JP2003158011A - Magnetic attraction sheet, magnetizing method and manufacturing method thereof - Google Patents

Abstract

[PROBLEMS] To provide a magnetic attraction sheet which can be manufactured at low cost by continuous multipolar magnetization, and a magnetizing method and a manufacturing method thereof. A step of orienting an easy axis of magnetization in a longitudinal direction of a long sheet, and a step of causing a plurality of plate-like permanent magnets magnetized in a direction parallel to a plate surface to face different polarities. A step of arranging the laminated composite permanent magnets 9a and 9b so as to face one surface of the sheet so that the laminating direction of the plate-shaped permanent magnet coincides with the axis of easy magnetization; The composite permanent magnet is moved at a constant speed in a direction A perpendicular to the easy axis of magnetization while moving the sheet at a constant speed in the direction of the easy axis of magnetization at a predetermined value or less. Are alternately inverted,
A method of magnetizing a magnetic attraction sheet and a method of producing the magnetic attraction sheet, comprising a step of performing multipolar magnetization on the magnetic attraction sheet, and a magnetic attraction sheet obtained by the method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic attraction sheet, a method of magnetizing the same, and a method of manufacturing the same, and more particularly to a method of magnetizing a long magnetic attraction sheet continuously.

[0002]

2. Description of the Related Art Magnetic attraction sheets utilizing the magnetic attraction of magnets are widely used as various display tools. For example,
In Japanese Unexamined Patent Publication No. 10-24534, magnetic powder is mixed into a synthetic resin material and formed into a sheet, and N is formed on one surface.
Thickness of 0.05 to 0.15 with multiple poles magnetized by alternating poles and S poles
The other side of the magnet sheet of
There is disclosed a printable display magnet sheet to which a 5 mm print sheet is attached. This publication does not particularly show a method of magnetizing the magnet sheet.

Further, in Japanese Patent Laid-Open No. 2001-76920, a coating film of magnetic paint in which hard magnetic powder is dispersed is formed on a support, and the easy axis of magnetization of the hard magnetic powder is in one direction parallel to the surface of the support. Oriented flexible magnet sheets are disclosed. In this magnet sheet, the coating film is magnetized in multiple directions in the same direction as the orientation direction of the easy axis of magnetization.

According to the conventional magnetizing method, a magnetized pattern groove is formed on the surface of a flat iron material having the same size as the magnetized magnetic attraction sheet (magnet sheet) to be magnetized, and the groove is filled with a coil. A magnetizing yoke is used. A magnetic attraction sheet is closely attached to the magnetizing yoke, and a large current is passed through the coil to generate a magnetic field for magnetization.

As a magnetizing method that does not require a large current to flow, there is a method described in Japanese Patent Application Laid-Open No. 2001-68337. According to this method, a plurality of flat plate-shaped permanent magnets that are magnetized in the direction perpendicular to the flat plate surface are arranged as a composite permanent magnet in which the same polar surfaces are opposed to each other and arranged in a row. The sheet is multi-polarized by moving it relative to the surface of the hard magnetic sheet.

Further, Japanese Unexamined Patent Publication No. 2001-230118 discloses a magnetizing device and a printer using a composite permanent magnet described in Japanese Unexamined Patent Publication No. 2001-68337 as a magnetizing body for magnetizing. 8 and 9 of this publication,
An example is shown in which the axis of the magnetizing cylindrical magnet body is inclined with respect to the transport direction of the magnet sheet and the magnetizing pitch is changed.

[0007]

However, in the case of the magnetizing method in which a large current is passed through the coil, a large power supply device is required and power consumption is large, resulting in high manufacturing cost. Moreover, it is necessary to manufacture an expensive magnetizing yoke in the size of the sheet to be magnetized. When magnetizing using a magnetizing yoke smaller than the size of the sheet, it is necessary to move the magnetizing yoke a plurality of times on the sheet for magnetizing.

Further, since the charging time is required after magnetizing by discharge, the magnetizing process cannot be continuously performed. As described above, the magnetizing method using the magnetizing yoke is particularly disadvantageous for magnetizing a large-sized magnetic attraction sheet exceeding A2 size or a long magnetic attraction sheet wound in a roll shape. .

When using the composite permanent magnet (magnetizing body for magnetization) described in JP 2001-68337 A or JP 2001-230118 A, it is not necessary to pass a large current for magnetization, A repulsive force acts between the flat plate-shaped permanent magnets forming the composite permanent magnet. Therefore, it is difficult to manufacture a composite permanent magnet, and in order to suppress the repulsive force between the stacked magnets,
It is necessary to constantly apply force from both ends.

In the composite permanent magnet described in JP 2001-68337 A or the magnetizing magnet body (cylindrical magnet body) described in JP 2001-230118 A, a flat permanent magnet (or a thin plate magnet) is used. By making it thinner, the magnetization pitch becomes narrower. Since the flat plate permanent magnet is magnetized in the direction perpendicular to the flat plate surface, the distance between the magnetic poles of the flat plate permanent magnet is equal to the thickness of the flat plate permanent magnet. Therefore, if the plate-shaped permanent magnet is made thin for the purpose of narrowing the magnetizing pitch, the distance between the magnetic poles becomes short and the leakage magnetic flux density becomes small.

[00] of Japanese Patent Application Laid-Open No. 2001-68337
15] and [0 of JP 2001-230118 A].
[031] describes that the cylindrical magnet body may be arranged to be inclined with respect to the conveying direction of the magnet sheet. However, in these publications, the easy axis of magnetization is not oriented parallel to the sheet surface. In addition, JP 2001
In the case of the arrangement shown in FIG. 8 of the -230118 publication, the magnet sheet is contacted with the cylindrical magnet body, and the cylindrical magnet body 2 is rotated without changing the position of the axis of the cylindrical magnet body 2 so that the magnet sheet is removed. It cannot be transported in the direction of the arrow.

