JP3193009B2 - Composite magnetic display panel for infants - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic display panel to be used for drawing by children, and to improve the structure by combining the material of a core block and a member for sealing the core block from both sides. And a composite magnetic display panel for an infant.

[0002]

2. Description of the Related Art Generally, as a drawing board for infants,
A honeycomb core having a large number of hexagonal cells was sealed between a transparent or translucent drawing face plate (substrate) and a face material facing the drawing face plate (substrate), and a plastic dispersion liquid containing magnetic particles was sealed in each of the cells. Magnetic picture plates are known.

[0003] In this method, a magnetic field is applied to a dispersion liquid by bringing the tip of a magnetic pen into contact with a drawing surface to cause magnetic particles to float on the drawing surface, and a difference in contrast between the dispersion medium and the magnetic particles is applied to the drawing surface. By displaying pictures and characters and moving the eraser bar under the substrate, the floating magnetic particles are submerged again to erase the pictures and characters.

[0004]

Incidentally, infants sometimes behave unpredictably. For example, the tip of the magnetic pen may strongly hit or hit the substrate of the magnetic picture plate. In this case, the drawing surface may be broken by the impact of the magnetic pen, or the wall of the honeycomb core made of synthetic resin may be deformed to break the adhesion between the drawing surface and the honeycomb core.

[0005] If the drawing surface is broken, the liquid sealed in the cell may leak to the outside and stain the clothes, or may be accidentally put into the mouth, swallowed, or caught in the eyes. Washing is troublesome because the plastic dispersion liquid attached to clothes is difficult to fall off, but metal magnetic particles are mixed in the dispersion liquid, which may damage the gastrointestinal tract and the like of infants. When entering, there is a risk of rubbing the eyes unintentionally and damaging the surface of the eyes. Furthermore, if the damaged portion of the drawing surface has sharp corners, the body such as hands and arms may be damaged. Since most magnetic display panels are intended for use by infants, thorough measures are required for the safety of internal organs and the body, but conventional ones have not always been sufficient.

Further, even if the drawing surface is not broken, a part of the drawing surface is deformed by the impact, so that the bonding portion between the relatively hard vinyl chloride drawing surface and the honeycomb core is destroyed, and the adjacent cells are broken. Communication may occur at the destroyed part. In this case, as shown in FIG.
A phenomenon occurs in which the plastic dispersion liquid 21 enclosed in the cell 0 leaks from the communicating portion due to deformation of the drawing surface and flows into the adjacent cell 20. By the way, the plastic dispersion liquid 2 is contained in the honeycomb core.
When pouring 1, a part of the air mixes and remains as bubbles in the liquid. Large bubbles burst during stirring and are released into the atmosphere. However, since the plastic dispersion liquid 21 itself is an emulsion, the minute bubbles 22 remain in the dispersion liquid. When the magnetic display panel is used in a state in which the partition walls 23 of the adjacent cells are broken, when the magnetic pen is slid on both cells 20, the internal pressure changes when the writing pressure is applied to both cells 20, and the magnetic plate By strongly moving the liquid, the plastic dispersion liquid inside the adjacent cells 20 comes in and out, and as shown in FIG. 3B, minute bubbles 22 existing in the plastic dispersion liquid 21 in both cells 20 flow. Because they collide and gather in the room, they grow larger. When the bubble 22 grows and grows, it rises above the plastic dispersion liquid 21 and adheres to the back side of the drawing surface. In such a state, even if the magnetic particles 24 are floated by rubbing with a magnetic pen, the large bubbles 22 hinder the magnetic particles 24 from floating to the back side of the drawing surface. For this reason, the magnetic particles cannot be visually recognized from the drawing surface or are difficult to visually recognize, and the displayed drawing lines become unclear.

Further, in the conventional magnetic image plate, since the substrate, the drawing surface, and the honeycomb core are all made of vinyl chloride as described above, static electricity is easily generated. Especially in winter when the air is dry, static electricity is likely to be charged. When the static electricity is charged, the magnetic particles are attracted to the substrate or the drawing surface plate, and the magnetic particles are hard to flow even by the magnetic force of the magnetic pen, so that the drawn lines may be uneven in brightness or dark, or the lines themselves may not appear. For this reason, the eraser must be moved largely left and right before use to keep the magnetic particles in a state where they can easily flow, which is troublesome to handle.

