JP4694910B2 - Decorative printing paper - Google Patents

Description

  The present invention has no problem with the laminating process, and even if it is a decorative paper for surface decoration on a base material that requires a press pasting process, it has a quality and is punctured (air swell). The present invention relates to a decorative paper that hardly causes poor adhesion.

  Conventionally, as a wall covering material, ceiling material, flooring material in a building such as a house, the surface of a base material such as plywood or gypsum board is printed with a pattern such as a wood grain pattern or an abstract pattern on paper or plastic film. A decorative board to which printed matter (decorative printing paper or the like) having a concavo-convex pattern by visual embossing (GM expression) or embossing is adhered is widely used.

In the above-mentioned adhesive processing method, there are two main types of laminate processing, which is superior in productivity, and press processing, which is superior in terms of quality. Especially when processing paper and plastic films, laminating processing is Although it has become mainstream, in the case of paper, there are cases where it is pointed out that the strength is insufficient (such as delamination strength), and as a countermeasure, printing decorative paper using resin-reinforced impregnated paper is generally used. (For example, refer to Patent Document 1, Patent Document 2, and Patent Document 3).
JP-A-11-117190 JP 2001-113662 A JP 2002-190398 A

However, also in the laminating process, in the case of resin-reinforced impregnated paper, the adhesiveness with the adhesive may be lowered, so that generally a resin impregnated rate is reduced.

  In contrast, in press processing, which should have an advantage in terms of pasting quality, it is generally understood that the use of printed decorative paper using resin-reinforced impregnated paper has further advantages in quality. However, it is rarely used today because the following problems were pointed out at the same time.

  In decorative printing paper using general resin reinforced impregnated paper, steam loss (adhesive factor: water vapor, solvent vapor, etc.) generated during press processing and partial puncture (adhesion failure) due to air leakage are likely to occur. Along with this, the defective rate (lowering production efficiency) is increased, and inevitably laminating has become the mainstream for bonding processing of general resin-reinforced impregnated paper, bringing about quality limitations.

  As a method of enabling press processing (preventing puncture), it is effective to increase the breathability (decreasing the air permeability) of decorative printing paper, but this also causes a decrease in quality and designability. It will be.

Further, even during laminating, a general resin-reinforced impregnated paper has a problem in adhesive adhesion (penetration), which may cause poor adhesion.

  The present invention solves the above-described problems and provides an inexpensive decorative paper that is excellent not only in ordinary laminating processing but also in press pasting suitability and having both design and physical properties.

The present invention includes 80% or more of softwood (N material) as the material of the original base paper, the resin impregnation rate is 20 to 40%, the air permeability (JIS P 8117) is 100 seconds or less, and the smoothness (JIS P 8119) 200-700 seconds, delamination strength (JIS P 8113) 230 g / 15 mm or more basis weight 25-60 g / m ² is mainly composed of resin reinforced impregnated paper excellent in printability, The ink coating amount (after drying) of the printing layer is 6 g / m ² or more and 15 g / m ² or less, and the coating amount of the surface protective resin layer (after drying) is 2 g / m ² or more and 20 g / m ² or less. Cosmetics characterized by having about 3 to 10 irregular holes with an average diameter of 50 to 200 μm / 25 mm ² and air permeability (JIS P 8117) of 1000 seconds or less, although a wide range of settings is possible. It is printed paper.

  By using the printing paper of the present invention, it has become possible to press and laminate high-resin reinforced impregnated paper, which has normally been difficult.

  Hereinafter, an embodiment of the present invention will be described with reference to the sectional view of the decorative paper of FIG. 1 or FIG.

The decorative printing paper of the present invention has an air permeability (JIS P 8117) of 100 seconds or less as the base paper C, a smoothness (JIS P 8119) of 200 to 700 seconds, and an interlayer peel strength (JIS P 8113) of 230 g / 15 mm or more. It is important to use a resin-reinforced impregnated paper having a basis weight of 25 to 60 g / m ² . Specifically, as an original sheet for creating a resin reinforced impregnated paper is thin (18~45g / m ²⁾ in the gap with many building materials paper or titanium paper low fiber density, such as tissue paper, the use of non-woven fabric or the like I can do it.

