KR20160137317A - Recording paper and method for manufacturing the same - Google Patents

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

RECORDING PAPER AND METHOD FOR MANUFACTURING THE SAME [0002]

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 "

Japanese Patent Application Laid-Open No. 2005-232617

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 recording paper 100 of the first embodiment. 2 is a cross-sectional view showing the recording paper 100 of the first embodiment. 2 is a sectional view taken on line A-A of Fig.

(First Embodiment)

1 and 2, the recording paper 100 of the first embodiment is formed by bonding a first paper base material 10A and a second paper base material 10B via an adhesive (not shown). The magnetic material 12 is arranged so as to be sandwiched between the first paper base material 10A and the second paper base material 10B. In the recording paper 100, the magnetic material 12 is sandwiched between the second paper base material 10B and the second paper base material 10B with respect to the concave surface of the first paper base 10A and the second paper base 10B, 10B side of the first and second guide grooves 10, 10 are increased.

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 recording paper 100 of the first embodiment, as described above, the magnetic material 12 is applied to the concave surface 14 of the first paper base 10A and the second paper base 10B , And the second paper base material 10B side is formed so as to enter more than the first paper base material 10A side.

In the recording paper 100, a first paper base material 10A and a second paper base material 10B having a density lower than that of the first paper base material 10A are bonded. Therefore, the recording paper 100 after the first paper base material 10A and the second paper base material 10B are joined together is a recording paper 100 in which the magnetic material 12 is sandwiched between the second paper base 10B ) Side. Since the magnetic material 12 is arranged so as to enter the second paper substrate 10B side more than the first paper substrate 10A side, the surface of the recording paper 100 in the portion where the magnetic material 12 is disposed The occurrence of a step is suppressed. Further, according to the above configuration, even if the entire thickness of the recording paper 100 is made thin, the occurrence of the step can be suppressed easily. For example, when an image is formed on the recording paper 100 of the first embodiment by the electrophotographic method, generation of a level difference is suppressed on the surface of the recording paper 100, .

When the density of the second paper base material 10B is higher than the density of the first paper base material 10A, the magnetic material 12 is harder than the second paper base material 10B on the first paper base 10A side I get a lot of it.

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 recording paper 100 of the first embodiment, a large amount of the magnetic material 12 is contained in the second paper base 10B side which is lower in density than the first paper base 10A side. Since the second paper base material 10B having a lower density is more flexible than the first paper base material 10A, the second paper base material 10B is deformed, So that it is more likely to be planted. Therefore, it is considered that the recording paper 100 is arranged on both sides of the magnetic material 12 on the coplanar surface 14 without creating a gap.

As described above, the recording paper 100 of the first embodiment has the above-described structure. The recording paper 100 of the first embodiment can be formed on the first paper substrate 10A side and the second paper substrate 10B side of the recording paper 100, The occurrence of a step on both sides is suppressed. On the other hand, in the recording paper 100, the magnetic material 12 is bonded to the concave surface 14 of the first paper base material 10A and the second paper base material 10B with respect to the first paper base material 10A side It is believed that the second paper sheet 10B contains more paper on the side of the first paper substrate 10A, and the occurrence of the step is more suppressed on the surface of the first paper substrate 10A side. Therefore, when an image is formed by, for example, an electrophotographic method, the surface of the first paper base material 10A on which the magnetic material 12 is contained is likely to be more suppressed from occurrence of image quality defects due to defective transfer or the like do.

1 and 2, the recording paper 100 of the first embodiment contains a large amount of the magnetic material 12 on the second paper substrate 10B side. The distance from the magnetic material 12 to the surface of the recording paper 100 is smaller than the distance from the side of the second paper substrate 10B to the surface of the recording paper 100. On the other hand, And the side of the substrate 10A side is secured. Therefore, it is considered that the surface of the recording paper 100 on the side of the first paper base 10A is less likely to deteriorate excessively than the surface on the side of the second paper base 10B. For example, when an image is formed by the electrophotographic method, occurrence of transfer failure, which is thought to be caused by a decrease in electric resistance value on the surface of the recording paper 100, particularly on the first paper substrate 10A side, It is presumed that it will be more suppressed.

The magnetic material 12 is formed on the recording paper 100 of the first embodiment in such a manner that the first paper base material 10A and the second paper base material 10B are bonded to the first paper base 10A (The recording paper 100 shown in Figs. 1 and 2) that enters the side of the second paper base 10B rather than the side of the first paper base 10A Ratio), it is preferable that the following conditions are satisfied, for example.

