JP6266476B2 - Magnet film and magnet film card using the same - Google Patents

Description

  The present invention provides a magnetic film in which a magnetic coating material comprising a hard magnetic material powder, an organic polymer elastomer as a binder and a solvent as main components is applied to one side of a support and dried to form a magnetic coating film. The present invention relates to a magnetic film formed by multipolar magnetization. Thus, the magnetic film is used for a display on a bulletin board, a cover on a room wall surface, various cards and the like.

A magnetic film in which a magnetic layer is formed using a conventional magnetic paint, the magnetic paint is applied to one side of the support, and the axis of easy magnetization of the anisotropic hard magnetic material powder is parallel to the support surface (in-plane direction) Are magnetically oriented.
In order to perform multipolar magnetization on the magnetic film, the magnetic pole direction of the multipolar magnetization is perpendicular to the orientation direction of the easy magnetization axis of the anisotropic hard magnetic material powder so that the direction of the magnetic flux is the easy magnetization axis direction. It is an indispensable condition to be magnetized. However, it is very inconvenient that the magnetic pole direction cannot be changed depending on the application. Prior art documents include the following patent documents, but all use the in-plane orientation technique.

Patent No. 1460017 JP 2001-76920 A Japanese Patent No. 3271620 Japanese Patent No. 3297807 Japanese Patent No. 3309854 Patent No. 3309855 Japanese Patent No. 3326690 Patent No. 3429503

  Conventional anisotropic magnet films have a strong magnetic attraction compared to thin-layer magnets, and since they are thin layers, they are said to be easy to print and lightweight and have excellent handling properties. At times, as the application expands, it is considered as a problem that it is difficult to align the four corners by magnetically adhering the front and back to touch when multiple sheets are cut into a standard size and handled in layers. It came to be strongly demanded. The present invention solves this problem.

  As a result of various investigations to solve the above problem, when the magnetic sheets (cards) cut to a fixed size overlap each other, the magnetic pole directions overlap when both are in the same pole, Or, against the inconvenience that magnetic attraction force occurs between the back surfaces or between the front and back surfaces, magnetizing by randomly changing the poles of multipolar magnetization, and crossing the magnetic pole directions of both In addition, the effect of reducing the magnetic attractive force between the front and back sides of the magnetic poles is further improved by randomly changing the poles of multipolar magnetization and crossing the magnetic pole directions.

  In addition, by applying magnetization with randomly changing the magnetic pole direction of multipolar magnetization, the magnetic attraction force is changed from the state in which the magnet films are magnetically attracted obliquely along the magnetic pole by the magnetic attraction force with different polarities. In order to prevent deformation and scratches caused by impacts, etc., a support (film) should be provided on both sides of the magnet film in order to prevent the deformation and scratches caused by impact etc. And the occurrence of wave deformation (FIG. 15) due to magnetic attraction between adjacent different poles when magnetizing by randomly changing the poles of multipolar magnetization. It has been found that the effect is large (FIG. 16), and that it has the effect of reducing the magnetic attractive force between the two as a whole.

  In addition, one side of a rectangular standard product is cut at an arbitrary angle within a predetermined range with respect to the magnetic field orientation direction so that the magnetic pole directions intersect with each other, so that the original fabric is within the predetermined range. The present invention has been completed by paying attention to the fact that it is the same as that obliquely magnetized at an arbitrary angle (FIG. 17).

(1) Mainly made of polyethylene terephthalate-based synthetic paper with an anisotropic ferrite-based hard magnetic material powder as a magnetic paint and an organic polymer elastomer-based varnish as a binder on one side of a support having a thickness of 40 to 220 μm. The filling amount of the anisotropic ferrite hard magnetic material powder is 50 to 65 volumes with respect to the total amount of the anisotropic ferrite hard magnetic material powder, the organic polymer elastomer and the processing aid, which are solid components after drying. % Is applied so that the thickness after drying is 40 to 250 μm, and the axis of easy magnetization of the anisotropic ferrite-based hard magnetic material powder is aligned in the in-plane magnetic field in the direction parallel to the support surface and dried to form a magnetic coating film. a magnetic film obtained by forming a
Magnetic layer between bonded to it as a magnetic film having a support on both sides to grant seaworthiness droplet deformation adsorptive and耐角end deformation of the laminate or magnetic film similar to the film and support,
The magnetic pole direction on one side or both sides with respect to the magnetic orientation direction, it was subjected to magnetization randomly distance between the poles of the multipolar magnetized in a direction perpendicular, the magnetic attraction force of the magnet between films during handling Reduced magnet film , evaluated by the following undulation deformation adsorption test and corner end deformation test: Excellent undulation deformation adsorption and corner end deformation conforming to ◎ The magnetic film is a feature.

1. Anti-waving deformation adsorption test method
Two magnetic films, which are test samples (100 × 150 mm), are overlapped, and after standing for 7 days in a hot-air circulating thermostatic device at 38 to 42 ° C., the presence or absence of undulation deformation adsorption is observed and evaluated in four stages. . )
◎: No undulations are observed. ○: Most undulations are not observed. △: Some undulations are observed.
2. Corner edge resistance test method
At a room temperature of 21 to 25 ° C., two magnetic film cards, which are test samples (100 × 150 mm), are first stacked, and the angle at which the magnetic attractive force between the cards becomes maximum within a magnetic pole direction of 360 ° ( The front and back sides are magnetically attracted with the magnetic pole directions overlapping. In addition, in order to align the irregular cards in which a total of 10 cards were stacked in the same manner sequentially against the magnetic attractive force, the alignment was repeated three times by placing the four sides one by one against the flat surface of the table. Then, the four-level evaluation is performed by visually observing the deformation of the corner ends and the degree of scratches.
◎: Deformation is not recognized ○: Deformation is hardly recognized Δ: Deformation is slightly recognized
X: Deformation is recognized.

(2) The distance between the poles of the multi-pole magnetization is the distance between the poles suitable for the thickness of the magnet film, and the distance between the reference poles is 5 units. There is one pole between the poles each having a dimension of 0.8, 0.9, 1.0, 1.1, and 1.2, and magnetization is random within each unit in which the order is continuous. The magnetic film is characterized by being applied.

