JP2003071978A - Magnetic attraction sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a magnetic attraction sheet which enables smooth execution of printing thereon even when a consumer ink-jet printer is used. SOLUTION: The magnetic attraction sheet being flexible is constituted of three layers: a base, a magnetic material layer formed on the surface of the base and constituted of a magnetic material prepared by mixing ferromagnetic powder with a binder and by dispersing them, and a printable layer presenting a surface whereon water-base ink can be fixed. Herein the magnetic material layer is magnetized so that the side opposite to the printable layer has properties of magnetic attraction, and the magnetic attraction sheet is provided in a state wherein the respective rear sides of two magnetic attraction sheets are opposed and joined to each other by the magnetic attraction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic sheet which has a magnetic attraction function and can be printed on the surface by a consumer printer.

[0002]

2. Description of the Related Art Conventionally, as a display device using a magnet,
There are bulletin boards called whiteboards or greenboards. This is generally an iron plate coated with white or green paint or a sheet, and is used by vertically mounting it on a wall surface. Writing and erasing can be performed on the bulletin board using a specific writing instrument, and permanent magnets of various shapes can be freely attached and detached for use.

Conventionally, the following two types of permanent magnets are often used in such bulletin boards. One is a small-sized permanent magnet having a diameter of several cm or less, which is generally button-shaped or quadrangular, and is mostly made of a hard material such as a ferrite sintered body. A resin cover of various colors is attached to one side and is used to indicate a position in the bulletin board or to temporarily fix the paper piece on the bulletin board. The other is a relatively large, thin-walled permanent magnet, which has flexibility, and most of the permanent magnets used are rubber magnets in which magnetic powder is dispersed in a rubber sheet. .

The conventional permanent magnet having flexibility (hereinafter referred to as a magnetic attraction sheet) will be described in more detail with reference to FIG. FIG. 5 is a diagram showing a configuration of a conventional magnetic attraction sheet, and the magnetic attraction sheet 501 is composed of a rubber sheet 502 and a color sheet 503. Magnetic powder 504 is dispersedly contained inside the rubber sheet 502, and when magnetized, the magnetic attraction sheet 5 is formed.
01 is given magnetic attraction. The rubber sheet 502 and the color sheet 503 are joined to each other with an adhesive or a pressure sensitive adhesive.

As the color sheet 503, flexible plastic such as vinyl chloride or polypropylene is used. The role of the color sheet 503 is to cover the surface of the magnetic attraction sheet 501 (the surface facing the magnetic attraction surface) with a colorful color, and to allow the user to write on the surface of the magnetic attraction sheet 501 with a writing instrument such as an oil pen. Is to Even if the color sheet 503 does not exist, the user can directly write on the surface of the rubber sheet 502 with an oil-based pen or the like, but the rubber sheet 502 generally exhibits a black or dark color, which is not practical. .

If the color sheet 503 is set to a bright bright color, a clear display can be obtained when the user writes with a black or red oil-based pen. Since the magnetic attraction sheet 501 is not only flexible but also capable of being cut, the user can freely cut a large magnetic attraction sheet and use it as a magnetic attraction sheet of any shape. Instead of using the color sheet 503 and the adhesive or pressure-sensitive adhesive, instead of the rubber sheet 50,
There is also a product in which an organic paint is directly applied or printed on the surface of 2.

[0007]

As described above, in the magnetic attraction sheet used in the conventional bulletin board, the user directly writes with an oil-based pen or the like to display the design / information on the surface. Was there. However, there is a limit to the design that can be expressed only by human writing, and it is difficult to express freely. For example, when the object to be displayed is a character, it is often more preferable to display a printed character than a handwritten character in terms of designability and readability.

Further, when it is desired to display / reproduce an existing design such as a photograph or a painting on the magnetic attraction sheet as it is, it is difficult to reproduce it by handwriting. The solution in this case is to reproduce the desired design on the magnetic adsorption sheet using a machine such as a printing machine.
However, in the past, since a printing machine or the like that can be freely used by the user has not been popularized, a solution using such a printing machine or the like cannot be said to be a realistic selection means. . However, in recent years, with the widespread use of personal computers and consumer color printers, it has come to be considered that a user directly prints an arbitrary design in color on a magnetic attraction sheet as a realistic solution.

Here, a method of using a personal computer and a consumer color printer as a means for a user to print a design directly in color on a magnetic attraction sheet will be examined. First, there is no particular problem with regard to the user freely creating a desired color design using a personal computer.

Next, generally used consumer printers are printers of the type that print on plain paper, and most of them are of the inkjet type and the color laser type.
It is a kind. Among them, the color laser method has a step of winding an object to be printed (generally plain paper) around a rotating drum 3 to 4 times while heating the object to be printed. , Is difficult at this time.

On the other hand, in the ink jet printer system, the printing process is completed only by passing the printed object under the printing nozzle once, and there is no heating process. I think it is a promising means.

However, when the ink jet printer system is used as the printing means for the magnetic attraction sheet, there are the following problems.

