WO2020101034A1

WO2020101034A1 - Magnetic film

Info

Publication number: WO2020101034A1
Application number: PCT/JP2019/044980
Authority: WO
Inventors: 清前橋
Original assignee: ニチレイマグネット株式会社
Priority date: 2018-11-15
Filing date: 2019-11-15
Publication date: 2020-05-22
Also published as: JP6955649B2; JP2021185043A; JP7349168B2; JPWO2020101034A1

Abstract

To simplify a manufacturing process in a magnetic film having front and back sides on which printing can be performed, this magnetic film 10 comprises: a magnetic layer 14; a first ink receiving layer 21 laminated on one side of the magnetic layer 14; and a second ink receiving layer 22 directly laminated on the reverse side from the first ink receiving layer 21 side of the magnetic layer 14, or laminated on a colored layer 13 when the colored layer 13 is laminated on the reverse side. This magnetic film is configured such that printing can be performed on each of the first ink receiving layer 21 and the second ink receiving layer 22.

Description

Magnetic film

The present invention relates to a magnetic film that can be attached using magnetic force.

▽ Conventionally, magnetic films that can print on both front and back sides have been known. This type of magnetic film is described in Patent Document 1.

Patent Document 1 describes a magnetic composite film having two precursors each having a magnetic layer formed on the back surface of a water-resistant thin layer base material having a printable layer on the front surface. In this magnetic composite film, the two magnetic layers of the precursor are bonded together by an adhesive or thermocompression bonding.

JP, 2014-168926, A

By the way, the magnetic film described in Patent Document 1 can be manufactured by using a magnetic film that can be printed on only one side as it is, but has two thin layer base materials and two magnetic layers each, and thus the number of layers is relatively large. Become. Therefore, many steps are required when the manufacturing process is viewed as a whole.

The present invention has been made in view of such circumstances, and an object of the present invention is to simplify the manufacturing process in a magnetic film capable of printing on both front and back surfaces.

In order to solve the above-mentioned problems, the first invention is directed to a magnetic layer, a first ink receiving layer laminated on one side of the magnetic layer, and a surface of the magnetic layer opposite to the first ink receiving layer side, or When the coloring layer is laminated on the opposite surface, the coloring layer is provided with the second ink receiving layer directly laminated, and printing can be performed on each of the first ink receiving layer and the second ink receiving layer. Is a magnetic film.

The second invention is the same as the first invention, further comprising a film-shaped base material that is disposed between the first ink receiving layer and the magnetic layer.

In a third aspect based on the second aspect, the first ink receiving layer is laminated directly on the substrate, and the second ink receiving layer is laminated on the surface of the magnetic layer opposite to the substrate side. It is laminated directly to the layers.

In a fourth aspect based on the third aspect, the total thickness of the second ink receiving layer and the colored layer is larger than the thickness of the first ink receiving layer.

The fifth invention is the third or fourth invention, wherein the total thickness of the second ink receiving layer and the colored layer is at least 2 μm or more.

A sixth invention is a film-shaped first base material, a first ink receiving layer laminated on one surface of the first base material, and a magnetic layer directly laminated on the other surface of the first base material. In the case where the second base material directly laminated on the surface opposite to the first base material side of the magnetic layer and the coloring layer laminated on the opposite surface or opposite surface of the second base material from the magnetic layer side Is a magnetic film comprising a colored layer and a second ink receiving layer directly laminated on the colored layer, and is configured to be printable on each of the first ink receiving layer and the second ink receiving layer.

In the first invention, when the colored layer is laminated on the surface of the magnetic layer opposite to the first ink receiving layer side or the opposite surface thereof, the second ink receiving layer is directly laminated on the colored layer. ing. Therefore, unlike the magnetic film described in Patent Document 1, the base material layer is not interposed between the magnetic layer and the second ink receiving layer. According to the first invention, in a magnetic film capable of printing on both front and back sides, the number of layers can be made smaller than that of the magnetic film described in Patent Document 1, and the manufacturing process can be simplified. ..