The magnetic material 12 which has entered from the concave surface 14 toward the front surface side of the first paper substrate 10A (the surface on the first paper substrate 10A side on the surface of the recording paper 100) Of the second paper base 10B toward the surface side of the second paper base 10B (the surface of the recording paper 100 on the side of the second paper base 10B) from the joining face 14 (I.e., h1 / h2 or h2 / h1) of a value obtained by dividing the smaller one of h1 and h2 by the larger one is 0.55 or more and 0.85 (inclusive) when h2 is the maximum distance of the magnetic material 12 Or less, more preferably 0.60 or more and 0.80 or less. In this range, the surface of the recording paper 100 is easily suppressed from generating a step. In addition, the maximum distances h1 and h2 represent the maximum length among the lengths (along the thickness direction) of the outer peripheral surface of the concave surface 14 and the magnetic material 12.

Here, when the ratio H (h1 / h2 or h2 / h1) of the maximum distances h1 and h2 is more than 0.9, the magnetic material 12 is disposed between the first paper substrate 10A and the second paper substrate 10B in the same ratio in both the first paper base material 10A and the second paper base material 10B with respect to the concave surface 14 of the first paper base 10A.

The magnetic material 12 is applied to the first paper substrate 10A or the second paper substrate 10B on one side of the first paper substrate 10A or the second paper substrate 10B with respect to the coplanar surface 14 of the second paper substrate 10B Is observed and measured by, for example, the following operation. First, the recording paper 100 is cut by a known method (for example, a resin impregnation method, a cutting method, a frozen division method, or the like) to prepare a measurement sample in which the end face of the recording paper 100 is exposed. Then, the measurement sample is observed and measured by, for example, image processing software standardly equipped with a VE SEM of KEYENCE SHOJI. Observation and measurement are performed by observing and measuring at 10 places where the magnetic material 12 exists in the section of the measurement sample. h1, h2, and the ratio H thereof are obtained as an average value of 10 places.

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 paper base material 10A and the second paper base material 10B constituting the recording paper 100 of the first embodiment is preferably from 0.4 g / cm3 to 1.0 g / . More preferably 0.4 g / cm 3 or more and 0.9 g / cm 3 or less. When the density of each of the first paper base material 10A and the second paper base material 10B is within this range, the strength of the paper as the recording paper 100 is maintained, The occurrence of the step difference due to the magnetic material 12 disposed between the first paper substrate 10A and the second paper substrate 10B can be further suppressed.

The difference in density between the first paper base material 10A and the second paper base material 10B is preferably in the range of 0.1 g / cm3 or more and 0.4 g / cm3 or less in view of suppressing the generation of the step. More preferably 0.15 g / cm3 or more and 0.4 g / cm3 or less, and still more preferably 0.2 g / cm3 or more and 0.4 g / cm3 or less.

The basis weight of each of the first paper base material 10A and the second paper base material 10B is preferably 25 g / m 2 or more and 60 g / m 2 or less as basis weight before the fusion, and is preferably 30 g / m 2 or more and 50 g / desirable.

The basis weight of the entire recording paper 100 is preferably from 50 g / m 2 to 100 g / m 2, more preferably from 52 g / m 2 to 95 g / m 2, and further preferably from 54 g / m 2 to 90 g / m 2.

The thickness of the entire recording paper 100 is preferably 60 占 퐉 or more and 130 占 퐉 or less, more preferably 65 占 퐉 or more and 120 占 퐉 or less, and more preferably 70 占 퐉 or more and 100 占 퐉 or less.

(Second Embodiment)

3 is a cross-sectional view showing the recording paper 100 of the second embodiment. The recording paper 100 of the second embodiment is arranged such that the magnetic material 12 satisfies the following relationship. 3, from the surface of the first paper base 10A (that is, the surface of the first paper base 10A side on the surface of the recording paper 100), the first paper base 10A Of the surface of the recording paper 100) and the magnetic material 12 disposed between the second paper base 10B and the surface of the second paper base 10B (The surface on the side of the base material 10B) to the magnetic material 12, the value c, which is obtained by dividing the shortest distance a by the shortest distance among the shortest distance a and the shortest distance b, c &lt; / = 0.9. The value of c is preferably 0.55? c? 0.85, more preferably 0.6? c? 0.8.

The recording paper 100 shown in Fig. 3 (A) is a recording paper 100 in which the shortest distance a from the first paper base 10A to the magnetic material 12 is smaller than the shortest distance a from the second paper base 10B to the magnetic material 12 Which is larger than the shortest distance b. In this case, a value c obtained by dividing the shortest distance b from the second paper base 10B to the magnetic material 12 by the shortest distance a from the first paper base 10A to the magnetic material 12 is 0.5? C ( the magnetic material 12 is disposed between the first paper base material 10A and the second paper base material 10B so as to satisfy the following relationship: b / a = 0.9.