The first problem is that the ink printed by the ink jet printer system is generally a water-based ink. As described above, the surface of the conventional magnetic adsorption sheet, that is, the printing surface, is generally hydrophobic, and only oily ink can be written on it. The surface property of the magnetic attraction sheet depends on the material of the color sheet. The surface of flexible plastic such as vinyl chloride or polypropylene, which is a common material for color sheets, is usually
It is hydrophobic, and even if a water-based ink is forcibly printed by an inkjet printer system, the water-based ink does not soak into the magnetic adsorption sheet and only weakly adheres to the surface. Therefore, after the water-based ink is dried, it is peeled off from the surface only by applying a weak external force. Therefore, it is impossible in reality to directly color-print a design on a conventional magnetic adsorption sheet by a consumer inkjet printer method.

The second problem is that the printed magnetic attraction sheet has magnetic attraction. The inkjet printer system for consumer use is generally developed with printing on plain paper in mind, and printing on an object having magnetic attraction such as a magnetic attraction sheet is not particularly considered.
Therefore, if the printer uses a component made of a material that has magnetic attraction, such as iron, the magnetic attraction sheet may stick to the component and stop during printing, making it impossible to pass through the printer. There is.

Further, the magnetic attraction sheets may attract each other due to the magnetic force, so that two sheets may be fed during printing. The most reliable solution in the above case is to provide the user with the magnetic attraction sheet as it is when it is not attached, and the user magnetizes and uses the magnetic attraction sheet after printing.
Normally, it cannot be expected that the general user owns the magnetizing device and is in an environment where it can be used freely. Therefore, this method is an unrealistic solution. Therefore, there has been a demand for a method for providing a magnetically attractable sheet that does not cause a problem when the magnetized magnetically attractable sheet passes through the printer during printing.

Of the above two problems, the problem of printing with an aqueous ink by an ink jet printer system is that the printable layer is prepared by mixing hydrophilic fine particle powder with a binder having polyvinyl alcohol or the like as the base material or magnetic material. The problem is solved by applying or printing on the surface of the body layer to form a layer and then forming. In other words, the magnetic attraction sheet has three layers of a base material, a magnetic layer, and a printable layer, or a coloring layer for determining the surface color of the magnetic attraction sheet is added.
Layer (The printable layer may also serve as the coloring layer, in which case 3
Layer) and by forming the magnetic layer, the printable layer and the color forming layer by coating or printing, the thickness of the magnetic adsorption sheet can be suppressed to be thin enough to be printed by a printer.

Whether or not the conventional magnetically attracting sheet having magnetically attracting property is attracted and fixed to the component in the printer is determined by the component having the magnetically attracting property in the vicinity of the path through which the print object in the ink jet printer passes. It depends on whether or not it is present, but since general inkjet printers do not assume the use of printing on a magnetic adsorption sheet at all, in many consumer printers, the magnetic adsorption property is actually found near the path in the vicinity of the path. It has been confirmed that there is a part of the above, and if it remains as it is, it will hinder the printing of the magnetic adsorption sheet.

Therefore, it is an object of the present invention to provide a magnetic attraction sheet which can be printed on a magnetic attraction sheet without trouble even if a consumer inkjet printer is used.

[0019]

According to the present invention, even in a consumer inkjet printer, even when a part having magnetic attraction is used in the vicinity of a path through which an object to be printed passes. 1 shows a magnetically adsorbing sheet capable of favorably performing color printing on the surface, and a method for providing the same sheet.

In the consumer inkjet printer, when a part having magnetic attraction is used in the vicinity of the path through which the print object passes, in order for the magnetic attraction sheet to pass through the printer without any problem, It is necessary to minimize the number of lines of magnetic force that leak from the magnetic attraction sheet and pass through the component having the magnetic attraction when passing. Actually, the position and size of the magnetically attracting component are various, so it is necessary to suppress the number of magnetic force lines leaking from the magnetically attracting sheet. For that purpose, the magnetic attraction performance of the sheet may be lowered to make it a weak magnet, but in that case, the usage performance of the sheet after printing is deteriorated. Therefore, a method of reducing only the number of magnetic lines of force leaking during printing by a consumer inkjet printer will be taken without deteriorating the magnetic attraction performance of the magnet sheet.

That is, no magnetic pole is provided on the printable surface side of the magnetic attraction sheet, and a multipole magnetic pole is arranged only on the opposite surface. Next, the two magnetically attracted sheets that have been magnetized, the surface opposite to the printable surface (hereinafter referred to as the back surface).
Face each other and stick the magnetized surfaces together by the magnetic force of each other. In this configuration, most of the magnetic field lines extending from the back surface of the magnetic attraction sheet are sucked into the back surface of the other magnetic attraction sheet that faces the magnetic attraction sheet. There is no. The user first prints the desired design on both sides with a consumer inkjet printer, with the two magnetic attraction sheets stuck together, and then
Both are peeled off and used as two magnetic adsorption sheets.

In order to minimize leakage of magnetic force lines from other than the back surface of the magnetically attracting sheet, it is necessary to select a magnetizing method such that magnetic poles are regularly formed on only one surface of the sheet when magnetizing. . In addition, a layer of a magnetic material with high magnetic permeability and low coercive force is newly provided on the printable surface side of the magnetic adsorption sheet to act as a yoke, and measures are taken to prevent leakage of magnetic force lines from the printable surface side. Good. Alternatively, a method of magnetizing the magnetic attraction sheet may be carried out after the two sheets of the same sheet have been bonded together so that magnetic poles are provided so that magnetic force lines circulate in the two sheets of the same sheet. This method obtains particularly good results when the above-mentioned magnetic layer having high magnetic permeability and low coercive force is provided. Further, a non-magnetic sheet for peeling may be sandwiched between two magnetic attraction sheets so that the user can easily peel off the magnetic attraction sheets after printing.

