KR20160137317A - Recording paper and method for manufacturing the same - Google Patents
Recording paper and method for manufacturing the same Download PDFInfo
- Publication number
- KR20160137317A KR20160137317A KR1020150140787A KR20150140787A KR20160137317A KR 20160137317 A KR20160137317 A KR 20160137317A KR 1020150140787 A KR1020150140787 A KR 1020150140787A KR 20150140787 A KR20150140787 A KR 20150140787A KR 20160137317 A KR20160137317 A KR 20160137317A
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- KR
- South Korea
- Prior art keywords
- paper
- base material
- paper base
- magnetic material
- recording paper
- Prior art date
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
- D21H21/42—Ribbons or strips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/04—Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
Landscapes
- Laminated Bodies (AREA)
- Paper (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Credit Cards Or The Like (AREA)
- Magnetic Record Carriers (AREA)
Abstract
SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording paper in which the occurrence of a step on a surface caused by a magnetic material is suppressed.
As means for solving such a problem. 1. A magnetic recording medium comprising a first paper base material, a second paper base material adhered to the first paper base material, and a magnetic material disposed between the first paper base material and the second paper base material, And a recording paper having a large ratio of entering into one side of the first paper substrate or the second paper substrate with respect to the concave surface of the second paper substrate.
Description
The present invention relates to a recording paper and a method for producing the recording paper.
For example, Patent Document 1 discloses a magnetic insert sheet comprising two kinds of magnetic threads having magnetic properties different from each other, wherein the sheet is composed of three layers of paper layers, Wherein a first magnetic thread is inserted between the second layer and a second magnetic thread is inserted between the second layer and the third layer and the two magnetic threads are parallel to each other and linear Magnetic substance insertion sheet "
The object of the present invention is to provide a recording paper having a magnetic material disposed between a first paper base material and a second paper base material bonded to the first paper base material, The present invention provides a recording paper in which the occurrence of a step on a surface caused by a magnetic material is suppressed as compared with a case where both the first paper base material and the second paper base material have the same ratio with respect to the concave surface of the base material.
The above problem is solved by the following means. In other words,
According to a first aspect of the present invention,
A first paper substrate,
A second paper base material bonded to the first paper base material,
And a magnetic material disposed between the first paper substrate and the second paper substrate,
Wherein the magnetic material is a recording paper having a large ratio of entering the one side of the first paper base or the second paper base with respect to the concave surface of the first paper base and the second paper base.
According to a second aspect of the present invention,
The method according to claim 1,
The shortest distance a from the surface of the first paper substrate to the magnetic material, and the shortest distance b from the surface of the second paper substrate to the magnetic material, the shortest distance a and the shortest distance b, the value c obtained by dividing the smaller one of the shortest distances into the larger one of the shortest distances is 0.5? c? 0.9.
According to a third aspect of the present invention,
3. The method according to claim 1 or 2,
And the density of the first paper base material and the second paper base material is 0.4 g / cm3 or more and 1.0 g / cm3 or less, respectively.
According to a fourth aspect of the present invention,
A first paper substrate,
A second paper base material bonded to the first paper base material,
And a magnetic material disposed between the first paper substrate and the second paper substrate,
The difference in density between the first paper base material and the second paper base material is not less than 0.1 g / cm 3 and not more than 0.4 g / cm 3.
According to a fifth aspect of the present invention,
5. The method of claim 4,
And the density of the first paper base material and the second paper base material is 0.4 g / cm3 or more and 1.0 g / cm3 or less, respectively.
According to a sixth aspect of the present invention,
A magnetic material disposing step of disposing a magnetic material on a paper base material of either a first paper base material or a second paper base material;
And a bonding step of bonding the other paper base material to one of the paper base materials on which the magnetic material is disposed so as to sandwich the magnetic material therebetween,
Wherein a difference in density between the first paper base material and the second paper base material is not less than 0.1 g / cm 3 and not more than 0.4 g / cm 3.
According to a seventh aspect of the present invention,
The method according to claim 6,
And the density of the first paper base material and the second paper base material is 0.4 g / cm3 or more and 1.0 g / cm3 or less, respectively.
According to a first aspect of the present invention, there is provided a recording paper having a magnetic material disposed between a first paper base material and a second paper base material which is bonded to the first paper base material, , A recording paper in which the occurrence of a step on a surface caused by a magnetic material is suppressed is provided as compared with a case where both of the first paper base material and the second paper base material are contained in the same ratio.
The shortest distance a from the surface of the first paper base material to the magnetic material and the shortest distance b from the surface of the second paper base material to the magnetic material satisfy the relationship of the shortest distance a and the shortest distance b, There is provided a recording paper in which the occurrence of a step on the surface caused by the magnetic material is suppressed as compared with a case where the value c obtained by dividing the smallest distance by the shortest distance by the shortest distance is less than 0.5 or exceeds 0.9.