(3) Mainly made of polyethylene terephthalate-based synthetic paper with an anisotropic ferrite-based hard magnetic material powder as a magnetic paint and an organic polymer elastomer-based varnish as a binder on one side of a support having a thickness of 40 to 220 μm. 50 to 65 volume of anisotropic ferrite hard magnetic material powder with respect to the total amount of anisotropic ferrite hard magnetic material powder, organic polymer elastomer, and processing aid as solid components after drying Is applied so that the thickness after drying becomes 40 to 250 μm, and the axis of easy magnetization of the anisotropic ferrite-based hard magnetic material powder is aligned in the in-plane magnetic field in the direction parallel to the surface of the support, and then dried and magnetically coated. To a magnetic film formed by forming a film ,
Magnetic layer between bonded to it as a magnetic film having a support on both sides to grant seaworthiness droplet deformation adsorptive and耐角end deformation of the laminate or magnetic film similar to the film and support,
The magnetic pole direction is magnetized on one side or both sides of the magnetic field in the direction perpendicular to the direction of the magnetic field, and the distance between each pole of the multipolar magnetization is magnetized at equal intervals. The direction of the magnetic field is 10 to 80 degrees or minus 10 to 80 degrees with respect to the magnetic field orientation direction and is cut by providing an arbitrary inclination, thereby reducing the magnetic attractive force between the magnet films during handling , evaluation in耐耐angle end modified test method according to claim 1: ◎ and Blank magnet film characterized indicia that excellent compatible 耐角end deformability on.

(4) Using the magnet film according to any one of (1) and (2) above, the square cut is made 10 to 80 degrees with respect to the magnetic field orientation direction with respect to the direction of the vertical or horizontal side of the square. by cutting with an optional inclination in a range of minus 10 to 80 degrees, more and Blank magnet film of the item (2), wherein the reduced magnetic attraction force between the magnet film.

(5) The amount of ferrite hard magnetic material powder in the magnetic coating film is 50 to 65 v%, and the thickness of the magnetic coating film is 40 to 250 μm. The magnetic film according to any one of the items (1) to (4), wherein the magnet film is subjected to multipolar magnetization.

(6) The support of the magnetic film having the support on both sides is a polyethylene terephthalate synthetic paper having a thickness of 40 to 60 μm, a magnetic coating film thickness of 80 to 100 μm, a magnetic adsorption force of 0.5 to 2.0 g / cm ² , The magnet film according to any one of (1) to (5) above, having a self-weight of 480 g / m ² or less.

(7) The magnetic film according to any one of (1) to (6), wherein the non-coated surface of the support is a printable or erasable surface.

(8) A magnetic film card using the magnetic film according to any one of (1) to (7).

  The present invention randomizes the distance between each pole of multipolar magnetization as a measure for reducing the mutual magnetic attraction force by superimposing a card using a magnetic film subjected to multipolar magnetization. Or the problem caused by crossing the magnetic poles is solved.

  That is, in order to reduce the magnetic attraction force by randomizing the distance between each pole of multipolar magnetization or by crossing the magnetic poles, it is possible to resist the magnetic attraction force by providing supports on both sides. As a result, it is possible to prevent the magnet film from being deformed or damaged by end impacts that align the four corners, automatic feeders, etc. The effect of reducing the magnetic attraction force is improved. That is, the mutual magnetic attractive force at the time of overlapping is weak and easy to handle, and the effect of preventing deformation and scratching of the magnet film can be obtained.

It is a cross-sectional schematic diagram which shows the basic composition of this invention. (A) shows that a magnetic layer in which magnetic powder is oriented in the plane is formed on one side of the support, and then a film similar to the support is laminated, and (b) shows the support as another method. It is a cross-sectional schematic diagram which shows that after forming the magnetic layer by which the magnetic powder was in-plane-oriented on one side of this, the magnetic layer surfaces were bonded together. It is a cross-sectional schematic diagram which shows the precursor of the said FIG. (A) corresponds to (a) in FIG. 1, and (b) corresponds to (b) in FIG. It is a side surface schematic diagram which shows an example of the coating device (coater) which attached the magnetic field orientation apparatus. It is a side surface schematic diagram which shows a magnetic field orientation apparatus. It is a schematic diagram (perspective view) showing one anisotropic ferrite particle that is magnetically oriented in the in-plane direction in the magnetic layer. It is a side surface schematic diagram which shows an example of a dry laminator. It is a side surface schematic diagram which shows an example of a thermal laminator. Schematic diagram (perspective view) showing a state in which the magnetic flux from the magnetizing yoke is in the easy axis (C) direction for one anisotropic ferrite particle that is magnetically oriented in the in-plane direction in the magnetic layer. It is. It is a schematic diagram which shows an example of a permanent magnet type | mold magnetizing roll, (a) is a perspective view, (b) is a side view. It is a side surface schematic diagram which shows an example which forms and magnetizes the magnetic flux of an in-plane direction using two permanent magnet type | mold magnetizing rolls. It is a top view which shows the state which magnetized between the magnetic poles given to the magnet film of this invention at random. It is the cross section (side surface) schematic diagram which magnetized similarly to between the magnetic poles (equal intervals) of the conventional magnet film. It is a cross-sectional (side) schematic diagram showing a state in which two magnetized magnets in the same manner as between the magnetized magnetic poles (equal intervals) of a conventional magnet film are magnetically attracted by contacting the magnetized surface and the back surface (non-magnetized) is there. It is a cross section (side surface) schematic diagram which shows the state which two sheets which magnetized between the magnetic poles given to the magnet film of this invention at random were touched and magnetically attracted, (a) is a magnetized surface and a back surface (B) shows a state in which the magnetized surfaces are in contact with each other and magnetically adsorbed. It is a conceptual schematic cross section which shows partial adsorption | suction among the waves produced when the surface and back surface of magnet films which provided the support body on the surface (one side) were piled up and made to magnetically adsorb | suck. (Description of the opposite magnetic pole not directly involved in the magnetic adsorption of the two is omitted) It is a conceptual schematic cross section which shows the magnetic attraction | suction state which does not produce partial adsorption | suction among waves, when the magnetic film which provided the support body on both surfaces overlap | superposed and adsorb | sucked magnetically. (Description of the opposite magnetic pole not directly involved in the magnetic adsorption of the two is omitted) It is an upper surface schematic diagram which shows providing with inclination with respect to the magnetic field orientation direction which is a fixed-length magnet film of this invention, and cutting. It is a schematic top view showing the reason why the magnetic attractive force is weakened when the magnetized surface and back surface (non-magnetized) of two magnet films subjected to multipolar magnetization overlap each other in the magnetic pole direction, (A) shows the state of intersection, and (b) is a partially enlarged view of the intersection. BRIEF DESCRIPTION OF THE DRAWINGS It is a front schematic diagram which shows the case where many magnet film cards of this invention are piled up, and arrange | positions four rounds, (a) is a schematic diagram which hits a flat surface 18 and aligns a lower end part, (b) shows the state which arranged. It is a conceptual schematic diagram (front) which shows the perpendicular direction magnetic attraction force measuring apparatus of a magnet film and a soft iron plate. It is a conceptual diagram (front) which shows the tensile shear magnetic attraction force measuring apparatus of magnet films.