Further, in this case, in order to make the peeling work of the user easier, the sandwiched non-magnetic sheet or the two magnetic attraction sheets may be provided with notches in advance, or conversely, the non-magnetic sheet or the magnetic sheet. The suction sheet may be provided with a tab (protrusion). That is, the present invention includes a base material made of a resin, a magnetic material layer formed on the surface of the base material, the magnetic material layer being made of a magnetic material obtained by mixing and dispersing a ferromagnetic powder with a binder, and the base material or A flexible magnetic adsorption sheet including at least three printable layers formed on the surface of the magnetic layer, the printable layer having a surface on which an aqueous ink can be fixed, and the surface opposite to the printable layer. The magnetic layer is magnetized so that the (rear surface) has magnetic attraction, and the two magnetic attraction sheets are provided in a state where the back surfaces are opposed to each other and are joined to each other by magnetic attraction. Is a magnetic adsorption sheet.

That is, the present invention comprises a base material made of paper, synthetic paper, synthetic resin or the like, and a magnetic material formed on the surface of the base material by mixing and dispersing a ferromagnetic powder with a binder. A magnetic attraction sheet having three layers of a magnetic layer and a printable layer on which a water-based ink can be fixed, and the surface opposite to the printable layer has magnetic attraction. And the magnetic layer is magnetized so that the back surfaces of the two magnetic adsorption sheets face each other,
It is a magnetic attraction sheet that is bonded to each other by magnetic attraction.

Further, according to the present invention, the printable layer is a magnetic adsorption sheet formed on at least one of the surface of the substrate and the surface of the magnetic layer.

The present invention also comprises a base material made of paper, synthetic paper, synthetic resin or the like, and a magnetic material formed on the surface of the base material by mixing and dispersing ferromagnetic powder with a binder. Magnetic layer, a high magnetic permeability magnetic powder mixed with a binder and dispersed therein, a high magnetic permeability layer made of a magnetic material, and a printable layer having a surface on which an aqueous ink can be fixed. In a flexible magnetic attraction sheet, the magnetic layer is magnetized so that the back surface of the magnetic attraction sheet has magnetic attraction, and the back surfaces of the two magnetic attraction sheets are opposed to each other. It is a magnetic adsorption sheet bonded to each other by adsorption.

In the present invention, the printable layer is a magnetic adsorption sheet formed on at least one of the surface of the base material and the surface of the magnetic layer.

Further, the present invention is a magnetic attraction sheet formed on at least one of the high magnetic permeability layer, the surface of the base material and the surface of the magnetic layer.

The present invention also provides a base material made of paper, synthetic paper, synthetic resin or the like, and a magnetic material formed on the surface of the base material by mixing and dispersing ferromagnetic powder with a binder. In a flexible magnetic adsorption sheet composed of three layers of a magnetic layer composed of and a printable layer exhibiting a surface on which a water-based ink can be fixed, the back surfaces of two magnetic adsorption sheets are opposed to each other. After joining, the two magnetic layers are magnetized to impart magnetic attraction, and the two magnetic attraction sheets are joined together.

In the present invention, the printable layer is a magnetic adsorption sheet formed on at least one of the surface of the base material and the surface of the magnetic layer.

Further, according to the present invention, a base material made of a resin such as paper, synthetic paper or synthetic resin, and a ferromagnetic powder formed on the surface of the base material are mixed and dispersed with a binder. A magnetic layer made of a magnetic material, a high magnetic permeability layer made of a magnetic material obtained by mixing and dispersing a high-permeability magnetic powder with a binder, and a printable layer having a surface on which an aqueous ink can be fixed. In the constituted magnetic attraction sheet having flexibility, after the back surfaces of the two magnetic attraction sheets are opposed to each other and bonded to each other, magnetization is performed to impart magnetic attraction to both the magnetic layers, It is a magnetic attraction sheet in which the two magnetic attraction sheets are joined together.

Further, the present invention is the magnetic attraction sheet, wherein the printable layer is formed on at least one of the surface of the base material and the surface of the magnetic layer.

Further, the present invention is a magnetic adsorption sheet formed on at least one of the high magnetic permeability layer, the surface of the base material and the surface of the magnetic layer.

Further, according to the present invention, in the magnetic attraction sheet, a non-magnetic sheet is sandwiched between two magnetic attraction sheets whose back surfaces are opposed to each other, and they are joined to each other by magnetic attraction.

Further, the present invention is the above-mentioned magnetic attraction sheet, wherein two magnetic attraction sheets whose back surfaces face each other are provided with notches at one location or at a plurality of locations respectively.

Further, the present invention is the above magnetic attraction sheet, wherein the non-magnetic sheet is provided with tags at one or more locations.

According to the present invention, in the magnetic attraction sheet, two magnetic attraction sheets whose back surfaces are opposed to each other are provided with notches at one location or a plurality of locations, respectively, and one location is provided on the non-magnetic sheet. Alternatively, the magnetic attraction sheet is provided with tags at a plurality of locations.

[0038]

BEST MODE FOR CARRYING OUT THE INVENTION A magnetic attraction sheet according to an embodiment of the present invention will be described below.