3 (B), the shortest distance a from the first paper base 10A to the magnetic material 12 is smaller than the shortest distance a from the second paper base 10B to the magnetic material 12, Is shorter than the shortest distance to the shortest distance &quot; b &quot; In this case, a value c obtained by dividing the shortest distance a from the first paper base 10A to the magnetic material 12 by the shortest distance b from the second paper base 10B to the magnetic material 12 is 0.5? C ( the magnetic material 12 is disposed between the first paper base material 10A and the second paper base material 10B so as to satisfy the following relationship:? a / b =? 0.9.

The recording paper 100 of the second embodiment is formed by stacking a first paper base 10A and a second paper base 10B having a density lower than that of the first paper base 10A. Therefore, the recording paper 100 after the first paper base material 10A and the second paper base material 10B are joined together is a recording paper 100 in which the magnetic material 12 is sandwiched between the second paper base 10B ) Side.

3 (A) and 3 (B), the magnetic material 12 is sandwiched between the first paper base material 10A and the second paper base material 10B by the above-mentioned 0.5? C (= a / b or b / a) &amp;le; 0.9. This configuration makes it easier to suppress the occurrence of a step on the surface of the recording paper 100 in the portion where the magnetic material 12 is disposed. Further, according to the configuration of the recording paper 100 of the second embodiment, the occurrence of steps is suppressed even when the entire thickness of the recording paper 100 is reduced. Particularly, when the thicknesses of the first paper base material 10A and the second paper base material 10B are the same, the occurrence of step differences is more likely to be suppressed. For example, when an image is formed on the recording paper 100 of the second embodiment by the electrophotographic method, generation of a step is suppressed on the surface of the recording paper 100, so that image quality defects .

When the density of the second paper base material 10B is higher than the density of the first paper base material 10A, the magnetic material 12 is harder than the second paper base material 10B on the first paper base 10A side I get a lot of it.

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 recording paper 100 of the second embodiment contains a large amount of the magnetic material 12 on the side of the second paper substrate 10B having a density lower than that of the first paper substrate 10A. Since the second paper base material 10B having a lower density is more flexible than the first paper base material 10A, the second paper base material 10B is deformed, So that it is more likely to be planted. Therefore, it is considered that the recording paper 100 is arranged on both sides of the magnetic material 12 on the coplanar surface 14 without creating a gap.

3, the recording paper 100 of the second embodiment contains a large amount of the magnetic material 12 on the second paper substrate 10B side. The distance from the magnetic material 12 to the surface of the recording paper 100 is smaller than the distance from the side of the second paper substrate 10B to the surface of the recording paper 100. On the other hand, And the side of the substrate 10A side is secured. Therefore, it is considered that the surface of the recording paper 100 on the side of the first paper base 10A is less likely to deteriorate excessively than the surface on the side of the second paper base 10B. For example, when an image is formed by the electrophotographic method, occurrence of transfer failure, which is thought to be caused by a decrease in electric resistance value on the surface of the recording paper 100, particularly on the first paper substrate 10A side, It is presumed that it will be more suppressed.

The shortest distance a from the surface of the first paper substrate 10A to the magnetic material 12 and the shortest distance b from the surface of the second paper substrate 10B to the magnetic material 12 are suppressed , It is preferably in the range of 10 mu m or more and 60 mu m or less, more preferably 20 mu m or more and 50 mu m or less.

The shortest distance a from the surface of the first paper base material 10A to the magnetic material 12 and the shortest distance b from the surface of the second paper base material 10B to the magnetic material 12 can be measured, . First, the recording paper 100 is cut by a known method (for example, a resin impregnation method, a cutting method, a frozen division method, or the like) to prepare a measurement sample in which the end face of the recording paper 100 is exposed. Then, the measurement sample is observed and measured by, for example, image processing software standardly equipped with a VE SEM of KEYENCE SHOJI. Observation and measurement are performed by observing and measuring at 10 places where the magnetic material 12 exists in the section of the measurement sample. The shortest distances a, b, and its ratio c are obtained as an average value of ten places.

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 paper base material 10A and the second paper base material 10B constituting the recording paper 100 of the second embodiment is preferably from 0.4 g / cm3 to 1.0 g / cm3 . More preferably 0.4 g / cm 3 or more and 0.9 g / cm 3 or less. When the density of each of the first paper base material 10A and the second paper base material 10B is within this range, the strength of the paper as the recording paper 100 is maintained, The occurrence of the step difference due to the magnetic material 12 disposed between the first paper substrate 10A and the second paper substrate 10B can be further suppressed.

The difference in density between the first paper base material 10A and the second paper base material 10B is preferably in the range of 0.1 g / cm3 or more and 0.4 g / cm3 or less in view of suppressing the generation of the step. More preferably 0.15 g / cm3 or more and 0.4 g / cm3 or less, and still more preferably 0.2 g / cm3 or more and 0.4 g / cm3 or less.