Hereinafter, the form for implementing this invention is demonstrated based on FIGS.
(1) FIG. 1 is a schematic cross-sectional view showing the basic structure of a magnet film A of the present invention. (A) shows that a magnetic layer 2 in which magnetic powder is oriented in-plane on one side of a support 1 is formed by coating, and then a multi-pole magnetization is applied to one side of a magnetic film in which a film 11 similar to the support is laminated. (B) shows a magnetic film 2 in which magnetic powder is oriented in-plane on one side of the support 1 as an alternative method. It is a cross-sectional schematic diagram which shows magnet film A1 which formed multipolar magnetization on the single side | surface of the magnetic film formed by bonding together magnetic surfaces after forming (it does not display the weak magnetic pole produced on a non-magnetized surface).

(2) FIG. 2 is a schematic sectional view showing a precursor of the magnet film A shown in FIG. (A) corresponds to (a) in FIG. 1, and shows a precursor B in which a magnetic layer 2 in which magnetic powder is in-plane oriented is formed on one side of a support 1 by coating, and (b) in FIG. Corresponding to (b), a precursor B1 formed by coating and forming a magnetic layer 2 having a magnetic powder of in-plane orientation, which is half the thickness of the magnetic layer of the target magnetic film, on one side of the support 1 Show. After the precursor B1 is magnetized from the support side, the magnet surfaces are bonded to each other to obtain a double-sided magnetized product having the same magnetic attraction force on both sides.

  Examples of the support 1 include a synthetic paper having a printable layer on the surface (not shown of the printable layer, the same applies hereinafter), a plastic film containing an inorganic powder, water-resistant paper, and the like. Among them, the tensile elastic modulus is 3200 to 4200 MPa. (JIS K7127) is preferred. The printable layer means a printing ink receiving layer suitable for the purpose of use.

  Examples of synthetic paper include YUPO synthetic paper FEB, FGS, FPG, VJFP, VJFD, etc. (manufactured by Yupo Corporation), Toyojet GP, MW, MT, MP, etc. (manufactured by Toyobo Co., Ltd.), Peach Coat SPY, (Nisshinbo Co., Ltd.) Among them, Toyojet MW, MT (manufactured by Toyobo Co., Ltd.) and Peach Coat SEY (Nisshinbo Co., Ltd.), which are PET (polyethylene terephthalate) synthetic paper, are preferred.

  Examples of the plastic film containing inorganic powder include polyester films / Chrispar G2311, K1212, 2323, K2411 (Nisshinbo Co., Ltd.), semi-rigid vinyl chloride film 10P (Riken Technos), etc. Crystal (manufactured by Shinyodogawa Paper Co., Ltd.), Kaleka (manufactured by Mitsubishi Chemical Media Co., Ltd.) and the like can be mentioned.

  The thickness of the support having a printable layer on the surface is preferably 40 to 220 μm. If the thickness is 40 μm or less, the end of the magnetic film is not damaged or the wavy deformation due to partial magnetic adsorption is prevented, and the color hiding power of the formed magnetic layer is insufficient. If it is thicker than 220 μm, the magnetic air gap (distance between the magnet's magnetic attracting surface and the adherend (magnetic material) surface) will become a magnetic adhesion, and the decrease in magnetic attraction force cannot be ignored. .

  The ink receiving layer may be selected from a grade suitable for printing methods (offset printing, letterpress printing, ink jet printing, thermal transfer printing, etc.) for synthetic paper, and plastic films containing inorganic powders are known for printing methods. The ink receiving layer may be applied.

  The magnetic layer 2 in which the magnetic powder is oriented in the plane has a composition mainly composed of anisotropic ferrite hard magnetic material powder and organic polymer elastomer, and anisotropic ferrite hard magnetic material powder includes strontium ferrite and barium. M-type ferrites such as ferrite are suitable.

  The content of the magnetic material powder with respect to the total amount of the magnetic layer is preferably 50 to 65% by volume, and if it is less than 50% by volume, the magnetic attractive force obtained may be insufficient, and if it exceeds 65% by volume, the coating processability decreases. Therefore, it is not preferable.

  Examples of the organic polymer elastomer include an ethylene vinyl acetate copolymer elastomer, an ethylene ethyl acrylate elastomer, an ethylene propylene elastomer, a urethane elastomer, and the like, and a mixture thereof and a plastomer (plastic) as appropriate depending on desired physical properties. Can be used.

For the preparation of the coating liquid, a varnish obtained by dissolving the organic polymer elastomer in an organic solvent, or an emulsion and magnetic material powder which are stirred and mixed and then dispersed using a bead mill is used.
Next, after adjusting the viscosity to a viscosity suitable for the coater to be used (the one dissolved in the organic solvent is an organic solvent and the emulsion is diluted with water), a filtration treatment for removing foreign matters is performed.

  The thickness of the precursor magnetic layer shown in FIG. 2 is preferably 50 to 150 μm in (a), and if it is less than 50 μm, the performance may be insufficient, and if it exceeds 150 μm, in addition to excessive performance, avoid increasing the thickness. This is not preferable. In (b), 25 to 75 [mu] m is preferable, and if it is less than 25 [mu] m, the performance may be insufficient. If it exceeds 75 [mu] m, in addition to excessive performance, it is not preferable because the thickness is not increased.

  Further, the magnetic layer of the precursor can be smoothed and the density of the magnetic layer can be improved (improvement of magnetism) by applying pressure with a nip type press roll after coating and molding. And it is more effective to apply to the precursor than after pasting, and there is less possibility of causing flaws due to thickness variation and excessive pressurization of the nip roll.

This prevents the magnetic attraction force from being lowered due to the displacement of the magnetized magnetic powder due to the pressurization deformation at the time of laminating the magnetic layers (by applying the pressure treatment before applying the magnetization).
The pressure treatment conditions are preferably a temperature of 60 to 80 ° C., a hardness of the nip rubber roll: Shore A of 55 to 65 °, and a linear pressure of about 200 to 400 N / cm.

(3) FIG. 3 is a schematic side view showing an example of a coater MC provided with an in-plane orientation magnetic field device MM for coating and forming a magnetic layer. The support 1 is supplied from the unwinder 7 to the comma coater head. It is applied to the upper surface, and is magnetically oriented by an in-plane orientation magnetic field device MM installed at the entrance of the drying furnace 4. When it leaves the drying furnace, it is pressurized with the nip roll 5 and then cooled with the cooling roll 6, and the precursor B or B 1 is wound up by the winder 8.

  In addition to the above, the coating can be performed by a known method such as a blade coater, a bar coater, a comma coater, a gravure coater, a roll coater, or a reverse roll coater.

(4) FIG. 4 is a conceptual schematic diagram of the in-plane orientation magnetic field device MM. A magnetic flux in the M direction is obtained by confronting the permanent magnet 9, and a guide roll 14 is provided so as to pass through this position. This indicates that the magnetic powder in the magnetic layer (magnetic coating material) applied to the support 1 is oriented with the easy axis of magnetization (crystal C-axis direction) aligned in the M direction. That is, the product flow direction F, the in-plane orientation magnetic flux direction M, and the easy magnetization axis direction C are the same.