(Embodiment 1) Embodiment 1 of the present invention
The magnetic attraction sheet according to the present invention will be described below. Figure 1
FIG. 3 is an explanatory diagram of a magnetic attraction sheet according to Embodiment 1 of the present invention. Of these, in FIG. 1A, two magnetic attraction sheets 101 and 102 each including three layers of a base material, a magnetic layer, and a printable layer (individually not shown) are placed so that their back surfaces face each other. FIG.
FIG. 1B is a schematic cross-sectional view showing an example of a method of magnetizing the magnetic attraction sheet shown in FIG. 1A, and FIG. 1C is a magnetization diagram different from that of FIG. 1B of the magnetic attraction sheet. It is a schematic cross section which shows the example of a method. In FIG. 1, the base material is a film made of PET and is characterized by having flexibility and toughness.

The magnetic layer is a layer formed by coating or printing by dispersing ferromagnetic powder in a binder, and the ferromagnetic powder used preferably has a high coercive force. Therefore, powders of rare earth magnets such as SmCo, SmFeN, and NdFeB are suitable, and Sr ferrite, which is a ferrite having a relatively high coercive force, can also be used. The smaller the particle size of the ferromagnetic powder, the thinner the magnetic layer can be made, but the particle size is in the range of 2 to 10 μm on average due to conditions such as workability. Also,
Polyurethane resin is suitable as the binder to be used, but it is not limited to polyurethane resin as long as it is a resin having high adhesion to PET which is the synthetic resin used as the base material.

On the other hand, the printable layer is made of a binder such as polyvinyl alcohol containing hydrophilic fine powder. Hydrophilic fine powders include silica, silica gel, diatomaceous earth, glass beads,
It is composed of at least one kind of particles selected from protein particles and polyvinylpyrrolidone (PVP) particles. The printable layer is a layer located on the surface of the magnetic adsorption sheet, and a layer containing the resin and the hydrophilic fine powder is applied or printed on the base material or the magnetic layer.
After that, the coated or printed surface is formed by heating and curing. The fine irregularities on the surface of the printable layer and the fine voids in the layer that occur at that time play a role of further improving the fixability of the water-based ink during printing on the printable layer. The addition of the hydrophilic fine powder is involved in the formation of the fine irregularities and voids.

Although it is expected that the user will directly write on the surface of the magnetic adsorption sheet with an aqueous pen or an oil pen, the printable layer is only hydrophilic as the original property of the resin. Because it is also lipophilic,
It can be handled without problems. Here, a color forming layer which is a resin layer containing an opaque color forming agent having good color forming property may be provided inside the printable layer. In this case, a pigment is generally used as the color former contained. In FIG. 1, the printable layer (not shown) is, of course, always located on the surface of the magnetic adsorption sheet, but the order of the base material and the magnetic layer does not matter. Any of them may be arranged on the back surface, and in any case, they can be favorably used as a magnetic adsorption sheet.

FIG. 1B shows one magnetic attraction sheet 10.
4 shows an example relating to a method of applying a magnetic field from the outside. In order to form a magnetic pole only on the back surface of the magnetic attraction sheet 104, the magnetic pole 1 provided in the magnetic field applying device 103 is shown.
06 and 107 are oriented in the same direction. When magnetized, the magnetic poles 106 and 107 are arranged so as to be in contact with the back surface of the magnetic attraction sheet 104, and a current is passed through the magnetic field applying device 103 to cause the magnetic attraction sheets 10 to move from the magnetic attraction sheets 10 and 107.
It is magnetized by radiating a strong magnetic field into the magnet.

At this time, as shown in FIG. 1B, a high magnetic permeability plate 105 may be arranged on the printable surface side of the magnetic attraction sheet 104 during magnetization. This high magnetic permeability plate 105 is
The role of the yoke has an effect of further improving the attraction force of the magnetic attraction sheet 104. It is generally preferable that the magnetization pattern on the back surface of the magnetic attraction sheet 104 is in the form of stripes. It may be a magnetic pattern. After magnetizing a plurality of magnetic attraction sheets, the back sides of two of the magnetic attraction sheets are made to face each other to be attracted and the lines of magnetic force are confined inside the two magnetic sheets to reduce the leakage flux to the outside. Provide as a product to users.

On the other hand, FIG. 1C shows a case where the magnetic attraction sheet is magnetized differently from FIG. 1B. First, the back surfaces of two non-magnetized magnetic attraction sheets are shown. The two are brought into contact with each other, and magnetized by the magnetic field applying device 108 in this state. Unlike the magnetizing device shown in FIG. 1B, the magnetic poles 113 and 114 of the device to be used are installed on both sides of the two magnetic attraction sheets 109 and 110, and between the magnetic poles facing each other when magnetizing. A magnetic field is formed across the magnetic attraction sheet. When magnetized, as shown in FIG.
A high magnetic permeability plate 1 is provided on both outer sides of the magnetic attraction sheets 109 and 110.
You may arrange 11,112.

As in the case of the embodiment of FIG. 1 (b),
The high magnetic permeability plates 111 and 112 serve as a yoke,
The attraction force of the magnetic attraction sheets 109 and 110 will be further improved. As in the case of FIG. 1B, it is preferable that the magnetic attraction patterns on the magnetic attraction sheets 109 and 110 be in the form of stripes, but the distribution shape and the total area of the N-pole and S-pole regions are summed. However, if they are almost the same, other magnetization patterns may be used. The two magnetically attracted sheets 109 and 110 after magnetization are provided to the user as a product with their back surfaces being attracted to each other.