According to the invention as set forth in claim 3, as compared with the case where the magnetic material contains both the first paper base material and the second paper base material in the same ratio with respect to the concave surface of the first paper base material and the second paper base material, 1, the density of the paper base material and the second paper base is 0.4 g / cm3 or more and 1.0 g / cm3 or less, respectively, and the occurrence of the step on the surface caused by the magnetic material is suppressed.
According to a fourth aspect of the present invention, there is provided a recording paper having a magnetic material disposed between a first paper base material and a second paper base material bonded to the first paper base material, wherein the difference in density between the first paper base material and the second paper base is 0.1 g / Or more than 0.4 g / cm < 3 >, the generation of the step on the surface caused by the magnetic material is suppressed.
According to the invention according to claim 5, as compared with the case where the difference in density between the first paper substrate and the second paper substrate is less than 0.1 g / cm 3 or exceeds 0.4 g / cm 3, Density of not less than 0.4 g / cm3 and not more than 1.0 g / cm3, respectively, and the occurrence of a step on the surface caused by the magnetic material is suppressed.
According to a sixth aspect of the present invention, there is provided a method of manufacturing a magnetic recording medium, comprising the steps of: arranging a magnetic material on a paper base material of either a first paper base material or a second paper base material; Wherein the difference in density between the first paper substrate and the second paper substrate is less than 0.1 g / cm < 3 > or the difference between the density of the first paper substrate and the second paper substrate is less than 0.1 g / There is provided a method of producing a recording paper in which generation of a step on a surface caused by a magnetic material is suppressed as compared with the case where the magnetic material exceeds 0.4 g / cm < 3 >.
According to the invention as set forth in claim 7, as compared with the case where the difference in density between the first paper substrate and the second paper substrate is less than 0.1 g / cm 3 or exceeds 0.4 g / cm 3, A density of 0.4 g / cm 3 or more and 1.0 g / cm 3 or less, respectively, and the occurrence of a step on the surface caused by the magnetic material is suppressed.
1 is a plan view showing an example of recording paper according to the first embodiment;
2 is a cross-sectional view showing an example of recording paper according to the first embodiment;
3 is a cross-sectional view showing an example of recording paper according to the second embodiment.
4 is a schematic structural view showing a manufacturing apparatus for manufacturing a recording paper according to a fourth embodiment;
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, members having substantially the same function are denoted by the same reference numerals throughout the drawings, and redundant descriptions may be omitted.
<Recording paper>
1 is a plan view showing the
(First Embodiment)
1 and 2, the
Conventionally, a recording paper in which a magnetic material is sandwiched between two sheets of paper substrates and is bonded is used.
However, on the surface of the recording paper, projections (convex portions) are generated in the portions where the magnetic material disposed between the two sheets of paper substrates exist, and the steps caused by these convex portions are likely to occur. When an image is formed on the recording paper by, for example, an electrophotographic method, image quality defects due to defective transfer are liable to occur in the stepped portion.
Particularly, when the thickness of the entire recording paper is reduced, steps due to the convex portions are likely to occur remarkably. If an image is formed on a recording paper having a thin overall thickness, for example, an electrophotographic method, image quality defects due to transfer failure are likely to occur.
On the other hand, in the
In the
When the density of the second
Further, in the conventional recording paper sandwiched between two paper substrates of the same density, the magnetic material is contained on both sides of the two paper substrates at the same ratio. Therefore, on the recording paper, a gap may be formed at the positions on both sides of the magnetic material (positions adjacent to the magnetic material in the direction along the coplanar surface) on the coplanar surface of the two sheets of paper substrates.
On the other hand, in the
As described above, the
1 and 2, the
The
The
Here, when the ratio H (h1 / h2 or h2 / h1) of the maximum distances h1 and h2 is more than 0.9, the
The
The measurement sample is not limited to a scanning electron microscope (SEM), and may be measured using an optical microscope or a transmission electron microscope (TEM).
The density of each of the first
The difference in density between the first
The basis weight of each of the first
The basis weight of the
The thickness of the
(Second Embodiment)
3 is a cross-sectional view showing the
The
3 (B), the shortest distance a from the
The
3 (A) and 3 (B), the
When the density of the second
Further, in the conventional recording paper, which is sandwiched and interposed between two paper substrates of the same density, the magnetic material is contained on both sides of the two paper substrates in the same ratio. Therefore, on the recording paper, a gap may be formed at the positions on both sides of the magnetic material (positions adjacent to the magnetic material in the direction along the coplanar surface) on the coplanar surface of the two sheets of paper substrates.
On the other hand, the
3, the
The shortest distance a from the surface of the
The shortest distance a from the surface of the first
The measurement sample is not limited to a scanning electron microscope (SEM), and may be measured using an optical microscope or a transmission electron microscope (TEM).