The basis weight of each of the first paper base material 10A and the second paper base material 10B is preferably 25 g / m 2 or more and 60 g / m 2 or less, more preferably 30 g / m 2 or more and 50 g / m 2 or less,

The basis weight of the entire recording paper 100 is preferably from 50 g / m 2 to 100 g / m 2, more preferably from 52 g / m 2 to 95 g / m 2, and further preferably from 54 g / m 2 to 90 g / m 2.

The thickness of the entire recording paper 100 is preferably 60 占 퐉 or more and 130 占 퐉 or less, more preferably 65 占 퐉 or more and 120 占 퐉 or less, and more preferably 70 占 퐉 or more and 100 占 퐉 or less.

(Third Embodiment)

The recording paper 100 of the third embodiment is such that the difference in density between the first paper base material 10A and the second paper base material 10B before the fusion is from 0.1 g / cm3 to 0.4 g / cm3. The difference in density between the first paper substrate 10A and the second paper substrate 10B is preferably 0.15 g / cm3 or more and 0.4 g / m3 or less, more preferably 0.2 g / cm3 or more and 0.4 g / cm3 or less.

As described above, in the recording paper 100 of the third embodiment, the density difference between the first paper base 10A and the second paper base 10B is 0.1 g / cm3 or more and 0.4 g / cm3 or less. That is, the density of either the first paper base material 10A or the second paper base material 10B is lower than the density of the other.

For example, in the recording paper 100 of the third embodiment, the difference in density between the first paper base material 10A and the second paper base material 10B is in the above range, and the first paper base material 10A, When the second paper base material 10B having a density lower than that of the first paper base material 10A is stuck to the first paper base material 10A, the recording paper 100 is formed such that the magnetic material 12 is sandwiched between the second paper base material 10A 10B. Therefore, the step of the magnetic material 12 is prevented from being generated on the surface of the recording paper 100. According to the configuration of the recording paper 100 of the third embodiment, the occurrence of steps is suppressed even when the entire thickness of the recording paper 100 is reduced. For example, when an image is formed on the recording paper 100 of the third embodiment by the electrophotographic method, generation of a level difference is suppressed on the surface of the recording paper 100, .

When the density of the second paper base material 10B is higher than the density of the first paper base material 10A, the magnetic material 12 is harder than the second paper base material 10B on the first paper base 10A side I get a lot of it.

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 recording paper 100 of the third embodiment contains a large amount of the magnetic material 12 on the side of the second paper base material 10B having a density lower than that of the first paper base material 10A side. Since the second paper base material 10B having a lower density is more flexible than the first paper base material 10A, the second paper base material 10B is deformed, So that it is more likely to be planted. Therefore, it is considered that the recording paper 100 is arranged on both sides of the magnetic material 12 on the coplanar surface 14 without creating a gap.

Further, in the recording paper 100 of the third embodiment, as described above, a large amount of the magnetic material 12 is contained on the second paper base 10B side. The distance from the magnetic material 12 to the surface of the recording paper 100 is smaller than the distance from the side of the second paper substrate 10B to the surface of the first paper substrate 10B, The side on the side of the base 10A is secured. Therefore, it is considered that the surface of the recording paper 100 on the side of the first paper base 10A is less likely to deteriorate excessively than the surface on the side of the second paper base 10B. For example, when an image is formed by the electrophotographic method, occurrence of transfer failure, which is thought to be caused by a decrease in electric resistance value on the surface of the recording paper 100, particularly on the first paper substrate 10A side, It is presumed that it will be more suppressed.

The density of each of the first paper base material 10A and the second paper base material 10B constituting the recording paper 100 of the third embodiment is preferably from 0.4 g / cm3 to 1.0 g / , More preferably 0.4 g / cm 3 or more and 0.9 g / cm 3 or less. When the density of each of the first paper base material 10A and the second paper base material 10B is within this range, the strength of the paper as the recording paper 100 is maintained, The generation of step differences due to the magnetic material 12 disposed between the first paper substrate 10A and the second paper substrate 10B is easily suppressed.

The basis weight of each of the first paper base material 10A and the second paper base material 10B is preferably 25 g / m 2 or more and 60 g / m 2 or less, more preferably 30 g / m 2 or more and 50 g / m 2 or less,

The basis weight of the entire recording paper 100 is preferably from 50 g / m 2 to 100 g / m 2, more preferably from 52 g / m 2 to 95 g / m 2, and further preferably from 54 g / m 2 to 90 g / m 2.

The thickness of the entire recording paper 100 is preferably 60 占 퐉 or more and 130 占 퐉 or less, more preferably 65 占 퐉 or more and 120 占 퐉 or less, and more preferably 70 占 퐉 or more and 100 占 퐉 or less.