(Second Embodiment) A magnetic attraction sheet according to a second embodiment of the present invention will be described below. Figure 2
It is explanatory drawing of the magnetic adsorption sheet by Embodiment 2 of this invention. 2A is a cross-sectional view of a magnetic attraction sheet having a high magnetic permeability layer, and FIG. 2B is a schematic cross-sectional view showing an example of a method of magnetizing the magnetic attraction sheet shown in FIG. 2A. Is.

FIG. 2A shows an embodiment of a magnetic attraction sheet having a structure different from that of the magnetic attraction sheet shown in FIG. 1 above, and includes a substrate 201, a magnetic layer 202, and a printable layer 203. In addition, a high magnetic permeability layer 204 is provided inside the printable layer 203. The high-permeability layer 204 is a mixture of high-permeability / low-coercive magnetic powder with an organic binder and a solvent, and is formed by printing or coating on the surface of the base material or the magnetic layer. Permalloy alloy powder is suitable as the magnetic powder to be used. The printable layer 203 is further laminated on the surface of the high magnetic permeability layer 204, and is formed by irradiation with ultraviolet rays.

If necessary, a color-developing layer (not shown) may be provided below the printable layer 203, or the printable layer itself may have the function of the color-developing layer. In the magnetic adsorption sheet thus formed, the high magnetic permeability layer 204
Acts as a yoke after being magnetized. That is, the magnetic lines of force starting from the S pole formed in the magnetic layer 202 by magnetization reach the high magnetic permeability layer 204, penetrate through it, and reach the adjacent N pole of the magnetic layer 202. Go through the route. For this reason, when the back surfaces of the two magnetic attraction sheets are attracted to each other after magnetization, the lines of magnetic force leaking to the outside of the magnetic attraction sheet become very small, and therefore, when printing with a consumer inkjet printer,
It is possible to prevent an accident in which the magnetic adsorption sheet stops without being conveyed.

Further, FIG. 2B shows an embodiment relating to a method of applying a magnetic field from the outside to one magnetic attraction sheet 212. Only the back surface of the magnetic attraction sheet 212 has an N pole and an S pole. The magnetic poles 210 and 211 of the magnetic field applying device 209 are all installed on the same side for the purpose of forming Magnetization is continued while moving the magnetic attraction sheet 212 to sequentially form an N pole and an S pole. Dotted lines in the figure show lines of magnetic force generated in the magnetic attraction sheet by the created N pole and S pole, and the lines of magnetic force starting from the S pole penetrate through the high magnetic permeability layer 208 and are adjacent to each other. It goes through a semicircular path that reaches the pole.

As in the case of FIG. 1, the magnetic attraction sheet 21
It is preferable that the magnetization pattern on the back surface of No. 2 has a stripe shape, but if the distribution shapes and the total areas of the N-pole and S-pole regions are almost the same, then other magnetization patterns may be used. Good. After the plurality of magnetic attraction sheets are magnetized, the back sides of the two magnetic attraction sheets are made to face each other and attracted to each other, thereby providing the user with a state in which there is almost no leakage magnetic flux to the outside as a product.

(Embodiment 3) Embodiment 3 of the present invention
The magnetic attraction sheet according to the above will be described below. Figure 3
FIG. 7 is an explanatory diagram of a magnetic attraction sheet according to a third embodiment of the present invention. FIG. 3 shows two magnetic attraction sheets 301 and 30.
2 shows a magnetic attraction sheet having a configuration in which one non-magnetic sheet 303 is sandwiched between two. The magnetic adsorption sheet is made very thin (generally several hundreds of μm) in order to enable printing with a consumer inkjet printer. Therefore, it is not easy for the user to peel off the two magnetic attraction sheets after printing both sides with the printer.

As a countermeasure against this, one non-magnetic sheet is sandwiched between two magnetic attraction sheets. As the non-magnetic sheet, silicon coated paper having both sides smoothed is suitable, and tabs (ears) or notches may be provided as necessary. When the tab is provided on the non-magnetic sheet, the user can easily peel off the two magnetic attraction sheets by using the tab as a clue.

(Embodiment 4) Embodiment 4 of the present invention
The magnetic attraction sheet according to the present invention will be described below. Figure 4
FIG. 9 is an explanatory diagram of a magnetic attraction sheet according to Embodiment 4 of the present invention, in which three sheets are displayed in this order on the back surface of the magnetic attraction sheet, the non-magnetic sheet, and the printable surface of the magnetic attraction sheet. FIG. 4A is a diagram showing a case where the tabs and notches are provided only on the non-magnetic sheet, and FIG. 4B is a diagram showing a case where the notches are provided only on the two magnetic attraction sheets. FIG. 4C is a diagram showing an example in which tabs or notches are provided on both of the two magnetic attraction sheets and the non-magnetic sheet.

Here, the user does not need to cut the non-magnetic sheet in order to peel off the two magnetic attracting sheets, but in order to mass-produce the magnetic attracting sheets without waste, the non-magnetic sheet is cut at the time of cutting. It is necessary to make a notch corresponding to the tab.

Of these, FIG. 4A shows an example in which tabs and notches are provided only on the non-magnetic sheet, and three sheets are provided on the back surface of the magnetic attraction sheet 401 and the non-magnetic sheet 40.
2. The printable surface of the magnetic attraction sheet 403 is arranged and displayed in this order.