If the magnet sheet and the cylindrical magnet body are separated from each other, it is possible to convey the magnet sheet in the direction of the arrow, which is disclosed in Japanese Unexamined Patent Publication No. 2001-68337 [0011].
As described in, the magnetizing effect is higher when the magnet sheet and the cylindrical magnet body are in contact with each other.

As described above, the conventional magnetizing method is not suitable for continuously performing multipolar magnetization on a long magnetic attraction sheet. Further, it is not suitable for performing multipolar magnetization on a long magnetic attraction sheet in which the easy axis of magnetization is oriented in the longitudinal direction.
Further, there is not shown a configuration capable of continuously applying magnetic paint, orienting the easy axis of magnetization, and magnetizing the magnetic layer in multiple poles. Therefore, it is difficult to efficiently continuously manufacture the magnetic adsorption sheet and suppress the manufacturing cost.

When multi-pole magnetizing is performed on a long magnetic adsorption sheet having an easy axis of magnetization oriented in the longitudinal direction, magnets in which N poles and S poles are alternately arranged along the longitudinal direction of the magnetic adsorption sheet are used. It may be brought close to or in contact with the magnetic attraction sheet.
However, when magnetizing a large-sized roll-shaped magnetic attraction sheet that exceeds A2 size, for example, it is difficult to obtain a magnet having a width approximately equal to the sheet width.

Even if a magnet having a width about the same as the sheet width is obtained, when such a magnet is used for magnetization, the sheet and the magnet are moved relatively after performing the magnetization once. , It cannot be magnetized until it is magnetized to different places on the sheet. Therefore, the magnetization is intermittent and continuous processing cannot be performed.

In the case of a roll-shaped magnetically attractable sheet, conveyance of the sheet, that is, rotation of the roll is stopped during the magnetization, and the throughput is lowered. When the orientation of the easy axis of magnetization and the magnetization are continuously performed in the process of transporting the roll-shaped magnetic adsorption sheet, if the rotation of the roll is stopped at a constant interval for magnetization, the orientation process is performed. It causes trouble.

The present invention has been made in view of the above problems, and therefore an object of the present invention is to provide a magnetic attraction sheet which can be manufactured at low cost by continuous multipolar magnetization. Another object of the present invention is to provide a method for magnetizing a magnetic attraction sheet, which can continuously and inexpensively perform multipole magnetization on a long magnetic attraction sheet. A further object of the present invention is to provide a method for producing a magnetic adsorption sheet that can continuously perform formation of a magnetic layer, orientation of an easy axis of magnetization, and multipolar magnetization.

[0018]

In order to achieve the above object, the magnetic adsorption sheet of the present invention is a magnetic layer in which a magnetic coating material in which a ferromagnetic powder is dispersed in a binder is coated on a non-magnetic support. Wherein the magnetic layer has an easy axis of magnetization in the in-plane direction, and the magnetization is alternately inverted in one direction of the in-plane direction, which is different from the easy axis of magnetization. It is characterized by being magnetized in multiple poles.

Preferably, the magnetic attraction sheet has an elongated shape, and the easy axis of magnetization is oriented in the longitudinal direction of the magnetic attraction sheet. This makes it possible to continuously magnetize the long magnetic attraction sheet while conveying the sheet.

In order to achieve the above object, the method of magnetizing a magnetic attraction sheet according to the present invention comprises a step of orienting an easy axis of magnetization in the longitudinal direction of a long magnetic attraction sheet and a flat plate surface. Is a composite permanent magnet in which a plurality of flat plate-shaped permanent magnets magnetized in a direction parallel to each other are laminated with opposite pole faces facing each other, and the composite permanent magnet has end faces in which different poles are alternately arranged. , A step of arranging the end surface so as to face one surface of the magnetic attraction sheet, and the stacking direction of the flat plate-shaped permanent magnet and the easy axis of magnetization coincide, and the end surface and the magnetic attraction sheet The composite permanent magnet is orthogonal to the easy axis of magnetization while moving the magnetically attractable sheet at a constant speed in the direction of the easy axis of magnetization, with an interval below a predetermined value at which the magnetically attractable sheet is magnetized. At a constant speed in the direction Is dynamic, the so magnetized in an oblique direction with respect to the axis of easy magnetization is reversed alternately, characterized in that a step of performing a multi-pole magnetized in the magnetic sticking sheet.

In order to achieve the above-mentioned object, a method of magnetizing a magnetic attraction sheet according to the present invention comprises a step of orienting an easy axis of magnetization in the longitudinal direction of a long magnetic attraction sheet, and a flat plate with respect to a flat surface. Is a composite permanent magnet in which a plurality of flat plate-shaped permanent magnets magnetized in parallel directions are laminated with different pole faces facing each other, and the complex permanent magnet having end faces in which different poles are alternately arranged, The end face is opposed to one face of the magnetic attraction sheet, and the step of arranging so that the stacking direction of the flat plate-shaped permanent magnet and the easy axis of magnetization coincide with each other, and the interval between the end face and the magnetic attraction sheet. The magnetic attraction sheet is magnetized at a predetermined value or less, and the composite permanent magnet is moved at a constant speed in a direction orthogonal to the easy axis of magnetization.
A method of magnetizing a magnetic attraction sheet, the method comprising: performing multi-pole magnetization so that the magnetization is alternately inverted in the direction of the easy axis of magnetization, the magnetic attraction sheet having a constant speed in the direction of the easy axis of magnetization. The multi-pole magnetization is performed by locally accumulating the magnetic attraction sheet while moving the magnetic attraction sheet and temporarily stopping the portion of the magnetic attraction sheet facing the composite permanent magnet.

As a result, it becomes possible to continuously magnetize the magnetically attracted sheet to be magnetized while moving the magnetized sheet to be magnetized at a constant speed, and it is possible to increase the magnetizing throughput.