In addition, a honeycomb core made of vinyl chloride has a relatively thick end face of each cell, and a honeycomb shape appears on the drawing surface due to reflection of external light. Therefore, not only the drawing area is reduced, but also free drawing may be impaired.

[0009] In addition, when vinyl chloride magnetic display panels are incinerated at a low temperature at the time of disposal, toxic dioxins are generated, and although research is ongoing, it is suspected that they are environmental hormones. It is said to be a certain substance. In particular, the magnetic plate is mainly intended for use by infants, and it must be safe and not harmful when discarded. For this reason, measures for safely disposing of the magnetic plate are required.

[0010] The present invention solves the above problems,
In view of the fact that this type of magnetic display panel is used almost exclusively by infants, it was established with the primary purpose of reducing the risk of harm to the infant's body and being safe. However, even if the drawing surface of the magnetic drawing board is strongly struck with the tip of the magnetic pen, the drawing surface is unlikely to be damaged, and the adhesion between the drawing surface and the honeycomb core is not easily broken. It is an object of the present invention to provide a composite magnetic display panel for infants that can display clear drawing lines at all times and that can be safely disposed of without causing pollution even when it becomes unnecessary.

[0011]

In order to solve the above-mentioned problems, a composite magnetic display panel for an infant according to the present invention has the following features. (B) A core block having a large number of cells filled with a plastic dispersion liquid containing magnetic particles is adhesively bonded between a core housing body having a raised peripheral portion and a concave portion formed inside and a face plate covering the concave portion. Sealed by. (B) The core housing or the face plate corresponding to the drawing surface is made transparent or translucent, and the core housing and the face plate are each made of an olefin-based synthetic resin. (C) The core block is made of pulp raw paper.

3. The composite magnetic display panel according to claim 1, wherein said core block is made of glassine paper.

Further, the core block may be made of parchment paper.

Further, the core housing may be made of a material selected from polyethylene, polyethylene terephthalate and polypropylene.

Similarly, the adhesive is a vinyl acetate resin,
An acrylic or ultraviolet curable adhesive may be selected.

Furthermore, it is preferable that the upper end of the recess of the core housing is slightly higher than the upper end of the core block .

Furthermore, the recess of the core housing and the above
The dimensional difference at the upper end of the core block is preferably larger than 0 and 0.1 mm or less.

It is preferable that the colorant contained in the plastic dispersion liquid of the core housing and the face plate core block has a similar color to that of the core block.

[0019]

FIG. 1 is a perspective view of a composite magnetic display panel 1 according to the present invention, FIG. 2 is a sectional view thereof, and FIG. 3 is an exploded perspective view showing a face plate 2 and a core housing 3. A honeycomb core 5 having a large number of cells 4 is sealed between them, and a plastic dispersion liquid 7 containing magnetic particles is sealed inside each cell 4 of the honeycomb core 5.

In the above configuration, a magnetic pen (not shown)
Is brought into contact with the drawing surface (the surface of the core housing 3), or by moving an eraser (not shown) slidably disposed on the back side of the face plate 2 to the left and right, thereby forming the plastic dispersion liquid 7. By applying a magnetic field, the magnetic particles can be floated on the drawing surface or settled away from the drawing surface to display or erase pictures and characters on the drawing surface.

The core housing 3 constitutes a drawing surface.
Transparent or translucent olefin-based synthetic resin such as PET
A core 8 is made of a polyethylene-based synthetic resin such as polyethylene or a polypropylene-based synthetic resin such as polypropylene. As shown in FIG. Such a shape can be obtained by ordinary vacuum molding. In addition, it is preferable that the core housing 3 is usually made of a material selected from polyethylene, polyethylene terephthalate, polypropylene, and polybutene.

Next, the honeycomb core 5 has a honeycomb structure having a large number of independent cells 4 and is a water-resistant and oil-resistant paper member. Usually, it is preferable to use glassine paper (for example, "Glasin (trade name)" and "Chrislap (trademark)" manufactured by Oji Paper). Glassine paper is made from carefully selected pulp and is characterized by high transparency. In addition, the thickness can be reduced to about 30 to 40 μ, which is half the thickness (about 60 μ) of the conventional honeycomb core made of vinyl chloride. Other features include high resistance to oils and fats, and exceptionally high strength and tensile strength.