Among these, the non-magnetic sheet 402 is provided with a semicircular tab and a cut corresponding to the tab, and the two magnetic attraction sheets 401 and 403 are both rectangular. Further, the outer dimensions of the three sheets excluding the tabs and cuts of the non-magnetic sheet 402 are the same.

In contrast, FIG. 4B shows an example in which a cut is provided only in the two magnetic attraction sheets, on the contrary, three sheets are provided on the back surface of the magnetic attraction sheet 404 and the non-magnetic sheet 40.
5, the printable surface of the magnetic attraction sheet 406 is arranged and displayed in this order. Of these, the magnetic adsorption sheet 404,
The 406 has two diagonal cuts, and the non-magnetic sheet 405 has a rectangular shape.

Further, FIG. 4 (c) shows an example in which tabs or cuts are provided on both the two magnetic attraction sheets and the non-magnetic sheet, and three sheets are attached to the magnetic attraction sheet 4.
07 back surface, non-magnetic sheet 408, magnetic attraction sheet 40
The printable surfaces of 9 are arranged and displayed in this order.

The magnetic attraction sheets 407 and 409 are provided with diagonal cuts at four positions, and the non-magnetic sheet 408 is provided with triangular tabs and cuts corresponding to the tabs. In each case, the outer dimensions of the three sheets excluding the tabs and the notches are the same. In addition, the positions, shapes, and numbers of the tabs and cuts in each of the magnetic attraction sheet and nonmagnetic sheet are not limited to those in the above-described embodiments.

(Embodiment 5) A magnetic attraction sheet according to Embodiment 5 of the present invention will be described below. Unmagnetized SmCo ferromagnetic powder 70w with an average particle size of 2 μm
t% and 30 wt% of a polyurethane-based organic binder (manufactured by Toyobo Co., Ltd., trade name Byron) are mixed to obtain a mixture, and the mixture is mixed with 1/2 equivalent of an organic solvent (40 wt% of methyl ethyl ketone). %, Toluene 40 wt
%, Cyclohexane 20 wt%), thickness 50μ
m PET film sheet was applied by gravure printing and then sufficiently dried to obtain a sheet-like printed matter.

Next, first, a polyurethane-based organic binder resin (manufactured by Nippon Polyurethane Industry Co., Ltd., product name Nipporan) containing a white color former is applied to the surface of the PET film by gravure printing and then sufficiently dried by a drier. -Cured, and the same binder as in Example 1 such as vinyl alcohol (Taisei Kako Co., Ltd., trade name AC
RIT) was mixed with 10 w% of silica gel powder having an average particle diameter of 10 nm, which was a hydrophilic fine powder, and was further applied by gravure printing on the surface on which the polyurethane-based organic bonding resin containing the white color former was printed.

Thereafter, similarly, a sheet-like printed matter was obtained by sufficiently drying and curing with a dryer. The obtained sheet-like printed matter is opaque, bright white, and flexible,
When the thickness of this printed sheet after curing was measured,
The average was 100 μm. In addition, the surface of the sheet-like printed matter was a slightly rough matte surface.

Next, a high-permeability sheet made of a resin containing permalloy powder is bonded to the printable surface side of the sheet-shaped product, and the inside of the magnetic field applying device having a plurality of magnetizing magnetic poles only on one side is set. It was passed and magnetized. At this time, by directing the back surface of the sheet-shaped product toward the magnetic pole side of the magnetic field applying device, N-poles and S-poles are formed in stripes only on this back surface to form a magnetic adsorption sheet.

After that, the high-permeability sheet was removed, two magnetic adsorption sheets were prepared, and the back surfaces were opposed to each other,
Magnetically adsorbed by sandwiching a silicon-coated paper having a cut in the tab and the cut portion in advance. The silicon-coated paper had a thickness of about 20 μm, and the total thickness of the bonded magnetic attraction sheet was 220 μm. This thickness is within a range that can be printed by a general inkjet printer. This joined magnetic attraction sheet was cut into a size of A4 size to obtain a magnetic attraction sheet product.
At the time of cutting, the blade of the cutting device was not passed through the tab portion of the silicon-coated paper, and the tab was left.

Next, the manufactured A4 size magnetic adsorption sheet product was mounted on a consumer inkjet printer (manufactured by Seiko Epson Corp., trade name PM-880C), and color printing was sequentially performed on both sides with aqueous ink. . At the time of printing, there were no problems such as the magnetic adsorption sheet product adsorbing to the printer and the sheet product being fed by two sheets, and a vivid printing result was obtained in which the design of the printing ink was contrasted on a white background. In addition, the work of peeling the printed magnetic attraction sheet product into two sheets can be done without difficulty using the tab of the silicon-coated paper as a clue, and each peeled magnetic attraction sheet is placed vertically on an iron plate. When they were brought close to the surface of each, they strongly adsorbed each other and did not slip off at all.