Further, in order to achieve the above object, in the method for producing a magnetic adsorption sheet of the present invention, a ferromagnetic powder is bound on a long non-magnetic support which moves in the longitudinal direction at a constant speed. A step of applying a magnetic paint dispersed therein, a step of orienting the easy axis of magnetization of the ferromagnetic powder in the longitudinal direction of the non-magnetic support, a step of drying the magnetic paint to form a magnetic layer, Magnetizing the magnetic layer so that the magnetization is alternately inverted in the in-plane direction of the magnetic layer and in a direction oblique to the easy axis of magnetization. The step of performing is a composite permanent magnet in which a plurality of flat plate-shaped permanent magnets that are flat and magnetized in the direction parallel to the flat plate surface are laminated with different pole surfaces facing each other, and different poles are alternately arranged. The composite permanent magnet having an arrayed end surface, the end surface is at least the Magnetic layer is magnetized with a step of arranging it so as to face the magnetic layer and the laminating direction of the flat plate-shaped permanent magnet and the easy axis of magnetization coincide with each other, and a gap between the end face and the magnetic layer. As a predetermined value or less, while moving the non-magnetic support in the direction of the easy axis of magnetization at a constant speed, moving the composite permanent magnet at a constant speed in the direction orthogonal to the easy axis of magnetization. It is characterized by having.

Alternatively, in the method for producing a magnetic adsorption sheet of the present invention, a magnetic coating material in which ferromagnetic powder is dispersed in a binder is provided on a long non-magnetic support which moves in the longitudinal direction at a constant speed. A step of applying, a step of orienting the easy axis of magnetization of the ferromagnetic powder in the longitudinal direction of the non-magnetic support, a step of drying the magnetic paint to form a magnetic layer, and an in-plane direction of the magnetic layer. , And a step of performing multi-pole magnetization on the magnetic layer so that the magnetization is alternately inverted along the easy axis of magnetization, and the step of performing the multi-pole magnetization is a flat plate-like surface. A plurality of flat plate-shaped permanent magnets magnetized in parallel to each other is a composite permanent magnet laminated with opposite pole faces facing each other, wherein the composite permanent magnet has end faces in which different poles are alternately arranged, The end face faces at least the magnetic layer, and the plate-shaped permanent A step of arranging so that the stacking direction of stones and the easy axis of magnetization coincide with each other, and the moving non-magnetic support is locally accumulated, and the non-magnetic support at a portion facing the composite permanent magnet is temporarily stored. In the state of being stopped,
The composite permanent magnet is moved at a constant speed in a direction orthogonal to the easy axis of magnetization with a gap between the end face and the magnetic layer being equal to or less than a predetermined value for magnetizing the magnetic layer, and the easy axis of magnetization is moved. And a step of performing multi-pole magnetization so that the magnetization is alternately inverted in the direction.

As a result, it becomes possible to continuously perform the formation of the magnetic layer including the step of applying the magnetic coating material, the orientation of the easy axis of magnetization, and the multi-pole magnetization, thereby efficiently producing the magnetic adsorption sheet. It becomes possible to reduce the manufacturing cost.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the magnetic attraction sheet and the method of magnetizing and manufacturing the same according to the present invention will be described below.
A description will be given with reference to the drawings. (Embodiment 1) FIG. 1 is a sectional view of a magnetic adsorption sheet of the present embodiment. As shown in FIG. 1, the magnetic adsorption sheet 1
Has a magnetic layer 3 on one surface of the non-magnetic support 2 and a print receiving layer 4 on the other surface. The easy axis of magnetization of the magnetic layer 3 is oriented in a direction parallel to the sheet surface (in-plane direction).
Further, the magnetic layer 3 is multipolarly magnetized so that N poles and S poles are alternately arranged in the in-plane direction, but the direction of multipole magnetization and the orientation direction of the easy axis of magnetization do not match and are constant. Make an angle.

As the non-magnetic support 2 and the print receiving layer 4, for example, synthetic paper having an ink jet receiving layer formed on one surface can be used. A magnetic paint containing magnetic powder is applied to the surface of such a synthetic paper opposite to the print receiving layer 4 (ink jet receiving layer). Magnetic paint
For example, it is prepared by mixing and dispersing Sr ferrite particles in a MEK solvent and a molten urethane resin.

After the magnetic coating material is applied, the easy axis of magnetization of the magnetic powder in the coating film is magnetically oriented. Non-magnetic support 2
However, by passing through a magnetic field of magnetic flux parallel to the traveling direction of the non-magnetic support 2, the easy axis of magnetization of the magnetic powder in the coating film is oriented in the traveling direction of the non-magnetic support 2.

FIG. 2 is a schematic view in which an external magnetic field is applied from the permanent magnets 6a and 6b to the coating film 5 on the non-magnetic support 2 to orient the easy axis of magnetization of the magnetic powder in the in-plane direction of the coating film 5. Is. As shown in FIG. 2, the coating film 5 passes between the pair of permanent magnets 6a and 6b, whereby the magnetic powder is oriented.
The pair of permanent magnets 6a, 6b are arranged so as to face each other with the non-magnetic support 2 and the coating film 5 in between. Permanent magnet 6
Due to the magnetic repulsion between a and 6b, a magnetic flux represented by a magnetic force line 7 is generated in the traveling direction of the non-magnetic support 2.

Alternatively, the permanent magnets 6 are provided on both sides of the coating film 5.
It is also possible to arrange a pair of solenoid coils instead of a and 6b to generate a magnetic field and orient the easy axis of magnetization of the magnetic powder in the traveling direction of the non-magnetic support 2. As described above, a flexible sheet is produced, and this sheet is subjected to multipolar magnetization.

FIG. 3 is a schematic diagram showing the principle of the magnetizing method of this embodiment. As shown in FIG. 3, composite permanent magnets 9a and 9b are arranged on both surface sides of the sheet 8 to be magnetized so that the same poles face each other. The composite permanent magnets 9a and 9b have a structure in which flat plate-shaped permanent magnets 10 are stacked with opposite pole faces facing each other.