In the sixth invention, the base material is directly laminated on the front side and the back side of the magnetic layer. Therefore, unlike the magnetic film described in Patent Document 1, only one magnetic layer is interposed between the first base material and the second base material. According to the sixth invention, in the magnetic film capable of printing on both the front and back sides, the number of layers can be made smaller than that of the magnetic film described in Patent Document 1, and the manufacturing process can be simplified. .

FIG. 1 is a cross-sectional view of the magnetic film according to the embodiment. FIG. 2 is a cross-sectional view of the magnetic film according to the embodiment when the colored layer is not provided on the back side of the magnetic layer. FIG. 3 is a cross-sectional view for explaining the magnetic film manufacturing method in the embodiment. FIG. 4 is a cross-sectional view for explaining a method of manufacturing a magnetic film in another embodiment. FIG. 5 is a sectional view of a magnetic film according to another embodiment. FIG. 6 is a cross-sectional view of a magnetic film according to another embodiment, which is different from FIG. FIG. 7 is a cross-sectional view of a magnetic film according to another embodiment. FIG. 8A is a perspective view of a testing machine used in the bending resistance test, and FIG. 8B is a view of the bending resistance test viewed from the side of the testing machine. FIG. 9: is a figure for demonstrating the measuring method of the curvature degree of the test piece wound on the cylinder for a long time.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 9. The following embodiments are examples of the present invention, and are not intended to limit the scope of the present invention, its application, or its application.

[Structure of magnetic film]
The magnetic film 10 is a magnetic composite film in which a plurality of functional layers are combined. The magnetic film 10 has flexibility and can print on both front and back surfaces. Specifically, as shown in FIG. 1, the magnetic film 10 includes a film-shaped base material (thin layer base material) 12, a first ink receiving layer 21 laminated on one surface of the base material 12, and a base material 12. Magnetic layer 14 laminated on the other surface of the magnetic layer 14, the colored layer 13 laminated on the surface of the magnetic layer 14 opposite to the base material 12 side, and the second ink receiving layer 22 laminated directly on the colored layer 13. And is configured such that various types of printing such as inkjet printing, offset printing, letterpress printing or thermal transfer printing can be performed on each of the first ink receiving layer 21 and the second ink receiving layer 22. There is. In addition, below, the 1st ink receiving layer 21 side is called "front side", and the 2nd ink receiving layer 22 side is called "back side."

In the magnetic film 10, the first ink receiving layer 21, the substrate 12, the magnetic layer 14, the coloring layer 13, and the second ink receiving layer 22 are laminated in this order from the front side. Each of the first ink receiving layer 21, the base material 12, the magnetic layer 14, the coloring layer 13, and the second ink receiving layer 22 is formed with a substantially uniform thickness over the length direction and the width direction of the magnetic film 10. Has been done.

As shown in FIG. 2, without providing the colored layer 13 on the back side of the magnetic layer 14, the second ink receiving layer 22 is directly formed on the surface (back surface) of the magnetic layer 14 opposite to the base material 12 side. You may laminate. Although the first ink receiving layer 21 is directly laminated on the surface of the base material 12 in FIGS. 1 and 2, a coloring layer (front side coloring layer) is laminated on the surface of the base material 12 and The first ink receiving layer 21 may be directly laminated on the coloring layer.

The base material 12 is a member having a certain thickness and having flexibility. As the base material 12, for example, a colored material such as white is used, but a colorless material can also be used. The thickness of the substrate 12 can be 20 μm or more and 300 μm or less, and particularly preferably 50 μm or more and 220 μm or less. When the thickness of the base material 12 is 50 μm or less, the hiding power for the color (for example, black) of the magnetic layer 14 may be insufficient. On the other hand, when the thickness of the base material 12 exceeds 220 μm, the magnetic air gap (distance from the surface of the adherend to the magnetic layer 14) at the time of magnetic sticking for sticking the magnetic film 10 to the adherend becomes large, and There is a risk that the suction power will be insufficient. As the base material 12, synthetic paper, a plastic film containing inorganic powder, waterproof paper, or the like can be used.

