JP6955649B2 - Magnetic film - Google Patents

Description

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

Conventionally, magnetic films that can print on both the 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 in which a magnetic layer is 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 magnetic layers of the two precursors are bonded to each other by an adhesive or thermocompression bonding.

Japanese Unexamined Patent Publication No. 2014-168926

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

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 the front and back surfaces.

In order to solve the above-mentioned problems, the first invention relates 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 colored layer is laminated on the opposite surface, the colored 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. It is a magnetic film composed of.

The second invention further includes a base material formed in a film shape, which is arranged between the first ink receiving layer and the magnetic layer in the first invention.

In the third invention, in the second invention, the first ink receiving layer is directly laminated on the base material, and the second ink receiving layer is colored on the surface of the magnetic layer opposite to the base material side. It is laminated directly to the layer.

In the fourth invention, in the third invention, the total thickness of the second ink receiving layer and the colored layer is larger than the thickness of the first ink receiving layer.

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

The sixth invention comprises a film-like first base material, a first ink receiving layer laminated on one side of the first base material, and a magnetic layer directly laminated on the other side of the first base material. When the second base material directly laminated on the surface of the magnetic layer opposite to the first base material side and the colored layer are laminated on the surface opposite to or opposite to the magnetic layer side of the second base material. Is a magnetic film provided with 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 on the opposite surface, 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 the front and back surfaces, the number of layers can be reduced as compared with 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 both 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 a magnetic film capable of printing on both the front and back surfaces, the number of layers can be reduced as compared with 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 a colored layer is not provided on the back side of the magnetic layer. FIG. 3 is a cross-sectional view for explaining a method of manufacturing a magnetic film in the embodiment. FIG. 4 is a cross-sectional view for explaining a method of manufacturing a magnetic film in other embodiments. FIG. 5 is a cross-sectional view of the magnetic film according to another embodiment. FIG. 6 is a cross-sectional view of the magnetic film according to the other embodiment, which is different from that of FIG. FIG. 7 is a cross-sectional view of the magnetic film according to the other embodiment. FIG. 8 (a) is a perspective view of the testing machine used for the rigidity test, and FIG. 8 (b) is a view of the state of the rigidity test from the side of the testing machine. FIG. 9 is a diagram for explaining a method of measuring the degree of warpage of a test piece wound around a 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 applications, or its uses.

[Structure of magnetic film]
The magnetic film 10 is a magnetic composite film in which a plurality of functional layers are composited. The magnetic film 10 has flexibility and can print on both the front and back sides. Specifically, as shown in FIG. 1, the magnetic film 10 includes a film-like base material (thin layer base material) 12, a first ink receiving layer 21 laminated on one side of the base material 12, and a base material 12. The magnetic layer 14 laminated on the other side of the above, 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. Each of the first ink receiving layer 21 and the second ink receiving layer 22 can be printed by various methods such as inkjet printing, offset printing, letterpress printing, and thermal transfer printing. There is. In the following, the first ink receiving layer 21 side is referred to as "front side", and the second ink receiving layer 22 side is referred to as "back side".

In the magnetic film 10, the first ink receiving layer 21, the base material 12, the magnetic layer 14, the colored 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 colored 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, the second ink receiving layer 22 is directly provided on the opposite surface (back surface) of the magnetic layer 14 from the base material 12 side without providing the colored layer 13 on the back side of the magnetic layer 14. It may be laminated. Further, in FIGS. 1 and 2, the first ink receiving layer 21 is directly laminated on the surface of the base material 12, but a colored layer (front side colored layer) is laminated on the surface of the base material 12 and the front side thereof. The first ink receiving layer 21 can also be directly laminated on the colored layer.

The base material 12 is a flexible member having a certain thickness. As the base material 12, a colored one such as white is used, but a colorless one can also be used. The thickness of the base material 12 can be 20 μm or more and 300 μm or less, but is 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 attachment when the magnetic film 10 is attached to the adherend becomes large, and the magnetism becomes large. There is a risk of insufficient adsorption power. As the base material 12, synthetic paper, a plastic film containing an inorganic powder, water resistant paper, or the like can be used.