The composite permanent magnets 9a and 9b are fixed to holders 11a and 11b, respectively. Alternatively, a back yoke made of a soft magnetic material such as an iron plate may be provided on the side of the composite permanent magnets 9a, 9b that does not face the sheet 8. Thereby, the surface magnetic flux density of the composite permanent magnets 9a and 9b can be further increased.

As shown in FIG. 2, when the easy magnetization axis is oriented in the longitudinal direction of the long magnetic adsorption sheet, as shown in FIG. 3, the N pole and the S pole are formed along the direction of the easy magnetization axis. The composite permanent magnets 9a and 9b are arranged so as to be arranged alternately. In particular,
In the case of large-sized magnetic sticking sheet exceeding A2 edition, composite permanent magnet 9 having a width comparable to the sheet width W _S
It is relatively difficult to obtain a, 9b (or the plate-shaped permanent magnet 10).

The width of the composite permanent magnets 9a and 9b (or the flat plate-shaped permanent magnet 10) is set to W _M , and the sheet 8 is subjected to multi-pole magnetization by using the composite permanent magnets 9a and 9b satisfying W _S > W _M. In this case, the magnetizing force can be maximized by moving the composite permanent magnets 9a and 9b relative to the sheet 8 in the direction A. In this way, the composite permanent magnet 9
FIG. 4 shows a top view of FIG. 3 when moving a and 9b.

However, when the sheet 8 is long,
When the sheet 8 and the composite permanent magnets 9a and 9b are moved relative to each other in the direction A, the sheet 8 is magnetized for the length of the magnetizing width W _L , and then the sheet 8 is moved in a direction parallel to the easy axis of magnetization. (Arrow B
It is necessary to convey the magnetized width W _{L in} the direction (1), and the magnetization cannot be performed while the sheet 8 is conveyed.

Therefore, according to the magnetizing method of this embodiment,
The composite permanent magnets 9a and 9b are moved relative to the sheet 8 in the direction of arrow A while the sheet 8 is conveyed in the direction of B at a constant speed. FIG. 5 is a top view showing an example of a method for continuously magnetizing the sheet 8 in FIG. 3 without stopping the conveyance.

Let V _S be the speed at which the long sheet 8 to be magnetized is conveyed in the longitudinal direction (direction of arrow B) which is the orientation direction of the easy axis of magnetization. Further, the composite permanent magnet 9a, 9b is the speed of moving in the direction or the opposite direction of the arrow A and V _M. In this case, the magnetized footprint drawn on the sheet 8 is inclined at an angle θ which is the arctangent of the value obtained by dividing the sheet moving speed V _S by the magnet moving speed V _M. The case where the angle θ is 0 ° corresponds to the magnetizing method shown in FIG.
The larger the angle θ, the lower the coercive force, but the moving speed V _{S of the} sheet can be increased.

Move the composite permanent magnets 9a and 9b from the position I to I
When the sheet 8 is moved to the position I, the sheet 8 is conveyed in the direction B by a predetermined magnetizing pitch. FIG. 5 shows an example in which the sheet 8 moves one pitch. By the time the seat 8 moves from the position II to the position III, the seat 8 is further moved by one pitch, B
Is conveyed in the direction of.

The composite permanent magnets 9a, 9b are moved from the position I to I
After moving to the position II, the distance between the composite permanent magnets 9a, 9b and the sheet 8 is increased to increase the distance between the composite permanent magnets 9a, 9b.
Return b to position I. At this time, if the moving distance of the sheet 8 and the magnetizing width W _{L of the} composite permanent magnets 9a and 9b are the same, and the moving speed V _{S of the} sheet and the moving speed V _{M of the} magnet are constant, the composite permanent magnet 9a. , 9b are arranged in a non-magnetized portion adjacent to the already magnetized portion.

Similar to the above, by repeating the movement of the composite permanent magnets 9a and 9b, the sheet 8 can be magnetized while the sheet 8 is being moved at a constant speed. The above-described operation is performed by the mechanism for conveying the sheet 8 and the composite permanent magnet 9
a mechanism for adjusting the distance between a and 9b, and a composite permanent magnet 9
This can be achieved by adding a mechanism for reciprocating a and 9b in the direction orthogonal to the moving direction of the sheet (the easy axis of magnetization). Therefore, the device configuration is relatively simple, and can be inexpensively incorporated into a continuous manufacturing device for magnetically attracting sheets. A configuration example of such a magnetizing device will be described later.

FIG. 6 is a top view showing another example of a method of continuously magnetizing the sheet 8 of FIG. 3 without stopping the conveyance. In the case of the magnetizing method shown in FIG. 6, the composite permanent magnet 9
After magnetizing the sheet 8 while moving a and 9b from the position I to the position III, the composite permanent magnets 9a and 9b are magnetized.
There is no need to increase the distance between the sheet and the sheet 8.

The composite permanent magnets 9a and 9b are moved from the position III to the position I without changing the distance between the composite permanent magnets 9a and 9b and the sheet 8. While the sheet 8 moves by the magnetized width W _L of the composite permanent magnets 9a, 9b, the composite permanent magnets 9a, 9b are reciprocated so that the composite permanent magnets 9a, 9b cross the sheet 8.

As in the case of FIG. 5, when the moving speed of the sheet is V _S and the moving speed of the magnet is V _M , the magnetization footprint is the angle at which the arc tangent of V _S divided by V _M is taken. Tilt to θ. As a result, a magnetized footprint is obtained in which isosceles triangles whose apex angle is twice the angle θ in FIG. 5 are continuously arranged. The overlapping portion of the magnetized footprints becomes the footprint that was overlaid later, and the previously magnetized footprints are erased.