The image forming method for the recording paper 100 according to the first to third embodiments of the present invention is not limited to the electrophotographic method. For example, an image may be formed by another method such as an inkjet method . Since the occurrence of step difference due to the magnetic material 12 is suppressed in the recording paper 100 of the present embodiment, defective image quality is suppressed even when an image is formed by, for example, an inkjet method.

&Lt; Method of producing recording paper &

(Fourth Embodiment)

Next, a manufacturing method of the recording paper 100 will be described as a fourth embodiment.

The method of manufacturing the recording paper 100 includes a magnetic material arranging step of disposing a magnetic material 12 on a paper substrate of either the first paper substrate 10A or the second paper substrate 10B, And a bonding step of bonding the other paper base material to one paper base material on which the magnetic material 12 is disposed so as to sandwich the material 12 therebetween. The difference in density between the first paper base material 10A and the second paper base material 10B is 0.1 g / cm3 or more and 0.4 g / cm3 or less.

As described above, the difference in density between the first paper base material 10A and the second paper base material 10B used in the manufacturing method of the recording paper 100 as the fourth embodiment is 0.1 g / cm3 or more and 0.4 g / cm3 or less. That is, the density of either the first paper base material 10A or the second paper base material 10B is lower than the density of the other.

For example, when the density of the second paper base material 10B which is in the above-mentioned range and the density of the first paper base material 10A and the second paper base material 10B is in the above- When the density is lower than that of the paper base material 10A, the recording paper 100 after the binding in the kneading step has the magnetic material 12, as in the recording paper 100 shown in Fig. 2, And the second paper base material 10B with respect to the concave surface of the second paper base material 10B than the first paper base material 10A.

This is because the magnetic material 12 is interposed between the first paper base material 10A and the second paper base material 10B in the bonding step and is pressed and compressed to a predetermined thickness to form the magnetic material 12 Is pushed into the side of the second paper base material 10B having a lower density. As a result, the ratio of the large amount to the second paper base material 10B increases, and the occurrence of the step difference due to the magnetic material 12 is suppressed. In addition, according to the manufacturing method of the fourth embodiment, even when the thickness of the entire recording paper 100 obtained is thin, the occurrence of steps is suppressed. For example, when an image is formed on the recording paper 100 obtained by the manufacturing method of the fourth embodiment by the electrophotographic method, generation of a step is suppressed on the surface of the recording paper 100, Image quality defects are likely to be suppressed.

When the density of the second paper base material 10B is higher than the density of the first paper base material 10A, the magnetic material 12 is harder than the second paper base material 10B on the first paper base 10A side I get a lot of it.

Further, in the recording paper 100 obtained by the manufacturing method of the fourth embodiment, generation of steps is suppressed, so that even if an image is formed by, for example, an inkjet method, defective image quality is suppressed.

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 recording paper 100 obtained by the manufacturing method of the fourth embodiment contains a large amount of the magnetic material 12 on the side of the second paper substrate 10B having a density lower than that of the first paper substrate 10A. Since the second paper base material 10B having a lower density is more flexible than the first paper base material 10A, the second paper base material 10B is deformed in the kneading step, So as to be embedded more in the substrate 10B side. Therefore, it is considered that the recording paper 100 is arranged on both sides of the magnetic material 12 on the coplanar surface 14 without creating a gap.

A method of manufacturing the recording paper 100 according to the fourth embodiment will be described below with reference to Fig. 4 showing an example of a manufacturing apparatus for manufacturing the recording paper 100. Fig.

The manufacturing apparatus for manufacturing the recording paper 100 is provided with a magnetic material arranging means for disposing the magnetic material 12 on one of the first paper substrate 10A or the second paper substrate 10B, And a bonding means for bonding the other paper base material to one paper base material on which the magnetic material 12 is disposed so as to sandwich the magnetic material 12 therebetween. The difference in density between the first paper base material 10A and the second paper base material 10B is 0.1 g / cm3 or more and 0.4 g / cm3 or less.

As shown in Fig. 4, the manufacturing apparatus for producing the recording paper 100 includes, for example, a first paper substrate 10A wound in a roll shape prepared in advance, a first paper substrate 10A unwound from a roll- An adhesive applying device 30 (an example of an adhesive applying device) for applying the adhesive 16 to the surface of the first paper base material 10A and an adhesive applying device 30 A second paper base material 10B wound in a roll shape prepared beforehand, and a second paper base material 10B on which a magnetic material 12 is disposed, And a joining device 50 (an example of the joining means) for joining together the base material 10A and the second paper base material 10B unwound from the roll-shaped second paper base material 10B.

4 includes a tension roll (tension imparting rolls, hereinafter the same) 22A and 22B for imparting a tension to the first paper base material 10A unwound from the first paper base material 10A in the roll form, A tension roll 22C for applying a tension to the first paper base material 10A after the adhesive 16 is applied by the adhesive applying device 30 and a first paper base material Tension rolls 22E and 22F for imparting tension to the second paper base material 10B unwound from the roll-shaped second paper base material 10B .

