JPH05222700A - Iridescent paper - Google Patents

Abstract

PURPOSE:To obtain iridescent paper by providing the whole surface of a base paper with fine dotted pattern using a spraying device. CONSTITUTION:150kg of NBKP and 390kg of LBKP are beated into 450ml of C.S.F., which is then incorporated with a rosin sizing agent, starch and fixing agent (aluminum sulfate), and the resulting composition is put to papermaking process using a Fourdrinier machine. In this process, a pattern 2mm in width and 5mm in pitch is watermarked using a dandy roll on the papermaking net, thus obtaining a base paper 1200mm in width, 110g/m<2> in basis weight and 14mum in the centerline mean roughness determined by tracer method. Thence, the whole surface of the base paper is sprayed with a pearl pigment-formulated solution using such a device that ten spray guns are set at equal intervals, followed by drying. In this case, the amount of spray is set at 5g/m<2> and the number of dots at 120/10cm X 10cm on average, thus obtaining the objective iridescent paper highly excellent in designability with fine, iridescent circular and ellipsoidal dots dispersed throughout the surface.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to pearlescent paper. More specifically, the present invention relates to a pearlescent paper on which a fine dot-like pattern formed by a spray device is formed on the entire surface of a base paper.

[0002]

2. Description of the Related Art Conventionally, various types of pearlescent paper have been proposed in the past. For example, Japanese Patent Publication No. 39-29267
In the issue, there is a method of mixing a basic lead carbonate pearl pigment with casein, latex and other binders and applying it to the base paper.
Further, Japanese Patent Publication No. 51-45682 discloses a method of providing a pearl pigment layer on a base paper having a large number of projections and depressions which are patterned and distributed. It describes a method of sequentially providing an aqueous pigment coating layer, an aqueous pearl pigment coating layer, and a water-soluble polymer substance surface treatment layer on paper. Each of these pearlescent papers has a base paper coated with a pearl pigment.

On the other hand, pearl luster paper on which a pearl pigment layer is formed with a specific pattern or pattern is manufactured by using a printing means such as offset printing, letterpress printing or gravure printing. This is a pattern or pattern printed on a paper having a large surface smoothness such as art paper or coated paper by using an ink called "pearl ink" which mainly contains a pearl pigment and a vehicle.

As pearl pigments, natural pearl pigments obtained from fish scales, basic lead carbonate, mica powder, titanium oxide-coated mica powder and the like are well known. These are all
Its shape is flat, and a pearly feeling is developed by arranging the flat shape on the base paper. Therefore, in order to enhance the pearly feeling, the surface smoothness of the base paper should be as high as possible. When a fine pattern or pattern is formed by the printing means as described above, there is a restriction that a base paper having a large surface smoothness must be selected. This is because if the surface smoothness of the base paper is low, the pattern or pattern formed by fine halftone dots cannot be faithfully reproduced on the surface of the base paper. Further, in the printing means, there is a limit to increasing the amount of the pearl ink adhering technically, so that there is a problem that a sufficient pearlescent feeling cannot be obtained. Further, in the case of printing, since the plate making cost is high, there is a problem that the manufacturing cost becomes large with a small order quantity.

[0005]

On the other hand, design paper has a "texture" in its important performance. This can be sensed by touch when touched with the hand, and in order to enhance the texture, the design paper is generally made with a stock having a large freeness (low beating degree). In addition, the surface is often provided with a concavo-convex pattern by means such as a texture breaking method, a felt mark method, a wet embossing method, a dry embossing method, and the surface smoothness is inevitably inferior. Even if such a base paper having a low surface smoothness is used to print a fine pattern or pattern by a printing means, a good pattern or pattern cannot be formed for the reason described above. The results measured by the present inventors show that NBKP is used in the pulp and the freeness is 500 ml C.I. S. F. The surface smoothness of the base paper made in 4) is 4 to 6 μm (evaluated by the center line average roughness by a stylus type surface roughness tester specified in JIS B 0601) and the freeness is 700 ml (unbeaten state). While that of paper is 7 to 10 μm, it is 0.5 to 0.9 μm for commercially available art paper and coated paper capable of printing fine patterns and halftones.

As described above, the present pearlescent paper is
Either pearl pigment is applied to the entire surface, or a pattern or pattern is printed with pearl ink on a base paper with a high surface smoothness, and fine dots are formed on the base paper with a good texture and low surface smoothness. Patterned pearlescent paper is not yet known. The present invention has been made in such a background, using a base paper having a low surface smoothness and an excellent texture, the pearlescent pattern is a fine dot-like pattern, the pearlescent feeling is excellent, and a small amount The main issue is to obtain pearlescent paper that can be manufactured at a low cost even when ordered and has excellent printability.