Examples of synthetic paper used for the base material 12 include YUPO synthetic papers FEB, FGS, FPG, VJFP, VJFD (manufactured by Yupo Corporation), Toyojet GP, MW, MT, MP (manufactured by Toyobo Co., Ltd.), Peach Coat. Examples include SPUY (manufactured by Nisshinbo Co., Ltd.).

Examples of the plastic film containing inorganic powder or the like used for the base material 12 include polyester film CRISPER (manufactured by Toyobo Co., Ltd.) and semi-rigid vinyl chloride film 10P (manufactured by RIKEN TECHNOS CORPORATION). Examples of the waterproof paper used for the base material 12 include Eco-Crystal (manufactured by Shin Tomoegawa Paper Co., Ltd.) and Kareka (manufactured by Mitsubishi Kagaku Media Company).

The magnetic layer 14 is a layer in which magnetic material powder is dispersed in a binder such as an organic binder. For example, an organic polymer elastomer is used as the binder. The main composition of the magnetic layer 14 is magnetic material powder and an organic polymer elastomer. As the organic polymer elastomer used for the magnetic layer 14, chlorinated polyethylene elastomer, chlorosulfonated polyethylene elastomer, ethylene vinyl acetate copolymer elastomer is used regardless of whether hard magnetic material powder or soft magnetic material powder is used as the magnetic material powder. , Ethylene ethyl acrylate elastomer, ethylene propylene elastomer, or urethane-based elastomer can be used. In addition, a mixture of these or a mixture of these and a plastomer (plastic) can be used as appropriate according to desired physical properties.

The magnetic layer 14 is a hard magnetic layer made of hard magnetic material powder or a soft magnetic layer made of soft magnetic material powder. When the magnetic layer 14 is a hard magnetic layer, the magnetic film 10 can be used as a magnet by magnetizing (magnetizing) after molding the magnetic layer 14. In this case, double-sided magnetization (for example, double-sided multi-pole magnetization) is performed. However, one-sided magnetization (for example, one-sided multi-pole magnetization) may be performed. Although the magnetic layer 14 is magnetized so as to have magnetic anisotropy, it may be magnetized so as to have magnetic isotropy. On the other hand, when the magnetic layer 14 is a soft magnetic layer, the magnetic film 10 can be used as an adherend of a magnet.

When the magnetic layer 14 is a hard magnetic layer, examples of the hard magnetic material powder include hard ferrite powder (M-type ferrite such as strontium ferrite powder and barium ferrite powder, zinc / strontium ferrite powder, and zinc / barium ferrite powder). W type ferrite) can be used. Hard ferrite powder is a magnet material powder having a high coercive force and a ferromagnetic substance. As the hard magnetic material powder, other than hard ferrite powder may be used.

Further, when the magnetic layer 14 is a hard magnetic layer, the content of the hard magnetic material powder with respect to the total amount of the magnetic layer 14 can be selected from 30% by volume to 70% by volume.

When the magnetic layer 14 is a soft magnetic layer, the soft magnetic material powder is a ferromagnetic material having a low coercive force and a high magnetic permeability (hereinafter, referred to as “ferromagnetic material powder”) or a ferrimagnetic material. Among them, a ferromagnetic material having a low coercive force and a high magnetic permeability (referred to as "ferrimagnetic material powder") or a mixture of ferromagnetic material powder and ferrimagnetic material powder can be used. As the ferromagnetic powder, iron powder, magnetic stainless powder, sendust powder or the like can be used. As the ferrimagnetic powder, manganese zinc ferrite powder which is a soft ferrite, nickel zinc ferrite powder, magnetite powder = ferric tetroxide powder and the like can be used.

When ferromagnetic powder is used as the soft magnetic material powder, the content of the soft magnetic material powder relative to the total amount of the magnetic layer 14 is preferably 40% by volume or more and 60% by volume or less. If the content is less than 40% by volume, the magnetic attraction force may be insufficient, and if it exceeds 60% by volume, the coating processability may be deteriorated.

