JP2005264369A - Album base paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide album base paper containing an ultralow content of air nipped between the base paper surface and a laminated film and a film and having high surface smoothness. <P>SOLUTION: The album base paper is composed of two or more paper layers and at least one surface layer contains 5-35 mass% of ash. The surface roughness of the surface layer is 10-14 μm. Talc is preferably used as the ash. The freeness of pulp forming the surface layer is preferably 250-450 ml and a dry paper strengthening agent such as an amphoteric polyacrylamide paper strengthening agent is preferably compounded in the surface layer. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an album base paper having a high surface smoothness.

  Photo album mounts are widely used in which a transparent film is pasted on the surface of album base paper coated with an adhesive (see, for example, Patent Documents 1 and 2). The film stuck on the adhesive coated surface of the album base paper can be peeled off and stuck freely, and when using, the photograph is placed on the album base paper after peeling the pasted film once, Affix the film to the surface of the album paper again.

When the film is peeled off and pasted, the surface of the album base paper has slight irregularities, so that air is sandwiched between the pressure-sensitive adhesive coated surface and the film, which deteriorates the appearance. In particular, when the album base paper is colored, there is a problem because the color seen through the film becomes whitish than the original color of the album base paper. In order to prevent this problem, the album base paper to which the film is attached is required to have high surface smoothness. The conventional methods used when making paper with a paper machine to improve the smoothness of the album base paper surface are as follows.
(1) Method of increasing the linear pressure of the press roll in the pressing step (2) Method of applying a surface treatment agent such as polyvinyl alcohol to the surface of the album base paper (3) Method of increasing the linear pressure of the calendar roll in the calendar step The method 1) has the disadvantage that the paper thickness decreases, and a sufficient effect cannot be obtained. The method (2) cannot obtain a sufficient effect. The method (3) has the disadvantage that the paper thickness decreases, and when the line pressure is excessively increased, the appearance may deteriorate due to calendering.
Japanese Patent Application No. 9-136495 (Claims) JP 11-48667 A (Claims)

  The object of the present invention is that the smoothness of the surface is high, and when the adhesive is applied to the surface and the film is attached, the air that is sandwiched between the attached film due to surface irregularities The purpose is to provide a very small amount of album base paper.

  As a result of intensive studies, the inventors have found that an album base paper having a predetermined surface roughness and a high smoothness can be obtained by setting the content of ash contained in at least one surface layer to a predetermined range. The invention has been completed.

  The present invention for solving the above problems is described below.

  [1] An album base paper comprising two or more paper layers, wherein at least one surface layer contains 5 to 35% by mass of ash, and the surface roughness of the surface layer is 10 to 14 μm.

  [2] The album base paper according to [1], wherein the surface layer contains a dry paper strength enhancer in an amount of 0.1 to 3.5 parts by mass with respect to 100 parts by mass of pulp solid content.

  [3] The album base paper according to [1] or [2], wherein the freeness of the pulp forming the surface layer is 250 to 450 ml.

  [4] The album base paper according to any one of [1] to [3], wherein the ash is talc.

  The album base paper of the present invention is excellent in surface smoothness because the content of ash contained in at least one surface layer is within a predetermined range. When an adhesive is applied to the surface of the album base paper of the present invention, and the film is pasted to form an album mount, the surface of the album mount is caused by surface irregularities even if the film is peeled off and pasted. Since the amount of air sandwiched between the film and the film is small, a good appearance can be maintained.

  The album base paper of the present invention comprises at least a first surface layer and a second surface layer, but an intermediate layer may be provided if necessary. The layers constituting the album base paper may be three layers having one middle layer between the first surface layer and the second surface layer, but a total of 4 to 9 layers in which 2 to 7 middle layers are provided. It is preferable.

  At least one surface layer of the album base paper contains 5 to 35% by mass of ash as an essential component, but the content of ash in the surface layer is more preferably 5 to 30% by mass, and 5 to 20% by mass. Is particularly preferred. If the amount is less than 5% by mass, the smoothness of the surface cannot be sufficiently increased. If the amount exceeds 35% by mass, an effect commensurate with the content cannot be obtained, and it is rather uneconomical.