The density of each of the first
The difference in density between the first
The basis weight of each of the first
The basis weight of the
The thickness of the
(Third Embodiment)
The
As described above, in the
For example, in the
When the density of the second
Further, in the conventional recording paper sandwiched between two paper substrates of the same density, the magnetic material is contained on both sides of the two paper substrates at the same ratio. For this reason, in the recording paper, a gap may be formed at positions on both sides of the magnetic material (positions adjacent to the magnetic material in the direction along the coplanar surface) on the coplanar surface of the two paper substrates.
On the other hand, the
Further, in the
The density of each of the first
The basis weight of each of the first
The basis weight of the
The thickness of the
The image forming method for the
≪ Method of producing recording paper &
(Fourth Embodiment)
Next, a manufacturing method of the
The method of manufacturing the
As described above, the difference in density between the first
For example, when the density of the second
This is because the
When the density of the second
Further, in the
Further, in the conventional recording paper sandwiched between two sheets of paper substrates of the same density, the magnetic material is contained on both sides of the two paper substrates at the same ratio. For this reason, in the recording paper, a gap may be formed at positions on both sides of the magnetic material (positions adjacent to the magnetic material in the direction along the coplanar surface) on the coplanar surface of the two paper substrates.
On the other hand, the
A method of manufacturing the
The manufacturing apparatus for manufacturing the
As shown in Fig. 4, the manufacturing apparatus for producing the
4 includes a tension roll (tension imparting rolls, hereinafter the same) 22A and 22B for imparting a tension to the first
Hereinafter, each section of the production apparatus for producing the
- Adhesive application system -
In Fig. 4, the
The
As the
The
4, the adhesive
For example, the rotational direction of the
The
- Magnetic material placement device -
The magnetic
4, the magnetic
The magnetic
In Fig. 4, the
- Fusion device -
The fusing
4 is provided with a pair of pressurizing
The heating temperature of the pressurizing rolls 52A and 52B is not particularly limited. For example, the
The joining
For example, the
Further, for example, the knocking
In addition, for example, the knocking
In the above description, the manufacturing apparatus for producing the
That is, the manufacturing apparatus for producing the
4 shows an apparatus for applying the adhesive 16 to the lower surface side of the
4 shows a configuration in which the
4 shows a configuration in which the adhesive
4 shows a device for joining a roll-shaped first
Further, for example, a dryer (not shown) may be provided on the downstream side of the knocking
Next, the manufacturing process (operation) of the
· Magnetic material placement process
First, a
Next, the first
· Integration process
The first
When a dryer (not shown) is provided on the downstream side of the kneading
In addition, the manufacturing method has been described by exemplifying the manufacturing apparatus shown in Fig. 4, but the present invention is not limited to this. For example, each of the steps of arranging the
Through the above process, the
The
For example, surface treatment with a surface sizing liquid and coating treatment in which a pigment coating layer (coating layer) is provided may be performed. Further, post-processing for laminating the resin film may be performed.
Further, various functions may be given to at least one of the first
Further, the obtained
Hereinafter, each element common to the
(The first paper base material and the second paper base material)
The first paper base material and the second paper base material are composed of pulp fibers and, if necessary, other additives such as fillers.
The pulp fiber will be explained. As the pulp fiber, known pulp fibers may be mentioned. Specific examples thereof include bleached hardwood bleached kraft pulp, hardwood bleached kraft pulp, softwood bleached kraft pulp, softwood bleached kraft pulp, hardwood bleached sulfite pulp, hardwood unbleached sulfite pulp, softwood bleached sulfite pulp, Pulp fibers of non-wood pulp such as pulp fibers of wood pulp such as wood pulp, kenaf pulp, bergas pulp, bamboo pulp, cotton pulp, Mab pulp, straw pulp (rice straw, straw), reed pulp, Pulp fibers of waste paper pulp obtained by deinking or bleaching waste paper raw materials.
It is also possible to use, for example, a wood pulp made by mechanically pulverizing a wood or a chip, a chemical mechanical pulp mechanically pulped after impregnating the wood or chips with the chemical liquid, and a chemical mechanical pulp after the chip is softened, Thermomechanical pulp pulverized by pulp, pulp fibers of a mechanical pulp such as a chemical thermomechanical pulp pulverized by a refiner after being impregnated with a chemical liquid in a wood or a chip and then heated by steam.
The pulp fibers may be used alone or in combination of two or more.
In addition, synthetic fibers such as synthetic pulp, rayon, and the like, and synthetic fibers such as polyester and nylon may be contained, if necessary, in the form of a pulp synthetic polymer material such as polyethylene or polypropylene.
Of these, pulp fibers of wood pulp are preferably used. The pulp fibers of softwood pulp (for example, softwood bleached kraft pulp, softwood bleached kraft pulp, softwood bleached sulfite pulp, softwood bleached sulfite pulp, ) And pulp fibers of a hardwood pulp (for example, hardwood bleached kraft pulp, hardwood non-bleached kraft pulp, hardwood bleached sulfite pulp, hardwood unbleached sulphite pulp, and hardwood water mechanical pulp). By using such pulp fibers, the strength and smoothness of the paper as a recording paper can be easily obtained.