When ferrimagnetic powder is used as the soft magnetic material powder, the content of the soft magnetic material powder with respect to the total amount of the magnetic layer 14 is preferably 50% by volume or more and 65% by volume or less. If the content is less than 50% by volume, the magnetic attraction force may be insufficient, and if it exceeds 65% by volume, the coating processability may be deteriorated.

When using a mixture of ferromagnetic powder and ferrimagnetic powder as the soft magnetic material powder, use a mixture of 25% by volume or more and 35% by weight or less of ferromagnetic powder and 65% by volume or more and 75% by weight or less of ferrimagnetic powder. You can In this case, the content of the soft magnetic material powder with respect to the total amount of the magnetic layer 14 is preferably 50% by volume or more and 65% by volume or less. If the content is less than 50% by volume, the magnetic adsorption force may be insufficient, and if it exceeds 65% by volume, the coating processability may be deteriorated.

The thickness of the magnetic layer 14 can be 30 μm or more and 350 μm or less in the case of a hard magnetic layer, and particularly preferably 50 μm or more and 150 μm or less. If the thickness of the magnetic layer 14 is less than 30 μm, the performance (adsorption force) may be insufficient, and if it exceeds 350 μm, the performance becomes excessive and the thickness increases. When the ferromagnetic powder is used in the soft magnetic layer, the thickness of the magnetic layer 14 is preferably 15 μm or more and 75 μm or less. If the thickness of the magnetic layer 14 is less than 15 μm, the performance may be insufficient. If it exceeds 75 μm, the performance becomes excessive and the thickness becomes large. When ferrimagnetic powder is used in the soft magnetic layer, the thickness of the magnetic layer 14 is preferably 15 μm or more and 90 μm or less. If the thickness of the magnetic layer 14 is less than 15 μm, the performance may be insufficient, and if it exceeds 90 μm, the performance becomes excessive and the thickness becomes large.

Each of the ink receiving layers 21 and 22 is a coating layer that absorbs and fixes the ink that has landed during inkjet printing. Each of the ink receiving layers 21 and 22 may be a water-soluble resin system composed of a resin that easily absorbs an ink solvent, or an inorganic pigment system in which a large number of voids into which the ink permeates are formed in the ink receiving layer. Good.

As the ink receiving layer coating material (treatment material) used to form the water-soluble resin type ink receiving layers 21 and 22, NS-63P (polyester resin type, manufactured by Takamatsu Yushi Co., Ltd.), NS-310X (polyurethane resin type) , Takamatsu Yushi Co., Ltd., etc. can be used. Examples of the ink-receiving layer coating used for forming the inorganic pigment-based ink-receiving

layers

21 and 22 include Pateracol IJ-150R (inorganic filler-containing urethane resin-based dispersion, manufactured by DIC Corporation), RSI- 100 (hybrid resin dispersion containing inorganic filler, manufactured by DIC Corporation), MZ-477 or MZ-480, (acrylic resin dispersion containing inorganic filler, manufactured by Takamatsu Yushi Co., Ltd.), etc. it can.

For the first ink receiving layer 21, a coating material for the ink receiving layer is selected according to the type of the substrate 12. The thickness of the first ink receiving layer 21 is preferably 1 μm or more and 30 μm or less. When the thickness of the first ink receiving layer 21 is less than 1 μm, the ink receiving ability is insufficient, and when it exceeds 30 μm, the ink receiving ability is excessive and uneconomical.

For the second ink receiving layer 22, a coating material for the ink receiving layer is selected according to the composition of the magnetic layer 14 and the like. The thickness of the second ink receiving layer 22 is preferably 1 μm or more and 30 μm or less. When the thickness of the second ink receiving layer 22 is less than 1 μm, the ink receiving ability is insufficient, and when it exceeds 30 μm, the ink receiving ability is excessive and uneconomical.