Examples of the synthetic paper used for the base material 12 include YUPO synthetic paper FEB, FGS, FPG, VJFP, VJFD (manufactured by Yupo Corporation), Toyojet GP, MW, MT, MP (manufactured by Toyobo Co., Ltd.), and peach coat. SPUY (manufactured by Nisshinbo Co., Ltd.) and the like can be mentioned.

Examples of the plastic film containing an 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). Examples of the water resistant paper used for the base material 12 include Eco Crystal (manufactured by Shin Tomoegawa Paper Co., Ltd.) and Careca (manufactured by Mitsubishi Chemical Media Co., Ltd.).

The magnetic layer 14 is a layer in which magnetic material powder is dispersed in a binder such as an organic binder. For the binder, for example, an organic polymer elastomer is used. The main composition of the magnetic layer 14 is a magnetic material powder and an organic polymer elastomer. When either the hard magnetic material powder or the soft magnetic material powder is used as the magnetic material powder, the organic polymer elastomer used for the magnetic layer 14 is a chlorinated polyethylene elastomer, a chlorosulfonated polyethylene elastomer, or an ethylene vinyl acetate copolymer elastomer. , Ethylene ethyl acrylate elastomer, ethylene propylene elastomer, urethane-based elastomer and the like can be used. Further, depending on the desired physical properties, a mixture thereof, or a mixture of these and plastomer (plastic) may be used as appropriate.

The magnetic layer 14 is a hard magnetic layer using a hard magnetic material powder or a soft magnetic layer using a 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 performing magnetization (magnetization) after molding the magnetic layer 14. In this case, double-sided magnetizing (for example, double-sided multi-pole magnetizing) is performed. However, single-sided magnetizing (for example, single-sided multi-pole magnetizing) may be performed. Further, although magnetization is performed so that the magnetic layer 14 has magnetic anisotropy, magnetization may be performed so that the magnetic layer 14 has magnetic anisotropy. 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, the hard magnetic material powder includes, for example, hard ferrite powder (M-type ferrite such as strontium ferrite powder and barium ferrite powder, zinc / strontium ferrite powder, zinc / barium ferrite powder, and the like. W-type ferrite) can be used. Hard ferrite powder is a magnet material powder that has a high coercive force and is a ferromagnetic material. As the hard magnetic material powder, a powder other than hard ferrite powder may be used.

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 or more and 70% by volume or less.

When the magnetic layer 14 is a soft magnetic layer, the soft magnetic material powder includes a ferromagnetic material having a low coercive force and a high penetrating magnetic force (hereinafter referred to as "ferromagnetic material powder") and a ferri magnetic material among the ferromagnetic materials. Of these, a ferromagnetic material having a low coercive force and a high penetrating magnetic force (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 steel powder, sendust powder and the like can be used. As the ferrimagnetic powder, manganese-zinc ferrite powder, nickel-zinc ferrite powder, magnetite powder = triiron tetroxide powder, which are soft ferrites, can be used.

When ferromagnetic 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 40% by volume or more and 60% by volume or less. If this 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 lowered.

When ferrimagnetic material 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 this 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 lowered.

When a mixture of ferromagnetic material powder and ferrimagnetic material powder is used as the soft magnetic material powder, a mixture of ferromagnetic material powder 25% by volume or more and 35% by weight or less and ferrimagnetic material powder 65% by volume or more and 75% by weight or less should be used. Can be done. 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 this 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 lowered.

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 is 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 becomes thick. When ferromagnetic powder is used as 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, and if it exceeds 75 μm, the performance becomes excessive and the thickness becomes thick. When ferrimagnetic powder is used as 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 thick.

Each of the ink receiving layers 21 and 22 is a coating layer that absorbs and fixes the ink that lands 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 soaked with ink are formed in the ink receiving layer. May be good.