The mixing ratio of the hardwood pulp to the softwood pulp is preferably in the range of, for example, softwood pulp: hardwood pulp = 95: 5 or more and 0: 100 or less from the viewpoint of strength and smoothness of the paper as the recording paper.
The pulp fiber may be used alone as pulp fiber of virgin pulp or may be used together with pulp fiber of pulp pulp as necessary.
In particular, virgin pulp is a method of bleaching by using mainly chlorine dioxide (Elemental Chlorine Free (ECF) without using chlorine gas or using ozone / hydrogen peroxide without using any chlorine compound (Total Chloline Free, TCF).
In addition, as a raw material of waste paper pulp, it is possible to use as a raw material for cutting pulp, paper cutting, trimmed upper white, special white, whitish white, white lacquer, etc. occurring in bookbinding, Unprinted paper; High-quality printing waste paper such as coated paper or coated paper which has been printed or copied; Abolished newspapers such as water-based inks, oil-based inks, pencil-written waste paper, printed high-quality paper, high-quality coated paper, heavy paper, heavy paper coated paper, and heavy paper coated paper.
As the pulp pulp, it is preferable that the pulp raw material is subjected to deinking treatment, cleaning treatment, and the like, and further treated with at least one of ozone bleaching treatment and hydrogen peroxide bleaching treatment. Further, in order to obtain a base paper having higher whiteness, it is preferable that the blending ratio of pulp pulp obtained by the bleaching treatment is 50% by mass or more and 100% by mass or less. From the viewpoint of resource reuse, it is more preferable that the compounding ratio of pulp pulp is 70 mass% or more and 100 mass% or less.
Next, fillers and other additives will be described. Examples of the filler include inorganic fillers such as heavy calcium carbonate, light calcium carbonate, chalk, calcined clay, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, aluminum silicate, calcium silicate, White inorganic pigments such as synthetic silica, aluminum hydroxide, alumina, sericite, white carbon, saponite, calcium montmorillonite, sodium montmorillonite and bentonite; and organic pigments such as acrylic plastic pigments, polyethylene and urea resins. Further, in the case of compounding the waste paper, it is preferable to estimate the ash content contained in the paper raw material in advance and adjust the amount of the filler to be added.
Examples of other additives include sizing agents of known internal or external additives used for ordinary paper, and paper strengthening agents of internal or external additives. It is preferable to add an internal sizing agent to the first paper base material and the second paper base material. Examples of the internal sizing agent include a so-called neutral rosin sizing agent, an alkenyl succinic acid (ASA) type, an alkyl ketene dimer (AKD) type , Petroleum resin based filler sizing agents. Further, the first paper base material and the second paper base material may be externally coated with an external sizing agent if necessary. Examples of the external sizing agent include an external sizing agent such as an alkylketene dimer system, a styrene-acrylic acid copolymer system, and a styrene-maleic acid copolymer system.
When the surfaces of the first paper substrate and the second paper substrate are adjusted to be cationic, for example, a hydrophilic cationic resin or the like may be treated on the surface.
In order to suppress penetration of the cationic resin into the inside of the first paper base material and the second paper base material, the size of each paper base material before applying the cationic resin is preferably 10 seconds or more and less than 60 seconds.
The first paper base material and the second paper base material may be internally or externally adhered to a known paper strength enhancer used for ordinary paper, if necessary. Examples of the glutamate enhancer include starch, modified starch, dialdehyde starch, gum, carboxymethylcellulose, polyvinyl alcohol, polyacrylamide, urea-formaldehyde resin, melamine-formaldehyde resin, polyethyleneimine, epoxidized polyamide , Polyamide · epichlorohydrin resin, methylol polyamide, chitosan derivative and the like.
The first paper base material and the second paper base material may further contain a fixing agent for fixing these additives, such as a dye, a pH adjuster, etc., a defoaming agent, a slime control agent, a pitch control agent, a yield improving agent, Various auxiliaries to be compounded in ordinary paper napping may be added.
The surface treatment of the first paper base material and the second paper base material may be carried out on one or both sides of the surface of the first paper base material and the second paper base material by coating the surface sizing liquid as required. Further, a coating solution in which a pigment coating layer is formed by applying a coating solution for forming a pigment coating layer may be coated.
The coating solution for the surface sizing liquid and the coating liquid for forming the pigment coating layer may be applied by any of various methods such as a size press coating, a core size coating, a gate roll coating, a roll coating, a bar coating, an air knife coating, Blade coating, curtain coating, or the like.