When the second ink receiving layer 22 and the coloring layer 13 are referred to as “back side coating layer”, the thickness of the back side coating layer (total thickness of the second ink receiving layer 22 and the coloring layer 13) is the magnetic layer 14 In consideration of the hiding power for the above, it can be 2 μm or more (preferably 4 μm or more). The back side paint layer is composed of only the second ink receiving layer 22 in the case of FIG. Further, when the color of the magnetic layer 14 is gray, the back side coating layer can be made thinner than when the magnetic layer 14 is black.

When the “front side paint layer” including the first ink receiving layer 21 and the front side coloring layer is referred to, the back side paint layer is thicker than the front side paint layer. In the case of FIG. 1, the total thickness of the second ink receiving layer 22 and the colored layer 13 is larger than the thickness of the first ink receiving layer 21. As a result, the magnetic film 10 can be thinned while ensuring the hiding power for the magnetic layer 14.

The coloring layer 13 is a layer composed of a paint film (coating film) containing an inorganic pigment or the like. The paint used for the colored layer 13 is a matte paint, but a glossy paint can also be used. The color of the colored layer 13 can be selected from white, gray, pale yellow, pale blue, and other white or light colors. A transparent color may be selected as the color of the colored layer 13. As the coating material, polyester-based SS16-611 (manufactured by Toyo Ink Co., Ltd.), polyester-based PAL mat 8, polyester-based RAM, urethane acrylic ULA, etc. (manufactured by Seiko Advance Co., Ltd.) can be used. Moreover, the pattern of the colored layer 13 may be plain, or may be vertical lines, horizontal lines, a lattice, or a pattern other than these.

[Method for producing magnetic film]
The manufacturing method of the magnetic film 10 includes a magnetic layer forming step of forming the magnetic layer 14 by coating and a coating layer forming step of forming a coating layer on the front surface of the base material 12 and the back surface of the magnetic layer 14 by coating. Do in order. The surface of the base material 12 or the back surface of the magnetic layer 14 may be subjected to surface treatment such as hydrophilic treatment. Below, each process of a manufacturing method is demonstrated in detail.

In the magnetic layer forming step, the manufacturing of the coating liquid and the coating of the coating liquid are performed in this order. In the production of the coating liquid, for example, in a stirrer, an organic polymer elastomer (binder) and magnetic material powder are sequentially added to a varnish or emulsion dissolved in an organic solvent and stirred and mixed. Next, a dispersion treatment is performed using a sand mill (beads mill). Then, the viscosity is adjusted so that the viscosity is suitable for the coater used for coating, and a filtration process for removing foreign matter is further performed. As a result, the coating liquid is completed. The viscosity is adjusted by diluting the organic polymer elastomer with an organic solvent when it is dissolved in an organic solvent, and with water when it is an emulsion.

Subsequently, in coating the coating liquid, a predetermined coating thickness is applied to the substrate 12 by a known method using a coater such as a blade coater, a bar coater, a comma coater, a gravure coater, a roll coater, or a reverse roll coater. The coating liquid is applied so that The base material 12 coated with the coating liquid is dried in a warm air drying oven (for example, 50 to 100 ° C. for 10 minutes). In the case of a soft magnetic layer, the magnetic layer 14 is formed as described above (see FIG. 3A).

On the other hand, in the case of a hard magnetic layer, the base material 12 after the coating liquid is dried in a warm air drying oven is magnetized (for example, double-sided multipolar magnetization). The base material 12 before the coating liquid is dried in a warm air drying furnace may be magnetized to align the NS orientation directions. In this case, the magnetic layer 14 becomes an anisotropic magnet.

When performing double-sided multi-pole magnetization, for example, a method consisting of a known direct-current magnetizing power supply (high-voltage capacitor type) and a one-turn multi-pole magnetizing yoke, or a permanent magnet type multi-pole magnetizing roll method, between adjacent poles. Is preferably magnetized so that the value is 0.5 or more and 3 mm or less. If the gap between the poles is less than 0.5 mm, it is difficult to manufacture a magnetizing yoke or a magnetizing roll, and if it exceeds 3 mm, the range between the poles (efficient magnetization) suitable for the magnet is deviated.