[0007]

The gist of the present invention is to provide a base paper 1 having a center line average roughness of 4 μm or more measured by a stylus type surface roughness tester specified by JIS B 0601.
A pearlescent paper is obtained by forming a pearlescent pigment dispersion layer 2 on the surface of a pearlescent paper with a spraying device, and the centerline average roughness measured by a stylus type surface roughness tester specified in JIS B 0601 is 4 μm or more. The purpose is to obtain a pearlescent paper in which the pearl pigment dispersion layer 2 is formed on the surface of the paper 1 by a spray device and then the resin coating layer 3 is formed.

The base paper 1 is NBKP, LBKP, NBSP
It is manufactured by using a known paper machine mainly composed of wood pulp such as, and by adding auxiliary materials for paper making such as a sizing agent, a dye / pigment, a filler, a paper strengthening agent, and a fixing agent. At this time, other paper-making fibers such as straw pulp, cotton, etc., seed hair fibers, boiled fibers such as San Tsubaki, Kozo, hemp leaf vein fibers, synthetic fibers such as acrylic and vinylon, and semi-synthetic fibers such as rayon are used together. You can also do it. Base paper 1 is JIS B
It is necessary that the center line average roughness measured by a stylus type surface roughness tester specified by 0601 is 4 μm or more.
If it is lower than m, the texture is deteriorated. Further, in order to improve the designability, a transparent pattern is applied by a paper making net, a floc is formed by a known method such as adding a coagulant or generating a turbulent flow, and the pattern is formed by a dandy roll. Known means such as applying, embossing the wet paper, applying a felt mark, drawing in a foreign material, and embossing the dry paper can be appropriately used. It is also possible to add a wet paper strength enhancer to the paper stock, prepare a non-sized base paper, and impregnate this with synthetic rubber latex or synthetic resin emulsion to use resin-processed paper as the base paper.

The pearl pigment dispersion layer 2 is obtained by spraying the pearl pigment mixture on a base paper using a spray device such as a nozzle or a spray gun. FIG. 2-1 shows a schematic view of an example of the manufacturing process. The base paper unwound from the winding B is sprayed with a pearl pigment mixed solution on the surface by a sprayer S.
Then, it is dried by the drying device D and wound. FIG. 2 shows an example of the spray gun in a sectional view. The pearl pigment blended liquid introduced from the liquid introduction port 21 adjusts the position of the needle valve 23 by rotationally adjusting the injection amount controller 22, mixes with the air introduced from the air inlet 24, and atomizes from the tip of the nozzle. And is sprayed on the base paper 1. The dot pattern can be changed appropriately by adjusting the position of the needle valve, the nozzle diameter, the pressure of the liquid to be introduced, the viscosity, the concentration, the spray angle on the base paper, the distance from the nozzle tip to the base paper, etc. You can The dot-like pattern varies depending on the required design, but is usually 50 per 10 cm x 10 cm of the base paper.
~ 500 pieces are formed. Further, the dot shape is mainly circular to elliptical, and in the case of a circle, its diameter (in the case of an ellipse, its major axis or minor axis) is usually 0.5 to
It is preferably within the range of 5 mm. Application rate of pearl pigment liquid base paper 1 m ² per from 1 to 20 g / m ^2, preferably from 3 to 10 g / m ^2. In the present invention, in order to further enhance the surface smoothness, super calendering treatment can be performed as necessary.

The pearl pigment compounding liquid is obtained by compounding a pearl pigment as a main component with a binder. Known pearl pigments such as natural pearl pigments obtained from fish scales, basic lead carbonate, mica powder, and mica powder coated with titanium oxide can be used, but the titanium oxide coating is the widest choice. Preference is given to using mica powder. The effective particle size is 5 to 150 μm, more preferably 10 to 100 μm. The titanium oxide-coated mica powder is produced by the method described in JP-B-53-47375, JP-B-54-34010, JP-A-58-149959 and the like.

Examples of the binder include emulsion polymerization or emulsion copolymerization of acrylic acid or its ester, methacrylic acid or its ester, vinyl chloride, vinylidene chloride, vinyl acetate, acrylonitrile, butadiene, styrene or the like, or a carboxyl group or a hydroxyl group thereof. Water-dispersible resin (emulsion or latex) with introduced functional groups, starch derivatives such as casein, starch, oxidized starch, dialdehyde starch, cationized starch, acetylated starch, phosphate esterified starch, hydroxyethylated starch, A natural or synthetic water-soluble resin such as polyvinyl alcohol is used alone or in combination of two or more kinds. At this time, a waterproofing agent, a colorant, a viscosity modifier, etc. can be used in combination if necessary. The ratio of the binder added to the pearl pigment is usually 10 parts by weight with respect to 100 parts by weight of the pearl pigment.
0 to 500 parts by weight. When the amount of the binder is less than 100 parts by weight, the strength of the coating layer is insufficient, and when it exceeds 500 parts by weight, the pearlescent feeling is insufficient.