As the ink receiving layer paint (treatment material) used for forming the water-soluble resin-based ink receiving layers 21 and 22, NS-63P (polyester resin-based, manufactured by Takamatsu Oil & Fat Co., Ltd.), NS-310X (polyurethane resin-based) , Made by Takamatsu Oil & Fat Co., Ltd.) and the like can be used. Examples of the paint for the ink receiving layer used for forming the ink receiving layers 21 and 22 of the inorganic pigment type include Pateracol IJ-150R (inorganic filler-containing urethane resin-based dispersion, manufactured by DIC Corporation), RSI-. 100 (inorganic filler-containing hybrid resin-based dispersion, manufactured by DIC Corporation), MZ-477 or MZ-480, (inorganic filler-containing acrylic resin-based dispersion, manufactured by Takamatsu Oil & Fat Co., Ltd.) and the like can be used. can.

For the first ink receiving layer 21, a paint for the ink receiving layer is selected according to the type of the base material 12 and the like. The thickness of the first ink receiving layer 21 is preferably 1 μm or more and 30 μm or less. If the thickness of the first ink receiving layer 21 is less than 1 μm, the ink receiving capacity is insufficient, and if it exceeds 30 μm, the ink receiving capacity becomes excessive, which is uneconomical.

For the second ink receiving layer 22, a paint 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. If the thickness of the second ink receiving layer 22 is less than 1 μm, the ink receiving capacity is insufficient, and if it exceeds 30 μm, the ink receiving capacity becomes excessive, which is uneconomical.

Further, when the "back side paint layer" including the second ink receiving layer 22 and the colored layer 13 is referred to, the thickness of the back side paint layer (the total thickness of the second ink receiving layer 22 and the colored layer 13) is the magnetic layer 14. It can be set to 2 μm or more (preferably 4 μm or more) in consideration of the hiding power against the light. In the case of FIG. 2, the back side coating layer is composed of only the second ink receiving layer 22. 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.

Further, when the "front side paint layer" including the first ink receiving layer 21 and the front side colored 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 made thinner while ensuring the hiding power against the magnetic layer 14.

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

[Manufacturing method of magnetic film]
The method for producing 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, respectively. Do it in order. The front 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. Each step of the manufacturing method will be described in detail below.

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

Subsequently, in the application of the coating liquid, a predetermined coating thickness is applied to the base material 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 as to become. The base material 12 coated with the coating liquid is dried in a warm air drying furnace (for example, 50 to 100 ° C. × 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, magnetization (for example, double-sided multi-pole magnetization) is performed on the base material 12 after the coating liquid is dried by a warm air drying furnace. The base material 12 before the coating liquid is dried in the 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 DC 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 is used between adjacent poles. It is preferable to perform magnetization so that the value is 0.5 or more and 3 mm or less. If the distance 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 suitable for a magnet (efficient magnetizing) is deviated.

In the paint layer forming step, the paint for the ink receiving layer is applied to the front side of the base material 12, and then the paint for the ink receiving layer is dried in a drying furnace (for example, 60 to 90 ° C. × 12 minutes). Further, after applying the paint to the back side of the magnetic layer 14, the paint is dried in a drying oven. Then, after applying the ink receiving layer paint, the ink receiving layer paint is dried in a drying oven. As a coating device used for applying 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 applied and dried on the front side of the base material 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 paint on the back side of the colored layer 13.

The order in which the paint is applied and dried 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 material may be repeatedly applied and dried to form a plurality of colored layers 13. Further, regarding the second ink receiving layer 22, when the color of the magnetic layer 14 is gray, the number of layers of the colored layer 13 can be reduced by making the colored layer 13 one layer as compared with the case where the magnetic layer 14 is black. can.

[Effects of the embodiment, etc.]
In the present embodiment, since only one base material 12 and one magnetic layer 14 are provided, the number of layers can be reduced in the magnetic film 10 capable of printing by an inkjet method or the like on both the 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 be flexible, the flexibility can be reduced 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 the manufacture, printing can be performed on both sides by an inkjet method or the like. Then, the user can select one printing surface as the front side, attach the magnetic film 10 to the adherend, and attach the other printing surface to the front side at a required timing. Therefore, it is possible to realize two printing surfaces used at different timings with 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. 4A to 4C, the formation and magnetism of the first ink receiving layer 21 are performed. The magnetic film 10 may be manufactured in the order of forming the layer 14, forming the colored layer 13 and the second ink receiving layer 22.