Examples of the surface-sizing liquid include an above-mentioned strength-increasing agent for external addition, and an external sizing agent. In addition, additives such as a dimension stabilizer, an inorganic conductive agent, an organic conductive agent, a surfactant, a pigment, a dye, and a cationic resin may, for example, be mentioned. The surface-sizing solution may be used alone or in combination of two or more.
The coating liquid for forming a pigment coating layer contains a pigment, an adhesive for adhering the pigment and, if necessary, other additives. As the pigment, a pigment used in conventional pigment-coated paper is used. Concretely, there may be mentioned, for example, heavy calcium carbonate, light calcium carbonate, titanium dioxide, aluminum hydroxide, satin white, talc, calcium sulfate, barium sulfate, zinc oxide, magnesium oxide, magnesium carbonate, amorphous silica, colloidal silica, A mineral pigment such as kaolin, calcined kaolin, dilaminated clay, aluminosilicate, sericite, bentonite and smectite, polystyrene resin particles, urea-formaldehyde resin particles, hollow particles and other organic pigments, But a plurality of these may be used in combination.
Examples of the adhesive for adhering the pigment used in the coating liquid for forming the pigment coating layer include synthetic adhesives and natural adhesives. Specific examples of the synthetic adhesive include various copolymers such as styrene · butadiene, styrene · acrylic, ethylene · vinyl acetate, butadiene · methyl methacrylate, and vinyl acetate · butyl acrylate, and polyvinyl alcohol, A copolymer of acrylic acid and methyl methacrylate, and the like. One or more of these synthetic adhesives may be used depending on the purpose.
Examples of natural adhesives include oxidized starch, esterified starch, enzyme modified starch, and commonly known adhesives such as cold water soluble starch, casein and soybean protein obtained by flash drying them.
These adhesives are preferably used in an amount of 5% by mass or more and 50% by mass or less, preferably 10% by mass or more and 30% by mass or less, per 100% by mass of the pigment.
If necessary, various auxiliaries incorporated in conventional coated paper such as a dispersing agent, a thickener, a water-retaining agent, a defoaming agent, and a water-proofing agent may be used.
It is preferable that the coated paper on which the pigment coating layer is formed is subjected to a smoothing treatment by a commonly used smoothing device (for example, a super calender, a machine calender, a soft calender, etc.).
The first paper base material and the second paper base material are subjected to post-processing such as adhesive processing, magnetic processing, flame-retarding processing, heat-resistant processing, water-proofing processing, oil-refining processing, .
- first paper base material and method of producing second paper base material -
The first paper base material and the second paper base material can be obtained, for example, by using a pulp slurry containing pulp fibers and, if necessary, additives, in a paper machine, dewatering in a wire portion, pressing in a press portion, ), And a process such as drying in a dryer unit, thereby obtaining a roll-shaped or sheet-shaped paper substrate. In addition, a smoothing process such as calendering may be performed if necessary.
The density of the first paper substrate and the second paper substrate may be adjusted by a known method. For example, in addition to the adjustment of the pulp fibers and the additive, the pressure may be adjusted by the pressure at the start portion (press portion) of the paper machine, the pressure of the smoothing device (calendar, etc.), and the like. When at least one of the first paper substrate and the second paper substrate is a coated paper on which the pigment coating layer is formed, it may be adjusted by the pressure of the smoothing device after formation of the pigment coating layer.
Examples of the paper machine for irritating the first paper substrate and the second paper substrate include a paper making method such as a long net method, a twin wire method, a twin wire method (for example, an on-top twin wire, a gap former) A known paper machine using a paper machine.
The papermaking method for obtaining the first paper substrate and the second paper substrate may be any of an acidic papermaking method and a neutral papermaking method. However, for example, when calcium carbonate is mainly used as a filler, it is preferable to employ a neutral papermaking method.
In addition, a paper machine for irritating the first paper substrate and the second paper substrate may be a known multilayer paper machine. Multilayer paper machines are, for example, a multi-cylinder system, a long-haul network system, a long-distance network system, a multi-headbox system, a short-haul network system, There is a paper machine.
If necessary, a smoothing process is performed using an on-machine or an off-machine smoothing device such as a super calender, a gloss calender, or a soft calender to obtain a roll-shaped or sheet-shaped paper. When the smoothing process is performed, the pressure of the calenders and the notices (paper passing) are adjusted and adjusted to a predetermined density to prepare as the first paper substrate and the second paper substrate. However, either the first paper substrate or the second paper substrate is adjusted so as to have a lower density.
In the case of applying a coating liquid for coating a surface sizing liquid or coating a coating liquid for forming a pigment coating layer on at least one of the first paper base material and the second paper base material, Coating by a commonly used coating method such as size coating, gate roll coating, roll coating, bar coating, air knife coating, rod blade coating, blade coating and curtain coating.
(Magnetic material)
It is preferable that the magnetic material is made of a magnetic material having characteristics that cause a large-scale Barkhausen effect. The magnetic properties, composition and shape of the magnetic material are not particularly limited.