Hereinafter, each section of the production apparatus for producing the recording paper 100 will be described.

- Adhesive application system -

In Fig. 4, the adhesive applicator 30 is provided on the downstream side toward the conveying direction of the first paper base material 10A wound in a roll prepared in advance. The adhesive applying device 30 is an apparatus for applying the adhesive 16 to the surface of the first paper base material 10A (the surface serving as the concave surface 14) unwound from the roll-shaped first paper base material 10A.

The adhesive applicator 30 includes an adhesive tank 36 containing the adhesive 16, an adhesive application roll 32 for applying the adhesive 16, a doctor 16 for adjusting the application amount of the adhesive 16, A roll 34 and a pressing roll 38 for pressing the first paper base material 10A disposed so as to oppose the adhesive application roll 32 so as to sandwich the first paper base material 10A therebetween .

As the adhesive application roll 32, for example, a roll made of metal or a metal alloy may be used. Further, the surface of the roll of the adhesive application roll 32 may be a smooth roll without grooves, or may be a roll provided with a plurality of grooves (cells) on its surface.

The adhesive application roll 32 is provided in contact with the adhesive 16 in the adhesive tank 36 (including immersion). The adhesive application roll 32 is rotated in the same direction as the conveying direction of the first paper base material 10A so that the adhesive 16 contained in the adhesive agent storage tank 36 is pulled up to form an adhesive application roll The adhesive 16 is adhered to the surface of the base material 32. The excess adhesive 16 adhering to the surface of the adhesive application roll 32 is removed by the doctor roll 34 rotating in the same direction as the rotation direction of the adhesive application roll 32. Thereafter, the adhesive 16 adhered to the surface of the adhesive application roll 32 is applied to the first paper base 10A.

4, the adhesive agent storage tank 36, the adhesive agent application roll 32, and the doctor roll 34 are shown as the adhesive agent application device 30. However, the adhesive agent application tank 30 is not limited to this, A known coating device may be employed.

For example, the rotational direction of the adhesive application roll 32 may be rotated in the direction opposite to the conveying direction of the first paper base material 10A. It is also possible to apply the adhesive 16 directly to the adhesive application roll 32 by an apparatus such as an adhesive dispensing apparatus and apply the adhesive 16 to the first paper substrate 10A.

The doctor roll 34 may be arranged so as to regulate the adhesive 16 adhered to the adhesive application roll 32. Further, the present invention is not limited to this, as long as it is a regulating member for regulating the adhesive 16 adhered to the adhesive application roll 32. For example, it may be a blade-like or bar-shaped regulating member.

- Magnetic material placement device -

The magnetic material arranging device 40 is provided on the downstream side of the adhesive applicator 30 toward the conveying direction of the first paper substrate 10A. The magnetic material arranging device 40 is a device for disposing the magnetic material 12 on the adhesive application surface of the first paper base material 10A coated with the adhesive 16 by the adhesive applying device 30. [

4, the magnetic material arranging apparatus 40 includes a magnetic material accommodating tank 46 in which a magnetic material 12 is accommodated, a magnetic material arranging roll 42, and a first paper substrate 10A, And a pressing roll 48 for pressing the first paper base material 10A disposed opposite to the magnetic material arrangement roll 42. [

The magnetic material arrangement roll 42 is provided in the magnetic material receiving tank 46 in which the magnetic material 12 is accommodated and the magnetic material arrangement roll 42 is rotated to rotate the magnetic material accommodating tank 46, (12) is pulled up. Then, the magnetic material 12 is placed on the adhesive application surface of the first paper base 10A by the magnetic material arrangement roll 42. [ The shape of the roll is not particularly limited as long as the magnetic material 12 is pulled up and disposed on the first paper base 10A.

In Fig. 4, the magnetic material 12 is pulled up by the magnetic material arrangement roll 42, but the present invention is not limited to this. For example, a method may be employed in which the linear magnetic material 12 not cut is continuously fed and arranged. In this case, when the recording paper 100 is cut to a predetermined size, the magnetic material 12 is cut along with the cutting of the recording paper 100.

- Fusion device -

The fusing device 50 is provided on the downstream side of the magnetic material arranging device 40 toward the conveying direction of the first paper substrate 10A and on the downstream side toward the conveying direction of the second paper substrate 10B . The kneading apparatus 50 includes a first paper base 10A and a second paper base 10B on which the magnetic material 12 is disposed and a magnetic material 12 on the first paper base 10A and the second paper base 10B, (10B), and presses and compresses it to a predetermined thickness.