(5) FIG. 5 shows the magnetization of the anisotropic ferrite particles (average particle diameter of about 1.0 to 1.5 μm) 10 contained in the magnetic layer by the magnetic flux M in the in-plane direction of FIG. It is a conceptual schematic diagram which shows that the easy axis C is orientated in the same direction.

(6) FIG. 6 is a schematic side view showing an example using a dry laminator. The film 1-1 similar to the support or the precursor B1 is unwound from the unwinder 7, and the adhesive is used with the gravure coater 11. This magnetic film (magnet) obtained by drying in the drying furnace 4 and then being bonded to the precursor B or B1 supplied from the unwinder 7 by the heating nip roll 5 and cooled by the cooling roll 6 It shows that the non-magnetized product of the film is wound by the winder 8.

  The adhesive used for the dry lamination is preferably an adhesive that can be reheated by reheating at the time of lamination after coating and drying, or an adhesive (contact type) that can be immediately bonded at the time of lamination. Examples of heat-reactive adhesives include water-based urethane resin adhesives such as Konishi Bond CU3 (manufactured by Konishi Bond), Hydran HW-311 (manufactured by DIC Graphics), WA-374 (manufactured by Dainichi Seika). Solvent type rubber-based chloroprene-based cemedine GF (made by Cemedine), resin-based polyester-based R820 (made by Cemedine), and polyester-based urethane Crisbon 4070 (made by DIC Graphics).

  For adhesives (contact type), emulsion type acrylic resin-based AQUATEX AP-25 (manufactured by Chuo Rika Kogyo Co., Ltd.), solvent type silyl group-containing special polymer Super X (manufactured by Cemedine) .

  The adhesive layer may be obtained by applying and drying an adhesive by a known method such as a blade coater, a bar coater, a comma coater, a gravure coater, a roll coater, and a reverse roll coater so as to be about 1 to 4 μm (dry).

  The conditions of the heated nip type press roll differ depending on the adhesive, but the approximate heating temperature: 70 to 90 ° C. (No heating is required when using an adhesive), the hardness of the nip rubber roll: Shore A 55 to 65 °, line Pressure: about 100 to 300 N / cm is desirable.

(7) FIG. 7 is a schematic side view showing an example using a thermal laminator, and the magnetic layers can be bonded together by thermocompression bonding without using an adhesive for bonding the precursors together.
The precursor B1 is heated by the heating roll 13 from the upper and lower unwinding machines 7, and then bonded by the nip roll 5 and then the cooling roll 6 is wound, and the magnetic film (unmagnetized product of the magnet film) is wound by the winder 8. Indicates.

  The organic polymer elastomer used for the magnetic layer in this case is preferably a varnish or emulsion composed of an organic solvent and a chlorosulfonated polyethylene elastomer, an ethylene vinyl acetate copolymer elastomer, an ethylene ethyl acrylate elastomer or the like having excellent thermocompression bonding properties. .

  The thermocompression bonding conditions of the heated nip type press roll depend on the heat sensitivity of the organic polymer elastomer that is the binder of the magnetic layer, but the heating temperature is 80 to 90 ° C., the hardness of the nip rubber roll is Shore A 55 to 65, ° Linear pressure: about 200 to 400 N / cm is desirable.

(8) FIG. 8 shows that the anisotropic ferrite powder 10 contained in the magnetic layer is oriented with the easy axis C in the same direction by the magnetic flux M in the in-plane direction of FIG. It is a conceptual schematic diagram which shows the direction of the magnetic flux for magnetizing (magnetizing) magnetic powder.

(9) FIG. 9 shows an example in which single-sided magnetization is performed using a known permanent magnet type magnetizing roll. (A) is a perspective view, (b) is a side view, and shows that an external leakage magnetic flux MB1 from the N pole to the S pole is generated. Magnetization is performed by passing the magnetic film through about one third of the circumference of the magnetizing roll. And since the magnetic pole direction of the magnetizing roll is perpendicular to the in-plane orientation direction (the flow direction of the magnetic film), a magnet with a good magnetizing efficiency can be obtained.

(10) FIG. 10 is a conceptual schematic diagram showing that two known permanent magnet type magnetizing rolls are used to obtain the magnetic flux MB in the in-plane direction, and the magnetizing rolls are opposed to each other and obtained by homopolar repulsion ( Side view) and corresponds to MB in FIG. By this method, the same magnetization can be applied to both sides.

  Magnetization can also be performed by a magnetizing method comprising a known high-voltage pulse current generator and a one-turn magnetizing yoke. However, if the magnetic film is thin and the distance between the poles is small, the permanent magnet type magnetizing roll method is preferred. Is preferred.

  For multipolar magnetization, it is preferable to apply multipolar magnetization of 0.5 to 3 mm between poles. However, it is difficult to produce a magnetizing yoke or a magnetizing roll if the distance between poles is 1 mm or less. This is not preferable because it deviates from the range between the poles suitable for the magnet (efficient magnetization).

(11) FIG. 11 is a top view showing a state in which the magnetic poles applied to the magnet film of the present invention are randomly magnetized.

(12) FIG. 12 is a schematic cross-sectional view showing magnetization (magnetic poles are equally spaced) of a conventional magnet film, where n is the N pole of the non-magnetized surface, and s is the S pole of the non-magnetized surface. N indicates the N pole of the magnetized surface, and S indicates the S pole of the magnetized surface, but between each of the magnet poles (d1, d2, d3, d4, d5, d6, d7, d8, d9) is uniform.

(13) FIG. 13 shows that the conventional magnet films are non-magnetized and magnetized surfaces, and the center line of the N pole and the center line of the s pole, and the center line of the S pole and the center line of the n pole match. It shows the adsorbed state.
As described above, in the multipolar magnetization of the conventional magnet film, since the distance between the poles is uniform, the magnet films are in contact with each other between the non-magnetized surface and the magnetized surface or between the magnetized surface and the magnetized surface. In such a case, magnetic adsorption is performed between Sn and Ns or between SN and NS due to different polar attraction, which is inconvenient in some cases.

(14) In order to inhibit the phenomenon, if the distance between the respective poles is made non-uniform, the opposing NS position does not come on the center line of the pole, so that magnetic attraction can be inhibited.
FIG. 14 (a) shows that the magnetic films A2 and A2 of the present invention have a non-magnetized surface and a magnetized surface, and an N-pole center line and an s-pole center line, and an S-pole center line and an n-pole center line. It shows a state that does not match.
In this state, the adsorptive power is remarkably reduced, so there is no fear of inconvenience.
FIG. 14B shows a state in which the magnet films A2 and A2 are magnetized surfaces and the center line of the N pole and the center line of the S pole do not match the center line of the S pole and the center line of the N pole. It is shown.
Even in this state, the attractive force is remarkably lowered, so there is no fear of inconvenience.