However, as the magnetic property of the magnetic material, it is preferable that the hysteresis loop is rectangular and the holding force (Hc) is relatively small.
Examples of the composition of the magnetic material include alloys containing magnetic elements (for example, Co, Fe, and Ni), transition metals and glass forming elements (for example, Si, B, C and P) Co-B-Si, Co-Fe-B-Si, and the like), and the composition ratio of the constituent elements and the production method Are selected so as to have various magnetic properties. Further, the color of the amorphous alloy composed of the above elements is not significantly influenced by the ratio of the elements.
The shape of the magnetic material is not particularly limited as long as it is a shape suitable for causing the DABARKHAUS effect. However, in order to produce the DABARKHAUS effect, a length is required for the cross-sectional area. Therefore, it is preferable that it is linear (wire-shaped).
The linear shape (wire shape) means a cross-sectional shape (a shape cut along the cross direction with respect to the longitudinal direction of the magnetic material), and a circle shape, an ellipse shape, a rectangular shape, Lt; RTI ID = 0.0 > extended < / RTI > That is, the linear shape (wire shape) is a concept including a shape of a so-called band shape (ribbon shape) having a short length in the thickness (height) direction with respect to the length in the width direction.
It is preferable that the magnetic material has an outer diameter of 10 mu m or more in order for the magnetic material to have the Darwarkhausen effect. Therefore, when the magnetic material is contained in, for example, a recording paper having a thickness of 60 μm or more and 130 μm or less, the magnetic material has an outer diameter of 10 μm or more and 60 μm or less (preferably 15 Mu m or more and 55 mu m or less, and more preferably 15 mu m or more and 35 mu m or less). On the other hand, the length of the magnetic material depends on the outer diameter. For example, when the outer diameter is 10 μm or more and 60 μm or less, the length of the magnetic material is 10 μm or more and 40 mm or less (preferably 10 mm or more and 30 mm or less, Mm or less).
The magnetic material is obtained, for example, by melting a magnetic material, passing it through a discharge port having a shape corresponding to a predetermined cross-sectional shape, and then cooling it. Concretely, for example, a so-called single-layer method in which a thin band is obtained by supplying a molten alloy onto a manufacturing method (Taylor-Ulitovsky method) described in the specification of US Pat. No. 3,256,584 or on a single high- Roll method in which molten metal is supplied between a roll method and a pair of cooling rolls rotating at a high speed to obtain a thin band.
The amount in which the magnetic material is disposed is, for example, not less than 1 and not more than 50 (preferably not less than 3 but not more than 40, and more preferably not less than 5 but not more than 30) per sheet of the
Examples of the adhesive for bonding the first paper base material and the second paper base material include known adhesives such as an aqueous adhesive, a solvent based adhesive and an emulsion based adhesive. Specific examples include starch, modified starch, PVA (polyvinyl alcohol), carboxymethylcellulose, urethane resin, polyester resin, epoxy resin, natural or synthetic rubber, cyanoacrylate, vinyl acetate resin, ethylene- A vinyl acetate copolymer, and an acrylic resin.
[Example]
EXAMPLES Hereinafter, examples will be described, but the present invention is not limited to these examples. In the following description, " part " and "% " are all based on mass unless otherwise specified.
[evaluation]
Each of the recording papers was produced by each of Examples and Comparative Examples described later, and the following evaluation was made using the recording papers obtained in each example.
- Image evaluation -
Image evaluation was performed in each of the Examples and Comparative Examples.
An image (three-
-Evaluation standard-
A (∘): No change in density is observed in the image patch
B (?): Slight change in density is observed in the image patch (no problem)
C (×): Change in density is observed in the image patch
- maximum distance h1 and maximum distance h2-
In each of the examples and comparative examples, the maximum distance h1 from the concave surface of the first paper base material and the second paper base material to the magnetic material entering the surface side of the first paper base material, The maximum distance h2 to the magnetic material entering the surface side of the paper base material, and the ratio H thereof were measured by a technique (described).
- the shortest distance a and the shortest distance b-
The shortest distance a from the surface of the first paper base material to the magnetic material, the shortest distance b from the surface of the second paper base material to the magnetic material, and the ratio c thereof are shown in One way.
- Weight, density -
JIS P 8124 (2011), and JIS P 8118 (2014).
≪ Example 1-1 >
85 parts by weight of LBKP (hardwood bleached kraft pulp, fineness (CSF) = 420 ml) and 15 parts by weight of NBKP (softwood bleached kraft pulp, fineness (CSF) = 440 ml) were added to a pulp slurry 0.7 parts by mass of a polyacrylamide resin (trade name: Polystron 117, Arakawa Chemical Industries, Ltd.), 10 parts by mass of calcium carbonate (trade name: Billiant-15, Shiroishi Kogyo Co.) as a filler, : Size pine SA-864, Arakawa Chemical Industries Co., Ltd.) were added, and the mixture was diluted with white water to prepare a stock (paper stock) having a pH value of 6.5 and a solid content concentration of 0.4%.