Examples of the glassine paper include "Glasin (trade name)" and "Chrislap (trademark)" manufactured by Oji Paper.
Is appropriate. And the weight of glassine paper is
Those having a range of 25 to 50 g / m ² are suitable. The reason is 25
If it is g / m ² or less, the thickness becomes less 25.mu., insufficient overall strength, the strength When it is 50 g / m ² or more is sufficient, because transparency and thickness resulting in up to the drawing plane It has the disadvantage of appearing. The best one is 35.5 ± 2.0 〜4
1.0 ± 2.0 g / m ² .

The physical properties of glassine paper are shown below.

[Table 1]

Note that parchment paper having similar characteristics may be used. In this case, those with 30.0 ± 60.0 g / m ² are suitable, but those with 35.0 ± 45.0 g / m ² are most suitable.

As shown in FIG. 4 (a), for example, as shown in FIG. 4 (a), an adhesive 11 is applied to each of the front and back surfaces of a large number of strip-shaped paper sheets 9 at regular intervals.
As shown in (b), the two pieces of paper 9a of the same size are sandwiched and polymerized, and the strips of paper that have been polymerized by heating, pressing, etc. are adhered to each other. It can be obtained by pulling out and expanding in the direction of the back.

In the case of glassine paper, the adhesive 11
For example, a mixture of 49 to 51% of ethyl acetate and 49 to 51% of a urethane resin is used as a main agent, and a mixture of 75% of a polyisocyanate prepolymer and ethyl acetate is used as a curing agent. What is necessary is just to use the thing of 2 liquid mixture type which mixed 10 parts.

Further , as shown in FIG. 5 (a), an adhesive 11 is applied to the front and back surfaces of a large number of paper sheets 10 alternately at regular intervals in a strip shape. ), Two sheets of the same size are sandwiched between two paper sheets 10a and polymerized by heating, pressing, and the like, and then bonded together. Then, as shown in FIG. It can also be obtained by cutting like a line P with a predetermined width in a direction perpendicular to the direction, and pulling out the cut one in the same direction as described above and expanding it. Of course, other configurations may be used.

The size of each cell 4 of the honeycomb core 5 is usually preferably set to a degree that is inscribed in a circle of the maximum width 2.0 to 8.0 mm. It is technically difficult to form a paper with a maximum width of 2.0 mm or less on paper, and it is not necessary to have a fine drawing for drawing for infants. It is difficult to control the rise and the settling of all the magnetic particles in 4, and there is a possibility that the drawing may be uneven. The optimal value is between 3.0 and 4.0 mm. The thickness of the honeycomb core 5 is related to the height of the concave portion 8 of the core housing 3, and will be described later.

[0030] Incidentally, the upper end of the recess 8 of the core housing body 3 may be formed to be the same as the upper end portion of the honeycomb core 5, but for the reasons described below, the recess 8 of the core housing body 3
Is formed to be slightly higher than the upper end of the honeycomb core 5.

The face plate 2 is also made of an olefin-based synthetic resin. When the face plate 2 is used as a drawing surface, it is made transparent or translucent.

Next, the opening end surface of the front and back surfaces of the honeycomb core 5 is glued to the rear surface of the core housing body 3 and the face plate 2, thereby the honeycomb core 5 is sealed between the core housing body 3 and the face plate 2 I have. Further, a milky white plastic dispersion liquid 7 containing magnetic particles is sealed in each cell 4 of the honeycomb core 5.

As the plastic dispersion liquid 7, a magnetic field is applied to the dispersion liquid 7 by bringing the tip of a magnetic pen into contact with the drawing surface or by moving the eraser bar to cause the magnetic particles to float on the drawing surface or to draw the drawing surface. Any device can be used as long as it can be displayed or erased on the drawing surface by sinking so as to separate from it. As such a plastic dispersion liquid, a liquid in which magnetic particles, a fine particle thickener, and a colorant are mixed in a dispersion medium is known.

[0034] As the dispersion medium, e.g., water, polar dispersion medium such as glycols, organic solvents, such as non-polar dispersion medium oils and the like. As the magnetic particles, particles of an oxide magnetic material such as black magnetite, γ-hematite, chromium dioxide, and ferrite, and particles of an alloy-based metallic magnetic material such as iron, cobalt, and nickel may be used. Examples of the fine particle thickener include silicic anhydride, hydrous calcium silicate, hydrous aluminum silicate, silica powder, diatomaceous earth, kaolin, clay, benite, etc. Ultra-fine calcium carbonate,
There are ultra-fine activated calcium carbonate, heavy calcium carbonate, hydrated basic magnesium carbonate, barium sulfate and the like, and further, as a coloring agent, there are white pigments and dyes.