However, it is desirable for the original base paper to satisfy the following conditions.
The fibers constituting the base paper may be woody or non-woody (synthetic fiber, etc.), but are close to no size (good water absorption) (size: about 0 to 2S) ), The air permeability is preferably 0 to 10S.

The fiber mixing ratio softwood the (N material) is 80% or more.

  Also, a mixed paper (manufactured) of wood material and non-wood material fibers may be used.

When the original base paper that does not satisfy the above conditions is used and impregnated with the following resin, it approaches a general resin reinforced impregnated paper, and press adhering processing suitability is impaired.

Further, when the fiber mixing ratio is centered on the hardwood material (L material), the air permeability (JIS P 8117) is 100 seconds or less and the irregular holes having an average diameter of 50 to 200 μ are made to have about 3 to 10 holes / 25 mm ² . Therefore, it is necessary to perform post-processing (perforation processing).

However, since the delamination strength (JIS P 8113) is reduced at the same time as the perforating process (same as general resin reinforced impregnated paper), it is necessary to balance both.

The quality conditions of the general resin reinforced impregnated paper being compared here are: air permeability (JIS P 8117) 400 seconds or more, smoothness (JIS P 8119) 400 seconds or more, delamination strength (JIS P 8113) 200 g / The average basis weight is about 15 to 80 g / m ^{2 at} about 15 mm.

The impregnation of the resin may be performed from one side of the original base paper or from both sides simultaneously . The resin impregnation ratio (resin weight ratio in the weight after impregnation) is 20 to 40% . If it is 20% or less, the delamination strength (JIS P 8113) is lowered, and at the same time, irregular holes are enlarged (300 μm or more), and a large number of them are generated, and there is a problem in proper use. Moreover, if it is 40% or more, the excess resin that could not be entangled with the base paper fibers may damage the production equipment, and the irregular shape holes with an average diameter of 50 to 200 μ which is the skeleton of the present invention have an average diameter of 15 μ or less. become.

  The presence of the irregular holes having an average diameter of 50 to 200 μm can expect the following effects.

  (1) Vapor loss generated during press working (adhesive factor: water vapor / solvent vapor) and partial puncture due to air loss are improved.

  (2) Improvement in adhesion due to an increase in the adhesive surface area of the back surface and the penetration effect of the adhesive.

The resin impregnated in the base paper is not particularly limited, but in recent years, considering environmental problems, a resin that can be impregnated by dissolving or dispersing in water is desirable. For example, acrylic resin, polyvinyl alcohol, polyacrylamide, etc. Use a water-soluble resin, synthetic latex such as styrene-butadiene, acrylic-butadiene, etc., or a single or mixture of synthetic resin emulsions such as acrylic, styrene, and vinyl acetate. It is also possible to use a thermosetting resin in combination with a crosslinking agent such as an epoxy compound or an isocyanate compound.

The base paper is uniformly impregnated with the above resin and then dried through a dryer. Thereafter, a super calender or a heat calender (electric heat) can be applied to adjust the smoothness (improving the printability), but it is not necessary to apply it.

  There is no restriction on the method of forming the pattern printing layer B / B ′ on the resin-reinforced impregnated paper C obtained by the above processing, for example, gravure printing method, offset printing method, letterpress printing method, screen printing method, flexographic printing method, Any known printing method such as an inkjet printing method is possible.

  There are no restrictions on the ink for forming the pattern printing layer B / B ', and any known ink such as nitrocellulose-based, urethane-based, acrylic vinyl acetate-based, epoxy-based, cellulose acetate-based heat, ultraviolet / electronic Any wire-curing material can be used.

  For the above-mentioned optional ink (pattern printing layer B / B ′), one kind of additive, if necessary, for example, matting agent, brightener, anti-mold agent, anti-slip agent, slip agent, UV absorber, isocyanate, etc. As mentioned above, it can also add as needed.

The ink application amount (after drying) of the pattern printing layers B and B ′ is preferably 6 g / m ² or more and 15 g / m ² or less in total of the concealed solid layer and the pattern ink layer, especially when it is less than 6 g / m ^2. However, there is a problem in the concealability as printing paper, and at the same time, there is a risk that the adhesive spreads to the printing surface during the pasting process and damages the processing equipment. ^{On the other hand} , if it exceeds 15 g / m ² , the air permeability increases and the superiority of the pasting process is impaired.