This material was ground using an Orientated Sheet Former (trade name: ORIENTED SHEET FORMER, manufactured by Kumagai Riki Kogyo Co., Ltd.), and then a square sheet machine press (Kumagai Riki Kogyo Co., Ltd.), a rotary dryer (trade name: ROTARY DRYER DR (Base weight: 42 g / m 2, density: 0.80 g / cm 3) as the first paper substrate, and the second paper base material (second paper base) Substrate (1B-1) (basis weight 44 g / m 2, density 0.43 g / cm 3) was obtained as a paper substrate.
A magnetic material (composition: Fe-Si-B,
≪ Example 1-2 >
(1B-2) (basis weight: 44 g / m 2, density: 0.63 g / cm 3) as a second paper substrate was prepared by the same method as in Example 1-1 except that the paper slurry was ground by a similar method, , A recording paper (basis weight: 86 g / m 2) was obtained in the same manner as in Example 1-1.
≪ Example 1-3 >
(1B-3) (basis weight: 40 g / m 2, density: 0.55 g / cm 3) as a second paper substrate was prepared by the same method as in Example 1-1 except that the paper slurry was ground by the same method, (Basis weight: 82 g / m 2) was obtained in the same manner as in Example 1-1.
≪ Example 1-4 >
The foundation slurry prepared in Example 1-1 was ground in the same manner and the density was adjusted by calendering to obtain a base material 1A-2 (base weight 32 g / m 2, density 0.85 g / cm 3) as the first paper base material (Basis weight: 65 g / m 2) was obtained in the same manner as in Example 1-1 except that the base paper (1B-4) (basis weight: 33 g / m 2, density: 0.61 g /
≪ Example 1-5 >
The foundation slurry prepared in Example 1-1 was grassed by the same method and the density was adjusted by calendering to obtain a base paper 1A-3 (basis weight 25 g / m 2, density 0.90 g / cm 3) as the first paper substrate (Basis weight: 60 g / m < 2 >) was obtained in the same manner as in Example 1-1, except that the substrate (1B-5) (basis weight 35 g / m 2, density 0.50 g /
≪ Comparative Example 1-1 >
As the second paper base material, the base material 1A-1, which is the same material as the first paper base material, was prepared.
(Composition: Fe-Si-B,
[Table 1]
From the above results, it can be seen that in this embodiment, "image evaluation" is better than the comparative example. As a result, it can be seen that the occurrence of a step on the surface of the recording paper is suppressed.
≪ Example 2-1 >
85 parts by weight of LBKP (hardwood bleached kraft pulp, fineness (CSF) = 420 ml) and 15 parts by weight of NBKP (softwood bleached kraft pulp, fineness (CSF) = 440 ml) were added to a pulp slurry 0.7 parts by mass of a polyacrylamide resin (trade name: Polystron 117, Arakawa Chemical Industries, Ltd.), 10 parts by mass of calcium carbonate (trade name: Billiant-15, Shiroishi Kogyo Co.) as a filler, : Size pine SA-864, Arakawa Chemical Industries, Ltd.) were added and the mixture was diluted with distilled water to prepare a fineness having a pH value of 6.5 and a solid content concentration of 0.4%.
This material was ground using an Orientated Sheet Former (trade name: ORIENTED SHEET FORMER, Kumagai Riki Kogyo Co., Ltd.), and was fed into a square sheet machine press (Kumagai Riki Kogyo Co., Ltd.), a rotary dryer (trade name: ROTARY DRYER DR- (Basis weight: 42 g / m 2, density: 0.77 g / cm 3) as the first paper base material and the base material (2 g) as the second paper base material (2B-1) (basis weight 44 g / m 2, density 0.43 g / cm 3).
A magnetic material (composition: Fe-Si-B,
≪ Example 2-2 >
(2B-2) (basis weight: 44 g / m 2, density: 0.63 g / cm 3) as a second paper substrate was prepared by the same method as in Example 2-1 using paper slurry prepared in the same manner and density adjustment by calendering , A recording paper (basis weight: 86 g / m 2) was obtained in the same manner as in Example 2-1.
≪ Example 2-3 >
(2B-3) (basis weight: 40 g / m 2, density: 0.55 g / cm 3) as a second paper substrate was prepared by the same method as in Example 2-1 except that the paper slurry was ground by the same method and calendered by calendering (Basis weight: 82 g / m 2) was obtained in the same manner as in Example 2-1.
<Example 2-4>
(2B-4) (basis weight: 38 g / m 2, density: 0.71 g / cm 3) as a second paper substrate was prepared by the same method as in Example 2-1 except that the paper slurry was ground by the same method and calendered by calendering , A recording paper (basis weight 80 g / m 2) was obtained in the same manner as in Example 2-1.