In the above-described 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, as shown in FIG. 5, the magnetic film 10 includes a magnetic layer 14, a first ink receiving layer 21 directly laminated on one side of the magnetic layer 14, and a first ink receiving layer 21 in the magnetic layer 14. A second ink receiving layer 22 that is directly laminated on the opposite surface to the side is provided, and each of the first ink receiving layer 21 and the second ink receiving layer 22 is printed by an inkjet method or an offset method. , Letterpress printing, thermal transfer printing, and other printing methods are possible. The magnetic layer 14 serves as a base material that supports the ink receiving layers 21 and 22. Although the colored layers 13 are not provided on the front side and the back side of the magnetic layer 14 in FIG. 5, as shown in FIG. 6, the colored layers 13 may be provided on both the front side and the back side of the magnetic layer 14. Further, 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 colors (whiteness, etc.) on the front and back can be obtained. According to the magnetic film 10 of FIG. 5 or FIG. 6, the thickness can be further reduced as compared with the above-described embodiment, and the flexibility can be further improved.

In the above-described embodiment (magnetic film 10 of FIGS. 1 and 2), one layer of the base material 12 is provided, but two layers of the base materials 12 and 18 may be provided. In this case, as shown in FIG. 7, the magnetic film 10 is composed of a film-like first base material 12, a first ink receiving layer 21 laminated on one side of the first base material 12, and a first base material 12. A magnetic layer 14 directly laminated on the other side, a second base material 18 directly laminated on the surface of the magnetic layer 14 opposite to the first base material 12 side, and a magnetic layer on the second base material 18. A second ink receiving layer 22 directly laminated on the opposite side to the 14 side is provided, and inkjet printing and offset printing are performed on each of the first ink receiving layer 21 and the second ink receiving layer 22. , Letterpress printing, thermal transfer printing, and other printing methods are possible. Note that the first substrate 12 may be provided with a front side coloring layer between the first ink receiving layer 21, the colored layer 13 (the back side coloring between the second substrate 18 and the second ink receiving layer 22 Layer) may be provided.

In the above-described embodiment (magnetic film 10 of FIGS. 1, 2, 5 and 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”. Although it is a "dispersed layer"), a metal foil such as a steel foil or a stainless steel foil may be used instead. By using the metal foil, it becomes easier to increase the magnetic adsorption force as compared with the dispersed 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 embodiment, the multi-pole magnetization is performed immediately after the coating liquid is dried in the magnetic layer forming step, but the multi-pole magnetization may be performed after the formation of the ink receiving layers 21 and 22.

In the above embodiment, the magnetic layer 14 may be pressed with a nip-type press roll after the magnetic layer forming step. Thereby, the density of the magnetic layer 14 can be improved (improvement of magnetism). In addition, it is possible to suppress the occurrence of wrinkling defects due to thickness variation and excessive pressurization of the nip roll. The pressure treatment conditions are preferably such that the temperature is 60 to 80 ° C., the hardness of the nip rubber roll is shore A 55 to 65 °, and the linear pressure is about 200 to 400 N / cm.

In the following, for each of the test pieces of Examples and Comparative Examples, the rigidity test of the A method (45 ° cantilever method) in JIS-L-1096: 2010 and the measurement of the degree of warpage after being wound around a cylinder for a long time are described. The result of the above will be explained. The present invention is not limited to the examples.

<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 colored layer, and a second ink receiving layer are laminated in this order. The test piece of Example 1 is a magnetic film that can be printed on only one side (a film in which a first ink receiving layer, a base material, and a magnetic layer are laminated in this order. Hereinafter, it is referred to as "magnetic film for single-sided printing"). Was prepared, and a colored layer and a 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 base material) is laminated and adhered to the magnetic layer side of the magnetic film for single-sided printing. It was made by. The test piece of Example 2 has one magnetic layer, but is provided with two base materials.

<Comparison example>
The test piece of the comparative example is a magnetic film in which the first ink receiving layer, the first base material, the magnetic layer, the magnetic layer, the second base material, and the 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 layers each of a base material and a magnetic layer.