In the paint layer forming step, the ink for the ink receiving layer is applied to the front side of the substrate 12, and then the paint for the ink receiving layer is dried in a drying oven (for example, 60 to 90 ° C. for 12 minutes). Further, after applying the coating material to the back side of the magnetic layer 14, the coating material is dried in a drying oven. Then, after applying the ink receiving layer coating material, the ink receiving layer coating material is dried in a drying oven. As a coating device used for coating the paint or the paint for the ink receiving layer, for example, a coater such as an air knife coater, a blade coater, a bar coater, a comma coater, a gravure coater, a roll coater, a reverse roll coater, or a curtain coater can be used. .

For example, in the paint layer forming step, as shown in FIG. 3B, the first ink receiving layer 21 is formed by applying and drying the ink receiving layer coating material on the front side of the substrate 12 after the magnetic layer forming step. To form. Then, as shown in FIG. 3C, the colored layer 13 is formed by applying and drying the paint on the back side of the magnetic layer 14. Further, as shown in FIG. 3D, the second ink receiving layer 22 is formed by applying and drying the ink receiving layer coating material on the back side of the colored layer 13.

The order of applying and drying the paint may be reversed on the front side and the back side of the base material 12, or the first ink receiving layer 21 and the second ink receiving layer 22 may be formed at the same time. Further, the coating and drying of the paint may be repeated to form a plurality of colored layers 13. Further, in the second ink receiving layer 22, when the color of the magnetic layer 14 is gray, the number of the colored layers 13 can be reduced as compared with the case where the magnetic layer 14 is black. it can.

[Effects of Embodiment]
In the present embodiment, since only one base material 12 and one magnetic layer 14 are provided, it is possible to reduce the number of layers in the magnetic film 10 that can be printed by the inkjet method or the like on both front and back surfaces. It is possible to simplify the manufacturing process. Further, the thickness can be reduced, and the flexibility of the magnetic film 10 can be improved. If the magnetic film 10 does not need to have flexibility, it may be made less flexible by selecting the material of the base material 12 or the magnetic layer 14.

The magnetic film 10 according to the present embodiment can be manufactured as a film having arbitrary standard dimensions, and after manufacturing, printing can be performed on both sides by an inkjet method or the like. Then, the user can select the one printing surface as the front side and stick the magnetic film 10 to the adherend, and at the necessary timing, stick the other printing surface to the front side. Therefore, the two printing surfaces used at different timings can be realized by one magnetic film 10.

[Other Embodiments]
In the above-described embodiment, the magnetic layer 14 is formed before the formation of the first ink receiving layer 21, but as shown in FIGS. The magnetic film 10 may be manufactured in the order of forming the layer 14, and then forming the colored layer 13 and the second ink receiving layer 22.

In the above embodiment, the base material 12 is laminated on the front side of the magnetic layer 14, but the base material 12 may be omitted. In this case, the magnetic film 10 includes, as shown in FIG. 5, a magnetic layer 14, a first ink receiving layer 21 directly laminated on one surface of the magnetic layer 14, and a first ink receiving layer 21 in the magnetic layer 14. And a second ink receiving layer 22 laminated directly on the surface opposite to the side, and ink jet printing or offset printing is performed on each of the first ink receiving layer 21 and the second ink receiving layer 22. Various types of printing such as letterpress printing or thermal transfer printing are possible. The magnetic layer 14 plays a role of a base material that supports the ink receiving layers 21 and 22. Although the colored layer 13 is not provided on the front side and the back side of the magnetic layer 14 in FIG. 5, the colored layer 13 may be provided on both the front side and the back side of the magnetic layer 14 as shown in FIG. 6. The colored layer 13 may be provided only on the front side of the magnetic layer 14, or the colored layer 13 may be provided only on the back side of the magnetic layer 14. As a result, the magnetic film 10 having different hues (whiteness, etc.) from the front and the back can be obtained. According to the magnetic film 10 of FIG. 5 or FIG. 6, it is possible to further reduce the thickness and further improve the flexibility as compared with the above-mentioned embodiment.