<Example 2-5>
(2B-5) (basis weight: 48 g / m 2, density: 0.34 g / cm 3) as the second paper substrate was subjected to the same calendering using the calender slurry prepared in Example 2-1 (Basis weight: 90 g / m 2) was obtained in the same manner as in Example 2-1.
≪ Comparative Example 2-1 >
The paper slurry prepared in Example 2-1 was ground in the same manner and the density was adjusted by calendering to obtain a first paper base material and a second paper base material 2A-2 (basis weight: 27 g / m 2, density 0.85 g / cm 3) was obtained in the same manner as in Example 2-1.
[Table 2]
From the above results, it can be seen that in this embodiment, "image evaluation" is better than the comparative example. As a result, it can be seen that the occurrence of a step on the surface of the recording paper is suppressed.
10A: first
12: magnetic material 14: coplanar surface
16: Adhesive 30: Adhesive application device
40: magnetic material arranging device 50:
100: Recording paper
Claims (7)
A second paper base material which is bonded to the first paper base material,
And a magnetic material disposed between the first paper substrate and the second paper substrate,
Wherein the magnetic material has a large ratio of entering the one side of the first paper base or the second paper base with respect to the concave surface of the first paper base and the second paper base.
The shortest distance a from the surface of the first paper base material to the magnetic material, and the shortest distance b from the surface of the second paper base material to the magnetic material, the shortest distance a and the shortest distance b, the value c obtained by dividing the one having the smallest shortest distance by the one having the shortestest distance is 0.5? c? 0.9.
And the density of the first paper base material and the second paper base material is 0.4 g / cm3 or more and 1.0 g / cm3 or less, respectively.
A second paper base material bonded to the first paper base material,
And a magnetic material disposed between the first paper substrate and the second paper substrate,
Wherein a difference in density between the first paper base material and the second paper base material is 0.1 g / cm 3 or more and 0.4 g / cm 3 or less.
And the density of the first paper base material and the second paper base material is 0.4 g / cm3 or more and 1.0 g / cm3 or less, respectively.
And a bonding step of bonding the other paper base material to one of the paper base materials on which the magnetic material is disposed so as to sandwich the magnetic material therebetween,
Wherein a difference in density between the first paper base material and the second paper base material is not less than 0.1 g / cm 3 and not more than 0.4 g / cm 3.
Wherein the density of the first paper base material and the second paper base material is 0.4 g / cm 3 or more and 1.0 g / cm 3 or less, respectively.
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| JP2015104737A JP6596923B2 (en) | 2015-05-22 | 2015-05-22 | Recording paper and recording paper manufacturing method |
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| KR101970166B1 KR101970166B1 (en) | 2019-04-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005232617A (en) | 2004-02-19 | 2005-09-02 | Dainippon Printing Co Ltd | Magnetic substance-containing paper and method for reading the same |
| US20070178260A1 (en) * | 2006-01-27 | 2007-08-02 | Avery Levy | Paper having discrete regions of ferromagnetic material and process of making the same |
| KR100884090B1 (en) * | 2007-06-08 | 2009-02-19 | 주식회사 코레이트 | Paper for preventing outflow of document and Method for manufacturing thereof |
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| JP3331938B2 (en) * | 1997-12-25 | 2002-10-07 | 凸版印刷株式会社 | Paper with anti-counterfeit measures and method of manufacturing the same |
| JP4268258B2 (en) * | 1999-04-05 | 2009-05-27 | 大日本印刷株式会社 | Anti-counterfeit paper |
| BRPI0915031A2 (en) * | 2008-06-12 | 2015-10-27 | Crane & Co Inc | method for increasing adhesion between a security member and a fibrous sheet material |
| JP5799566B2 (en) * | 2011-04-26 | 2015-10-28 | 富士ゼロックス株式会社 | Paper |
| JP5790140B2 (en) * | 2011-05-13 | 2015-10-07 | 大日本印刷株式会社 | Booklet security paper, manufacturing method thereof, and passport |
| CN102296486B (en) * | 2011-08-22 | 2014-10-15 | 保定钞票纸业有限公司 | False-proof safety strip and false-proof paper applying it |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005232617A (en) | 2004-02-19 | 2005-09-02 | Dainippon Printing Co Ltd | Magnetic substance-containing paper and method for reading the same |
| US20070178260A1 (en) * | 2006-01-27 | 2007-08-02 | Avery Levy | Paper having discrete regions of ferromagnetic material and process of making the same |
| KR100884090B1 (en) * | 2007-06-08 | 2009-02-19 | 주식회사 코레이트 | Paper for preventing outflow of document and Method for manufacturing thereof |
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| CN106168007B (en) | 2018-07-03 |
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| JP2016215543A (en) | 2016-12-22 |
| JP6596923B2 (en) | 2019-10-30 |
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