  Between the poles of the magnet film, the dimension between the poles suitable for the thickness is set as the gap between the reference poles, the dimension between the reference poles × (4 to 6) is taken as one unit, and the gap between the reference poles per unit is 0.8. There are 4 to 6 magnetic poles in the range between 0.9, 1.0, 1.1, and 1.2 poles, and multipole magnetization is random in each unit in which the order is continuous. More preferably, the dimension between the reference electrodes × 5 is one unit, and the distance between the reference electrodes × 0.8, 0.9, 1.0, 1.1, 1.2 is determined for each unit. One is each, and a total of five are present, and multipolar magnetization is random within each unit in which the order is continuous. For example, in the case of 2 mm between the reference electrodes, the unit size is 10 mm, and there is one each between 1.6 mm, 1.8 mm, 2.0 mm, 2.2 mm, and 2.4 mm, Multipolar magnetization in which the order is random and the order within each successive unit is random. For example, when one unit is represented by “”, “1.6 mm, 2.0 mm, 2.4 mm, 1.8 mm, 2.2 mm” “2.0 mm, 2.4 mm, 1.8 mm, 2 .2 mm "..., The order of the magnetic poles in each unit is random.

When one unit is between the reference poles x 4, there are four gaps between the reference poles x 0.8, 0.9, 1.1, and 1.2, for a total of 4 x reference gaps x 6 In the case of, there are a total of 6 between the reference poles × 0.8, 0.9, 1.1 and 1.2, one between each and the reference gap × 1.0 You can do it.
In addition, if one unit is smaller than the standard gap x 4 dimensions, the degree of freedom to make the gap between the poles is less, and if one unit is larger than the standard gap x 6, the gap between the same dimensions increases and the gap between This is not preferable because it causes a decrease in randomness.
In addition, it is preferable that the dimension between the magnetic poles is a reference inter-electrode interval × (0.8 to 1.2) because it does not deviate from the range between the inter-electrode electrodes suitable for the thickness.

  The random method between magnetic poles can be implemented by specifying the distance between each pole in the form of a multi-pole magnetized roll using a conventionally known permanent magnet. There is an advantage that can be. Then, when cutting a magnetic card from a wide and long magnetized raw material, it is necessary to first cut into a strip shape in the longitudinal direction of the magnetic card in the horizontal direction of the original material, and then cut in the horizontal size of the magnetic card. . In this case, the magnetic pole pattern of the magnetic card manufactured from what was cut into each band shape is started by starting the discarding of the first end portion after randomly cutting it within a range of about 10 times the standard magnetic pole dimension. There is almost no coincidence with the magnetic pole pattern of other cards (a combination that does not produce an attractive force reduction effect).

(15) FIG. 15 is a conceptual schematic cross-sectional view showing the partial adsorption of the wave generated when the front and back surfaces of the magnet films A4-1 provided with a support on the front surface (one surface) are overlapped. (Description of the opposite magnetic pole not directly involved in the magnetic adsorption of the two is omitted)
A flexible magnet film (a binder is made of an organic polymer elastomer) provided with a support only on the surface (one side) is sometimes corrugated by a magnetic attraction force with a different polarity that opposes the temperature and time. There is an inconvenience of deformation and partial magnetic adsorption.

(16) FIG. 16 is a conceptual schematic cross-sectional view showing a weak magnetic adsorption state that does not cause partial adsorption of waves when the front and back surfaces of the magnet films A2 provided with supports on both sides of the present invention are overlapped. . (Description of the opposite magnetic pole not directly involved in the magnetic adsorption of the two is omitted)
By having the support on both sides, it has moderate flexibility and maintains a weak magnetic adsorption state that does not cause wavy partial adsorption against the magnetic attractive force with the opposite polarities. The same applies to the case where the surfaces of the magnet films are stacked.

(17) FIG. 17 is a schematic top view showing that the regular magnet film of the present invention is cut with an inclination with respect to the magnetic field orientation direction.
Magnetization of an anisotropic magnet film with in-plane magnetic field orientation in the magnetic field orientation direction (manufacturing flow direction) is a direction perpendicular to the magnetic field orientation direction (manufacturing flow direction). It is an essential condition, and, of course, in order to magnetize with an inclination with respect to one side of the fixed magnet film, the non-magnetized fixed magnet film is aligned with respect to the polar direction of the magnetized yoke. Even if it is supplied to the magnetizer so that one side is inclined, normal magnetization cannot be performed.

  Therefore, according to the present invention, by using a magnet sheet magnetized in a direction perpendicular to the magnetic field orientation direction (manufacturing flow direction), the direction of the magnetic poles of multipolar magnetization is provided with an inclination and cut. Show you get.

FIG. 18 is a schematic diagram for explaining a reduction in the attractive force when a non-magnetized surface and a magnetized surface are overlapped using a magnetic card produced using a magnetic film that is tilted and magnetized. 18A shows a plan view, and FIG. 18B shows an enlarged view of the minimum unit.
As shown in these figures, magnetic poles s and n having an inclination angle E are formed on the non-magnetized surface of the magnetic card, and magnetic cards magnetized at different inclination angles F with respect to the surface are provided. When placed, they overlap at the intersection angle represented by G.
Incidentally, in the current drawing, the inclination angle E is 30 ° (non-magnetized surface), the inclination angle F is 60 ° (magnetized surface), and the intersection angle G is 30 °.

  Then, as shown in FIG. 18B, there are four magnetic adsorption states in this state by crossing the pair of magnetic poles of gradient magnetization, that is, the N pole, the S pole, the n pole, and the s pole. Blocks “V (N, n same polarity repulsion), W (S, s same polarity repulsion), Y (N, s different polarity suction), Z (S, n different polarity suction)” having the same shape and area are formed. Since two repelling blocks and two blocks attracting different poles are used, the magnetic attractive force is substantially offset, and the magnetic cards have a large number of relationships as shown in FIG. 18 (a). Similarly, the magnetic attractive force is substantially canceled (reduced magnetic attractive force).

  This effect can be achieved as long as the crossing angle G is not 0 or very small. Therefore, as long as the conditions are within the range, the inclination angle E and the inclination angle F can be implemented by other than the above numerical values. Needless to say. In addition, this phenomenon and the effect are similarly generated even when the magnetized surfaces are overlapped with each other.

Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited thereto.

(1) Preparation of precursor 1) Support: Polyester synthetic paper Krisper K2311 (Toyobo Co., Ltd.) 38 μm thick × 930 mm wide, ink receiving layer NS600X (Takamatsu Yushi Co., Ltd.) was applied using a comma coater 50 μm synthetic paper is used.