In the above-described embodiment (the magnetic film 10 in FIGS. 1 and 2), the base material 12 is provided in one layer, but the

base materials

12 and 18 may be provided in two layers. In this case, the magnetic film 10 includes, as shown in FIG. 7, a film-shaped first base material 12, a first ink receiving layer 21 laminated on one surface of the first base material 12, and a first base material 12. The magnetic layer 14 directly laminated on the other surface, the second base material 18 directly laminated on the surface of the magnetic layer 14 opposite to the first base material 12 side, and the magnetic layer on the second base material 18. The second ink receiving layer 22 is directly laminated on the surface opposite to the 14 side, and ink jet printing or offset printing is performed on each of the first ink receiving layer 21 and the second ink receiving layer 22. Various types of printing such as letterpress printing or thermal transfer printing are possible. A front side coloring layer may be provided between the first base material 12 and the first ink receiving layer 21, and a coloring layer 13 (back side coloring layer) may be provided between the second base material 18 and the second ink receiving layer 22. May be provided.

In the above-described embodiment (the magnetic film 10 in FIGS. 1, 2, and 5 to 7), the magnetic layer 14 is a layer in which magnetic material powder is dispersed in a binder such as an organic binder (hereinafter, “magnetic material powder However, a metal foil such as a steel foil or a stainless foil may be used instead. The use of the metal foil makes it easier to increase the magnetic attraction force as compared with the dispersion layer of the magnetic material powder. When a steel foil is used for the magnetic layer 14, the surface of the steel foil may be coated with anticorrosion plating (zinc plating, tin plating, etc.).

In the above-described embodiment, the multipolar magnetization is performed immediately after the coating liquid is dried in the magnetic layer forming step, but the multipolar magnetization may be performed after the formation of each

ink receiving layer

21, 22.

In the above embodiment, the magnetic layer 14 may be pressed by a nip type press roll after the magnetic layer forming step. This can improve the density of the magnetic layer 14 (improve the magnetism). In addition, it is possible to suppress the occurrence of wrinkling defects due to variations in thickness and excessive pressurization of the nip rolls. The pressure treatment conditions are preferably temperature: 60 to 80 ° C., hardness of nip rubber roll: Shore A 55 to 65 °, and linear pressure: about 200 to 400 N / cm.

In the following, for each test piece of the example and the comparative example, the bending resistance test of the A method (45 ° cantilever method) in JIS-L-1096: 2010 and the measurement of the degree of warpage after being wound in a cylinder for a long time are performed. The result of performing is explained. The present invention is not limited to the embodiments.

<Example 1>
The test piece of Example 1 is a magnetic film in which a first ink receiving layer, a base material, a magnetic layer, a coloring layer, and a second ink receiving layer are laminated in this order. The test piece of Example 1 was a magnetic film printable only on one side (a film in which a first ink receiving layer, a base material and a magnetic layer were laminated in this order. Hereinafter referred to as a "magnetic film for single-sided printing"). Was prepared, and the colored layer and the second ink receiving layer were sequentially formed on the magnetic layer of the magnetic film for single-sided printing. Two colored layers are provided. The test piece of Example 1 is provided with one base material and one magnetic layer.

<Example 2>
The test piece of Example 2 is a magnetic film in which a first ink receiving layer, a first base material, a magnetic layer, a second base material, and a second ink receiving layer are laminated in this order. For the test piece of Example 2, a magnetic film for single-sided printing is prepared, and an inkjet film (a film in which an ink receiving layer is laminated on a substrate) is laminated and adhered to the magnetic layer side of the magnetic film for single-sided printing. It was produced by The test piece of Example 2 has one magnetic layer but two base materials.