By the way, to encapsulate the plastic dispersion liquid 7 in the interior of each cell 4 of the honeycomb core 5, core housing body 3
The honeycomb core 5 is bonded and fixed thereon, and then the plastic dispersion liquid 7
And then bonding the face plate 2 on the honeycomb core 5.

When the upper end of the recess 8 of the core housing 3 is slightly higher than the upper end of the honeycomb core 5, the recess 8 of the core housing 3 is filled with the plastic dispersion liquid 7 containing magnetic particles. At this time, as shown in FIG.
Reaches the height of the peripheral portion 3a of the recess 8 beyond the upper surface of the honeycomb core 5. Therefore, the face plate 2 is moved in the surface direction of the honeycomb core 5 while pressing the face plate 2 against the honeycomb core 5 by an appropriate scraping means 13 as shown in FIGS. As a result, the excess plastic dispersion liquid 7 is removed from the concave portion 8 with the same effect as the powder scraping, and at the same time, the face plate 2 is pressed and adhered to the upper end surface of each cell 4 of the honeycomb core 5, so that the inside thereof is The plastic dispersion liquid 7 is sealed in each cell 4 of the honeycomb core 5 without air.

[0037] Incidentally, the plastic dispersion liquid 7 above the honeycomb core 5 is provided in order to prevent entering of air when the honeycomb core 5 face plates 2 are bonded, on the other hand, the honeycomb core 5 Is an extra liquid that will not be filled, and if the amount of this extra liquid is too large,
The resistance to the movement of the scraping means 13 at the time of scraping is increased, and the force of the waves when pressed by the scraping means 13 is an element for deforming the shape of the honeycomb core 5. For this reason, since the moving speed of the scraping means 13 must be suppressed, the work cannot be performed quickly. Therefore, it is preferable that the dimensional difference d between the honeycomb core 5 and the upper end of the recess 8 is small. The optimum value is about 0.01 mm, but it is preferably 0.1 mm or less as a value suitable for practical use. Of course, the case where the dimensional difference d is 0 mm is excluded.
It needs to be larger than 0 mm.

[0038] The thickness of the honeycomb core 5 0.5 mm~5.
It is preferably about 0 mm. If the thickness is less than 0.5 mm, the core is stored with the magnetic particles sinking to the bottom of the cell 4.
This is because it is possible to see through from the outside of the body 3 , and if it is larger than 5.0 mm, the magnetic force of the magnetic pen or eraser must be increased more than necessary. The optimal value is 0.8 mm to 2.0 mm
It is. Therefore, the height of the concave portion 8 of the core housing 3 is
This is the sum of the thickness of the honeycomb core 5 and the dimensional difference d.

[0039] Incidentally, to encapsulate the plastic dispersion liquid 7 in the interior of each cell 4 of the honeycomb core 5, core housing body 3
After the honeycomb core 5 is bonded and fixed thereon, the plastic dispersion liquid 5
And then bonding the face plate 2 on the honeycomb core 5.

Further, the width of the peripheral portion 3a of the core housing body 3 it is preferable to keep a little larger. It is the peripheral part
3a is also a margin for the peripheral portion of the face plate 2, so that the adhesive strength between the core housing 3 and the face plate 2 is increased. This is because positioning is easy because no loose play occurs, and drilling for fixing to the display means becomes easy.

Next, sealed manner by leveling is not limited to the above example. For example, as shown in FIG.
The peripheral portion of the core housing 3 may have a two-stage structure, and may be formed to be the same as the upper end of the middle portion 3 b and the upper end of the honeycomb core 5. In this case, the liquid surface of the plastic dispersion liquid 7 containing the magnetic particles is filled up to the upper surface of the upper portion 3c of the honeycomb core 5, and then,
The face plate 2 is put on the upper surface of the honeycomb core 5. At this time, the peripheral edge of the face plate 2 is superimposed on the middle step 3 b of the core housing 3. In this state, as shown in FIG. 2B, by operating the scuffing means 13 in the same manner as described above, the face plate 2 adheres to the honeycomb core 5 and at the same time, the excess plastic dispersion liquid 7 is eliminated. A plastic dispersion liquid 7 is sealed in each cell 4 of the honeycomb core 5.