2) Formation of magnetic layer 2) -1 Blending of coating liquid Ethylene / vinyl acetate copolymer Product name: Evaflex EW-40LX (VA 41%) Mitsui / DuPont Polychemical Co., Ltd. [Elastomer]・ ・ ・ ・ ・ ・ 70 parts by weight Ethylene / vinyl acetate copolymer Product name: EVAFLEX V-5572ET (VA 33%), Mitsui, manufactured by DuPont Polychemical Co., Ltd. [Elastomer] Part by weight anisotropic strontium ferrite powder, magnetic field orientation type (OP-71), manufactured by DOWA FTEC Co., Ltd. [Hard magnetic material] ... ... 800 parts by weight methyl ethyl ketone [organic solvent] ... 240 parts by weight toluene [organic solvent] ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ 73 Parts [loading 88.9 wt% of the magnetic material powder in the solid content (60.3% by volume)]

2) -2 Preparation of coating liquid According to the above formulation, an organic solvent and an elastomer were added to a stirrer (disper; shear type blade diameter 200 mm), stirred and dissolved, and then anisotropic strontium ferrite powder was added and mixed and stirred. The material is subjected to a dispersion treatment in a sand mill (beads: 1.25 mm, disk: flat type, peripheral speed 12 m / s).

2) -3 Magnetic layer coating Known after stirring and viscosity adjustment with a stirrer just before coating, applying to a coating thickness of 90 μm (dry) using a comma coater on one side of the support and spreading before the drying oven After performing in-plane orientation (FIG. 5) through a magnetic field repulsive magnetic field orientation device (see FIG. 4), the precursor is prepared by cooling through a drying furnace (50 to 100 ° C. × 10 minutes) and then cooling.
(2) Laminate another support on the other side

Using a known dry laminator composed of a gravure coater head, a drying furnace, and a nip roll (heating roll and rubber roll), another support is laminated on the other surface under the following conditions. (Figure 3)
An adhesive (Hydran HW-311 / DIC Graphics) was applied to the back surface of the support, coating thickness: 1 to 3 μm (dry), thermal activation temperature: 80 to 90 ° C., hardness of rubber roll of nip roll: 60, Linear pressure: about 120 N / cm.

(3) Magnetization In a type using two known permanent magnet type magnetizing rolls (Y) (FIG. 10), the direction of the magnetic pole is perpendicular to the in-plane orientation direction (production flow direction) of the magnet sheet, Random double-sided magnetization based on a 2.0 mm pitch between the poles of multipolar magnetization is performed to obtain a magnet film having a support on both sides. That is, the conventionally known permanent magnet type magnetizing roll makes the thickness of the incorporated permanent magnet uniform 2.0 mm, whereas the magnetizing roll implementing the present invention has a thickness of the incorporated permanent magnet of 1 unit. Is 10 mm, and there is one each between 1.6 mm, 1.8 mm, 2.0 mm, 2.2 mm, and 2.4 mm, and the order is random within each successive unit. Magnetization is performed using a magnetizing roll incorporated as described above.

The thickness of the magnetic layer of the precursor is 45 μm, and the same procedure as in Example 1 is performed except that the magnetic layers are bonded to each other using an adhesive.
(1) Bonding of magnetic layers with each other Using a known dry laminator comprising a gravure coater head, a drying furnace, and a nip roll (heating roll and rubber roll), lamination is performed under the following conditions. (See Figure 3)
Adhesive (Hydran HW-311 / manufactured by DIC Graphics) is applied to the magnetic layer surface of one precursor, coating thickness: 1 to 3 μm (dry), thermal activation temperature: 80 to 90 ° C., rubber roll of nip roll Hardness: 60, linear pressure: about 120 N / cm.

(2) Application example (creation of postcards)
Cut the postcard of length 480mm x width 930mm, and print the address face of the postcard on one side of the postcard of length 150mm x width 100mm on 27 sheets of width 9 rows x length 3 (postcard, postal code frame, stamp Printing a sticky frame) and printing a landscape image on the other side by ink jet printing, and cutting a postcard of 150 mm length × 100 mm width.

  Example 2 except that the base material is PET synthetic paper Krisper K2323 (Toyobo Co., Ltd.) with a thickness of 75 μm and an ink receiving layer NS600X (Takamatsu Yushi Co., Ltd.) is applied to make the total thickness 100 μm and the magnetic layer thickness 130 μm. To. (Hereafter, no postcard is created)

In the same manner as in Example 2, except that the poles are equally spaced by single-sided magnetization (FIG. 9), and in order to provide an inclination in the direction of the magnetic pole, the film is inclined and cut (FIG. 17).
The cutting is made with an inclination angle of 30 ° and an angle of 60 ° (the crossing angle when measuring the overlapping magnetic attraction force is 30 °).

Example 2 is the same as Example 2 except that the distance between the poles is equal (1 mm) and the inclination cutting for providing the inclination in the magnetic pole direction is changed.
Cutting is made with an inclination angle of 60 ° and 30 ° (the crossing angle when measuring the overlapping magnetic attraction force is 90 °).

  The magnet film which carried out the inclination cutting like Example 4 except having made the space | interval between random like Example 1. FIG.

Same as Example 5 except that the support is PP synthetic paper SPUY115VSIP 100 μm thick (Nisshinbo Co., Ltd.), the magnetic layer thickness is 130 μm (magnetic surface bonding), and random magnetization (2.5 mmP between standard poles) is used. To.
Random magnetization has a unit size of 12.50 mm, and there is one each between 2.0 mm, 2.25 mm, 2.5 mm, 2.75 mm, and 3.00 mm poles. Magnetization is performed using a magnetizing roll incorporated so as to be random within each continuous unit.

(Comparative Example 1)
In the same manner as in Example 1, a magnetic layer formed on one surface of the support, without the support provided to other one side, the magnet film machining gap subjected to double-sided magnetization equally spaced (2mmP).

(Comparative Example 2)
In the same manner as in Example 1, a magnetic film in which a magnetic layer is formed on one side of a support and random magnetization with a standard pole distance of 2.0 mm is performed without providing a support on the other side.

(Comparative Example 3)
In the same manner as in Example 1, a magnetic layer was formed on one side of a support, and a support was not provided on the other side, and a magnet film was used that was magnetized with an equal interval (2 mmP) between the poles. Inclined and cut magnetic film (inclination angles of 30 ° and 60 °, with a crossing angle of 30 ° when measuring the overlapping magnetic attractive force).

(Comparative Example 4)
In the same manner as in Example 1, a magnetic layer is formed on one side of a support, and a support is not provided on the other side, and a magnet film subjected to random magnetization with a standard pole distance of 2.0 mm is used. Cut magnetic film (inclination angles of 30 ° and 60 °, and an intersecting angle of 30 ° when measuring the overlapping magnetic attractive force).

(Comparative Example 5)
Except that the support is PET synthetic paper Krisper K2323 (Toyobo Co., Ltd.) with a thickness of 75 μm, and the ink receiving layer NS600X (Takamatsu Yushi Co., Ltd.) is applied to a total thickness of 100 μm, and no support is provided on the other side. Magnetic film as in Example 7.