FIG. 7 shows the composite permanent magnet 9a shown in FIGS.
9B is a view of the sheet 9b and the sheet 8 as viewed from the side. As shown in FIG. 7, the long sheet 8 to be magnetized is the supply reel 1
It is wound into a roll form. By winding the sheet 8 on the take-up reel 13 from one end in the longitudinal direction of the sheet 8, the sheet 8 is sent out from the supply reel 12 and conveyed in the direction of arrow B.

Here, the easy axis of magnetization is assumed to be oriented in the longitudinal direction of the sheet 8 by the method shown in FIG. Alternatively, the supply reel 12 and the composite permanent magnet 9a,
It is also possible to provide magnetic field generating means such as the permanent magnets 6a and 6b shown in FIG.

Further, by providing a magnetic paint coating device between the supply reel 12 and the magnetic field generating means, it is possible to continuously perform coating film formation, orientation of the easy axis of magnetization and multipolar magnetization. Is. Although not shown, a guide roller that rotates while being in contact with the sheet 8 to adjust the tension of the sheet 8 or improve the traveling property of the sheet 8 may be provided between the supply reel 12 and the take-up reel 13. Good.

Further, the composite permanent magnets 9 are provided on both sides of the sheet 8.
It is possible to perform multi-pole magnetization on the sheet 8 only by disposing one composite permanent magnet on one side of the sheet 8 without disposing a and 9b. When the magnetizing is performed from the one surface side of the sheet 8, the magnetizing device has a simple structure, and the cost of the magnetizing device can be reduced.

When the composite permanent magnets are the same, if the magnetizing is performed from only one side of the sheet 8, the magnetizing force will be lower than that when magnetizing from both sides. However, it has been confirmed by experiments that by using a composite permanent magnet having a high residual magnetic flux density, even if magnetized from one side, a magnetizing force comparable to that from both sides can be obtained. A configuration example of such a magnetizing device will also be described later.

FIG. 8 shows an example of a magnetizing device capable of performing the magnetizing process shown in FIG. Above and below the magnetized sheet 8,
A magnet array 9c of composite permanent magnets is arranged. The composite permanent magnets 9a and 9b on the upper and lower sides of the seat 8 are attached to the ball screw 14
a and 14b are synchronized with the timing belts 15a and 15b, and reciprocates in the direction indicated by arrow A.

The moving speed (conveying speed) of the sheet 8 in the direction of the arrow B is measured by a tachometer (FG; freque) of the guide roller 16.
It is read by the ncy generator or the optical encoder) 17. The composite permanent magnets 9a and 9b are moved by the motor 18 with FG. By synchronizing the moving speed of the seat 8 with the rotating speed of the motor 18 with FG, it is possible to continuously magnetize the footprint shown in FIG.

FIG. 9 is an example in which a part of the magnetizing device of FIG. 8 is modified, and the distance between the composite permanent magnets 9a and 9b and the sheet 8 is variable. According to this magnetizing device, as shown in FIG.
The magnetization treatment shown in can be performed. The magnetizing device of FIG. 9 is not provided with the timing belts 15a and 15b shown in FIG. 8, but the moving speed of the sheet 8 is read by the FG 17.
If the FG motors 18a and 18b are independently controlled based on this, the composite permanent magnets 9a and 9b can be reciprocated synchronously in the direction of arrow C. Other configurations are shown in FIG.
Common with the magnetizing device.

The sheet 8 moves in the direction of arrow B at a constant speed. The composite permanent magnets 9a and 9b move in synchronization with one direction in the direction of the arrow A in a state where the space between the composite permanent magnets 9a and 9b is narrowed. After the composite permanent magnets 9a and 9b cross the sheet 8, the distance between the composite permanent magnets 9a and 9b and the sheet 8 is widened, and the composite permanent magnet 9 is moved in the other direction in the direction of arrow A.
a and 9b move in synchronization.

FIG. 10 shows an example of a magnetizing device for magnetizing the sheet from one side. While moving the sheet 8 in the direction of arrow B at a constant speed, the composite permanent magnet 9 is moved to the direction of arrow A.
Reciprocate in the direction of. As a result, the magnetization shown in FIG. 6 is performed. Further, in the magnetizing device shown in FIG. 10, it is possible to perform the magnetizing shown in FIG. 5 by providing a mechanism for varying the distance between the composite permanent magnet 9 and the sheet 8. Note that the FG-equipped motor 18 may be directly connected to the bearing 24 similarly to the magnetizing device of FIG. 9, without providing the timing belt 15 shown in FIG.

(Embodiment 2) In Embodiment 1 described above, as shown in FIGS. 5 and 6, the orientation direction of the easy axis of magnetization and the direction of multipole magnetization do not match. According to this, as shown in FIG. 4, multipolar magnetization is performed along the orientation direction of the easy axis of magnetization. Therefore, the magnetizing force with respect to the magnetic attraction sheet can be increased as compared with the case where the magnetization is performed obliquely.

According to the magnetizing method of the present embodiment, the magnetizing device shown in FIG. 7 is provided with a buffer mechanism for varying the length of the sheet 8 between the supply reel 12 and the take-up reel 13. The sheet 8 is magnetized in multiple poles. When the sheets 8 are accumulated in the buffer mechanism without stopping the rotations of the supply reel 12 and the take-up reel 13, from the position I in FIG.
The composite permanent magnets 9a and 9b can be moved in the direction orthogonal to the longitudinal direction of the sheet 8 to the position of III through the position of.

After that, the sheet 8 of the length accumulated in the buffer mechanism is sent to the take-up reel 13, and the sheet 8 is moved by the length of the magnetizing width W _L. Subsequently, by accumulating the sheet 8 in the buffer mechanism, the progress of the sheet 8 at the portion facing the composite permanent magnets 9a and 9b is locally stopped. Meanwhile, the composite permanent magnets 9a and 9b are returned from the position III to the position II and then to the position I. After moving the composite permanent magnets 9a, 9b in one direction,
While moving the sheet 8 in the longitudinal direction, the composite permanent magnet 9
It is not necessary to increase the distance between a and 9b and the seat 8,
This interval may be constant.