[0042] As the adhesive for adhering the core housing 3 and the honeycomb core 5, or an acrylic adhesive curable at room temperature, ultraviolet curable adhesive which is cured by irradiation of ultraviolet rays is preferred. It is not preferable to use a thermosetting adhesive because the core housing 3 serving as a drawing surface may be distorted due to heat.

By the way, Koaburo' click to be sealed between the core housing 3 and the face plate 2, the cell 4 is honeycomb Hani
It is not limited to the cam core 5 . For example, the cell 4 is shown in FIG.
(B) or a shape in which the waveforms are alternately continuous as shown in FIG. Further, as shown in FIG. 3C, the shape may be a diamond or a rhombus.

When the core housing 3 and the face plate 2 are made of an olefin-based resin, they are excellent in that they have low water absorption, but they are usually difficult to adhere. Repeated incidents have shown that vinyl acetate, acrylic resin or UV curable adhesives are good. However, among them, it has been found that the use of a vinyl acetate resin-based adhesive improves the adhesiveness to paper. The reason is that since the solidification of the vinyl acetate resin-based adhesive is carried out by the disappearance of the contained solvent, at least one of the adherends needs to be porous, but the honeycomb core 5 is made of paper, and It is presumed that the fibers eliminated the contained solvent.

[0045] As described above, the magnetic display panel 1 having the above configuration, the core housing body 3 and the composite magnetic display panel 1 and the paper complexed constituting the honeycomb core 5 olefin synthetic resin of the face plate 2 At the same time, they are almost exclusively used for infants. Therefore, an infant may strongly hit or hit the drawing surface of the magnetic display panel 1 with the tip of the magnetic pen.

In such a case, the impact of the magnetic pen is transmitted from the core housing 3 constituting the drawing surface to the honeycomb core 5, but the honeycomb core 5 is made of relatively flexible paper. Since the cushioning effect is provided, the impact is flexibly absorbed by the core housing 3 and the honeycomb core 5. As described above, since the composite magnetic display panel 1 is configured to prevent the impact force from being concentrated at one point and absorb the impact force around the point, the core housing 3 is not easily broken. Therefore,
Even if the infant strongly hits or hits the core housing 3 of the magnetic display panel 1 with the tip of the magnetic pen, the plastic dispersion liquid 7 in the honeycomb core 5 leaks out and adheres to clothes, or the infant drinks. It is possible to effectively prevent accidents such as eye contact.

[0047] Further, by making the honeycomb core 5 is made of paper, excellent in workability as compared with the conventional vinyl-made honeycomb core chloride, it is possible to reduce the thickness to about half, each of the honeycomb core 5 The ratio of the cell end face to the drawing surface is reduced. The drawing area increases accordingly. Further, when the area of the end face is reduced, the reflection surface for light from the outside is reduced. Further, as described above, glassine paper is thinner and lighter than ordinary paper, has high transparency, transmits light well, has high oil resistance among papers, and has a plastic dispersion liquid. Impregnation further increases the transparency, making it difficult to see the boundary with the plastic dispersion liquid 7 in adjacent cells. For this reason, the drawing surface is a uniform and integral screen in which the honeycomb shape of the honeycomb core 5 is less likely to appear. Moreover, since the thickness of the honeycomb core 5 is small, the honeycomb core 5 filled with magnetic particles and the core housing 3
When bonding, the magnetic particles hardly enter between the end face of the cell of the honeycomb core 5 and the back face of the core housing 3. Therefore, the drawing efficiency is significantly improved. The same effect is obtained when parchment paper is used.

[0048] Similarly, by a colorant and a honeycomb core 5 that is included in plastic dispersion to the same color (usually white), apparently the cells of the honeycomb core 5 that reflected on the drawing surface is abolished The entire drawing surface can be made the same color.

[0049] Further, deformation is a portion of the core housing body 3 bends curved, not a deformation bends without conventional angle beyond the elastic limit as the core after an impact is applied The housing 3 is restored to the original planar shape by the inherent elasticity, and the honeycomb core 5 is assisted by this restoring force.
The deformed part can easily return to the original shape.