Next, a performance test method and the like will be described.
1. Magnetic adsorption force measurement method (perpendicular magnetic adsorption force between magnet film and soft iron plate)
This measuring method is a standard method for measuring magnetic attraction force, and the performance of the magnetic attraction force of a single magnet film can be known.
A smooth 2 mm-thick soft iron plate having a square of about 60 mm on one side is attached to the upper surface of a smooth plastic plate using a double-sided tape. On the other hand, a square test sample with a side of 40 mm is stuck to a smooth plastic plate with a side of 50 mm provided with a hook at the center of the back using a double-sided tape. Then, the magnetic adsorption force (g / cm ²⁾ is calculated by measuring the force required to magnetically attract the two and pulling them apart in the vertical direction by hooking a spring balance on the back of the plastic plate. (See Figure 20)

2. Method for measuring lap tensile shear magnetic adsorption force A square test sample having a side of about 60 mm is attached to the upper surface of a smooth plastic plate using a double-sided tape. On the other hand, another test sample is attached to a square plastic plate having a hook at the center of the side and having a side of 50 mm using a double-sided tape. Then, the force required to magnetically attract the two and pull them apart in the horizontal direction is measured by hooking a spring balance to the hook on the side of the plastic plate to calculate the tensile shear magnetic attracting force (g / cm ²⁾ . (See Figure 21)

3. Anti-waving deformation adsorbability test method Two anti-magnetic wave test cards (100 x 150 mm) are stacked, and the anti-waving deformation after standing for 7 days in a hot air circulation thermostat at 38-42 ° C. A four-step evaluation is performed by observing the presence or absence of adsorption. (See Figure 15)
◎: No undulations are observed. ○: Most undulations are not observed. △: Some undulations are observed.

4. Corner edge resistance test method
At a room temperature of 21 to 25 ° C., two magnetic film cards, which are test samples (100 × 150 mm), are first stacked, and the angle at which the magnetic attractive force between the cards becomes maximum within a magnetic pole direction of 360 ° ( The front and back sides are magnetically attracted with the magnetic pole directions overlapping. In addition, in order to align the irregular cards in which a total of 10 cards were stacked in the same manner sequentially against the magnetic attractive force, the alignment was repeated three times by placing the four sides one by one against the flat surface of the table. Then, the four-level evaluation is performed by visually observing the deformation of the corner ends and the degree of scratches. (See Figure 19)
A: Deformation is not recognized. O: Deformation is hardly recognized. Δ: Deformation is slightly recognized. X: Deformation is recognized.

5. Workability test method After 50 magnetic film cards, which are test samples (100 × 150 mm), are scattered on the table, the work of aligning the four corners by 10 pieces is performed, and four-stage evaluation is performed.
◎: Excellent ○: Good △: Slightly inferior ×: Inferior

Next, test results will be described.
Each test was conducted for each example and comparative example, and the main configuration and test results were summarized in a table.
Table 1 summarizes the examples of the present invention, and Table 2 summarizes the comparative examples.

1. As can be seen from Example 1 and Comparative Example 1, since Example 1 has a support on both sides and the distance between the poles is random, the effect of reducing the overlap magnetic attractive force (shear tensile magnetic attractive force) is great, and the wave resistance The workability is also excellent because of the excellent hitting and adsorbing properties and deformation resistance at the corners. On the other hand, in Comparative Example 1, since the distance between the poles is equal, the overlapping magnetic attractive force is large, and the corner end resistance and workability are inferior.

2. As can be seen from Example 2 and Comparative Example 2, Example 2 has a large effect of reducing the superposition magnetic adsorption force (shear tensile magnetic adsorption force) because the support is on both sides and the distance between the poles is random. The workability is also excellent because of the excellent hitting and adsorbing properties and deformation resistance at the corners. On the other hand, in Comparative Example 2, since the support is only on one side, the wave-adsorbing adsorption property and the corner portion deformation property are inferior, and the workability is also inferior.
3 and Example 3 are also excellent as in Example 2.

4. As can be seen from Example 4 and Comparative Example 3, in Example 4, the support is on both sides and the magnetic poles are crossed, so that the effect of reducing the overlap magnetic attractive force (shear tensile magnetic attractive force) is great, and the wave resistance The workability is also excellent because of the excellent hitting and adsorbing properties and deformation resistance at the corners. On the other hand, in Comparative Example 3, since the support is only on one side, the corner portion deformation resistance is inferior and the workability is also inferior because the work requires attention.
5 and Example 5 are excellent as in Example 4.

6. As can be seen from Example 6 and Comparative Example 4, in Example 6, the support is on both sides and the magnetic poles are randomly separated between the poles, and the magnetic poles are crossed, thereby reducing the overlap magnetic attractive force (shear tensile magnetic attractive force). The effect is great, and the workability is also excellent because of the excellent anti-corrugation and corner deformation resistance. On the other hand, Comparative Example 4 is inferior in workability because the support is single-sided and the corner end resistance is inferior. The same applies to Example 7 and Comparative Example 5.

7. As can be seen from these results, it can be seen that the effect of having the support of the present invention on both sides is great. In addition, by applying an incline to the flow direction of the in-plane oriented magnet film of the present invention and cutting it at regular scales (Examples 4 to 7, Comparative Examples 3 to 5), the superposition magnetic adsorption force (shear tensile magnetism) It can also be seen that an effect of reducing the adsorption force is obtained.

8. In addition, the postcard created in the application example of Example 2 was magnetically attached to a steel locker to examine the practicality of attachment / detachment. As a result, it was easy to put on and take off, and the pasting of the landscape was positive.

The product of the present invention is a magnet film having a support that can be printed on both sides and magnetized on one side or both sides. Excellent part deformability.
In addition, it is expected that the double-sided use that can be used upside down will be applied to cards, display of indoor wall surfaces, and display of bulletin boards. In particular, those with a weight of 480 g / m ² or less are suitable because they can be applied to postcards and can be obtained in accordance with the size and weight of the flat rate of postcards (second-class postal items).