(Embodiment 6) Embodiment 6 of the present invention
The magnetic attraction sheet according to the present invention will be described below. First, as in the case of the fifth embodiment, first, a PE having a thickness of 50 μm is used.
A magnetic layer containing SmCo ferromagnetic powder is formed on a substrate made of a T film sheet by a reverse coater, and then a permalloy metal powder having an average particle size of 10 μm (made by TOKIN, trade name TMC-V is atomized. Crushed by the method,
(The surface of which has been rust-proofed), the polyurethane-based organic binder (same as above), and the organic solvent (same as above)
A mixture in which the above three components were mixed in a weight ratio of 7: 3: 5 was prepared and formed on the surface of the coated material by a reverse coater as well to form a high magnetic permeability layer. On the surface thereof, as in the case of Example 1, a color forming layer and a printable layer were sequentially formed by gravure printing and a drier.

The surface of the obtained sheet-like printed matter was opaque, bright white and flexible, and the thickness of the sheet-like printed matter after curing was measured and found to be 200 μm on average.
Met. In addition, the surface of the sheet-like printed material was a slightly rough matte surface.

Next, two sheets of this sheet-like product were prepared, and their back surfaces were opposed to each other, and the tabs and the silicon-coated paper in which cuts had been previously made were sandwiched therebetween and joined. The thickness of the silicon coated paper is about 20 μm, and the thickness of the joined sheets is 420 μm.
Met. This thickness is within a range that can be printed by a general inkjet printer.

Next, the bonded magnetic attraction sheet was magnetized by passing through a magnetic field applying device having magnetizing magnetic poles on both sides. At this time, the magnetic poles of the magnetic field applying device were periodically switched to the N pole and the S pole in accordance with the movement of the sheet, and the magnetization was performed so that the magnetized pattern had a stripe shape.

After the magnetization, since the region of the high magnetic permeability layer plays the role of the yoke, there are almost no lines of magnetic force leaking to the outside of the bonded magnetic attraction sheet. Then, this sheet was cut into a size of A4 size to obtain a magnetic adsorption sheet product. At the time of cutting, first, the joined sheets are cut into rectangles of A4 size, and then only the corner portions of the magnetic adsorption sheets on both sides are cut off diagonally, and the corner portions of the silicon coated paper in the center are cut. Was left as a tab.

The produced A4 size magnetic adsorption sheet product was
As in the case of Example 1, a consumer inkjet printer (manufactured by Seiko Epson Corporation, trade name PM-880) is used.
It was attached to C), and color printing was performed on both sides in order using a water-based ink. At the time of printing, there were no troubles such as the magnetic adsorption sheet product adsorbing to the printer or the feeding of two sheets, and a vivid printing result was obtained in which the design of the printing ink was contrasted on a white background.

In addition, the printed magnetic adsorption sheet product is
The work of peeling off onto a single sheet can be done effortlessly using the tab of silicon coated paper as a clue, and when each peeled magnetic attraction sheet is brought close to the surface of the vertically standing iron plate, it will strongly attract each other. I didn't slip at all.

From the above, since the magnetic adsorption sheet products produced in the above-mentioned Examples 1 and 2 are products in which two magnetic adsorption sheets are magnetically adsorbed with a non-magnetic sheet sandwiched therebetween, a consumer inkjet printer is used. It is a product that is easy for users to handle without fear of printing failures. Therefore, it can be said that the magnetic sheet has excellent performance not found in conventional magnet sheets, particularly in terms of ease of use.

[0075]

As described above, the magnetic adsorption sheet product of the present invention has the ability to adsorb with sufficient strength when used on a bulletin board or the like installed vertically on the wall surface by the user, and moreover, it can be used by the user. Can be freely cut, and the user can freely print the design on the surface of the consumer inkjet printer without any problem.

Since the magnetic attraction sheet product of the present invention has a structure in which two magnetic attraction sheets are sandwiched between non-magnetic sheets and magnetically attracted, the magnetic lines of force leaking from the surface of the product to the outside are extremely small, and There is no problem that the magnetic attraction characteristic of the magnetic attraction sheet itself causes the component to be attracted to the component parts of the printer or the sheet is fed by two sheets and the printing fails.

Further, the work of peeling off the two magnetic attraction sheets after printing can be easily carried out by the user using the central non-magnetic sheet and the tab formed there as a clue. From this, the present invention can provide a magnetic attraction sheet that has excellent performance not found in conventional magnet sheets in printing and has improved printing reliability.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a magnetic attraction sheet according to a first embodiment of the present invention. FIG. 1A is an external view when two magnetic attraction sheets are attracted with their back surfaces facing each other, and FIG. 1B is a method of magnetizing the magnetic attraction sheets shown in FIG. FIG. 1C is a schematic cross-sectional view showing an example of the above, and FIG. 1C is a schematic cross-sectional view showing an example of a magnetizing method of the magnetic attraction sheet different from FIG. 1B.

FIG. 2 is an explanatory diagram of a magnetic attraction sheet according to a second embodiment of the present invention. 2A is a cross-sectional view of a magnetic attraction sheet having a high magnetic permeability layer, and FIG. 2B is a schematic cross-sectional view showing an example of a method of magnetizing the magnetic attraction sheet shown in FIG. 2A.

FIG. 3 is an explanatory diagram of a magnetic attraction sheet according to a third embodiment of the present invention.

FIG. 4 is an explanatory diagram of a magnetic attraction sheet according to a fourth embodiment of the present invention. FIG. 4A is a diagram showing a case where a tab and a notch are provided only on a non-magnetic sheet, and FIG. 4B is a diagram showing a case where a notch is provided only on two magnetic attraction sheets.
FIG. 4C is a view showing a case where tabs or notches are provided on both of the two magnetic attraction sheets and the non-magnetic sheet.