In the pearlescent paper produced by the method described above, the pearl pigment dispersion layer 2 is dispersed on the base paper 1. Therefore, when the pearlescent pigment dispersion layer 2 is printed on the pearly luster paper, the pearlescent pigment has pearlescent ink. The pigment-dispersed portion and the other exposed portion of the base paper are different from each other, which may cause a problem of poor printability. As a result of further studies by the present inventors, this problem was solved by forming the resin coating layer 3 on the pearl pigment dispersion layer 2. By providing the resin coating layer, it is possible to obtain the effect that the ink inking property becomes uniform and the surface strength can be improved. Further, in this configuration, even if the proportion of the binder in the pearl pigment dispersion liquid is small, the resin coating layer can compensate for the lack of adhesive strength, so that the proportion of the pearl pigment can be increased,
The pearlescent feeling can be further enhanced. The resin coating layer is
Among the binders used in the above-mentioned pearl pigment compounding liquid, those having good printability and causing no blocking are appropriately selected and used. The coating amount of the resin coating layer is usually ^{2 to} 15 g / m ² , preferably 5 to 10 g / m ² in terms of solid, and coating is performed using a known coating machine such as an air knife coater or roll coater. Be engineered.

[0013]

EXAMPLES Next, the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples. All parts by weight are dry parts by weight. Example 1 450 ml of NBKP 150 kg and LBKP 390 kg
C. S. F. Rosin sizing agent (trade name "SPN700", manufactured by Arakawa Hayashi Chemical Co., Ltd.) 7.2k
g, starch (trade name “Amicol”, manufactured by Nichidoku Kagaku Co., Ltd.) 3 kg, and a fixing agent (sulfuric acid band) 30 kg were added, and paper was made with a Fourdrinier paper machine. A rade-shaped pattern having a width of 2 mm and a pitch of 5 mm was made transparent by a dandy roll on a paper making net. In this way, the papermaking width is 1200 mm, the basis weight is 110 g / m ² , and the center line average roughness by a stylus meter is 14
A base paper of μm was obtained. Next, a pearl pigment-containing liquid having the following formulation was sprayed on the entire surface using a spray gun having 10 spray guns as shown in FIG. 2, and dried. The amount of spray is 5 g / m ² , the number of dots is 120 on average / 10 cm × 1
It was 0 cm. Pearl pigment blended liquid Mica powder with a particle size of 40 μm and a titanium oxide coverage of 28% 100 parts by weight Acrylic emulsion with a glass transition point of 40 ° C. 60 parts by weight Glass transition point 20 ° C. acrylic emulsion 30 parts by weight Phosphorylated starch 10 parts by weight Water Suitable amount of this As a result, a pearlescent paper having extremely excellent design in which circular and elliptical fine dots having pearly luster were scattered on the entire surface of the base paper was obtained.

Example 2 3 g of esterified starch (trade name "Vetrocoat UJ2200" manufactured by Nitto Kagaku Co., Ltd.) was added to the pearlescent paper of Example 1.
/ M ² Air knife coater was used for coating. As a result, a pearlescent paper having good ink receptivity was obtained.

[0015]

The present invention is constructed as described above,
The dot pattern formed by the pearl pigment dispersion liquid can be obtained with a thickness that cannot be obtained by printing technology, and pearlescent paper with unprecedented design, which reminds us of a star shining in full sky, can be obtained. The pearlescent paper having a resin coating layer formed on the surface has excellent printability, is capable of offset multicolor printing, and has excellent effects such as efficient production in a small lot.

[Brief description of drawings]

FIG. 1 is a perspective view (FIG. 1-1) and a cross-sectional view (FIG. 1-2) of an embodiment of the pearlescent paper of the present invention.

FIG. 2 is an example of a manufacturing process of the pearlescent paper of the present invention (FIG. 2
-1) and the spray device used for it (Fig. 2-2).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base paper 2 Pearl pigment dispersion layer 3 Resin coating layer 21 Liquid introduction port 22 Injection amount controller 23 Needle valve 24 Air inlet B Base paper winding S Spray device D Drying device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location 7199-3B D21H 1/22 B

Claims (2)

[Claims] 1. A pearl pigment dispersion layer 2 is sprayed onto a surface of a base paper 1 having a center line average roughness of 4 μm or more measured by a stylus type surface roughness tester specified in JIS B 0601 by a spraying device.
A pearlescent paper characterized by being formed. 2. A pearl pigment dispersion layer 2 is sprayed onto a surface of a base paper 1 having a center line average roughness of 4 μm or more measured by a stylus type surface roughness tester specified by JIS B 0601 by a spray device.
And a resin coating layer 3 are formed on the pearlescent paper.