<Comparative example>
The test piece of the comparative example is a magnetic film in which a first ink receiving layer, a first base material, a magnetic layer, a magnetic layer, a second base material and a second ink receiving layer are laminated in this order. The test piece of the comparative example was prepared by preparing two magnetic films for single-sided printing and adhering the magnetic layers of the two magnetic films for single-sided printing to each other. The test piece of the comparative example is provided with two base materials and two magnetic layers.

[Bending test]
The bending resistance test was performed using the tester 30 shown in FIG. The tester 30 is a horizontal table having a 45 ° inclined surface on one side, and a scale 31 is provided on the horizontal table. In the bending resistance test, the test piece 35 (20 mm × about 150 mm) placed on a horizontal table is slid toward the inclined surface side, and when the center point of one end of the test piece 35 in the hung state contacts the inclined surface. The position was read on a scale. Thereby, the length L (FIG. 8B) of the portion of the test piece 35 extending from the horizontal base to the inclined surface side is acquired. Table 1 shows the length L obtained for each test piece of the example and the comparative example.

[Measurement of warpage of test piece wound on cylinder for a long time]
As shown in FIG. 9, the measurement of the degree of warpage was performed by maintaining a test piece 45 having a length substantially equal to the circumference of the cylinder 40 in a state in which the test piece 45 was wound around the cylinder 40 for 72 hours. 45 is placed, and the distance X at which one end in the length direction of the test piece 45 floats from the horizontal plane is measured. As the cylinder 40, two types of Φ75 mm and Φ50 mm were used. Table 1 shows the distance X measured for each test piece of the example and the comparative example.

Regarding the bending resistance test, in both Example 2 and Comparative Example, one end of the test piece 35 floated from the inclined surface even when the test piece 35 extended 150 mm from the horizontal base toward the inclined surface. Therefore, the length L in Table 1 is described as "150 mm or more". The distance at which one end of the test piece 35 floats from the inclined surface of the tester 30 was smaller in the second embodiment.

According to the result of the bending resistance test, it was confirmed that Example 1 was the most flexible. In addition, it was confirmed that Example 2 was superior in flexibility between Example 2 and Comparative Example.

Also, the results of measuring the degree of warpage of the test piece wound on the cylinder for a long time confirmed that Example 1 was the most flexible. In addition, it was confirmed that Example 2 was superior in flexibility between Example 2 and Comparative Example.

The present invention can be applied to a magnetic film or the like that is attached using magnetic force.

10 magnetic film 12 base material 13 colored layer 14 magnetic layer 18 base material 21 first ink receiving layer 22 second ink receiving layer

Claims

A magnetic layer,
A first ink receiving layer laminated on one side of the magnetic layer;
A second ink receiving layer directly laminated to the surface of the magnetic layer opposite to the first ink receiving layer side, or to the colored layer when a colored layer is laminated on the opposite surface. Equipped with
A magnetic film configured to be printable on each of the first ink receiving layer and the second ink receiving layer.
The magnetic film according to claim 1, further comprising a film-shaped substrate that is disposed between the first ink receiving layer and the magnetic layer.
The first ink receiving layer is laminated directly on the substrate,
The magnetic film according to claim 2, wherein the second ink receiving layer is directly laminated on the colored layer laminated on the surface of the magnetic layer opposite to the base material side.
The magnetic film according to claim 3, wherein the total thickness of the second ink receiving layer and the colored layer is larger than the thickness of the first ink receiving layer.
The magnetic film according to claim 3 or 4, wherein the total thickness of the second ink receiving layer and the colored layer is at least 2 μm or more.
A film-shaped first base material,
A first ink receiving layer laminated on one side of the first substrate;
A magnetic layer directly laminated on the other surface of the first substrate,
A second base material directly laminated on a surface of the magnetic layer opposite to the first base material side;
A surface opposite to the magnetic layer side of the second substrate, or, when a colored layer is laminated on the opposite surface, a second ink receiving layer directly laminated to the colored layer,
A magnetic film configured to be printable on each of the first ink receiving layer and the second ink receiving layer.