By repeating the above series of operations,
It is possible to continuously perform multipolar magnetization on the long sheet 8 without stopping the rotations of the supply reel 12 and the take-up reel 13. Therefore, it becomes possible to continuously perform the orientation of the easy axis of magnetization and the multi-pole magnetization on the roll-shaped magnetic attraction sheet. Alternatively, it is also possible to apply a magnetic coating material to a roll-shaped non-magnetic support and then continuously perform the orientation of the easy axis of magnetization and the multipolar magnetization.

[0058]

EXAMPLES The magnetic attraction sheet and the method of magnetizing the same according to the embodiments of the present invention will be described below based on examples. However, the embodiment of the present invention is not limited to the following examples.
First, the following composition components were mixed by a ball mill and uniformly dispersed to prepare a magnetic coating material.

[0059] (Magnetic paint material)   Magnetic powder Sr ferrite 100 parts by weight   Binder Polyester polyurethane resin 10.8 parts by weight             Cellulose acetate butyrate (CAB) 4.6 parts by weight   Solvent Methyl ethyl ketone 66 parts by weight

The Sr ferrite powder has an average particle size of 1.
Isotropic particles with 2 μm, saturation magnetization σ _S = 59 (emu / g), and coercive force Hc = 2800 (Oe) were used. As the polyester polyurethane resin, a trade name Nipolan (manufactured by Nippon Polyurethane Co., Ltd.) and a number average molecular weight Mn = 300
00, glass transition point Tg = −10 (° C.) was used. As the cellulose acetate butyrate, Tg = 101 (° C.) manufactured by Eastman Chemical Co. was used.

A hardener (trade name: Coronate H
L (manufactured by Nippon Polyurethane Co., Ltd.)), and then a coating speed of 2 m / mi using a knife coater.
n was applied to the back surface of the inkjet-compatible receiving layer of the base material white synthetic paper with an inkjet-compatible receiving layer (total thickness 0.09 mm, trade name: TOYOJET (manufactured by Toyobo Co., Ltd.)).

Subsequently, the coating film is dried while passing through an orienting device (see FIG. 2) with an in-plane orienting magnetic field of 2.5 kG by facing the same poles of the permanent magnets, and the easy axis of magnetization of the magnetic powder is advanced in the substrate. Oriented. Further, it was stored in an environment of 60 ° C. for 20 hours or more and cured to obtain a raw sheet of a magnetic layer having a thickness of 0.06 mm and a total thickness of 0.15 mm.

A pair of composite permanent magnets (see FIG. 3), which were laminated so as to face each other with different polarities, were arranged on both surface sides of the above-mentioned sheet material, and were obliquely magnetized as shown in FIG. .
As the magnetizing permanent magnet, an Nd-Fe-B magnet having a residual magnetic flux density Br of 1 T or more was used. The thickness of the flat plate-shaped permanent magnet 10 constituting the composite permanent magnets 9a and 9b in FIG. 3 is 2 m.
m. The thickness of the flat plate-shaped permanent magnet 10 corresponds to the magnetizing pitch P of the multi-pole magnetizing.

The magnetizing pitch P was determined as follows.
First, the magnetization pitch P that maximizes the magnetic attraction force was predicted to be 1.8 to 2.5 mm by simulation. Based on this, the magnetization pitch P (thickness of the plate-shaped permanent magnet 10) is 1.0 mm, 1.3 mm, 1.5 mm, 1.8 mm,
2.0mm, 2.5mm, 3.0mm or 3.5mm
When eight types of composite permanent magnets were actually manufactured and tested, the optimum magnetization pitch P was 2.0 mm.

The length of the magnet array corresponding to the magnetizing width W _L in FIG. 5 was set to 300 mm. The distance between the composite permanent magnets on both sides of the original was 0.5 mm. The surface magnetic flux density of the magnet row of one composite permanent magnet was set to 3000 G or more at the maximum. As shown in FIGS. 4 and 5, when the composite permanent magnets 9a and 9b are moved in the direction A orthogonal to the longitudinal direction (easy-axis direction of magnetization) B of the sheet, the moving speed V _{S of the} sheet and the movement of the composite permanent magnet. The inclination angle θ of the magnetization changes according to the speed V _M.

Three kinds of magnetic adsorption sheets having the magnetization inclination angles θ of 0 °, 30 ° and 45 ° were prepared, and the surface magnetic flux density and the magnetic adsorption force of the magnetic adsorption sheets were measured. The surface magnetic flux density was measured by using a bell Gauss meter (type 4048) and a transverse type probe (T-4048-001) and measuring the maximum value of the magnetic flux density in the direction perpendicular to the magnetic layer surface of the magnetic layer surface. The average value was measured at arbitrary 5 points.

For the magnetic attraction, each sample of the magnetic attraction sheet was cut into a size of 50 mm × 50 mm, a resin plate having the same shape as the sheet was attached to the back side of the magnetic layer with an adhesive, and the sheet was fixed horizontally. The minimum peeling force at the time of magnetically adsorbing on a steel plate having a thickness of 0.5 mm and peeling vertically upward from the steel plate was calculated by measuring with a spring balance. {Peeling force- (sheet weight +
Adhesive weight + resin plate weight)} / sheet area = magnetic attraction.

As shown in FIG. 4, when the direction of the easy axis of magnetization and the direction of multipole magnetization coincide (when θ is 0 °), the surface magnetic flux density of the magnetic attraction sheet is 55 G, and the magnetic attraction force is It became 0.53 gf / cm ² . As shown in FIG. 5, when the relative moving direction of the composite permanent magnet is inclined 30 ° from the direction orthogonal to the easy axis of magnetization (when θ is 30 °), the surface magnetic flux density of the magnetic adsorption sheet is 53 G, and the magnetic adsorption is 53 G. Power is 0.43
It became gf / cm ² .