FIG. 5 is a diagram showing a configuration of a conventional magnetic attraction sheet. Figure 5
5A is an external view of a conventional magnetic attraction sheet, FIG.
FIG. 4 is a schematic cross-sectional view of a conventional magnetic attraction sheet.

[Explanation of symbols]

101, 102, 104, 109, 110 Magnetic attraction sheet 103, 108 Magnetic field applying device 106, 107, 113, 114 Magnetic pole 105, 111, 112 High permeability plate 201, 205 Base material 202, 206 Magnetic layer 203, 207 Printing Possible layers 204, 208 High permeability layers 209 Magnetic field applying devices 210, 211 Magnetic poles 212 Magnetic attraction sheets 301, 302 Magnetic attraction sheets 303 Non-magnetic sheets 401, 403, 404, 406, 407, 409
Magnetic attraction sheet 402, 405, 408 Non-magnetic sheet 501 Magnetic attraction sheet 502 Rubber sheet 503 Color sheet 504 Magnetic powder

Continued front page    F-term (reference) 2H086 BA12 BA15 BA24                 4F100 AA17H AA33H AK42 AK51B                       AT00A AT00D BA05 BA06                       JD14C JD14E JG06 JG06B                       JG06E JK14 JL05 JL11

Claims (14)

[Claims] 1. A base material, a magnetic material layer formed on the surface of the base material, the magnetic material layer being formed by mixing and dispersing ferromagnetic powder with a binder, and a surface on which an aqueous ink can be fixed. In a flexible magnetic attraction sheet composed of three printable layers, the magnetic layer is magnetized so that the surface opposite to the printable layer has magnetic attraction. A magnetic attraction sheet characterized in that the two magnetic attraction sheets have their back surfaces opposed to each other and are joined to each other by magnetic attraction. 2. The magnetic attraction sheet according to claim 1, wherein the printable layer is formed on at least one of the surface of the base material and the surface of the magnetic layer. 3. A base material, a magnetic material layer formed on the surface of the base material, the magnetic material layer comprising a magnetic material obtained by mixing and dispersing a ferromagnetic powder with a binder, and a high permeability magnetic material powder as a binder. A magnetically adsorbing sheet having flexibility, which is composed of four layers: a high magnetic permeability layer made of a magnetic material mixed and dispersed with a printable layer having a surface on which water-based ink can be fixed. The magnetic layer is magnetized so that the back surfaces of the two are magnetically attractable, and the back surfaces of two magnetic attraction sheets are opposed to each other and are joined together by magnetic attraction. Sheet. 4. The magnetic adsorption sheet according to claim 3, wherein the printable layer is formed on at least one of the surface of the base material and the surface of the magnetic layer. 5. The magnetic adsorption sheet according to claim 3, which is formed on at least one of the high magnetic permeability layer, the surface of the base material and the surface of the magnetic layer. 6. A base material, a magnetic material layer formed on the surface of the base material, the magnetic material layer comprising a magnetic material prepared by mixing and dispersing a ferromagnetic powder with a binder, and a surface on which an aqueous ink can be fixed. In a flexible magnetic attraction sheet composed of three printable layers, the two magnetic attraction sheets have their back surfaces opposed to each other and are bonded to each other, and then the two magnetic layers have magnetic attraction properties. The magnetic attraction sheet is characterized in that it is magnetized in order to provide the magnetic attraction sheet, and the two magnetic attraction sheets are bonded to each other. 7. The magnetic attraction sheet according to claim 6, wherein the printable layer is formed on at least one of the surface of the base material and the surface of the magnetic layer. 8. A base material, a magnetic material layer formed on the surface of the base material, which is made of a magnetic material obtained by mixing and dispersing a ferromagnetic powder with a binder, and a high-permeability magnetic material powder are bonded together. In a flexible magnetic adsorption sheet composed of four layers, a high magnetic permeability layer made of a magnetic material mixed and dispersed with an agent, and a printable layer having a surface on which an aqueous ink can be fixed, After the back surfaces of the magnetic attraction sheets are opposed to each other and bonded to each other, they are magnetized to give magnetic attraction to both the magnetic layers, and the two magnetic attraction sheets are bonded to each other. And magnetic adsorption sheet. 9. The magnetic attraction sheet according to claim 8, wherein the printable layer is formed on at least one of the surface of the base material and the surface of the magnetic layer.
10. The magnetic adsorption sheet according to claim 8, which is formed on at least one of the high magnetic permeability layer, the surface of the base material and the surface of the magnetic layer. 11. The magnetic attraction sheet according to claim 1, wherein a non-magnetic sheet is sandwiched between two magnetic attraction sheets whose back surfaces are opposed to each other, and they are joined together by magnetic attraction. And magnetic adsorption sheet. 12. The magnetic attraction sheet according to claim 11, wherein two magnetic attraction sheets whose back surfaces are opposed to each other are provided with notches at one location or at a plurality of locations, respectively. . 13. The magnetic attraction sheet according to claim 11, wherein the non-magnetic sheet is provided with tags at one or more locations. 14. The magnetic attraction sheet according to claim 11, wherein two magnetic attraction sheets whose back surfaces are opposed to each other are provided with notches at one location or a plurality of locations, respectively, and one location is provided on the non-magnetic sheet. Alternatively, a magnetic adsorption sheet characterized in that tags are provided at a plurality of locations.