[Rigidity / softness test]
The rigidity / softness test was performed using the testing machine 30 shown in FIG. 8 (a). The testing machine 30 is a horizontal table having an inclined surface of 45 ° on one side, and the horizontal table is provided with a scale 31. In the rigidity test, the test piece 35 (20 mm × about 150 mm) placed on a horizontal table is slid toward the inclined surface, and the center point of one end of the hanging test piece 35 comes into contact with the inclined surface. The position was read on a scale. As a result, the length L (FIG. 8 (b)) of the portion of the test piece 35 extending from the horizontal table 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 a test piece wound around a cylinder for a long time]
As shown in FIG. 9, the degree of warpage is measured on a horizontal surface after a test piece 45 having a length substantially equal to the circumference of the cylinder 40 is maintained around the cylinder 40 for 72 hours. 45 is placed, and the distance X at which one end in the length direction floats from the horizontal plane in the test piece 45 is measured. Two types of cylinder 40, 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 rigidity test, in both Example 2 and Comparative Example, one end of the test piece 35 was floating from the inclined surface even when the test piece 35 extended 150 mm from the horizontal table to the inclined surface side. 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 testing machine 30 was smaller in Example 2.

According to the result of the rigidity test, it was confirmed that Example 1 was the most flexible. Further, in Example 2 and Comparative Example, it was confirmed that Example 2 was more flexible.

In addition, it was confirmed that Example 1 had the highest flexibility from the results of measuring the degree of warpage of the test piece wound around the cylinder for a long time. Further, in Example 2 and Comparative Example, it was confirmed that Example 2 was more flexible.

The present invention can be applied to a magnetic film or the like to be attached by utilizing 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 (10)

A magnetic layer forming step of forming a magnetic layer by applying a coating liquid for a magnetic layer to one side of a base material composed of a film.
After the magnetic layer forming step, the first ink receiving layer is formed by applying the paint for the ink receiving layer to the other surface of the base material, and the surface of the magnetic layer opposite to the first ink receiving layer is formed. On the other hand, after the colored layer is formed by directly applying the paint for the colored layer, the paint layer for forming the second ink receiving layer is formed by directly applying the paint for the ink receiving layer to the colored layer. Do the process and
A method for producing a magnetic film, which comprises providing one layer each of the magnetic layer and the base material between the first ink receiving layer and the second ink receiving layer to produce a magnetic film . In the magnetic film produced by the production method, the first ink receiving layer is directly laminated on the substrate, a manufacturing method of the magnetic film according to claim 1. The The magnetic film produced according to the production method, wherein the substrate, the is directly laminated on one side of the magnetic layer, the manufacturing method of the magnetic film according to claim 1 or 2. In the magnetic film produced by the production method , any one of claims 1 to 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 method for producing a magnetic film according to. In the magnetic film produced by the production method, the total thickness of the second ink receiving layer and the colored layer is at least 2μm or more, a manufacturing method of the magnetic film according to any one of claims 1 to 3 .. In the magnetic film produced by the production method, the between the magnetic layer and the second ink receiving layer, a plurality of colored layers is provided, the manufacturing method of the magnetic film according to claim 1. A magnetic layer forming step of forming a magnetic layer by applying a coating liquid for a magnetic layer to one side of a base material composed of a film.
After the magnetic layer forming step, the first ink receiving layer is formed by applying the paint for the ink receiving layer to the other surface of the base material, and the surface of the magnetic layer opposite to the first ink receiving layer is formed. On the other hand, a paint layer forming step of forming a second ink receiving layer by directly applying the paint for the ink receiving layer is performed.
A method for producing a magnetic film, which comprises providing one layer each of the magnetic layer and the base material between the first ink receiving layer and the second ink receiving layer to produce a magnetic film . The method for producing a magnetic film according to claim 7, wherein in the magnetic film produced by the production method, the first ink receiving layer is directly laminated on the base material . In the magnetic film produced by the production method, the thickness of the second ink receiving layer is larger than the thickness of the first ink receiving layer, a manufacturing method of the magnetic film of claim 7. In the magnetic film produced by the production method, the magnetic layer is a metal foil, a manufacturing method of the magnetic film according to any one of claims 1 to 9.

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