersible polymer as a binder is used.

  As a pigment used for the ink receiving layer, aluminum oxide, aluminum hydroxide, boehmite, silica or the like can be used.

  As the binder, polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl acetate, starch, gelatin, carboxymethyl cellulose, ethylene / vinyl acetate copolymer, styrene / acrylic ester copolymer, or a mixture thereof can be used.

  As a standard for judging the printability of the decorative board base paper 5, the image density of the cyan ink is 100% printed, and then it is superposed on the melamine formaldehyde resin impregnated overlay paper and heat pressure pressed to create a melamine resin decorative board It is one of the criteria that the reflection density of cyan ink at the time of printing is 1.3 or more.

  The reason why the image density of cyan ink is used as a reference is that the stability of the ink is high and the printing and coloring are stable. Under conditions such that the cyan ink stably develops color, it is expected that other yellow, magenta, black, etc. inks will also generate appropriate color.

As in the invention according to claim 2, when the ink discharge amount (Wet) in inkjet printing is 5 g / m ² or more, there is practically no problem in the reproducibility of the pattern. If it is less than 5 g, the reflection density may be insufficient, and the reproducibility of the pattern may not be sufficient.

On the other hand, when the ink discharge amount exceeds 15 g / m ² , paper wrinkles are likely to occur during printing, and stable printing may not be possible. In addition, as a result of the deterioration of the melamine processing suitability, the decorative board may be swollen.

  As shown in FIG. 2, the decorative paper 1 according to the present invention is placed on the colored titanium paper 7 impregnated with the melamine formaldehyde resin, and further the melamine formaldehyde resin impregnated overlay paper 6 is placed thereon. It can be used as a melamine decorative board by performing a hot-pressing process with the base material 8 and integrating.

In the case of a high-pressure melamine resin decorative board, a plurality of core papers impregnated with a phenol formaldehyde resin are stacked as a substrate 8 to form a substrate. In the case of a low-pressure melamine resin decorative board, a wood-based base such as a hardboard or an inorganic base such as a calcium silicate board is used.

  In the example shown in FIG. 2, the same overlay paper 6 as that used on the surface is laid under the substrate 8. This balances the front and back surfaces of the decorative plate 10 and has an effect of preventing the decorative plate from being warped.

  Since the decorative paper 1 according to the present invention is based on the ink jet printing method, it is possible to print a necessary amount when necessary, and therefore, in many cases, the storage property is not necessary. The shelf life of the paper is good.

  In the decorative board 10 according to the present invention, the decorative paper itself is not impregnated with resin, and the thermosetting resin contained in the resin-impregnated paper placed adjacent to the front and back surfaces is melted and transferred at the time of hot pressure press Since the decorative paper is resinified by this, better results can be obtained by making the base colored titanium paper and the surface overlay paper have a resin impregnation amount larger than usual.

Example 1
Solid base printing (10 g / m ² basis weight, 20 wt% ash content) using an aqueous pigment ink jet printer (PX-H 10000 manufactured by Epson Corporation) to give an ink discharge of 10 g / m ² To make a cosmetic paper. The obtained decorative paper is sandwiched between colored titanium paper impregnated with melamine formaldehyde resin and overlay paper, placed on a phenolic resin-impregnated core paper, inserted into a press, and heated platen temperature 145 ° C., pressure 7. The press was performed at 8 MPaG for 10 minutes. The obtained melamine resin decorative board was evaluated for the reflection density, the resin impregnation property, and the hiding property (transparency).

Comparative Example 1
A decorative paper was prepared in the same manner as in Example 1 except that a material having an ash content of 50% by weight was used as a decorative board base paper, and a melamine resin decorative board was prepared and evaluated in the same manner.

Comparative Example 2
A decorative paper was prepared in the same manner as in Example 1 except that the ink discharge amount was changed to 4.2 g / m ^2, and a melamine resin decorative board was prepared and evaluated in the same manner.

Comparative Example 3
A decorative paper was prepared in the same manner as in Example 1 except that the amount of discharged ink was 17 g / m ^2, and a melamine resin decorative board was prepared and evaluated in the same manner.

  The evaluation results are shown in Table 1.

  The decorative board using the decorative paper of Example 1 had no problems with the reflection density, the melamine resin impregnating property, and the hiding property (transparency), but the decorative board using the decorative paper of Comparative Example 1 had a shielding property It was too high to use the color of the base colored titanium paper. Further, in the decorative board using the decorative paper of Comparative Example 2, the reflection density was insufficient. Moreover, in the decorative board using the decorative paper of Comparative Example 3, swelling occurred at the time of pressing.

DESCRIPTION OF SYMBOLS 1 ... Cosmetic paper 2 ... Design layer 3 ... Ink receptive layer 4 ... Base paper 5 ... Decorative board base paper 6 ... Overlay paper 7 ... Colored titanium paper 8 ... Base material 10 ・ ・ ・ melamine resin decorative board

Claims (4)

  A decorative paper on which a pattern by an inkjet printing method is printed on the surface of a decorative board base paper, the decorative board base paper having an ink receiving layer on the surface, an ash content of 25% by weight or less, and an image density of cyan ink It is characterized in that the reflection density of the cyan ink is 1.3 or more when 100% printing is performed and then overlapping with melamine formaldehyde resin impregnated overlay paper and hot pressing is performed to prepare a melamine resin decorative board. Makeup paper. The decorative paper according to claim 1, wherein the ink discharge amount (Wet) in the inkjet printing is 5 g / m ² or more and 15 g / m ² or less.   A decorative board comprising a decorative board substrate, a colored titanium paper impregnated with melamine formaldehyde resin, the decorative paper according to claim 1 or 2, and a melamine formaldehyde resin impregnated overlay paper in this order.   A decorative paper according to claim 1 or 2 is placed on a colored titanium paper impregnated with melamine formaldehyde resin, and a melamine formaldehyde resin-impregnated overlay paper is placed on the decorative paper to obtain a decorative board base material. A method of manufacturing a decorative board characterized by performing hot pressing and processing together.

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