A Magnet film of the present invention (omitted description of weak magnetic poles on the non-magnetized surface side)
A1 Magnet film of the present invention with different magnet layer formation A2 Magnet film of the present invention A3 magnetized randomly between magnetized poles A3 Standard magnet film of the present invention cut obliquely with respect to the magnetic pole direction of magnetization A4 Magnet film by conventional magnetizing system (equal spacing between poles)
A4-1 Conventional magnetic film with a support on one side (between the magnetic poles is random)
B Precursor B1 of the magnetic film A of the present invention B1 Precursor MC of the magnetic film A1 of the present invention MC A coater provided with a magnetic field orientation device
MM In-plane orientation type magnetic field orientation apparatus CA1, CA2, CA3 Magnet film card DL of the present invention Dry laminator HL Thermal laminator C C axis direction of magnetic powder crystal F Flow direction of product M Direction of magnetic field orientation magnetic flux MB Vertical repulsive magnetic field (plane Inward) Magnetic flux MB1 from type magnetized yoke Magnetic flux from single-sided magnetized yoke N N pole of magnet n, N pole generated on the back (non-magnetized surface), N1, N pole of other magnet S S pole of magnet S, S pole generated on the back surface (non-magnetized surface), S1, S poles d1, d2, d3, d4, d5, d6, d7, d8, d9 of other magnets Y between poles Permanent magnet type magnetized roll MA1 Soft iron plate Measuring device MA2 perpendicular to magnetic film between magnet film and tensile shearing magnetic force measuring device 1 between magnet films 1 Support 1-1 Film similar to support 2 Magnetic layer with in-plane orientation of magnetic powder 3 Coater head ( Nmakota)
4 Drying furnace 5 Nip roll 6 Cooling roll 7 Unwinder 8 B, B-1 (winder)
9 Permanent magnet 10 Magnetic powder (anisotropic ferrite crystal)
11 Coater head (gravure roll coater)
12 Magnetic film (Magnet film not magnetized)
13 Heating roll 14 Guide roll (non-magnetic)
15 Nd-Fe-B rare earth permanent magnet 16 Back yoke 17 made of soft magnetic material (such as iron) Shaft 18 Flat base (table)
19 smooth plastic plate 20 double-sided adhesive tape 21 soft iron plate 22 test sample 23 smooth plastic plate provided with a hook in the center 24 spring balance 25 test sample 26 other test sample 27 smooth plastic provided with a hook in the center of the side Board

Claims (7)

With polyethylene terephthalate-based synthetic paper, on one side of the support having a thickness of 40 to 220 μm, the main component is an anisotropic ferrite-based hard magnetic material powder as a magnetic paint and an organic polymer elastomer-based varnish as a binder, Filling amount of anisotropic ferrite hard magnetic material powder 50 to 65% by volume with respect to the total amount of anisotropic ferrite hard magnetic material powder, organic polymer elastomer and processing aid, which is a solid part after drying Is applied so that the thickness after drying becomes 40 to 250 μm, and the easy axis of magnetization of the anisotropic ferrite type hard magnetic material powder is aligned in the in-plane magnetic field in the direction parallel to the support surface to dry the magnetic coating film. To the magnetic film formed ,
Magnetic layer between bonded to it as a magnetic film having a support on both sides to grant seaworthiness droplet deformation adsorptive and耐角end deformation of the laminate or magnetic film similar to the film and support,
The magnetic pole direction on one side or both sides with respect to the magnetic orientation direction, it was subjected to magnetization randomly distance between the poles of the multipolar magnetized in a direction perpendicular, the magnetic attraction force of the magnet between films during handling Reduced magnet film , evaluated by the following undulation deformation adsorption test and corner end deformation test: Excellent undulation deformation adsorption and corner end deformation conforming to ◎ Characteristic magnet film.

1. Anti-waving deformation adsorption test method
Two magnetic films, which are test samples (100 × 150 mm), are overlapped, and after standing for 7 days in a hot-air circulating thermostatic device at 38 to 42 ° C., the presence or absence of undulation deformation adsorption is observed and evaluated in four stages. . )
◎: No undulations are observed. ○: Most undulations are not observed. △: Some undulations are observed.
2. Corner edge resistance test method
At a room temperature of 21 to 25 ° C., two magnetic film cards, which are test samples (100 × 150 mm), are first stacked, and the angle at which the magnetic attractive force between the cards becomes maximum within a magnetic pole direction of 360 ° ( The front and back sides are magnetically attracted with the magnetic pole directions overlapping. In addition, in order to align the irregular cards in which a total of 10 cards were stacked in the same manner sequentially against the magnetic attractive force, the alignment was repeated three times by placing the four sides one by one against the flat surface of the table. Then, the four-level evaluation is performed by visually observing the deformation of the corner ends and the degree of scratches.
◎: Deformation is not recognized ○: Deformation is hardly recognized Δ: Deformation is slightly recognized
X: Deformation is recognized.
With polyethylene terephthalate-based synthetic paper, on one side of the support having a thickness of 40 to 220 μm, the main component is an anisotropic ferrite-based hard magnetic material powder as a magnetic paint and an organic polymer elastomer-based varnish as a binder, The amount of the anisotropic ferrite hard magnetic material powder filled to 50 to 65% by volume with respect to the total amount of the anisotropic ferrite hard magnetic material powder, the organic polymer elastomer and the processing aid, which is a solid part after drying, Using this coating, the thickness after drying is 40-250 μm, and the magnetic axis of the magnetic axis of the anisotropic ferrite-based hard magnetic material is aligned in the in-plane magnetic field parallel to the support surface and dried to form a magnetic coating film. the magnetic film which is formed by,
Magnetic layer between bonded to it as a magnetic film having a support on both sides to grant seaworthiness droplet deformation adsorptive and耐角end deformation of the laminate or magnetic film similar to the film and support,
The magnetic pole direction is magnetized on one side or both sides of the magnetic field in the direction perpendicular to the direction of the magnetic field, and the distance between each pole of the multipolar magnetization is magnetized at equal intervals. The direction of the magnetic field is 10 to 80 degrees or minus 10 to 80 degrees with respect to the magnetic field orientation direction and is cut by providing an arbitrary inclination, thereby reducing the magnetic attractive force between the magnet films during handling , claim 1 for evaluation in耐耐angle end modified test method described: ◎ Blank magnet film characterized good that compatible 耐角end deformable to mark.
Using the magnetic film according to claim 1, the rectangular cut can be arbitrarily set within a range of 10 to 80 degrees or minus 10 to 80 degrees with respect to the magnetic field orientation direction in the direction of the vertical or horizontal side of the square. 3. The fixed-length magnet film according to claim 2, wherein the magnetic attractive force between the magnet films is further reduced by providing an inclination and cutting.
  A magnetic film in which the hard magnetic material powder is a ferrite hard magnetic material powder, the amount of the ferrite hard magnetic material powder in the magnetic coating film is 50 to 65 v%, and the thickness of the magnetic coating film is 40 to 250 μm The magnet film according to any one of claims 1 to 3, wherein a multipolar magnetization having a gap of 1 to 2.5 mm is applied to one side or both sides. The support of the magnet film having a support on both sides is a polyethylene terephthalate synthetic paper having a thickness of 40 to 60 μm, a magnetic coating film thickness of 80 to 100 μm, a magnetic adsorption force of 0.5 to 2.0 g / cm ² , and its own weight 480 g / The magnetic film according to claim 1, wherein the magnetic film is m ² or less.   6. The magnet film according to claim 1, wherein the non-coated surface of the support is a printable or erasable surface.   A magnet film card using the magnet film according to any one of claims 1 to 6.

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