Examples of ash include titanium oxide (TiO ₂ ), zinc white (ZnO), lithopone (ZnO + BaSO ₄ ), white lead (2PbCO ₃ · Pb (OH) ₂ ), calcium carbonate (CaCO ₃ ), barium sulfate ( BaSO ₄ ), clay (Al ₂ O ₃ · 2SiO ₂ · H ₂ O), silica (SiO ₂ or SiO ₂ · nH ₂ O), talc (3MgO · 4SiO ₂ · H ₂ O), aluminum hydroxide (Al ( OH) ₃ ) and the like. Of these, talc is preferably used.

  The average particle size of ash is preferably 3 to 15 μm, and more preferably 5 to 12 μm. If the thickness is less than 3 μm, the ash will flow out into the waste water during papermaking, so the yield tends to be poor. If the thickness exceeds 15 μm, the surface roughness of the obtained base paper tends to increase.

  In the album base paper of the present invention, the surface roughness of the surface layer containing the ash (hereinafter simply referred to as the surface layer) is 10 to 14 μm, preferably 10 to 13 μm. The surface roughness of the surface layer can be set to such a range by adjusting the content of ash contained in the surface layer within the above range.

  In addition, the surface roughness of the album base paper manufactured conventionally is 14 to 18 μm, and the album base paper of the present invention can have the surface roughness within the above range by setting the ash content within the above range. It has become.

  The pulp freeness (Canadian standard freeness) constituting the surface layer is preferably 250 to 450 ml, more preferably 300 to 450 ml. When the amount is less than 250 ml, the drainage is poor, and thus the productivity is deteriorated. When the amount exceeds 450 ml, the surface roughness increases. The freeness of the pulp can be within the above range by changing the beating degree of the raw pulp.

  As the pulp forming the surface layer, virgin pulp such as bleached kraft pulp, unbleached kraft pulp, and mechanical pulp can be used regardless of the species of hardwood or softwood. In addition, used paper pulp such as used corrugated paper, old paper, old newspaper, magazine used paper, colored used paper, Kent used paper, coated used paper, high quality used paper can be used according to the strength and appearance required of the album base paper. .

  The surface layer is preferably blended with a dry paper strength enhancer in order to improve the yield of ash during papermaking.

  Examples of the dry paper strength enhancer include copolymers of acrylamide and a cationic monomer such as acrylamide-vinyl monomer copolymer, acrylamide-dimethylaminoethyl methacrylate copolymer, Mannich modified polyacrylamide, Hoffman-decomposed polyacrylamide, etc. Amphoteric polyacrylamide-based paper strength enhancers; polyamide epichlorohydrin-based paper strength enhancers; starches such as starch, oxidized starch and carboxymethylated starch; plant gums; polyvinyl alcohol; carboxymethylcellulose and the like. Among them, it is preferable to use an amphoteric polyacrylamide type paper strength enhancer.

  As content of the dry paper strength enhancer in the said surface layer, it is preferable to set it as 0.5-3.5 mass part with respect to 100 mass parts of pulp solid content, and setting it as 0.7-3.0 mass part Is more preferable. If the content of the dry paper strength enhancer is less than 0.5 parts by mass, the effect of improving the yield of ash is insufficient, and if it exceeds 3.5 parts by mass, it is difficult to obtain an effect commensurate with the amount added.

  The surface layer may contain additives other than ash and a dry paper strength enhancer. Examples of the additive include a sulfuric acid band, a sizing agent, a wet paper strength enhancer, and an antifoaming agent.

  The kind of pulp used for the paper layers (middle layer and other surface layers) other than the surface layer constituting the album base paper of the present invention can be the same as that for the surface layer. Further, the paper layer other than the surface layer may contain a known additive.

Basis weight based on JISP-8124 albums base paper is preferably in a 100 to 400 g / m ^2, and more preferably a 120~340g / m ^2.

  The thickness based on JISP-8118 of the album base paper is preferably 120 to 480 μm, and more preferably 140 to 410 μm.