  There is no restriction | limiting in particular in the coating method of the surface protection resin layer A, For example, well-known arbitrary coating methods, such as a gravure coat method, a lip coat method, a spray coat method, are possible.

  There is no restriction on the resin forming the surface protective resin layer A, and any known resin such as melamine resin, phenol resin, urea resin, epoxy resin, aminoalkylate resin, urethane resin, polyester resin, etc. Thermosetting such as resin and silicone resin, ultraviolet / electron beam curable resin, and the like can be used. The surface protective resin layer A is preferably transparent, but may be colored or translucent to such an extent that the design (visibility) of the pattern print layers B and B ′ is not impaired.

  For the above optional resin (surface protective resin layer A resin), additives as necessary, for example, matting agents, brighteners, flame retardants, antibacterial agents, antifungal agents, antiwear agents, slip agents, UV absorbers One or more of these may be added as necessary.

The resin coating amount (after drying) of the surface protective resin layer A is 2 g / m ² or more and 20 g / m ² or less .
If it is less than 2 g / m ² , there is a problem with the surface quality (stain resistance, scratch resistance, etc.) of the decorative paper, and at the same time, there is a risk that the adhesive will ooze out during press bonding and damage the processing equipment. Comes out.
^{On the other hand} , if it exceeds 20 g / m ² , the air permeability is increased, and the irregular hole diameter is also less than 50 μm.

  Specific examples and comparative examples of the decorative paper of the present invention are shown below, and the present invention will be described in more detail.

[Example 1]
Fiber mixing ratio, softwood 100%, an air permeability (JIS P 8117) 0 seconds, a basis weight of 30.2 g / ^{m 2,} was impregnated from both sides of the original sheet to the polyacrylamide-based water-soluble resin of the size of one second, supercapacitor A resin-reinforced impregnated paper subjected to render smoothing was prepared.

The resin reinforced impregnated paper was printed with a wood grain pattern by a gravure printing method using urethane-based ink for building material thin paper. The coating amount of the pattern print layer at that time was about 9.6 g / m ² .
Next, a transparent resin having the following composition is applied onto the printed surface by a gravure coating method, and a coating amount of 6.5 g / m ² after drying is applied and dried, followed by aging at 80 ° C. for 72 hours to obtain a surface protective resin layer. Was fully cured to complete the decorative paper of the present invention.

Composition of coating liquid for surface protective resin layer Polyester polyol-based gloss varnish 60 parts Polyester polyol-based mat varnish 40 parts Isocyanate-based curing agent 30 parts Silicone-based slip agent 10 parts Urethane solvent 25 parts Viscosity Zaan cup # 4 9.5 seconds

[Example 2]
Fiber mixing ratio, softwood 95%, 5% chemical fiber, air permeability (JIS P 8117) 2 seconds, impregnated basis weight 45.1 g / ^{m 2,} a polyacrylamide-based water-soluble resin based on the base paper of the size of one second from both sides Then, a resin-reinforced impregnated paper subjected to a heat calender smoothing process was prepared.

The above-mentioned resin-reinforced impregnated paper was printed with a wood grain pattern by a gravure printing method using a nitrocellulose-based ink for building material thin paper. The coating amount of the pattern print layer at that time was about 10.7 g / m ² .
Next, a transparent resin having the following composition is coated on the printed surface by a gravure coating method, and a coating amount of 13.5 g / m ² after drying is applied and dried, followed by aging at 80 ° C. for 72 hours to obtain a surface protective resin layer. Was fully cured to complete the decorative paper of the present invention.

Composition of coating liquid for surface protective resin layer Polyester polyol-based gloss varnish 50 parts Polyester polyol-based mat varnish 50 parts Isocyanate-based curing agent 30 parts Silicone-based slip agent 10 parts Urethane solvent 25 parts Viscosity Zaan cup # 4 10.5 seconds

[Comparative Example 1]
Super-calendane is impregnated with a polyacrylamide water-soluble resin on both sides of an original base paper with fiber mixing ratio, hardwood 100%, air permeability (JIS P 8117) 28 seconds, basis weight 28.8 g / m ² , size size 2 seconds A resin-reinforced impregnated paper subjected to a smooth treatment was prepared.