When the relative moving direction of the composite permanent magnet is inclined 45 ° from the direction orthogonal to the easy axis of magnetization (when θ is 45 °), the surface magnetic flux density of the magnetic attraction sheet is 44 G and the magnetic attraction force is 0. It became 30 gf / cm ² . The above results
It is summarized in Table 1.

[0070]

[Table 1]

As shown in Table 1, the inclination angle θ of the magnetization is 45
In the case of °, the magnetic attraction force is 57 compared with the case where θ is 0 °.
%, The magnetic attraction force is practically insufficient. However, when θ is 30 °, 8 when θ is 0 °
A magnetic adsorption force of about 1% was obtained, and it was confirmed that there was no practical problem.

By increasing the inclination angle θ of the magnetization,
Although the magnetic attraction force decreases, the moving speed of the magnetized sheet can be increased. Therefore, it becomes possible to continuously perform a series of steps including orientation of the easy axis of magnetization and multi-pole magnetization, or further application of a magnetic coating material on a sheet conveyed at a constant speed. Therefore, the throughput of the magnetic attraction sheet can be improved and the manufacturing cost can be reduced.

According to the method of magnetizing the magnetic attraction sheet of the present embodiment described above, multi-pole magnetization is continuously and inexpensively performed on a sheet in which the easy axis of magnetization is oriented in the longitudinal direction, and magnetic attraction is sufficient for practical use. A magnetically attractable sheet having force is obtained. The embodiments of the magnetic attraction sheet and the magnetizing method and manufacturing method thereof of the present invention are not limited to the above description. For example, the tilt angle θ of the magnetization, the moving speed V _{S of the} sheet, and the moving speed V _M of the composite permanent magnet that determine the tilt angle θ of the magnetization are arbitrarily changed as long as the magnetic attraction force is practically sufficient. it can. Other,
Various changes can be made without departing from the scope of the present invention.

[0074]

According to the magnetic attraction sheet of the present invention, continuous multipole magnetization can be performed. According to the method for magnetizing a magnetic attraction sheet of the present invention, it is possible to continuously and inexpensively perform multipole magnetization on a long magnetic attraction sheet. According to the method for producing a magnetic attraction sheet of the present invention, the magnetic attraction sheet can be produced at low cost by continuously applying the magnetic paint, orienting the axis of easy magnetization and magnetizing the multi-poles.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a magnetic adsorption sheet of the present invention.

FIG. 2 is a schematic diagram showing a method for orienting the easy axis of magnetization of the magnetic adsorption sheet of the present invention in the in-plane direction.

FIG. 3 is a schematic view showing the principle of a method for magnetizing a magnetic attraction sheet according to the present invention.

FIG. 4 is a top view schematically showing a method of performing multi-pole magnetization in the direction of the easy axis of magnetization of the magnetic attraction sheet.

FIG. 5 is a top view schematically showing a method of continuously performing multipolar magnetization in an oblique direction with respect to the easy magnetization axis direction of the magnetic attraction sheet according to the first embodiment of the present invention.

FIG. 6 is a top view schematically showing a method of continuously performing multipolar magnetization in an oblique direction with respect to the easy magnetization axis direction of the magnetic attraction sheet according to the first embodiment of the present invention.

FIG. 7 is a side view showing an example of a magnetizing device used in the method for magnetizing a magnetic attraction sheet according to the present invention.

FIG. 8 is a perspective view showing an example of a magnetizing device used in a method for magnetizing a magnetic attraction sheet according to the present invention.

FIG. 9 is a perspective view showing another example of the magnetizing device used in the method for magnetizing the magnetic attraction sheet of the present invention.

FIG. 10 is a perspective view showing another example of the magnetizing device used in the method for magnetizing the magnetic attraction sheet of the present invention.

[Explanation of symbols]

1 ... Magnetic adsorption sheet, 2 ... Non-magnetic support, 3 ... Magnetic layer,
4 ... Print receiving layer, 5 ... Coating film, 6a, 6b ... Permanent magnet, 7
... Magnetic force lines, 8 ... Sheet, 9, 9a, 9b ... Composite permanent magnet, 9c ... Magnet array, 10 ... Flat permanent magnet, 11a, 1
1b ... Holder, 12 ... Supply reel, 13 ... Take-up reel, 14, 14a, 14b ... Ball screw, 15a, 1
5b ... timing belt, 16, 20 ... guide roller,
17 ... FG, 18, 18a, 18b ... Motor with FG,
21, 22, 23, 24 ... Bearings, 25, 26 ... Pulleys, 27 ... Pinch rollers, 28 ... Linear guides.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shinichi Matsumura             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation

Claims (11)