[0050] Furthermore, the honeycomb core 5 may adhesiveness because it is made of paper, it is strongly bonded to the core housing body 3 and the face plate 2 and the honeycomb core 5. For this reason, a shock such as that applied by a normal infant does not cause phenomena such as blurring of the drawn line display or liquid leakage due to communication between the adjacent cells 4, and draws a clear drawn line for a long time. Can be.

In addition, since the honeycomb core 5 is made of paper, it is difficult for static electricity to be charged. Therefore, since the fluidity of the magnetic particles is not hindered by static electricity, a clear and clear line can be drawn smoothly from the beginning.

[0052] Further, consist each core housing body 3 and the face plate 2 of the composite magnetic display panel 1 is an olefin-based synthetic resin, the honeycomb core 5 is composed of paper. Therefore, no dioxin is generated even when incinerated after being unnecessary and disposed of.

The face plate is not necessarily made of an olefin resin, but may be made of a vinyl chloride resin as in the prior art. Vinyl chloride is excellent in terms of good workability and adhesiveness. Even when vinyl chloride is used, since the honeycomb core 5 is made of paper and the core housing is made of an olefin-based synthetic resin, it is environmentally friendly. Can mitigate the effects of

[0054]

According to the first aspect of the present invention, when an infant inadvertently strikes or hits the drawing surface of the magnetic display panel with the tip of the magnetic pen, the impact of the magnetic pen forms the drawing surface. It is transmitted from the core housing to the core block,
Since the core block is made of relatively flexible paper having a cushioning effect, the impact is absorbed by the deformation of the core block, and the possibility that a hole is formed in the drawing surface is small. Therefore, it is possible to effectively prevent accidents in which the plastic dispersion liquid in the core block leaks out and adheres to clothes, or an infant drinks or sees the eyes, and sufficiently secures the safety of the infant's body. Can be.

[0055] Also, when impacted, the core container and the core block has a strong tendency to deform a curved surface shape. Therefore, the original shape is easily restored even after the deformation, and the durability is also improved.

[0056] Furthermore, since the core block is made of paper,
Since the adhesive penetrates into the fibers of the opening end face of the core block and the core block and the core housing are firmly bonded,
Even if there is an impact of a magnetic pen or the like, the adhesion between the core housing and the core block is not easily broken. Therefore, a shock such as that applied by a normal infant does not cause phenomena such as liquid leakage or unclear display, and improves durability.

[0057] Similarly, since the core block is made of paper,
Static electricity is difficult to be charged. Therefore, since the fluidity of the magnetic particles is not hindered by static electricity, a clear line can be drawn smoothly from the beginning.

[0058] Further, by making the core block is made of paper, it is possible to reduce the thickness to approximately half the core block of a conventional steel vinyl chloride, the end surface of the core block is a percentage of the drawing plane Become smaller. The drawing area increases accordingly. In addition, when the area of the end face is reduced, not only the reflection surface for light from the outside is reduced, but also when the magnetic particles and the like are encapsulated in the cells of the core block, they may ride on the end face and the drawing. Hateful. Moreover, since the paper absorbs light well, the end face shape of the core block hardly appears on the drawing surface. Therefore, the drawing efficiency is significantly improved.

In addition, the core housing and the face plate are each made of an olefin-based synthetic resin, and the core block is made of paper. Therefore, even if incinerated after being discarded, no dioxin is generated,
It can be safely disposed of without polluting the environment or harming health.

[0060] Furthermore, according to the invention according to claim 2 or 3, the core block is composed of glassine paper or parchment paper, these papers have high transparency in addition to well transmit light, impregnated plastic dispersion is well Therefore, it is difficult to understand the boundary between the plastic dispersion liquid in the adjacent cells. For this reason, it is difficult for the drawing surface to show the cell shape of the core block,
A homogeneous and integrated screen. In addition, due to the small thickness of the core block, when the core block filled with the magnetic particles is bonded to the core housing, the magnetic particles are unlikely to enter between the end surface of the cell of the core block and the back surface of the core housing. . Therefore, the drawing efficiency is significantly improved.

[0061] Furthermore, according to the invention of claim 4, 5 or 6, wherein the core container are polyethylene, it is possible to select and configure any of PET or polypropylene, high transparency and strength A core housing can be obtained.

Further , according to the invention of claim 7, 8 or 9, the adhesive is a vinyl acetate resin, an acrylic,
All you have to do is select one of the UV curable adhesives,
You have a range of choices.