  Hereinafter, the printing formation of the wood grain pattern printing layer and the coating formation of the surface protective resin layer are sequentially performed under the same conditions in Example 1, and then dried, and the surface protective resin layer is sufficiently cured by aging at 80 ° C. for 72 hours. Thus, a comparative decorative paper of the present invention was obtained.

[Comparative Example 2]
Fiber mixing ratio, hardwood 100%, an air permeability (JIS P 8117) 35 seconds, a basis weight of 48.1 g / ^{m 2,} a polyacrylamide-based water-soluble resin based on the base paper size of 2 seconds impregnated from both sides, Hitokya A resin-reinforced impregnated paper subjected to render smoothing was prepared.

Hereinafter, the printing formation of the wood grain pattern printing layer and the coating formation of the surface protection resin layer are sequentially performed under the same conditions in Example 2, and the surface protection resin layer is sufficiently cured by aging at 80 ° C. for 72 hours. Thus, a comparative decorative paper of the present invention was obtained.
The quality results of Example 1 and Comparative Example 1 are shown below.

About the pasting process appropriateness of Example 1 and 2 and Comparative Example 1 and 2 , the result of having implemented press pasting process comparison.
No puncture was generated for the samples of Examples 1 and 2 , but puncture was generated for the samples of Comparative Examples 1 and 2 .
The results of comparison of physical properties of pasted products are shown below.

  The tests shown in Tables 4 and 5 above are the test items in the Japanese Agricultural Standard

  3 to 6 show enlarged photomicrographs of the decorative paper surfaces of Examples 1 and 2. FIG.

3 is a 100 × magnified photograph of the decorative paper of Example 1, FIG. 4 is a 1000 × magnified photo of the same, FIG. 5 is a 100 × magnified photograph of the decorative paper of Example 2, and FIG. 6 is a 1000 × magnified photo of the same. is there.

  Furthermore, for comparison, the 100 times magnified photograph of the decorative paper of Comparative Example 1 is shown in FIG. 7, the 1000 times magnified photograph of FIG. 8 is shown, the 100 times magnified photograph of the decorative paper of Comparative Example 2 is shown in FIG. A double magnified photograph is shown in FIG.

Comparing FIG. 3 to FIG. 10, it can be seen that the decorative paper of the present invention has a larger number of large holes on the surface than the conventional decorative paper, and has high air permeability (low air permeability ) .

Cross section of decorative paper of this invention Cross section of decorative paper of this invention 100 times magnified photograph of the surface of the decorative paper of Example 1 1000 times magnified photograph of the surface of the decorative paper of Example 1 100 times magnified photograph of the surface of the decorative paper of Example 2 1000 times magnified photograph of the surface of the decorative paper of Example 2 100x magnified photograph of the decorative paper surface of Comparative Example 1 1000 times magnified photo of the decorative paper surface of Comparative Example 1 100 times magnified photograph of the surface of the decorative paper of Comparative Example 2 1000 times magnified photograph of the surface of the decorative paper of Comparative Example 2

Explanation of symbols

A Surface protective resin layer B Picture print layer B 'Picture pattern layer C Resin-reinforced impregnated paper

Claims (1)

Containing 80% or more of softwood material (N material) as a raw material of raw paper, resin impregnation rate is 20 to 40%, air permeability (JIS P 8117) is 100 seconds or less, and smoothness (JIS P 8119) 200 ~ 700 seconds, delamination strength (JIS P 8113) 230 g / 15 mm or more basis weight 25-60 g / m ² surface of a resin reinforced impregnated paper excellent in printability , the ink coating amount (after drying) is 6 g / m ² or more 15 g / ^{m 2} or less of the picture-printed layer, and, while the coating weight (post-drying) is formed 2 g / ^{m 2} or more 20 g / ^{m 2} or less of the surface protective resin layer, the average diameter 50~200μ not A decorative printing paper having about 3 to 10 shaped holes / 25 mm ^{2 and} having an air permeability (JIS P 8117) of 1000 seconds or less .

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