4 is provided with a pair of pressurizing rolls 52A and 52B having a heater. The pressurizing compression rolls 52A and 52B are disposed so as to face each other so as to sandwich the first paper base material 10A on which the magnetic material 12 is disposed and the second paper base material 10B. Examples of the form of the pressurizing compression rolls 52A and 52B include rolls in which an elastic layer such as rubber is formed on a metal roll, but the invention is not limited thereto. For example, the pressurizing press rolls 52A and 52B may be a combination of a metal roll and a roll in which an elastic layer such as rubber is formed on the metal roll.

The heating temperature of the pressurizing rolls 52A and 52B is not particularly limited. For example, the recording paper 100 may be a temperature range (for example, 25 ° C or more and 150 ° C or less) in which deterioration by heat is suppressed. The pressure to be compressed and compressed by the pressurizing rolls 52A and 52B may be adjusted to a pressure at which the recording paper 100 having a predetermined thickness can be obtained.

The joining device 50 shown in Fig. 4 shows the pressurizing and compressing device having the pressurizing and compressing rolls 52A and 52B having the heater, but the invention is not limited thereto.

For example, the bonding apparatus 50 may be a heating apparatus having a heater and a pressurizing and compressing apparatus having no heater, which are independent of each other. The recording paper 100 heated by the heating device by these devices may be pressurized and compressed by a pressurizing device.

Further, for example, the knocking device 50 may be a pressurizing / compressing device without a heater. With this apparatus, the fusion of the first paper base material 10A and the second paper base material 10B on which the magnetic material 12 is disposed and the compression of the recording paper 100 can be performed at the same time.

In addition, for example, the knocking device 50 may not be provided with a heater but may be a device that performs only the coupling and a device that performs compression and compression, which are independent of each other. With these devices, the first paper base material 10A and the second paper base material 10B on which the magnetic material 12 is arranged may be pressed and compressed against the recording paper 100 after the cementation.

In the above description, the manufacturing apparatus for producing the recording paper 100 of the present embodiment has been described with reference to FIG. 4 as an example, but the present invention is not limited to the manufacturing apparatus shown in FIG.

That is, the manufacturing apparatus for producing the recording paper 100 according to the present embodiment is characterized in that the magnetic material 12 is disposed on either one of the first paper substrate 10A or the second paper substrate 10B And means for bonding the other paper base material to one paper base material on which the magnetic material 12 is disposed so as to sandwich the magnetic material 12 therebetween.

4 shows an apparatus for applying the adhesive 16 to the lower surface side of the first paper substrate 10A and disposing the magnetic material 12 from the lower surface side in the manufacturing apparatus shown in Fig. The adhesive 16 is applied to the upper surface side of at least one of the first paper substrate 10A and the second paper substrate 10B and the magnetic material 12 is disposed from the upper surface side coated with the adhesive 16 by scattering or the like And then the first paper base material 10A and the second paper base material 10B are joined together. However, in consideration of the impregnating sphere of the adhesive 16 to the paper substrate, it is preferable that the apparatus includes a device for applying the adhesive 16 to at least the first paper substrate 10A.

4 shows a configuration in which the magnetic material 12 is disposed on the adhesive application surface of the first paper base material 10A coated with the adhesive agent 16, The adhesive 16 is applied to the upper surface and the magnetic material 12 is disposed on the upper surface of the second paper base material 10B to which the adhesive 16 is not applied. Then, the first paper base material 10A and the second paper Or may be a device for bonding the substrate 10B.

4 shows a configuration in which the adhesive agent applying device 30 and the magnetic material arranging device 40 are respectively provided. However, it is also possible that the adhesive agent applying device 30 and the magnetic material arranging device 40 are provided on at least one of the first paper substrate 10A and the second paper substrate 10B, Or may be a device for applying the magnetic material 12 together with the adhesive 16 by the adhesive 16 in which the magnetic material 12 is dispersed in the adhesive 16.

4 shows a device for joining a roll-shaped first paper base material 10A and a roll-shaped second paper base material 10B. For example, a sheet-like first paper base material 10A may be used, And the second paper base material 10B in sheet form.

Further, for example, a dryer (not shown) may be provided on the downstream side of the knocking device 50 toward the carrying direction.

Next, the manufacturing process (operation) of the recording paper 100 of the present embodiment will be described.

· Magnetic material placement process

First, a first paper substrate 10A wound in a roll form and a second paper substrate 10B wound in a roll form are prepared. In the production apparatus shown in Fig. 4, the first paper base material 10A wound in a roll shape is a position to supply the first paper base material 10A, And is disposed at the most upstream side. The second paper base material 10B wound in a roll shape is arranged at a position to feed the second paper base material 10B so as to be in contact with the first paper base material 10A on which the magnetic material 12 is disposed, The downstream side of the magnetic material arrangement device 40 and the upstream side of the fusion device 50. [ The first paper base material 10A and the second paper base material 10B may be exchanged with each other.