[Claims] 1. A magnetic adsorption sheet having a magnetic layer formed by coating a non-magnetic support with a magnetic coating material in which a ferromagnetic powder is dispersed in a binder, wherein the magnetic layer is formed in a in-plane direction. A magnetic attraction sheet having an easy axis of magnetization and being multi-polarized so that the magnetization alternates in one direction in the in-plane direction and in a direction different from the direction of the easy axis of magnetization. 2. The magnetic attraction sheet according to claim 1, wherein the magnetic attraction sheet has an elongated shape, and an easy axis of magnetization is oriented in a longitudinal direction of the magnetic attraction sheet. 3. A print receiving layer is further provided on the surface of the non-magnetic support on the side where the magnetic layer is not formed.
The magnetic adsorption sheet described. 4. A step of orienting an easy axis of magnetization in a longitudinal direction of a long magnetic attraction sheet, and a plurality of flat plate-shaped permanent magnets magnetized in a direction parallel to the flat plate surface have mutually different polarities. A composite permanent magnet laminated with the surfaces facing each other, wherein the composite permanent magnet has an end surface in which different poles are alternately arranged, the end surface facing one surface of the magnetic attraction sheet, and the flat plate shape. The step of arranging so that the stacking direction of the permanent magnets and the easy axis of magnetization coincide with each other, and the gap between the end face and the magnetic attraction sheet is set to a value equal to or less than a predetermined value at which the magnetic attraction sheet is magnetized, While moving the adsorption sheet at a constant speed in the direction of the easy axis of magnetization, move the composite permanent magnet at a constant speed in a direction orthogonal to the easy axis of magnetization, and magnetize in an oblique direction with respect to the easy axis of magnetization. So that they alternate , Magnetizing method of magnetic sticking sheet and a step of performing a multi-pole magnetized in the magnetic sticking sheet. 5. A step of reciprocating the composite permanent magnet between both ends of the magnetic attraction sheet in a direction orthogonal to the easy axis of magnetization, the composite permanent magnet being provided from one end to the other end of the magnetic attraction sheet. The multi-pole magnetization is performed while the composite permanent magnet is moved from the other end of the magnetic attraction sheet to the one end, and the interval is made larger than the predetermined value to move the multi-pole magnetization. The method for magnetizing a magnetic attraction sheet according to claim 4, wherein magnetizing is not performed. 6. The interval is constant below the predetermined value,
The method for magnetizing a magnetic attraction sheet according to claim 4, wherein the multi-pole magnetization is performed by reciprocating the composite permanent magnet between both ends of the magnetic attraction sheet in a direction orthogonal to the easy axis of magnetization. 7. Another one of the composite permanent magnets is disposed so as to face the same pole as the composite permanent magnet through the magnetic attraction sheet, and a pair of the composite permanent magnets are moved in synchronization. The method for magnetizing a magnetic attraction sheet according to claim 4, wherein the multi-pole magnetization is performed. 8. A step of orienting an easy axis of magnetization in a longitudinal direction of a long magnetic attraction sheet, and a plurality of flat plate-shaped permanent magnets magnetized in a direction parallel to the flat plate surface have mutually different polarities. A composite permanent magnet laminated with the surfaces facing each other, wherein the composite permanent magnet has an end surface in which different poles are alternately arranged, the end surface facing one surface of the magnetic attraction sheet, and the flat plate shape. Arranging so that the stacking direction of the permanent magnets and the easy axis of magnetization coincide with each other; and the distance between the end face and the magnetic attraction sheet is set to a predetermined value at which the magnetic attraction sheet is magnetized or less, and the composite A method for magnetizing a magnetic adsorption sheet, comprising: moving a permanent magnet at a constant speed in a direction orthogonal to the easy axis of magnetization, and performing multipolar magnetization so that the magnetization is alternately inverted in the direction of the easy axis of magnetization. And the magnetic attraction sheet While moving at a constant speed in the direction of the easy axis of magnetization, the magnetic attraction sheet is locally accumulated, and the portion of the magnetic attraction sheet facing the composite permanent magnet is temporarily stopped to allow the multi-pole attachment. A method of magnetizing a magnetic adsorption sheet for magnetizing. 9. The other one of the composite permanent magnets is arranged so as to face the same pole as the composite permanent magnet through the magnetic attraction sheet, and a pair of the composite permanent magnets are moved synchronously. The method for magnetizing a magnetic attraction sheet according to claim 8, wherein the multi-pole magnetization is performed. 10. A step of applying a magnetic paint in which a ferromagnetic powder is dispersed in a binder onto a long non-magnetic support which moves in the longitudinal direction at a constant speed, and the magnetization of the ferromagnetic powder. A step of orienting an easy axis in the longitudinal direction of the non-magnetic support, a step of drying the magnetic paint to form a magnetic layer, an in-plane direction of the magnetic layer, and an oblique direction with respect to the easy axis of magnetization. So as to invert the magnetization alternately, a step of performing multi-pole magnetization on the magnetic layer, wherein the step of performing multi-pole magnetization is flat and magnetized in a direction parallel to the flat surface. A plurality of flat plate-shaped permanent magnets are laminated with the opposite pole faces facing each other, and the composite permanent magnet has end faces in which different poles are alternately arranged, and the end faces are at least in the magnetic layer. Opposing, and stacking direction of the flat permanent magnets and the easy axis of magnetization. And a step of arranging so as to match, the distance between the end face and the magnetic layer is equal to or less than a predetermined value by which the magnetic layer is magnetized, and the non-magnetic support is fixed in the direction of the easy axis of magnetization. And a step of moving the composite permanent magnet in a direction orthogonal to the easy axis of magnetization at a constant speed while moving at a speed. 11. A step of applying a magnetic paint in which a ferromagnetic powder is dispersed in a binder on a long non-magnetic support which moves in the longitudinal direction at a constant speed, and the magnetization of the ferromagnetic powder. A step of orienting the easy axis in the longitudinal direction of the non-magnetic support, a step of drying the magnetic paint to form a magnetic layer, and a magnetization in the in-plane direction of the magnetic layer and along the easy axis of magnetization. And a step of performing multi-pole magnetization on the magnetic layer so as to be alternately inverted. The step of performing the multi-pole magnetization includes a plurality of flat magnets magnetized in a direction parallel to the flat surface. A composite permanent magnet in which flat plate-shaped permanent magnets are laminated with the different pole surfaces facing each other, and the composite permanent magnet having end faces in which different poles are alternately arranged, the end faces face at least the magnetic layer, Moreover, the laminating direction of the flat plate-shaped permanent magnet and the easy axis of magnetization coincide with each other. So that the moving non-magnetic support is locally accumulated, and the non-magnetic support in the portion facing the composite permanent magnet is temporarily stopped, the end face and the magnetic The composite permanent magnet is moved at a constant speed in a direction orthogonal to the easy axis of magnetization with a gap between the layers being equal to or less than a predetermined value for magnetizing the magnetic layer, and the magnetization is alternated in the direction of the easy axis of magnetization. And a step of performing multi-pole magnetization so that the magnetic attraction sheet is reversed.