The album base paper of the present invention can be manufactured using a known multilayer paper machine by the following steps.
(1) If necessary, agents such as ash and dry paper strength enhancer are added to and mixed with slurry obtained by dispersing pulp in water to produce raw materials for the first surface layer, middle layer and second surface layer. To do.
(2) Each paper stock is made on a wire and put together.
(3) Press with a pressure roll to remove moisture.
(4) Dry with a dryer cylinder, and if necessary, apply the drug using a calendar.
(5) Wind up on a reel to obtain album base paper.

  A cross-sectional view of an example of an album board using the album base paper of the present invention is shown in FIG. The album mount 100 includes an album base paper 1, an adhesive layer 5 made of an adhesive coated on the surface of the album base paper 1, and a film 3. The album base paper 1 is composed of three layers: a first surface layer 7, a middle layer 9, and a second surface layer 11. As for the 1st surface layer 7, content of ash and the surface roughness of the surface 13 which coated the adhesive are in the said range. As the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 5, known pressure-sensitive adhesives used for album mounts can be used. As the film 3, a known transparent film such as a polyester film, a polyethylene film, or a polypropylene film can be used.

EXAMPLES Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited thereto. (Hereinafter, kg / t represents the amount of chemical added in the form per pulp ton.)
Examples 1-7, Comparative Examples 1-5
60 parts by mass of beaten hardwood kraft pulp (LBPK) and 40 parts by mass of upper white waste paper pulp were mixed to prepare a raw material. To this material, talc (SW manufactured by Nippon Talc Co., Ltd.), amphoteric polyacrylamide (Harmide RB32 manufactured by Harima Kasei Co., Ltd.) as a dry paper strength enhancer, sulfuric acid band 40 kg / t, acidic rosin emulsion sizing agent (solid content 50% by mass) ) 8 kg / t was added to obtain a raw material for the first layer. A sulfuric acid band of 30 kg / t was added to a raw material in which 70 parts by mass of ground paper waste and 30 parts by weight of corrugated paper were mixed to obtain a raw material for the second to fifth layers. The raw materials for the 1st to 5th layers are supplied to a circular multi-layer paper making machine, the paper making speed is 180 m / min, 5 layers paper is made, pressed, dried, and wound on a reel It was.

Tables 1 and 2 show the contents of the talc and the dry paper strength enhancer in the first layer of the obtained base paper, the freeness of the pulp constituting the first layer, and the surface roughness of the first layer side surface. In addition, content of a dry paper strength enhancer shows the value with respect to 100 mass parts of pulp solid content of a 1st layer. Pulp freeness was measured with a Canadian standard freeness tester. The surface roughness is a 10-point average value of values measured according to JIS B0601. All of the album base papers had a basis weight of 240 g / m ² and a thickness of 290 μm.

An acrylic pressure-sensitive adhesive was applied to the surface of the resulting album base paper on the first layer side in a diagonal lattice pattern, and then a polyester film was adhered to the pressure-sensitive adhesive application surface to obtain an album mount. After peeling and sticking the film of the album mount 10 times each, the surface roughness of the album base paper and the bonding of the film were evaluated according to the following criteria. The results are also shown in Tables 1 and 2.
Evaluation standard (double-circle): The surface is flat and the bonding of a film is uniform.
○: There are slight irregularities on the surface, but there is no air trapped.
(Triangle | delta): The unevenness | corrugation of the surface is conspicuous and air | sandwiching is a part.
X: A lot of surface irregularities are conspicuous, and the air is strongly caught.

It is sectional drawing which shows an example of the album mount using the album base paper of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Album base paper 3 Film 5 Adhesive layer 7 1st surface layer 9 Middle layer 11 2nd surface layer 13 Surface 100 Album mount

Claims (4)

An album base paper comprising two or more paper layers, wherein at least one surface layer contains 5 to 35% by mass of ash and the surface roughness of the surface layer is 10 to 14 μm. The album base paper according to claim 1, wherein the surface layer contains a dry paper strength enhancer in an amount of 0.1 to 3.5 parts by mass with respect to 100 parts by mass of pulp solid content. The album base paper according to claim 1 or 2, wherein the freeness of the pulp forming the surface layer is 250 to 450 ml. 4. The album base paper according to claim 1, wherein the ash content is talc.

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