[0063] Further, according to the invention according to claim 10,
The upper end of the recess of the core housing is formed slightly higher than the upper end of the core block. Therefore,
When manufacturing a composite magnetic display panel, the plastic dispersion liquid is allowed to overflow from each cell of the core block in the core housing, and is cut off when the face plate is bonded onto the core block, so that air is supplied into each cell. It is possible to manufacture a favorable composite magnetic display panel without mixing.

Further , according to the eleventh aspect of the present invention,
The dimensional difference between the recess of the core housing and the upper end of the core block is 0.
Since the thickness is set to 1 mm or less, the work of bonding the face plate to the core block can be quickly performed without air being mixed into each cell of the core block.

Further , according to the twelfth aspect of the present invention,
Since the colorant and the core block are similar colors,
The cells of the core block reflected on the drawing surface can be apparently erased to make the entire drawing surface the same color.

[Brief description of the drawings]

FIG. 1 is a perspective view of a composite magnetic display panel according to the present invention as viewed from the back side.

FIG. 2 is a cross-sectional view of the composite magnetic display panel.

FIG. 3 is an exploded perspective view of the composite magnetic display panel.

FIGS. 4 (a), (b) and (c) are explanatory views of a manufacturing mode of a honeycomb core.

5 (a) and 5 (b) are explanatory views of another embodiment of a honeycomb core in a manufacturing mode.

FIGS. 6 (a), (b), and (c) are explanatory views of a mode of enclosing a plastic dispersion liquid.

FIG. 7 (a) and (b) are explanatory views of the manner of enclosing another plastic dispersion liquid.

FIGS. 8A, 8B, and 8C are plan views of other examples of the core block, respectively.

FIGS. 9 (a) and 9 (b) are explanatory views of a bubble growth mode when the cells of the honeycomb core communicate with each other.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 composite magnetic display panel 2 face plate 3 core housing 4 cell 5 honeycomb core 7 plastic dispersion liquid 8 recess

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-323149 (JP, A) JP-A-7-309096 (JP, A) JP-A-54-14193 (JP, A) 88154 (JP, U) Japanese Utility Model 57-88155 (JP, U) Japanese Utility Model 57-88153 (JP, U) Registered utility model 3051136 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , (DB name) A63H 1/00-37/00 B43L 1/00

Claims (12)

(57) [Claims] 1. A composite magnetic display panel for an infant, characterized by having the following requirements. (B) A core block having a large number of cells filled with a plastic dispersion liquid containing magnetic particles is adhesively bonded between a core housing body having a raised peripheral portion and a concave portion formed inside and a face plate covering the concave portion. Sealed by. (B ) The core housing or the face plate corresponding to the drawing surface is made transparent or translucent, and the core housing and the face plate are each made of an olefin-based synthetic resin. (C) The core block is made of pulp raw paper. 2. The composite magnetic display panel for an infant according to claim 1, wherein said core block is made of glassine paper. 3. The composite magnetic display panel according to claim 1, wherein said core block is made of parchment paper. 4. The composite magnetic display panel for an infant according to claim 1, wherein said core housing is made of polyethylene terephthalate. 5. The composite magnetic display panel for an infant according to claim 1, wherein said core housing is made of polyethylene. 6. The composite magnetic display panel for an infant according to claim 1, wherein said core housing is made of polypropylene. 7. The composite magnetic display panel for an infant according to claim 1, wherein said adhesive is made of a material selected from a vinyl acetate resin-based adhesive. 8. The composite magnetic display panel for an infant according to claim 1, wherein said adhesive is made of a material selected from acrylic adhesives. 9. The composite magnetic display panel for an infant according to claim 1, wherein said adhesive is made of a material selected from an ultraviolet curable adhesive. 10. The honeycomb core according to claim 1, wherein the upper end of the recess is slightly higher than the upper end of the honeycomb core.
A composite magnetic display panel for an infant as described in the above. 11. The composite magnetic display panel for an infant according to claim 1, wherein a dimensional difference between the concave portion of the core housing and the upper end of the honeycomb core is greater than 0 and 0.1 mm or less. 12. The composite magnetic display panel for an infant according to claim 1, wherein the plastic dispersion liquid of the core housing and the face plate core block contains a colorant similar in color to the core block.