Next, the first paper base material 10A is released from one end of the first paper base material 10A wound in a roll shape. The first paper base material 10A released is tensioned by the tension rolls 22A and 22B and is conveyed toward the adhesive applicator 30. The adhesive agent 16 is applied to the surface of the first paper substrate 10A (the surface serving as the cohesive surface 14) conveyed to the adhesive applicator 30 by the adhesive applicator 30. The first paper base material 10A after the adhesive 16 has been applied is tensioned by the tension roll 22C provided on the downstream side of the adhesive applying device 30 toward the conveying direction, 40). The first paper base material 10A coated with the adhesive 16 conveyed to the magnetic material arranging device 40 is placed on the adhesive surface of the first paper base material 10A by the magnetic material arranging device 40, (12).

· Integration process

The first paper base material 10A after the magnetic material 12 has been placed is tensioned by the tension roll 22D provided on the downstream side of the magnetic material arranging device 40 toward the conveying direction, . On the other hand, the second paper base material 10B wound in a roll shape is disposed on the downstream side of the magnetic material arranging device 40 toward the conveying direction and on the upstream side of the joining device 50 in advance. Then, the second paper base material 10B is released from one end of the second paper base material 10B wound in a roll shape. The second paper base material 10B thus unwound is fed with tension by the tension rolls 22E and 22F and is conveyed toward the collating apparatus 50. [ The first paper base material 10A and the second paper base material 10B on which the magnetic material 12 is disposed are transported together to the binding device 50 and then the magnetic material 12 is transported by the binding device 50 The first paper base material 10A and the second paper base material 10B are bonded together. Then, the recording paper 100 is pressed and compressed together with the binding to obtain a predetermined thickness.

When a dryer (not shown) is provided on the downstream side of the kneading apparatus 50 toward the carrying direction, the recording paper 100 may be dried by the dryer.

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 first paper base 10A wound in a roll form and the second paper base 10B wound in a roll form, applying the adhesive, arranging the magnetic material, and coalescing, The present invention is not limited thereto.

Through the above process, the recording paper 100 is obtained.

The recording paper 100 thus obtained can be subjected to various surface treatments, various post-finishing treatments, and smoothing (e.g., surface treatment), as needed, on at least one of the first paper substrate 10A and the second paper substrate 10B. At least one kind of processing may be performed.

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 paper base material 10A and the second paper base material 10B. For example, by performing various post-processing such as adhesion, magnetic, flame retardant, heat resistance, water resistance, oil resistance, anti-slip, antistatic, etc., various functions are imparted, do.

Further, the obtained recording paper 100 is cut to a predetermined size after being subjected to the above-described various processes or before being performed, and is provided for use.

Hereinafter, each element common to the recording paper 100 of the first to fourth embodiments of the present embodiment will be described in detail. In the following description, reference numerals are omitted.

(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 &gt; extended &lt; / RTI &gt; 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 recording paper 100 good.

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, &quot; part &quot; and &quot;% &quot; 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-color image density 100% solid portion patch 25 cm x 25 cm) was formed on the paper obtained in each example using Fuji Xerox's "Apeos Port C4300" to evaluate the transfer failure. The evaluation criteria are as follows.

-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).

&Lt; 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, length 40 mm, width 5.0 mm, thickness 0.03 mm) was applied to the back surface of the base material 1B-1 at the surface of the base material 1B- 2, and the back surface of the base material 1A-1 and the surface of the base material 1B-1 were overlapped and pressed to form a recording paper (basis weight 86 g / m 2).

&Lt; 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.

&Lt; 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.

&Lt; 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 /

&Lt; 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 &lt; 2 &gt;) 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 /

&Lt; 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, length 40 mm, width 50 (mm)) was formed on the surface of the base material 1A-1 as the second paper base material by applying an adhesive to the back surface of the base material 1A- Mm in thickness and 0.03 mm in thickness) were arranged so as to be combined in an area of A4 size so that the back surface of the base material 1A-1 as the first paper base material and the surface of the base material 1A-1 as the second paper base material were superimposed, (Basis weight: 84 g / m &lt; 2 &gt;).

[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.

&Lt; 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, length 40 mm, width 50 mm, thickness 0.03 mm) was coated on the surface of the base material 2B-1 with an adhesive agent on the back surface of the base material 2A- Two sheets of the surface of the base material 2A-1 and the surface of the base material 2B-1 were overlapped with each other by press-compression to obtain a recording paper (basis weight 86 g / m 2).

&Lt; 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.

&Lt; 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.

&Lt; 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 paper base material 10B: second paper base material
12: magnetic material 14: coplanar surface
16: Adhesive 30: Adhesive application device
40: magnetic material arranging device 50:
100: Recording paper

Claims (7)

A first paper substrate,
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 method according to claim 1,
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. 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. 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 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. 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. 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. The method according to claim 6,
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.

Images